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::object_id::ObjectId,
  11   ActorType,
  12 };
  13 use activitystreams::{
  14   activity::kind::FollowType,
  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 FollowCommunity {
  34   actor: ObjectId<Person>,
  35   // TODO: is there any reason to put the same community id twice, in to and object?
  36   pub(in crate::activities::following) to: ObjectId<Community>,
  37   pub(in crate::activities::following) object: ObjectId<Community>,
  38   #[serde(rename = "type")]
  39   kind: FollowType,
  40   id: Url,
  41   #[serde(rename = "@context")]
  42   context: OneOrMany<AnyBase>,
  43   #[serde(flatten)]
  44   unparsed: Unparsed,
  45 }
  46
  47 impl FollowCommunity {
  48   pub(in crate::activities::following) fn new(
  49     actor: &Person,
  50     community: &Community,
  51   ) -> Result<FollowCommunity, LemmyError> {
  52     Ok(FollowCommunity {
  53       actor: ObjectId::new(actor.actor_id()),
  54       to: ObjectId::new(community.actor_id()),
  55       object: ObjectId::new(community.actor_id()),
  56       kind: FollowType::Follow,
  57       id: generate_activity_id(FollowType::Follow)?,
  58       context: lemmy_context(),
  59       unparsed: Default::default(),
  60     })
  61   }
  62   pub async fn send(
  63     actor: &Person,
  64     community: &Community,
  65     context: &LemmyContext,
  66   ) -> Result<(), LemmyError> {
  67     let community_follower_form = CommunityFollowerForm {
  68       community_id: community.id,
  69       person_id: actor.id,
  70       pending: true,
  71     };
  72     blocking(context.pool(), move |conn| {
  73       CommunityFollower::follow(conn, &community_follower_form).ok()
  74     })
  75     .await?;
  76
  77     let follow = FollowCommunity::new(actor, community)?;
  78     let inbox = vec![community.inbox_url.clone().into()];
  79     send_activity_new(context, &follow, &follow.id, actor, inbox, true).await
  80   }
  81 }
  82
  83 #[async_trait::async_trait(?Send)]
  84 impl ActivityHandler for FollowCommunity {
  85   async fn verify(
  86     &self,
  87     context: &LemmyContext,
  88     request_counter: &mut i32,
  89   ) -> Result<(), LemmyError> {
  90     verify_activity(self)?;
  91     verify_urls_match(self.to.inner(), self.object.inner())?;
  92     verify_person(&self.actor, context, request_counter).await?;
  93     Ok(())
  94   }
  95
  96   async fn receive(
  97     self,
  98     context: &LemmyContext,
  99     request_counter: &mut i32,
 100   ) -> Result<(), LemmyError> {
 101     let actor = self.actor.dereference(context, request_counter).await?;
 102     let community = self.object.dereference(context, request_counter).await?;
 103     let community_follower_form = CommunityFollowerForm {
 104       community_id: community.id,
 105       person_id: actor.id,
 106       pending: false,
 107     };
 108
 109     // This will fail if they're already a follower, but ignore the error.
 110     blocking(context.pool(), move |conn| {
 111       CommunityFollower::follow(conn, &community_follower_form).ok()
 112     })
 113     .await?;
 114
 115     AcceptFollowCommunity::send(self, context).await
 116   }
 117 }