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 activitystreams_kinds::public;
  17 use anyhow::anyhow;
  18 use lemmy_api_common::utils::blocking;
  19 use lemmy_db_schema::{
  20   newtypes::CommunityId,
  21   source::{community::Community, post::Post, site::Site},
  22   traits::Crud,
  23 };
  24 use lemmy_utils::error::LemmyError;
  25 use lemmy_websocket::LemmyContext;
  26 use url::Url;
  27
  28 /// Vote has as:Public value in cc field, unlike other activities. This indicates to other software
  29 /// (like GNU social, or presumably Mastodon), that the like actor should not be disclosed.
  30 impl Vote {
  31   pub(in crate::activities::voting) fn new(
  32     object: &PostOrComment,
  33     actor: &ApubPerson,
  34     kind: VoteType,
  35     context: &LemmyContext,
  36   ) -> Result<Vote, LemmyError> {
  37     Ok(Vote {
  38       actor: ObjectId::new(actor.actor_id()),
  39       object: ObjectId::new(object.ap_id()),
  40       cc: vec![public()],
  41       kind: kind.clone(),
  42       id: generate_activity_id(kind, &context.settings().get_protocol_and_hostname())?,
  43       unparsed: Default::default(),
  44     })
  45   }
  46
  47   #[tracing::instrument(skip_all)]
  48   pub async fn send(
  49     object: &PostOrComment,
  50     actor: &ApubPerson,
  51     community_id: CommunityId,
  52     kind: VoteType,
  53     context: &LemmyContext,
  54   ) -> Result<(), LemmyError> {
  55     let community = blocking(context.pool(), move |conn| {
  56       Community::read(conn, community_id)
  57     })
  58     .await??
  59     .into();
  60     let vote = Vote::new(object, actor, kind, context)?;
  61
  62     let activity = AnnouncableActivities::Vote(vote);
  63     send_activity_in_community(activity, actor, &community, vec![], context).await
  64   }
  65 }
  66
  67 #[async_trait::async_trait(?Send)]
  68 impl ActivityHandler for Vote {
  69   type DataType = LemmyContext;
  70   type Error = LemmyError;
  71
  72   fn id(&self) -> &Url {
  73     &self.id
  74   }
  75
  76   fn actor(&self) -> &Url {
  77     self.actor.inner()
  78   }
  79
  80   #[tracing::instrument(skip_all)]
  81   async fn verify(
  82     &self,
  83     context: &Data<LemmyContext>,
  84     request_counter: &mut i32,
  85   ) -> Result<(), LemmyError> {
  86     let community = self.get_community(context, request_counter).await?;
  87     verify_person_in_community(&self.actor, &community, context, request_counter).await?;
  88     let site = blocking(context.pool(), Site::read_local_site).await??;
  89     if self.kind == VoteType::Dislike && !site.enable_downvotes {
  90       return Err(anyhow!("Downvotes disabled").into());
  91     }
  92     Ok(())
  93   }
  94
  95   #[tracing::instrument(skip_all)]
  96   async fn receive(
  97     self,
  98     context: &Data<LemmyContext>,
  99     request_counter: &mut i32,
 100   ) -> Result<(), LemmyError> {
 101     let actor = self
 102       .actor
 103       .dereference(context, local_instance(context), request_counter)
 104       .await?;
 105     let object = self
 106       .object
 107       .dereference(context, local_instance(context), request_counter)
 108       .await?;
 109     match object {
 110       PostOrComment::Post(p) => vote_post(&self.kind, actor, &p, context).await,
 111       PostOrComment::Comment(c) => vote_comment(&self.kind, actor, &c, context).await,
 112     }
 113   }
 114 }
 115
 116 #[async_trait::async_trait(?Send)]
 117 impl GetCommunity for Vote {
 118   #[tracing::instrument(skip_all)]
 119   async fn get_community(
 120     &self,
 121     context: &LemmyContext,
 122     request_counter: &mut i32,
 123   ) -> Result<ApubCommunity, LemmyError> {
 124     let object = self
 125       .object
 126       .dereference(context, local_instance(context), request_counter)
 127       .await?;
 128     let cid = match object {
 129       PostOrComment::Post(p) => p.community_id,
 130       PostOrComment::Comment(c) => {
 131         blocking(context.pool(), move |conn| Post::read(conn, c.post_id))
 132           .await??
 133           .community_id
 134       }
 135     };
 136     let community = blocking(context.pool(), move |conn| Community::read(conn, cid)).await??;
 137     Ok(community.into())
 138   }
 139 }