from django.db import models, transaction from django.template.defaultfilters import linebreaks_filter from activities.models import FanOut, Post, PostInteraction, PostInteractionStates from core.files import resize_image from core.html import FediverseHtmlParser from stator.exceptions import TryAgainLater from users.models import ( Block, BlockStates, Domain, Follow, FollowStates, Identity, InboxMessage, User, ) class IdentityService: """ High-level helper methods for doing things to identities """ def __init__(self, identity: Identity): self.identity = identity @classmethod def create( cls, user: User, username: str, domain: Domain, name: str, discoverable: bool = True, ) -> Identity: identity = Identity.objects.create( actor_uri=f"https://{domain.uri_domain}/@{username}@{domain.domain}/", username=username, domain=domain, name=name, local=True, discoverable=discoverable, ) identity.users.add(user) identity.generate_keypair() # Send fanouts to all admin identities for admin_identity in cls.admin_identities(): FanOut.objects.create( type=FanOut.Types.identity_created, identity=admin_identity, subject_identity=identity, ) return identity @classmethod def admin_identities(cls) -> models.QuerySet[Identity]: return Identity.objects.filter(users__admin=True).distinct() def following(self) -> models.QuerySet[Identity]: return ( Identity.objects.filter( inbound_follows__source=self.identity, inbound_follows__state__in=FollowStates.group_active(), ) .not_deleted() .distinct() .order_by("username") .select_related("domain") ) def followers(self) -> models.QuerySet[Identity]: return ( Identity.objects.filter( outbound_follows__target=self.identity, outbound_follows__state=FollowStates.accepted, ) .not_deleted() .distinct() .order_by("username") .select_related("domain") ) def follow_requests(self) -> models.QuerySet[Identity]: return ( Identity.objects.filter( outbound_follows__target=self.identity, outbound_follows__state=FollowStates.pending_approval, ) .not_deleted() .distinct() .order_by("username") .select_related("domain") ) def accept_follow_request(self, source_identity): existing_follow = Follow.maybe_get(source_identity, self.identity) if existing_follow: existing_follow.transition_perform(FollowStates.accepting) def reject_follow_request(self, source_identity): existing_follow = Follow.maybe_get(source_identity, self.identity) if existing_follow: existing_follow.transition_perform(FollowStates.rejecting) def follow(self, target_identity: Identity, boosts=True) -> Follow: """ Follows a user (or does nothing if already followed). Returns the follow. """ if target_identity == self.identity: raise ValueError("You cannot follow yourself") return Follow.create_local(self.identity, target_identity, boosts=boosts) def unfollow(self, target_identity: Identity): """ Unfollows a user (or does nothing if not followed). """ if target_identity == self.identity: raise ValueError("You cannot unfollow yourself") existing_follow = Follow.maybe_get(self.identity, target_identity) if existing_follow: existing_follow.transition_perform(FollowStates.undone) InboxMessage.create_internal( { "type": "ClearTimeline", "object": target_identity.pk, "actor": self.identity.pk, } ) def block(self, target_identity: Identity) -> Block: """ Blocks a user. """ if target_identity == self.identity: raise ValueError("You cannot block yourself") self.unfollow(target_identity) self.reject_follow_request(target_identity) block = Block.create_local_block(self.identity, target_identity) InboxMessage.create_internal( { "type": "ClearTimeline", "actor": self.identity.pk, "object": target_identity.pk, "fullErase": True, } ) return block def unblock(self, target_identity: Identity): """ Unlocks a user """ if target_identity == self.identity: raise ValueError("You cannot unblock yourself") existing_block = Block.maybe_get(self.identity, target_identity, mute=False) if existing_block and existing_block.active: existing_block.transition_perform(BlockStates.undone) def mute( self, target_identity: Identity, duration: int = 0, include_notifications: bool = False, ) -> Block: """ Mutes a user. """ if target_identity == self.identity: raise ValueError("You cannot mute yourself") return Block.create_local_mute( self.identity, target_identity, duration=duration or None, include_notifications=include_notifications, ) def unmute(self, target_identity: Identity): """ Unmutes a user """ if target_identity == self.identity: raise ValueError("You cannot unmute yourself") existing_block = Block.maybe_get(self.identity, target_identity, mute=True) if existing_block and existing_block.active: existing_block.transition_perform(BlockStates.undone) def relationships(self, from_identity: Identity): """ Returns a dict of any active relationships from the given identity. """ return { "outbound_follow": Follow.maybe_get( from_identity, self.identity, require_active=True ), "inbound_follow": Follow.maybe_get( self.identity, from_identity, require_active=True ), "outbound_block": Block.maybe_get( from_identity, self.identity, mute=False, require_active=True ), "inbound_block": Block.maybe_get( self.identity, from_identity, mute=False, require_active=True ), "outbound_mute": Block.maybe_get( from_identity, self.identity, mute=True, require_active=True ), } def sync_pins(self, object_uris): if not object_uris or self.identity.domain.blocked: return with transaction.atomic(): for object_uri in object_uris: try: post = Post.by_object_uri(object_uri, fetch=True) PostInteraction.objects.get_or_create( type=PostInteraction.Types.pin, identity=self.identity, post=post, state__in=PostInteractionStates.group_active(), ) except Post.DoesNotExist: # ignore 404s... pass except TryAgainLater: # when fetching a post -> author -> post we can # get into a state. Ignore this round. pass for removed in PostInteraction.objects.filter( type=PostInteraction.Types.pin, identity=self.identity, state__in=PostInteractionStates.group_active(), ).exclude(post__object_uri__in=object_uris): removed.transition_perform(PostInteractionStates.undone_fanned_out) def mastodon_json_relationship(self, from_identity: Identity): """ Returns a Relationship object for the from_identity's relationship with this identity. """ relationships = self.relationships(from_identity) return { "id": self.identity.pk, "following": relationships["outbound_follow"] is not None and relationships["outbound_follow"].accepted, "followed_by": relationships["inbound_follow"] is not None and relationships["inbound_follow"].accepted, "showing_reblogs": ( relationships["outbound_follow"] and relationships["outbound_follow"].boosts or False ), "notifying": False, "blocking": relationships["outbound_block"] is not None, "blocked_by": relationships["inbound_block"] is not None, "muting": relationships["outbound_mute"] is not None, "muting_notifications": False, "requested": relationships["outbound_follow"] is not None and relationships["outbound_follow"].state == FollowStates.pending_approval, "domain_blocking": False, "endorsed": False, "note": ( relationships["outbound_follow"] and relationships["outbound_follow"].note or "" ), } def set_summary(self, summary: str): """ Safely sets a summary and turns linebreaks into HTML """ if summary: self.identity.summary = FediverseHtmlParser(linebreaks_filter(summary)).html else: self.identity.summary = None self.identity.save() def set_icon(self, file): """ Sets the user's avatar image """ self.identity.icon.save( file.name, resize_image(file, size=(400, 400)), ) def set_image(self, file): """ Sets the user's header image """ self.identity.image.save( file.name, resize_image(file, size=(1500, 500)), ) @classmethod def handle_internal_add_follow(cls, payload): """ Handles an inbox message saying we need to follow a handle Message format: { "type": "AddFollow", "source": "90310938129083", "target_handle": "andrew@aeracode.org", "boosts": true, } """ # Retrieve ourselves self = cls(Identity.objects.get(pk=payload["source"])) # Get the remote end (may need a fetch) username, domain = payload["target_handle"].split("@") target_identity = Identity.by_username_and_domain(username, domain, fetch=True) if target_identity is None: raise ValueError(f"Cannot find identity to follow: {target_identity}") # Follow! self.follow(target_identity=target_identity, boosts=payload.get("boosts", True))