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

   1 use crate::{
   2   activities::{
   3     community::announce::GetCommunity,
   4     deletion::{receive_delete_action, verify_delete_activity, DeletableObjects},
   5     generate_activity_id,
   6   },
   7   local_instance,
   8   objects::{community::ApubCommunity, person::ApubPerson},
   9   protocol::{activities::deletion::delete::Delete, IdOrNestedObject},
  10 };
  11 use activitypub_federation::{core::object_id::ObjectId, data::Data, traits::ActivityHandler};
  12 use activitystreams_kinds::activity::DeleteType;
  13 use anyhow::anyhow;
  14 use lemmy_api_common::utils::blocking;
  15 use lemmy_db_schema::{
  16   source::{
  17     comment::Comment,
  18     community::Community,
  19     moderator::{
  20       ModRemoveComment,
  21       ModRemoveCommentForm,
  22       ModRemoveCommunity,
  23       ModRemoveCommunityForm,
  24       ModRemovePost,
  25       ModRemovePostForm,
  26     },
  27     person::Person,
  28     post::Post,
  29   },
  30   traits::Crud,
  31 };
  32 use lemmy_utils::error::LemmyError;
  33 use lemmy_websocket::{
  34   send::{send_comment_ws_message_simple, send_community_ws_message, send_post_ws_message},
  35   LemmyContext,
  36   UserOperationCrud,
  37 };
  38 use url::Url;
  39
  40 #[async_trait::async_trait(?Send)]
  41 impl ActivityHandler for Delete {
  42   type DataType = LemmyContext;
  43   type Error = LemmyError;
  44
  45   fn id(&self) -> &Url {
  46     &self.id
  47   }
  48
  49   fn actor(&self) -> &Url {
  50     self.actor.inner()
  51   }
  52
  53   #[tracing::instrument(skip_all)]
  54   async fn verify(
  55     &self,
  56     context: &Data<LemmyContext>,
  57     request_counter: &mut i32,
  58   ) -> Result<(), LemmyError> {
  59     verify_delete_activity(self, self.summary.is_some(), context, request_counter).await?;
  60     Ok(())
  61   }
  62
  63   #[tracing::instrument(skip_all)]
  64   async fn receive(
  65     self,
  66     context: &Data<LemmyContext>,
  67     request_counter: &mut i32,
  68   ) -> Result<(), LemmyError> {
  69     if let Some(reason) = self.summary {
  70       // We set reason to empty string if it doesn't exist, to distinguish between delete and
  71       // remove. Here we change it back to option, so we don't write it to db.
  72       let reason = if reason.is_empty() {
  73         None
  74       } else {
  75         Some(reason)
  76       };
  77       receive_remove_action(
  78         &self
  79           .actor
  80           .dereference::<LemmyError>(context, local_instance(context), request_counter)
  81           .await?,
  82         self.object.id(),
  83         reason,
  84         context,
  85       )
  86       .await
  87     } else {
  88       receive_delete_action(
  89         self.object.id(),
  90         &self.actor,
  91         true,
  92         context,
  93         request_counter,
  94       )
  95       .await
  96     }
  97   }
  98 }
  99
 100 impl Delete {
 101   pub(in crate::activities::deletion) fn new(
 102     actor: &Person,
 103     object: DeletableObjects,
 104     to: Url,
 105     community: Option<&Community>,
 106     summary: Option<String>,
 107     context: &LemmyContext,
 108   ) -> Result<Delete, LemmyError> {
 109     let id = generate_activity_id(
 110       DeleteType::Delete,
 111       &context.settings().get_protocol_and_hostname(),
 112     )?;
 113     let cc: Option<Url> = community.map(|c| c.actor_id.clone().into());
 114     Ok(Delete {
 115       actor: ObjectId::new(actor.actor_id.clone()),
 116       to: vec![to],
 117       object: IdOrNestedObject::Id(object.id()),
 118       cc: cc.into_iter().collect(),
 119       kind: DeleteType::Delete,
 120       summary,
 121       id,
 122       unparsed: Default::default(),
 123     })
 124   }
 125 }
 126
 127 #[tracing::instrument(skip_all)]
 128 pub(in crate::activities) async fn receive_remove_action(
 129   actor: &ApubPerson,
 130   object: &Url,
 131   reason: Option<String>,
 132   context: &LemmyContext,
 133 ) -> Result<(), LemmyError> {
 134   use UserOperationCrud::*;
 135   match DeletableObjects::read_from_db(object, context).await? {
 136     DeletableObjects::Community(community) => {
 137       if community.local {
 138         return Err(LemmyError::from_message(
 139           "Only local admin can remove community",
 140         ));
 141       }
 142       let form = ModRemoveCommunityForm {
 143         mod_person_id: actor.id,
 144         community_id: community.id,
 145         removed: Some(true),
 146         reason,
 147         expires: None,
 148       };
 149       blocking(context.pool(), move |conn| {
 150         ModRemoveCommunity::create(conn, &form)
 151       })
 152       .await??;
 153       let deleted_community = blocking(context.pool(), move |conn| {
 154         Community::update_removed(conn, community.id, true)
 155       })
 156       .await??;
 157
 158       send_community_ws_message(deleted_community.id, RemoveCommunity, None, None, context).await?;
 159     }
 160     DeletableObjects::Post(post) => {
 161       let form = ModRemovePostForm {
 162         mod_person_id: actor.id,
 163         post_id: post.id,
 164         removed: Some(true),
 165         reason,
 166       };
 167       blocking(context.pool(), move |conn| {
 168         ModRemovePost::create(conn, &form)
 169       })
 170       .await??;
 171       let removed_post = blocking(context.pool(), move |conn| {
 172         Post::update_removed(conn, post.id, true)
 173       })
 174       .await??;
 175
 176       send_post_ws_message(removed_post.id, RemovePost, None, None, context).await?;
 177     }
 178     DeletableObjects::Comment(comment) => {
 179       let form = ModRemoveCommentForm {
 180         mod_person_id: actor.id,
 181         comment_id: comment.id,
 182         removed: Some(true),
 183         reason,
 184       };
 185       blocking(context.pool(), move |conn| {
 186         ModRemoveComment::create(conn, &form)
 187       })
 188       .await??;
 189       let removed_comment = blocking(context.pool(), move |conn| {
 190         Comment::update_removed(conn, comment.id, true)
 191       })
 192       .await??;
 193
 194       send_comment_ws_message_simple(removed_comment.id, RemoveComment, context).await?;
 195     }
 196     DeletableObjects::PrivateMessage(_) => unimplemented!(),
 197   }
 198   Ok(())
 199 }
 200
 201 #[async_trait::async_trait(?Send)]
 202 impl GetCommunity for Delete {
 203   #[tracing::instrument(skip_all)]
 204   async fn get_community(
 205     &self,
 206     context: &LemmyContext,
 207     _request_counter: &mut i32,
 208   ) -> Result<ApubCommunity, LemmyError> {
 209     let community_id = match DeletableObjects::read_from_db(self.object.id(), context).await? {
 210       DeletableObjects::Community(c) => c.id,
 211       DeletableObjects::Comment(c) => {
 212         let post = blocking(context.pool(), move |conn| Post::read(conn, c.post_id)).await??;
 213         post.community_id
 214       }
 215       DeletableObjects::Post(p) => p.community_id,
 216       DeletableObjects::PrivateMessage(_) => {
 217         return Err(anyhow!("Private message is not part of community").into())
 218       }
 219     };
 220     let community = blocking(context.pool(), move |conn| {
 221       Community::read(conn, community_id)
 222     })
 223     .await??;
 224     Ok(community.into())
 225   }
 226 }