OpenSlides/openslides/utils/rest_api.py

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import re
from collections import OrderedDict
from urllib.parse import urlparse
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from rest_framework import status # noqa
from rest_framework.decorators import detail_route, list_route # noqa
from rest_framework.metadata import SimpleMetadata # noqa
from rest_framework.mixins import DestroyModelMixin, UpdateModelMixin # noqa
from rest_framework.response import Response # noqa
from rest_framework.routers import DefaultRouter
from rest_framework.serializers import ModelSerializer as _ModelSerializer
from rest_framework.serializers import ( # noqa
MANY_RELATION_KWARGS,
CharField,
DictField,
Field,
FileField,
IntegerField,
ListField,
ListSerializer,
ManyRelatedField,
PrimaryKeyRelatedField,
RelatedField,
SerializerMethodField,
ValidationError,
)
from rest_framework.viewsets import GenericViewSet as _GenericViewSet # noqa
from rest_framework.viewsets import ModelViewSet as _ModelViewSet # noqa
from rest_framework.viewsets import \
ReadOnlyModelViewSet as _ReadOnlyModelViewSet # noqa
from rest_framework.viewsets import ViewSet as _ViewSet # noqa
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from .exceptions import OpenSlidesError
router = DefaultRouter()
class IdManyRelatedField(ManyRelatedField):
"""
ManyRelatedField that appends an suffix to the sub-fields.
Only works together with the IdPrimaryKeyRelatedField and our
ModelSerializer.
"""
field_name_suffix = '_id'
def bind(self, field_name, parent):
"""
Called when the field is bound to the serializer.
See IdPrimaryKeyRelatedField for more informations.
"""
self.source = field_name[:-len(self.field_name_suffix)]
super().bind(field_name, parent)
class IdPrimaryKeyRelatedField(PrimaryKeyRelatedField):
"""
Field, that renames the field name to FIELD_NAME_id.
Only works together the our ModelSerializer.
"""
field_name_suffix = '_id'
def bind(self, field_name, parent):
"""
Called when the field is bound to the serializer.
Changes the source so that the original field name is used (removes
the _id suffix).
"""
if field_name:
# field_name is an empty string when the field is created with the
# attribute many=True. In this case the suffix is added with the
# IdManyRelatedField class.
self.source = field_name[:-len(self.field_name_suffix)]
super().bind(field_name, parent)
@classmethod
def many_init(cls, *args, **kwargs):
"""
Method from rest_framework.relations.RelatedField That uses our
IdManyRelatedField class instead of
rest_framework.relations.ManyRelatedField class.
"""
list_kwargs = {'child_relation': cls(*args, **kwargs)}
for key in kwargs.keys():
if key in MANY_RELATION_KWARGS:
list_kwargs[key] = kwargs[key]
return IdManyRelatedField(**list_kwargs)
class ModelSerializer(_ModelSerializer):
"""
ModelSerializer that changes the field names of related fields to
FIELD_NAME_id.
"""
serializer_related_field = IdPrimaryKeyRelatedField
def get_fields(self):
"""
Returns all fields of the serializer.
"""
fields = OrderedDict()
for field_name, field in super().get_fields().items():
try:
field_name += field.field_name_suffix
except AttributeError:
pass
fields[field_name] = field
return fields
class PermissionMixin:
"""
Mixin for subclasses of APIView like GenericViewSet and ModelViewSet.
The methods check_view_permissions or check_projector_requirements are
evaluated. If both return False self.permission_denied() is called.
Django REST framework's permission system is disabled.
"""
def get_permissions(self):
"""
Overriden method to check view and projector permissions. Returns an
empty interable so Django REST framework won't do any other
permission checks by evaluating Django REST framework style permission
classes and the request passes.
"""
if not self.check_view_permissions() and not self.check_projector_requirements():
self.permission_denied(self.request)
return ()
def check_view_permissions(self):
"""
Override this and return True if the requesting user should be able to
get access to your view.
"""
return False
def check_projector_requirements(self):
"""
Helper method which returns True if the current request (on this
view instance) is required for at least one active projector element.
"""
from openslides.core.models import Projector
result = False
if self.request.user.has_perm('core.can_see_projector'):
for requirement in Projector.get_all_requirements():
if requirement.is_currently_required(view_instance=self):
result = True
break
return result
class GenericViewSet(PermissionMixin, _GenericViewSet):
pass
class ModelViewSet(PermissionMixin, _ModelViewSet):
pass
class ReadOnlyModelViewSet(PermissionMixin, _ReadOnlyModelViewSet):
pass
class ViewSet(PermissionMixin, _ViewSet):
pass
def get_collection_and_id_from_url(url):
"""
Helper function. Returns a tuple containing the collection name and the id
extracted out of the given REST api URL.
For example get_collection_and_id_from_url('http://localhost/api/users/user/3/')
returns ('users/user', '3').
Raises OpenSlidesError if the URL is invalid.
"""
path = urlparse(url).path
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match = re.match(r'^/rest/(?P<collection>[-\w]+/[-\w]+)/(?P<id>[-\w]+)/$', path)
if not match:
raise OpenSlidesError('Invalid REST api URL: %s' % url)
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return match.group('collection'), match.group('id')