moviewyrm/bookwyrm/models/relationship.py

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''' defines relationships between users '''
from django.db import models
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from django.db.models import Q
from django.dispatch import receiver
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from bookwyrm import activitypub
from .base_model import ActivitypubMixin, BookWyrmModel
from . import fields
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class UserRelationship(ActivitypubMixin, BookWyrmModel):
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''' many-to-many through table for followers '''
user_subject = fields.ForeignKey(
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'User',
on_delete=models.PROTECT,
related_name='%(class)s_user_subject',
activitypub_field='actor',
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)
user_object = fields.ForeignKey(
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'User',
on_delete=models.PROTECT,
related_name='%(class)s_user_object',
activitypub_field='object',
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)
class Meta:
''' relationships should be unique '''
abstract = True
constraints = [
models.UniqueConstraint(
fields=['user_subject', 'user_object'],
name='%(class)s_unique'
),
models.CheckConstraint(
check=~models.Q(user_subject=models.F('user_object')),
name='%(class)s_no_self'
)
]
activity_serializer = activitypub.Follow
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def get_remote_id(self, status=None):# pylint: disable=arguments-differ
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''' use shelf identifier in remote_id '''
status = status or 'follows'
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base_path = self.user_subject.remote_id
return '%s#%s/%d' % (base_path, status, self.id)
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def to_accept_activity(self):
''' generate an Accept for this follow request '''
return activitypub.Accept(
id=self.get_remote_id(status='accepts'),
actor=self.user_object.remote_id,
object=self.to_activity()
).serialize()
def to_reject_activity(self):
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''' generate a Reject for this follow request '''
return activitypub.Reject(
id=self.get_remote_id(status='rejects'),
actor=self.user_object.remote_id,
object=self.to_activity()
).serialize()
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class UserFollows(UserRelationship):
''' Following a user '''
status = 'follows'
@classmethod
def from_request(cls, follow_request):
''' converts a follow request into a follow relationship '''
return cls(
user_subject=follow_request.user_subject,
user_object=follow_request.user_object,
remote_id=follow_request.remote_id,
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)
class UserFollowRequest(UserRelationship):
''' following a user requires manual or automatic confirmation '''
status = 'follow_request'
def save(self, *args, **kwargs):
''' make sure the follow relationship doesn't already exist '''
try:
UserFollows.objects.get(
user_subject=self.user_subject,
user_object=self.user_object
)
return None
except UserFollows.DoesNotExist:
return super().save(*args, **kwargs)
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class UserBlocks(UserRelationship):
''' prevent another user from following you and seeing your posts '''
status = 'blocks'
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activity_serializer = activitypub.Block
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@receiver(models.signals.post_save, sender=UserBlocks)
#pylint: disable=unused-argument
def execute_after_save(sender, instance, created, *args, **kwargs):
''' remove follow or follow request rels after a block is created '''
UserFollows.objects.filter(
Q(user_subject=instance.user_subject,
user_object=instance.user_object) | \
Q(user_subject=instance.user_object,
user_object=instance.user_subject)
).delete()
UserFollowRequest.objects.filter(
Q(user_subject=instance.user_subject,
user_object=instance.user_object) | \
Q(user_subject=instance.user_object,
user_object=instance.user_subject)
).delete()