lemmy_apub/src/activities/send/community.rs

   1 use crate::{
   2   activities::send::generate_activity_id,
   3   activity_queue::{send_activity_single_dest, send_to_community_followers},
   4   check_is_apub_id_valid,
   5   fetcher::get_or_fetch_and_upsert_user,
   6   ActorType,
   7 };
   8 use activitystreams::{
   9   activity::{
  10     kind::{AcceptType, AnnounceType, DeleteType, LikeType, RemoveType, UndoType},
  11     Accept,
  12     ActorAndObjectRefExt,
  13     Announce,
  14     Delete,
  15     Follow,
  16     Remove,
  17     Undo,
  18   },
  19   base::{AnyBase, BaseExt, ExtendsExt},
  20   object::ObjectExt,
  21   public,
  22 };
  23 use anyhow::Context;
  24 use itertools::Itertools;
  25 use lemmy_db::{community::Community, community_view::CommunityFollowerView, DbPool};
  26 use lemmy_structs::blocking;
  27 use lemmy_utils::{location_info, settings::Settings, LemmyError};
  28 use lemmy_websocket::LemmyContext;
  29 use url::Url;
  30
  31 #[async_trait::async_trait(?Send)]
  32 impl ActorType for Community {
  33   fn actor_id_str(&self) -> String {
  34     self.actor_id.to_owned()
  35   }
  36
  37   fn public_key(&self) -> Option<String> {
  38     self.public_key.to_owned()
  39   }
  40   fn private_key(&self) -> Option<String> {
  41     self.private_key.to_owned()
  42   }
  43
  44   async fn send_follow(
  45     &self,
  46     _follow_actor_id: &Url,
  47     _context: &LemmyContext,
  48   ) -> Result<(), LemmyError> {
  49     unimplemented!()
  50   }
  51
  52   async fn send_unfollow(
  53     &self,
  54     _follow_actor_id: &Url,
  55     _context: &LemmyContext,
  56   ) -> Result<(), LemmyError> {
  57     unimplemented!()
  58   }
  59
  60   /// As a local community, accept the follow request from a remote user.
  61   async fn send_accept_follow(
  62     &self,
  63     follow: Follow,
  64     context: &LemmyContext,
  65   ) -> Result<(), LemmyError> {
  66     let actor_uri = follow
  67       .actor()?
  68       .as_single_xsd_any_uri()
  69       .context(location_info!())?;
  70     let user = get_or_fetch_and_upsert_user(actor_uri, context, &mut 0).await?;
  71
  72     let mut accept = Accept::new(self.actor_id.to_owned(), follow.into_any_base()?);
  73     accept
  74       .set_context(activitystreams::context())
  75       .set_id(generate_activity_id(AcceptType::Accept)?)
  76       .set_to(user.actor_id()?);
  77
  78     send_activity_single_dest(accept, self, user.get_inbox_url()?, context).await?;
  79     Ok(())
  80   }
  81
  82   /// If the creator of a community deletes the community, send this to all followers.
  83   async fn send_delete(&self, context: &LemmyContext) -> Result<(), LemmyError> {
  84     let mut delete = Delete::new(self.actor_id()?, self.actor_id()?);
  85     delete
  86       .set_context(activitystreams::context())
  87       .set_id(generate_activity_id(DeleteType::Delete)?)
  88       .set_to(public())
  89       .set_many_ccs(vec![self.get_followers_url()?]);
  90
  91     send_to_community_followers(delete, self, context).await?;
  92     Ok(())
  93   }
  94
  95   /// If the creator of a community reverts the deletion of a community, send this to all followers.
  96   async fn send_undo_delete(&self, context: &LemmyContext) -> Result<(), LemmyError> {
  97     let mut delete = Delete::new(self.actor_id()?, self.actor_id()?);
  98     delete
  99       .set_context(activitystreams::context())
 100       .set_id(generate_activity_id(DeleteType::Delete)?)
 101       .set_to(public())
 102       .set_many_ccs(vec![self.get_followers_url()?]);
 103
 104     let mut undo = Undo::new(self.actor_id()?, delete.into_any_base()?);
 105     undo
 106       .set_context(activitystreams::context())
 107       .set_id(generate_activity_id(UndoType::Undo)?)
 108       .set_to(public())
 109       .set_many_ccs(vec![self.get_followers_url()?]);
 110
 111     send_to_community_followers(undo, self, context).await?;
 112     Ok(())
 113   }
 114
 115   /// If an admin removes a community, send this to all followers.
 116   async fn send_remove(&self, context: &LemmyContext) -> Result<(), LemmyError> {
 117     let mut remove = Remove::new(self.actor_id()?, self.actor_id()?);
 118     remove
 119       .set_context(activitystreams::context())
 120       .set_id(generate_activity_id(RemoveType::Remove)?)
 121       .set_to(public())
 122       .set_many_ccs(vec![self.get_followers_url()?]);
 123
 124     send_to_community_followers(remove, self, context).await?;
 125     Ok(())
 126   }
 127
 128   /// If an admin reverts the removal of a community, send this to all followers.
 129   async fn send_undo_remove(&self, context: &LemmyContext) -> Result<(), LemmyError> {
 130     let mut remove = Remove::new(self.actor_id()?, self.actor_id()?);
 131     remove
 132       .set_context(activitystreams::context())
 133       .set_id(generate_activity_id(RemoveType::Remove)?)
 134       .set_to(public())
 135       .set_many_ccs(vec![self.get_followers_url()?]);
 136
 137     // Undo that fake activity
 138     let mut undo = Undo::new(self.actor_id()?, remove.into_any_base()?);
 139     undo
 140       .set_context(activitystreams::context())
 141       .set_id(generate_activity_id(LikeType::Like)?)
 142       .set_to(public())
 143       .set_many_ccs(vec![self.get_followers_url()?]);
 144
 145     send_to_community_followers(undo, self, context).await?;
 146     Ok(())
 147   }
 148
 149   /// Wraps an activity sent to the community in an announce, and then sends the announce to all
 150   /// community followers.
 151   async fn send_announce(
 152     &self,
 153     activity: AnyBase,
 154     context: &LemmyContext,
 155   ) -> Result<(), LemmyError> {
 156     let mut announce = Announce::new(self.actor_id.to_owned(), activity);
 157     announce
 158       .set_context(activitystreams::context())
 159       .set_id(generate_activity_id(AnnounceType::Announce)?)
 160       .set_to(public())
 161       .set_many_ccs(vec![self.get_followers_url()?]);
 162
 163     send_to_community_followers(announce, self, context).await?;
 164
 165     Ok(())
 166   }
 167
 168   /// For a given community, returns the inboxes of all followers.
 169   ///
 170   /// TODO: this function is very badly implemented, we should just store shared_inbox_url in
 171   ///       CommunityFollowerView
 172   async fn get_follower_inboxes(&self, pool: &DbPool) -> Result<Vec<Url>, LemmyError> {
 173     let id = self.id;
 174
 175     let inboxes = blocking(pool, move |conn| {
 176       CommunityFollowerView::for_community(conn, id)
 177     })
 178     .await??;
 179     let inboxes = inboxes
 180       .into_iter()
 181       .filter(|i| !i.user_local)
 182       .map(|u| -> Result<Url, LemmyError> {
 183         let url = Url::parse(&u.user_actor_id)?;
 184         let domain = url.domain().context(location_info!())?;
 185         let port = if let Some(port) = url.port() {
 186           format!(":{}", port)
 187         } else {
 188           "".to_string()
 189         };
 190         Ok(Url::parse(&format!(
 191           "{}://{}{}/inbox",
 192           Settings::get().get_protocol_string(),
 193           domain,
 194           port,
 195         ))?)
 196       })
 197       .filter_map(Result::ok)
 198       // Don't send to blocked instances
 199       .filter(|inbox| check_is_apub_id_valid(inbox).is_ok())
 200       .unique()
 201       .collect();
 202
 203     Ok(inboxes)
 204   }
 205 }