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_activity,
   6     verify_is_public,
   7     verify_person_in_community,
   8     voting::{vote_comment, vote_post},
   9   },
  10   activity_lists::AnnouncableActivities,
  11   objects::{community::ApubCommunity, person::ApubPerson},
  12   protocol::activities::voting::vote::{Vote, VoteType},
  13   PostOrComment,
  14 };
  15 use activitystreams_kinds::public;
  16 use anyhow::anyhow;
  17 use lemmy_api_common::blocking;
  18 use lemmy_apub_lib::{
  19   data::Data,
  20   object_id::ObjectId,
  21   traits::{ActivityHandler, ActorType},
  22 };
  23 use lemmy_db_schema::{
  24   newtypes::CommunityId,
  25   source::{community::Community, post::Post, site::Site},
  26   traits::Crud,
  27 };
  28 use lemmy_utils::LemmyError;
  29 use lemmy_websocket::LemmyContext;
  30
  31 /// Vote has as:Public value in cc field, unlike other activities. This indicates to other software
  32 /// (like GNU social, or presumably Mastodon), that the like actor should not be disclosed.
  33 impl Vote {
  34   pub(in crate::activities::voting) fn new(
  35     object: &PostOrComment,
  36     actor: &ApubPerson,
  37     community: &ApubCommunity,
  38     kind: VoteType,
  39     context: &LemmyContext,
  40   ) -> Result<Vote, LemmyError> {
  41     Ok(Vote {
  42       actor: ObjectId::new(actor.actor_id()),
  43       to: vec![community.actor_id()],
  44       object: ObjectId::new(object.ap_id()),
  45       cc: vec![public()],
  46       kind: kind.clone(),
  47       id: generate_activity_id(kind, &context.settings().get_protocol_and_hostname())?,
  48       unparsed: Default::default(),
  49     })
  50   }
  51
  52   #[tracing::instrument(skip_all)]
  53   pub async fn send(
  54     object: &PostOrComment,
  55     actor: &ApubPerson,
  56     community_id: CommunityId,
  57     kind: VoteType,
  58     context: &LemmyContext,
  59   ) -> Result<(), LemmyError> {
  60     let community = blocking(context.pool(), move |conn| {
  61       Community::read(conn, community_id)
  62     })
  63     .await??
  64     .into();
  65     let vote = Vote::new(object, actor, &community, kind, context)?;
  66     let vote_id = vote.id.clone();
  67
  68     let activity = AnnouncableActivities::Vote(vote);
  69     send_activity_in_community(activity, &vote_id, actor, &community, vec![], context).await
  70   }
  71 }
  72
  73 #[async_trait::async_trait(?Send)]
  74 impl ActivityHandler for Vote {
  75   type DataType = LemmyContext;
  76
  77   #[tracing::instrument(skip_all)]
  78   async fn verify(
  79     &self,
  80     context: &Data<LemmyContext>,
  81     request_counter: &mut i32,
  82   ) -> Result<(), LemmyError> {
  83     verify_is_public(&self.to, &self.cc)?;
  84     verify_activity(&self.id, self.actor.inner(), &context.settings())?;
  85     let community = self.get_community(context, request_counter).await?;
  86     verify_person_in_community(&self.actor, &community, context, request_counter).await?;
  87     let site = blocking(context.pool(), Site::read_local_site).await??;
  88     if self.kind == VoteType::Dislike && !site.enable_downvotes {
  89       return Err(anyhow!("Downvotes disabled").into());
  90     }
  91     Ok(())
  92   }
  93
  94   #[tracing::instrument(skip_all)]
  95   async fn receive(
  96     self,
  97     context: &Data<LemmyContext>,
  98     request_counter: &mut i32,
  99   ) -> Result<(), LemmyError> {
 100     let actor = self
 101       .actor
 102       .dereference(context, context.client(), request_counter)
 103       .await?;
 104     let object = self
 105       .object
 106       .dereference(context, context.client(), request_counter)
 107       .await?;
 108     match object {
 109       PostOrComment::Post(p) => vote_post(&self.kind, actor, &p, context).await,
 110       PostOrComment::Comment(c) => vote_comment(&self.kind, actor, &c, context).await,
 111     }
 112   }
 113 }
 114
 115 #[async_trait::async_trait(?Send)]
 116 impl GetCommunity for Vote {
 117   #[tracing::instrument(skip_all)]
 118   async fn get_community(
 119     &self,
 120     context: &LemmyContext,
 121     request_counter: &mut i32,
 122   ) -> Result<ApubCommunity, LemmyError> {
 123     let object = self
 124       .object
 125       .dereference(context, context.client(), request_counter)
 126       .await?;
 127     let cid = match object {
 128       PostOrComment::Post(p) => p.community_id,
 129       PostOrComment::Comment(c) => {
 130         blocking(context.pool(), move |conn| Post::read(conn, c.post_id))
 131           .await??
 132           .community_id
 133       }
 134     };
 135     let community = blocking(context.pool(), move |conn| Community::read(conn, cid)).await??;
 136     Ok(community.into())
 137   }
 138 }