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

   1 use crate::{
   2   activities::{
   3     following::accept::AcceptFollowCommunity,
   4     generate_activity_id,
   5     verify_activity,
   6     verify_person,
   7   },
   8   activity_queue::send_activity_new,
   9   extensions::context::lemmy_context,
  10   fetcher::{community::get_or_fetch_and_upsert_community, person::get_or_fetch_and_upsert_person},
  11   ActorType,
  12 };
  13 use activitystreams::activity::kind::FollowType;
  14 use lemmy_api_common::blocking;
  15 use lemmy_apub_lib::{verify_urls_match, ActivityCommonFields, ActivityHandler};
  16 use lemmy_db_queries::Followable;
  17 use lemmy_db_schema::source::{
  18   community::{Community, CommunityFollower, CommunityFollowerForm},
  19   person::Person,
  20 };
  21 use lemmy_utils::LemmyError;
  22 use lemmy_websocket::LemmyContext;
  23 use url::Url;
  24
  25 #[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
  26 #[serde(rename_all = "camelCase")]
  27 pub struct FollowCommunity {
  28   pub(in crate::activities::following) to: Url,
  29   pub(in crate::activities::following) object: Url,
  30   #[serde(rename = "type")]
  31   pub(in crate::activities::following) kind: FollowType,
  32   #[serde(flatten)]
  33   pub(in crate::activities::following) common: ActivityCommonFields,
  34 }
  35
  36 impl FollowCommunity {
  37   pub async fn send(
  38     actor: &Person,
  39     community: &Community,
  40     context: &LemmyContext,
  41   ) -> Result<(), LemmyError> {
  42     let community_follower_form = CommunityFollowerForm {
  43       community_id: community.id,
  44       person_id: actor.id,
  45       pending: true,
  46     };
  47     blocking(context.pool(), move |conn| {
  48       CommunityFollower::follow(conn, &community_follower_form).ok()
  49     })
  50     .await?;
  51
  52     let id = generate_activity_id(FollowType::Follow)?;
  53     let follow = FollowCommunity {
  54       to: community.actor_id(),
  55       object: community.actor_id(),
  56       kind: FollowType::Follow,
  57       common: ActivityCommonFields {
  58         context: lemmy_context(),
  59         id: id.clone(),
  60         actor: actor.actor_id(),
  61         unparsed: Default::default(),
  62       },
  63     };
  64     let inbox = vec![community.inbox_url.clone().into()];
  65     send_activity_new(context, &follow, &id, actor, inbox, true).await
  66   }
  67 }
  68
  69 #[async_trait::async_trait(?Send)]
  70 impl ActivityHandler for FollowCommunity {
  71   async fn verify(
  72     &self,
  73     context: &LemmyContext,
  74     request_counter: &mut i32,
  75   ) -> Result<(), LemmyError> {
  76     verify_activity(self.common())?;
  77     verify_urls_match(&self.to, &self.object)?;
  78     verify_person(&self.common.actor, 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 =
  88       get_or_fetch_and_upsert_person(&self.common.actor, context, request_counter).await?;
  89     let community =
  90       get_or_fetch_and_upsert_community(&self.object, context, request_counter).await?;
  91     let community_follower_form = CommunityFollowerForm {
  92       community_id: community.id,
  93       person_id: actor.id,
  94       pending: false,
  95     };
  96
  97     // This will fail if they're already a follower, but ignore the error.
  98     blocking(context.pool(), move |conn| {
  99       CommunityFollower::follow(conn, &community_follower_form).ok()
 100     })
 101     .await?;
 102
 103     AcceptFollowCommunity::send(self, context).await
 104   }
 105
 106   fn common(&self) -> &ActivityCommonFields {
 107     &self.common
 108   }
 109 }