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