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.into_inner()];
  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.into_inner());
  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(self.ap_id.to_owned().into_inner())
  69       .set_published(convert_datetime(self.published))
  70       .set_to(community.actor_id.into_inner())
  71       .set_many_in_reply_tos(in_reply_to_vec)
  72       .set_attributed_to(creator.actor_id.into_inner());
  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(
  85       self.deleted,
  86       self.ap_id.to_owned().into(),
  87       self.updated,
  88       NoteType::Note,
  89     )
  90   }
  91 }
  92
  93 #[async_trait::async_trait(?Send)]
  94 impl FromApub for Comment {
  95   type ApubType = NoteExt;
  96
  97   /// Converts a `Note` to `Comment`.
  98   ///
  99   /// If the parent community, post and comment(s) are not known locally, these are also fetched.
 100   async fn from_apub(
 101     note: &NoteExt,
 102     context: &LemmyContext,
 103     expected_domain: Url,
 104     request_counter: &mut i32,
 105   ) -> Result<Comment, LemmyError> {
 106     check_object_for_community_or_site_ban(note, context, request_counter).await?;
 107
 108     let comment: Comment =
 109       get_object_from_apub(note, context, expected_domain, request_counter).await?;
 110
 111     let post_id = comment.post_id;
 112     let post = blocking(context.pool(), move |conn| Post::read(conn, post_id)).await??;
 113     if post.locked {
 114       // This is not very efficient because a comment gets inserted just to be deleted right
 115       // afterwards, but it seems to be the easiest way to implement it.
 116       blocking(context.pool(), move |conn| {
 117         Comment::delete(conn, comment.id)
 118       })
 119       .await??;
 120       Err(anyhow!("Post is locked").into())
 121     } else {
 122       Ok(comment)
 123     }
 124   }
 125 }
 126
 127 #[async_trait::async_trait(?Send)]
 128 impl FromApubToForm<NoteExt> for CommentForm {
 129   async fn from_apub(
 130     note: &NoteExt,
 131     context: &LemmyContext,
 132     expected_domain: Url,
 133     request_counter: &mut i32,
 134   ) -> Result<CommentForm, LemmyError> {
 135     let creator_actor_id = &note
 136       .attributed_to()
 137       .context(location_info!())?
 138       .as_single_xsd_any_uri()
 139       .context(location_info!())?;
 140
 141     let creator = get_or_fetch_and_upsert_user(creator_actor_id, context, request_counter).await?;
 142
 143     let mut in_reply_tos = note
 144       .in_reply_to()
 145       .as_ref()
 146       .context(location_info!())?
 147       .as_many()
 148       .context(location_info!())?
 149       .iter()
 150       .map(|i| i.as_xsd_any_uri().context(""));
 151     let post_ap_id = in_reply_tos.next().context(location_info!())??;
 152
 153     // This post, or the parent comment might not yet exist on this server yet, fetch them.
 154     let post = get_or_fetch_and_insert_post(&post_ap_id, context, request_counter).await?;
 155
 156     // The 2nd item, if it exists, is the parent comment apub_id
 157     // For deeply nested comments, FromApub automatically gets called recursively
 158     let parent_id: Option<i32> = match in_reply_tos.next() {
 159       Some(parent_comment_uri) => {
 160         let parent_comment_ap_id = &parent_comment_uri?;
 161         let parent_comment =
 162           get_or_fetch_and_insert_comment(&parent_comment_ap_id, context, request_counter).await?;
 163
 164         Some(parent_comment.id)
 165       }
 166       None => None,
 167     };
 168
 169     let content = get_source_markdown_value(note)?.context(location_info!())?;
 170     let content_slurs_removed = remove_slurs(&content);
 171
 172     Ok(CommentForm {
 173       creator_id: creator.id,
 174       post_id: post.id,
 175       parent_id,
 176       content: content_slurs_removed,
 177       removed: None,
 178       read: None,
 179       published: note.published().map(|u| u.to_owned().naive_local()),
 180       updated: note.updated().map(|u| u.to_owned().naive_local()),
 181       deleted: None,
 182       ap_id: Some(check_object_domain(note, expected_domain)?),
 183       local: false,
 184     })
 185   }
 186 }