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, context)?;
  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(
  59         UndoType::Undo,
  60         &context.settings().get_protocol_and_hostname(),
  61       )?,
  62       context: lemmy_context(),
  63       unparsed: Default::default(),
  64     };
  65     let inbox = vec![community.get_shared_inbox_or_inbox_url()];
  66     send_activity_new(context, &undo, &undo.id, actor, inbox, true).await
  67   }
  68 }
  69
  70 #[async_trait::async_trait(?Send)]
  71 impl ActivityHandler for UndoFollowCommunity {
  72   async fn verify(
  73     &self,
  74     context: &LemmyContext,
  75     request_counter: &mut i32,
  76   ) -> Result<(), LemmyError> {
  77     verify_activity(self, &context.settings())?;
  78     verify_urls_match(self.to.inner(), self.object.object.inner())?;
  79     verify_urls_match(self.actor(), self.object.actor())?;
  80     verify_person(&self.actor, context, request_counter).await?;
  81     self.object.verify(context, request_counter).await?;
  82     Ok(())
  83   }
  84
  85   async fn receive(
  86     self,
  87     context: &LemmyContext,
  88     request_counter: &mut i32,
  89   ) -> Result<(), LemmyError> {
  90     let actor = self.actor.dereference(context, request_counter).await?;
  91     let community = self.to.dereference(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 }