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

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