lemmy/server/src/apub/inbox/activities/create.rs

use crate::{
  api::{
    comment::{send_local_notifs, CommentResponse},
    post::PostResponse,
  },
  apub::{
    inbox::shared_inbox::{
      announce_if_community_is_local,
      get_user_from_activity,
      receive_unhandled_activity,
    },
    FromApub,
    PageExt,
  },
  blocking,
  routes::ChatServerParam,
  websocket::{
    server::{SendComment, SendPost},
    UserOperation,
  },
  DbPool,
  LemmyError,
};
use activitystreams::{activity::Create, base::AnyBase, object::Note, prelude::*};
use actix_web::{client::Client, HttpResponse};
use lemmy_db::{
  comment::{Comment, CommentForm},
  comment_view::CommentView,
  post::{Post, PostForm},
  post_view::PostView,
  Crud,
};
use lemmy_utils::scrape_text_for_mentions;

pub async fn receive_create(
  activity: AnyBase,
  client: &Client,
  pool: &DbPool,
  chat_server: ChatServerParam,
) -> Result<HttpResponse, LemmyError> {
  let create = Create::from_any_base(activity)?.unwrap();
  match create.object().as_single_kind_str() {
    Some("Page") => receive_create_post(create, client, pool, chat_server).await,
    Some("Note") => receive_create_comment(create, client, pool, chat_server).await,
    _ => receive_unhandled_activity(create),
  }
}

async fn receive_create_post(
  create: Create,
  client: &Client,
  pool: &DbPool,
  chat_server: ChatServerParam,
) -> Result<HttpResponse, LemmyError> {
  let user = get_user_from_activity(&create, client, pool).await?;
  let page = PageExt::from_any_base(create.object().to_owned().one().unwrap())?.unwrap();

  let post = PostForm::from_apub(&page, client, pool).await?;

  let inserted_post = blocking(pool, move |conn| Post::create(conn, &post)).await??;

  // Refetch the view
  let inserted_post_id = inserted_post.id;
  let post_view = blocking(pool, move |conn| {
    PostView::read(conn, inserted_post_id, None)
  })
  .await??;

  let res = PostResponse { post: post_view };

  chat_server.do_send(SendPost {
    op: UserOperation::CreatePost,
    post: res,
    my_id: None,
  });

  announce_if_community_is_local(create, &user, client, pool).await?;
  Ok(HttpResponse::Ok().finish())
}

async fn receive_create_comment(
  create: Create,
  client: &Client,
  pool: &DbPool,
  chat_server: ChatServerParam,
) -> Result<HttpResponse, LemmyError> {
  let user = get_user_from_activity(&create, client, pool).await?;
  let note = Note::from_any_base(create.object().to_owned().one().unwrap())?.unwrap();

  let comment = CommentForm::from_apub(&note, client, pool).await?;

  let inserted_comment = blocking(pool, move |conn| Comment::create(conn, &comment)).await??;

  let post_id = inserted_comment.post_id;
  let post = blocking(pool, move |conn| Post::read(conn, post_id)).await??;

  // Note:
  // Although mentions could be gotten from the post tags (they are included there), or the ccs,
  // Its much easier to scrape them from the comment body, since the API has to do that
  // anyway.
  let mentions = scrape_text_for_mentions(&inserted_comment.content);
  let recipient_ids =
    send_local_notifs(mentions, inserted_comment.clone(), &user, post, pool, true).await?;

  // Refetch the view
  let comment_view = blocking(pool, move |conn| {
    CommentView::read(conn, inserted_comment.id, None)
  })
  .await??;

  let res = CommentResponse {
    comment: comment_view,
    recipient_ids,
    form_id: None,
  };

  chat_server.do_send(SendComment {
    op: UserOperation::CreateComment,
    comment: res,
    my_id: None,
  });

  announce_if_community_is_local(create, &user, client, pool).await?;
  Ok(HttpResponse::Ok().finish())
}