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431 lines
14 KiB
Python
431 lines
14 KiB
Python
import logging
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from typing import Optional
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import httpx
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from django.db import models, transaction
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from core.ld import canonicalise, get_str_or_id
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from core.snowflake import Snowflake
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from stator.models import State, StateField, StateGraph, StatorModel
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from users.models.block import Block
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from users.models.identity import Identity
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from users.models.inbox_message import InboxMessage
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class FollowStates(StateGraph):
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unrequested = State(try_interval=600)
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pending_approval = State(externally_progressed=True)
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accepting = State(try_interval=24 * 60 * 60)
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rejecting = State(try_interval=24 * 60 * 60)
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accepted = State(externally_progressed=True)
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undone = State(try_interval=24 * 60 * 60)
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pending_removal = State(try_interval=60 * 60)
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removed = State(delete_after=1)
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unrequested.transitions_to(pending_approval)
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unrequested.transitions_to(accepting)
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unrequested.transitions_to(rejecting)
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unrequested.times_out_to(removed, seconds=24 * 60 * 60)
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pending_approval.transitions_to(accepting)
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pending_approval.transitions_to(rejecting)
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pending_approval.transitions_to(pending_removal)
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accepting.transitions_to(accepted)
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accepting.times_out_to(accepted, seconds=7 * 24 * 60 * 60)
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rejecting.transitions_to(pending_removal)
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rejecting.times_out_to(pending_removal, seconds=24 * 60 * 60)
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accepted.transitions_to(rejecting)
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accepted.transitions_to(undone)
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undone.transitions_to(pending_removal)
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pending_removal.transitions_to(removed)
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@classmethod
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def group_active(cls):
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"""
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Follows that are active means they are being handled and no need to re-request
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"""
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return [cls.unrequested, cls.pending_approval, cls.accepting, cls.accepted]
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@classmethod
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def group_accepted(cls):
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"""
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Follows that are accepting/accepted means they should be consider accepted when deliver to followers
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"""
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return [cls.accepting, cls.accepted]
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@classmethod
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def handle_unrequested(cls, instance: "Follow"):
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"""
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Follows start unrequested as their initial state regardless of local/remote
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"""
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if Block.maybe_get(
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source=instance.target, target=instance.source, require_active=True
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):
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return cls.rejecting
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if not instance.target.local:
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if not instance.source.local:
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# remote follow remote, invalid case
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return cls.removed
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# local follow remote, send Follow to target server
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# Don't try if the other identity didn't fetch yet
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if not instance.target.inbox_uri:
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return
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# Sign it and send it
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try:
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instance.source.signed_request(
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method="post",
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uri=instance.target.inbox_uri,
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body=canonicalise(instance.to_ap()),
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)
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except httpx.RequestError:
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return
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return cls.pending_approval
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# local/remote follow local, check manually_approve
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if instance.target.manually_approves_followers:
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from activities.models import TimelineEvent
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TimelineEvent.add_follow_request(instance.target, instance.source)
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return cls.pending_approval
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return cls.accepting
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@classmethod
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def handle_accepting(cls, instance: "Follow"):
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if not instance.source.local:
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# send an Accept object to the source server
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try:
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instance.target.signed_request(
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method="post",
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uri=instance.source.inbox_uri,
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body=canonicalise(instance.to_accept_ap()),
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)
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except httpx.RequestError:
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return
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from activities.models import TimelineEvent
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TimelineEvent.add_follow(instance.target, instance.source)
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return cls.accepted
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@classmethod
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def handle_rejecting(cls, instance: "Follow"):
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if not instance.source.local:
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# send a Reject object to the source server
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try:
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instance.target.signed_request(
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method="post",
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uri=instance.source.inbox_uri,
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body=canonicalise(instance.to_reject_ap()),
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)
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except httpx.RequestError:
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return
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return cls.pending_removal
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@classmethod
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def handle_undone(cls, instance: "Follow"):
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"""
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Delivers the Undo object to the target server
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"""
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try:
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if not instance.target.local:
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instance.source.signed_request(
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method="post",
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uri=instance.target.inbox_uri,
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body=canonicalise(instance.to_undo_ap()),
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)
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except httpx.RequestError:
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return
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return cls.pending_removal
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@classmethod
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def handle_pending_removal(cls, instance: "Follow"):
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if instance.target.local:
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from activities.models import TimelineEvent
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TimelineEvent.delete_follow(instance.target, instance.source)
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return cls.removed
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class FollowQuerySet(models.QuerySet):
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def active(self):
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query = self.filter(state__in=FollowStates.group_active())
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return query
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def accepted(self):
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query = self.filter(state__in=FollowStates.group_accepted())
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return query
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class FollowManager(models.Manager):
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def get_queryset(self):
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return FollowQuerySet(self.model, using=self._db)
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def active(self):
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return self.get_queryset().active()
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def accepted(self):
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return self.get_queryset().accepted()
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class Follow(StatorModel):
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"""
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When one user (the source) follows other (the target)
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"""
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id = models.BigIntegerField(primary_key=True, default=Snowflake.generate_follow)
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source = models.ForeignKey(
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"users.Identity",
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on_delete=models.CASCADE,
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related_name="outbound_follows",
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)
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target = models.ForeignKey(
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"users.Identity",
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on_delete=models.CASCADE,
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related_name="inbound_follows",
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)
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boosts = models.BooleanField(
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default=True, help_text="Also follow boosts from this user"
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)
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uri = models.CharField(blank=True, null=True, max_length=500)
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note = models.TextField(blank=True, null=True)
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state = StateField(FollowStates)
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created = models.DateTimeField(auto_now_add=True)
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updated = models.DateTimeField(auto_now=True)
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objects = FollowManager()
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class Meta:
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unique_together = [("source", "target")]
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indexes: list = [] # We need this so Stator can add its own
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def __str__(self):
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return f"#{self.id}: {self.source} → {self.target}"
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### Alternate fetchers/constructors ###
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@classmethod
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def maybe_get(cls, source, target, require_active=False) -> Optional["Follow"]:
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"""
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Returns a follow if it exists between source and target
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"""
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try:
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if require_active:
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return Follow.objects.active().get(source=source, target=target)
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else:
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return Follow.objects.get(source=source, target=target)
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except Follow.DoesNotExist:
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return None
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@classmethod
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def create_local(cls, source, target, boosts=True):
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"""
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Creates a Follow from a local Identity to the target
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(which can be local or remote).
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"""
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if not source.local:
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raise ValueError("You cannot initiate follows from a remote Identity")
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try:
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follow = Follow.objects.get(source=source, target=target)
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if not follow.active:
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follow.state = FollowStates.unrequested
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follow.boosts = boosts
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follow.save()
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except Follow.DoesNotExist:
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with transaction.atomic():
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follow = Follow.objects.create(
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source=source,
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target=target,
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boosts=boosts,
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uri="",
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state=FollowStates.unrequested,
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)
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follow.uri = source.actor_uri + f"follow/{follow.pk}/"
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follow.save()
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return follow
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### Properties ###
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@property
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def active(self):
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return self.state in FollowStates.group_active()
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@property
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def accepted(self):
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return self.state in FollowStates.group_accepted()
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### ActivityPub (outbound) ###
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def to_ap(self):
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"""
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Returns the AP JSON for this object
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"""
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return {
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"type": "Follow",
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"id": self.uri,
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"actor": self.source.actor_uri,
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"object": self.target.actor_uri,
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}
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def to_accept_ap(self):
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"""
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Returns the AP JSON for this objects' accept.
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"""
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return {
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"type": "Accept",
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"id": self.uri + "#accept",
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"actor": self.target.actor_uri,
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"object": self.to_ap(),
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}
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def to_reject_ap(self):
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"""
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Returns the AP JSON for this objects' rejection.
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"""
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return {
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"type": "Reject",
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"id": self.uri + "#reject",
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"actor": self.target.actor_uri,
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"object": self.to_ap(),
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}
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def to_undo_ap(self):
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"""
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Returns the AP JSON for this objects' undo.
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"""
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return {
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"type": "Undo",
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"id": self.uri + "#undo",
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"actor": self.source.actor_uri,
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"object": self.to_ap(),
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}
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### ActivityPub (inbound) ###
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@classmethod
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def by_ap(cls, data: str | dict, create=False) -> "Follow":
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"""
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Retrieves a Follow instance by its ActivityPub JSON object or its URI.
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Optionally creates one if it's not present.
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Raises DoesNotExist if it's not found and create is False.
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"""
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# If it's a string, do the reference resolve
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if isinstance(data, str):
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bits = data.strip("/").split("/")
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if bits[-2] != "follow":
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raise ValueError(f"Unknown Follow object URI: {data}")
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return Follow.objects.get(pk=bits[-1])
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# Otherwise, do object resolve
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else:
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# Resolve source and target and see if a Follow exists
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source = Identity.by_actor_uri(data["actor"], create=create)
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target = Identity.by_actor_uri(get_str_or_id(data["object"]))
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follow = cls.maybe_get(source=source, target=target)
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# If it doesn't exist, create one in the unrequested state
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if follow is None:
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if create:
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return cls.objects.create(
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source=source,
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target=target,
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uri=data["id"],
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state=FollowStates.unrequested,
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)
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else:
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raise cls.DoesNotExist(
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f"No follow with source {source} and target {target}", data
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)
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else:
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return follow
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@classmethod
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def handle_request_ap(cls, data):
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"""
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Handles an incoming follow request
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"""
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with transaction.atomic():
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try:
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follow = cls.by_ap(data, create=True)
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except Identity.DoesNotExist:
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logging.info(
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"Identity not found for incoming Follow", extra={"data": data}
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)
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return
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if follow.state == FollowStates.accepted:
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# Likely the source server missed the Accept, send it back again
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follow.transition_perform(FollowStates.accepting)
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@classmethod
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def handle_accept_ap(cls, data):
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"""
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Handles an incoming Follow Accept for one of our follows
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"""
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# Resolve source and target and see if a Follow exists (it really should)
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try:
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follow = cls.by_ap(data["object"])
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except (cls.DoesNotExist, Identity.DoesNotExist):
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logging.info(
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"Follow or Identity not found for incoming Accept",
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extra={"data": data},
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)
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return
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# Ensure the Accept actor is the Follow's target
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if data["actor"] != follow.target.actor_uri:
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raise ValueError("Accept actor does not match its Follow object", data)
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# If the follow was waiting to be accepted, transition it
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if follow and follow.state == FollowStates.pending_approval:
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follow.transition_perform(FollowStates.accepting)
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@classmethod
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def handle_reject_ap(cls, data):
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"""
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Handles an incoming Follow Reject for one of our follows
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"""
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# Resolve source and target and see if a Follow exists (it really should)
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try:
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follow = cls.by_ap(data["object"])
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except (cls.DoesNotExist, Identity.DoesNotExist):
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logging.info(
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"Follow or Identity not found for incoming Reject",
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extra={"data": data},
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)
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return
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# Ensure the Accept actor is the Follow's target
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if data["actor"] != follow.target.actor_uri:
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raise ValueError("Reject actor does not match its Follow object", data)
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# Clear timeline if remote target remove local source from their previously accepted follows
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if follow.accepted:
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InboxMessage.create_internal(
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{
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"type": "ClearTimeline",
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"object": follow.target.pk,
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"actor": follow.source.pk,
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}
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)
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# Mark the follow rejected
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follow.transition_perform(FollowStates.rejecting)
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@classmethod
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def handle_undo_ap(cls, data):
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"""
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Handles an incoming Follow Undo for one of our follows
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"""
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# Resolve source and target and see if a Follow exists (it hopefully does)
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try:
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follow = cls.by_ap(data["object"])
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except (cls.DoesNotExist, Identity.DoesNotExist):
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logging.info(
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"Follow or Identity not found for incoming Undo", extra={"data": data}
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)
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return
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# Ensure the Undo actor is the Follow's source
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if data["actor"] != follow.source.actor_uri:
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raise ValueError("Accept actor does not match its Follow object", data)
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# Delete the follow
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follow.transition_perform(FollowStates.pending_removal)
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