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from typing import Optional
from django.db import models
from stator.models import State, StateField, StateGraph, StatorModel
class FollowStates(StateGraph):
pending = State(try_interval=3600)
requested = State()
accepted = State()
@pending.add_transition(requested)
async def try_request(cls, instance):
print("Would have tried to follow")
return False
requested.add_manual_transition(accepted)
class Follow(StatorModel):
"""
When one user (the source) follows other (the target)
"""
source = models.ForeignKey(
"users.Identity",
on_delete=models.CASCADE,
related_name="outbound_follows",
)
target = models.ForeignKey(
"users.Identity",
on_delete=models.CASCADE,
related_name="inbound_follows",
)
uri = models.CharField(blank=True, null=True, max_length=500)
note = models.TextField(blank=True, null=True)
state = StateField(FollowStates)
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
class Meta:
unique_together = [("source", "target")]
@classmethod
def maybe_get(cls, source, target) -> Optional["Follow"]:
"""
Returns a follow if it exists between source and target
"""
try:
return Follow.objects.get(source=source, target=target)
except Follow.DoesNotExist:
return None
@classmethod
def create_local(cls, source, target):
"""
Creates a Follow from a local Identity to the target
(which can be local or remote).
"""
if not source.local:
raise ValueError("You cannot initiate follows from a remote Identity")
try:
follow = Follow.objects.get(source=source, target=target)
except Follow.DoesNotExist:
follow = Follow.objects.create(source=source, target=target, uri="")
follow.uri = source.actor_uri + f"follow/{follow.pk}/"
# TODO: Local follow approvals
if target.local:
follow.state = FollowStates.accepted
follow.save()
return follow
def undo(self):
"""
Undoes this follow
"""
if not self.target.local:
Task.submit("follow_undo", str(self.pk))
self.delete()
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