mirror of
https://github.com/jointakahe/takahe.git
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820 lines
28 KiB
Python
820 lines
28 KiB
Python
from functools import cached_property, partial
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from typing import Literal
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from urllib.parse import urlparse
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import httpx
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import urlman
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from asgiref.sync import async_to_sync, sync_to_async
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from django.conf import settings
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from django.db import IntegrityError, models
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from django.template.defaultfilters import linebreaks_filter
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from django.utils import timezone
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from django.utils.functional import lazy
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from lxml import etree
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from core.exceptions import ActorMismatchError
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from core.html import ContentRenderer, strip_html
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from core.ld import (
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canonicalise,
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format_ld_date,
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get_first_image_url,
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get_list,
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media_type_from_filename,
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)
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from core.models import Config
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from core.signatures import HttpSignature, RsaKeys
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from core.uploads import upload_namer
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from core.uris import AutoAbsoluteUrl, RelativeAbsoluteUrl, StaticAbsoluteUrl
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from stator.models import State, StateField, StateGraph, StatorModel
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from users.models.domain import Domain
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from users.models.system_actor import SystemActor
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class IdentityStates(StateGraph):
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"""
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Identities sit in "updated" for up to system.identity_max_age, and then
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go back to "outdated" for refetching.
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When a local identity is "edited" or "deleted", it will fanout the change to
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all followers and transition to "updated"
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"""
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outdated = State(try_interval=3600, force_initial=True)
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updated = State(try_interval=86400 * 7, attempt_immediately=False)
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edited = State(try_interval=300, attempt_immediately=True)
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deleted = State(try_interval=300, attempt_immediately=True)
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deleted_fanned_out = State(externally_progressed=True)
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deleted.transitions_to(deleted_fanned_out)
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edited.transitions_to(updated)
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updated.transitions_to(edited)
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edited.transitions_to(deleted)
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outdated.transitions_to(updated)
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updated.transitions_to(outdated)
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@classmethod
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def group_deleted(cls):
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return [cls.deleted, cls.deleted_fanned_out]
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@classmethod
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async def targets_fan_out(cls, identity: "Identity", type_: str) -> None:
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from activities.models import FanOut
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from users.models import Follow
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# Fan out to each target
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shared_inboxes = set()
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async for follower in Follow.objects.select_related("source", "target").filter(
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target=identity
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):
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# Dedupe shared_inbox_uri
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shared_uri = follower.source.shared_inbox_uri
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if shared_uri and shared_uri in shared_inboxes:
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continue
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await FanOut.objects.acreate(
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identity=follower.source,
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type=type_,
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subject_identity=identity,
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)
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shared_inboxes.add(shared_uri)
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@classmethod
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async def handle_edited(cls, instance: "Identity"):
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from activities.models import FanOut
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if not instance.local:
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return cls.updated
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identity = await instance.afetch_full()
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await cls.targets_fan_out(identity, FanOut.Types.identity_edited)
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return cls.updated
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@classmethod
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async def handle_deleted(cls, instance: "Identity"):
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from activities.models import FanOut
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if not instance.local:
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return cls.updated
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identity = await instance.afetch_full()
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await cls.targets_fan_out(identity, FanOut.Types.identity_deleted)
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return cls.deleted_fanned_out
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@classmethod
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async def handle_outdated(cls, identity: "Identity"):
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# Local identities never need fetching
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if identity.local:
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return cls.updated
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# Run the actor fetch and progress to updated if it succeeds
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if await identity.fetch_actor():
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return cls.updated
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@classmethod
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async def handle_updated(cls, instance: "Identity"):
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if instance.state_age > Config.system.identity_max_age:
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return cls.outdated
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class IdentityQuerySet(models.QuerySet):
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def not_deleted(self):
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query = self.exclude(state__in=IdentityStates.group_deleted())
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return query
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class IdentityManager(models.Manager):
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def get_queryset(self):
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return IdentityQuerySet(self.model, using=self._db)
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def not_deleted(self):
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return self.get_queryset().not_deleted()
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class Identity(StatorModel):
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"""
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Represents both local and remote Fediverse identities (actors)
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"""
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class Restriction(models.IntegerChoices):
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none = 0
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limited = 1
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blocked = 2
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ACTOR_TYPES = ["person", "service", "application", "group", "organization"]
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# The Actor URI is essentially also a PK - we keep the default numeric
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# one around as well for making nice URLs etc.
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actor_uri = models.CharField(max_length=500, unique=True)
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state = StateField(IdentityStates)
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local = models.BooleanField()
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users = models.ManyToManyField(
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"users.User",
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related_name="identities",
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blank=True,
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)
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username = models.CharField(max_length=500, blank=True, null=True)
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# Must be a display domain if present
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domain = models.ForeignKey(
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"users.Domain",
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blank=True,
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null=True,
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on_delete=models.PROTECT,
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related_name="identities",
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)
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name = models.CharField(max_length=500, blank=True, null=True)
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summary = models.TextField(blank=True, null=True)
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manually_approves_followers = models.BooleanField(blank=True, null=True)
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discoverable = models.BooleanField(default=True)
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profile_uri = models.CharField(max_length=500, blank=True, null=True)
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inbox_uri = models.CharField(max_length=500, blank=True, null=True)
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shared_inbox_uri = models.CharField(max_length=500, blank=True, null=True)
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outbox_uri = models.CharField(max_length=500, blank=True, null=True)
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icon_uri = models.CharField(max_length=500, blank=True, null=True)
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image_uri = models.CharField(max_length=500, blank=True, null=True)
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followers_uri = models.CharField(max_length=500, blank=True, null=True)
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following_uri = models.CharField(max_length=500, blank=True, null=True)
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actor_type = models.CharField(max_length=100, default="person")
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icon = models.ImageField(
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upload_to=partial(upload_namer, "profile_images"), blank=True, null=True
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)
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image = models.ImageField(
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upload_to=partial(upload_namer, "background_images"), blank=True, null=True
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)
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# Should be a list of {"name":..., "value":...} dicts
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metadata = models.JSONField(blank=True, null=True)
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# Should be a list of object URIs (we don't want a full M2M here)
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pinned = models.JSONField(blank=True, null=True)
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# Admin-only moderation fields
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sensitive = models.BooleanField(default=False)
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restriction = models.IntegerField(
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choices=Restriction.choices, default=Restriction.none
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)
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admin_notes = models.TextField(null=True, blank=True)
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private_key = models.TextField(null=True, blank=True)
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public_key = models.TextField(null=True, blank=True)
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public_key_id = models.TextField(null=True, blank=True)
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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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fetched = models.DateTimeField(null=True, blank=True)
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deleted = models.DateTimeField(null=True, blank=True)
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objects = IdentityManager()
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### Model attributes ###
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class Meta:
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verbose_name_plural = "identities"
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unique_together = [("username", "domain")]
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class urls(urlman.Urls):
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view = "/@{self.username}@{self.domain_id}/"
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action = "{view}action/"
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followers = "{view}followers/"
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following = "{view}following/"
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activate = "{view}activate/"
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admin = "/admin/identities/"
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admin_edit = "{admin}{self.pk}/"
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def get_scheme(self, url):
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return "https"
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def get_hostname(self, url):
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return self.instance.domain.uri_domain
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def __str__(self):
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if self.username and self.domain_id:
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return self.handle
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return self.actor_uri
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def absolute_profile_uri(self):
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"""
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Returns a profile URI that is always absolute, for sending out to
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other servers.
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"""
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if self.local:
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return f"https://{self.domain.uri_domain}/@{self.username}/"
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else:
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return self.profile_uri
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def all_absolute_profile_uris(self) -> list[str]:
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"""
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Returns alist of profile URIs that are always absolute. For local addresses,
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this includes the short and long form URIs.
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"""
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if not self.local:
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return [self.profile_uri]
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return [
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f"https://{self.domain.uri_domain}/@{self.username}/",
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f"https://{self.domain.uri_domain}/@{self.username}@{self.domain_id}/",
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]
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def local_icon_url(self) -> RelativeAbsoluteUrl:
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"""
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Returns an icon for use by us, with fallbacks to a placeholder
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"""
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if self.icon:
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return RelativeAbsoluteUrl(self.icon.url)
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elif self.icon_uri:
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return AutoAbsoluteUrl(f"/proxy/identity_icon/{self.pk}/")
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else:
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return StaticAbsoluteUrl("img/unknown-icon-128.png")
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def local_image_url(self) -> RelativeAbsoluteUrl | None:
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"""
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Returns a background image for us, returning None if there isn't one
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"""
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if self.image:
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return AutoAbsoluteUrl(self.image.url)
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elif self.image_uri:
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return AutoAbsoluteUrl(f"/proxy/identity_image/{self.pk}/")
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return None
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@property
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def safe_summary(self):
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return ContentRenderer(local=True).render_identity_summary(self.summary, self)
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@property
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def safe_metadata(self):
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renderer = ContentRenderer(local=True)
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if not self.metadata:
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return []
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return [
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{
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"name": renderer.render_identity_data(data["name"], self, strip=True),
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"value": renderer.render_identity_data(data["value"], self, strip=True),
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}
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for data in self.metadata
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]
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### Alternate constructors/fetchers ###
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@classmethod
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def by_username_and_domain(cls, username, domain, fetch=False, local=False):
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if username.startswith("@"):
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raise ValueError("Username must not start with @")
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domain = domain.lower()
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try:
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if local:
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return cls.objects.get(
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username__iexact=username,
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domain_id=domain,
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local=True,
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)
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else:
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return cls.objects.get(
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username__iexact=username,
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domain_id=domain,
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)
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except cls.DoesNotExist:
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if fetch and not local:
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actor_uri, handle = async_to_sync(cls.fetch_webfinger)(
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f"{username}@{domain}"
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)
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if handle is None:
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return None
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# See if this actually does match an existing actor
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try:
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return cls.objects.get(actor_uri=actor_uri)
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except cls.DoesNotExist:
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pass
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# OK, make one
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username, domain = handle.split("@")
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domain = Domain.get_remote_domain(domain)
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return cls.objects.create(
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actor_uri=actor_uri,
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username=username,
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domain_id=domain,
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local=False,
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)
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return None
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@classmethod
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def by_actor_uri(cls, uri, create=False, transient=False) -> "Identity":
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try:
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return cls.objects.get(actor_uri=uri)
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except cls.DoesNotExist:
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if create:
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if transient:
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# Some code (like inbox fetching) doesn't need this saved
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# to the DB until the fetch succeeds
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return cls(actor_uri=uri, local=False)
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else:
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return cls.objects.create(actor_uri=uri, local=False)
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else:
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raise cls.DoesNotExist(f"No identity found with actor_uri {uri}")
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### Dynamic properties ###
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@property
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def name_or_handle(self):
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return self.name or self.handle
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@cached_property
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def html_name_or_handle(self):
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"""
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Return the name_or_handle with any HTML substitutions made
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"""
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return ContentRenderer(local=True).render_identity_data(
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self.name_or_handle, self, strip=True
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)
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@property
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def handle(self):
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if self.username is None:
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return "(unknown user)"
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if self.domain_id:
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return f"{self.username}@{self.domain_id}"
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return f"{self.username}@(unknown server)"
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@property
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def data_age(self) -> float:
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"""
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How old our copy of this data is, in seconds
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"""
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if self.local:
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return 0
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if self.fetched is None:
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return 10000000000
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return (timezone.now() - self.fetched).total_seconds()
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@property
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def outdated(self) -> bool:
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# TODO: Setting
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return self.data_age > 60 * 24 * 24
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@property
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def blocked(self) -> bool:
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return self.restriction == self.Restriction.blocked
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@property
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def limited(self) -> bool:
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return self.restriction == self.Restriction.limited
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### Async helpers ###
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async def afetch_full(self):
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"""
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Returns a version of the object with all relations pre-loaded
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"""
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return await Identity.objects.select_related("domain").aget(pk=self.pk)
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### ActivityPub (outbound) ###
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def to_webfinger(self):
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aliases = [self.absolute_profile_uri()]
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actor_links = []
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if self.restriction != Identity.Restriction.blocked:
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# Blocked users don't get a profile page
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actor_links.append(
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{
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"rel": "http://webfinger.net/rel/profile-page",
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"type": "text/html",
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"href": self.absolute_profile_uri(),
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},
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)
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# TODO: How to handle Restriction.limited and Restriction.blocked?
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# Exposing the activity+json will allow migrating off server
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actor_links.extend(
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[
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{
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"rel": "self",
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"type": "application/activity+json",
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"href": self.actor_uri,
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}
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]
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)
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return {
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"subject": f"acct:{self.handle}",
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"aliases": aliases,
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"links": actor_links,
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}
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def to_ap(self):
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response = {
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"id": self.actor_uri,
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"type": self.actor_type.title(),
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"inbox": self.actor_uri + "inbox/",
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"outbox": self.actor_uri + "outbox/",
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"preferredUsername": self.username,
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"publicKey": {
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"id": self.public_key_id,
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"owner": self.actor_uri,
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"publicKeyPem": self.public_key,
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},
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"published": self.created.strftime("%Y-%m-%dT%H:%M:%SZ"),
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"url": self.absolute_profile_uri(),
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"toot:discoverable": self.discoverable,
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}
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if self.name:
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response["name"] = self.name
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if self.summary:
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response["summary"] = str(linebreaks_filter(self.summary))
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if self.icon:
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response["icon"] = {
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"type": "Image",
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"mediaType": media_type_from_filename(self.icon.name),
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"url": self.icon.url,
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}
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if self.image:
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response["image"] = {
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"type": "Image",
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"mediaType": media_type_from_filename(self.image.name),
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"url": self.image.url,
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}
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if self.local:
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response["endpoints"] = {
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"sharedInbox": f"https://{self.domain.uri_domain}/inbox/",
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}
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return response
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def to_ap_tag(self):
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"""
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Return this Identity as an ActivityPub Tag
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"""
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return {
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"href": self.actor_uri,
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"name": "@" + self.handle,
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"type": "Mention",
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}
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def to_update_ap(self):
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"""
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Returns the AP JSON to update this object
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"""
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object = self.to_ap()
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return {
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"type": "Update",
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"id": self.actor_uri + "#update",
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"actor": self.actor_uri,
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"object": object,
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}
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def to_delete_ap(self):
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"""
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Returns the AP JSON to delete this object
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"""
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object = self.to_ap()
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return {
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"type": "Delete",
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"id": self.actor_uri + "#delete",
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"actor": self.actor_uri,
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"object": object,
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}
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### ActivityPub (inbound) ###
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@classmethod
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def handle_update_ap(cls, data):
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"""
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Takes an incoming update.person message and just forces us to add it
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to our fetch queue (don't want to bother with two load paths right now)
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"""
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# Find by actor
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try:
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actor = cls.by_actor_uri(data["actor"])
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actor.transition_perform(IdentityStates.outdated)
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except cls.DoesNotExist:
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pass
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|
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@classmethod
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def handle_delete_ap(cls, data):
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"""
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Takes an incoming update.person message and just forces us to add it
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to our fetch queue (don't want to bother with two load paths right now)
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"""
|
|
# Assert that the actor matches the object
|
|
if data["actor"] != data["object"]:
|
|
raise ActorMismatchError(
|
|
f"Actor {data['actor']} trying to delete identity {data['object']}"
|
|
)
|
|
# Find by actor
|
|
try:
|
|
actor = cls.by_actor_uri(data["actor"])
|
|
actor.delete()
|
|
except cls.DoesNotExist:
|
|
pass
|
|
|
|
### Actor/Webfinger fetching ###
|
|
|
|
@classmethod
|
|
async def fetch_webfinger(cls, handle: str) -> tuple[str | None, str | None]:
|
|
"""
|
|
Given a username@domain handle, returns a tuple of
|
|
(actor uri, canonical handle) or None, None if it does not resolve.
|
|
"""
|
|
domain = handle.split("@")[1].lower()
|
|
webfinger_url = "https://{domain}/.well-known/webfinger?resource={uri}"
|
|
|
|
try:
|
|
async with httpx.AsyncClient(
|
|
timeout=settings.SETUP.REMOTE_TIMEOUT
|
|
) as client:
|
|
response = await client.get(
|
|
f"https://{domain}/.well-known/host-meta",
|
|
follow_redirects=True,
|
|
)
|
|
|
|
# In the case of anything other than a success, we'll still try
|
|
# hitting the webfinger URL on the domain we were given to handle
|
|
# incorrectly setup servers.
|
|
if response.status_code == 200 and response.content.strip():
|
|
tree = etree.fromstring(response.content)
|
|
template = tree.xpath(
|
|
"string(.//*[local-name() = 'Link' and @rel='lrdd']/@template)"
|
|
)
|
|
if template:
|
|
webfinger_url = template
|
|
except (httpx.RequestError, etree.ParseError):
|
|
pass
|
|
|
|
try:
|
|
async with httpx.AsyncClient(
|
|
timeout=settings.SETUP.REMOTE_TIMEOUT
|
|
) as client:
|
|
response = await client.get(
|
|
webfinger_url.format(domain=domain, uri=f"acct:{handle}"),
|
|
follow_redirects=True,
|
|
)
|
|
except httpx.RequestError:
|
|
return None, None
|
|
|
|
if response.status_code in [404, 410]:
|
|
return None, None
|
|
if response.status_code >= 500:
|
|
return None, None
|
|
if response.status_code >= 400:
|
|
raise ValueError(
|
|
f"Client error fetching webfinger: {response.status_code}",
|
|
response.content,
|
|
)
|
|
try:
|
|
data = response.json()
|
|
except ValueError:
|
|
# Some servers return these with a 200 status code!
|
|
if b"not found" in response.content.lower():
|
|
return None, None
|
|
raise ValueError(
|
|
"JSON parse error fetching webfinger",
|
|
response.content,
|
|
)
|
|
if data["subject"].startswith("acct:"):
|
|
data["subject"] = data["subject"][5:]
|
|
for link in data["links"]:
|
|
if (
|
|
link.get("type") == "application/activity+json"
|
|
and link.get("rel") == "self"
|
|
):
|
|
return link["href"], data["subject"]
|
|
return None, None
|
|
|
|
async def fetch_actor(self) -> bool:
|
|
"""
|
|
Fetches the user's actor information, as well as their domain from
|
|
webfinger if it's available.
|
|
"""
|
|
from activities.models import Emoji
|
|
|
|
if self.local:
|
|
raise ValueError("Cannot fetch local identities")
|
|
try:
|
|
response = await SystemActor().signed_request(
|
|
method="get",
|
|
uri=self.actor_uri,
|
|
)
|
|
except httpx.RequestError:
|
|
return False
|
|
if response.status_code == 410:
|
|
# Their account got deleted, so let's do the same.
|
|
if self.pk:
|
|
await Identity.objects.filter(pk=self.pk).adelete()
|
|
return False
|
|
if response.status_code == 404:
|
|
# We don't trust this as much as 410 Gone, but skip for now
|
|
return False
|
|
if response.status_code >= 500:
|
|
return False
|
|
if response.status_code >= 400:
|
|
raise ValueError(
|
|
f"Client error fetching actor: {response.status_code}", response.content
|
|
)
|
|
document = canonicalise(response.json(), include_security=True)
|
|
if "type" not in document:
|
|
return False
|
|
self.name = document.get("name")
|
|
self.profile_uri = document.get("url")
|
|
self.inbox_uri = document.get("inbox")
|
|
self.outbox_uri = document.get("outbox")
|
|
self.followers_uri = document.get("followers")
|
|
self.following_uri = document.get("following")
|
|
self.actor_type = document["type"].lower()
|
|
self.shared_inbox_uri = document.get("endpoints", {}).get("sharedInbox")
|
|
self.summary = document.get("summary")
|
|
self.username = document.get("preferredUsername")
|
|
if self.username and "@value" in self.username:
|
|
self.username = self.username["@value"]
|
|
if self.username:
|
|
self.username = self.username
|
|
self.manually_approves_followers = document.get("manuallyApprovesFollowers")
|
|
self.public_key = document.get("publicKey", {}).get("publicKeyPem")
|
|
self.public_key_id = document.get("publicKey", {}).get("id")
|
|
# Sometimes the public key PEM is in a language construct?
|
|
if isinstance(self.public_key, dict):
|
|
self.public_key = self.public_key["@value"]
|
|
self.icon_uri = get_first_image_url(document.get("icon", None))
|
|
self.image_uri = get_first_image_url(document.get("image", None))
|
|
self.discoverable = document.get("toot:discoverable", True)
|
|
# Profile links/metadata
|
|
self.metadata = []
|
|
for attachment in get_list(document, "attachment"):
|
|
if (
|
|
attachment["type"] == "http://schema.org#PropertyValue"
|
|
and "name" in attachment
|
|
and "http://schema.org#value" in attachment
|
|
):
|
|
self.metadata.append(
|
|
{
|
|
"name": attachment.get("name"),
|
|
"value": strip_html(attachment.get("http://schema.org#value")),
|
|
}
|
|
)
|
|
# Now go do webfinger with that info to see if we can get a canonical domain
|
|
actor_url_parts = urlparse(self.actor_uri)
|
|
get_domain = sync_to_async(Domain.get_remote_domain)
|
|
if self.username:
|
|
webfinger_actor, webfinger_handle = await self.fetch_webfinger(
|
|
f"{self.username}@{actor_url_parts.hostname}"
|
|
)
|
|
if webfinger_handle:
|
|
webfinger_username, webfinger_domain = webfinger_handle.split("@")
|
|
self.username = webfinger_username
|
|
self.domain = await get_domain(webfinger_domain)
|
|
else:
|
|
self.domain = await get_domain(actor_url_parts.hostname)
|
|
else:
|
|
self.domain = await get_domain(actor_url_parts.hostname)
|
|
# Emojis (we need the domain so we do them here)
|
|
for tag in get_list(document, "tag"):
|
|
if tag["type"].lower() == "toot:emoji":
|
|
await sync_to_async(Emoji.by_ap_tag)(self.domain, tag, create=True)
|
|
# Mark as fetched
|
|
self.fetched = timezone.now()
|
|
try:
|
|
await sync_to_async(self.save)()
|
|
except IntegrityError as e:
|
|
# See if we can fetch a PK and save there
|
|
if self.pk is None:
|
|
try:
|
|
other_row = await Identity.objects.aget(actor_uri=self.actor_uri)
|
|
except Identity.DoesNotExist:
|
|
raise ValueError(
|
|
f"Could not save Identity at end of actor fetch: {e}"
|
|
)
|
|
self.pk: int | None = other_row.pk
|
|
await sync_to_async(self.save)()
|
|
return True
|
|
|
|
### Mastodon Client API ###
|
|
|
|
def to_mastodon_json(self):
|
|
from activities.models import Emoji
|
|
|
|
header_image = self.local_image_url()
|
|
metadata_value_text = (
|
|
" ".join([m["value"] for m in self.metadata]) if self.metadata else ""
|
|
)
|
|
emojis = Emoji.emojis_from_content(
|
|
f"{self.name} {self.summary} {metadata_value_text}", self.domain
|
|
)
|
|
return {
|
|
"id": self.pk,
|
|
"username": self.username or "",
|
|
"acct": self.username if self.local else self.handle,
|
|
"url": self.absolute_profile_uri() or "",
|
|
"display_name": self.name or "",
|
|
"note": self.summary or "",
|
|
"avatar": self.local_icon_url().absolute,
|
|
"avatar_static": self.local_icon_url().absolute,
|
|
"header": header_image.absolute if header_image else None,
|
|
"header_static": header_image.absolute if header_image else None,
|
|
"locked": False,
|
|
"fields": (
|
|
[
|
|
{"name": m["name"], "value": m["value"], "verified_at": None}
|
|
for m in self.metadata
|
|
]
|
|
if self.metadata
|
|
else []
|
|
),
|
|
"emojis": [emoji.to_mastodon_json() for emoji in emojis],
|
|
"bot": False,
|
|
"group": False,
|
|
"discoverable": self.discoverable,
|
|
"suspended": False,
|
|
"limited": False,
|
|
"created_at": format_ld_date(
|
|
self.created.replace(hour=0, minute=0, second=0, microsecond=0)
|
|
),
|
|
"last_status_at": None, # TODO: populate
|
|
"statuses_count": self.posts.count(),
|
|
"followers_count": self.inbound_follows.count(),
|
|
"following_count": self.outbound_follows.count(),
|
|
}
|
|
|
|
### Cryptography ###
|
|
|
|
async def signed_request(
|
|
self,
|
|
method: Literal["get", "post"],
|
|
uri: str,
|
|
body: dict | None = None,
|
|
):
|
|
"""
|
|
Performs a signed request on behalf of the System Actor.
|
|
"""
|
|
return await HttpSignature.signed_request(
|
|
method=method,
|
|
uri=uri,
|
|
body=body,
|
|
private_key=self.private_key,
|
|
key_id=self.public_key_id,
|
|
)
|
|
|
|
def generate_keypair(self):
|
|
if not self.local:
|
|
raise ValueError("Cannot generate keypair for remote user")
|
|
self.private_key, self.public_key = RsaKeys.generate_keypair()
|
|
self.public_key_id = self.actor_uri + "#main-key"
|
|
self.save()
|
|
|
|
### Config ###
|
|
|
|
@cached_property
|
|
def config_identity(self) -> Config.IdentityOptions:
|
|
return Config.load_identity(self)
|
|
|
|
def lazy_config_value(self, key: str):
|
|
"""
|
|
Lazily load a config value for this Identity
|
|
"""
|
|
if key not in Config.IdentityOptions.__fields__:
|
|
raise KeyError(f"Undefined IdentityOption for {key}")
|
|
return lazy(lambda: getattr(self.config_identity, key))
|