lemmy/server/src/apub/comment.rs

use super::*;

impl ToApub for Comment {
  type Response = Note;

  fn to_apub(&self, conn: &PgConnection) -> Result<Note, Error> {
    let mut comment = Note::default();
    let oprops: &mut ObjectProperties = comment.as_mut();
    let creator = User_::read(&conn, self.creator_id)?;
    let post = Post::read(&conn, self.post_id)?;
    let community = Community::read(&conn, post.community_id)?;

    // Add a vector containing some important info to the "in_reply_to" field
    // [post_ap_id, Option(parent_comment_ap_id)]
    let mut in_reply_to_vec = vec![post.ap_id];

    if let Some(parent_id) = self.parent_id {
      let parent_comment = Comment::read(&conn, parent_id)?;
      in_reply_to_vec.push(parent_comment.ap_id);
    }

    oprops
      // Not needed when the Post is embedded in a collection (like for community outbox)
      .set_context_xsd_any_uri(context())?
      .set_id(self.ap_id.to_owned())?
      // Use summary field to be consistent with mastodon content warning.
      // https://mastodon.xyz/@Louisa/103987265222901387.json
      // .set_summary_xsd_string(self.name.to_owned())?
      .set_published(convert_datetime(self.published))?
      .set_to_xsd_any_uri(community.actor_id)?
      .set_many_in_reply_to_xsd_any_uris(in_reply_to_vec)?
      .set_content_xsd_string(self.content.to_owned())?
      .set_attributed_to_xsd_any_uri(creator.actor_id)?;

    if let Some(u) = self.updated {
      oprops.set_updated(convert_datetime(u))?;
    }

    Ok(comment)
  }
}

impl FromApub for CommentForm {
  type ApubType = Note;

  /// Parse an ActivityPub note received from another instance into a Lemmy comment
  fn from_apub(note: &Note, conn: &PgConnection) -> Result<CommentForm, Error> {
    let oprops = &note.object_props;
    let creator_actor_id = &oprops.get_attributed_to_xsd_any_uri().unwrap().to_string();
    let creator = get_or_fetch_and_upsert_remote_user(&creator_actor_id, &conn)?;

    let mut in_reply_tos = oprops.get_many_in_reply_to_xsd_any_uris().unwrap();
    let post_ap_id = in_reply_tos.next().unwrap().to_string();

    // The 2nd item, if it exists, is the parent comment apub_id
    let parent_id: Option<i32> = match in_reply_tos.next() {
      Some(parent_comment_uri) => {
        let parent_comment_uri_str = &parent_comment_uri.to_string();
        let parent_comment = Comment::read_from_apub_id(&conn, &parent_comment_uri_str)?;

        Some(parent_comment.id)
      }
      None => None,
    };

    let post = Post::read_from_apub_id(&conn, &post_ap_id)?;

    Ok(CommentForm {
      creator_id: creator.id,
      post_id: post.id,
      parent_id,
      content: oprops
        .get_content_xsd_string()
        .map(|c| c.to_string())
        .unwrap(),
      removed: None,
      read: None,
      published: oprops
        .get_published()
        .map(|u| u.as_ref().to_owned().naive_local()),
      updated: oprops
        .get_updated()
        .map(|u| u.as_ref().to_owned().naive_local()),
      deleted: None,
      ap_id: oprops.get_id().unwrap().to_string(),
      local: false,
    })
  }
}

impl ApubObjectType for Comment {
  /// Send out information about a newly created comment, to the followers of the community.
  fn send_create(&self, creator: &User_, conn: &PgConnection) -> Result<(), Error> {
    let note = self.to_apub(conn)?;
    let post = Post::read(&conn, self.post_id)?;
    let community = Community::read(conn, post.community_id)?;
    let mut create = Create::new();
    populate_object_props(
      &mut create.object_props,
      &community.get_followers_url(),
      &self.ap_id,
    )?;
    create
      .create_props
      .set_actor_xsd_any_uri(creator.actor_id.to_owned())?
      .set_object_base_box(note)?;
    send_activity(
      &create,
      &creator.private_key.as_ref().unwrap(),
      &creator.actor_id,
      community.get_follower_inboxes(&conn)?,
    )?;
    Ok(())
  }

  /// Send out information about an edited post, to the followers of the community.
  fn send_update(&self, creator: &User_, conn: &PgConnection) -> Result<(), Error> {
    let note = self.to_apub(&conn)?;
    let post = Post::read(&conn, self.post_id)?;
    let community = Community::read(&conn, post.community_id)?;
    let mut update = Update::new();
    populate_object_props(
      &mut update.object_props,
      &community.get_followers_url(),
      &self.ap_id,
    )?;
    update
      .update_props
      .set_actor_xsd_any_uri(creator.actor_id.to_owned())?
      .set_object_base_box(note)?;
    send_activity(
      &update,
      &creator.private_key.as_ref().unwrap(),
      &creator.actor_id,
      community.get_follower_inboxes(&conn)?,
    )?;
    Ok(())
  }
}