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

   1 use crate::{
   2   activities::{
   3     community::{
   4       announce::{AnnouncableActivities, GetCommunity},
   5       send_to_community,
   6     },
   7     generate_activity_id,
   8     verify_activity,
   9     verify_is_public,
  10     verify_person_in_community,
  11     voting::{vote_comment, vote_post},
  12   },
  13   fetcher::object_id::ObjectId,
  14   objects::{community::ApubCommunity, person::ApubPerson},
  15   PostOrComment,
  16 };
  17 use activitystreams::{public, unparsed::Unparsed};
  18 use anyhow::anyhow;
  19 use lemmy_api_common::blocking;
  20 use lemmy_apub_lib::{
  21   data::Data,
  22   traits::{ActivityFields, ActivityHandler, ActorType},
  23 };
  24 use lemmy_db_schema::{
  25   newtypes::CommunityId,
  26   source::{community::Community, post::Post},
  27   traits::Crud,
  28 };
  29 use lemmy_utils::LemmyError;
  30 use lemmy_websocket::LemmyContext;
  31 use serde::{Deserialize, Serialize};
  32 use std::{convert::TryFrom, ops::Deref};
  33 use strum_macros::ToString;
  34 use url::Url;
  35
  36 #[derive(Clone, Debug, ToString, Deserialize, Serialize)]
  37 pub enum VoteType {
  38   Like,
  39   Dislike,
  40 }
  41
  42 impl TryFrom<i16> for VoteType {
  43   type Error = LemmyError;
  44
  45   fn try_from(value: i16) -> Result<Self, Self::Error> {
  46     match value {
  47       1 => Ok(VoteType::Like),
  48       -1 => Ok(VoteType::Dislike),
  49       _ => Err(anyhow!("invalid vote value").into()),
  50     }
  51   }
  52 }
  53
  54 impl From<&VoteType> for i16 {
  55   fn from(value: &VoteType) -> i16 {
  56     match value {
  57       VoteType::Like => 1,
  58       VoteType::Dislike => -1,
  59     }
  60   }
  61 }
  62
  63 #[derive(Clone, Debug, Deserialize, Serialize, ActivityFields)]
  64 #[serde(rename_all = "camelCase")]
  65 pub struct Vote {
  66   actor: ObjectId<ApubPerson>,
  67   to: Vec<Url>,
  68   pub(in crate::activities::voting) object: ObjectId<PostOrComment>,
  69   cc: Vec<Url>,
  70   #[serde(rename = "type")]
  71   pub(in crate::activities::voting) kind: VoteType,
  72   id: Url,
  73   #[serde(flatten)]
  74   unparsed: Unparsed,
  75 }
  76
  77 impl Vote {
  78   pub(in crate::activities::voting) fn new(
  79     object: &PostOrComment,
  80     actor: &ApubPerson,
  81     community: &ApubCommunity,
  82     kind: VoteType,
  83     context: &LemmyContext,
  84   ) -> Result<Vote, LemmyError> {
  85     Ok(Vote {
  86       actor: ObjectId::new(actor.actor_id()),
  87       to: vec![public()],
  88       object: ObjectId::new(object.ap_id()),
  89       cc: vec![community.actor_id()],
  90       kind: kind.clone(),
  91       id: generate_activity_id(kind, &context.settings().get_protocol_and_hostname())?,
  92       unparsed: Default::default(),
  93     })
  94   }
  95
  96   pub async fn send(
  97     object: &PostOrComment,
  98     actor: &ApubPerson,
  99     community_id: CommunityId,
 100     kind: VoteType,
 101     context: &LemmyContext,
 102   ) -> Result<(), LemmyError> {
 103     let community = blocking(context.pool(), move |conn| {
 104       Community::read(conn, community_id)
 105     })
 106     .await??
 107     .into();
 108     let vote = Vote::new(object, actor, &community, kind, context)?;
 109     let vote_id = vote.id.clone();
 110
 111     let activity = AnnouncableActivities::Vote(vote);
 112     send_to_community(activity, &vote_id, actor, &community, vec![], context).await
 113   }
 114 }
 115
 116 #[async_trait::async_trait(?Send)]
 117 impl ActivityHandler for Vote {
 118   type DataType = LemmyContext;
 119   async fn verify(
 120     &self,
 121     context: &Data<LemmyContext>,
 122     request_counter: &mut i32,
 123   ) -> Result<(), LemmyError> {
 124     verify_is_public(&self.to)?;
 125     verify_activity(self, &context.settings())?;
 126     let community = self.get_community(context, request_counter).await?;
 127     verify_person_in_community(&self.actor, &community, context, request_counter).await?;
 128     Ok(())
 129   }
 130
 131   async fn receive(
 132     self,
 133     context: &Data<LemmyContext>,
 134     request_counter: &mut i32,
 135   ) -> Result<(), LemmyError> {
 136     let actor = self.actor.dereference(context, request_counter).await?;
 137     let object = self.object.dereference(context, request_counter).await?;
 138     match object {
 139       PostOrComment::Post(p) => vote_post(&self.kind, actor, p.deref(), context).await,
 140       PostOrComment::Comment(c) => vote_comment(&self.kind, actor, &c, context).await,
 141     }
 142   }
 143 }
 144
 145 #[async_trait::async_trait(?Send)]
 146 impl GetCommunity for Vote {
 147   async fn get_community(
 148     &self,
 149     context: &LemmyContext,
 150     request_counter: &mut i32,
 151   ) -> Result<ApubCommunity, LemmyError> {
 152     let object = self.object.dereference(context, request_counter).await?;
 153     let cid = match object {
 154       PostOrComment::Post(p) => p.community_id,
 155       PostOrComment::Comment(c) => {
 156         blocking(context.pool(), move |conn| Post::read(conn, c.post_id))
 157           .await??
 158           .community_id
 159       }
 160     };
 161     let community = blocking(context.pool(), move |conn| Community::read(conn, cid)).await??;
 162     Ok(community.into())
 163   }
 164 }