# Copyright (c) 2015 Ansible, Inc.
# All Rights Reserved.

# Python
import copy
import json
import logging
import re
from collections import OrderedDict
from datetime import timedelta

# OAuth2
from oauthlib import oauth2
from oauthlib.common import generate_token

# Jinja
from jinja2 import sandbox, StrictUndefined
from jinja2.exceptions import TemplateSyntaxError, UndefinedError, SecurityError

# Django
from django.conf import settings
from django.contrib.auth import update_session_auth_hash
from django.contrib.auth.models import User
from django.contrib.contenttypes.models import ContentType
from django.core.exceptions import ObjectDoesNotExist, ValidationError as DjangoValidationError
from django.db import models
from django.utils.translation import ugettext_lazy as _
from django.utils.encoding import force_text
from django.utils.text import capfirst
from django.utils.timezone import now
from django.utils.functional import cached_property

# Django REST Framework
from rest_framework.exceptions import ValidationError, PermissionDenied
from rest_framework.relations import ManyRelatedField
from rest_framework import fields
from rest_framework import serializers
from rest_framework import validators
from rest_framework.utils.serializer_helpers import ReturnList

# Django-Polymorphic
from polymorphic.models import PolymorphicModel

# AWX
from awx.main.access import get_user_capabilities
from awx.main.constants import (
    SCHEDULEABLE_PROVIDERS,
    ACTIVE_STATES,
    CENSOR_VALUE,
)
from awx.main.models import (
    ActivityStream, AdHocCommand, AdHocCommandEvent, Credential, CredentialInputSource,
    CredentialType, CustomInventoryScript, Group, Host, Instance,
    InstanceGroup, Inventory, InventorySource, InventoryUpdate,
    InventoryUpdateEvent, Job, JobEvent, JobHostSummary, JobLaunchConfig,
    JobNotificationMixin, JobTemplate, Label, Notification, NotificationTemplate,
    OAuth2AccessToken, OAuth2Application, Organization, Project,
    ProjectUpdate, ProjectUpdateEvent, RefreshToken, Role, Schedule,
    SystemJob, SystemJobEvent, SystemJobTemplate, Team, UnifiedJob,
    UnifiedJobTemplate, WorkflowApproval, WorkflowApprovalTemplate, WorkflowJob,
    WorkflowJobNode, WorkflowJobTemplate, WorkflowJobTemplateNode, StdoutMaxBytesExceeded
)
from awx.main.models.base import VERBOSITY_CHOICES, NEW_JOB_TYPE_CHOICES
from awx.main.models.rbac import (
    get_roles_on_resource, role_summary_fields_generator
)
from awx.main.fields import ImplicitRoleField, JSONBField
from awx.main.utils import (
    get_type_for_model, get_model_for_type,
    camelcase_to_underscore, getattrd, parse_yaml_or_json,
    has_model_field_prefetched, extract_ansible_vars, encrypt_dict,
    prefetch_page_capabilities, get_external_account, truncate_stdout,
)
from awx.main.utils.filters import SmartFilter
from awx.main.utils.named_url_graph import reset_counters
from awx.main.redact import UriCleaner, REPLACE_STR

from awx.main.validators import vars_validate_or_raise

from awx.api.versioning import reverse
from awx.api.fields import (BooleanNullField, CharNullField, ChoiceNullField,
                            VerbatimField, DeprecatedCredentialField)

logger = logging.getLogger('awx.api.serializers')

# Fields that should be summarized regardless of object type.
DEFAULT_SUMMARY_FIELDS = ('id', 'name', 'description')# , 'created_by', 'modified_by')#, 'type')

# Keys are fields (foreign keys) where, if found on an instance, summary info
# should be added to the serialized data.  Values are a tuple of field names on
# the related object to include in the summary data (if the field is present on
# the related object).
SUMMARIZABLE_FK_FIELDS = {
    'organization': DEFAULT_SUMMARY_FIELDS,
    'user': ('id', 'username', 'first_name', 'last_name'),
    'application': ('id', 'name'),
    'team': DEFAULT_SUMMARY_FIELDS,
    'inventory': DEFAULT_SUMMARY_FIELDS + ('has_active_failures',
                                           'total_hosts',
                                           'hosts_with_active_failures',
                                           'total_groups',
                                           'has_inventory_sources',
                                           'total_inventory_sources',
                                           'inventory_sources_with_failures',
                                           'organization_id',
                                           'kind',
                                           'insights_credential_id',),
    'host': DEFAULT_SUMMARY_FIELDS,
    'group': DEFAULT_SUMMARY_FIELDS,
    'project': DEFAULT_SUMMARY_FIELDS + ('status', 'scm_type'),
    'source_project': DEFAULT_SUMMARY_FIELDS + ('status', 'scm_type'),
    'project_update': DEFAULT_SUMMARY_FIELDS + ('status', 'failed',),
    'credential': DEFAULT_SUMMARY_FIELDS + ('kind', 'cloud', 'kubernetes', 'credential_type_id'),
    'job': DEFAULT_SUMMARY_FIELDS + ('status', 'failed', 'elapsed', 'type', 'canceled_on'),
    'job_template': DEFAULT_SUMMARY_FIELDS,
    'workflow_job_template': DEFAULT_SUMMARY_FIELDS,
    'workflow_job': DEFAULT_SUMMARY_FIELDS,
    'workflow_approval_template': DEFAULT_SUMMARY_FIELDS + ('timeout',),
    'workflow_approval': DEFAULT_SUMMARY_FIELDS + ('timeout',),
    'schedule': DEFAULT_SUMMARY_FIELDS + ('next_run',),
    'unified_job_template': DEFAULT_SUMMARY_FIELDS + ('unified_job_type',),
    'last_job': DEFAULT_SUMMARY_FIELDS + ('finished', 'status', 'failed', 'license_error', 'canceled_on'),
    'last_job_host_summary': DEFAULT_SUMMARY_FIELDS + ('failed',),
    'last_update': DEFAULT_SUMMARY_FIELDS + ('status', 'failed', 'license_error'),
    'current_update': DEFAULT_SUMMARY_FIELDS + ('status', 'failed', 'license_error'),
    'current_job': DEFAULT_SUMMARY_FIELDS + ('status', 'failed', 'license_error'),
    'inventory_source': ('source', 'last_updated', 'status'),
    'custom_inventory_script': DEFAULT_SUMMARY_FIELDS,
    'source_script': DEFAULT_SUMMARY_FIELDS,
    'role': ('id', 'role_field'),
    'notification_template': DEFAULT_SUMMARY_FIELDS,
    'instance_group': ('id', 'name', 'controller_id', 'is_containerized'),
    'insights_credential': DEFAULT_SUMMARY_FIELDS,
    'source_credential': DEFAULT_SUMMARY_FIELDS + ('kind', 'cloud', 'credential_type_id'),
    'target_credential': DEFAULT_SUMMARY_FIELDS + ('kind', 'cloud', 'credential_type_id'),
    'webhook_credential': DEFAULT_SUMMARY_FIELDS + ('kind', 'cloud', 'credential_type_id'),
    'approved_or_denied_by': ('id', 'username', 'first_name', 'last_name'),
    'credential_type': DEFAULT_SUMMARY_FIELDS,
}


def reverse_gfk(content_object, request):
    '''
    Computes a reverse for a GenericForeignKey field.

    Returns a dictionary of the form
        { '<type>': reverse(<type detail>) }
    for example
        { 'organization': '/api/v2/organizations/1/' }
    '''
    if content_object is None or not hasattr(content_object, 'get_absolute_url'):
        return {}

    return {
        camelcase_to_underscore(content_object.__class__.__name__): content_object.get_absolute_url(request=request)
    }


class CopySerializer(serializers.Serializer):

    name = serializers.CharField()

    def validate(self, attrs):
        name = attrs.get('name')
        view = self.context.get('view', None)
        obj = view.get_object()
        if name == obj.name:
            raise serializers.ValidationError(_(
                'The original object is already named {}, a copy from'
                ' it cannot have the same name.'.format(name)
            ))
        return attrs


class BaseSerializerMetaclass(serializers.SerializerMetaclass):
    '''
    Custom metaclass to enable attribute inheritance from Meta objects on
    serializer base classes.

    Also allows for inheriting or updating field lists from base class(es):

        class Meta:

            # Inherit all fields from base class.
            fields = ('*',)

            # Inherit all fields from base class and add 'foo'.
            fields = ('*', 'foo')

            # Inherit all fields from base class except 'bar'.
            fields = ('*', '-bar')

            # Define fields as 'foo' and 'bar'; ignore base class fields.
            fields = ('foo', 'bar')

            # Extra field kwargs dicts are also merged from base classes.
            extra_kwargs = {
                'foo': {'required': True},
                'bar': {'read_only': True},
            }

            # If a subclass were to define extra_kwargs as:
            extra_kwargs = {
                'foo': {'required': False, 'default': ''},
                'bar': {'label': 'New Label for Bar'},
            }

            # The resulting value of extra_kwargs would be:
            extra_kwargs = {
                'foo': {'required': False, 'default': ''},
                'bar': {'read_only': True, 'label': 'New Label for Bar'},
            }

            # Extra field kwargs cannot be removed in subclasses, only replaced.

    '''

    @staticmethod
    def _is_list_of_strings(x):
        return isinstance(x, (list, tuple)) and all([isinstance(y, str) for y in x])

    @staticmethod
    def _is_extra_kwargs(x):
        return isinstance(x, dict) and all([isinstance(k, str) and isinstance(v, dict) for k,v in x.items()])

    @classmethod
    def _update_meta(cls, base, meta, other=None):
        for attr in dir(other):
            if attr.startswith('_'):
                continue
            val = getattr(other, attr)
            meta_val = getattr(meta, attr, None)
            # Special handling for lists/tuples of strings (field names).
            if cls._is_list_of_strings(val) and cls._is_list_of_strings(meta_val or []):
                meta_val = meta_val or []
                new_vals = []
                except_vals = []
                if base: # Merge values from all bases.
                    new_vals.extend([x for x in meta_val])
                for v in val:
                    if not base and v == '*': # Inherit all values from previous base(es).
                        new_vals.extend([x for x in meta_val])
                    elif not base and v.startswith('-'): # Except these values.
                        except_vals.append(v[1:])
                    else:
                        new_vals.append(v)
                val = []
                for v in new_vals:
                    if v not in except_vals and v not in val:
                        val.append(v)
                val = tuple(val)
            # Merge extra_kwargs dicts from base classes.
            elif cls._is_extra_kwargs(val) and cls._is_extra_kwargs(meta_val or {}):
                meta_val = meta_val or {}
                new_val = {}
                if base:
                    for k,v in meta_val.items():
                        new_val[k] = copy.deepcopy(v)
                for k,v in val.items():
                    new_val.setdefault(k, {}).update(copy.deepcopy(v))
                val = new_val
            # Any other values are copied in case they are mutable objects.
            else:
                val = copy.deepcopy(val)
            setattr(meta, attr, val)

    def __new__(cls, name, bases, attrs):
        meta = type('Meta', (object,), {})
        for base in bases[::-1]:
            cls._update_meta(base, meta, getattr(base, 'Meta', None))
        cls._update_meta(None, meta, attrs.get('Meta', meta))
        attrs['Meta'] = meta
        return super(BaseSerializerMetaclass, cls).__new__(cls, name, bases, attrs)


class BaseSerializer(serializers.ModelSerializer, metaclass=BaseSerializerMetaclass):

    class Meta:
        fields = ('id', 'type', 'url', 'related', 'summary_fields', 'created',
                  'modified', 'name', 'description')
        summary_fields = ()
        summarizable_fields = ()

    # add the URL and related resources
    type           = serializers.SerializerMethodField()
    url            = serializers.SerializerMethodField()
    related        = serializers.SerializerMethodField('_get_related')
    summary_fields = serializers.SerializerMethodField('_get_summary_fields')

    # make certain fields read only
    created       = serializers.SerializerMethodField()
    modified      = serializers.SerializerMethodField()

    def __init__(self, *args, **kwargs):
        super(BaseSerializer, self).__init__(*args, **kwargs)
        # The following lines fix the problem of being able to pass JSON dict into PrimaryKeyRelatedField.
        data = kwargs.get('data', False)
        if data:
            for field_name, field_instance in self.fields.items():
                if isinstance(field_instance, ManyRelatedField) and not field_instance.read_only:
                    if isinstance(data.get(field_name, False), dict):
                        raise serializers.ValidationError(_('Cannot use dictionary for %s' % field_name))

    @property
    def version(self):
        return 2

    def get_type(self, obj):
        return get_type_for_model(self.Meta.model)

    def get_types(self):
        return [self.get_type(None)]

    def get_type_choices(self):
        type_name_map = {
            'job': _('Playbook Run'),
            'ad_hoc_command': _('Command'),
            'project_update': _('SCM Update'),
            'inventory_update': _('Inventory Sync'),
            'system_job': _('Management Job'),
            'workflow_job': _('Workflow Job'),
            'workflow_job_template': _('Workflow Template'),
            'job_template': _('Job Template')
        }
        choices = []
        for t in self.get_types():
            name = _(type_name_map.get(t, force_text(get_model_for_type(t)._meta.verbose_name).title()))
            choices.append((t, name))
        return choices

    def get_url(self, obj):
        if obj is None or not hasattr(obj, 'get_absolute_url'):
            return ''
        elif isinstance(obj, User):
            return self.reverse('api:user_detail', kwargs={'pk': obj.pk})
        else:
            return obj.get_absolute_url(request=self.context.get('request'))

    def filter_field_metadata(self, fields, method):
        """
        Filter field metadata based on the request method.
        This it intended to be extended by subclasses.
        """
        return fields

    def _get_related(self, obj):
        return {} if obj is None else self.get_related(obj)

    def _generate_named_url(self, url_path, obj, node):
        url_units = url_path.split('/')
        reset_counters()
        named_url = node.generate_named_url(obj)
        url_units[4] = named_url
        return '/'.join(url_units)

    def get_related(self, obj):
        res = OrderedDict()
        view = self.context.get('view', None)
        if view and (hasattr(view, 'retrieve') or view.request.method == 'POST') and \
                type(obj) in settings.NAMED_URL_GRAPH:
            original_url = self.get_url(obj)
            res['named_url'] = self._generate_named_url(
                original_url, obj, settings.NAMED_URL_GRAPH[type(obj)]
            )
        if getattr(obj, 'created_by', None):
            res['created_by'] = self.reverse('api:user_detail', kwargs={'pk': obj.created_by.pk})
        if getattr(obj, 'modified_by', None):
            res['modified_by'] = self.reverse('api:user_detail', kwargs={'pk': obj.modified_by.pk})
        return res

    def _get_summary_fields(self, obj):
        return {} if obj is None else self.get_summary_fields(obj)

    def get_summary_fields(self, obj):
        # Return values for certain fields on related objects, to simplify
        # displaying lists of items without additional API requests.
        summary_fields = OrderedDict()
        for fk, related_fields in SUMMARIZABLE_FK_FIELDS.items():
            try:
                # A few special cases where we don't want to access the field
                # because it results in additional queries.
                if fk == 'job' and isinstance(obj, UnifiedJob):
                    continue
                if fk == 'project' and (isinstance(obj, InventorySource) or
                                        isinstance(obj, Project)):
                    continue

                try:
                    fkval = getattr(obj, fk, None)
                except ObjectDoesNotExist:
                    continue
                if fkval is None:
                    continue
                if fkval == obj:
                    continue
                summary_fields[fk] = OrderedDict()
                for field in related_fields:

                    fval = getattr(fkval, field, None)

                    if fval is None and field == 'type':
                        if isinstance(fkval, PolymorphicModel):
                            fkval = fkval.get_real_instance()
                        fval = get_type_for_model(fkval)
                    elif fval is None and field == 'unified_job_type' and isinstance(fkval, UnifiedJobTemplate):
                        fkval = fkval.get_real_instance()
                        fval = get_type_for_model(fkval._get_unified_job_class())
                    if fval is not None:
                        summary_fields[fk][field] = fval
            # Can be raised by the reverse accessor for a OneToOneField.
            except ObjectDoesNotExist:
                pass
        if getattr(obj, 'created_by', None):
            summary_fields['created_by'] = OrderedDict()
            for field in SUMMARIZABLE_FK_FIELDS['user']:
                summary_fields['created_by'][field] = getattr(obj.created_by, field)
        if getattr(obj, 'modified_by', None):
            summary_fields['modified_by'] = OrderedDict()
            for field in SUMMARIZABLE_FK_FIELDS['user']:
                summary_fields['modified_by'][field] = getattr(obj.modified_by, field)

        # RBAC summary fields
        roles = {}
        for field in obj._meta.get_fields():
            if type(field) is ImplicitRoleField:
                roles[field.name] = role_summary_fields_generator(obj, field.name)
        if len(roles) > 0:
            summary_fields['object_roles'] = roles

        # Advance display of RBAC capabilities
        if hasattr(self, 'show_capabilities'):
            user_capabilities = self._obj_capability_dict(obj)
            if user_capabilities:
                summary_fields['user_capabilities'] = user_capabilities

        return summary_fields

    def _obj_capability_dict(self, obj):
        """
        Returns the user_capabilities dictionary for a single item
        If inside of a list view, it runs the prefetching algorithm for
        the entire current page, saves it into context
        """
        view = self.context.get('view', None)
        parent_obj = None
        if view and hasattr(view, 'parent_model') and hasattr(view, 'get_parent_object'):
            parent_obj = view.get_parent_object()
        if view and view.request and view.request.user:
            capabilities_cache = {}
            # if serializer has parent, it is ListView, apply page capabilities prefetch
            if self.parent and hasattr(self, 'capabilities_prefetch') and self.capabilities_prefetch:
                qs = self.parent.instance
                if 'capability_map' not in self.context:
                    if hasattr(self, 'polymorphic_base'):
                        model = self.polymorphic_base.Meta.model
                        prefetch_list = self.polymorphic_base.capabilities_prefetch
                    else:
                        model = self.Meta.model
                        prefetch_list = self.capabilities_prefetch
                    self.context['capability_map'] = prefetch_page_capabilities(
                        model, qs, prefetch_list, view.request.user
                    )
                if obj.id in self.context['capability_map']:
                    capabilities_cache = self.context['capability_map'][obj.id]
            return get_user_capabilities(
                view.request.user, obj, method_list=self.show_capabilities, parent_obj=parent_obj,
                capabilities_cache=capabilities_cache
            )
        else:
            # Contextual information to produce user_capabilities doesn't exist
            return {}

    def get_created(self, obj):
        if obj is None:
            return None
        elif isinstance(obj, User):
            return obj.date_joined
        elif hasattr(obj, 'created'):
            return obj.created
        return None

    def get_modified(self, obj):
        if obj is None:
            return None
        elif isinstance(obj, User):
            return obj.last_login # Not actually exposed for User.
        elif hasattr(obj, 'modified'):
            return obj.modified
        return None

    def get_extra_kwargs(self):
        extra_kwargs = super(BaseSerializer, self).get_extra_kwargs()
        if self.instance:
            read_only_on_update_fields = getattr(self.Meta, 'read_only_on_update_fields', tuple())
            for field_name in read_only_on_update_fields:
                kwargs = extra_kwargs.get(field_name, {})
                kwargs['read_only'] = True
                extra_kwargs[field_name] = kwargs
        return extra_kwargs

    def build_standard_field(self, field_name, model_field):
        # DRF 3.3 serializers.py::build_standard_field() -> utils/field_mapping.py::get_field_kwargs() short circuits
        # when a Model's editable field is set to False. The short circuit skips choice rendering.
        #
        # This logic is to force rendering choice's on an uneditable field.
        # Note: Consider expanding this rendering for more than just choices fields
        # Note: This logic works in conjuction with
        if hasattr(model_field, 'choices') and model_field.choices:
            was_editable = model_field.editable
            model_field.editable = True

        field_class, field_kwargs = super(BaseSerializer, self).build_standard_field(field_name, model_field)
        if hasattr(model_field, 'choices') and model_field.choices:
            model_field.editable = was_editable
            if was_editable is False:
                field_kwargs['read_only'] = True

        # Pass model field default onto the serializer field if field is not read-only.
        if model_field.has_default() and not field_kwargs.get('read_only', False):
            field_kwargs['default'] = field_kwargs['initial'] = model_field.get_default()

        # Enforce minimum value of 0 for PositiveIntegerFields.
        if isinstance(model_field, (models.PositiveIntegerField, models.PositiveSmallIntegerField)) and 'choices' not in field_kwargs:
            field_kwargs['min_value'] = 0

        # Use custom boolean field that allows null and empty string as False values.
        if isinstance(model_field, models.BooleanField) and not field_kwargs.get('read_only', False):
            field_class = BooleanNullField

        # Use custom char or choice field that coerces null to an empty string.
        if isinstance(model_field, (models.CharField, models.TextField)) and not field_kwargs.get('read_only', False):
            if 'choices' in field_kwargs:
                field_class = ChoiceNullField
            else:
                field_class = CharNullField

        # Update the message used for the unique validator to use capitalized
        # verbose name; keeps unique message the same as with DRF 2.x.
        opts = self.Meta.model._meta.concrete_model._meta
        for validator in field_kwargs.get('validators', []):
            if isinstance(validator, validators.UniqueValidator):
                unique_error_message = model_field.error_messages.get('unique', None)
                if unique_error_message:
                    unique_error_message = unique_error_message % {
                        'model_name': capfirst(opts.verbose_name),
                        'field_label': capfirst(model_field.verbose_name),
                    }
                    validator.message = unique_error_message

        return field_class, field_kwargs

    def build_relational_field(self, field_name, relation_info):
        field_class, field_kwargs = super(BaseSerializer, self).build_relational_field(field_name, relation_info)
        # Don't include choices for foreign key fields.
        field_kwargs.pop('choices', None)
        return field_class, field_kwargs

    def get_unique_together_validators(self):
        # Allow the model's full_clean method to handle the unique together validation.
        return []

    def run_validation(self, data=fields.empty):
        try:
            return super(BaseSerializer, self).run_validation(data)
        except ValidationError as exc:
            # Avoid bug? in DRF if exc.detail happens to be a list instead of a dict.
            raise ValidationError(detail=serializers.as_serializer_error(exc))

    def get_validation_exclusions(self, obj=None):
        # Borrowed from DRF 2.x - return model fields that should be excluded
        # from model validation.
        cls = self.Meta.model
        opts = cls._meta.concrete_model._meta
        exclusions = [field.name for field in opts.fields]
        for field_name, field in self.fields.items():
            field_name = field.source or field_name
            if field_name not in exclusions:
                continue
            if field.read_only:
                continue
            if isinstance(field, serializers.Serializer):
                continue
            exclusions.remove(field_name)
        # The clean_ methods cannot be ran on many-to-many models
        exclusions.extend([field.name for field in opts.many_to_many])
        return exclusions

    def validate(self, attrs):
        attrs = super(BaseSerializer, self).validate(attrs)
        try:
            # Create/update a model instance and run it's full_clean() method to
            # do any validation implemented on the model class.
            exclusions = self.get_validation_exclusions(self.instance)
            obj = self.instance or self.Meta.model()
            for k,v in attrs.items():
                if k not in exclusions:
                    setattr(obj, k, v)
            obj.full_clean(exclude=exclusions)
            # full_clean may modify values on the instance; copy those changes
            # back to attrs so they are saved.
            for k in attrs.keys():
                if k not in exclusions:
                    attrs[k] = getattr(obj, k)
        except DjangoValidationError as exc:
            # DjangoValidationError may contain a list or dict; normalize into a
            # dict where the keys are the field name and the values are a list
            # of error messages, then raise as a DRF ValidationError.  DRF would
            # normally convert any DjangoValidationError to a non-field specific
            # error message; here we preserve field-specific errors raised from
            # the model's full_clean method.
            d = exc.update_error_dict({})
            for k,v in d.items():
                v = v if isinstance(v, list) else [v]
                v2 = []
                for e in v:
                    if isinstance(e, DjangoValidationError):
                        v2.extend(list(e))
                    elif isinstance(e, list):
                        v2.extend(e)
                    else:
                        v2.append(e)
                d[k] = list(map(force_text, v2))
            raise ValidationError(d)
        return attrs

    def reverse(self, *args, **kwargs):
        kwargs['request'] = self.context.get('request')
        return reverse(*args, **kwargs)

    @property
    def is_detail_view(self):
        if 'view' in self.context:
            if 'pk' in self.context['view'].kwargs:
                return True
        return False


class EmptySerializer(serializers.Serializer):
    pass


class UnifiedJobTemplateSerializer(BaseSerializer):
    # As a base serializer, the capabilities prefetch is not used directly,
    # instead they are derived from the Workflow Job Template Serializer and the Job Template Serializer, respectively.
    capabilities_prefetch = []

    class Meta:
        model = UnifiedJobTemplate
        fields = ('*', 'last_job_run', 'last_job_failed',
                  'next_job_run', 'status')

    def get_related(self, obj):
        res = super(UnifiedJobTemplateSerializer, self).get_related(obj)
        if obj.current_job:
            res['current_job'] = obj.current_job.get_absolute_url(request=self.context.get('request'))
        if obj.last_job:
            res['last_job'] = obj.last_job.get_absolute_url(request=self.context.get('request'))
        if obj.next_schedule:
            res['next_schedule'] = obj.next_schedule.get_absolute_url(request=self.context.get('request'))
        return res

    def get_types(self):
        if type(self) is UnifiedJobTemplateSerializer:
            return ['project', 'inventory_source', 'job_template', 'system_job_template', 'workflow_job_template',]
        else:
            return super(UnifiedJobTemplateSerializer, self).get_types()

    def get_sub_serializer(self, obj):
        serializer_class = None
        if type(self) is UnifiedJobTemplateSerializer:
            if isinstance(obj, Project):
                serializer_class = ProjectSerializer
            elif isinstance(obj, InventorySource):
                serializer_class = InventorySourceSerializer
            elif isinstance(obj, JobTemplate):
                serializer_class = JobTemplateSerializer
            elif isinstance(obj, SystemJobTemplate):
                serializer_class = SystemJobTemplateSerializer
            elif isinstance(obj, WorkflowJobTemplate):
                serializer_class = WorkflowJobTemplateSerializer
            elif isinstance(obj, WorkflowApprovalTemplate):
                serializer_class = WorkflowApprovalTemplateSerializer
        return serializer_class

    def to_representation(self, obj):
        serializer_class = self.get_sub_serializer(obj)
        if serializer_class:
            serializer = serializer_class(instance=obj, context=self.context)
            # preserve links for list view
            if self.parent:
                serializer.parent = self.parent
                serializer.polymorphic_base = self
                # capabilities prefetch is only valid for these models
                if isinstance(obj, (JobTemplate, WorkflowJobTemplate)):
                    serializer.capabilities_prefetch = serializer_class.capabilities_prefetch
                else:
                    serializer.capabilities_prefetch = None
            return serializer.to_representation(obj)
        else:
            return super(UnifiedJobTemplateSerializer, self).to_representation(obj)


class UnifiedJobSerializer(BaseSerializer):
    show_capabilities = ['start', 'delete']
    event_processing_finished = serializers.BooleanField(
        help_text=_('Indicates whether all of the events generated by this '
                    'unified job have been saved to the database.'),
        read_only=True
    )

    class Meta:
        model = UnifiedJob
        fields = ('*', 'unified_job_template', 'launch_type', 'status',
                  'failed', 'started', 'finished', 'canceled_on', 'elapsed', 'job_args',
                  'job_cwd', 'job_env', 'job_explanation',
                  'execution_node', 'controller_node',
                  'result_traceback', 'event_processing_finished')
        extra_kwargs = {
            'unified_job_template': {
                'source': 'unified_job_template_id',
                'label': 'unified job template',
            },
            'job_env': {
                'read_only': True,
                'label': 'job_env',
            }
        }

    def get_types(self):
        if type(self) is UnifiedJobSerializer:
            return ['project_update', 'inventory_update', 'job', 'ad_hoc_command', 'system_job', 'workflow_job',]
        else:
            return super(UnifiedJobSerializer, self).get_types()

    def get_related(self, obj):
        res = super(UnifiedJobSerializer, self).get_related(obj)
        if obj.unified_job_template:
            res['unified_job_template'] = obj.unified_job_template.get_absolute_url(request=self.context.get('request'))
        if obj.schedule:
            res['schedule'] = obj.schedule.get_absolute_url(request=self.context.get('request'))
        if isinstance(obj, ProjectUpdate):
            res['stdout'] = self.reverse('api:project_update_stdout', kwargs={'pk': obj.pk})
        elif isinstance(obj, InventoryUpdate):
            res['stdout'] = self.reverse('api:inventory_update_stdout', kwargs={'pk': obj.pk})
        elif isinstance(obj, Job):
            res['stdout'] = self.reverse('api:job_stdout', kwargs={'pk': obj.pk})
        elif isinstance(obj, AdHocCommand):
            res['stdout'] = self.reverse('api:ad_hoc_command_stdout', kwargs={'pk': obj.pk})
        if obj.workflow_job_id:
            res['source_workflow_job'] = self.reverse('api:workflow_job_detail', kwargs={'pk': obj.workflow_job_id})
        return res

    def get_summary_fields(self, obj):
        summary_fields = super(UnifiedJobSerializer, self).get_summary_fields(obj)
        if obj.spawned_by_workflow:
            summary_fields['source_workflow_job'] = {}
            try:
                summary_obj = obj.unified_job_node.workflow_job
            except UnifiedJob.unified_job_node.RelatedObjectDoesNotExist:
                return summary_fields

            for field in SUMMARIZABLE_FK_FIELDS['job']:
                val = getattr(summary_obj, field, None)
                if val is not None:
                    summary_fields['source_workflow_job'][field] = val

        return summary_fields

    def get_sub_serializer(self, obj):
        serializer_class = None
        if type(self) is UnifiedJobSerializer:
            if isinstance(obj, ProjectUpdate):
                serializer_class = ProjectUpdateSerializer
            elif isinstance(obj, InventoryUpdate):
                serializer_class = InventoryUpdateSerializer
            elif isinstance(obj, Job):
                serializer_class = JobSerializer
            elif isinstance(obj, AdHocCommand):
                serializer_class = AdHocCommandSerializer
            elif isinstance(obj, SystemJob):
                serializer_class = SystemJobSerializer
            elif isinstance(obj, WorkflowJob):
                serializer_class = WorkflowJobSerializer
            elif isinstance(obj, WorkflowApproval):
                serializer_class = WorkflowApprovalSerializer
        return serializer_class

    def to_representation(self, obj):
        serializer_class = self.get_sub_serializer(obj)
        if serializer_class:
            serializer = serializer_class(instance=obj, context=self.context)
            # preserve links for list view
            if self.parent:
                serializer.parent = self.parent
                serializer.polymorphic_base = self
                # TODO: restrict models for capabilities prefetch, when it is added
            ret = serializer.to_representation(obj)
        else:
            ret = super(UnifiedJobSerializer, self).to_representation(obj)

        if 'elapsed' in ret:
            if obj and obj.pk and obj.started and not obj.finished:
                td = now() - obj.started
                ret['elapsed'] = (td.microseconds + (td.seconds + td.days * 24 * 3600) * 10 ** 6) / (10 ** 6 * 1.0)
            ret['elapsed'] = float(ret['elapsed'])
        # Because this string is saved in the db in the source language,
        # it must be marked for translation after it is pulled from the db, not when set
        ret['job_explanation'] = _(obj.job_explanation)
        return ret


class UnifiedJobListSerializer(UnifiedJobSerializer):

    class Meta:
        fields = ('*', '-job_args', '-job_cwd', '-job_env', '-result_traceback', '-event_processing_finished')

    def get_field_names(self, declared_fields, info):
        field_names = super(UnifiedJobListSerializer, self).get_field_names(declared_fields, info)
        # Meta multiple inheritance and -field_name options don't seem to be
        # taking effect above, so remove the undesired fields here.
        return tuple(x for x in field_names if x not in ('job_args', 'job_cwd', 'job_env', 'result_traceback', 'event_processing_finished'))

    def get_types(self):
        if type(self) is UnifiedJobListSerializer:
            return ['project_update', 'inventory_update', 'job', 'ad_hoc_command', 'system_job', 'workflow_job']
        else:
            return super(UnifiedJobListSerializer, self).get_types()

    def get_sub_serializer(self, obj):
        serializer_class = None
        if type(self) is UnifiedJobListSerializer:
            if isinstance(obj, ProjectUpdate):
                serializer_class = ProjectUpdateListSerializer
            elif isinstance(obj, InventoryUpdate):
                serializer_class = InventoryUpdateListSerializer
            elif isinstance(obj, Job):
                serializer_class = JobListSerializer
            elif isinstance(obj, AdHocCommand):
                serializer_class = AdHocCommandListSerializer
            elif isinstance(obj, SystemJob):
                serializer_class = SystemJobListSerializer
            elif isinstance(obj, WorkflowJob):
                serializer_class = WorkflowJobListSerializer
            elif isinstance(obj, WorkflowApproval):
                serializer_class = WorkflowApprovalListSerializer
        return serializer_class

    def to_representation(self, obj):
        serializer_class = self.get_sub_serializer(obj)
        if serializer_class:
            serializer = serializer_class(instance=obj, context=self.context)
            ret = serializer.to_representation(obj)
        else:
            ret = super(UnifiedJobListSerializer, self).to_representation(obj)
        if 'elapsed' in ret:
            ret['elapsed'] = float(ret['elapsed'])
        return ret


class UnifiedJobStdoutSerializer(UnifiedJobSerializer):

    result_stdout = serializers.SerializerMethodField()

    class Meta:
        fields = ('result_stdout',)

    def get_types(self):
        if type(self) is UnifiedJobStdoutSerializer:
            return ['project_update', 'inventory_update', 'job', 'ad_hoc_command', 'system_job']
        else:
            return super(UnifiedJobStdoutSerializer, self).get_types()


class UserSerializer(BaseSerializer):

    password = serializers.CharField(required=False, default='', write_only=True,
                                     help_text=_('Write-only field used to change the password.'))
    ldap_dn = serializers.CharField(source='profile.ldap_dn', read_only=True)
    external_account = serializers.SerializerMethodField(help_text=_('Set if the account is managed by an external service'))
    is_system_auditor = serializers.BooleanField(default=False)
    show_capabilities = ['edit', 'delete']

    class Meta:
        model = User
        fields = ('*', '-name', '-description', '-modified',
                  'username', 'first_name', 'last_name',
                  'email', 'is_superuser', 'is_system_auditor', 'password', 'ldap_dn', 'last_login', 'external_account')
        extra_kwargs = {
            'last_login': {'read_only': True}
        }

    def to_representation(self, obj):
        ret = super(UserSerializer, self).to_representation(obj)
        ret.pop('password', None)
        if obj and type(self) is UserSerializer:
            ret['auth'] = obj.social_auth.values('provider', 'uid')
        return ret

    def get_validation_exclusions(self, obj=None):
        ret = super(UserSerializer, self).get_validation_exclusions(obj)
        ret.extend(['password', 'is_system_auditor'])
        return ret

    def validate_password(self, value):
        if not self.instance and value in (None, ''):
            raise serializers.ValidationError(_('Password required for new User.'))
        return value

    def _update_password(self, obj, new_password):
        # For now we're not raising an error, just not saving password for
        # users managed by LDAP who already have an unusable password set.
        if getattr(settings, 'AUTH_LDAP_SERVER_URI', None):
            try:
                if obj.pk and obj.profile.ldap_dn and not obj.has_usable_password():
                    new_password = None
            except AttributeError:
                pass
        if (getattr(settings, 'SOCIAL_AUTH_GOOGLE_OAUTH2_KEY', None) or
                getattr(settings, 'SOCIAL_AUTH_GITHUB_KEY', None) or
                getattr(settings, 'SOCIAL_AUTH_GITHUB_ORG_KEY', None) or
                getattr(settings, 'SOCIAL_AUTH_GITHUB_TEAM_KEY', None) or
                getattr(settings, 'SOCIAL_AUTH_SAML_ENABLED_IDPS', None)) and obj.social_auth.all():
            new_password = None
        if (getattr(settings, 'RADIUS_SERVER', None) or
                getattr(settings, 'TACACSPLUS_HOST', None)) and obj.enterprise_auth.all():
            new_password = None
        if new_password:
            obj.set_password(new_password)
            obj.save(update_fields=['password'])

            # Cycle the session key, but if the requesting user is the same
            # as the modified user then inject a session key derived from
            # the updated user to prevent logout. This is the logic used by
            # the Django admin's own user_change_password view.
            update_session_auth_hash(self.context['request'], obj)
        elif not obj.password:
            obj.set_unusable_password()
            obj.save(update_fields=['password'])

    def get_external_account(self, obj):
        return get_external_account(obj)

    def create(self, validated_data):
        new_password = validated_data.pop('password', None)
        is_system_auditor = validated_data.pop('is_system_auditor', None)
        obj = super(UserSerializer, self).create(validated_data)
        self._update_password(obj, new_password)
        if is_system_auditor is not None:
            obj.is_system_auditor = is_system_auditor
        return obj

    def update(self, obj, validated_data):
        new_password = validated_data.pop('password', None)
        is_system_auditor = validated_data.pop('is_system_auditor', None)
        obj = super(UserSerializer, self).update(obj, validated_data)
        self._update_password(obj, new_password)
        if is_system_auditor is not None:
            obj.is_system_auditor = is_system_auditor
        return obj

    def get_related(self, obj):
        res = super(UserSerializer, self).get_related(obj)
        res.update(dict(
            teams                  = self.reverse('api:user_teams_list',                  kwargs={'pk': obj.pk}),
            organizations          = self.reverse('api:user_organizations_list',          kwargs={'pk': obj.pk}),
            admin_of_organizations = self.reverse('api:user_admin_of_organizations_list', kwargs={'pk': obj.pk}),
            projects               = self.reverse('api:user_projects_list',               kwargs={'pk': obj.pk}),
            credentials            = self.reverse('api:user_credentials_list',            kwargs={'pk': obj.pk}),
            roles                  = self.reverse('api:user_roles_list',                  kwargs={'pk': obj.pk}),
            activity_stream        = self.reverse('api:user_activity_stream_list',        kwargs={'pk': obj.pk}),
            access_list            = self.reverse('api:user_access_list',                 kwargs={'pk': obj.pk}),
            tokens                 = self.reverse('api:o_auth2_token_list',         kwargs={'pk': obj.pk}),
            authorized_tokens      = self.reverse('api:user_authorized_token_list', kwargs={'pk': obj.pk}),
            personal_tokens        = self.reverse('api:user_personal_token_list',   kwargs={'pk': obj.pk}),
        ))
        return res

    def _validate_ldap_managed_field(self, value, field_name):
        if not getattr(settings, 'AUTH_LDAP_SERVER_URI', None):
            return value
        try:
            is_ldap_user = bool(self.instance and self.instance.profile.ldap_dn)
        except AttributeError:
            is_ldap_user = False
        if is_ldap_user:
            ldap_managed_fields = ['username']
            ldap_managed_fields.extend(getattr(settings, 'AUTH_LDAP_USER_ATTR_MAP', {}).keys())
            ldap_managed_fields.extend(getattr(settings, 'AUTH_LDAP_USER_FLAGS_BY_GROUP', {}).keys())
            if field_name in ldap_managed_fields:
                if value != getattr(self.instance, field_name):
                    raise serializers.ValidationError(_('Unable to change %s on user managed by LDAP.') % field_name)
        return value

    def validate_username(self, value):
        return self._validate_ldap_managed_field(value, 'username')

    def validate_first_name(self, value):
        return self._validate_ldap_managed_field(value, 'first_name')

    def validate_last_name(self, value):
        return self._validate_ldap_managed_field(value, 'last_name')

    def validate_email(self, value):
        return self._validate_ldap_managed_field(value, 'email')

    def validate_is_superuser(self, value):
        return self._validate_ldap_managed_field(value, 'is_superuser')


class UserActivityStreamSerializer(UserSerializer):
    """Changes to system auditor status are shown as separate entries,
    so by excluding it from fields here we avoid duplication, which
    would carry some unintended consequences.
    """
    class Meta:
        model = User
        fields = ('*', '-is_system_auditor')


class BaseOAuth2TokenSerializer(BaseSerializer):

    refresh_token = serializers.SerializerMethodField()
    token = serializers.SerializerMethodField()
    ALLOWED_SCOPES = ['read', 'write']

    class Meta:
        model = OAuth2AccessToken
        fields = (
            '*', '-name', 'description', 'user', 'token', 'refresh_token',
            'application', 'expires', 'scope',
        )
        read_only_fields = ('user', 'token', 'expires', 'refresh_token')
        extra_kwargs = {
            'scope': {'allow_null': False, 'required': False},
            'user': {'allow_null': False, 'required': True}
        }

    def get_token(self, obj):
        request = self.context.get('request', None)
        try:
            if request.method == 'POST':
                return obj.token
            else:
                return CENSOR_VALUE
        except ObjectDoesNotExist:
            return ''

    def get_refresh_token(self, obj):
        request = self.context.get('request', None)
        try:
            if not obj.refresh_token:
                return None
            elif request.method == 'POST':
                return getattr(obj.refresh_token, 'token', '')
            else:
                return CENSOR_VALUE
        except ObjectDoesNotExist:
            return None

    def get_related(self, obj):
        ret = super(BaseOAuth2TokenSerializer, self).get_related(obj)
        if obj.user:
            ret['user'] = self.reverse('api:user_detail', kwargs={'pk': obj.user.pk})
        if obj.application:
            ret['application'] = self.reverse(
                'api:o_auth2_application_detail', kwargs={'pk': obj.application.pk}
            )
        ret['activity_stream'] = self.reverse(
            'api:o_auth2_token_activity_stream_list', kwargs={'pk': obj.pk}
        )
        return ret

    def _is_valid_scope(self, value):
        if not value or (not isinstance(value, str)):
            return False
        words = value.split()
        for word in words:
            if words.count(word) > 1:
                return False  # do not allow duplicates
            if word not in self.ALLOWED_SCOPES:
                return False
        return True

    def validate_scope(self, value):
        if not self._is_valid_scope(value):
            raise serializers.ValidationError(_(
                'Must be a simple space-separated string with allowed scopes {}.'
            ).format(self.ALLOWED_SCOPES))
        return value

    def create(self, validated_data):
        validated_data['user'] = self.context['request'].user
        try:
            return super(BaseOAuth2TokenSerializer, self).create(validated_data)
        except oauth2.AccessDeniedError as e:
            raise PermissionDenied(str(e))


class UserAuthorizedTokenSerializer(BaseOAuth2TokenSerializer):

    class Meta:
        extra_kwargs = {
            'scope': {'allow_null': False, 'required': False},
            'user': {'allow_null': False, 'required': True},
            'application': {'allow_null': False, 'required': True}
        }

    def create(self, validated_data):
        current_user = self.context['request'].user
        validated_data['token'] = generate_token()
        validated_data['expires'] = now() + timedelta(
            seconds=settings.OAUTH2_PROVIDER['ACCESS_TOKEN_EXPIRE_SECONDS']
        )
        obj = super(UserAuthorizedTokenSerializer, self).create(validated_data)
        obj.save()
        if obj.application:
            RefreshToken.objects.create(
                user=current_user,
                token=generate_token(),
                application=obj.application,
                access_token=obj
            )
        return obj


class OAuth2TokenSerializer(BaseOAuth2TokenSerializer):

    def create(self, validated_data):
        current_user = self.context['request'].user
        validated_data['token'] = generate_token()
        validated_data['expires'] = now() + timedelta(
            seconds=settings.OAUTH2_PROVIDER['ACCESS_TOKEN_EXPIRE_SECONDS']
        )
        obj = super(OAuth2TokenSerializer, self).create(validated_data)
        if obj.application and obj.application.user:
            obj.user = obj.application.user
        obj.save()
        if obj.application:
            RefreshToken.objects.create(
                user=current_user,
                token=generate_token(),
                application=obj.application,
                access_token=obj
            )
        return obj


class OAuth2TokenDetailSerializer(OAuth2TokenSerializer):

    class Meta:
        read_only_fields = ('*', 'user', 'application')


class UserPersonalTokenSerializer(BaseOAuth2TokenSerializer):

    class Meta:
        read_only_fields = ('user', 'token', 'expires', 'application')

    def create(self, validated_data):
        validated_data['token'] = generate_token()
        validated_data['expires'] = now() + timedelta(
            seconds=settings.OAUTH2_PROVIDER['ACCESS_TOKEN_EXPIRE_SECONDS']
        )
        validated_data['application'] = None
        obj = super(UserPersonalTokenSerializer, self).create(validated_data)
        obj.save()
        return obj


class OAuth2ApplicationSerializer(BaseSerializer):

    show_capabilities = ['edit', 'delete']

    class Meta:
        model = OAuth2Application
        fields = (
            '*', 'description', '-user', 'client_id', 'client_secret', 'client_type',
            'redirect_uris',  'authorization_grant_type', 'skip_authorization', 'organization'
        )
        read_only_fields = ('client_id', 'client_secret')
        read_only_on_update_fields = ('user', 'authorization_grant_type')
        extra_kwargs = {
            'user': {'allow_null': True, 'required': False},
            'organization': {'allow_null': False},
            'authorization_grant_type': {'allow_null': False, 'label': _('Authorization Grant Type')},
            'client_secret': {
                'label': _('Client Secret')
            },
            'client_type': {
                'label': _('Client Type')
            },
            'redirect_uris': {
                'label': _('Redirect URIs')
            },
            'skip_authorization': {
                'label': _('Skip Authorization')
            },
        }

    def to_representation(self, obj):
        ret = super(OAuth2ApplicationSerializer, self).to_representation(obj)
        request = self.context.get('request', None)
        if request.method != 'POST' and obj.client_type == 'confidential':
            ret['client_secret'] = CENSOR_VALUE
        if obj.client_type == 'public':
            ret.pop('client_secret', None)
        return ret

    def get_related(self, obj):
        res = super(OAuth2ApplicationSerializer, self).get_related(obj)
        res.update(dict(
            tokens = self.reverse('api:o_auth2_application_token_list', kwargs={'pk': obj.pk}),
            activity_stream = self.reverse(
                'api:o_auth2_application_activity_stream_list', kwargs={'pk': obj.pk}
            )
        ))
        return res

    def get_modified(self, obj):
        if obj is None:
            return None
        return obj.updated

    def _summary_field_tokens(self, obj):
        token_list = [{'id': x.pk, 'token': CENSOR_VALUE, 'scope': x.scope} for x in obj.oauth2accesstoken_set.all()[:10]]
        if has_model_field_prefetched(obj, 'oauth2accesstoken_set'):
            token_count = len(obj.oauth2accesstoken_set.all())
        else:
            if len(token_list) < 10:
                token_count = len(token_list)
            else:
                token_count = obj.oauth2accesstoken_set.count()
        return {'count': token_count, 'results': token_list}

    def get_summary_fields(self, obj):
        ret = super(OAuth2ApplicationSerializer, self).get_summary_fields(obj)
        ret['tokens'] = self._summary_field_tokens(obj)
        return ret


class OrganizationSerializer(BaseSerializer):
    show_capabilities = ['edit', 'delete']

    class Meta:
        model = Organization
        fields = ('*', 'max_hosts', 'custom_virtualenv',)

    def get_related(self, obj):
        res = super(OrganizationSerializer, self).get_related(obj)
        res.update(dict(
            projects    = self.reverse('api:organization_projects_list',       kwargs={'pk': obj.pk}),
            inventories = self.reverse('api:organization_inventories_list',    kwargs={'pk': obj.pk}),
            job_templates = self.reverse('api:organization_job_templates_list', kwargs={'pk': obj.pk}),
            workflow_job_templates = self.reverse('api:organization_workflow_job_templates_list', kwargs={'pk': obj.pk}),
            users       = self.reverse('api:organization_users_list',          kwargs={'pk': obj.pk}),
            admins      = self.reverse('api:organization_admins_list',         kwargs={'pk': obj.pk}),
            teams       = self.reverse('api:organization_teams_list',          kwargs={'pk': obj.pk}),
            credentials = self.reverse('api:organization_credential_list',     kwargs={'pk': obj.pk}),
            applications    = self.reverse('api:organization_applications_list',     kwargs={'pk': obj.pk}),
            activity_stream = self.reverse('api:organization_activity_stream_list', kwargs={'pk': obj.pk}),
            notification_templates = self.reverse('api:organization_notification_templates_list', kwargs={'pk': obj.pk}),
            notification_templates_started = self.reverse('api:organization_notification_templates_started_list', kwargs={'pk': obj.pk}),
            notification_templates_success = self.reverse('api:organization_notification_templates_success_list', kwargs={'pk': obj.pk}),
            notification_templates_error = self.reverse('api:organization_notification_templates_error_list', kwargs={'pk': obj.pk}),
            notification_templates_approvals = self.reverse('api:organization_notification_templates_approvals_list', kwargs={'pk': obj.pk}),
            object_roles = self.reverse('api:organization_object_roles_list', kwargs={'pk': obj.pk}),
            access_list = self.reverse('api:organization_access_list', kwargs={'pk': obj.pk}),
            instance_groups = self.reverse('api:organization_instance_groups_list', kwargs={'pk': obj.pk}),
            galaxy_credentials = self.reverse('api:organization_galaxy_credentials_list', kwargs={'pk': obj.pk}),
        ))
        return res

    def get_summary_fields(self, obj):
        summary_dict = super(OrganizationSerializer, self).get_summary_fields(obj)
        counts_dict = self.context.get('related_field_counts', None)
        if counts_dict is not None and summary_dict is not None:
            if obj.id not in counts_dict:
                summary_dict['related_field_counts'] = {
                    'inventories': 0, 'teams': 0, 'users': 0,
                    'job_templates': 0, 'admins': 0, 'projects': 0}
            else:
                summary_dict['related_field_counts'] = counts_dict[obj.id]

        # Organization participation roles (admin, member) can't be assigned
        # to a team. This provides a hint to the ui so it can know to not
        # display these roles for team role selection.
        for key in ('admin_role', 'member_role',):
            if key in summary_dict.get('object_roles', {}):
                summary_dict['object_roles'][key]['user_only'] = True

        return summary_dict

    def validate(self, attrs):
        obj = self.instance
        view = self.context['view']

        obj_limit = getattr(obj, 'max_hosts', None)
        api_limit = attrs.get('max_hosts')

        if not view.request.user.is_superuser:
            if api_limit is not None and api_limit != obj_limit:
                # Only allow superusers to edit the max_hosts field
                raise serializers.ValidationError(_('Cannot change max_hosts.'))

        return super(OrganizationSerializer, self).validate(attrs)


class ProjectOptionsSerializer(BaseSerializer):

    class Meta:
        fields = ('*', 'local_path', 'scm_type', 'scm_url', 'scm_branch', 'scm_refspec',
                  'scm_clean', 'scm_delete_on_update', 'credential', 'timeout', 'scm_revision')

    def get_related(self, obj):
        res = super(ProjectOptionsSerializer, self).get_related(obj)
        if obj.credential:
            res['credential'] = self.reverse('api:credential_detail',
                                             kwargs={'pk': obj.credential.pk})
        return res

    def validate(self, attrs):
        errors = {}

        # Don't allow assigning a local_path used by another project.
        # Don't allow assigning a local_path when scm_type is set.
        valid_local_paths = Project.get_local_path_choices()
        if self.instance:
            scm_type = attrs.get('scm_type', self.instance.scm_type) or u''
        else:
            scm_type = attrs.get('scm_type', u'') or u''
        if self.instance and not scm_type:
            valid_local_paths.append(self.instance.local_path)
        if self.instance and scm_type and "local_path" in attrs and self.instance.local_path != attrs['local_path']:
            errors['local_path'] = _(f'Cannot change local_path for {scm_type}-based projects')
        if scm_type:
            attrs.pop('local_path', None)
        if 'local_path' in attrs and attrs['local_path'] not in valid_local_paths:
            errors['local_path'] = _('This path is already being used by another manual project.')
        if attrs.get('scm_branch') and scm_type == 'archive':
            errors['scm_branch'] = _('SCM branch cannot be used with archive projects.')
        if attrs.get('scm_refspec') and scm_type != 'git':
            errors['scm_refspec'] = _('SCM refspec can only be used with git projects.')

        if errors:
            raise serializers.ValidationError(errors)

        return super(ProjectOptionsSerializer, self).validate(attrs)


class ProjectSerializer(UnifiedJobTemplateSerializer, ProjectOptionsSerializer):

    status = serializers.ChoiceField(choices=Project.PROJECT_STATUS_CHOICES, read_only=True)
    last_update_failed = serializers.BooleanField(read_only=True)
    last_updated = serializers.DateTimeField(read_only=True)
    show_capabilities = ['start', 'schedule', 'edit', 'delete', 'copy']
    capabilities_prefetch = [
        'admin', 'update',
        {'copy': 'organization.project_admin'}
    ]

    class Meta:
        model = Project
        fields = ('*', 'organization', 'scm_update_on_launch',
                  'scm_update_cache_timeout', 'allow_override', 'custom_virtualenv',) + \
                 ('last_update_failed', 'last_updated')  # Backwards compatibility

    def get_related(self, obj):
        res = super(ProjectSerializer, self).get_related(obj)
        res.update(dict(
            teams = self.reverse('api:project_teams_list', kwargs={'pk': obj.pk}),
            playbooks = self.reverse('api:project_playbooks', kwargs={'pk': obj.pk}),
            inventory_files = self.reverse('api:project_inventories', kwargs={'pk': obj.pk}),
            update = self.reverse('api:project_update_view', kwargs={'pk': obj.pk}),
            project_updates = self.reverse('api:project_updates_list', kwargs={'pk': obj.pk}),
            scm_inventory_sources = self.reverse('api:project_scm_inventory_sources', kwargs={'pk': obj.pk}),
            schedules = self.reverse('api:project_schedules_list', kwargs={'pk': obj.pk}),
            activity_stream = self.reverse('api:project_activity_stream_list', kwargs={'pk': obj.pk}),
            notification_templates_started = self.reverse('api:project_notification_templates_started_list', kwargs={'pk': obj.pk}),
            notification_templates_success = self.reverse('api:project_notification_templates_success_list', kwargs={'pk': obj.pk}),
            notification_templates_error = self.reverse('api:project_notification_templates_error_list', kwargs={'pk': obj.pk}),
            access_list = self.reverse('api:project_access_list', kwargs={'pk': obj.pk}),
            object_roles = self.reverse('api:project_object_roles_list', kwargs={'pk': obj.pk}),
            copy = self.reverse('api:project_copy', kwargs={'pk': obj.pk})

        ))
        if obj.organization:
            res['organization'] = self.reverse('api:organization_detail',
                                               kwargs={'pk': obj.organization.pk})
        # Backwards compatibility.
        if obj.current_update:
            res['current_update'] = self.reverse('api:project_update_detail',
                                                 kwargs={'pk': obj.current_update.pk})
        if obj.last_update:
            res['last_update'] = self.reverse('api:project_update_detail',
                                              kwargs={'pk': obj.last_update.pk})
        return res

    def to_representation(self, obj):
        ret = super(ProjectSerializer, self).to_representation(obj)
        if 'scm_revision' in ret and obj.scm_type == '':
            ret['scm_revision'] = ''
        return ret

    def validate(self, attrs):
        def get_field_from_model_or_attrs(fd):
            return attrs.get(fd, self.instance and getattr(self.instance, fd) or None)

        if 'allow_override' in attrs and self.instance:
            # case where user is turning off this project setting
            if self.instance.allow_override and not attrs['allow_override']:
                used_by = set(
                    JobTemplate.objects.filter(
                        models.Q(project=self.instance),
                        models.Q(ask_scm_branch_on_launch=True) | ~models.Q(scm_branch="")
                    ).values_list('pk', flat=True)
                )
                if used_by:
                    raise serializers.ValidationError({
                        'allow_override': _('One or more job templates depend on branch override behavior for this project (ids: {}).').format(
                            ' '.join([str(pk) for pk in used_by])
                        )})

        if get_field_from_model_or_attrs('scm_type') == '':
            for fd in ('scm_update_on_launch', 'scm_delete_on_update', 'scm_clean'):
                if get_field_from_model_or_attrs(fd):
                    raise serializers.ValidationError({fd: _('Update options must be set to false for manual projects.')})
        return super(ProjectSerializer, self).validate(attrs)


class ProjectPlaybooksSerializer(ProjectSerializer):

    playbooks = serializers.SerializerMethodField(help_text=_('Array of playbooks available within this project.'))

    class Meta:
        model = Project
        fields = ('playbooks',)

    def get_playbooks(self, obj):
        return obj.playbook_files if obj.scm_type else obj.playbooks

    @property
    def data(self):
        ret = super(ProjectPlaybooksSerializer, self).data
        ret = ret.get('playbooks', [])
        return ReturnList(ret, serializer=self)


class ProjectInventoriesSerializer(ProjectSerializer):

    inventory_files = serializers.ReadOnlyField(help_text=_(
        'Array of inventory files and directories available within this project, '
        'not comprehensive.'))

    class Meta:
        model = Project
        fields = ('inventory_files',)

    @property
    def data(self):
        ret = super(ProjectInventoriesSerializer, self).data
        ret = ret.get('inventory_files', [])
        return ReturnList(ret, serializer=self)


class ProjectUpdateViewSerializer(ProjectSerializer):

    can_update = serializers.BooleanField(read_only=True)

    class Meta:
        fields = ('can_update',)


class ProjectUpdateSerializer(UnifiedJobSerializer, ProjectOptionsSerializer):

    class Meta:
        model = ProjectUpdate
        fields = ('*', 'project', 'job_type', 'job_tags', '-controller_node')

    def get_related(self, obj):
        res = super(ProjectUpdateSerializer, self).get_related(obj)
        try:
            res.update(dict(
                project = self.reverse('api:project_detail', kwargs={'pk': obj.project.pk}),
            ))
        except ObjectDoesNotExist:
            pass
        res.update(dict(
            cancel = self.reverse('api:project_update_cancel', kwargs={'pk': obj.pk}),
            scm_inventory_updates = self.reverse('api:project_update_scm_inventory_updates', kwargs={'pk': obj.pk}),
            notifications = self.reverse('api:project_update_notifications_list', kwargs={'pk': obj.pk}),
            events = self.reverse('api:project_update_events_list', kwargs={'pk': obj.pk}),
        ))
        return res


class ProjectUpdateDetailSerializer(ProjectUpdateSerializer):

    host_status_counts = serializers.SerializerMethodField(
        help_text=_('A count of hosts uniquely assigned to each status.'),
    )
    playbook_counts = serializers.SerializerMethodField(
        help_text=_('A count of all plays and tasks for the job run.'),
    )

    class Meta:
        model = ProjectUpdate
        fields = ('*', 'host_status_counts', 'playbook_counts',)

    def get_playbook_counts(self, obj):
        task_count = obj.project_update_events.filter(event='playbook_on_task_start').count()
        play_count = obj.project_update_events.filter(event='playbook_on_play_start').count()

        data = {'play_count': play_count, 'task_count': task_count}

        return data

    def get_host_status_counts(self, obj):
        try:
            counts = obj.project_update_events.only('event_data').get(event='playbook_on_stats').get_host_status_counts()
        except ProjectUpdateEvent.DoesNotExist:
            counts = {}

        return counts


class ProjectUpdateListSerializer(ProjectUpdateSerializer, UnifiedJobListSerializer):

    class Meta:
        model = ProjectUpdate
        fields = ('*', '-controller_node')  # field removal undone by UJ serializer


class ProjectUpdateCancelSerializer(ProjectUpdateSerializer):

    can_cancel = serializers.BooleanField(read_only=True)

    class Meta:
        fields = ('can_cancel',)


class BaseSerializerWithVariables(BaseSerializer):

    def validate_variables(self, value):
        return vars_validate_or_raise(value)


class InventorySerializer(BaseSerializerWithVariables):
    show_capabilities = ['edit', 'delete', 'adhoc', 'copy']
    capabilities_prefetch = [
        'admin', 'adhoc',
        {'copy': 'organization.inventory_admin'}
    ]


    class Meta:
        model = Inventory
        fields = ('*', 'organization', 'kind', 'host_filter', 'variables', 'has_active_failures',
                  'total_hosts', 'hosts_with_active_failures', 'total_groups',
                  'has_inventory_sources', 'total_inventory_sources',
                  'inventory_sources_with_failures', 'insights_credential',
                  'pending_deletion',)

    def get_related(self, obj):
        res = super(InventorySerializer, self).get_related(obj)
        res.update(dict(
            hosts         = self.reverse('api:inventory_hosts_list',        kwargs={'pk': obj.pk}),
            groups        = self.reverse('api:inventory_groups_list',       kwargs={'pk': obj.pk}),
            root_groups   = self.reverse('api:inventory_root_groups_list',  kwargs={'pk': obj.pk}),
            variable_data = self.reverse('api:inventory_variable_data',     kwargs={'pk': obj.pk}),
            script        = self.reverse('api:inventory_script_view',       kwargs={'pk': obj.pk}),
            tree          = self.reverse('api:inventory_tree_view',         kwargs={'pk': obj.pk}),
            inventory_sources = self.reverse('api:inventory_inventory_sources_list', kwargs={'pk': obj.pk}),
            update_inventory_sources = self.reverse('api:inventory_inventory_sources_update', kwargs={'pk': obj.pk}),
            activity_stream = self.reverse('api:inventory_activity_stream_list', kwargs={'pk': obj.pk}),
            job_templates = self.reverse('api:inventory_job_template_list', kwargs={'pk': obj.pk}),
            ad_hoc_commands = self.reverse('api:inventory_ad_hoc_commands_list', kwargs={'pk': obj.pk}),
            access_list = self.reverse('api:inventory_access_list',         kwargs={'pk': obj.pk}),
            object_roles = self.reverse('api:inventory_object_roles_list', kwargs={'pk': obj.pk}),
            instance_groups = self.reverse('api:inventory_instance_groups_list', kwargs={'pk': obj.pk}),
            copy = self.reverse('api:inventory_copy', kwargs={'pk': obj.pk})
        ))
        if obj.insights_credential:
            res['insights_credential'] = self.reverse('api:credential_detail', kwargs={'pk': obj.insights_credential.pk})
        if obj.organization:
            res['organization'] = self.reverse('api:organization_detail', kwargs={'pk': obj.organization.pk})
        return res

    def to_representation(self, obj):
        ret = super(InventorySerializer, self).to_representation(obj)
        if obj is not None and 'organization' in ret and not obj.organization:
            ret['organization'] = None
        return ret

    def validate_host_filter(self, host_filter):
        if host_filter:
            try:
                for match in JSONBField.get_lookups().keys():
                    if match == 'exact':
                        # __exact is allowed
                        continue
                    match = '__{}'.format(match)
                    if re.match(
                        'ansible_facts[^=]+{}='.format(match),
                        host_filter
                    ):
                        raise models.base.ValidationError({
                            'host_filter': 'ansible_facts does not support searching with {}'.format(match)
                        })
                SmartFilter().query_from_string(host_filter)
            except RuntimeError as e:
                raise models.base.ValidationError(str(e))
        return host_filter

    def validate(self, attrs):
        kind = None
        if 'kind' in attrs:
            kind = attrs['kind']
        elif self.instance:
            kind = self.instance.kind

        host_filter = None
        if 'host_filter' in attrs:
            host_filter = attrs['host_filter']
        elif self.instance:
            host_filter = self.instance.host_filter

        if kind == 'smart' and not host_filter:
            raise serializers.ValidationError({'host_filter': _(
                'Smart inventories must specify host_filter')})
        return super(InventorySerializer, self).validate(attrs)


class InventoryScriptSerializer(InventorySerializer):

    class Meta:
        fields = ()


class HostSerializer(BaseSerializerWithVariables):
    show_capabilities = ['edit', 'delete']
    capabilities_prefetch = ['inventory.admin']

    has_active_failures = serializers.SerializerMethodField()
    has_inventory_sources = serializers.SerializerMethodField()

    class Meta:
        model = Host
        fields = ('*', 'inventory', 'enabled', 'instance_id', 'variables',
                  'has_active_failures', 'has_inventory_sources', 'last_job',
                  'last_job_host_summary', 'insights_system_id', 'ansible_facts_modified',)
        read_only_fields = ('last_job', 'last_job_host_summary', 'insights_system_id',
                            'ansible_facts_modified',)

    def build_relational_field(self, field_name, relation_info):
        field_class, field_kwargs = super(HostSerializer, self).build_relational_field(field_name, relation_info)
        # Inventory is read-only unless creating a new host.
        if self.instance and field_name == 'inventory':
            field_kwargs['read_only'] = True
            field_kwargs.pop('queryset', None)
        return field_class, field_kwargs

    def get_related(self, obj):
        res = super(HostSerializer, self).get_related(obj)
        res.update(dict(
            variable_data = self.reverse('api:host_variable_data',   kwargs={'pk': obj.pk}),
            groups        = self.reverse('api:host_groups_list',     kwargs={'pk': obj.pk}),
            all_groups    = self.reverse('api:host_all_groups_list', kwargs={'pk': obj.pk}),
            job_events    = self.reverse('api:host_job_events_list',  kwargs={'pk': obj.pk}),
            job_host_summaries = self.reverse('api:host_job_host_summaries_list', kwargs={'pk': obj.pk}),
            activity_stream = self.reverse('api:host_activity_stream_list', kwargs={'pk': obj.pk}),
            inventory_sources = self.reverse('api:host_inventory_sources_list', kwargs={'pk': obj.pk}),
            smart_inventories = self.reverse('api:host_smart_inventories_list', kwargs={'pk': obj.pk}),
            ad_hoc_commands = self.reverse('api:host_ad_hoc_commands_list', kwargs={'pk': obj.pk}),
            ad_hoc_command_events = self.reverse('api:host_ad_hoc_command_events_list', kwargs={'pk': obj.pk}),
            insights = self.reverse('api:host_insights', kwargs={'pk': obj.pk}),
            ansible_facts = self.reverse('api:host_ansible_facts_detail', kwargs={'pk': obj.pk}),
        ))
        if obj.inventory:
            res['inventory'] = self.reverse('api:inventory_detail', kwargs={'pk': obj.inventory.pk})
        if obj.last_job:
            res['last_job'] = self.reverse('api:job_detail', kwargs={'pk': obj.last_job.pk})
        if obj.last_job_host_summary:
            res['last_job_host_summary'] = self.reverse('api:job_host_summary_detail', kwargs={'pk': obj.last_job_host_summary.pk})
        return res

    def get_summary_fields(self, obj):
        d = super(HostSerializer, self).get_summary_fields(obj)
        try:
            d['last_job']['job_template_id'] = obj.last_job.job_template.id
            d['last_job']['job_template_name'] = obj.last_job.job_template.name
        except (KeyError, AttributeError):
            pass
        if has_model_field_prefetched(obj, 'groups'):
            group_list = sorted([{'id': g.id, 'name': g.name} for g in obj.groups.all()], key=lambda x: x['id'])[:5]
        else:
            group_list = [{'id': g.id, 'name': g.name} for g in obj.groups.all().order_by('id')[:5]]
        group_cnt = obj.groups.count()
        d.setdefault('groups', {'count': group_cnt, 'results': group_list})
        d.setdefault('recent_jobs', [{
            'id': j.job.id,
            'name': j.job.job_template.name if j.job.job_template is not None else "",
            'type': j.job.job_type_name,
            'status': j.job.status,
            'finished': j.job.finished,
        } for j in obj.job_host_summaries.select_related('job__job_template').order_by('-created').defer(
            'job__extra_vars',
            'job__artifacts',
        )[:5]])
        return d

    def _get_host_port_from_name(self, name):
        # Allow hostname (except IPv6 for now) to specify the port # inline.
        port = None
        if name.count(':') == 1:
            name, port = name.split(':')
            try:
                port = int(port)
                if port < 1 or port > 65535:
                    raise ValueError
            except ValueError:
                raise serializers.ValidationError(_(u'Invalid port specification: %s') % force_text(port))
        return name, port

    def validate_name(self, value):
        name = force_text(value or '')
        # Validate here only, update in main validate method.
        host, port = self._get_host_port_from_name(name)
        return value

    def validate_inventory(self, value):
        if value.kind == 'smart':
            raise serializers.ValidationError({"detail": _("Cannot create Host for Smart Inventory")})
        return value

    def validate_variables(self, value):
        return vars_validate_or_raise(value)

    def validate(self, attrs):
        name = force_text(attrs.get('name', self.instance and self.instance.name or ''))
        inventory = attrs.get('inventory', self.instance and self.instance.inventory or '')
        host, port = self._get_host_port_from_name(name)

        if port:
            attrs['name'] = host
            variables = force_text(attrs.get('variables', self.instance and self.instance.variables or ''))
            vars_dict = parse_yaml_or_json(variables)
            vars_dict['ansible_ssh_port'] = port
            attrs['variables'] = json.dumps(vars_dict)
        if Group.objects.filter(name=name, inventory=inventory).exists():
            raise serializers.ValidationError(_('A Group with that name already exists.'))

        return super(HostSerializer, self).validate(attrs)

    def to_representation(self, obj):
        ret = super(HostSerializer, self).to_representation(obj)
        if not obj:
            return ret
        if 'inventory' in ret and not obj.inventory:
            ret['inventory'] = None
        if 'last_job' in ret and not obj.last_job:
            ret['last_job'] = None
        if 'last_job_host_summary' in ret and not obj.last_job_host_summary:
            ret['last_job_host_summary'] = None
        return ret

    def get_has_active_failures(self, obj):
        return bool(
            obj.last_job_host_summary and obj.last_job_host_summary.failed
        )

    def get_has_inventory_sources(self, obj):
        return obj.inventory_sources.exists()


class AnsibleFactsSerializer(BaseSerializer):
    class Meta:
        model = Host

    def to_representation(self, obj):
        return obj.ansible_facts


class GroupSerializer(BaseSerializerWithVariables):
    show_capabilities = ['copy', 'edit', 'delete']
    capabilities_prefetch = ['inventory.admin', 'inventory.adhoc']

    class Meta:
        model = Group
        fields = ('*', 'inventory', 'variables')

    def build_relational_field(self, field_name, relation_info):
        field_class, field_kwargs = super(GroupSerializer, self).build_relational_field(field_name, relation_info)
        # Inventory is read-only unless creating a new group.
        if self.instance and field_name == 'inventory':
            field_kwargs['read_only'] = True
            field_kwargs.pop('queryset', None)
        return field_class, field_kwargs

    def get_related(self, obj):
        res = super(GroupSerializer, self).get_related(obj)
        res.update(dict(
            variable_data = self.reverse('api:group_variable_data',   kwargs={'pk': obj.pk}),
            hosts         = self.reverse('api:group_hosts_list',      kwargs={'pk': obj.pk}),
            potential_children = self.reverse('api:group_potential_children_list',   kwargs={'pk': obj.pk}),
            children      = self.reverse('api:group_children_list',   kwargs={'pk': obj.pk}),
            all_hosts     = self.reverse('api:group_all_hosts_list',  kwargs={'pk': obj.pk}),
            job_events    = self.reverse('api:group_job_events_list',   kwargs={'pk': obj.pk}),
            job_host_summaries = self.reverse('api:group_job_host_summaries_list', kwargs={'pk': obj.pk}),
            activity_stream = self.reverse('api:group_activity_stream_list', kwargs={'pk': obj.pk}),
            inventory_sources = self.reverse('api:group_inventory_sources_list', kwargs={'pk': obj.pk}),
            ad_hoc_commands = self.reverse('api:group_ad_hoc_commands_list', kwargs={'pk': obj.pk}),
        ))
        if obj.inventory:
            res['inventory'] = self.reverse('api:inventory_detail', kwargs={'pk': obj.inventory.pk})
        return res

    def validate(self, attrs):
        name = force_text(attrs.get('name', self.instance and self.instance.name or ''))
        inventory = attrs.get('inventory', self.instance and self.instance.inventory or '')
        if Host.objects.filter(name=name, inventory=inventory).exists():
            raise serializers.ValidationError(_('A Host with that name already exists.'))
        return super(GroupSerializer, self).validate(attrs)

    def validate_name(self, value):
        if value in ('all', '_meta'):
            raise serializers.ValidationError(_('Invalid group name.'))
        return value

    def validate_inventory(self, value):
        if value.kind == 'smart':
            raise serializers.ValidationError({"detail": _("Cannot create Group for Smart Inventory")})
        return value

    def to_representation(self, obj):
        ret = super(GroupSerializer, self).to_representation(obj)
        if obj is not None and 'inventory' in ret and not obj.inventory:
            ret['inventory'] = None
        return ret


class GroupTreeSerializer(GroupSerializer):

    children = serializers.SerializerMethodField()

    class Meta:
        model = Group
        fields = ('*', 'children')

    def get_children(self, obj):
        if obj is None:
            return {}
        children_qs = obj.children
        children_qs = children_qs.select_related('inventory')
        children_qs = children_qs.prefetch_related('inventory_source')
        return GroupTreeSerializer(children_qs, many=True).data


class BaseVariableDataSerializer(BaseSerializer):

    class Meta:
        fields = ('variables',)

    def to_representation(self, obj):
        if obj is None:
            return {}
        ret = super(BaseVariableDataSerializer, self).to_representation(obj)
        return parse_yaml_or_json(ret.get('variables', '') or '{}')

    def to_internal_value(self, data):
        data = {'variables': json.dumps(data)}
        return super(BaseVariableDataSerializer, self).to_internal_value(data)


class InventoryVariableDataSerializer(BaseVariableDataSerializer):

    class Meta:
        model = Inventory


class HostVariableDataSerializer(BaseVariableDataSerializer):

    class Meta:
        model = Host


class GroupVariableDataSerializer(BaseVariableDataSerializer):

    class Meta:
        model = Group


class CustomInventoryScriptSerializer(BaseSerializer):

    script = serializers.CharField(trim_whitespace=False)
    show_capabilities = ['edit', 'delete', 'copy']
    capabilities_prefetch = [
        {'edit': 'admin'}
    ]

    class Meta:
        model = CustomInventoryScript
        fields = ('*', "script", "organization")

    def validate_script(self, value):
        if not value.startswith("#!"):
            raise serializers.ValidationError(_('Script must begin with a hashbang sequence: i.e.... #!/usr/bin/env python'))
        return value

    def to_representation(self, obj):
        ret = super(CustomInventoryScriptSerializer, self).to_representation(obj)
        if obj is None:
            return ret
        request = self.context.get('request', None)
        if request.user not in obj.admin_role and \
           not request.user.is_superuser and \
           not request.user.is_system_auditor and \
           not (obj.organization is not None and request.user in obj.organization.auditor_role):
            ret['script'] = None
        return ret

    def get_related(self, obj):
        res = super(CustomInventoryScriptSerializer, self).get_related(obj)
        res.update(dict(
            object_roles = self.reverse('api:inventory_script_object_roles_list', kwargs={'pk': obj.pk}),
            copy = self.reverse('api:inventory_script_copy', kwargs={'pk': obj.pk}),
        ))

        if obj.organization:
            res['organization'] = self.reverse('api:organization_detail', kwargs={'pk': obj.organization.pk})
        return res


class InventorySourceOptionsSerializer(BaseSerializer):
    credential = DeprecatedCredentialField(
        help_text=_('Cloud credential to use for inventory updates.')
    )

    class Meta:
        fields = ('*', 'source', 'source_path', 'source_script', 'source_vars', 'credential',
                  'enabled_var', 'enabled_value', 'host_filter', 'overwrite', 'overwrite_vars',
                  'custom_virtualenv', 'timeout', 'verbosity')

    def get_related(self, obj):
        res = super(InventorySourceOptionsSerializer, self).get_related(obj)
        if obj.credential:  # TODO: remove when 'credential' field is removed
            res['credential'] = self.reverse('api:credential_detail',
                                             kwargs={'pk': obj.credential})
        if obj.source_script:
            res['source_script'] = self.reverse('api:inventory_script_detail', kwargs={'pk': obj.source_script.pk})
        return res

    def validate_source_vars(self, value):
        ret = vars_validate_or_raise(value)
        for env_k in parse_yaml_or_json(value):
            if env_k in settings.INV_ENV_VARIABLE_BLOCKED:
                raise serializers.ValidationError(_("`{}` is a prohibited environment variable".format(env_k)))
        return ret

    def validate(self, attrs):
        # TODO: Validate source
        errors = {}

        source = attrs.get('source', self.instance and self.instance.source or '')
        source_script = attrs.get('source_script', self.instance and self.instance.source_script or '')
        if source == 'custom':
            if source_script is None or source_script == '':
                errors['source_script'] = _("If 'source' is 'custom', 'source_script' must be provided.")
            else:
                try:
                    if not self.instance:
                        dest_inventory = attrs.get('inventory', None)
                        if not dest_inventory:
                            errors['inventory'] = _("Must provide an inventory.")
                    else:
                        dest_inventory = self.instance.inventory
                    if dest_inventory and source_script.organization != dest_inventory.organization:
                        errors['source_script'] = _("The 'source_script' does not belong to the same organization as the inventory.")
                except Exception:
                    errors['source_script'] = _("'source_script' doesn't exist.")
                    logger.exception('Problem processing source_script validation.')

        if errors:
            raise serializers.ValidationError(errors)

        return super(InventorySourceOptionsSerializer, self).validate(attrs)

    # TODO: remove when old 'credential' fields are removed
    def get_summary_fields(self, obj):
        summary_fields = super(InventorySourceOptionsSerializer, self).get_summary_fields(obj)
        all_creds = []
        if 'credential' in summary_fields:
            cred = obj.get_cloud_credential()
            if cred:
                summarized_cred = {
                    'id': cred.id, 'name': cred.name, 'description': cred.description,
                    'kind': cred.kind, 'cloud': True
                }
                summary_fields['credential'] = summarized_cred
                all_creds.append(summarized_cred)
                summary_fields['credential']['credential_type_id'] = cred.credential_type_id
            else:
                summary_fields.pop('credential')
        summary_fields['credentials'] = all_creds
        return summary_fields


class InventorySourceSerializer(UnifiedJobTemplateSerializer, InventorySourceOptionsSerializer):

    status = serializers.ChoiceField(choices=InventorySource.INVENTORY_SOURCE_STATUS_CHOICES, read_only=True)
    last_update_failed = serializers.BooleanField(read_only=True)
    last_updated = serializers.DateTimeField(read_only=True)
    show_capabilities = ['start', 'schedule', 'edit', 'delete']
    capabilities_prefetch = [
        {'admin': 'inventory.admin'},
        {'start': 'inventory.update'}
    ]

    class Meta:
        model = InventorySource
        fields = ('*', 'name', 'inventory', 'update_on_launch', 'update_cache_timeout',
                  'source_project', 'update_on_project_update') + \
                 ('last_update_failed', 'last_updated') # Backwards compatibility.
        extra_kwargs = {
            'inventory': {'required': True}
        }

    def get_related(self, obj):
        res = super(InventorySourceSerializer, self).get_related(obj)
        res.update(dict(
            update = self.reverse('api:inventory_source_update_view', kwargs={'pk': obj.pk}),
            inventory_updates = self.reverse('api:inventory_source_updates_list', kwargs={'pk': obj.pk}),
            schedules = self.reverse('api:inventory_source_schedules_list', kwargs={'pk': obj.pk}),
            activity_stream = self.reverse('api:inventory_source_activity_stream_list', kwargs={'pk': obj.pk}),
            hosts = self.reverse('api:inventory_source_hosts_list', kwargs={'pk': obj.pk}),
            groups = self.reverse('api:inventory_source_groups_list', kwargs={'pk': obj.pk}),
            notification_templates_started = self.reverse('api:inventory_source_notification_templates_started_list', kwargs={'pk': obj.pk}),
            notification_templates_success = self.reverse('api:inventory_source_notification_templates_success_list', kwargs={'pk': obj.pk}),
            notification_templates_error = self.reverse('api:inventory_source_notification_templates_error_list', kwargs={'pk': obj.pk}),
        ))
        if obj.inventory:
            res['inventory'] = self.reverse('api:inventory_detail', kwargs={'pk': obj.inventory.pk})
        if obj.source_project_id is not None:
            res['source_project'] = self.reverse('api:project_detail', kwargs={'pk': obj.source_project.pk})
        # Backwards compatibility.
        if obj.current_update:
            res['current_update'] = self.reverse('api:inventory_update_detail',
                                                 kwargs={'pk': obj.current_update.pk})
        if obj.last_update:
            res['last_update'] = self.reverse('api:inventory_update_detail',
                                              kwargs={'pk': obj.last_update.pk})
        else:
            res['credentials'] = self.reverse('api:inventory_source_credentials_list', kwargs={'pk': obj.pk})
        return res

    def build_relational_field(self, field_name, relation_info):
        field_class, field_kwargs = super(InventorySourceSerializer, self).build_relational_field(field_name, relation_info)
        # SCM Project and inventory are read-only unless creating a new inventory.
        if self.instance and field_name == 'inventory':
            field_kwargs['read_only'] = True
            field_kwargs.pop('queryset', None)
        return field_class, field_kwargs

    # TODO: remove when old 'credential' fields are removed
    def build_field(self, field_name, info, model_class, nested_depth):
        # have to special-case the field so that DRF will not automagically make it
        # read-only because it's a property on the model.
        if field_name == 'credential':
            return self.build_standard_field(field_name, self.credential)
        return super(InventorySourceOptionsSerializer, self).build_field(field_name, info, model_class, nested_depth)

    def to_representation(self, obj):
        ret = super(InventorySourceSerializer, self).to_representation(obj)
        if obj is None:
            return ret
        if 'inventory' in ret and not obj.inventory:
            ret['inventory'] = None
        return ret

    def validate_source_project(self, value):
        if value and value.scm_type == '':
            raise serializers.ValidationError(_("Cannot use manual project for SCM-based inventory."))
        return value

    def validate_update_on_project_update(self, value):
        if value and self.instance and self.instance.schedules.exists():
            raise serializers.ValidationError(_("Setting not compatible with existing schedules."))
        return value

    def validate_inventory(self, value):
        if value and value.kind == 'smart':
            raise serializers.ValidationError({"detail": _("Cannot create Inventory Source for Smart Inventory")})
        return value

    # TODO: remove when old 'credential' fields are removed
    def create(self, validated_data):
        deprecated_fields = {}
        if 'credential' in validated_data:
            deprecated_fields['credential'] = validated_data.pop('credential')
        obj = super(InventorySourceSerializer, self).create(validated_data)
        if deprecated_fields:
            self._update_deprecated_fields(deprecated_fields, obj)
        return obj

    # TODO: remove when old 'credential' fields are removed
    def update(self, obj, validated_data):
        deprecated_fields = {}
        if 'credential' in validated_data:
            deprecated_fields['credential'] = validated_data.pop('credential')
        obj = super(InventorySourceSerializer, self).update(obj, validated_data)
        if deprecated_fields:
            self._update_deprecated_fields(deprecated_fields, obj)
        return obj

    # TODO: remove when old 'credential' fields are removed
    def _update_deprecated_fields(self, fields, obj):
        if 'credential' in fields:
            new_cred = fields['credential']
            existing = obj.credentials.all()
            if new_cred not in existing:
                for cred in existing:
                    # Remove all other cloud credentials
                    obj.credentials.remove(cred)
                if new_cred:
                    # Add new credential
                    obj.credentials.add(new_cred)

    def validate(self, attrs):
        deprecated_fields = {}
        if 'credential' in attrs:  # TODO: remove when 'credential' field removed
            deprecated_fields['credential'] = attrs.pop('credential')

        def get_field_from_model_or_attrs(fd):
            return attrs.get(fd, self.instance and getattr(self.instance, fd) or None)

        if get_field_from_model_or_attrs('source') == 'scm':
            if (('source' in attrs or 'source_project' in attrs) and
                    get_field_from_model_or_attrs('source_project') is None):
                raise serializers.ValidationError(
                    {"source_project": _("Project required for scm type sources.")}
                )
        else:
            redundant_scm_fields = list(filter(
                lambda x: attrs.get(x, None),
                ['source_project', 'source_path', 'update_on_project_update']
            ))
            if redundant_scm_fields:
                raise serializers.ValidationError(
                    {"detail": _("Cannot set %s if not SCM type." % ' '.join(redundant_scm_fields))}
                )

        attrs = super(InventorySourceSerializer, self).validate(attrs)

        # Check type consistency of source and cloud credential, if provided
        if 'credential' in deprecated_fields:  # TODO: remove when v2 API is deprecated
            cred = deprecated_fields['credential']
            attrs['credential'] = cred
            if cred is not None:
                cred = Credential.objects.get(pk=cred)
                view = self.context.get('view', None)
                if (not view) or (not view.request) or (view.request.user not in cred.use_role):
                    raise PermissionDenied()
            cred_error = InventorySource.cloud_credential_validation(
                get_field_from_model_or_attrs('source'),
                cred
            )
            if cred_error:
                raise serializers.ValidationError({"credential": cred_error})

        return attrs


class InventorySourceUpdateSerializer(InventorySourceSerializer):

    can_update = serializers.BooleanField(read_only=True)

    class Meta:
        fields = ('can_update',)


class InventoryUpdateSerializer(UnifiedJobSerializer, InventorySourceOptionsSerializer):

    custom_virtualenv = serializers.ReadOnlyField()

    class Meta:
        model = InventoryUpdate
        fields = ('*', 'inventory', 'inventory_source', 'license_error', 'org_host_limit_error',
                  'source_project_update', 'custom_virtualenv', '-controller_node',)

    def get_related(self, obj):
        res = super(InventoryUpdateSerializer, self).get_related(obj)
        try:
            res.update(dict(
                inventory_source = self.reverse(
                    'api:inventory_source_detail', kwargs={'pk': obj.inventory_source.pk}
                ),
            ))
        except ObjectDoesNotExist:
            pass
        res.update(dict(
            cancel = self.reverse('api:inventory_update_cancel', kwargs={'pk': obj.pk}),
            notifications = self.reverse('api:inventory_update_notifications_list', kwargs={'pk': obj.pk}),
            events = self.reverse('api:inventory_update_events_list', kwargs={'pk': obj.pk}),
        ))
        if obj.source_project_update_id:
            res['source_project_update'] = self.reverse('api:project_update_detail',
                                                        kwargs={'pk': obj.source_project_update.pk})
        if obj.inventory:
            res['inventory'] = self.reverse('api:inventory_detail', kwargs={'pk': obj.inventory.pk})

        res['credentials'] = self.reverse('api:inventory_update_credentials_list', kwargs={'pk': obj.pk})

        return res


class InventoryUpdateDetailSerializer(InventoryUpdateSerializer):

    source_project = serializers.SerializerMethodField(
        help_text=_('The project used for this job.'),
        method_name='get_source_project_id'
    )

    class Meta:
        model = InventoryUpdate
        fields = ('*', 'source_project',)

    def get_source_project(self, obj):
        return getattrd(obj, 'source_project_update.unified_job_template', None)

    def get_source_project_id(self, obj):
        return getattrd(obj, 'source_project_update.unified_job_template.id', None)

    def get_related(self, obj):
        res = super(InventoryUpdateDetailSerializer, self).get_related(obj)
        source_project_id = self.get_source_project_id(obj)

        if source_project_id:
            res['source_project'] = self.reverse('api:project_detail', kwargs={'pk': source_project_id})
        return res

    def get_summary_fields(self, obj):
        summary_fields = super(InventoryUpdateDetailSerializer, self).get_summary_fields(obj)

        source_project = self.get_source_project(obj)
        if source_project:
            summary_fields['source_project'] = {}
            for field in SUMMARIZABLE_FK_FIELDS['project']:
                value = getattr(source_project, field, None)
                if value is not None:
                    summary_fields['source_project'][field] = value

        cred = obj.credentials.first()
        if cred:
            summary_fields['credential'] = {
                'id': cred.pk,
                'name': cred.name,
                'description': cred.description,
                'kind': cred.kind,
                'cloud': cred.credential_type.kind == 'cloud'
            }

        return summary_fields


class InventoryUpdateListSerializer(InventoryUpdateSerializer, UnifiedJobListSerializer):

    class Meta:
        model = InventoryUpdate
        fields = ('*', '-controller_node')  # field removal undone by UJ serializer


class InventoryUpdateCancelSerializer(InventoryUpdateSerializer):

    can_cancel = serializers.BooleanField(read_only=True)

    class Meta:
        fields = ('can_cancel',)


class TeamSerializer(BaseSerializer):
    show_capabilities = ['edit', 'delete']

    class Meta:
        model = Team
        fields = ('*', 'organization')

    def get_related(self, obj):
        res = super(TeamSerializer, self).get_related(obj)
        res.update(dict(
            projects     = self.reverse('api:team_projects_list',    kwargs={'pk': obj.pk}),
            users        = self.reverse('api:team_users_list',       kwargs={'pk': obj.pk}),
            credentials  = self.reverse('api:team_credentials_list', kwargs={'pk': obj.pk}),
            roles        = self.reverse('api:team_roles_list',       kwargs={'pk': obj.pk}),
            object_roles        = self.reverse('api:team_object_roles_list',       kwargs={'pk': obj.pk}),
            activity_stream = self.reverse('api:team_activity_stream_list', kwargs={'pk': obj.pk}),
            access_list  = self.reverse('api:team_access_list',      kwargs={'pk': obj.pk}),
        ))
        if obj.organization:
            res['organization'] = self.reverse('api:organization_detail',   kwargs={'pk': obj.organization.pk})
        return res

    def to_representation(self, obj):
        ret = super(TeamSerializer, self).to_representation(obj)
        if obj is not None and 'organization' in ret and not obj.organization:
            ret['organization'] = None
        return ret


class RoleSerializer(BaseSerializer):

    class Meta:
        model = Role
        fields = ('*', '-created', '-modified')
        read_only_fields = ('id', 'role_field', 'description', 'name')

    def to_representation(self, obj):
        ret = super(RoleSerializer, self).to_representation(obj)

        if obj.object_id:
            content_object = obj.content_object
            if hasattr(content_object, 'username'):
                ret['summary_fields']['resource_name'] = obj.content_object.username
            if hasattr(content_object, 'name'):
                ret['summary_fields']['resource_name'] = obj.content_object.name
            content_model = obj.content_type.model_class()
            ret['summary_fields']['resource_type'] = get_type_for_model(content_model)
            ret['summary_fields']['resource_type_display_name'] = content_model._meta.verbose_name.title()
            ret['summary_fields']['resource_id'] = obj.object_id

        return ret

    def get_related(self, obj):
        ret = super(RoleSerializer, self).get_related(obj)
        ret['users'] = self.reverse('api:role_users_list', kwargs={'pk': obj.pk})
        ret['teams'] = self.reverse('api:role_teams_list', kwargs={'pk': obj.pk})
        try:
            if obj.content_object:
                ret.update(reverse_gfk(obj.content_object, self.context.get('request')))
        except AttributeError:
            # AttributeError's happen if our content_object is pointing at
            # a model that no longer exists. This is dirty data and ideally
            # doesn't exist, but in case it does, let's not puke.
            pass
        return ret


class RoleSerializerWithParentAccess(RoleSerializer):
    show_capabilities = ['unattach']


class ResourceAccessListElementSerializer(UserSerializer):
    show_capabilities = []  # Clear fields from UserSerializer parent class

    def to_representation(self, user):
        '''
        With this method we derive "direct" and "indirect" access lists. Contained
        in the direct access list are all the roles the user is a member of, and
        all of the roles that are directly granted to any teams that the user is a
        member of.

        The indirect access list is a list of all of the roles that the user is
        a member of that are ancestors of any roles that grant permissions to
        the resource.
        '''
        ret = super(ResourceAccessListElementSerializer, self).to_representation(user)
        obj = self.context['view'].get_parent_object()
        if self.context['view'].request is not None:
            requesting_user = self.context['view'].request.user
        else:
            requesting_user = None

        if 'summary_fields' not in ret:
            ret['summary_fields'] = {}

        def format_role_perm(role):
            role_dict = { 'id': role.id, 'name': role.name, 'description': role.description}
            try:
                role_dict['resource_name'] = role.content_object.name
                role_dict['resource_type'] = get_type_for_model(role.content_type.model_class())
                role_dict['related'] = reverse_gfk(role.content_object, self.context.get('request'))
            except AttributeError:
                pass
            if role.content_type is not None:
                role_dict['user_capabilities'] = {'unattach': requesting_user.can_access(
                    Role, 'unattach', role, user, 'members', data={}, skip_sub_obj_read_check=False)}
            else:
                # Singleton roles should not be managed from this view, as per copy/edit rework spec
                role_dict['user_capabilities'] = {'unattach': False}
            return { 'role': role_dict, 'descendant_roles': get_roles_on_resource(obj, role)}

        def format_team_role_perm(naive_team_role, permissive_role_ids):
            ret = []
            team_role = naive_team_role
            if naive_team_role.role_field == 'admin_role':
                team_role = naive_team_role.content_object.member_role
            for role in team_role.children.filter(id__in=permissive_role_ids).all():
                role_dict = {
                    'id': role.id,
                    'name': role.name,
                    'description': role.description,
                    'team_id': team_role.object_id,
                    'team_name': team_role.content_object.name,
                    'team_organization_name': team_role.content_object.organization.name,
                }
                if role.content_type is not None:
                    role_dict['resource_name'] = role.content_object.name
                    role_dict['resource_type'] = get_type_for_model(role.content_type.model_class())
                    role_dict['related'] = reverse_gfk(role.content_object, self.context.get('request'))
                    role_dict['user_capabilities'] = {'unattach': requesting_user.can_access(
                        Role, 'unattach', role, team_role, 'parents', data={}, skip_sub_obj_read_check=False)}
                else:
                    # Singleton roles should not be managed from this view, as per copy/edit rework spec
                    role_dict['user_capabilities'] = {'unattach': False}
                ret.append({ 'role': role_dict, 'descendant_roles': get_roles_on_resource(obj, team_role)})
            return ret

        team_content_type = ContentType.objects.get_for_model(Team)
        content_type = ContentType.objects.get_for_model(obj)

        direct_permissive_role_ids = Role.objects.filter(content_type=content_type, object_id=obj.id).values_list('id', flat=True)
        all_permissive_role_ids = Role.objects.filter(content_type=content_type, object_id=obj.id).values_list('ancestors__id', flat=True)

        direct_access_roles   = user.roles \
                                    .filter(id__in=direct_permissive_role_ids).all()

        direct_team_roles     = Role.objects \
                                    .filter(content_type=team_content_type,
                                            members=user,
                                            children__in=direct_permissive_role_ids)
        if content_type == team_content_type:
            # When looking at the access list for a team, exclude the entries
            # for that team. This exists primarily so we don't list the read role
            # as a direct role when a user is a member or admin of a team
            direct_team_roles = direct_team_roles.exclude(
                children__content_type=team_content_type,
                children__object_id=obj.id
            )


        indirect_team_roles   = Role.objects \
                                    .filter(content_type=team_content_type,
                                            members=user,
                                            children__in=all_permissive_role_ids) \
                                    .exclude(id__in=direct_team_roles)

        indirect_access_roles = user.roles \
                                    .filter(id__in=all_permissive_role_ids)     \
                                    .exclude(id__in=direct_permissive_role_ids) \
                                    .exclude(id__in=direct_team_roles)          \
                                    .exclude(id__in=indirect_team_roles)

        ret['summary_fields']['direct_access'] \
            = [format_role_perm(r) for r in direct_access_roles.distinct()] \
            + [y for x in (format_team_role_perm(r, direct_permissive_role_ids) for r in direct_team_roles.distinct()) for y in x] \
            + [y for x in (format_team_role_perm(r, all_permissive_role_ids) for r in indirect_team_roles.distinct()) for y in x]

        ret['summary_fields']['indirect_access'] \
            = [format_role_perm(r) for r in indirect_access_roles.distinct()]

        return ret


class CredentialTypeSerializer(BaseSerializer):
    show_capabilities = ['edit', 'delete']
    managed_by_tower = serializers.ReadOnlyField()

    class Meta:
        model = CredentialType
        fields = ('*', 'kind', 'namespace', 'name', 'managed_by_tower', 'inputs',
                  'injectors')

    def validate(self, attrs):
        if self.instance and self.instance.managed_by_tower:
            raise PermissionDenied(
                detail=_("Modifications not allowed for managed credential types")
            )

        old_inputs = {}
        if self.instance:
            old_inputs = copy.deepcopy(self.instance.inputs)

        ret = super(CredentialTypeSerializer, self).validate(attrs)

        if self.instance and self.instance.credentials.exists():
            if 'inputs' in attrs and old_inputs != self.instance.inputs:
                raise PermissionDenied(
                    detail= _("Modifications to inputs are not allowed for credential types that are in use")
                )

        if 'kind' in attrs and attrs['kind'] not in ('cloud', 'net'):
            raise serializers.ValidationError({
                "kind": _("Must be 'cloud' or 'net', not %s") % attrs['kind']
            })

        fields = attrs.get('inputs', {}).get('fields', [])
        for field in fields:
            if field.get('ask_at_runtime', False):
                raise serializers.ValidationError({"inputs": _("'ask_at_runtime' is not supported for custom credentials.")})

        return ret

    def get_related(self, obj):
        res = super(CredentialTypeSerializer, self).get_related(obj)
        res['credentials'] = self.reverse(
            'api:credential_type_credential_list',
            kwargs={'pk': obj.pk}
        )
        res['activity_stream'] = self.reverse(
            'api:credential_type_activity_stream_list',
            kwargs={'pk': obj.pk}
        )
        return res

    def to_representation(self, data):
        value = super(CredentialTypeSerializer, self).to_representation(data)

        # translate labels and help_text for credential fields "managed by Tower"
        if value.get('managed_by_tower'):
            value['name'] = _(value['name'])
            for field in value.get('inputs', {}).get('fields', []):
                field['label'] = _(field['label'])
                if 'help_text' in field:
                    field['help_text'] = _(field['help_text'])
        return value

    def filter_field_metadata(self, fields, method):
        # API-created/modified CredentialType kinds are limited to
        # `cloud` and `net`
        if method in ('PUT', 'POST'):
            fields['kind']['choices'] = list(filter(
                lambda choice: choice[0] in ('cloud', 'net'),
                fields['kind']['choices']
            ))
        return fields


class CredentialSerializer(BaseSerializer):
    show_capabilities = ['edit', 'delete', 'copy', 'use']
    capabilities_prefetch = ['admin', 'use']
    managed_by_tower = serializers.ReadOnlyField()

    class Meta:
        model = Credential
        fields = ('*', 'organization', 'credential_type', 'managed_by_tower', 'inputs', 'kind', 'cloud', 'kubernetes')
        extra_kwargs = {
            'credential_type': {
                'label': _('Credential Type'),
            },
        }

    def to_representation(self, data):
        value = super(CredentialSerializer, self).to_representation(data)

        if 'inputs' in value:
            value['inputs'] = data.display_inputs()
        return value

    def get_related(self, obj):
        res = super(CredentialSerializer, self).get_related(obj)

        if obj.organization:
            res['organization'] = self.reverse('api:organization_detail', kwargs={'pk': obj.organization.pk})

        res.update(dict(
            activity_stream = self.reverse('api:credential_activity_stream_list', kwargs={'pk': obj.pk}),
            access_list = self.reverse('api:credential_access_list', kwargs={'pk': obj.pk}),
            object_roles = self.reverse('api:credential_object_roles_list', kwargs={'pk': obj.pk}),
            owner_users = self.reverse('api:credential_owner_users_list', kwargs={'pk': obj.pk}),
            owner_teams = self.reverse('api:credential_owner_teams_list', kwargs={'pk': obj.pk}),
            copy = self.reverse('api:credential_copy', kwargs={'pk': obj.pk}),
            input_sources = self.reverse('api:credential_input_source_sublist', kwargs={'pk': obj.pk}),
            credential_type = self.reverse('api:credential_type_detail', kwargs={'pk': obj.credential_type.pk}),
        ))

        parents = [role for role in obj.admin_role.parents.all() if role.object_id is not None]
        if parents:
            res.update({parents[0].content_type.name:parents[0].content_object.get_absolute_url(self.context.get('request'))})
        elif len(obj.admin_role.members.all()) > 0:
            user = obj.admin_role.members.all()[0]
            res.update({'user': self.reverse('api:user_detail', kwargs={'pk': user.pk})})

        return res

    def get_summary_fields(self, obj):
        summary_dict = super(CredentialSerializer, self).get_summary_fields(obj)
        summary_dict['owners'] = []

        for user in obj.admin_role.members.all():
            summary_dict['owners'].append({
                'id': user.pk,
                'type': 'user',
                'name': user.username,
                'description': ' '.join([user.first_name, user.last_name]),
                'url': self.reverse('api:user_detail', kwargs={'pk': user.pk}),
            })

        for parent in [role for role in obj.admin_role.parents.all() if role.object_id is not None]:
            summary_dict['owners'].append({
                'id': parent.content_object.pk,
                'type': camelcase_to_underscore(parent.content_object.__class__.__name__),
                'name': parent.content_object.name,
                'description': parent.content_object.description,
                'url': parent.content_object.get_absolute_url(self.context.get('request')),
            })

        return summary_dict

    def validate(self, attrs):
        if self.instance and self.instance.managed_by_tower:
            raise PermissionDenied(
                detail=_("Modifications not allowed for managed credentials")
            )
        return super(CredentialSerializer, self).validate(attrs)

    def get_validation_exclusions(self, obj=None):
        ret = super(CredentialSerializer, self).get_validation_exclusions(obj)
        for field in ('credential_type', 'inputs'):
            if field in ret:
                ret.remove(field)
        return ret

    def validate_organization(self, org):
        if (
            self.instance and
            self.instance.credential_type.kind == 'galaxy' and
            org is None
        ):
            raise serializers.ValidationError(_(
                "Galaxy credentials must be owned by an Organization."
            ))
        return org

    def validate_credential_type(self, credential_type):
        if self.instance and credential_type.pk != self.instance.credential_type.pk:
            for related_objects in (
                'ad_hoc_commands',
                'insights_inventories',
                'unifiedjobs',
                'unifiedjobtemplates',
                'projects',
                'projectupdates',
                'workflowjobnodes'
            ):
                if getattr(self.instance, related_objects).count() > 0:
                    raise ValidationError(
                        _('You cannot change the credential type of the credential, as it may break the functionality'
                          ' of the resources using it.'),
                    )

        return credential_type


class CredentialSerializerCreate(CredentialSerializer):

    user = serializers.PrimaryKeyRelatedField(
        queryset=User.objects.all(),
        required=False, default=None, write_only=True, allow_null=True,
        help_text=_('Write-only field used to add user to owner role. If provided, '
                    'do not give either team or organization. Only valid for creation.'))
    team = serializers.PrimaryKeyRelatedField(
        queryset=Team.objects.all(),
        required=False, default=None, write_only=True, allow_null=True,
        help_text=_('Write-only field used to add team to owner role. If provided, '
                    'do not give either user or organization. Only valid for creation.'))
    organization = serializers.PrimaryKeyRelatedField(
        queryset=Organization.objects.all(),
        required=False, default=None, allow_null=True,
        help_text=_('Inherit permissions from organization roles. If provided on creation, '
                    'do not give either user or team.'))

    class Meta:
        model = Credential
        fields = ('*', 'user', 'team')

    def validate(self, attrs):
        owner_fields = set()
        for field in ('user', 'team', 'organization'):
            if field in attrs:
                if attrs[field]:
                    owner_fields.add(field)
                else:
                    attrs.pop(field)

        if not owner_fields:
            raise serializers.ValidationError({"detail": _("Missing 'user', 'team', or 'organization'.")})

        if len(owner_fields) > 1:
            received = ", ".join(sorted(owner_fields))
            raise serializers.ValidationError({"detail": _(
                "Only one of 'user', 'team', or 'organization' should be provided, "
                "received {} fields.".format(received)
            )})

        if attrs.get('team'):
            attrs['organization'] = attrs['team'].organization

        if (
            'credential_type' in attrs and
            attrs['credential_type'].kind == 'galaxy' and
            list(owner_fields) != ['organization']
        ):
            raise serializers.ValidationError({"organization": _(
                "Galaxy credentials must be owned by an Organization."
            )})

        return super(CredentialSerializerCreate, self).validate(attrs)

    def create(self, validated_data):
        user = validated_data.pop('user', None)
        team = validated_data.pop('team', None)

        credential = super(CredentialSerializerCreate, self).create(validated_data)

        if user:
            credential.admin_role.members.add(user)
        if team:
            if not credential.organization or team.organization.id != credential.organization.id:
                raise serializers.ValidationError({"detail": _("Credential organization must be set and match before assigning to a team")})
            credential.admin_role.parents.add(team.admin_role)
            credential.use_role.parents.add(team.member_role)
        return credential


class CredentialInputSourceSerializer(BaseSerializer):
    show_capabilities = ['delete']

    class Meta:
        model = CredentialInputSource
        fields = (
            '*',
            'input_field_name',
            'metadata',
            'target_credential',
            'source_credential',
            '-name',
        )
        extra_kwargs = {
            'input_field_name': {'required': True},
            'target_credential': {'required': True},
            'source_credential': {'required': True},
        }

    def get_related(self, obj):
        res = super(CredentialInputSourceSerializer, self).get_related(obj)
        res['source_credential'] = obj.source_credential.get_absolute_url(request=self.context.get('request'))
        res['target_credential'] = obj.target_credential.get_absolute_url(request=self.context.get('request'))
        return res


class UserCredentialSerializerCreate(CredentialSerializerCreate):

    class Meta:
        model = Credential
        fields = ('*', '-team', '-organization')


class TeamCredentialSerializerCreate(CredentialSerializerCreate):

    class Meta:
        model = Credential
        fields = ('*', '-user', '-organization')


class OrganizationCredentialSerializerCreate(CredentialSerializerCreate):

    class Meta:
        model = Credential
        fields = ('*', '-user', '-team')


class LabelsListMixin(object):

    def _summary_field_labels(self, obj):
        label_list = [{'id': x.id, 'name': x.name} for x in obj.labels.all()[:10]]
        if has_model_field_prefetched(obj, 'labels'):
            label_ct = len(obj.labels.all())
        else:
            if len(label_list) < 10:
                label_ct = len(label_list)
            else:
                label_ct = obj.labels.count()
        return {'count': label_ct, 'results': label_list}

    def get_summary_fields(self, obj):
        res = super(LabelsListMixin, self).get_summary_fields(obj)
        res['labels'] = self._summary_field_labels(obj)
        return res


class JobOptionsSerializer(LabelsListMixin, BaseSerializer):

    class Meta:
        fields = ('*', 'job_type', 'inventory', 'project', 'playbook', 'scm_branch',
                  'forks', 'limit', 'verbosity', 'extra_vars', 'job_tags',
                  'force_handlers', 'skip_tags', 'start_at_task', 'timeout',
                  'use_fact_cache', 'organization',)
        read_only_fields = ('organization',)

    def get_related(self, obj):
        res = super(JobOptionsSerializer, self).get_related(obj)
        res['labels'] = self.reverse('api:job_template_label_list', kwargs={'pk': obj.pk})
        try:
            if obj.inventory:
                res['inventory'] = self.reverse('api:inventory_detail', kwargs={'pk': obj.inventory.pk})
        except ObjectDoesNotExist:
            setattr(obj, 'inventory', None)
        try:
            if obj.project:
                res['project'] = self.reverse('api:project_detail', kwargs={'pk': obj.project.pk})
        except ObjectDoesNotExist:
            setattr(obj, 'project', None)
        if obj.organization_id:
            res['organization'] = self.reverse('api:organization_detail', kwargs={'pk': obj.organization_id})
        if isinstance(obj, UnifiedJobTemplate):
            res['credentials'] = self.reverse(
                'api:job_template_credentials_list',
                kwargs={'pk': obj.pk}
            )
        elif isinstance(obj, UnifiedJob):
            res['credentials'] = self.reverse('api:job_credentials_list', kwargs={'pk': obj.pk})

        return res

    def to_representation(self, obj):
        ret = super(JobOptionsSerializer, self).to_representation(obj)
        if obj is None:
            return ret
        if 'inventory' in ret and not obj.inventory:
            ret['inventory'] = None
        if 'project' in ret and not obj.project:
            ret['project'] = None
            if 'playbook' in ret:
                ret['playbook'] = ''
        return ret

    def validate(self, attrs):
        if 'project' in self.fields and 'playbook' in self.fields:
            project = attrs.get('project', self.instance.project if self.instance else None)
            playbook = attrs.get('playbook', self.instance and self.instance.playbook or '')
            scm_branch = attrs.get('scm_branch', self.instance.scm_branch if self.instance else None)
            ask_scm_branch_on_launch = attrs.get(
                'ask_scm_branch_on_launch', self.instance.ask_scm_branch_on_launch if self.instance else None)
            if not project:
                raise serializers.ValidationError({'project': _('This field is required.')})
            playbook_not_found = bool(
                (
                    project and project.scm_type and (not project.allow_override) and
                    playbook and force_text(playbook) not in project.playbook_files
                ) or
                (project and not project.scm_type and playbook and force_text(playbook) not in project.playbooks)  # manual
            )
            if playbook_not_found:
                raise serializers.ValidationError({'playbook': _('Playbook not found for project.')})
            if project and not playbook:
                raise serializers.ValidationError({'playbook': _('Must select playbook for project.')})
            if scm_branch and not project.allow_override:
                raise serializers.ValidationError({'scm_branch': _('Project does not allow overriding branch.')})
            if ask_scm_branch_on_launch and not project.allow_override:
                raise serializers.ValidationError({'ask_scm_branch_on_launch': _('Project does not allow overriding branch.')})

        ret = super(JobOptionsSerializer, self).validate(attrs)
        return ret


class JobTemplateMixin(object):
    '''
    Provide recent jobs and survey details in summary_fields
    '''

    def _recent_jobs(self, obj):
        # Exclude "joblets", jobs that ran as part of a sliced workflow job
        uj_qs = obj.unifiedjob_unified_jobs.exclude(job__job_slice_count__gt=1).order_by('-created')
        # Would like to apply an .only, but does not play well with non_polymorphic
        # .only('id', 'status', 'finished', 'polymorphic_ctype_id')
        optimized_qs = uj_qs.non_polymorphic()
        return [{
            'id': x.id, 'status': x.status, 'finished': x.finished, 'canceled_on': x.canceled_on,
            # Make type consistent with API top-level key, for instance workflow_job
            'type': x.job_type_name
        } for x in optimized_qs[:10]]

    def get_summary_fields(self, obj):
        d = super(JobTemplateMixin, self).get_summary_fields(obj)
        if obj.survey_spec is not None and ('name' in obj.survey_spec and 'description' in obj.survey_spec):
            d['survey'] = dict(title=obj.survey_spec['name'], description=obj.survey_spec['description'])
        d['recent_jobs'] = self._recent_jobs(obj)
        return d

    def validate(self, attrs):
        webhook_service = attrs.get('webhook_service', getattr(self.instance, 'webhook_service', None))
        webhook_credential = attrs.get('webhook_credential', getattr(self.instance, 'webhook_credential', None))

        if webhook_credential:
            if webhook_credential.credential_type.kind != 'token':
                raise serializers.ValidationError({
                    'webhook_credential': _("Must be a Personal Access Token."),
                })

            msg = {'webhook_credential': _("Must match the selected webhook service.")}
            if webhook_service:
                if webhook_credential.credential_type.namespace != '{}_token'.format(webhook_service):
                    raise serializers.ValidationError(msg)
            else:
                raise serializers.ValidationError(msg)

        return super().validate(attrs)


class JobTemplateSerializer(JobTemplateMixin, UnifiedJobTemplateSerializer, JobOptionsSerializer):
    show_capabilities = ['start', 'schedule', 'copy', 'edit', 'delete']
    capabilities_prefetch = [
        'admin', 'execute',
        {'copy': ['project.use', 'inventory.use']}
    ]

    status = serializers.ChoiceField(choices=JobTemplate.JOB_TEMPLATE_STATUS_CHOICES, read_only=True, required=False)

    class Meta:
        model = JobTemplate
        fields = (
            '*', 'host_config_key', 'ask_scm_branch_on_launch', 'ask_diff_mode_on_launch',
            'ask_variables_on_launch', 'ask_limit_on_launch', 'ask_tags_on_launch',
            'ask_skip_tags_on_launch', 'ask_job_type_on_launch', 'ask_verbosity_on_launch',
            'ask_inventory_on_launch', 'ask_credential_on_launch', 'survey_enabled',
            'become_enabled', 'diff_mode', 'allow_simultaneous', 'custom_virtualenv',
            'job_slice_count', 'webhook_service', 'webhook_credential',
        )

    def get_related(self, obj):
        res = super(JobTemplateSerializer, self).get_related(obj)
        res.update(
            jobs=self.reverse('api:job_template_jobs_list', kwargs={'pk': obj.pk}),
            schedules=self.reverse('api:job_template_schedules_list', kwargs={'pk': obj.pk}),
            activity_stream=self.reverse('api:job_template_activity_stream_list', kwargs={'pk': obj.pk}),
            launch=self.reverse('api:job_template_launch', kwargs={'pk': obj.pk}),
            webhook_key=self.reverse('api:webhook_key', kwargs={'model_kwarg': 'job_templates', 'pk': obj.pk}),
            webhook_receiver=(
                self.reverse('api:webhook_receiver_{}'.format(obj.webhook_service),
                             kwargs={'model_kwarg': 'job_templates', 'pk': obj.pk})
                if obj.webhook_service else ''
            ),
            notification_templates_started=self.reverse('api:job_template_notification_templates_started_list', kwargs={'pk': obj.pk}),
            notification_templates_success=self.reverse('api:job_template_notification_templates_success_list', kwargs={'pk': obj.pk}),
            notification_templates_error=self.reverse('api:job_template_notification_templates_error_list', kwargs={'pk': obj.pk}),
            access_list=self.reverse('api:job_template_access_list',      kwargs={'pk': obj.pk}),
            survey_spec=self.reverse('api:job_template_survey_spec', kwargs={'pk': obj.pk}),
            labels=self.reverse('api:job_template_label_list', kwargs={'pk': obj.pk}),
            object_roles=self.reverse('api:job_template_object_roles_list', kwargs={'pk': obj.pk}),
            instance_groups=self.reverse('api:job_template_instance_groups_list', kwargs={'pk': obj.pk}),
            slice_workflow_jobs=self.reverse('api:job_template_slice_workflow_jobs_list', kwargs={'pk': obj.pk}),
            copy=self.reverse('api:job_template_copy', kwargs={'pk': obj.pk}),
        )
        if obj.host_config_key:
            res['callback'] = self.reverse('api:job_template_callback', kwargs={'pk': obj.pk})
        if obj.organization_id:
            res['organization'] = self.reverse('api:organization_detail',   kwargs={'pk': obj.organization_id})
        if obj.webhook_credential_id:
            res['webhook_credential'] = self.reverse('api:credential_detail', kwargs={'pk': obj.webhook_credential_id})
        return res

    def validate(self, attrs):
        def get_field_from_model_or_attrs(fd):
            return attrs.get(fd, self.instance and getattr(self.instance, fd) or None)

        inventory = get_field_from_model_or_attrs('inventory')
        project = get_field_from_model_or_attrs('project')

        if get_field_from_model_or_attrs('host_config_key') and not inventory:
            raise serializers.ValidationError({'host_config_key': _(
                "Cannot enable provisioning callback without an inventory set."
            )})

        prompting_error_message = _("Must either set a default value or ask to prompt on launch.")
        if project is None:
            raise serializers.ValidationError({'project': _("Job Templates must have a project assigned.")})
        elif inventory is None and not get_field_from_model_or_attrs('ask_inventory_on_launch'):
            raise serializers.ValidationError({'inventory': prompting_error_message})

        return super(JobTemplateSerializer, self).validate(attrs)

    def validate_extra_vars(self, value):
        return vars_validate_or_raise(value)

    def get_summary_fields(self, obj):
        summary_fields = super(JobTemplateSerializer, self).get_summary_fields(obj)
        all_creds = []
        # Organize credential data into multitude of deprecated fields
        if obj.pk:
            for cred in obj.credentials.all():
                summarized_cred = {
                    'id': cred.pk,
                    'name': cred.name,
                    'description': cred.description,
                    'kind': cred.kind,
                    'cloud': cred.credential_type.kind == 'cloud'
                }
                all_creds.append(summarized_cred)
        summary_fields['credentials'] = all_creds
        return summary_fields


class JobTemplateWithSpecSerializer(JobTemplateSerializer):
    '''
    Used for activity stream entries.
    '''

    class Meta:
        model = JobTemplate
        fields = ('*', 'survey_spec')


class JobSerializer(UnifiedJobSerializer, JobOptionsSerializer):

    passwords_needed_to_start = serializers.ReadOnlyField()
    artifacts = serializers.SerializerMethodField()

    class Meta:
        model = Job
        fields = (
            '*', 'job_template', 'passwords_needed_to_start', 'allow_simultaneous',
            'artifacts', 'scm_revision', 'instance_group', 'diff_mode', 'job_slice_number',
            'job_slice_count', 'webhook_service', 'webhook_credential', 'webhook_guid',
        )

    def get_related(self, obj):
        res = super(JobSerializer, self).get_related(obj)
        res.update(dict(
            job_events  = self.reverse('api:job_job_events_list', kwargs={'pk': obj.pk}),
            job_host_summaries = self.reverse('api:job_job_host_summaries_list', kwargs={'pk': obj.pk}),
            activity_stream = self.reverse('api:job_activity_stream_list', kwargs={'pk': obj.pk}),
            notifications = self.reverse('api:job_notifications_list', kwargs={'pk': obj.pk}),
            labels = self.reverse('api:job_label_list', kwargs={'pk': obj.pk}),
            create_schedule = self.reverse('api:job_create_schedule', kwargs={'pk': obj.pk}),
        ))
        try:
            if obj.job_template:
                res['job_template'] = self.reverse('api:job_template_detail',
                                                   kwargs={'pk': obj.job_template.pk})
        except ObjectDoesNotExist:
            setattr(obj, 'job_template', None)
        if obj.can_cancel or True:
            res['cancel'] = self.reverse('api:job_cancel', kwargs={'pk': obj.pk})
        try:
            if obj.project_update:
                res['project_update'] = self.reverse(
                    'api:project_update_detail', kwargs={'pk': obj.project_update.pk}
                )
        except ObjectDoesNotExist:
            pass
        res['relaunch'] = self.reverse('api:job_relaunch', kwargs={'pk': obj.pk})
        return res

    def get_artifacts(self, obj):
        if obj:
            return obj.display_artifacts()
        return {}

    def to_representation(self, obj):
        ret = super(JobSerializer, self).to_representation(obj)
        if obj is None:
            return ret
        if 'job_template' in ret and not obj.job_template:
            ret['job_template'] = None
        if 'extra_vars' in ret:
            ret['extra_vars'] = obj.display_extra_vars()
        return ret

    def get_summary_fields(self, obj):
        summary_fields = super(JobSerializer, self).get_summary_fields(obj)
        all_creds = []
        # Organize credential data into multitude of deprecated fields
        if obj.pk:
            for cred in obj.credentials.all():
                summarized_cred = {
                    'id': cred.pk,
                    'name': cred.name,
                    'description': cred.description,
                    'kind': cred.kind,
                    'cloud': cred.credential_type.kind == 'cloud'
                }
                all_creds.append(summarized_cred)
        summary_fields['credentials'] = all_creds
        return summary_fields


class JobDetailSerializer(JobSerializer):

    host_status_counts = serializers.SerializerMethodField(
        help_text=_('A count of hosts uniquely assigned to each status.'),
    )
    playbook_counts = serializers.SerializerMethodField(
        help_text=_('A count of all plays and tasks for the job run.'),
    )
    custom_virtualenv = serializers.ReadOnlyField()

    class Meta:
        model = Job
        fields = ('*', 'host_status_counts', 'playbook_counts', 'custom_virtualenv')

    def get_playbook_counts(self, obj):
        task_count = obj.job_events.filter(event='playbook_on_task_start').count()
        play_count = obj.job_events.filter(event='playbook_on_play_start').count()

        data = {'play_count': play_count, 'task_count': task_count}

        return data

    def get_host_status_counts(self, obj):
        try:
            counts = obj.job_events.only('event_data').get(event='playbook_on_stats').get_host_status_counts()
        except JobEvent.DoesNotExist:
            counts = {}

        return counts


class JobCancelSerializer(BaseSerializer):

    can_cancel = serializers.BooleanField(read_only=True)

    class Meta:
        model = Job
        fields = ('can_cancel',)


class JobRelaunchSerializer(BaseSerializer):

    passwords_needed_to_start = serializers.SerializerMethodField()
    retry_counts = serializers.SerializerMethodField()
    hosts = serializers.ChoiceField(
        required=False, allow_null=True, default='all',
        choices=[
            ('all', _('No change to job limit')),
            ('failed', _('All failed and unreachable hosts'))
        ],
        write_only=True
    )
    credential_passwords = VerbatimField(required=True, write_only=True)

    class Meta:
        model = Job
        fields = ('passwords_needed_to_start', 'retry_counts', 'hosts', 'credential_passwords',)

    def validate_credential_passwords(self, value):
        pnts = self.instance.passwords_needed_to_start
        missing = set(pnts) - set(key for key in value if value[key])
        if missing:
            raise serializers.ValidationError(_(
                'Missing passwords needed to start: {}'.format(', '.join(missing))
            ))
        return value

    def to_representation(self, obj):
        res = super(JobRelaunchSerializer, self).to_representation(obj)
        view = self.context.get('view', None)
        if hasattr(view, '_raw_data_form_marker'):
            password_keys = dict([(p, u'') for p in self.get_passwords_needed_to_start(obj)])
            res.update(password_keys)
        return res

    def get_passwords_needed_to_start(self, obj):
        if obj:
            return obj.passwords_needed_to_start
        return ''

    def get_retry_counts(self, obj):
        if obj.status in ACTIVE_STATES:
            return _('Relaunch by host status not available until job finishes running.')
        data = OrderedDict([])
        for status in self.fields['hosts'].choices.keys():
            data[status] = obj.retry_qs(status).count()
        return data

    def get_validation_exclusions(self, *args, **kwargs):
        r = super(JobRelaunchSerializer, self).get_validation_exclusions(*args, **kwargs)
        r.append('credential_passwords')
        return r

    def validate(self, attrs):
        obj = self.instance
        if obj.project is None:
            raise serializers.ValidationError(dict(errors=[_("Job Template Project is missing or undefined.")]))
        if obj.inventory is None or obj.inventory.pending_deletion:
            raise serializers.ValidationError(dict(errors=[_("Job Template Inventory is missing or undefined.")]))
        attrs = super(JobRelaunchSerializer, self).validate(attrs)
        return attrs


class JobCreateScheduleSerializer(BaseSerializer):

    can_schedule = serializers.SerializerMethodField()
    prompts = serializers.SerializerMethodField()

    class Meta:
        model = Job
        fields = ('can_schedule', 'prompts',)

    def get_can_schedule(self, obj):
        '''
        Need both a job template and job prompts to schedule
        '''
        return obj.can_schedule

    @staticmethod
    def _summarize(res_name, obj):
        summary = {}
        for field in SUMMARIZABLE_FK_FIELDS[res_name]:
            summary[field] = getattr(obj, field, None)
        return summary

    def get_prompts(self, obj):
        try:
            config = obj.launch_config
            ret = config.prompts_dict(display=True)
            if 'inventory' in ret:
                ret['inventory'] = self._summarize('inventory', ret['inventory'])
            if 'credentials' in ret:
                all_creds = [self._summarize('credential', cred) for cred in ret['credentials']]
                ret['credentials'] = all_creds
            return ret
        except JobLaunchConfig.DoesNotExist:
            return {'all': _('Unknown, job may have been ran before launch configurations were saved.')}


class AdHocCommandSerializer(UnifiedJobSerializer):

    class Meta:
        model = AdHocCommand
        fields = ('*', 'job_type', 'inventory', 'limit', 'credential',
                  'module_name', 'module_args', 'forks', 'verbosity', 'extra_vars',
                  'become_enabled', 'diff_mode', '-unified_job_template', '-description')
        extra_kwargs = {
            'name': {
                'read_only': True,
            },
        }

    def get_field_names(self, declared_fields, info):
        field_names = super(AdHocCommandSerializer, self).get_field_names(declared_fields, info)
        # Meta multiple inheritance and -field_name options don't seem to be
        # taking effect above, so remove the undesired fields here.
        return tuple(x for x in field_names if x not in ('unified_job_template', 'description'))

    def build_standard_field(self, field_name, model_field):
        field_class, field_kwargs = super(AdHocCommandSerializer, self).build_standard_field(field_name, model_field)
        # Load module name choices dynamically from DB settings.
        if field_name == 'module_name':
            field_class = serializers.ChoiceField
            module_name_choices = [(x, x) for x in settings.AD_HOC_COMMANDS]
            module_name_default = 'command' if 'command' in [x[0] for x in module_name_choices] else ''
            field_kwargs['choices'] = module_name_choices
            field_kwargs['required'] = bool(not module_name_default)
            field_kwargs['default'] = module_name_default or serializers.empty
            field_kwargs['allow_blank'] = False
            field_kwargs.pop('max_length', None)
        return field_class, field_kwargs

    def get_related(self, obj):
        res = super(AdHocCommandSerializer, self).get_related(obj)
        if obj.inventory_id:
            res['inventory'] = self.reverse('api:inventory_detail', kwargs={'pk': obj.inventory_id})
        if obj.credential_id:
            res['credential'] = self.reverse('api:credential_detail', kwargs={'pk': obj.credential_id})
        res.update(dict(
            events  = self.reverse('api:ad_hoc_command_ad_hoc_command_events_list', kwargs={'pk': obj.pk}),
            activity_stream = self.reverse('api:ad_hoc_command_activity_stream_list', kwargs={'pk': obj.pk}),
            notifications = self.reverse('api:ad_hoc_command_notifications_list', kwargs={'pk': obj.pk}),
        ))
        res['cancel'] = self.reverse('api:ad_hoc_command_cancel', kwargs={'pk': obj.pk})
        res['relaunch'] = self.reverse('api:ad_hoc_command_relaunch', kwargs={'pk': obj.pk})
        return res

    def to_representation(self, obj):
        ret = super(AdHocCommandSerializer, self).to_representation(obj)
        if 'inventory' in ret and not obj.inventory_id:
            ret['inventory'] = None
        if 'credential' in ret and not obj.credential_id:
            ret['credential'] = None
        # For the UI, only module_name is returned for name, instead of the
        # longer module name + module_args format.
        if 'name' in ret:
            ret['name'] = obj.module_name
        return ret

    def validate(self, attrs):
        ret = super(AdHocCommandSerializer, self).validate(attrs)
        return ret

    def validate_extra_vars(self, value):
        redacted_extra_vars, removed_vars = extract_ansible_vars(value)
        if removed_vars:
            raise serializers.ValidationError(_(
                "{} are prohibited from use in ad hoc commands."
            ).format(", ".join(sorted(removed_vars, reverse=True))))
        return vars_validate_or_raise(value)


class AdHocCommandDetailSerializer(AdHocCommandSerializer):

    host_status_counts = serializers.SerializerMethodField(
        help_text=_('A count of hosts uniquely assigned to each status.'),
    )

    class Meta:
        model = AdHocCommand
        fields = ('*', 'host_status_counts',)

    def get_host_status_counts(self, obj):
        try:
            counts = obj.ad_hoc_command_events.only('event_data').get(event='playbook_on_stats').get_host_status_counts()
        except AdHocCommandEvent.DoesNotExist:
            counts = {}

        return counts


class AdHocCommandCancelSerializer(AdHocCommandSerializer):

    can_cancel = serializers.BooleanField(read_only=True)

    class Meta:
        fields = ('can_cancel',)


class AdHocCommandRelaunchSerializer(AdHocCommandSerializer):

    class Meta:
        fields = ()

    def to_representation(self, obj):
        if obj:
            return dict([(p, u'') for p in obj.passwords_needed_to_start])
        else:
            return {}


class SystemJobTemplateSerializer(UnifiedJobTemplateSerializer):

    class Meta:
        model = SystemJobTemplate
        fields = ('*', 'job_type',)

    def get_related(self, obj):
        res = super(SystemJobTemplateSerializer, self).get_related(obj)
        res.update(dict(
            jobs = self.reverse('api:system_job_template_jobs_list', kwargs={'pk': obj.pk}),
            schedules = self.reverse('api:system_job_template_schedules_list', kwargs={'pk': obj.pk}),
            launch = self.reverse('api:system_job_template_launch', kwargs={'pk': obj.pk}),
            notification_templates_started = self.reverse('api:system_job_template_notification_templates_started_list', kwargs={'pk': obj.pk}),
            notification_templates_success = self.reverse('api:system_job_template_notification_templates_success_list', kwargs={'pk': obj.pk}),
            notification_templates_error = self.reverse('api:system_job_template_notification_templates_error_list', kwargs={'pk': obj.pk}),

        ))
        return res


class SystemJobSerializer(UnifiedJobSerializer):

    result_stdout = serializers.SerializerMethodField()

    class Meta:
        model = SystemJob
        fields = ('*', 'system_job_template', 'job_type', 'extra_vars', 'result_stdout', '-controller_node',)

    def get_related(self, obj):
        res = super(SystemJobSerializer, self).get_related(obj)
        if obj.system_job_template:
            res['system_job_template'] = self.reverse('api:system_job_template_detail',
                                                      kwargs={'pk': obj.system_job_template.pk})
            res['notifications'] = self.reverse('api:system_job_notifications_list', kwargs={'pk': obj.pk})
        if obj.can_cancel or True:
            res['cancel'] = self.reverse('api:system_job_cancel', kwargs={'pk': obj.pk})
        res['events'] = self.reverse('api:system_job_events_list', kwargs={'pk': obj.pk})
        return res

    def get_result_stdout(self, obj):
        try:
            return obj.result_stdout
        except StdoutMaxBytesExceeded as e:
            return _(
                "Standard Output too large to display ({text_size} bytes), "
                "only download supported for sizes over {supported_size} bytes.").format(
                    text_size=e.total, supported_size=e.supported
            )


class SystemJobCancelSerializer(SystemJobSerializer):

    can_cancel = serializers.BooleanField(read_only=True)

    class Meta:
        fields = ('can_cancel',)


class WorkflowJobTemplateSerializer(JobTemplateMixin, LabelsListMixin, UnifiedJobTemplateSerializer):
    show_capabilities = ['start', 'schedule', 'edit', 'copy', 'delete']
    capabilities_prefetch = [
        'admin', 'execute',
        {'copy': 'organization.workflow_admin'}
    ]
    limit = serializers.CharField(allow_blank=True, allow_null=True, required=False, default=None)
    scm_branch = serializers.CharField(allow_blank=True, allow_null=True, required=False, default=None)

    class Meta:
        model = WorkflowJobTemplate
        fields = (
            '*', 'extra_vars', 'organization', 'survey_enabled', 'allow_simultaneous',
            'ask_variables_on_launch', 'inventory', 'limit', 'scm_branch',
            'ask_inventory_on_launch', 'ask_scm_branch_on_launch', 'ask_limit_on_launch',
            'webhook_service', 'webhook_credential',
        )

    def get_related(self, obj):
        res = super(WorkflowJobTemplateSerializer, self).get_related(obj)
        res.update(
            workflow_jobs = self.reverse('api:workflow_job_template_jobs_list', kwargs={'pk': obj.pk}),
            schedules = self.reverse('api:workflow_job_template_schedules_list', kwargs={'pk': obj.pk}),
            launch = self.reverse('api:workflow_job_template_launch', kwargs={'pk': obj.pk}),
            webhook_key=self.reverse('api:webhook_key', kwargs={'model_kwarg': 'workflow_job_templates', 'pk': obj.pk}),
            webhook_receiver=(
                self.reverse('api:webhook_receiver_{}'.format(obj.webhook_service),
                             kwargs={'model_kwarg': 'workflow_job_templates', 'pk': obj.pk})
                if obj.webhook_service else ''
            ),
            workflow_nodes = self.reverse('api:workflow_job_template_workflow_nodes_list', kwargs={'pk': obj.pk}),
            labels = self.reverse('api:workflow_job_template_label_list', kwargs={'pk': obj.pk}),
            activity_stream = self.reverse('api:workflow_job_template_activity_stream_list', kwargs={'pk': obj.pk}),
            notification_templates_started = self.reverse('api:workflow_job_template_notification_templates_started_list', kwargs={'pk': obj.pk}),
            notification_templates_success = self.reverse('api:workflow_job_template_notification_templates_success_list', kwargs={'pk': obj.pk}),
            notification_templates_error = self.reverse('api:workflow_job_template_notification_templates_error_list', kwargs={'pk': obj.pk}),
            notification_templates_approvals = self.reverse('api:workflow_job_template_notification_templates_approvals_list', kwargs={'pk': obj.pk}),
            access_list = self.reverse('api:workflow_job_template_access_list', kwargs={'pk': obj.pk}),
            object_roles = self.reverse('api:workflow_job_template_object_roles_list', kwargs={'pk': obj.pk}),
            survey_spec = self.reverse('api:workflow_job_template_survey_spec', kwargs={'pk': obj.pk}),
            copy = self.reverse('api:workflow_job_template_copy', kwargs={'pk': obj.pk}),
        )
        if obj.organization:
            res['organization'] = self.reverse('api:organization_detail',   kwargs={'pk': obj.organization.pk})
        if obj.webhook_credential_id:
            res['webhook_credential'] = self.reverse('api:credential_detail', kwargs={'pk': obj.webhook_credential_id})
        if obj.inventory_id:
            res['inventory'] = self.reverse(
                'api:inventory_detail', kwargs={
                    'pk': obj.inventory_id
                }
            )
        return res

    def validate_extra_vars(self, value):
        return vars_validate_or_raise(value)

    def validate(self, attrs):
        attrs = super(WorkflowJobTemplateSerializer, self).validate(attrs)

        # process char_prompts, these are not direct fields on the model
        mock_obj = self.Meta.model()
        for field_name in ('scm_branch', 'limit'):
            if field_name in attrs:
                setattr(mock_obj, field_name, attrs[field_name])
                attrs.pop(field_name)

        # Model `.save` needs the container dict, not the pseudo fields
        if mock_obj.char_prompts:
            attrs['char_prompts'] = mock_obj.char_prompts

        return attrs


class WorkflowJobTemplateWithSpecSerializer(WorkflowJobTemplateSerializer):
    '''
    Used for activity stream entries.
    '''

    class Meta:
        model = WorkflowJobTemplate
        fields = ('*', 'survey_spec')


class WorkflowJobSerializer(LabelsListMixin, UnifiedJobSerializer):
    limit = serializers.CharField(allow_blank=True, allow_null=True, required=False, default=None)
    scm_branch = serializers.CharField(allow_blank=True, allow_null=True, required=False, default=None)

    class Meta:
        model = WorkflowJob
        fields = (
            '*', 'workflow_job_template', 'extra_vars', 'allow_simultaneous', 'job_template',
            'is_sliced_job', '-execution_node', '-event_processing_finished', '-controller_node',
            'inventory', 'limit', 'scm_branch', 'webhook_service', 'webhook_credential', 'webhook_guid',
        )

    def get_related(self, obj):
        res = super(WorkflowJobSerializer, self).get_related(obj)
        if obj.workflow_job_template:
            res['workflow_job_template'] = self.reverse('api:workflow_job_template_detail',
                                                        kwargs={'pk': obj.workflow_job_template.pk})
            res['notifications'] = self.reverse('api:workflow_job_notifications_list', kwargs={'pk': obj.pk})
        if obj.job_template_id:
            res['job_template'] = self.reverse('api:job_template_detail', kwargs={'pk': obj.job_template_id})
        res['workflow_nodes'] = self.reverse('api:workflow_job_workflow_nodes_list', kwargs={'pk': obj.pk})
        res['labels'] = self.reverse('api:workflow_job_label_list', kwargs={'pk': obj.pk})
        res['activity_stream'] = self.reverse('api:workflow_job_activity_stream_list', kwargs={'pk': obj.pk})
        res['relaunch'] = self.reverse('api:workflow_job_relaunch', kwargs={'pk': obj.pk})
        if obj.can_cancel or True:
            res['cancel'] = self.reverse('api:workflow_job_cancel', kwargs={'pk': obj.pk})
        return res

    def to_representation(self, obj):
        ret = super(WorkflowJobSerializer, self).to_representation(obj)
        if obj is None:
            return ret
        if 'extra_vars' in ret:
            ret['extra_vars'] = obj.display_extra_vars()
        return ret


class WorkflowJobListSerializer(WorkflowJobSerializer, UnifiedJobListSerializer):

    class Meta:
        fields = ('*', '-execution_node', '-controller_node',)


class WorkflowJobCancelSerializer(WorkflowJobSerializer):

    can_cancel = serializers.BooleanField(read_only=True)

    class Meta:
        fields = ('can_cancel',)


class WorkflowApprovalViewSerializer(UnifiedJobSerializer):

    class Meta:
        model = WorkflowApproval
        fields = []


class WorkflowApprovalSerializer(UnifiedJobSerializer):

    can_approve_or_deny = serializers.SerializerMethodField()
    approval_expiration = serializers.SerializerMethodField()
    timed_out = serializers.ReadOnlyField()

    class Meta:
        model = WorkflowApproval
        fields = ('*', '-controller_node', '-execution_node', 'can_approve_or_deny', 'approval_expiration', 'timed_out',)

    def get_approval_expiration(self, obj):
        if obj.status != 'pending' or obj.timeout == 0:
            return None
        return obj.created + timedelta(seconds=obj.timeout)

    def get_can_approve_or_deny(self, obj):
        request = self.context.get('request', None)
        allowed = request.user.can_access(WorkflowApproval, 'approve_or_deny', obj)
        return allowed is True and obj.status == 'pending'

    def get_related(self, obj):
        res = super(WorkflowApprovalSerializer, self).get_related(obj)

        if obj.workflow_approval_template:
            res['workflow_approval_template'] = self.reverse('api:workflow_approval_template_detail',
                                                             kwargs={'pk': obj.workflow_approval_template.pk})
        res['approve'] = self.reverse('api:workflow_approval_approve', kwargs={'pk': obj.pk})
        res['deny'] = self.reverse('api:workflow_approval_deny', kwargs={'pk': obj.pk})
        if obj.approved_or_denied_by:
            res['approved_or_denied_by'] = self.reverse('api:user_detail', kwargs={'pk': obj.approved_or_denied_by.pk})
        return res


class WorkflowApprovalActivityStreamSerializer(WorkflowApprovalSerializer):
    """
    timed_out and status are usually read-only fields
    However, when we generate an activity stream record, we *want* to record
    these types of changes.  This serializer allows us to do so.
    """
    status = serializers.ChoiceField(choices=JobTemplate.JOB_TEMPLATE_STATUS_CHOICES)
    timed_out = serializers.BooleanField()



class WorkflowApprovalListSerializer(WorkflowApprovalSerializer, UnifiedJobListSerializer):

    class Meta:
        fields = ('*', '-controller_node', '-execution_node', 'can_approve_or_deny', 'approval_expiration', 'timed_out',)


class WorkflowApprovalTemplateSerializer(UnifiedJobTemplateSerializer):

    class Meta:
        model = WorkflowApprovalTemplate
        fields = ('*', 'timeout', 'name',)

    def get_related(self, obj):
        res = super(WorkflowApprovalTemplateSerializer, self).get_related(obj)
        if 'last_job' in res:
            del res['last_job']

        res.update(jobs = self.reverse('api:workflow_approval_template_jobs_list', kwargs={'pk': obj.pk}))
        return res


class LaunchConfigurationBaseSerializer(BaseSerializer):
    scm_branch = serializers.CharField(allow_blank=True, allow_null=True, required=False, default=None)
    job_type = serializers.ChoiceField(allow_blank=True, allow_null=True, required=False, default=None,
                                       choices=NEW_JOB_TYPE_CHOICES)
    job_tags = serializers.CharField(allow_blank=True, allow_null=True, required=False, default=None)
    limit = serializers.CharField(allow_blank=True, allow_null=True, required=False, default=None)
    skip_tags = serializers.CharField(allow_blank=True, allow_null=True, required=False, default=None)
    diff_mode = serializers.NullBooleanField(required=False, default=None)
    verbosity = serializers.ChoiceField(allow_null=True, required=False, default=None,
                                        choices=VERBOSITY_CHOICES)
    exclude_errors = ()

    class Meta:
        fields = ('*', 'extra_data', 'inventory', # Saved launch-time config fields
                  'scm_branch', 'job_type', 'job_tags', 'skip_tags', 'limit', 'skip_tags', 'diff_mode', 'verbosity')

    def get_related(self, obj):
        res = super(LaunchConfigurationBaseSerializer, self).get_related(obj)
        if obj.inventory_id:
            res['inventory'] = self.reverse('api:inventory_detail', kwargs={'pk': obj.inventory_id})
        res['credentials'] = self.reverse(
            'api:{}_credentials_list'.format(get_type_for_model(self.Meta.model)),
            kwargs={'pk': obj.pk}
        )
        return res

    def _build_mock_obj(self, attrs):
        mock_obj = self.Meta.model()
        if self.instance:
            for field in self.instance._meta.fields:
                setattr(mock_obj, field.name, getattr(self.instance, field.name))
        field_names = set(field.name for field in self.Meta.model._meta.fields)
        for field_name, value in list(attrs.items()):
            setattr(mock_obj, field_name, value)
            if field_name not in field_names:
                attrs.pop(field_name)
        return mock_obj

    def to_representation(self, obj):
        ret = super(LaunchConfigurationBaseSerializer, self).to_representation(obj)
        if obj is None:
            return ret
        if 'extra_data' in ret and obj.survey_passwords:
            ret['extra_data'] = obj.display_extra_vars()
        return ret

    def validate(self, attrs):
        db_extra_data = {}
        if self.instance:
            db_extra_data = parse_yaml_or_json(self.instance.extra_data)

        attrs = super(LaunchConfigurationBaseSerializer, self).validate(attrs)

        ujt = None
        if 'unified_job_template' in attrs:
            ujt = attrs['unified_job_template']
        elif self.instance:
            ujt = self.instance.unified_job_template
        if ujt is None:
            ret = {}
            for fd in ('workflow_job_template', 'identifier', 'all_parents_must_converge'):
                if fd in attrs:
                    ret[fd] = attrs[fd]
            return ret

        # build additional field survey_passwords to track redacted variables
        password_dict = {}
        extra_data = parse_yaml_or_json(attrs.get('extra_data', {}))
        if hasattr(ujt, 'survey_password_variables'):
            # Prepare additional field survey_passwords for save
            for key in ujt.survey_password_variables():
                if key in extra_data:
                    password_dict[key] = REPLACE_STR

        # Replace $encrypted$ submissions with db value if exists
        if 'extra_data' in attrs:
            if password_dict:
                if not self.instance or password_dict != self.instance.survey_passwords:
                    attrs['survey_passwords'] = password_dict.copy()
                # Force dict type (cannot preserve YAML formatting if passwords are involved)
                # Encrypt the extra_data for save, only current password vars in JT survey
                # but first, make a copy or else this is referenced by request.data, and
                # user could get encrypted string in form data in API browser
                attrs['extra_data'] = extra_data.copy()
                encrypt_dict(attrs['extra_data'], password_dict.keys())
                # For any raw $encrypted$ string, either
                # - replace with existing DB value
                # - raise a validation error
                # - ignore, if default present
                for key in password_dict.keys():
                    if attrs['extra_data'].get(key, None) == REPLACE_STR:
                        if key not in db_extra_data:
                            element = ujt.pivot_spec(ujt.survey_spec)[key]
                            # NOTE: validation _of_ the default values of password type
                            # questions not done here or on launch, but doing so could
                            # leak info about values, so it should not be added
                            if not ('default' in element and element['default']):
                                raise serializers.ValidationError(
                                    {"extra_data": _('Provided variable {} has no database value to replace with.').format(key)})
                        else:
                            attrs['extra_data'][key] = db_extra_data[key]

        # Build unsaved version of this config, use it to detect prompts errors
        mock_obj = self._build_mock_obj(attrs)
        accepted, rejected, errors = ujt._accept_or_ignore_job_kwargs(
            _exclude_errors=self.exclude_errors, **mock_obj.prompts_dict())

        # Remove all unprocessed $encrypted$ strings, indicating default usage
        if 'extra_data' in attrs and password_dict:
            for key, value in attrs['extra_data'].copy().items():
                if value == REPLACE_STR:
                    if key in password_dict:
                        attrs['extra_data'].pop(key)
                        attrs.get('survey_passwords', {}).pop(key, None)
                    else:
                        errors.setdefault('extra_vars', []).append(
                            _('"$encrypted$ is a reserved keyword, may not be used for {}."'.format(key))
                        )

        # Launch configs call extra_vars extra_data for historical reasons
        if 'extra_vars' in errors:
            errors['extra_data'] = errors.pop('extra_vars')
        if errors:
            raise serializers.ValidationError(errors)

        # Model `.save` needs the container dict, not the pseudo fields
        if mock_obj.char_prompts:
            attrs['char_prompts'] = mock_obj.char_prompts

        return attrs


class WorkflowJobTemplateNodeSerializer(LaunchConfigurationBaseSerializer):
    success_nodes = serializers.PrimaryKeyRelatedField(many=True, read_only=True)
    failure_nodes = serializers.PrimaryKeyRelatedField(many=True, read_only=True)
    always_nodes = serializers.PrimaryKeyRelatedField(many=True, read_only=True)
    exclude_errors = ('required',)  # required variables may be provided by WFJT or on launch

    class Meta:
        model = WorkflowJobTemplateNode
        fields = ('*', 'workflow_job_template', '-name', '-description', 'id', 'url', 'related',
                  'unified_job_template', 'success_nodes', 'failure_nodes', 'always_nodes', 'all_parents_must_converge',
                  'identifier',)

    def get_related(self, obj):
        res = super(WorkflowJobTemplateNodeSerializer, self).get_related(obj)
        res['create_approval_template'] = self.reverse('api:workflow_job_template_node_create_approval', kwargs={'pk': obj.pk})
        res['success_nodes'] = self.reverse('api:workflow_job_template_node_success_nodes_list', kwargs={'pk': obj.pk})
        res['failure_nodes'] = self.reverse('api:workflow_job_template_node_failure_nodes_list', kwargs={'pk': obj.pk})
        res['always_nodes'] = self.reverse('api:workflow_job_template_node_always_nodes_list', kwargs={'pk': obj.pk})
        if obj.unified_job_template:
            res['unified_job_template'] = obj.unified_job_template.get_absolute_url(self.context.get('request'))
        try:
            res['workflow_job_template'] = self.reverse('api:workflow_job_template_detail', kwargs={'pk': obj.workflow_job_template.pk})
        except WorkflowJobTemplate.DoesNotExist:
            pass
        return res

    def build_relational_field(self, field_name, relation_info):
        field_class, field_kwargs = super(WorkflowJobTemplateNodeSerializer, self).build_relational_field(field_name, relation_info)
        # workflow_job_template is read-only unless creating a new node.
        if self.instance and field_name == 'workflow_job_template':
            field_kwargs['read_only'] = True
            field_kwargs.pop('queryset', None)
        return field_class, field_kwargs

    def get_summary_fields(self, obj):
        summary_fields = super(WorkflowJobTemplateNodeSerializer, self).get_summary_fields(obj)
        if isinstance(obj.unified_job_template, WorkflowApprovalTemplate):
            summary_fields['unified_job_template']['timeout'] = obj.unified_job_template.timeout
        return summary_fields


class WorkflowJobNodeSerializer(LaunchConfigurationBaseSerializer):
    success_nodes = serializers.PrimaryKeyRelatedField(many=True, read_only=True)
    failure_nodes = serializers.PrimaryKeyRelatedField(many=True, read_only=True)
    always_nodes = serializers.PrimaryKeyRelatedField(many=True, read_only=True)

    class Meta:
        model = WorkflowJobNode
        fields = ('*', 'job', 'workflow_job', '-name', '-description', 'id', 'url', 'related',
                  'unified_job_template', 'success_nodes', 'failure_nodes', 'always_nodes',
                  'all_parents_must_converge', 'do_not_run', 'identifier')

    def get_related(self, obj):
        res = super(WorkflowJobNodeSerializer, self).get_related(obj)
        res['success_nodes'] = self.reverse('api:workflow_job_node_success_nodes_list', kwargs={'pk': obj.pk})
        res['failure_nodes'] = self.reverse('api:workflow_job_node_failure_nodes_list', kwargs={'pk': obj.pk})
        res['always_nodes'] = self.reverse('api:workflow_job_node_always_nodes_list', kwargs={'pk': obj.pk})
        if obj.unified_job_template:
            res['unified_job_template'] = obj.unified_job_template.get_absolute_url(self.context.get('request'))
        if obj.job:
            res['job'] = obj.job.get_absolute_url(self.context.get('request'))
        if obj.workflow_job:
            res['workflow_job'] = self.reverse('api:workflow_job_detail', kwargs={'pk': obj.workflow_job.pk})
        return res

    def get_summary_fields(self, obj):
        summary_fields = super(WorkflowJobNodeSerializer, self).get_summary_fields(obj)
        if isinstance(obj.job, WorkflowApproval):
            summary_fields['job']['timed_out'] = obj.job.timed_out
        return summary_fields


class WorkflowJobNodeListSerializer(WorkflowJobNodeSerializer):
    pass


class WorkflowJobNodeDetailSerializer(WorkflowJobNodeSerializer):
    pass


class WorkflowJobTemplateNodeDetailSerializer(WorkflowJobTemplateNodeSerializer):
    '''
    Influence the api browser sample data to not include workflow_job_template
    when editing a WorkflowNode.

    Note: I was not able to accomplish this through the use of extra_kwargs.
    Maybe something to do with workflow_job_template being a relational field?
    '''
    def build_relational_field(self, field_name, relation_info):
        field_class, field_kwargs = super(WorkflowJobTemplateNodeDetailSerializer, self).build_relational_field(field_name, relation_info)
        if self.instance and field_name == 'workflow_job_template':
            field_kwargs['read_only'] = True
            field_kwargs.pop('queryset', None)
        return field_class, field_kwargs


class WorkflowJobTemplateNodeCreateApprovalSerializer(BaseSerializer):

    class Meta:
        model = WorkflowApprovalTemplate
        fields = ('timeout', 'name', 'description',)

    def to_representation(self, obj):
        return {}


class JobListSerializer(JobSerializer, UnifiedJobListSerializer):
    pass


class AdHocCommandListSerializer(AdHocCommandSerializer, UnifiedJobListSerializer):
    pass


class SystemJobListSerializer(SystemJobSerializer, UnifiedJobListSerializer):

    class Meta:
        model = SystemJob
        fields = ('*', '-controller_node')  # field removal undone by UJ serializer


class JobHostSummarySerializer(BaseSerializer):

    class Meta:
        model = JobHostSummary
        fields = ('*', '-name', '-description', 'job', 'host', 'host_name', 'changed',
                  'dark', 'failures', 'ok', 'processed', 'skipped', 'failed',
                  'ignored', 'rescued')

    def get_related(self, obj):
        res = super(JobHostSummarySerializer, self).get_related(obj)
        res.update(dict(
            job=self.reverse('api:job_detail', kwargs={'pk': obj.job.pk})))
        if obj.host is not None:
            res.update(dict(
                host=self.reverse('api:host_detail', kwargs={'pk': obj.host.pk})
            ))
        return res

    def get_summary_fields(self, obj):
        d = super(JobHostSummarySerializer, self).get_summary_fields(obj)
        try:
            d['job']['job_template_id'] = obj.job.job_template.id
            d['job']['job_template_name'] = obj.job.job_template.name
        except (KeyError, AttributeError):
            pass
        return d


class JobEventSerializer(BaseSerializer):

    event_display = serializers.CharField(source='get_event_display2', read_only=True)
    event_level = serializers.IntegerField(read_only=True)

    class Meta:
        model = JobEvent
        fields = ('*', '-name', '-description', 'job', 'event', 'counter',
                  'event_display', 'event_data', 'event_level', 'failed',
                  'changed', 'uuid', 'parent_uuid', 'host', 'host_name',
                  'playbook', 'play', 'task', 'role', 'stdout', 'start_line', 'end_line',
                  'verbosity')

    def get_related(self, obj):
        res = super(JobEventSerializer, self).get_related(obj)
        res.update(dict(
            job = self.reverse('api:job_detail', kwargs={'pk': obj.job_id}),
        ))
        res['children'] = self.reverse('api:job_event_children_list', kwargs={'pk': obj.pk})
        if obj.host_id:
            res['host'] = self.reverse('api:host_detail', kwargs={'pk': obj.host_id})
        return res

    def get_summary_fields(self, obj):
        d = super(JobEventSerializer, self).get_summary_fields(obj)
        try:
            d['job']['job_template_id'] = obj.job.job_template.id
            d['job']['job_template_name'] = obj.job.job_template.name
        except (KeyError, AttributeError):
            pass
        return d

    def to_representation(self, obj):
        data = super(JobEventSerializer, self).to_representation(obj)
        # Show full stdout for playbook_on_* events.
        if obj and obj.event.startswith('playbook_on'):
            return data
        # If the view logic says to not trunctate (request was to the detail view or a param was used)
        if self.context.get('no_truncate', False):
            return data
        max_bytes = settings.EVENT_STDOUT_MAX_BYTES_DISPLAY
        if 'stdout' in data:
            data['stdout'] = truncate_stdout(data['stdout'], max_bytes)
        return data


class ProjectUpdateEventSerializer(JobEventSerializer):
    stdout = serializers.SerializerMethodField()
    event_data = serializers.SerializerMethodField()

    class Meta:
        model = ProjectUpdateEvent
        fields = ('*', '-name', '-description', '-job', '-job_id',
                  '-parent_uuid', '-parent', '-host', 'project_update')

    def get_related(self, obj):
        res = super(JobEventSerializer, self).get_related(obj)
        res['project_update'] = self.reverse(
            'api:project_update_detail', kwargs={'pk': obj.project_update_id}
        )
        return res

    def get_stdout(self, obj):
        return UriCleaner.remove_sensitive(obj.stdout)

    def get_event_data(self, obj):
        # the project update playbook uses the git or svn modules
        # to clone repositories, and those modules are prone to printing
        # raw SCM URLs in their stdout (which *could* contain passwords)
        # attempt to detect and filter HTTP basic auth passwords in the stdout
        # of these types of events
        if obj.event_data.get('task_action') in ('git', 'svn'):
            try:
                return json.loads(
                    UriCleaner.remove_sensitive(
                        json.dumps(obj.event_data)
                    )
                )
            except Exception:
                logger.exception("Failed to sanitize event_data")
                return {}
        else:
            return obj.event_data


class AdHocCommandEventSerializer(BaseSerializer):

    event_display = serializers.CharField(source='get_event_display', read_only=True)

    class Meta:
        model = AdHocCommandEvent
        fields = ('*', '-name', '-description', 'ad_hoc_command', 'event',
                  'counter', 'event_display', 'event_data', 'failed',
                  'changed', 'uuid', 'host', 'host_name', 'stdout',
                  'start_line', 'end_line', 'verbosity')

    def get_related(self, obj):
        res = super(AdHocCommandEventSerializer, self).get_related(obj)
        res.update(dict(
            ad_hoc_command = self.reverse('api:ad_hoc_command_detail', kwargs={'pk': obj.ad_hoc_command_id}),
        ))
        if obj.host:
            res['host'] = self.reverse('api:host_detail', kwargs={'pk': obj.host.pk})
        return res

    def to_representation(self, obj):
        data = super(AdHocCommandEventSerializer, self).to_representation(obj)
        # If the view logic says to not trunctate (request was to the detail view or a param was used)
        if self.context.get('no_truncate', False):
            return data
        max_bytes = settings.EVENT_STDOUT_MAX_BYTES_DISPLAY
        if 'stdout' in data:
            data['stdout'] = truncate_stdout(data['stdout'], max_bytes)
        return data


class InventoryUpdateEventSerializer(AdHocCommandEventSerializer):

    class Meta:
        model = InventoryUpdateEvent
        fields = ('*', '-name', '-description', '-ad_hoc_command', '-host',
                  '-host_name', 'inventory_update')

    def get_related(self, obj):
        res = super(AdHocCommandEventSerializer, self).get_related(obj)
        res['inventory_update'] = self.reverse(
            'api:inventory_update_detail', kwargs={'pk': obj.inventory_update_id}
        )
        return res


class SystemJobEventSerializer(AdHocCommandEventSerializer):

    class Meta:
        model = SystemJobEvent
        fields = ('*', '-name', '-description', '-ad_hoc_command', '-host',
                  '-host_name', 'system_job')

    def get_related(self, obj):
        res = super(AdHocCommandEventSerializer, self).get_related(obj)
        res['system_job'] = self.reverse(
            'api:system_job_detail', kwargs={'pk': obj.system_job_id}
        )
        return res


class JobLaunchSerializer(BaseSerializer):

    # Representational fields
    passwords_needed_to_start = serializers.ReadOnlyField()
    can_start_without_user_input = serializers.BooleanField(read_only=True)
    variables_needed_to_start = serializers.ReadOnlyField()
    credential_needed_to_start = serializers.SerializerMethodField()
    inventory_needed_to_start = serializers.SerializerMethodField()
    survey_enabled = serializers.SerializerMethodField()
    job_template_data = serializers.SerializerMethodField()
    defaults = serializers.SerializerMethodField()

    # Accepted on launch fields
    extra_vars = serializers.JSONField(required=False, write_only=True)
    inventory = serializers.PrimaryKeyRelatedField(
        queryset=Inventory.objects.all(),
        required=False, write_only=True
    )
    credentials = serializers.PrimaryKeyRelatedField(
        many=True, queryset=Credential.objects.all(),
        required=False, write_only=True
    )
    credential_passwords = VerbatimField(required=False, write_only=True)
    scm_branch = serializers.CharField(required=False, write_only=True, allow_blank=True)
    diff_mode = serializers.BooleanField(required=False, write_only=True)
    job_tags = serializers.CharField(required=False, write_only=True, allow_blank=True)
    job_type = serializers.ChoiceField(required=False, choices=NEW_JOB_TYPE_CHOICES, write_only=True)
    skip_tags = serializers.CharField(required=False, write_only=True, allow_blank=True)
    limit = serializers.CharField(required=False, write_only=True, allow_blank=True)
    verbosity = serializers.ChoiceField(required=False, choices=VERBOSITY_CHOICES, write_only=True)

    class Meta:
        model = JobTemplate
        fields = ('can_start_without_user_input', 'passwords_needed_to_start',
                  'extra_vars', 'inventory', 'scm_branch', 'limit', 'job_tags', 'skip_tags', 'job_type', 'verbosity', 'diff_mode',
                  'credentials', 'credential_passwords',
                  'ask_scm_branch_on_launch', 'ask_variables_on_launch', 'ask_tags_on_launch',
                  'ask_diff_mode_on_launch', 'ask_skip_tags_on_launch', 'ask_job_type_on_launch', 'ask_limit_on_launch',
                  'ask_verbosity_on_launch', 'ask_inventory_on_launch', 'ask_credential_on_launch',
                  'survey_enabled', 'variables_needed_to_start', 'credential_needed_to_start',
                  'inventory_needed_to_start', 'job_template_data', 'defaults', 'verbosity')
        read_only_fields = (
            'ask_scm_branch_on_launch',
            'ask_diff_mode_on_launch', 'ask_variables_on_launch', 'ask_limit_on_launch', 'ask_tags_on_launch',
            'ask_skip_tags_on_launch', 'ask_job_type_on_launch', 'ask_verbosity_on_launch',
            'ask_inventory_on_launch', 'ask_credential_on_launch',)

    def get_credential_needed_to_start(self, obj):
        return False

    def get_inventory_needed_to_start(self, obj):
        return not (obj and obj.inventory)

    def get_survey_enabled(self, obj):
        if obj:
            return obj.survey_enabled and 'spec' in obj.survey_spec
        return False

    def get_defaults(self, obj):
        defaults_dict = {}
        for field_name in JobTemplate.get_ask_mapping().keys():
            if field_name == 'inventory':
                defaults_dict[field_name] = dict(
                    name=getattrd(obj, '%s.name' % field_name, None),
                    id=getattrd(obj, '%s.pk' % field_name, None))
            elif field_name == 'credentials':
                for cred in obj.credentials.all():
                    cred_dict = dict(
                        id=cred.id,
                        name=cred.name,
                        credential_type=cred.credential_type.pk,
                        passwords_needed=cred.passwords_needed
                    )
                    if cred.credential_type.managed_by_tower and 'vault_id' in cred.credential_type.defined_fields:
                        cred_dict['vault_id'] = cred.get_input('vault_id', default=None)
                    defaults_dict.setdefault(field_name, []).append(cred_dict)
            else:
                defaults_dict[field_name] = getattr(obj, field_name)
        return defaults_dict

    def get_job_template_data(self, obj):
        return dict(name=obj.name, id=obj.id, description=obj.description)

    def validate_extra_vars(self, value):
        return vars_validate_or_raise(value)

    def validate(self, attrs):
        template = self.context.get('template')

        accepted, rejected, errors = template._accept_or_ignore_job_kwargs(
            _exclude_errors=['prompts'],  # make several error types non-blocking
            **attrs)
        self._ignored_fields = rejected

        # Basic validation - cannot run a playbook without a playbook
        if not template.project:
            errors['project'] = _("A project is required to run a job.")
        elif template.project.status in ('error', 'failed'):
            errors['playbook'] = _("Missing a revision to run due to failed project update.")

        # cannot run a playbook without an inventory
        if template.inventory and template.inventory.pending_deletion is True:
            errors['inventory'] = _("The inventory associated with this Job Template is being deleted.")
        elif 'inventory' in accepted and accepted['inventory'].pending_deletion:
            errors['inventory'] = _("The provided inventory is being deleted.")

        # Prohibit providing multiple credentials of the same CredentialType.kind
        # or multiples of same vault id
        distinct_cred_kinds = []
        for cred in accepted.get('credentials', []):
            if cred.unique_hash() in distinct_cred_kinds:
                errors.setdefault('credentials', []).append(_(
                    'Cannot assign multiple {} credentials.'
                ).format(cred.unique_hash(display=True)))
            if cred.credential_type.kind not in ('ssh', 'vault', 'cloud',
                                                 'net', 'kubernetes'):
                errors.setdefault('credentials', []).append(_(
                    'Cannot assign a Credential of kind `{}`'
                ).format(cred.credential_type.kind))
            distinct_cred_kinds.append(cred.unique_hash())

        # Prohibit removing credentials from the JT list (unsupported for now)
        template_credentials = template.credentials.all()
        if 'credentials' in attrs:
            removed_creds = set(template_credentials) - set(attrs['credentials'])
            provided_mapping = Credential.unique_dict(attrs['credentials'])
            for cred in removed_creds:
                if cred.unique_hash() in provided_mapping.keys():
                    continue  # User replaced credential with new of same type
                errors.setdefault('credentials', []).append(_(
                    'Removing {} credential at launch time without replacement is not supported. '
                    'Provided list lacked credential(s): {}.'
                ).format(cred.unique_hash(display=True), ', '.join([str(c) for c in removed_creds])))

        # verify that credentials (either provided or existing) don't
        # require launch-time passwords that have not been provided
        if 'credentials' in accepted:
            launch_credentials = Credential.unique_dict(
                list(template_credentials.all()) +
                list(accepted['credentials'])
            ).values()
        else:
            launch_credentials = template_credentials
        passwords = attrs.get('credential_passwords', {})  # get from original attrs
        passwords_lacking = []
        for cred in launch_credentials:
            for p in cred.passwords_needed:
                if p not in passwords:
                    passwords_lacking.append(p)
                else:
                    accepted.setdefault('credential_passwords', {})
                    accepted['credential_passwords'][p] = passwords[p]
        if len(passwords_lacking):
            errors['passwords_needed_to_start'] = passwords_lacking

        if errors:
            raise serializers.ValidationError(errors)

        if 'extra_vars' in accepted:
            extra_vars_save = accepted['extra_vars']
        else:
            extra_vars_save = None
        # Validate job against JobTemplate clean_ methods
        accepted = super(JobLaunchSerializer, self).validate(accepted)
        # Preserve extra_vars as dictionary internally
        if extra_vars_save:
            accepted['extra_vars'] = extra_vars_save

        return accepted


class WorkflowJobLaunchSerializer(BaseSerializer):

    can_start_without_user_input = serializers.BooleanField(read_only=True)
    defaults = serializers.SerializerMethodField()
    variables_needed_to_start = serializers.ReadOnlyField()
    survey_enabled = serializers.SerializerMethodField()
    extra_vars = VerbatimField(required=False, write_only=True)
    inventory = serializers.PrimaryKeyRelatedField(
        queryset=Inventory.objects.all(),
        required=False, write_only=True
    )
    limit = serializers.CharField(required=False, write_only=True, allow_blank=True)
    scm_branch = serializers.CharField(required=False, write_only=True, allow_blank=True)
    workflow_job_template_data = serializers.SerializerMethodField()

    class Meta:
        model = WorkflowJobTemplate
        fields = ('ask_inventory_on_launch', 'ask_limit_on_launch', 'ask_scm_branch_on_launch',
                  'can_start_without_user_input', 'defaults', 'extra_vars',
                  'inventory', 'limit', 'scm_branch',
                  'survey_enabled', 'variables_needed_to_start',
                  'node_templates_missing', 'node_prompts_rejected',
                  'workflow_job_template_data', 'survey_enabled', 'ask_variables_on_launch')
        read_only_fields = ('ask_inventory_on_launch', 'ask_variables_on_launch')

    def get_survey_enabled(self, obj):
        if obj:
            return obj.survey_enabled and 'spec' in obj.survey_spec
        return False

    def get_defaults(self, obj):
        defaults_dict = {}
        for field_name in WorkflowJobTemplate.get_ask_mapping().keys():
            if field_name == 'inventory':
                defaults_dict[field_name] = dict(
                    name=getattrd(obj, '%s.name' % field_name, None),
                    id=getattrd(obj, '%s.pk' % field_name, None))
            else:
                defaults_dict[field_name] = getattr(obj, field_name)
        return defaults_dict

    def get_workflow_job_template_data(self, obj):
        return dict(name=obj.name, id=obj.id, description=obj.description)

    def validate(self, attrs):
        template = self.instance

        accepted, rejected, errors = template._accept_or_ignore_job_kwargs(**attrs)
        self._ignored_fields = rejected

        if template.inventory and template.inventory.pending_deletion is True:
            errors['inventory'] = _("The inventory associated with this Workflow is being deleted.")
        elif 'inventory' in accepted and accepted['inventory'].pending_deletion:
            errors['inventory'] = _("The provided inventory is being deleted.")

        if errors:
            raise serializers.ValidationError(errors)

        WFJT_extra_vars = template.extra_vars
        WFJT_inventory = template.inventory
        WFJT_limit = template.limit
        WFJT_scm_branch = template.scm_branch
        super(WorkflowJobLaunchSerializer, self).validate(attrs)
        template.extra_vars = WFJT_extra_vars
        template.inventory = WFJT_inventory
        template.limit = WFJT_limit
        template.scm_branch = WFJT_scm_branch

        return accepted


class NotificationTemplateSerializer(BaseSerializer):
    show_capabilities = ['edit', 'delete', 'copy']
    capabilities_prefetch = [{'copy': 'organization.admin'}]

    class Meta:
        model = NotificationTemplate
        fields = ('*', 'organization', 'notification_type', 'notification_configuration', 'messages')


    type_map = {"string": (str,),
                "int": (int,),
                "bool": (bool,),
                "list": (list,),
                "password": (str,),
                "object": (dict, OrderedDict)}

    def to_representation(self, obj):
        ret = super(NotificationTemplateSerializer, self).to_representation(obj)
        if 'notification_configuration' in ret:
            ret['notification_configuration'] = obj.display_notification_configuration()
        return ret

    def get_related(self, obj):
        res = super(NotificationTemplateSerializer, self).get_related(obj)
        res.update(dict(
            test = self.reverse('api:notification_template_test', kwargs={'pk': obj.pk}),
            notifications = self.reverse('api:notification_template_notification_list', kwargs={'pk': obj.pk}),
            copy = self.reverse('api:notification_template_copy', kwargs={'pk': obj.pk}),
        ))
        if obj.organization:
            res['organization'] = self.reverse('api:organization_detail', kwargs={'pk': obj.organization.pk})
        return res

    def _recent_notifications(self, obj):
        return [{'id': x.id, 'status': x.status, 'created': x.created} for x in obj.notifications.all().order_by('-created')[:5]]

    def get_summary_fields(self, obj):
        d = super(NotificationTemplateSerializer, self).get_summary_fields(obj)
        d['recent_notifications'] = self._recent_notifications(obj)
        return d

    def validate_messages(self, messages):
        if messages is None:
            return None

        error_list = []
        collected_messages = []

        def check_messages(messages):
            for message_type in messages:
                if message_type not in ('message', 'body'):
                    error_list.append(_("Message type '{}' invalid, must be either 'message' or 'body'").format(message_type))
                    continue
                message = messages[message_type]
                if message is None:
                    continue
                if not isinstance(message, str):
                    error_list.append(_("Expected string for '{}', found {}, ").format(message_type, type(message)))
                    continue
                if message_type == 'message':
                    if '\n' in message:
                        error_list.append(_("Messages cannot contain newlines (found newline in {} event)".format(event)))
                        continue
                collected_messages.append(message)

        # Validate structure / content types
        if not isinstance(messages, dict):
            error_list.append(_("Expected dict for 'messages' field, found {}".format(type(messages))))
        else:
            for event in messages:
                if event not in ('started', 'success', 'error', 'workflow_approval'):
                    error_list.append(_("Event '{}' invalid, must be one of 'started', 'success', 'error', or 'workflow_approval'").format(event))
                    continue
                event_messages = messages[event]
                if event_messages is None:
                    continue
                if not isinstance(event_messages, dict):
                    error_list.append(_("Expected dict for event '{}', found {}").format(event, type(event_messages)))
                    continue
                if event == 'workflow_approval':
                    for subevent in event_messages:
                        if subevent not in ('running', 'approved', 'timed_out', 'denied'):
                            error_list.append(_("Workflow Approval event '{}' invalid, must be one of "
                                                "'running', 'approved', 'timed_out', or 'denied'").format(subevent))
                            continue
                        subevent_messages = event_messages[subevent]
                        if subevent_messages is None:
                            continue
                        if not isinstance(subevent_messages, dict):
                            error_list.append(_("Expected dict for workflow approval event '{}', found {}").format(subevent, type(subevent_messages)))
                            continue
                        check_messages(subevent_messages)
                else:
                    check_messages(event_messages)

        # Subclass to return name of undefined field
        class DescriptiveUndefined(StrictUndefined):
            # The parent class prevents _accessing attributes_ of an object
            # but will render undefined objects with 'Undefined'. This
            # prevents their use entirely.
            __repr__ = __str__ = StrictUndefined._fail_with_undefined_error

            def __init__(self, *args, **kwargs):
                super(DescriptiveUndefined, self).__init__(*args, **kwargs)
                # When an undefined field is encountered, return the name
                # of the undefined field in the exception message
                # (StrictUndefined refers to the explicitly set exception
                # message as the 'hint')
                self._undefined_hint = self._undefined_name

        # Ensure messages can be rendered
        for msg in collected_messages:
            env = sandbox.ImmutableSandboxedEnvironment(undefined=DescriptiveUndefined)
            try:
                env.from_string(msg).render(JobNotificationMixin.context_stub())
            except TemplateSyntaxError as exc:
                error_list.append(_("Unable to render message '{}': {}".format(msg, exc.message)))
            except UndefinedError as exc:
                error_list.append(_("Field '{}' unavailable".format(exc.message)))
            except SecurityError as exc:
                error_list.append(_("Security error due to field '{}'".format(exc.message)))

        # Ensure that if a webhook body was provided, that it can be rendered as a dictionary
        notification_type = ''
        if self.instance:
            notification_type = getattr(self.instance, 'notification_type', '')
        else:
            notification_type = self.initial_data.get('notification_type', '')

        if notification_type == 'webhook':
            for event in messages:
                if not messages[event]:
                    continue
                if not isinstance(messages[event], dict):
                    continue
                body = messages[event].get('body', {})
                if body:
                    try:
                        potential_body = json.loads(body)
                        if not isinstance(potential_body, dict):
                            error_list.append(_("Webhook body for '{}' should be a json dictionary. Found type '{}'."
                                                .format(event, type(potential_body).__name__)))
                    except json.JSONDecodeError as exc:
                        error_list.append(_("Webhook body for '{}' is not a valid json dictionary ({}).".format(event, exc)))

        if error_list:
            raise serializers.ValidationError(error_list)

        return messages

    def validate(self, attrs):
        from awx.api.views import NotificationTemplateDetail

        notification_type = None
        if 'notification_type' in attrs:
            notification_type = attrs['notification_type']
        elif self.instance:
            notification_type = self.instance.notification_type
        else:
            notification_type = None
        if not notification_type:
            raise serializers.ValidationError(_('Missing required fields for Notification Configuration: notification_type'))

        notification_class = NotificationTemplate.CLASS_FOR_NOTIFICATION_TYPE[notification_type]
        missing_fields = []
        incorrect_type_fields = []
        password_fields_to_forward = []
        error_list = []
        if 'notification_configuration' not in attrs:
            return attrs
        if self.context['view'].kwargs and isinstance(self.context['view'], NotificationTemplateDetail):
            object_actual = self.context['view'].get_object()
        else:
            object_actual = None
        for field, params in notification_class.init_parameters.items():
            if field not in attrs['notification_configuration']:
                if 'default' in params:
                    attrs['notification_configuration'][field] = params['default']
                else:
                    missing_fields.append(field)
                    continue
            field_val = attrs['notification_configuration'][field]
            field_type = params['type']
            expected_types = self.type_map[field_type]
            if not type(field_val) in expected_types:
                incorrect_type_fields.append((field, field_type))
                continue
            if field_type == "list" and len(field_val) < 1:
                error_list.append(_("No values specified for field '{}'").format(field))
                continue
            if field_type == "password" and field_val == "$encrypted$" and object_actual is not None:
                password_fields_to_forward.append(field)
            if field == "http_method" and field_val.lower() not in ['put', 'post']:
                error_list.append(_("HTTP method must be either 'POST' or 'PUT'."))
        if missing_fields:
            error_list.append(_("Missing required fields for Notification Configuration: {}.").format(missing_fields))
        if incorrect_type_fields:
            for type_field_error in incorrect_type_fields:
                error_list.append(_("Configuration field '{}' incorrect type, expected {}.").format(type_field_error[0],
                                                                                                    type_field_error[1]))
        if error_list:
            raise serializers.ValidationError(error_list)

        # Only pull the existing encrypted passwords from the existing objects
        # to assign to the attribute and forward on the call stack IF AND ONLY IF
        # we know an error will not be raised in the validation phase.
        # Otherwise, the encrypted password will be exposed.
        for field in password_fields_to_forward:
            attrs['notification_configuration'][field] = object_actual.notification_configuration[field]
        return super(NotificationTemplateSerializer, self).validate(attrs)


class NotificationSerializer(BaseSerializer):

    body = serializers.SerializerMethodField(
        help_text=_('Notification body')
    )

    class Meta:
        model = Notification
        fields = ('*', '-name', '-description', 'notification_template', 'error', 'status', 'notifications_sent',
                  'notification_type', 'recipients', 'subject', 'body')

    def get_body(self, obj):
        if obj.notification_type in ('webhook', 'pagerduty'):
            if isinstance(obj.body, dict):
                if 'body' in obj.body:
                    return obj.body['body']
            elif isinstance(obj.body, str):
                # attempt to load json string
                try:
                    potential_body = json.loads(obj.body)
                    if isinstance(potential_body, dict):
                        return potential_body
                except json.JSONDecodeError:
                    pass
        return obj.body

    def get_related(self, obj):
        res = super(NotificationSerializer, self).get_related(obj)
        res.update(dict(
            notification_template = self.reverse('api:notification_template_detail', kwargs={'pk': obj.notification_template.pk}),
        ))
        return res

    def to_representation(self, obj):
        ret = super(NotificationSerializer, self).to_representation(obj)

        if obj.notification_type == 'webhook':
            ret.pop('subject')
        if obj.notification_type not in ('email', 'webhook', 'pagerduty'):
            ret.pop('body')
        return ret


class LabelSerializer(BaseSerializer):

    class Meta:
        model = Label
        fields = ('*', '-description', 'organization')

    def get_related(self, obj):
        res = super(LabelSerializer, self).get_related(obj)
        if obj.organization:
            res['organization'] = self.reverse('api:organization_detail', kwargs={'pk': obj.organization.pk})
        return res


class SchedulePreviewSerializer(BaseSerializer):

    class Meta:
        model = Schedule
        fields = ('rrule',)

    # We reject rrules if:
    # - DTSTART is not include
    # - INTERVAL is not included
    # - SECONDLY is used
    # - TZID is used
    # - BYDAY prefixed with a number (MO is good but not 20MO)
    # - BYYEARDAY
    # - BYWEEKNO
    # - Multiple DTSTART or RRULE elements
    # - Can't contain both COUNT and UNTIL
    # - COUNT > 999
    def validate_rrule(self, value):
        rrule_value = value
        multi_by_month_day = r".*?BYMONTHDAY[\:\=][0-9]+,-*[0-9]+"
        multi_by_month = r".*?BYMONTH[\:\=][0-9]+,[0-9]+"
        by_day_with_numeric_prefix = r".*?BYDAY[\:\=][0-9]+[a-zA-Z]{2}"
        match_count = re.match(r".*?(COUNT\=[0-9]+)", rrule_value)
        match_multiple_dtstart = re.findall(r".*?(DTSTART(;[^:]+)?\:[0-9]+T[0-9]+Z?)", rrule_value)
        match_native_dtstart = re.findall(r".*?(DTSTART:[0-9]+T[0-9]+) ", rrule_value)
        match_multiple_rrule = re.findall(r".*?(RRULE\:)", rrule_value)
        if not len(match_multiple_dtstart):
            raise serializers.ValidationError(_('Valid DTSTART required in rrule. Value should start with: DTSTART:YYYYMMDDTHHMMSSZ'))
        if len(match_native_dtstart):
            raise serializers.ValidationError(_('DTSTART cannot be a naive datetime.  Specify ;TZINFO= or YYYYMMDDTHHMMSSZZ.'))
        if len(match_multiple_dtstart) > 1:
            raise serializers.ValidationError(_('Multiple DTSTART is not supported.'))
        if not len(match_multiple_rrule):
            raise serializers.ValidationError(_('RRULE required in rrule.'))
        if len(match_multiple_rrule) > 1:
            raise serializers.ValidationError(_('Multiple RRULE is not supported.'))
        if 'interval' not in rrule_value.lower():
            raise serializers.ValidationError(_('INTERVAL required in rrule.'))
        if 'secondly' in rrule_value.lower():
            raise serializers.ValidationError(_('SECONDLY is not supported.'))
        if re.match(multi_by_month_day, rrule_value):
            raise serializers.ValidationError(_('Multiple BYMONTHDAYs not supported.'))
        if re.match(multi_by_month, rrule_value):
            raise serializers.ValidationError(_('Multiple BYMONTHs not supported.'))
        if re.match(by_day_with_numeric_prefix, rrule_value):
            raise serializers.ValidationError(_("BYDAY with numeric prefix not supported."))
        if 'byyearday' in rrule_value.lower():
            raise serializers.ValidationError(_("BYYEARDAY not supported."))
        if 'byweekno' in rrule_value.lower():
            raise serializers.ValidationError(_("BYWEEKNO not supported."))
        if 'COUNT' in rrule_value and 'UNTIL' in rrule_value:
            raise serializers.ValidationError(_("RRULE may not contain both COUNT and UNTIL"))
        if match_count:
            count_val = match_count.groups()[0].strip().split("=")
            if int(count_val[1]) > 999:
                raise serializers.ValidationError(_("COUNT > 999 is unsupported."))
        try:
            Schedule.rrulestr(rrule_value)
        except Exception as e:
            import traceback
            logger.error(traceback.format_exc())
            raise serializers.ValidationError(_("rrule parsing failed validation: {}").format(e))
        return value


class ScheduleSerializer(LaunchConfigurationBaseSerializer, SchedulePreviewSerializer):
    show_capabilities = ['edit', 'delete']

    timezone = serializers.SerializerMethodField()
    until = serializers.SerializerMethodField()

    class Meta:
        model = Schedule
        fields = ('*', 'unified_job_template', 'enabled', 'dtstart', 'dtend', 'rrule', 'next_run', 'timezone',
                  'until')

    def get_timezone(self, obj):
        return obj.timezone

    def get_until(self, obj):
        return obj.until

    def get_related(self, obj):
        res = super(ScheduleSerializer, self).get_related(obj)
        res.update(dict(
            unified_jobs = self.reverse('api:schedule_unified_jobs_list', kwargs={'pk': obj.pk}),
        ))
        if obj.unified_job_template:
            res['unified_job_template'] = obj.unified_job_template.get_absolute_url(self.context.get('request'))
            try:
                if obj.unified_job_template.project:
                    res['project'] = obj.unified_job_template.project.get_absolute_url(self.context.get('request'))
            except ObjectDoesNotExist:
                pass
        if obj.inventory:
            res['inventory'] = obj.inventory.get_absolute_url(self.context.get('request'))
        elif obj.unified_job_template and getattr(obj.unified_job_template, 'inventory', None):
            res['inventory'] = obj.unified_job_template.inventory.get_absolute_url(self.context.get('request'))
        return res

    def get_summary_fields(self, obj):
        summary_fields = super(ScheduleSerializer, self).get_summary_fields(obj)

        if isinstance(obj.unified_job_template, SystemJobTemplate):
            summary_fields['unified_job_template']['job_type'] = obj.unified_job_template.job_type

        if 'inventory' in summary_fields:
            return summary_fields

        inventory = None
        if obj.unified_job_template and getattr(obj.unified_job_template, 'inventory', None):
            inventory = obj.unified_job_template.inventory
        else:
            return summary_fields

        summary_fields['inventory'] = dict()
        for field in SUMMARIZABLE_FK_FIELDS['inventory']:
            summary_fields['inventory'][field] = getattr(inventory, field, None)

        return summary_fields

    def validate_unified_job_template(self, value):
        if type(value) == InventorySource and value.source not in SCHEDULEABLE_PROVIDERS:
            raise serializers.ValidationError(_('Inventory Source must be a cloud resource.'))
        elif type(value) == Project and value.scm_type == '':
            raise serializers.ValidationError(_('Manual Project cannot have a schedule set.'))
        elif type(value) == InventorySource and value.source == 'scm' and value.update_on_project_update:
            raise serializers.ValidationError(_(
                'Inventory sources with `update_on_project_update` cannot be scheduled. '
                'Schedule its source project `{}` instead.'.format(value.source_project.name)))
        return value


class InstanceSerializer(BaseSerializer):

    consumed_capacity = serializers.SerializerMethodField()
    percent_capacity_remaining = serializers.SerializerMethodField()
    jobs_running = serializers.IntegerField(
        help_text=_('Count of jobs in the running or waiting state that '
                    'are targeted for this instance'),
        read_only=True
    )
    jobs_total = serializers.IntegerField(
        help_text=_('Count of all jobs that target this instance'),
        read_only=True
    )

    class Meta:
        model = Instance
        read_only_fields = ('uuid', 'hostname', 'version')
        fields = ("id", "type", "url", "related", "uuid", "hostname", "created", "modified", 'capacity_adjustment',
                  "version", "capacity", "consumed_capacity", "percent_capacity_remaining", "jobs_running", "jobs_total",
                  "cpu", "memory", "cpu_capacity", "mem_capacity", "enabled", "managed_by_policy")

    def get_related(self, obj):
        res = super(InstanceSerializer, self).get_related(obj)
        res['jobs'] = self.reverse('api:instance_unified_jobs_list', kwargs={'pk': obj.pk})
        res['instance_groups'] = self.reverse('api:instance_instance_groups_list', kwargs={'pk': obj.pk})
        return res

    def get_consumed_capacity(self, obj):
        return obj.consumed_capacity

    def get_percent_capacity_remaining(self, obj):
        if not obj.capacity or obj.consumed_capacity >= obj.capacity:
            return 0.0
        else:
            return float("{0:.2f}".format(((float(obj.capacity) - float(obj.consumed_capacity)) / (float(obj.capacity))) * 100))


class InstanceGroupSerializer(BaseSerializer):

    show_capabilities = ['edit', 'delete']

    committed_capacity = serializers.SerializerMethodField()
    consumed_capacity = serializers.SerializerMethodField()
    percent_capacity_remaining = serializers.SerializerMethodField()
    jobs_running = serializers.IntegerField(
        help_text=_('Count of jobs in the running or waiting state that '
                    'are targeted for this instance group'),
        read_only=True
    )
    jobs_total = serializers.IntegerField(
        help_text=_('Count of all jobs that target this instance group'),
        read_only=True
    )
    instances = serializers.SerializerMethodField()
    is_controller = serializers.BooleanField(
        help_text=_('Indicates whether instance group controls any other group'),
        read_only=True
    )
    is_isolated = serializers.BooleanField(
        help_text=_('Indicates whether instances in this group are isolated.'
                    'Isolated groups have a designated controller group.'),
        read_only=True
    )
    is_containerized = serializers.BooleanField(
        help_text=_('Indicates whether instances in this group are containerized.'
                    'Containerized groups have a designated Openshift or Kubernetes cluster.'),
        read_only=True
    )
    # NOTE: help_text is duplicated from field definitions, no obvious way of
    # both defining field details here and also getting the field's help_text
    policy_instance_percentage = serializers.IntegerField(
        default=0, min_value=0, max_value=100, required=False, initial=0,
        label=_('Policy Instance Percentage'),
        help_text=_("Minimum percentage of all instances that will be automatically assigned to "
                    "this group when new instances come online.")
    )
    policy_instance_minimum = serializers.IntegerField(
        default=0, min_value=0, required=False, initial=0,
        label=_('Policy Instance Minimum'),
        help_text=_("Static minimum number of Instances that will be automatically assign to "
                    "this group when new instances come online.")
    )
    policy_instance_list = serializers.ListField(
        child=serializers.CharField(), required=False,
        label=_('Policy Instance List'),
        help_text=_("List of exact-match Instances that will be assigned to this group")
    )

    class Meta:
        model = InstanceGroup
        fields = ("id", "type", "url", "related", "name", "created", "modified",
                  "capacity", "committed_capacity", "consumed_capacity",
                  "percent_capacity_remaining", "jobs_running", "jobs_total",
                  "instances", "controller", "is_controller", "is_isolated", "is_containerized", "credential",
                  "policy_instance_percentage", "policy_instance_minimum", "policy_instance_list",
                  "pod_spec_override", "summary_fields")

    def get_related(self, obj):
        res = super(InstanceGroupSerializer, self).get_related(obj)
        res['jobs'] = self.reverse('api:instance_group_unified_jobs_list', kwargs={'pk': obj.pk})
        res['instances'] = self.reverse('api:instance_group_instance_list', kwargs={'pk': obj.pk})
        if obj.controller_id:
            res['controller'] = self.reverse('api:instance_group_detail', kwargs={'pk': obj.controller_id})
        if obj.credential:
            res['credential'] = self.reverse('api:credential_detail', kwargs={'pk': obj.credential_id})

        return res

    def validate_policy_instance_list(self, value):
        for instance_name in value:
            if value.count(instance_name) > 1:
                raise serializers.ValidationError(_('Duplicate entry {}.').format(instance_name))
            if not Instance.objects.filter(hostname=instance_name).exists():
                raise serializers.ValidationError(_('{} is not a valid hostname of an existing instance.').format(instance_name))
            if Instance.objects.get(hostname=instance_name).is_isolated():
                raise serializers.ValidationError(_('Isolated instances may not be added or removed from instances groups via the API.'))
            if self.instance and self.instance.controller_id is not None:
                raise serializers.ValidationError(_('Isolated instance group membership may not be managed via the API.'))
        if value and self.instance and self.instance.is_containerized:
            raise serializers.ValidationError(_('Containerized instances may not be managed via the API'))
        return value

    def validate_policy_instance_percentage(self, value):
        if value and self.instance and self.instance.is_containerized:
            raise serializers.ValidationError(_('Containerized instances may not be managed via the API'))
        return value

    def validate_policy_instance_minimum(self, value):
        if value and self.instance and self.instance.is_containerized:
            raise serializers.ValidationError(_('Containerized instances may not be managed via the API'))
        return value

    def validate_name(self, value):
        if self.instance and self.instance.name == 'tower' and value != 'tower':
            raise serializers.ValidationError(_('tower instance group name may not be changed.'))
        return value

    def validate_credential(self, value):
        if value and not value.kubernetes:
            raise serializers.ValidationError(_('Only Kubernetes credentials can be associated with an Instance Group'))
        return value

    def get_capacity_dict(self):
        # Store capacity values (globally computed) in the context
        if 'capacity_map' not in self.context:
            ig_qs = None
            jobs_qs = UnifiedJob.objects.filter(status__in=('running', 'waiting'))
            if self.parent:  # Is ListView:
                ig_qs = self.parent.instance
            self.context['capacity_map'] = InstanceGroup.objects.capacity_values(
                qs=ig_qs, tasks=jobs_qs, breakdown=True)
        return self.context['capacity_map']

    def get_consumed_capacity(self, obj):
        return self.get_capacity_dict()[obj.name]['running_capacity']

    def get_committed_capacity(self, obj):
        return self.get_capacity_dict()[obj.name]['committed_capacity']

    def get_percent_capacity_remaining(self, obj):
        if not obj.capacity:
            return 0.0
        consumed = self.get_consumed_capacity(obj)
        if consumed >= obj.capacity:
            return 0.0
        else:
            return float("{0:.2f}".format(
                ((float(obj.capacity) - float(consumed)) / (float(obj.capacity))) * 100)
            )

    def get_instances(self, obj):
        return obj.instances.count()


class ActivityStreamSerializer(BaseSerializer):

    changes = serializers.SerializerMethodField()
    object_association = serializers.SerializerMethodField(
        help_text=_("When present, shows the field name of the role or relationship that changed."))
    object_type = serializers.SerializerMethodField(
        help_text=_("When present, shows the model on which the role or relationship was defined."))

    @cached_property
    def _local_summarizable_fk_fields(self):
        summary_dict = copy.copy(SUMMARIZABLE_FK_FIELDS)
        # Special requests
        summary_dict['group'] = summary_dict['group'] + ('inventory_id',)
        for key in summary_dict.keys():
            if 'id' not in summary_dict[key]:
                summary_dict[key] = summary_dict[key] + ('id',)
        field_list = list(summary_dict.items())
        # Needed related fields that are not in the default summary fields
        field_list += [
            ('workflow_job_template_node', ('id', 'unified_job_template_id')),
            ('label', ('id', 'name', 'organization_id')),
            ('notification', ('id', 'status', 'notification_type', 'notification_template_id')),
            ('o_auth2_access_token', ('id', 'user_id', 'description', 'application_id', 'scope')),
            ('o_auth2_application', ('id', 'name', 'description')),
            ('credential_type', ('id', 'name', 'description', 'kind', 'managed_by_tower')),
            ('ad_hoc_command', ('id', 'name', 'status', 'limit')),
            ('workflow_approval', ('id', 'name', 'unified_job_id')),
        ]
        return field_list

    class Meta:
        model = ActivityStream
        fields = ('*', '-name', '-description', '-created', '-modified', 'timestamp', 'operation',
                  'changes', 'object1', 'object2', 'object_association', 'action_node', 'object_type')

    def get_fields(self):
        ret = super(ActivityStreamSerializer, self).get_fields()
        for key, field in list(ret.items()):
            if key == 'changes':
                field.help_text = _('A summary of the new and changed values when an object is created, updated, or deleted')
            if key == 'object1':
                field.help_text = _('For create, update, and delete events this is the object type that was affected. '
                                    'For associate and disassociate events this is the object type associated or disassociated with object2.')
            if key == 'object2':
                field.help_text = _('Unpopulated for create, update, and delete events. For associate and disassociate '
                                    'events this is the object type that object1 is being associated with.')
            if key == 'operation':
                field.help_text = _('The action taken with respect to the given object(s).')
        return ret

    def get_changes(self, obj):
        if obj is None:
            return {}
        try:
            return json.loads(obj.changes)
        except Exception:
            logger.warn("Error deserializing activity stream json changes")
        return {}

    def get_object_association(self, obj):
        if not obj.object_relationship_type:
            return ""
        elif obj.object_relationship_type.endswith('_role'):
            # roles: these values look like
            # "awx.main.models.inventory.Inventory.admin_role"
            # due to historical reasons the UI expects just "role" here
            return "role"
        # default case: these values look like
        # "awx.main.models.organization.Organization_notification_templates_success"
        # so instead of splitting on period we have to take after the first underscore
        try:
            return obj.object_relationship_type.split(".")[-1].split("_", 1)[1]
        except Exception:
            logger.debug('Failed to parse activity stream relationship type {}'.format(obj.object_relationship_type))
            return ""

    def get_object_type(self, obj):
        if not obj.object_relationship_type:
            return ""
        elif obj.object_relationship_type.endswith('_role'):
            return camelcase_to_underscore(obj.object_relationship_type.rsplit('.', 2)[-2])
        # default case: these values look like
        # "awx.main.models.organization.Organization_notification_templates_success"
        # so we have to take after the last period but before the first underscore.
        try:
            cls = obj.object_relationship_type.rsplit('.', 1)[0]
            return camelcase_to_underscore(cls.split('_', 1))
        except Exception:
            logger.debug('Failed to parse activity stream relationship type {}'.format(obj.object_relationship_type))
            return ""

    def get_related(self, obj):
        data = {}
        if obj.actor is not None:
            data['actor'] = self.reverse('api:user_detail', kwargs={'pk': obj.actor.pk})
        for fk, __ in self._local_summarizable_fk_fields:
            if not hasattr(obj, fk):
                continue
            m2m_list = self._get_related_objects(obj, fk)
            if m2m_list:
                data[fk] = []
                id_list = []
                for item in m2m_list:
                    if getattr(item, 'id', None) in id_list:
                        continue
                    id_list.append(getattr(item, 'id', None))
                    if hasattr(item, 'get_absolute_url'):
                        url = item.get_absolute_url(self.context.get('request'))
                    else:
                        view_name = fk + '_detail'
                        url = self.reverse('api:' + view_name, kwargs={'pk': item.id})
                    data[fk].append(url)

                    if fk == 'schedule':
                        data['unified_job_template'] = item.unified_job_template.get_absolute_url(self.context.get('request'))
        if obj.setting and obj.setting.get('category', None):
            data['setting'] = self.reverse(
                'api:setting_singleton_detail',
                kwargs={'category_slug': obj.setting['category']}
            )
        return data

    def _get_related_objects(self, obj, fk):
        related_model = ActivityStream._meta.get_field(fk).related_model
        related_manager = getattr(obj, fk)
        if issubclass(related_model, PolymorphicModel) and hasattr(obj, '_prefetched_objects_cache'):
            # HACK: manually fill PolymorphicModel caches to prevent running query multiple times
            # unnecessary if django-polymorphic issue #68 is solved
            if related_manager.prefetch_cache_name not in obj._prefetched_objects_cache:
                obj._prefetched_objects_cache[related_manager.prefetch_cache_name] = list(related_manager.all())
        return related_manager.all()

    def _summarize_parent_ujt(self, obj, fk, summary_fields):
        summary_keys = {'job': 'job_template',
                        'workflow_job_template_node': 'workflow_job_template',
                        'workflow_approval_template': 'workflow_job_template',
                        'workflow_approval': 'workflow_job',
                        'schedule': 'unified_job_template'}
        if fk not in summary_keys:
            return
        related_obj = getattr(obj, summary_keys[fk], None)
        item = {}
        fields = SUMMARIZABLE_FK_FIELDS[summary_keys[fk]]
        if related_obj is not None:
            summary_fields[get_type_for_model(related_obj)] = []
            for field in fields:
                fval = getattr(related_obj, field, None)
                if fval is not None:
                    item[field] = fval
            summary_fields[get_type_for_model(related_obj)].append(item)

    def get_summary_fields(self, obj):
        summary_fields = OrderedDict()
        for fk, related_fields in self._local_summarizable_fk_fields:
            try:
                if not hasattr(obj, fk):
                    continue
                m2m_list = self._get_related_objects(obj, fk)
                if m2m_list:
                    summary_fields[fk] = []
                    for thisItem in m2m_list:
                        self._summarize_parent_ujt(thisItem, fk, summary_fields)
                        thisItemDict = {}
                        for field in related_fields:
                            fval = getattr(thisItem, field, None)
                            if fval is not None:
                                thisItemDict[field] = fval
                        summary_fields[fk].append(thisItemDict)
            except ObjectDoesNotExist:
                pass
        if obj.actor is not None:
            summary_fields['actor'] = dict(id = obj.actor.id,
                                           username = obj.actor.username,
                                           first_name = obj.actor.first_name,
                                           last_name = obj.actor.last_name)
        elif obj.deleted_actor:
            summary_fields['actor'] = obj.deleted_actor.copy()
            summary_fields['actor']['id'] = None
        if obj.setting:
            summary_fields['setting'] = [obj.setting]
        return summary_fields
