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

   1 use crate::{
   2   activities::{
   3     generate_activity_id,
   4     send_lemmy_activity,
   5     verify_person,
   6     verify_person_in_community,
   7   },
   8   local_instance,
   9   objects::{community::ApubCommunity, person::ApubPerson},
  10   protocol::activities::following::{accept::AcceptFollowCommunity, follow::FollowCommunity},
  11   ActorType,
  12 };
  13 use activitypub_federation::{
  14   core::object_id::ObjectId,
  15   data::Data,
  16   traits::{ActivityHandler, Actor},
  17 };
  18 use activitystreams_kinds::activity::FollowType;
  19 use lemmy_db_schema::{
  20   source::community::{CommunityFollower, CommunityFollowerForm},
  21   traits::Followable,
  22 };
  23 use lemmy_utils::error::LemmyError;
  24 use lemmy_websocket::LemmyContext;
  25 use url::Url;
  26
  27 impl FollowCommunity {
  28   pub(in crate::activities::following) fn new(
  29     actor: &ApubPerson,
  30     community: &ApubCommunity,
  31     context: &LemmyContext,
  32   ) -> Result<FollowCommunity, LemmyError> {
  33     Ok(FollowCommunity {
  34       actor: ObjectId::new(actor.actor_id()),
  35       object: ObjectId::new(community.actor_id()),
  36       kind: FollowType::Follow,
  37       id: generate_activity_id(
  38         FollowType::Follow,
  39         &context.settings().get_protocol_and_hostname(),
  40       )?,
  41     })
  42   }
  43
  44   #[tracing::instrument(skip_all)]
  45   pub async fn send(
  46     actor: &ApubPerson,
  47     community: &ApubCommunity,
  48     context: &LemmyContext,
  49   ) -> Result<(), LemmyError> {
  50     let community_follower_form = CommunityFollowerForm {
  51       community_id: community.id,
  52       person_id: actor.id,
  53       pending: true,
  54     };
  55     CommunityFollower::follow(context.pool(), &community_follower_form)
  56       .await
  57       .ok();
  58
  59     let follow = FollowCommunity::new(actor, community, context)?;
  60     let inbox = vec![community.shared_inbox_or_inbox()];
  61     send_lemmy_activity(context, follow, actor, inbox, true).await
  62   }
  63 }
  64
  65 #[async_trait::async_trait(?Send)]
  66 impl ActivityHandler for FollowCommunity {
  67   type DataType = LemmyContext;
  68   type Error = LemmyError;
  69
  70   fn id(&self) -> &Url {
  71     &self.id
  72   }
  73
  74   fn actor(&self) -> &Url {
  75     self.actor.inner()
  76   }
  77
  78   #[tracing::instrument(skip_all)]
  79   async fn verify(
  80     &self,
  81     context: &Data<LemmyContext>,
  82     request_counter: &mut i32,
  83   ) -> Result<(), LemmyError> {
  84     verify_person(&self.actor, context, request_counter).await?;
  85     let community = self
  86       .object
  87       .dereference(context, local_instance(context).await, request_counter)
  88       .await?;
  89     verify_person_in_community(&self.actor, &community, context, request_counter).await?;
  90     Ok(())
  91   }
  92
  93   #[tracing::instrument(skip_all)]
  94   async fn receive(
  95     self,
  96     context: &Data<LemmyContext>,
  97     request_counter: &mut i32,
  98   ) -> Result<(), LemmyError> {
  99     let person = self
 100       .actor
 101       .dereference(context, local_instance(context).await, request_counter)
 102       .await?;
 103     let community = self
 104       .object
 105       .dereference(context, local_instance(context).await, request_counter)
 106       .await?;
 107     let community_follower_form = CommunityFollowerForm {
 108       community_id: community.id,
 109       person_id: person.id,
 110       pending: false,
 111     };
 112
 113     // This will fail if they're already a follower, but ignore the error.
 114     CommunityFollower::follow(context.pool(), &community_follower_form)
 115       .await
 116       .ok();
 117
 118     AcceptFollowCommunity::send(self, context, request_counter).await
 119   }
 120 }