452 lines
16 KiB
Python
452 lines
16 KiB
Python
from functools import cached_property, partial
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from typing import Dict, Literal, Optional, Tuple
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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.db import IntegrityError, models
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from django.template.defaultfilters import linebreaks_filter
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from django.templatetags.static import static
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from django.utils import timezone
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from django.utils.functional import lazy
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from core.exceptions import ActorMismatchError
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from core.html import sanitize_post
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from core.ld import canonicalise, media_type_from_filename
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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 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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outdated = State(try_interval=3600)
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updated = State()
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outdated.transitions_to(updated)
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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 "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 "updated"
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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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# 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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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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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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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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### 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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activate = "{view}activate/"
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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 local_icon_url(self):
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"""
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Returns an icon for us, with fallbacks to a placeholder
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"""
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if self.icon:
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return self.icon.url
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elif self.icon_uri:
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return self.icon_uri
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else:
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return static("img/unknown-icon-128.png")
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def local_image_url(self):
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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 self.image.url
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elif self.image_uri:
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return self.image_uri
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@property
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def safe_summary(self):
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return sanitize_post(self.summary)
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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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username = username.lower()
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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(username=username, domain_id=domain, local=True)
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else:
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return cls.objects.get(username=username, domain_id=domain)
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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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@property
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def handle(self):
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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.invalid"
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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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### ActivityPub (outbound) ###
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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": "Person",
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"inbox": self.actor_uri + "inbox/",
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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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"http://joinmastodon.org/ns#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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return response
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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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@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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"""
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# Assert that the actor matches the object
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if data["actor"] != data["object"]:
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raise ActorMismatchError(
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f"Actor {data['actor']} trying to delete identity {data['object']}"
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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.delete()
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except cls.DoesNotExist:
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pass
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### Actor/Webfinger fetching ###
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@classmethod
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async def fetch_webfinger(cls, handle: str) -> Tuple[Optional[str], Optional[str]]:
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"""
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Given a username@domain handle, returns a tuple of
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(actor uri, canonical handle) or None, None if it does not resolve.
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"""
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domain = handle.split("@")[1].lower()
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try:
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response = await SystemActor().signed_request(
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method="get",
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uri=f"https://{domain}/.well-known/webfinger?resource=acct:{handle}",
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)
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except (httpx.RequestError, httpx.ConnectError):
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return None, None
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if response.status_code in [404, 410]:
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return None, None
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if response.status_code >= 500:
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return None, None
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if response.status_code >= 400:
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raise ValueError(
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f"Client error fetching webfinger: {response.status_code}",
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response.content,
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)
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data = response.json()
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if data["subject"].startswith("acct:"):
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data["subject"] = data["subject"][5:]
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for link in data["links"]:
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if (
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link.get("type") == "application/activity+json"
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and link.get("rel") == "self"
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):
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return link["href"], data["subject"]
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return None, None
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async def fetch_actor(self) -> bool:
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"""
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Fetches the user's actor information, as well as their domain from
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webfinger if it's available.
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"""
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if self.local:
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raise ValueError("Cannot fetch local identities")
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try:
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response = await SystemActor().signed_request(
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method="get",
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uri=self.actor_uri,
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)
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except (httpx.ConnectError, httpx.RequestError):
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return False
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if response.status_code == 410:
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# Their account got deleted, so let's do the same.
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if self.pk:
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await Identity.objects.filter(pk=self.pk).adelete()
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return False
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if response.status_code == 404:
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# We don't trust this as much as 410 Gone, but skip for now
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return False
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if response.status_code >= 500:
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return False
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if response.status_code >= 400:
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raise ValueError(
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f"Client error fetching actor: {response.status_code}", response.content
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)
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document = canonicalise(response.json(), include_security=True)
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self.name = document.get("name")
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self.profile_uri = document.get("url")
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self.inbox_uri = document.get("inbox")
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self.outbox_uri = document.get("outbox")
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self.summary = document.get("summary")
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self.username = document.get("preferredUsername")
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if self.username and "@value" in self.username:
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self.username = self.username["@value"]
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if self.username:
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self.username = self.username.lower()
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self.manually_approves_followers = document.get("as:manuallyApprovesFollowers")
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self.public_key = document.get("publicKey", {}).get("publicKeyPem")
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self.public_key_id = document.get("publicKey", {}).get("id")
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self.icon_uri = document.get("icon", {}).get("url")
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self.image_uri = document.get("image", {}).get("url")
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self.discoverable = document.get(
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"http://joinmastodon.org/ns#discoverable", True
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)
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# Now go do webfinger with that info to see if we can get a canonical domain
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actor_url_parts = urlparse(self.actor_uri)
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get_domain = sync_to_async(Domain.get_remote_domain)
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if self.username:
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webfinger_actor, webfinger_handle = await self.fetch_webfinger(
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f"{self.username}@{actor_url_parts.hostname}"
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)
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if webfinger_handle:
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webfinger_username, webfinger_domain = webfinger_handle.split("@")
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self.username = webfinger_username.lower()
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self.domain = await get_domain(webfinger_domain)
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else:
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self.domain = await get_domain(actor_url_parts.hostname)
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else:
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self.domain = await get_domain(actor_url_parts.hostname)
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self.fetched = timezone.now()
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try:
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await sync_to_async(self.save)()
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except IntegrityError as e:
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# See if we can fetch a PK and save there
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if self.pk is None:
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try:
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other_row = await Identity.objects.aget(actor_uri=self.actor_uri)
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except Identity.DoesNotExist:
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raise ValueError(
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f"Could not save Identity at end of actor fetch: {e}"
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)
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self.pk: Optional[int] = other_row.pk
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await sync_to_async(self.save)()
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return True
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### Cryptography ###
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async def signed_request(
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self,
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method: Literal["get", "post"],
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uri: str,
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body: Optional[Dict] = None,
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):
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"""
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Performs a signed request on behalf of the System Actor.
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"""
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return await HttpSignature.signed_request(
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method=method,
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uri=uri,
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body=body,
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private_key=self.private_key,
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key_id=self.public_key_id,
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)
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def generate_keypair(self):
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if not self.local:
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raise ValueError("Cannot generate keypair for remote user")
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self.private_key, self.public_key = RsaKeys.generate_keypair()
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self.public_key_id = self.actor_uri + "#main-key"
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self.save()
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### Config ###
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@cached_property
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def config_identity(self) -> Config.IdentityOptions:
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return Config.load_identity(self)
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def lazy_config_value(self, key: str):
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"""
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Lazily load a config value for this Identity
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"""
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if key not in Config.IdentityOptions.__fields__:
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raise KeyError(f"Undefined IdentityOption for {key}")
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return lazy(lambda: getattr(self.config_identity, key))
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