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       unparsed: Default::default(),
  41     })
  42   }
  43
  44   #[tracing::instrument(skip_all)]
  45   pub async fn send(
  46     object: &PostOrComment,
  47     actor: &ApubPerson,
  48     community_id: CommunityId,
  49     kind: VoteType,
  50     context: &LemmyContext,
  51   ) -> Result<(), LemmyError> {
  52     let community = Community::read(context.pool(), community_id).await?.into();
  53     let vote = Vote::new(object, actor, kind, context)?;
  54
  55     let activity = AnnouncableActivities::Vote(vote);
  56     send_activity_in_community(activity, actor, &community, vec![], context).await
  57   }
  58 }
  59
  60 #[async_trait::async_trait(?Send)]
  61 impl ActivityHandler for Vote {
  62   type DataType = LemmyContext;
  63   type Error = LemmyError;
  64
  65   fn id(&self) -> &Url {
  66     &self.id
  67   }
  68
  69   fn actor(&self) -> &Url {
  70     self.actor.inner()
  71   }
  72
  73   #[tracing::instrument(skip_all)]
  74   async fn verify(
  75     &self,
  76     context: &Data<LemmyContext>,
  77     request_counter: &mut i32,
  78   ) -> Result<(), LemmyError> {
  79     let community = self.get_community(context, request_counter).await?;
  80     verify_person_in_community(&self.actor, &community, context, request_counter).await?;
  81     let enable_downvotes = LocalSite::read(context.pool())
  82       .await
  83       .map(|l| l.enable_downvotes)
  84       .unwrap_or(true);
  85     if self.kind == VoteType::Dislike && !enable_downvotes {
  86       return Err(anyhow!("Downvotes disabled").into());
  87     }
  88     Ok(())
  89   }
  90
  91   #[tracing::instrument(skip_all)]
  92   async fn receive(
  93     self,
  94     context: &Data<LemmyContext>,
  95     request_counter: &mut i32,
  96   ) -> Result<(), LemmyError> {
  97     let actor = self
  98       .actor
  99       .dereference(context, local_instance(context).await, request_counter)
 100       .await?;
 101     let object = self
 102       .object
 103       .dereference(context, local_instance(context).await, request_counter)
 104       .await?;
 105     match object {
 106       PostOrComment::Post(p) => vote_post(&self.kind, actor, &p, context).await,
 107       PostOrComment::Comment(c) => vote_comment(&self.kind, actor, &c, context).await,
 108     }
 109   }
 110 }
 111
 112 #[async_trait::async_trait(?Send)]
 113 impl GetCommunity for Vote {
 114   #[tracing::instrument(skip_all)]
 115   async fn get_community(
 116     &self,
 117     context: &LemmyContext,
 118     request_counter: &mut i32,
 119   ) -> Result<ApubCommunity, LemmyError> {
 120     let object = self
 121       .object
 122       .dereference(context, local_instance(context).await, request_counter)
 123       .await?;
 124     let cid = match object {
 125       PostOrComment::Post(p) => p.community_id,
 126       PostOrComment::Comment(c) => Post::read(context.pool(), c.post_id).await?.community_id,
 127     };
 128     let community = Community::read(context.pool(), cid).await?;
 129     Ok(community.into())
 130   }
 131 }