takahe/activities/models/post.py

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import re
from collections.abc import Iterable
from typing import Optional
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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
from django.conf import settings
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from django.contrib.postgres.indexes import GinIndex
from django.db import models, transaction
from django.template.defaultfilters import linebreaks_filter
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from django.utils import timezone
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from django.utils.safestring import mark_safe
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from activities.models.emoji import Emoji
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from activities.models.fan_out import FanOut
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from activities.models.hashtag import Hashtag
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from activities.templatetags.emoji_tags import imageify_emojis
from core.html import sanitize_post, strip_html
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from core.ld import canonicalise, format_ld_date, get_list, parse_ld_date
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from stator.models import State, StateField, StateGraph, StatorModel
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from users.models.identity import Identity, IdentityStates
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from users.models.system_actor import SystemActor
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class PostStates(StateGraph):
new = State(try_interval=300)
fanned_out = State(externally_progressed=True)
deleted = State(try_interval=300)
deleted_fanned_out = State()
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edited = State(try_interval=300)
edited_fanned_out = State(externally_progressed=True)
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new.transitions_to(fanned_out)
fanned_out.transitions_to(deleted)
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fanned_out.transitions_to(edited)
deleted.transitions_to(deleted_fanned_out)
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edited.transitions_to(edited_fanned_out)
edited_fanned_out.transitions_to(edited)
edited_fanned_out.transitions_to(deleted)
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@classmethod
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async def targets_fan_out(cls, post: "Post", type_: str) -> None:
# Fan out to each target
for follow in await post.aget_targets():
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await FanOut.objects.acreate(
identity=follow,
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type=type_,
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subject_post=post,
)
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@classmethod
async def handle_new(cls, instance: "Post"):
"""
Creates all needed fan-out objects for a new Post.
"""
post = await instance.afetch_full()
await cls.targets_fan_out(post, FanOut.Types.post)
await post.ensure_hashtags()
return cls.fanned_out
@classmethod
async def handle_deleted(cls, instance: "Post"):
"""
Creates all needed fan-out objects needed to delete a Post.
"""
post = await instance.afetch_full()
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await cls.targets_fan_out(post, FanOut.Types.post_deleted)
return cls.deleted_fanned_out
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@classmethod
async def handle_edited(cls, instance: "Post"):
"""
Creates all needed fan-out objects for an edited Post.
"""
post = await instance.afetch_full()
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await cls.targets_fan_out(post, FanOut.Types.post_edited)
await post.ensure_hashtags()
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return cls.edited_fanned_out
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class PostQuerySet(models.QuerySet):
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def not_hidden(self):
query = self.exclude(
state__in=[PostStates.deleted, PostStates.deleted_fanned_out]
)
return query
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def public(self, include_replies: bool = False):
query = self.filter(
visibility__in=[
Post.Visibilities.public,
Post.Visibilities.local_only,
],
)
if not include_replies:
return query.filter(in_reply_to__isnull=True)
return query
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def local_public(self, include_replies: bool = False):
query = self.filter(
visibility__in=[
Post.Visibilities.public,
Post.Visibilities.local_only,
],
author__local=True,
)
if not include_replies:
return query.filter(in_reply_to__isnull=True)
return query
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def unlisted(self, include_replies: bool = False):
query = self.filter(
visibility__in=[
Post.Visibilities.public,
Post.Visibilities.local_only,
Post.Visibilities.unlisted,
],
)
if not include_replies:
return query.filter(in_reply_to__isnull=True)
return query
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def tagged_with(self, hashtag: str | Hashtag):
if isinstance(hashtag, str):
tag_q = models.Q(hashtags__contains=hashtag)
else:
tag_q = models.Q(hashtags__contains=hashtag.hashtag)
if hashtag.aliases:
for alias in hashtag.aliases:
tag_q |= models.Q(hashtags__contains=alias)
return self.filter(tag_q)
class PostManager(models.Manager):
def get_queryset(self):
return PostQuerySet(self.model, using=self._db)
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def not_hidden(self):
return self.get_queryset().not_hidden()
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def public(self, include_replies: bool = False):
return self.get_queryset().public(include_replies=include_replies)
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def local_public(self, include_replies: bool = False):
return self.get_queryset().local_public(include_replies=include_replies)
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def unlisted(self, include_replies: bool = False):
return self.get_queryset().unlisted(include_replies=include_replies)
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def tagged_with(self, hashtag: str | Hashtag):
return self.get_queryset().tagged_with(hashtag=hashtag)
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class Post(StatorModel):
"""
A post (status, toot) that is either local or remote.
"""
class Visibilities(models.IntegerChoices):
public = 0
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local_only = 4
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unlisted = 1
followers = 2
mentioned = 3
# The author (attributedTo) of the post
author = models.ForeignKey(
"users.Identity",
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on_delete=models.CASCADE,
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related_name="posts",
)
# The state the post is in
state = StateField(PostStates)
# If it is our post or not
local = models.BooleanField()
# The canonical object ID
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object_uri = models.CharField(max_length=500, blank=True, null=True, unique=True)
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# Who should be able to see this Post
visibility = models.IntegerField(
choices=Visibilities.choices,
default=Visibilities.public,
)
# The main (HTML) content
content = models.TextField()
# If the contents of the post are sensitive, and the summary (content
# warning) to show if it is
sensitive = models.BooleanField(default=False)
summary = models.TextField(blank=True, null=True)
# The public, web URL of this Post on the original server
url = models.CharField(max_length=500, blank=True, null=True)
# The Post it is replying to as an AP ID URI
# (as otherwise we'd have to pull entire threads to use IDs)
in_reply_to = models.CharField(max_length=500, blank=True, null=True)
# The identities the post is directly to (who can see it if not public)
to = models.ManyToManyField(
"users.Identity",
related_name="posts_to",
blank=True,
)
# The identities mentioned in the post
mentions = models.ManyToManyField(
"users.Identity",
related_name="posts_mentioning",
blank=True,
)
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# Hashtags in the post
hashtags = models.JSONField(blank=True, null=True)
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emojis = models.ManyToManyField(
"activities.Emoji",
related_name="posts_using_emoji",
blank=True,
)
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# When the post was originally created (as opposed to when we received it)
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published = models.DateTimeField(default=timezone.now)
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# If the post has been edited after initial publication
edited = models.DateTimeField(blank=True, null=True)
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created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
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objects = PostManager()
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class Meta:
indexes = [
GinIndex(fields=["hashtags"], name="hashtags_gin"),
]
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class urls(urlman.Urls):
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view = "{self.author.urls.view}posts/{self.id}/"
object_uri = "{self.author.actor_uri}posts/{self.id}/"
action_like = "{view}like/"
action_unlike = "{view}unlike/"
action_boost = "{view}boost/"
action_unboost = "{view}unboost/"
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action_delete = "{view}delete/"
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action_edit = "{view}edit/"
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action_reply = "/compose/?reply_to={self.id}"
admin_edit = "/djadmin/activities/post/{self.id}/change/"
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def get_scheme(self, url):
return "https"
def get_hostname(self, url):
return self.instance.author.domain.uri_domain
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def __str__(self):
return f"{self.author} #{self.id}"
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def get_absolute_url(self):
return self.urls.view
def absolute_object_uri(self):
"""
Returns an object URI that is always absolute, for sending out to
other servers.
"""
if self.local:
return self.author.absolute_profile_uri() + f"posts/{self.id}/"
else:
return self.object_uri
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def in_reply_to_post(self) -> Optional["Post"]:
"""
Returns the actual Post object we're replying to, if we can find it
"""
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if self.in_reply_to is None:
return None
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return (
Post.objects.filter(object_uri=self.in_reply_to)
.select_related("author")
.first()
)
ain_reply_to_post = sync_to_async(in_reply_to_post)
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### Content cleanup and extraction ###
mention_regex = re.compile(
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r"(^|[^\w\d\-_])@([\w\d\-_]+(?:@[\w\d\-_]+\.[\w\d\-_\.]+)?)"
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)
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def linkify_mentions(self, content: str, local: bool = False) -> str:
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"""
Links mentions _in the context of the post_ - as in, using the mentions
property as the only source (as we might be doing this without other
DB access allowed)
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"""
possible_matches = {}
for mention in self.mentions.all():
if local:
url = str(mention.urls.view)
else:
url = mention.absolute_profile_uri()
possible_matches[mention.username] = url
possible_matches[f"{mention.username}@{mention.domain_id}"] = url
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collapse_name: dict[str, str] = {}
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def replacer(match):
precursor = match.group(1)
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handle = match.group(2).lower()
if "@" in handle:
short_handle = handle.split("@", 1)[0]
else:
short_handle = handle
if handle in possible_matches:
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if short_handle not in collapse_name:
collapse_name[short_handle] = handle
elif collapse_name.get(short_handle) != handle:
short_handle = handle
return f'{precursor}<a href="{possible_matches[handle]}">@{short_handle}</a>'
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else:
return match.group()
return mark_safe(self.mention_regex.sub(replacer, content))
def safe_content_local(self):
"""
Returns the content formatted for local display
"""
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return imageify_emojis(
Hashtag.linkify_hashtags(
self.linkify_mentions(sanitize_post(self.content), local=True)
),
self.author.domain,
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)
def safe_content_remote(self):
"""
Returns the content formatted for remote consumption
"""
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return self.linkify_mentions(sanitize_post(self.content))
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def safe_content_plain(self):
"""
Returns the content formatted as plain text
"""
return self.linkify_mentions(sanitize_post(self.content))
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### Async helpers ###
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async def afetch_full(self) -> "Post":
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"""
Returns a version of the object with all relations pre-loaded
"""
return (
await Post.objects.select_related("author", "author__domain")
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.prefetch_related("mentions", "mentions__domain", "attachments")
.aget(pk=self.pk)
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)
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### Local creation/editing ###
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@classmethod
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def create_local(
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cls,
author: Identity,
content: str,
summary: str | None = None,
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sensitive: bool = False,
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visibility: int = Visibilities.public,
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reply_to: Optional["Post"] = None,
attachments: list | None = None,
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) -> "Post":
with transaction.atomic():
# Find mentions in this post
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mentions = cls.mentions_from_content(content, author)
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if reply_to:
mentions.add(reply_to.author)
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# Maintain local-only for replies
if reply_to.visibility == reply_to.Visibilities.local_only:
visibility = reply_to.Visibilities.local_only
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# Find hashtags in this post
hashtags = Hashtag.hashtags_from_content(content) or None
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# Find emoji in this post
emojis = Emoji.emojis_from_content(content, author.domain)
# Strip all HTML and apply linebreaks filter
content = linebreaks_filter(strip_html(content))
# Make the Post object
post = cls.objects.create(
author=author,
content=content,
summary=summary or None,
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sensitive=bool(summary) or sensitive,
local=True,
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visibility=visibility,
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hashtags=hashtags,
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in_reply_to=reply_to.object_uri if reply_to else None,
)
post.object_uri = post.urls.object_uri
post.url = post.absolute_object_uri()
post.mentions.set(mentions)
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post.emojis.set(emojis)
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if attachments:
post.attachments.set(attachments)
post.save()
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return post
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def edit_local(
self,
content: str,
summary: str | None = None,
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visibility: int = Visibilities.public,
attachments: list | None = None,
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):
with transaction.atomic():
# Strip all HTML and apply linebreaks filter
self.content = linebreaks_filter(strip_html(content))
self.summary = summary or None
self.sensitive = bool(summary)
self.visibility = visibility
self.edited = timezone.now()
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self.hashtags = Hashtag.hashtags_from_content(content) or None
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self.mentions.set(self.mentions_from_content(content, self.author))
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self.emojis.set(Emoji.emojis_from_content(content, self.author.domain))
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self.attachments.set(attachments or [])
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self.save()
@classmethod
def mentions_from_content(cls, content, author) -> set[Identity]:
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mention_hits = cls.mention_regex.findall(content)
mentions = set()
for precursor, handle in mention_hits:
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handle = handle.lower()
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if "@" in handle:
username, domain = handle.split("@", 1)
else:
username = handle
domain = author.domain_id
identity = Identity.by_username_and_domain(
username=username,
domain=domain,
fetch=True,
)
if identity is not None:
mentions.add(identity)
return mentions
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async def ensure_hashtags(self) -> None:
"""
Ensure any of the already parsed hashtags from this Post
have a corresponding Hashtag record.
"""
# Ensure hashtags
if self.hashtags:
for hashtag in self.hashtags:
await Hashtag.objects.aget_or_create(
hashtag=hashtag,
)
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### Actions ###
def interact_as(self, identity, type):
from activities.models import PostInteraction, PostInteractionStates
interaction = PostInteraction.objects.get_or_create(
type=type, identity=identity, post=self
)[0]
if interaction.state in [
PostInteractionStates.undone,
PostInteractionStates.undone_fanned_out,
]:
interaction.transition_perform(PostInteractionStates.new)
def uninteract_as(self, identity, type):
from activities.models import PostInteraction, PostInteractionStates
for interaction in PostInteraction.objects.filter(
type=type, identity=identity, post=self
):
interaction.transition_perform(PostInteractionStates.undone)
def like_as(self, identity):
from activities.models import PostInteraction
self.interact_as(identity, PostInteraction.Types.like)
def unlike_as(self, identity):
from activities.models import PostInteraction
self.uninteract_as(identity, PostInteraction.Types.like)
def boost_as(self, identity):
from activities.models import PostInteraction
self.interact_as(identity, PostInteraction.Types.boost)
def unboost_as(self, identity):
from activities.models import PostInteraction
self.uninteract_as(identity, PostInteraction.Types.boost)
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### ActivityPub (outbound) ###
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def to_ap(self) -> dict:
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"""
Returns the AP JSON for this object
"""
value = {
"to": "as:Public",
"cc": [],
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"type": "Note",
"id": self.object_uri,
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"published": format_ld_date(self.published),
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"attributedTo": self.author.actor_uri,
"content": self.safe_content_remote(),
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"as:sensitive": self.sensitive,
"url": self.absolute_object_uri(),
"tag": [],
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"attachment": [],
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}
if self.summary:
value["summary"] = self.summary
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if self.in_reply_to:
value["inReplyTo"] = self.in_reply_to
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if self.edited:
value["updated"] = format_ld_date(self.edited)
# Mentions
for mention in self.mentions.all():
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value["tag"].append(mention.to_ap_tag())
value["cc"].append(mention.actor_uri)
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# Emoji
for emoji in self.emojis.all():
value["tag"].append(emoji.to_ap_tag())
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# Attachments
for attachment in self.attachments.all():
value["attachment"].append(attachment.to_ap())
# Remove fields if they're empty
for field in ["cc", "tag", "attachment"]:
if not value[field]:
del value[field]
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return value
def to_create_ap(self):
"""
Returns the AP JSON to create this object
"""
object = self.to_ap()
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return {
"to": object["to"],
"cc": object.get("cc", []),
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"type": "Create",
"id": self.object_uri + "#create",
"actor": self.author.actor_uri,
"object": object,
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}
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def to_update_ap(self):
"""
Returns the AP JSON to update this object
"""
object = self.to_ap()
return {
"to": object["to"],
"cc": object.get("cc", []),
"type": "Update",
"id": self.object_uri + "#update",
"actor": self.author.actor_uri,
"object": object,
}
def to_delete_ap(self):
"""
Returns the AP JSON to create this object
"""
object = self.to_ap()
return {
"to": object["to"],
"cc": object.get("cc", []),
"type": "Delete",
"id": self.object_uri + "#delete",
"actor": self.author.actor_uri,
"object": object,
}
async def aget_targets(self) -> Iterable[Identity]:
"""
Returns a list of Identities that need to see posts and their changes
"""
targets = set()
async for mention in self.mentions.all():
targets.add(mention)
# Then, if it's not mentions only, also deliver to followers
if self.visibility != Post.Visibilities.mentioned:
async for follower in self.author.inbound_follows.select_related("source"):
targets.add(follower.source)
# If it's a reply, always include the original author if we know them
reply_post = await self.ain_reply_to_post()
if reply_post:
targets.add(reply_post.author)
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# If this is a remote post or local-only, filter to only include
# local identities
if not self.local or self.visibility == Post.Visibilities.local_only:
targets = {target for target in targets if target.local}
# If it's a local post, include the author
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if self.local:
targets.add(self.author)
return targets
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### ActivityPub (inbound) ###
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@classmethod
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def by_ap(cls, data, create=False, update=False) -> "Post":
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"""
Retrieves a Post instance by its ActivityPub JSON object.
Optionally creates one if it's not present.
Raises KeyError if it's not found and create is False.
"""
# Do we have one with the right ID?
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created = False
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try:
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post = cls.objects.select_related("author__domain").get(
object_uri=data["id"]
)
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except cls.DoesNotExist:
if create:
# Resolve the author
author = Identity.by_actor_uri(data["attributedTo"], create=create)
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post = cls.objects.create(
object_uri=data["id"],
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author=author,
content=data["content"],
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local=False,
)
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created = True
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else:
raise KeyError(f"No post with ID {data['id']}", data)
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if update or created:
post.content = data["content"]
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post.summary = data.get("summary")
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post.sensitive = data.get("as:sensitive", False)
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post.url = data.get("url")
post.published = parse_ld_date(data.get("published"))
post.edited = parse_ld_date(data.get("updated"))
post.in_reply_to = data.get("inReplyTo")
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# Mentions and hashtags
post.hashtags = []
for tag in get_list(data, "tag"):
if tag["type"].lower() == "mention":
mention_identity = Identity.by_actor_uri(tag["href"], create=True)
post.mentions.add(mention_identity)
elif tag["type"].lower() == "as:hashtag":
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post.hashtags.append(tag["name"].lower().lstrip("#"))
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elif tag["type"].lower() == "http://joinmastodon.org/ns#emoji":
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emoji = Emoji.by_ap_tag(post.author.domain, tag, create=True)
post.emojis.add(emoji)
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else:
raise ValueError(f"Unknown tag type {tag['type']}")
# Visibility and to
# (a post is public if it's ever to/cc as:Public, otherwise we
# regard it as unlisted for now)
targets = get_list(data, "to") + get_list(data, "cc")
post.visibility = Post.Visibilities.unlisted
for target in targets:
if target.lower() == "as:public":
post.visibility = Post.Visibilities.public
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# Attachments
# These have no IDs, so we have to wipe them each time
post.attachments.all().delete()
for attachment in get_list(data, "attachment"):
if "http://joinmastodon.org/ns#focalPoint" in attachment:
focal_x, focal_y = attachment[
"http://joinmastodon.org/ns#focalPoint"
]["@list"]
else:
focal_x, focal_y = None, None
post.attachments.create(
remote_url=attachment["url"],
mimetype=attachment["mediaType"],
name=attachment.get("name"),
width=attachment.get("width"),
height=attachment.get("height"),
blurhash=attachment.get("http://joinmastodon.org/ns#blurhash"),
focal_x=focal_x,
focal_y=focal_y,
)
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post.save()
return post
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@classmethod
def by_object_uri(cls, object_uri, fetch=False):
"""
Gets the post by URI - either looking up locally, or fetching
from the other end if it's not here.
"""
try:
return cls.objects.get(object_uri=object_uri)
except cls.DoesNotExist:
if fetch:
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try:
response = async_to_sync(SystemActor().signed_request)(
method="get", uri=object_uri
)
except (httpx.RequestError, httpx.ConnectError):
raise cls.DoesNotExist(f"Could not fetch {object_uri}")
if response.status_code in [404, 410]:
raise cls.DoesNotExist(f"No post at {object_uri}")
if response.status_code >= 500:
raise cls.DoesNotExist(f"Server error fetching {object_uri}")
if response.status_code >= 400:
raise cls.DoesNotExist(
f"Error fetching post from {object_uri}: {response.status_code}",
{response.content},
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)
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post = cls.by_ap(
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canonicalise(response.json(), include_security=True),
create=True,
update=True,
)
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# We may need to fetch the author too
if post.author.state == IdentityStates.outdated:
async_to_sync(post.author.fetch_actor)()
return post
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else:
raise cls.DoesNotExist(f"Cannot find Post with URI {object_uri}")
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@classmethod
def handle_create_ap(cls, data):
"""
Handles an incoming create request
"""
with transaction.atomic():
# Ensure the Create actor is the Post's attributedTo
if data["actor"] != data["object"]["attributedTo"]:
raise ValueError("Create actor does not match its Post object", data)
# Create it, stator will fan it out locally
cls.by_ap(data["object"], create=True, update=True)
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@classmethod
def handle_update_ap(cls, data):
"""
Handles an incoming update request
"""
with transaction.atomic():
# Ensure the Create actor is the Post's attributedTo
if data["actor"] != data["object"]["attributedTo"]:
raise ValueError("Create actor does not match its Post object", data)
# Find it and update it
cls.by_ap(data["object"], create=False, update=True)
@classmethod
def handle_delete_ap(cls, data):
"""
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Handles an incoming delete request
"""
with transaction.atomic():
# Find our post by ID if we have one
try:
post = cls.by_object_uri(data["object"]["id"])
except cls.DoesNotExist:
# It's already been deleted
return
# Ensure the actor on the request authored the post
if not post.author.actor_uri == data["actor"]:
raise ValueError("Actor on delete does not match object")
post.delete()
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def debug_fetch(self):
"""
Fetches the Post from its original URL again and updates us with it
"""
response = httpx.get(
self.object_uri,
headers={
"Accept": "application/json",
"User-Agent": settings.TAKAHE_USER_AGENT,
},
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follow_redirects=True,
)
if 200 <= response.status_code < 300:
return self.by_ap(
canonicalise(response.json(), include_security=True),
update=True,
)
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### Mastodon API ###
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def to_mastodon_json(self, interactions=None):
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reply_parent = None
if self.in_reply_to:
reply_parent = Post.objects.filter(object_uri=self.in_reply_to).first()
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visibility_mapping = {
self.Visibilities.public: "public",
self.Visibilities.unlisted: "unlisted",
self.Visibilities.followers: "private",
self.Visibilities.mentioned: "direct",
self.Visibilities.local_only: "public",
}
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value = {
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"id": self.pk,
"uri": self.object_uri,
"created_at": format_ld_date(self.published),
"account": self.author.to_mastodon_json(),
"content": self.safe_content_remote(),
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"visibility": visibility_mapping[self.visibility],
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"sensitive": self.sensitive,
"spoiler_text": self.summary or "",
"media_attachments": [
attachment.to_mastodon_json() for attachment in self.attachments.all()
],
"mentions": [
{
"id": mention.id,
"username": mention.username,
"url": mention.absolute_profile_uri(),
"acct": mention.handle,
}
for mention in self.mentions.all()
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if mention.username
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],
"tags": (
[{"name": tag, "url": "/tag/{tag}/"} for tag in self.hashtags]
if self.hashtags
else []
),
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"emojis": [emoji.to_mastodon_json() for emoji in self.emojis.usable()],
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"reblogs_count": self.interactions.filter(type="boost").count(),
"favourites_count": self.interactions.filter(type="like").count(),
"replies_count": 0,
"url": self.absolute_object_uri(),
"in_reply_to_id": reply_parent.pk if reply_parent else None,
"in_reply_to_account_id": reply_parent.author.pk if reply_parent else None,
"reblog": None,
"poll": None,
"card": None,
"language": None,
"text": self.safe_content_plain(),
"edited_at": format_ld_date(self.edited) if self.edited else None,
}
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if interactions:
value["favourited"] = self.pk in interactions.get("like", [])
value["reblogged"] = self.pk in interactions.get("boost", [])
return value