crates/apub/src/objects/comment.rs

   1 use crate::{
   2   extensions::context::lemmy_context,
   3   fetcher::objects::{get_or_fetch_and_insert_comment, get_or_fetch_and_insert_post},
   4   objects::{
   5     check_object_domain,
   6     check_object_for_community_or_site_ban,
   7     create_tombstone,
   8     get_object_from_apub,
   9     get_or_fetch_and_upsert_user,
  10     get_source_markdown_value,
  11     set_content_and_source,
  12     FromApub,
  13     FromApubToForm,
  14     ToApub,
  15   },
  16   NoteExt,
  17 };
  18 use activitystreams::{
  19   object::{kind::NoteType, ApObject, Note, Tombstone},
  20   prelude::*,
  21 };
  22 use anyhow::{anyhow, Context};
  23 use lemmy_db_queries::{Crud, DbPool};
  24 use lemmy_db_schema::source::{
  25   comment::{Comment, CommentForm},
  26   community::Community,
  27   post::Post,
  28   user::User_,
  29 };
  30 use lemmy_structs::blocking;
  31 use lemmy_utils::{
  32   location_info,
  33   utils::{convert_datetime, remove_slurs},
  34   LemmyError,
  35 };
  36 use lemmy_websocket::LemmyContext;
  37 use url::Url;
  38
  39 #[async_trait::async_trait(?Send)]
  40 impl ToApub for Comment {
  41   type ApubType = NoteExt;
  42
  43   async fn to_apub(&self, pool: &DbPool) -> Result<NoteExt, LemmyError> {
  44     let mut comment = ApObject::new(Note::new());
  45
  46     let creator_id = self.creator_id;
  47     let creator = blocking(pool, move |conn| User_::read(conn, creator_id)).await??;
  48
  49     let post_id = self.post_id;
  50     let post = blocking(pool, move |conn| Post::read(conn, post_id)).await??;
  51
  52     let community_id = post.community_id;
  53     let community = blocking(pool, move |conn| Community::read(conn, community_id)).await??;
  54
  55     // Add a vector containing some important info to the "in_reply_to" field
  56     // [post_ap_id, Option(parent_comment_ap_id)]
  57     let mut in_reply_to_vec = vec![post.ap_id];
  58
  59     if let Some(parent_id) = self.parent_id {
  60       let parent_comment = blocking(pool, move |conn| Comment::read(conn, parent_id)).await??;
  61
  62       in_reply_to_vec.push(parent_comment.ap_id);
  63     }
  64
  65     comment
  66       // Not needed when the Post is embedded in a collection (like for community outbox)
  67       .set_many_contexts(lemmy_context()?)
  68       .set_id(Url::parse(&self.ap_id)?)
  69       .set_published(convert_datetime(self.published))
  70       .set_to(community.actor_id)
  71       .set_many_in_reply_tos(in_reply_to_vec)
  72       .set_attributed_to(creator.actor_id);
  73
  74     set_content_and_source(&mut comment, &self.content)?;
  75
  76     if let Some(u) = self.updated {
  77       comment.set_updated(convert_datetime(u));
  78     }
  79
  80     Ok(comment)
  81   }
  82
  83   fn to_tombstone(&self) -> Result<Tombstone, LemmyError> {
  84     create_tombstone(self.deleted, &self.ap_id, self.updated, NoteType::Note)
  85   }
  86 }
  87
  88 #[async_trait::async_trait(?Send)]
  89 impl FromApub for Comment {
  90   type ApubType = NoteExt;
  91
  92   /// Converts a `Note` to `Comment`.
  93   ///
  94   /// If the parent community, post and comment(s) are not known locally, these are also fetched.
  95   async fn from_apub(
  96     note: &NoteExt,
  97     context: &LemmyContext,
  98     expected_domain: Url,
  99     request_counter: &mut i32,
 100   ) -> Result<Comment, LemmyError> {
 101     check_object_for_community_or_site_ban(note, context, request_counter).await?;
 102
 103     let comment: Comment =
 104       get_object_from_apub(note, context, expected_domain, request_counter).await?;
 105
 106     let post_id = comment.post_id;
 107     let post = blocking(context.pool(), move |conn| Post::read(conn, post_id)).await??;
 108     if post.locked {
 109       // This is not very efficient because a comment gets inserted just to be deleted right
 110       // afterwards, but it seems to be the easiest way to implement it.
 111       blocking(context.pool(), move |conn| {
 112         Comment::delete(conn, comment.id)
 113       })
 114       .await??;
 115       Err(anyhow!("Post is locked").into())
 116     } else {
 117       Ok(comment)
 118     }
 119   }
 120 }
 121
 122 #[async_trait::async_trait(?Send)]
 123 impl FromApubToForm<NoteExt> for CommentForm {
 124   async fn from_apub(
 125     note: &NoteExt,
 126     context: &LemmyContext,
 127     expected_domain: Url,
 128     request_counter: &mut i32,
 129   ) -> Result<CommentForm, LemmyError> {
 130     let creator_actor_id = &note
 131       .attributed_to()
 132       .context(location_info!())?
 133       .as_single_xsd_any_uri()
 134       .context(location_info!())?;
 135
 136     let creator = get_or_fetch_and_upsert_user(creator_actor_id, context, request_counter).await?;
 137
 138     let mut in_reply_tos = note
 139       .in_reply_to()
 140       .as_ref()
 141       .context(location_info!())?
 142       .as_many()
 143       .context(location_info!())?
 144       .iter()
 145       .map(|i| i.as_xsd_any_uri().context(""));
 146     let post_ap_id = in_reply_tos.next().context(location_info!())??;
 147
 148     // This post, or the parent comment might not yet exist on this server yet, fetch them.
 149     let post = get_or_fetch_and_insert_post(&post_ap_id, context, request_counter).await?;
 150
 151     // The 2nd item, if it exists, is the parent comment apub_id
 152     // For deeply nested comments, FromApub automatically gets called recursively
 153     let parent_id: Option<i32> = match in_reply_tos.next() {
 154       Some(parent_comment_uri) => {
 155         let parent_comment_ap_id = &parent_comment_uri?;
 156         let parent_comment =
 157           get_or_fetch_and_insert_comment(&parent_comment_ap_id, context, request_counter).await?;
 158
 159         Some(parent_comment.id)
 160       }
 161       None => None,
 162     };
 163
 164     let content = get_source_markdown_value(note)?.context(location_info!())?;
 165     let content_slurs_removed = remove_slurs(&content);
 166
 167     Ok(CommentForm {
 168       creator_id: creator.id,
 169       post_id: post.id,
 170       parent_id,
 171       content: content_slurs_removed,
 172       removed: None,
 173       read: None,
 174       published: note.published().map(|u| u.to_owned().naive_local()),
 175       updated: note.updated().map(|u| u.to_owned().naive_local()),
 176       deleted: None,
 177       ap_id: Some(check_object_domain(note, expected_domain)?),
 178       local: false,
 179     })
 180   }
 181 }