moviewyrm/bookwyrm/models/relationship.py

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""" defines relationships between users """
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from django.apps import apps
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from django.db import models, transaction, IntegrityError
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from django.db.models import Q
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from bookwyrm import activitypub
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from .activitypub_mixin import ActivitypubMixin, ActivityMixin
from .activitypub_mixin import generate_activity
from .base_model import BookWyrmModel
from . import fields
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class UserRelationship(BookWyrmModel):
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""" many-to-many through table for followers """
user_subject = fields.ForeignKey(
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"User",
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on_delete=models.PROTECT,
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related_name="%(class)s_user_subject",
activitypub_field="actor",
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)
user_object = fields.ForeignKey(
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"User",
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on_delete=models.PROTECT,
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related_name="%(class)s_user_object",
activitypub_field="object",
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)
@property
def privacy(self):
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""" all relationships are handled directly with the participants """
return "direct"
@property
def recipients(self):
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""" the remote user needs to recieve direct broadcasts """
return [u for u in [self.user_subject, self.user_object] if not u.local]
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class Meta:
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""" relationships should be unique """
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abstract = True
constraints = [
models.UniqueConstraint(
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fields=["user_subject", "user_object"], name="%(class)s_unique"
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),
models.CheckConstraint(
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check=~models.Q(user_subject=models.F("user_object")),
name="%(class)s_no_self",
),
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]
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def get_remote_id(self, status=None): # pylint: disable=arguments-differ
""" use shelf identifier in remote_id """
status = status or "follows"
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base_path = self.user_subject.remote_id
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return "%s#%s/%d" % (base_path, status, self.id)
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class UserFollows(ActivityMixin, UserRelationship):
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""" Following a user """
status = "follows"
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def to_activity(self):
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""" overrides default to manually set serializer """
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return activitypub.Follow(**generate_activity(self))
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def save(self, *args, **kwargs):
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""" really really don't let a user follow someone who blocked them """
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# blocking in either direction is a no-go
if UserBlocks.objects.filter(
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Q(
user_subject=self.user_subject,
user_object=self.user_object,
)
| Q(
user_subject=self.user_object,
user_object=self.user_subject,
)
).exists():
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raise IntegrityError()
# don't broadcast this type of relationship -- accepts and requests
# are handled by the UserFollowRequest model
super().save(*args, broadcast=False, **kwargs)
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@classmethod
def from_request(cls, follow_request):
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""" converts a follow request into a follow relationship """
return cls.objects.create(
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user_subject=follow_request.user_subject,
user_object=follow_request.user_object,
remote_id=follow_request.remote_id,
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)
class UserFollowRequest(ActivitypubMixin, UserRelationship):
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""" following a user requires manual or automatic confirmation """
status = "follow_request"
activity_serializer = activitypub.Follow
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def save(self, *args, broadcast=True, **kwargs):
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""" make sure the follow or block relationship doesn't already exist """
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# don't create a request if a follow already exists
if UserFollows.objects.filter(
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user_subject=self.user_subject,
user_object=self.user_object,
).exists():
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raise IntegrityError()
# blocking in either direction is a no-go
if UserBlocks.objects.filter(
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Q(
user_subject=self.user_subject,
user_object=self.user_object,
)
| Q(
user_subject=self.user_object,
user_object=self.user_subject,
)
).exists():
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raise IntegrityError()
super().save(*args, **kwargs)
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if broadcast and self.user_subject.local and not self.user_object.local:
self.broadcast(self.to_activity(), self.user_subject)
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if self.user_object.local:
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manually_approves = self.user_object.manually_approves_followers
if not manually_approves:
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self.accept()
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model = apps.get_model("bookwyrm.Notification", require_ready=True)
notification_type = "FOLLOW_REQUEST" if manually_approves else "FOLLOW"
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model.objects.create(
user=self.user_object,
related_user=self.user_subject,
notification_type=notification_type,
)
def accept(self):
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""" turn this request into the real deal"""
user = self.user_object
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if not self.user_subject.local:
activity = activitypub.Accept(
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id=self.get_remote_id(status="accepts"),
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actor=self.user_object.remote_id,
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object=self.to_activity(),
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).serialize()
self.broadcast(activity, user)
with transaction.atomic():
UserFollows.from_request(self)
self.delete()
def reject(self):
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""" generate a Reject for this follow request """
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if self.user_object.local:
activity = activitypub.Reject(
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id=self.get_remote_id(status="rejects"),
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actor=self.user_object.remote_id,
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object=self.to_activity(),
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).serialize()
self.broadcast(activity, self.user_object)
self.delete()
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class UserBlocks(ActivityMixin, UserRelationship):
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""" prevent another user from following you and seeing your posts """
status = "blocks"
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activity_serializer = activitypub.Block
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def save(self, *args, **kwargs):
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""" remove follow or follow request rels after a block is created """
super().save(*args, **kwargs)
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UserFollows.objects.filter(
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Q(user_subject=self.user_subject, user_object=self.user_object)
| Q(user_subject=self.user_object, user_object=self.user_subject)
).delete()
UserFollowRequest.objects.filter(
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Q(user_subject=self.user_subject, user_object=self.user_object)
| Q(user_subject=self.user_object, user_object=self.user_subject)
).delete()