crates/apub/src/activities/following/undo.rs

   1 use crate::{
   2   activities::{
   3     following::follow::FollowCommunity,
   4     generate_activity_id,
   5     verify_activity,
   6     verify_person,
   7   },
   8   activity_queue::send_activity_new,
   9   extensions::context::lemmy_context,
  10   fetcher::{community::get_or_fetch_and_upsert_community, person::get_or_fetch_and_upsert_person},
  11   ActorType,
  12 };
  13 use activitystreams::activity::kind::{FollowType, UndoType};
  14 use lemmy_api_common::blocking;
  15 use lemmy_apub_lib::{verify_urls_match, ActivityCommonFields, ActivityHandler};
  16 use lemmy_db_queries::Followable;
  17 use lemmy_db_schema::source::{
  18   community::{Community, CommunityFollower, CommunityFollowerForm},
  19   person::Person,
  20 };
  21 use lemmy_utils::LemmyError;
  22 use lemmy_websocket::LemmyContext;
  23 use url::Url;
  24
  25 #[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
  26 #[serde(rename_all = "camelCase")]
  27 pub struct UndoFollowCommunity {
  28   to: Url,
  29   object: FollowCommunity,
  30   #[serde(rename = "type")]
  31   kind: UndoType,
  32   #[serde(flatten)]
  33   common: ActivityCommonFields,
  34 }
  35
  36 impl UndoFollowCommunity {
  37   pub async fn send(
  38     actor: &Person,
  39     community: &Community,
  40     context: &LemmyContext,
  41   ) -> Result<(), LemmyError> {
  42     let id = generate_activity_id(UndoType::Undo)?;
  43     let undo = UndoFollowCommunity {
  44       to: community.actor_id(),
  45       object: FollowCommunity {
  46         to: community.actor_id(),
  47         object: community.actor_id(),
  48         kind: FollowType::Follow,
  49         common: ActivityCommonFields {
  50           context: lemmy_context(),
  51           id: generate_activity_id(FollowType::Follow)?,
  52           actor: actor.actor_id(),
  53           unparsed: Default::default(),
  54         },
  55       },
  56       kind: UndoType::Undo,
  57       common: ActivityCommonFields {
  58         context: lemmy_context(),
  59         id: id.clone(),
  60         actor: actor.actor_id(),
  61         unparsed: Default::default(),
  62       },
  63     };
  64     let inbox = vec![community.get_shared_inbox_or_inbox_url()];
  65     send_activity_new(context, &undo, &id, actor, inbox, true).await
  66   }
  67 }
  68
  69 #[async_trait::async_trait(?Send)]
  70 impl ActivityHandler for UndoFollowCommunity {
  71   async fn verify(
  72     &self,
  73     context: &LemmyContext,
  74     request_counter: &mut i32,
  75   ) -> Result<(), LemmyError> {
  76     verify_activity(self.common())?;
  77     verify_urls_match(&self.to, &self.object.object)?;
  78     verify_urls_match(&self.common.actor, &self.object.common.actor)?;
  79     verify_person(&self.common.actor, context, request_counter).await?;
  80     self.object.verify(context, request_counter).await?;
  81     Ok(())
  82   }
  83
  84   async fn receive(
  85     self,
  86     context: &LemmyContext,
  87     request_counter: &mut i32,
  88   ) -> Result<(), LemmyError> {
  89     let actor =
  90       get_or_fetch_and_upsert_person(&self.common.actor, context, request_counter).await?;
  91     let community = get_or_fetch_and_upsert_community(&self.to, context, request_counter).await?;
  92
  93     let community_follower_form = CommunityFollowerForm {
  94       community_id: community.id,
  95       person_id: actor.id,
  96       pending: false,
  97     };
  98
  99     // This will fail if they aren't a follower, but ignore the error.
 100     blocking(context.pool(), move |conn| {
 101       CommunityFollower::unfollow(conn, &community_follower_form).ok()
 102     })
 103     .await?;
 104     Ok(())
 105   }
 106
 107   fn common(&self) -> &ActivityCommonFields {
 108     &self.common
 109   }
 110 }