crates/apub/src/activities/deletion/delete.rs

   1 use activitystreams::{activity::kind::DeleteType, public};
   2 use anyhow::anyhow;
   3 use url::Url;
   4
   5 use lemmy_api_common::blocking;
   6 use lemmy_apub_lib::{
   7   data::Data,
   8   traits::{ActivityHandler, ActorType},
   9 };
  10 use lemmy_db_schema::{
  11   source::{
  12     comment::Comment,
  13     community::Community,
  14     moderator::{
  15       ModRemoveComment,
  16       ModRemoveCommentForm,
  17       ModRemoveCommunity,
  18       ModRemoveCommunityForm,
  19       ModRemovePost,
  20       ModRemovePostForm,
  21     },
  22     post::Post,
  23   },
  24   traits::Crud,
  25 };
  26 use lemmy_utils::LemmyError;
  27 use lemmy_websocket::{
  28   send::{send_comment_ws_message_simple, send_community_ws_message, send_post_ws_message},
  29   LemmyContext,
  30   UserOperationCrud,
  31 };
  32
  33 use crate::{
  34   activities::{
  35     community::{announce::GetCommunity, send_to_community},
  36     deletion::{receive_delete_action, verify_delete_activity, DeletableObjects},
  37     generate_activity_id,
  38     verify_activity,
  39     verify_is_public,
  40   },
  41   activity_lists::AnnouncableActivities,
  42   fetcher::object_id::ObjectId,
  43   objects::{community::ApubCommunity, person::ApubPerson},
  44   protocol::activities::deletion::delete::Delete,
  45 };
  46
  47 #[async_trait::async_trait(?Send)]
  48 impl ActivityHandler for Delete {
  49   type DataType = LemmyContext;
  50   async fn verify(
  51     &self,
  52     context: &Data<LemmyContext>,
  53     request_counter: &mut i32,
  54   ) -> Result<(), LemmyError> {
  55     verify_is_public(&self.to)?;
  56     verify_activity(self, &context.settings())?;
  57     let community = self.get_community(context, request_counter).await?;
  58     verify_delete_activity(
  59       &self.object,
  60       self,
  61       &community,
  62       self.summary.is_some(),
  63       context,
  64       request_counter,
  65     )
  66     .await?;
  67     Ok(())
  68   }
  69
  70   async fn receive(
  71     self,
  72     context: &Data<LemmyContext>,
  73     request_counter: &mut i32,
  74   ) -> Result<(), LemmyError> {
  75     if let Some(reason) = self.summary {
  76       // We set reason to empty string if it doesn't exist, to distinguish between delete and
  77       // remove. Here we change it back to option, so we don't write it to db.
  78       let reason = if reason.is_empty() {
  79         None
  80       } else {
  81         Some(reason)
  82       };
  83       receive_remove_action(&self.actor, &self.object, reason, context, request_counter).await
  84     } else {
  85       receive_delete_action(&self.object, &self.actor, true, context, request_counter).await
  86     }
  87   }
  88 }
  89
  90 impl Delete {
  91   pub(in crate::activities::deletion) fn new(
  92     actor: &ApubPerson,
  93     community: &ApubCommunity,
  94     object_id: Url,
  95     summary: Option<String>,
  96     context: &LemmyContext,
  97   ) -> Result<Delete, LemmyError> {
  98     Ok(Delete {
  99       actor: ObjectId::new(actor.actor_id()),
 100       to: vec![public()],
 101       object: object_id,
 102       cc: vec![community.actor_id()],
 103       kind: DeleteType::Delete,
 104       summary,
 105       id: generate_activity_id(
 106         DeleteType::Delete,
 107         &context.settings().get_protocol_and_hostname(),
 108       )?,
 109       unparsed: Default::default(),
 110     })
 111   }
 112   pub(in crate::activities::deletion) async fn send(
 113     actor: &ApubPerson,
 114     community: &ApubCommunity,
 115     object_id: Url,
 116     summary: Option<String>,
 117     context: &LemmyContext,
 118   ) -> Result<(), LemmyError> {
 119     let delete = Delete::new(actor, community, object_id, summary, context)?;
 120     let delete_id = delete.id.clone();
 121
 122     let activity = AnnouncableActivities::Delete(delete);
 123     send_to_community(activity, &delete_id, actor, community, vec![], context).await
 124   }
 125 }
 126
 127 pub(in crate::activities) async fn receive_remove_action(
 128   actor: &ObjectId<ApubPerson>,
 129   object: &Url,
 130   reason: Option<String>,
 131   context: &LemmyContext,
 132   request_counter: &mut i32,
 133 ) -> Result<(), LemmyError> {
 134   let actor = actor.dereference(context, request_counter).await?;
 135   use UserOperationCrud::*;
 136   match DeletableObjects::read_from_db(object, context).await? {
 137     DeletableObjects::Community(community) => {
 138       if community.local {
 139         return Err(anyhow!("Only local admin can remove community").into());
 140       }
 141       let form = ModRemoveCommunityForm {
 142         mod_person_id: actor.id,
 143         community_id: community.id,
 144         removed: Some(true),
 145         reason,
 146         expires: None,
 147       };
 148       blocking(context.pool(), move |conn| {
 149         ModRemoveCommunity::create(conn, &form)
 150       })
 151       .await??;
 152       let deleted_community = blocking(context.pool(), move |conn| {
 153         Community::update_removed(conn, community.id, true)
 154       })
 155       .await??;
 156
 157       send_community_ws_message(deleted_community.id, RemoveCommunity, None, None, context).await?;
 158     }
 159     DeletableObjects::Post(post) => {
 160       let form = ModRemovePostForm {
 161         mod_person_id: actor.id,
 162         post_id: post.id,
 163         removed: Some(true),
 164         reason,
 165       };
 166       blocking(context.pool(), move |conn| {
 167         ModRemovePost::create(conn, &form)
 168       })
 169       .await??;
 170       let removed_post = blocking(context.pool(), move |conn| {
 171         Post::update_removed(conn, post.id, true)
 172       })
 173       .await??;
 174
 175       send_post_ws_message(removed_post.id, RemovePost, None, None, context).await?;
 176     }
 177     DeletableObjects::Comment(comment) => {
 178       let form = ModRemoveCommentForm {
 179         mod_person_id: actor.id,
 180         comment_id: comment.id,
 181         removed: Some(true),
 182         reason,
 183       };
 184       blocking(context.pool(), move |conn| {
 185         ModRemoveComment::create(conn, &form)
 186       })
 187       .await??;
 188       let removed_comment = blocking(context.pool(), move |conn| {
 189         Comment::update_removed(conn, comment.id, true)
 190       })
 191       .await??;
 192
 193       send_comment_ws_message_simple(removed_comment.id, RemoveComment, context).await?;
 194     }
 195   }
 196   Ok(())
 197 }
 198
 199 #[async_trait::async_trait(?Send)]
 200 impl GetCommunity for Delete {
 201   async fn get_community(
 202     &self,
 203     context: &LemmyContext,
 204     _request_counter: &mut i32,
 205   ) -> Result<ApubCommunity, LemmyError> {
 206     let community_id = match DeletableObjects::read_from_db(&self.object, context).await? {
 207       DeletableObjects::Community(c) => c.id,
 208       DeletableObjects::Comment(c) => {
 209         let post = blocking(context.pool(), move |conn| Post::read(conn, c.post_id)).await??;
 210         post.community_id
 211       }
 212       DeletableObjects::Post(p) => p.community_id,
 213     };
 214     let community = blocking(context.pool(), move |conn| {
 215       Community::read(conn, community_id)
 216     })
 217     .await??;
 218     Ok(community.into())
 219   }
 220 }