326 lines
12 KiB
Python
326 lines
12 KiB
Python
import httpx
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from asgiref.sync import sync_to_async
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from django.db import models
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from activities.models.timeline_event import TimelineEvent
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from core.ld import canonicalise
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from stator.models import State, StateField, StateGraph, StatorModel
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from users.models import Block, FollowStates
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class FanOutStates(StateGraph):
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new = State(try_interval=600)
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sent = State(delete_after=86400)
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skipped = State(delete_after=86400)
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failed = State(delete_after=86400)
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new.transitions_to(sent)
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new.transitions_to(skipped)
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new.times_out_to(failed, seconds=86400 * 3)
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@classmethod
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async def handle_new(cls, instance: "FanOut"):
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"""
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Sends the fan-out to the right inbox.
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"""
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fan_out = await instance.afetch_full()
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# Don't try to fan out to identities that are not fetched yet
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if not (fan_out.identity.local or fan_out.identity.inbox_uri):
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return
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match (fan_out.type, fan_out.identity.local):
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# Handle creating/updating local posts
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case ((FanOut.Types.post | FanOut.Types.post_edited), True):
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post = await fan_out.subject_post.afetch_full()
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# If the author of the post is blocked or muted, skip out
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if (
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await Block.objects.active()
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.filter(source=fan_out.identity, target=post.author)
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.aexists()
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):
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return cls.skipped
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# Make a timeline event directly
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# If it's a reply, we only add it if we follow at least one
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# of the people mentioned AND the author, or we're mentioned,
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# or it's a reply to us or the author
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add = True
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mentioned = {identity.id for identity in post.mentions.all()}
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if post.in_reply_to:
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followed = await sync_to_async(set)(
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fan_out.identity.outbound_follows.filter(
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state__in=FollowStates.group_active()
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).values_list("target_id", flat=True)
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)
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interested_in = followed.union(
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{post.author_id, fan_out.identity_id}
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)
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add = (post.author_id in followed) and (
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bool(mentioned.intersection(interested_in))
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)
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if add:
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await sync_to_async(TimelineEvent.add_post)(
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identity=fan_out.identity,
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post=post,
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)
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# We might have been mentioned
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if (
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fan_out.identity.id in mentioned
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and fan_out.identity_id != post.author_id
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):
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await sync_to_async(TimelineEvent.add_mentioned)(
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identity=fan_out.identity,
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post=post,
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)
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# Handle sending remote posts create
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case (FanOut.Types.post, False):
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post = await fan_out.subject_post.afetch_full()
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# Sign it and send it
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try:
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await post.author.signed_request(
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method="post",
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uri=(
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fan_out.identity.shared_inbox_uri
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or fan_out.identity.inbox_uri
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),
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body=canonicalise(post.to_create_ap()),
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)
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except httpx.RequestError:
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return
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# Handle sending remote posts update
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case (FanOut.Types.post_edited, False):
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post = await fan_out.subject_post.afetch_full()
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# Sign it and send it
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try:
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await post.author.signed_request(
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method="post",
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uri=(
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fan_out.identity.shared_inbox_uri
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or fan_out.identity.inbox_uri
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),
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body=canonicalise(post.to_update_ap()),
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)
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except httpx.RequestError:
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return
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# Handle deleting local posts
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case (FanOut.Types.post_deleted, True):
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post = await fan_out.subject_post.afetch_full()
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if fan_out.identity.local:
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# Remove all timeline events mentioning it
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await TimelineEvent.objects.filter(
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identity=fan_out.identity,
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subject_post=post,
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).adelete()
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# Handle sending remote post deletes
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case (FanOut.Types.post_deleted, False):
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post = await fan_out.subject_post.afetch_full()
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# Send it to the remote inbox
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try:
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await post.author.signed_request(
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method="post",
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uri=(
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fan_out.identity.shared_inbox_uri
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or fan_out.identity.inbox_uri
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),
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body=canonicalise(post.to_delete_ap()),
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)
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except httpx.RequestError:
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return
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# Handle local boosts/likes
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case (FanOut.Types.interaction, True):
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interaction = await fan_out.subject_post_interaction.afetch_full()
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# If the author of the interaction is blocked or their notifications
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# are muted, skip out
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if (
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await Block.objects.active()
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.filter(
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models.Q(mute=False) | models.Q(include_notifications=True),
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source=fan_out.identity,
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target=interaction.identity,
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)
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.aexists()
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):
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return cls.skipped
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# If blocked/muted the underlying post author, skip out
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if (
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await Block.objects.active()
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.filter(
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source=fan_out.identity,
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target_id=interaction.post.author_id,
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)
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.aexists()
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):
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return cls.skipped
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# Make a timeline event directly
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await sync_to_async(TimelineEvent.add_post_interaction)(
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identity=fan_out.identity,
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interaction=interaction,
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)
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# Handle sending remote boosts/likes
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case (FanOut.Types.interaction, False):
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interaction = await fan_out.subject_post_interaction.afetch_full()
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# Send it to the remote inbox
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try:
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await interaction.identity.signed_request(
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method="post",
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uri=(
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fan_out.identity.shared_inbox_uri
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or fan_out.identity.inbox_uri
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),
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body=canonicalise(interaction.to_ap()),
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)
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except httpx.RequestError:
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return
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# Handle undoing local boosts/likes
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case (FanOut.Types.undo_interaction, True): # noqa:F841
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interaction = await fan_out.subject_post_interaction.afetch_full()
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# Delete any local timeline events
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await sync_to_async(TimelineEvent.delete_post_interaction)(
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identity=fan_out.identity,
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interaction=interaction,
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)
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# Handle sending remote undoing boosts/likes
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case (FanOut.Types.undo_interaction, False): # noqa:F841
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interaction = await fan_out.subject_post_interaction.afetch_full()
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# Send an undo to the remote inbox
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try:
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await interaction.identity.signed_request(
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method="post",
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uri=(
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fan_out.identity.shared_inbox_uri
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or fan_out.identity.inbox_uri
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),
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body=canonicalise(interaction.to_undo_ap()),
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)
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except httpx.RequestError:
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return
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# Handle sending identity edited to remote
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case (FanOut.Types.identity_edited, False):
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identity = await fan_out.subject_identity.afetch_full()
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try:
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await identity.signed_request(
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method="post",
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uri=(
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fan_out.identity.shared_inbox_uri
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or fan_out.identity.inbox_uri
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),
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body=canonicalise(fan_out.subject_identity.to_update_ap()),
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)
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except httpx.RequestError:
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return
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# Handle sending identity deleted to remote
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case (FanOut.Types.identity_deleted, False):
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identity = await fan_out.subject_identity.afetch_full()
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try:
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await identity.signed_request(
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method="post",
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uri=(
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fan_out.identity.shared_inbox_uri
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or fan_out.identity.inbox_uri
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),
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body=canonicalise(fan_out.subject_identity.to_delete_ap()),
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)
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except httpx.RequestError:
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return
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# Sending identity edited/deleted to local is a no-op
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case (FanOut.Types.identity_edited, True):
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pass
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case (FanOut.Types.identity_deleted, True):
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pass
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case _:
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raise ValueError(
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f"Cannot fan out with type {fan_out.type} local={fan_out.identity.local}"
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)
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return cls.sent
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class FanOut(StatorModel):
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"""
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An activity that needs to get to an inbox somewhere.
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"""
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class Types(models.TextChoices):
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post = "post"
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post_edited = "post_edited"
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post_deleted = "post_deleted"
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interaction = "interaction"
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undo_interaction = "undo_interaction"
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identity_edited = "identity_edited"
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identity_deleted = "identity_deleted"
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state = StateField(FanOutStates)
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# The user this event is targeted at
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# We always need this, but if there is a shared inbox URL on the user
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# we'll deliver to that and won't have fanouts for anyone else with the
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# same one.
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identity = models.ForeignKey(
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"users.Identity",
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on_delete=models.CASCADE,
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related_name="fan_outs",
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)
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# What type of activity it is
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type = models.CharField(max_length=100, choices=Types.choices)
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# Links to the appropriate objects
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subject_post = models.ForeignKey(
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"activities.Post",
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on_delete=models.CASCADE,
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blank=True,
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null=True,
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related_name="fan_outs",
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)
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subject_post_interaction = models.ForeignKey(
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"activities.PostInteraction",
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on_delete=models.CASCADE,
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blank=True,
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null=True,
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related_name="fan_outs",
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)
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subject_identity = models.ForeignKey(
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"users.Identity",
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on_delete=models.CASCADE,
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blank=True,
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null=True,
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related_name="subject_fan_outs",
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)
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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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### Async helpers ###
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async def afetch_full(self):
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"""
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Returns a version of the object with all relations pre-loaded
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"""
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return (
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await FanOut.objects.select_related(
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"identity",
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"subject_post",
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"subject_post_interaction",
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"subject_identity",
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"subject_identity__domain",
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)
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.prefetch_related(
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"subject_post__emojis",
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)
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.aget(pk=self.pk)
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)
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