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   fetcher::user_or_community::UserOrCommunity,
   9   insert_received_activity,
  10   objects::{community::ApubCommunity, person::ApubPerson},
  11   protocol::activities::following::{accept::AcceptFollow, follow::Follow},
  12 };
  13 use activitypub_federation::{
  14   config::Data,
  15   kinds::activity::FollowType,
  16   protocol::verification::verify_urls_match,
  17   traits::{ActivityHandler, Actor},
  18 };
  19 use lemmy_api_common::context::LemmyContext;
  20 use lemmy_db_schema::{
  21   source::{
  22     community::{CommunityFollower, CommunityFollowerForm},
  23     person::{PersonFollower, PersonFollowerForm},
  24   },
  25   traits::Followable,
  26 };
  27 use lemmy_utils::error::LemmyError;
  28 use url::Url;
  29
  30 impl Follow {
  31   pub(in crate::activities::following) fn new(
  32     actor: &ApubPerson,
  33     community: &ApubCommunity,
  34     context: &Data<LemmyContext>,
  35   ) -> Result<Follow, LemmyError> {
  36     Ok(Follow {
  37       actor: actor.id().into(),
  38       object: community.id().into(),
  39       to: Some([community.id().into()]),
  40       kind: FollowType::Follow,
  41       id: generate_activity_id(
  42         FollowType::Follow,
  43         &context.settings().get_protocol_and_hostname(),
  44       )?,
  45     })
  46   }
  47
  48   #[tracing::instrument(skip_all)]
  49   pub async fn send(
  50     actor: &ApubPerson,
  51     community: &ApubCommunity,
  52     context: &Data<LemmyContext>,
  53   ) -> Result<(), LemmyError> {
  54     let community_follower_form = CommunityFollowerForm {
  55       community_id: community.id,
  56       person_id: actor.id,
  57       pending: true,
  58     };
  59     CommunityFollower::follow(&mut context.pool(), &community_follower_form)
  60       .await
  61       .ok();
  62
  63     let follow = Follow::new(actor, community, context)?;
  64     let inbox = vec![community.shared_inbox_or_inbox()];
  65     send_lemmy_activity(context, follow, actor, inbox, true).await
  66   }
  67 }
  68
  69 #[async_trait::async_trait]
  70 impl ActivityHandler for Follow {
  71   type DataType = LemmyContext;
  72   type Error = LemmyError;
  73
  74   fn id(&self) -> &Url {
  75     &self.id
  76   }
  77
  78   fn actor(&self) -> &Url {
  79     self.actor.inner()
  80   }
  81
  82   #[tracing::instrument(skip_all)]
  83   async fn verify(&self, context: &Data<LemmyContext>) -> Result<(), LemmyError> {
  84     insert_received_activity(&self.id, context).await?;
  85     verify_person(&self.actor, context).await?;
  86     let object = self.object.dereference(context).await?;
  87     if let UserOrCommunity::Community(c) = object {
  88       verify_person_in_community(&self.actor, &c, context).await?;
  89     }
  90     if let Some(to) = &self.to {
  91       verify_urls_match(to[0].inner(), self.object.inner())?;
  92     }
  93     Ok(())
  94   }
  95
  96   #[tracing::instrument(skip_all)]
  97   async fn receive(self, context: &Data<LemmyContext>) -> Result<(), LemmyError> {
  98     let actor = self.actor.dereference(context).await?;
  99     let object = self.object.dereference(context).await?;
 100     match object {
 101       UserOrCommunity::User(u) => {
 102         let form = PersonFollowerForm {
 103           person_id: u.id,
 104           follower_id: actor.id,
 105           pending: false,
 106         };
 107         PersonFollower::follow(&mut context.pool(), &form).await?;
 108       }
 109       UserOrCommunity::Community(c) => {
 110         let form = CommunityFollowerForm {
 111           community_id: c.id,
 112           person_id: actor.id,
 113           pending: false,
 114         };
 115         CommunityFollower::follow(&mut context.pool(), &form).await?;
 116       }
 117     }
 118
 119     AcceptFollow::send(self, context).await
 120   }
 121 }