crates/apub/src/activities/voting/vote.rs

   1 use crate::{
   2   activities::{
   3     community::{announce::GetCommunity, send_activity_in_community},
   4     generate_activity_id,
   5     verify_person_in_community,
   6     voting::{vote_comment, vote_post},
   7   },
   8   activity_lists::AnnouncableActivities,
   9   local_instance,
  10   objects::{community::ApubCommunity, person::ApubPerson},
  11   protocol::activities::voting::vote::{Vote, VoteType},
  12   ActorType,
  13   PostOrComment,
  14 };
  15 use activitypub_federation::{core::object_id::ObjectId, data::Data, traits::ActivityHandler};
  16 use anyhow::anyhow;
  17 use lemmy_db_schema::{
  18   newtypes::CommunityId,
  19   source::{community::Community, local_site::LocalSite, post::Post},
  20   traits::Crud,
  21 };
  22 use lemmy_utils::error::LemmyError;
  23 use lemmy_websocket::LemmyContext;
  24 use url::Url;
  25
  26 /// Vote has as:Public value in cc field, unlike other activities. This indicates to other software
  27 /// (like GNU social, or presumably Mastodon), that the like actor should not be disclosed.
  28 impl Vote {
  29   pub(in crate::activities::voting) fn new(
  30     object: &PostOrComment,
  31     actor: &ApubPerson,
  32     kind: VoteType,
  33     context: &LemmyContext,
  34   ) -> Result<Vote, LemmyError> {
  35     Ok(Vote {
  36       actor: ObjectId::new(actor.actor_id()),
  37       object: ObjectId::new(object.ap_id()),
  38       kind: kind.clone(),
  39       id: generate_activity_id(kind, &context.settings().get_protocol_and_hostname())?,
  40     })
  41   }
  42
  43   #[tracing::instrument(skip_all)]
  44   pub async fn send(
  45     object: &PostOrComment,
  46     actor: &ApubPerson,
  47     community_id: CommunityId,
  48     kind: VoteType,
  49     context: &LemmyContext,
  50   ) -> Result<(), LemmyError> {
  51     let community = Community::read(context.pool(), community_id).await?.into();
  52     let vote = Vote::new(object, actor, kind, context)?;
  53
  54     let activity = AnnouncableActivities::Vote(vote);
  55     send_activity_in_community(activity, actor, &community, vec![], false, context).await
  56   }
  57 }
  58
  59 #[async_trait::async_trait(?Send)]
  60 impl ActivityHandler for Vote {
  61   type DataType = LemmyContext;
  62   type Error = LemmyError;
  63
  64   fn id(&self) -> &Url {
  65     &self.id
  66   }
  67
  68   fn actor(&self) -> &Url {
  69     self.actor.inner()
  70   }
  71
  72   #[tracing::instrument(skip_all)]
  73   async fn verify(
  74     &self,
  75     context: &Data<LemmyContext>,
  76     request_counter: &mut i32,
  77   ) -> Result<(), LemmyError> {
  78     let community = self.get_community(context, request_counter).await?;
  79     verify_person_in_community(&self.actor, &community, context, request_counter).await?;
  80     let enable_downvotes = LocalSite::read(context.pool())
  81       .await
  82       .map(|l| l.enable_downvotes)
  83       .unwrap_or(true);
  84     if self.kind == VoteType::Dislike && !enable_downvotes {
  85       return Err(anyhow!("Downvotes disabled").into());
  86     }
  87     Ok(())
  88   }
  89
  90   #[tracing::instrument(skip_all)]
  91   async fn receive(
  92     self,
  93     context: &Data<LemmyContext>,
  94     request_counter: &mut i32,
  95   ) -> Result<(), LemmyError> {
  96     let actor = self
  97       .actor
  98       .dereference(context, local_instance(context).await, request_counter)
  99       .await?;
 100     let object = self
 101       .object
 102       .dereference(context, local_instance(context).await, request_counter)
 103       .await?;
 104     match object {
 105       PostOrComment::Post(p) => vote_post(&self.kind, actor, &p, context).await,
 106       PostOrComment::Comment(c) => vote_comment(&self.kind, actor, &c, context).await,
 107     }
 108   }
 109 }
 110
 111 #[async_trait::async_trait(?Send)]
 112 impl GetCommunity for Vote {
 113   #[tracing::instrument(skip_all)]
 114   async fn get_community(
 115     &self,
 116     context: &LemmyContext,
 117     request_counter: &mut i32,
 118   ) -> Result<ApubCommunity, LemmyError> {
 119     let object = self
 120       .object
 121       .dereference(context, local_instance(context).await, request_counter)
 122       .await?;
 123     let cid = match object {
 124       PostOrComment::Post(p) => p.community_id,
 125       PostOrComment::Comment(c) => Post::read(context.pool(), c.post_id).await?.community_id,
 126     };
 127     let community = Community::read(context.pool(), cid).await?;
 128     Ok(community.into())
 129   }
 130 }