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   public,
  22 };
  23 use anyhow::{anyhow, Context};
  24 use lemmy_api_structs::blocking;
  25 use lemmy_db_queries::{Crud, DbPool};
  26 use lemmy_db_schema::source::{
  27   comment::{Comment, CommentForm},
  28   post::Post,
  29   user::User_,
  30 };
  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     // Add a vector containing some important info to the "in_reply_to" field
  53     // [post_ap_id, Option(parent_comment_ap_id)]
  54     let mut in_reply_to_vec = vec![post.ap_id.into_inner()];
  55
  56     if let Some(parent_id) = self.parent_id {
  57       let parent_comment = blocking(pool, move |conn| Comment::read(conn, parent_id)).await??;
  58
  59       in_reply_to_vec.push(parent_comment.ap_id.into_inner());
  60     }
  61
  62     comment
  63       // Not needed when the Post is embedded in a collection (like for community outbox)
  64       .set_many_contexts(lemmy_context()?)
  65       .set_id(self.ap_id.to_owned().into_inner())
  66       .set_published(convert_datetime(self.published))
  67       .set_to(public())
  68       .set_many_in_reply_tos(in_reply_to_vec)
  69       .set_attributed_to(creator.actor_id.into_inner());
  70
  71     set_content_and_source(&mut comment, &self.content)?;
  72
  73     if let Some(u) = self.updated {
  74       comment.set_updated(convert_datetime(u));
  75     }
  76
  77     Ok(comment)
  78   }
  79
  80   fn to_tombstone(&self) -> Result<Tombstone, LemmyError> {
  81     create_tombstone(
  82       self.deleted,
  83       self.ap_id.to_owned().into(),
  84       self.updated,
  85       NoteType::Note,
  86     )
  87   }
  88 }
  89
  90 #[async_trait::async_trait(?Send)]
  91 impl FromApub for Comment {
  92   type ApubType = NoteExt;
  93
  94   /// Converts a `Note` to `Comment`.
  95   ///
  96   /// If the parent community, post and comment(s) are not known locally, these are also fetched.
  97   async fn from_apub(
  98     note: &NoteExt,
  99     context: &LemmyContext,
 100     expected_domain: Url,
 101     request_counter: &mut i32,
 102     mod_action_allowed: bool,
 103   ) -> Result<Comment, LemmyError> {
 104     let comment: Comment = get_object_from_apub(
 105       note,
 106       context,
 107       expected_domain,
 108       request_counter,
 109       mod_action_allowed,
 110     )
 111     .await?;
 112
 113     let post_id = comment.post_id;
 114     let post = blocking(context.pool(), move |conn| Post::read(conn, post_id)).await??;
 115     check_object_for_community_or_site_ban(note, post.community_id, context, request_counter)
 116       .await?;
 117     if post.locked {
 118       // This is not very efficient because a comment gets inserted just to be deleted right
 119       // afterwards, but it seems to be the easiest way to implement it.
 120       blocking(context.pool(), move |conn| {
 121         Comment::delete(conn, comment.id)
 122       })
 123       .await??;
 124       Err(anyhow!("Post is locked").into())
 125     } else {
 126       Ok(comment)
 127     }
 128   }
 129 }
 130
 131 #[async_trait::async_trait(?Send)]
 132 impl FromApubToForm<NoteExt> for CommentForm {
 133   async fn from_apub(
 134     note: &NoteExt,
 135     context: &LemmyContext,
 136     expected_domain: Url,
 137     request_counter: &mut i32,
 138     _mod_action_allowed: bool,
 139   ) -> Result<CommentForm, LemmyError> {
 140     let creator_actor_id = &note
 141       .attributed_to()
 142       .context(location_info!())?
 143       .as_single_xsd_any_uri()
 144       .context(location_info!())?;
 145
 146     let creator = get_or_fetch_and_upsert_user(creator_actor_id, context, request_counter).await?;
 147
 148     let mut in_reply_tos = note
 149       .in_reply_to()
 150       .as_ref()
 151       .context(location_info!())?
 152       .as_many()
 153       .context(location_info!())?
 154       .iter()
 155       .map(|i| i.as_xsd_any_uri().context(""));
 156     let post_ap_id = in_reply_tos.next().context(location_info!())??;
 157
 158     // This post, or the parent comment might not yet exist on this server yet, fetch them.
 159     let post = get_or_fetch_and_insert_post(&post_ap_id, context, request_counter).await?;
 160
 161     // The 2nd item, if it exists, is the parent comment apub_id
 162     // For deeply nested comments, FromApub automatically gets called recursively
 163     let parent_id: Option<i32> = match in_reply_tos.next() {
 164       Some(parent_comment_uri) => {
 165         let parent_comment_ap_id = &parent_comment_uri?;
 166         let parent_comment =
 167           get_or_fetch_and_insert_comment(&parent_comment_ap_id, context, request_counter).await?;
 168
 169         Some(parent_comment.id)
 170       }
 171       None => None,
 172     };
 173
 174     let content = get_source_markdown_value(note)?.context(location_info!())?;
 175     let content_slurs_removed = remove_slurs(&content);
 176
 177     Ok(CommentForm {
 178       creator_id: creator.id,
 179       post_id: post.id,
 180       parent_id,
 181       content: content_slurs_removed,
 182       removed: None,
 183       read: None,
 184       published: note.published().map(|u| u.to_owned().naive_local()),
 185       updated: note.updated().map(|u| u.to_owned().naive_local()),
 186       deleted: None,
 187       ap_id: Some(check_object_domain(note, expected_domain)?),
 188       local: false,
 189     })
 190   }
 191 }