takahe/users/models/identity.py

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from functools import cached_property, partial
from typing import Literal
from urllib.parse import urlparse
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import httpx
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import urlman
from asgiref.sync import async_to_sync, sync_to_async
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 core.exceptions import ActorMismatchError
from core.html import ContentRenderer, strip_html
from core.ld import (
canonicalise,
format_ld_date,
get_first_image_url,
get_list,
media_type_from_filename,
)
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from core.models import Config
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
from stator.models import State, StateField, StateGraph, StatorModel
from users.models.domain import Domain
from users.models.system_actor import SystemActor
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class IdentityStates(StateGraph):
"""
Identities sit in "updated" for up to system.identity_max_age, and then
go back to "outdated" for refetching.
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When a local identity is "edited" or "deleted", it will fanout the change to
all followers and transition to "updated"
"""
outdated = State(try_interval=3600, force_initial=True)
updated = State(try_interval=86400 * 7, attempt_immediately=False)
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edited = State(try_interval=300, attempt_immediately=True)
deleted = State(try_interval=300, attempt_immediately=True)
deleted_fanned_out = State(externally_progressed=True)
deleted.transitions_to(deleted_fanned_out)
edited.transitions_to(updated)
updated.transitions_to(edited)
edited.transitions_to(deleted)
outdated.transitions_to(updated)
updated.transitions_to(outdated)
@classmethod
def group_deleted(cls):
return [cls.deleted, cls.deleted_fanned_out]
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@classmethod
async def targets_fan_out(cls, identity: "Identity", type_: str) -> None:
from activities.models import FanOut
from users.models import Follow
# Fan out to each target
shared_inboxes = set()
async for follower in Follow.objects.select_related("source", "target").filter(
target=identity
):
# Dedupe shared_inbox_uri
shared_uri = follower.source.shared_inbox_uri
if shared_uri and shared_uri in shared_inboxes:
continue
await FanOut.objects.acreate(
identity=follower.source,
type=type_,
subject_identity=identity,
)
shared_inboxes.add(shared_uri)
@classmethod
async def handle_edited(cls, instance: "Identity"):
from activities.models import FanOut
if not instance.local:
return cls.updated
identity = await instance.afetch_full()
await cls.targets_fan_out(identity, FanOut.Types.identity_edited)
return cls.updated
@classmethod
async def handle_deleted(cls, instance: "Identity"):
from activities.models import FanOut
if not instance.local:
return cls.updated
identity = await instance.afetch_full()
await cls.targets_fan_out(identity, FanOut.Types.identity_deleted)
return cls.deleted_fanned_out
@classmethod
async def handle_outdated(cls, identity: "Identity"):
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# Local identities never need fetching
if identity.local:
return cls.updated
# Run the actor fetch and progress to updated if it succeeds
if await identity.fetch_actor():
return cls.updated
@classmethod
async def handle_updated(cls, instance: "Identity"):
if instance.state_age > Config.system.identity_max_age:
return cls.outdated
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class IdentityQuerySet(models.QuerySet):
def not_deleted(self):
query = self.exclude(state__in=IdentityStates.group_deleted())
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return query
class IdentityManager(models.Manager):
def get_queryset(self):
return IdentityQuerySet(self.model, using=self._db)
def not_deleted(self):
return self.get_queryset().not_deleted()
class Identity(StatorModel):
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"""
Represents both local and remote Fediverse identities (actors)
"""
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class Restriction(models.IntegerChoices):
none = 0
limited = 1
blocked = 2
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ACTOR_TYPES = ["person", "service", "application", "group", "organization"]
# The Actor URI is essentially also a PK - we keep the default numeric
# one around as well for making nice URLs etc.
actor_uri = models.CharField(max_length=500, unique=True)
state = StateField(IdentityStates)
local = models.BooleanField()
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users = models.ManyToManyField(
"users.User",
related_name="identities",
blank=True,
)
username = models.CharField(max_length=500, blank=True, null=True)
# Must be a display domain if present
domain = models.ForeignKey(
"users.Domain",
blank=True,
null=True,
on_delete=models.PROTECT,
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related_name="identities",
)
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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)
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)
inbox_uri = models.CharField(max_length=500, blank=True, null=True)
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)
icon_uri = models.CharField(max_length=500, blank=True, null=True)
image_uri = models.CharField(max_length=500, blank=True, null=True)
followers_uri = models.CharField(max_length=500, blank=True, null=True)
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(
upload_to=partial(upload_namer, "profile_images"), blank=True, null=True
)
image = models.ImageField(
upload_to=partial(upload_namer, "background_images"), blank=True, null=True
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)
# Should be a list of {"name":..., "value":...} dicts
metadata = models.JSONField(blank=True, null=True)
# Should be a list of object URIs (we don't want a full M2M here)
pinned = models.JSONField(blank=True, null=True)
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# Admin-only moderation fields
sensitive = models.BooleanField(default=False)
restriction = models.IntegerField(
choices=Restriction.choices, default=Restriction.none
)
admin_notes = models.TextField(null=True, blank=True)
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private_key = models.TextField(null=True, blank=True)
public_key = models.TextField(null=True, blank=True)
public_key_id = models.TextField(null=True, blank=True)
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created = models.DateTimeField(auto_now_add=True)
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()
### Model attributes ###
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class Meta:
verbose_name_plural = "identities"
unique_together = [("username", "domain")]
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class urls(urlman.Urls):
view = "/@{self.username}@{self.domain_id}/"
action = "{view}action/"
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followers = "{view}followers/"
following = "{view}following/"
activate = "{view}activate/"
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admin = "/admin/identities/"
admin_edit = "{admin}{self.pk}/"
def get_scheme(self, url):
return "https"
def get_hostname(self, url):
return self.instance.domain.uri_domain
def __str__(self):
if self.username and self.domain_id:
return self.handle
return self.actor_uri
def absolute_profile_uri(self):
"""
Returns a profile URI that is always absolute, for sending out to
other servers.
"""
if self.local:
return f"https://{self.domain.uri_domain}/@{self.username}/"
else:
return self.profile_uri
def all_absolute_profile_uris(self) -> list[str]:
"""
Returns alist of profile URIs that are always absolute. For local addresses,
this includes the short and long form URIs.
"""
if not self.local:
return [self.profile_uri]
return [
f"https://{self.domain.uri_domain}/@{self.username}/",
f"https://{self.domain.uri_domain}/@{self.username}@{self.domain_id}/",
]
def local_icon_url(self) -> RelativeAbsoluteUrl:
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"""
Returns an icon for use by us, with fallbacks to a placeholder
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"""
if self.icon:
return RelativeAbsoluteUrl(self.icon.url)
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elif self.icon_uri:
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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"""
Returns a background image for us, returning None if there isn't one
"""
if self.image:
return RelativeAbsoluteUrl(self.image.url)
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elif self.image_uri:
return AutoAbsoluteUrl(f"/proxy/identity_image/{self.pk}/")
return None
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@property
def safe_summary(self):
return ContentRenderer(local=True).render_identity_summary(self.summary, self)
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@property
def safe_metadata(self):
renderer = ContentRenderer(local=True)
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if not self.metadata:
return []
return [
{
"name": renderer.render_identity_data(data["name"], self, strip=True),
"value": renderer.render_identity_data(data["value"], self, strip=True),
}
for data in self.metadata
]
### Alternate constructors/fetchers ###
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@classmethod
def by_username_and_domain(cls, username, domain, fetch=False, local=False):
if username.startswith("@"):
raise ValueError("Username must not start with @")
domain = domain.lower()
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try:
if local:
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return cls.objects.get(
username__iexact=username,
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domain_id=domain,
local=True,
)
else:
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return cls.objects.get(
username__iexact=username,
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domain_id=domain,
)
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except cls.DoesNotExist:
if fetch and not local:
actor_uri, handle = async_to_sync(cls.fetch_webfinger)(
f"{username}@{domain}"
)
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if handle is None:
return None
# See if this actually does match an existing actor
try:
return cls.objects.get(actor_uri=actor_uri)
except cls.DoesNotExist:
pass
# OK, make one
username, domain = handle.split("@")
domain = Domain.get_remote_domain(domain)
return cls.objects.create(
actor_uri=actor_uri,
username=username,
domain_id=domain,
local=False,
)
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return None
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@classmethod
def by_actor_uri(cls, uri, create=False, transient=False) -> "Identity":
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try:
return cls.objects.get(actor_uri=uri)
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except cls.DoesNotExist:
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if create:
if transient:
# Some code (like inbox fetching) doesn't need this saved
# to the DB until the fetch succeeds
return cls(actor_uri=uri, local=False)
else:
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}")
### Dynamic properties ###
@property
def name_or_handle(self):
return self.name or self.handle
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@cached_property
def html_name_or_handle(self):
"""
Return the name_or_handle with any HTML substitutions made
"""
return ContentRenderer(local=True).render_identity_data(
self.name_or_handle, self, strip=True
)
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@property
def handle(self):
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if self.username is None:
return "(unknown user)"
if self.domain_id:
return f"{self.username}@{self.domain_id}"
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return f"{self.username}@(unknown server)"
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@property
def data_age(self) -> float:
"""
How old our copy of this data is, in seconds
"""
if self.local:
return 0
if self.fetched is None:
return 10000000000
return (timezone.now() - self.fetched).total_seconds()
@property
def outdated(self) -> bool:
# TODO: Setting
return self.data_age > 60 * 24 * 24
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@property
def blocked(self) -> bool:
return self.restriction == self.Restriction.blocked
@property
def limited(self) -> bool:
return self.restriction == self.Restriction.limited
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### Async helpers ###
async def afetch_full(self):
"""
Returns a version of the object with all relations pre-loaded
"""
return await Identity.objects.select_related("domain").aget(pk=self.pk)
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### ActivityPub (outbound) ###
def to_webfinger(self):
aliases = self.all_absolute_profile_uris()
actor_links = []
if self.restriction != Identity.Restriction.blocked:
# Blocked users don't get a profile page
actor_links.append(
{
"rel": "http://webfinger.net/rel/profile-page",
"type": "text/html",
"href": self.absolute_profile_uri(),
},
)
# TODO: How to handle Restriction.limited and Restriction.blocked?
# Exposing the activity+json will allow migrating off server
actor_links.extend(
[
{"rel": "self", "type": "application/activity+json", "href": alias_uri}
for alias_uri in aliases
]
)
return {
"subject": f"acct:{self.handle}",
"aliases": aliases,
"links": actor_links,
}
def to_ap(self):
response = {
"id": self.actor_uri,
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"type": self.actor_type.title(),
"inbox": self.actor_uri + "inbox/",
"outbox": self.actor_uri + "outbox/",
"preferredUsername": self.username,
"publicKey": {
"id": self.public_key_id,
"owner": self.actor_uri,
"publicKeyPem": self.public_key,
},
"published": self.created.strftime("%Y-%m-%dT%H:%M:%SZ"),
"url": self.absolute_profile_uri(),
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"toot:discoverable": self.discoverable,
}
if self.name:
response["name"] = self.name
if self.summary:
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response["summary"] = str(linebreaks_filter(self.summary))
if self.icon:
response["icon"] = {
"type": "Image",
"mediaType": media_type_from_filename(self.icon.name),
"url": self.icon.url,
}
if self.image:
response["image"] = {
"type": "Image",
"mediaType": media_type_from_filename(self.image.name),
"url": self.image.url,
}
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if self.local:
response["endpoints"] = {
"sharedInbox": f"https://{self.domain.uri_domain}/inbox/",
}
return response
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def to_ap_tag(self):
"""
Return this Identity as an ActivityPub Tag
"""
return {
"href": self.actor_uri,
"name": "@" + self.handle,
"type": "Mention",
}
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def to_update_ap(self):
"""
Returns the AP JSON to update this object
"""
object = self.to_ap()
return {
"type": "Update",
"id": self.actor_uri + "#update",
"actor": self.actor_uri,
"object": object,
}
def to_delete_ap(self):
"""
Returns the AP JSON to delete this object
"""
object = self.to_ap()
return {
"type": "Delete",
"id": self.actor_uri + "#delete",
"actor": self.actor_uri,
"object": object,
}
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### ActivityPub (inbound) ###
@classmethod
def handle_update_ap(cls, data):
"""
Takes an incoming update.person message and just forces us to add it
to our fetch queue (don't want to bother with two load paths right now)
"""
# Find by actor
try:
actor = cls.by_actor_uri(data["actor"])
actor.transition_perform(IdentityStates.outdated)
except cls.DoesNotExist:
pass
@classmethod
def handle_delete_ap(cls, data):
"""
Takes an incoming update.person message and just forces us to add it
to our fetch queue (don't want to bother with two load paths right now)
"""
# 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 ###
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@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()
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try:
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async with httpx.AsyncClient() as client:
response = await client.get(
f"https://{domain}/.well-known/webfinger?resource=acct:{handle}",
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follow_redirects=True,
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)
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except httpx.RequestError:
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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,
)
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try:
data = response.json()
except ValueError:
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# Some servers return these with a 200 status code!
if b"not found" in response.content.lower():
return None, None
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raise ValueError(
"JSON parse error fetching webfinger",
response.content,
)
if data["subject"].startswith("acct:"):
data["subject"] = data["subject"][5:]
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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
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async def fetch_actor(self) -> bool:
"""
Fetches the user's actor information, as well as their domain from
webfinger if it's available.
"""
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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,
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)
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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")
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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
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self.manually_approves_followers = document.get("manuallyApprovesFollowers")
self.public_key = document.get("publicKey", {}).get("publicKeyPem")
self.public_key_id = document.get("publicKey", {}).get("id")
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# 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))
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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)
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# 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)()
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return True
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### Mastodon Client API ###
def to_mastodon_json(self):
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from activities.models import Emoji
header_image = self.local_image_url()
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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
)
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return {
"id": self.pk,
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"username": self.username or "",
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"acct": self.username if self.local else self.handle,
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"url": self.absolute_profile_uri() or "",
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"display_name": self.name or "",
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"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,
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"locked": False,
"fields": (
[
{"name": m["name"], "value": m["value"], "verified_at": None}
for m in self.metadata
]
if self.metadata
else []
),
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"emojis": [emoji.to_mastodon_json() for emoji in emojis],
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"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()
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self.public_key_id = self.actor_uri + "#main-key"
self.save()
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### 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))