lemmy/lemmy_apub/src/activities/receive/undo_post.rs

use crate::{
  activities::receive::announce_if_community_is_local,
  fetcher::get_or_fetch_and_insert_post,
  inbox::shared_inbox::get_user_from_activity,
  ActorType,
  FromApub,
  PageExt,
};
use activitystreams::{activity::*, prelude::*};
use actix_web::HttpResponse;
use anyhow::Context;
use lemmy_db::{
  naive_now,
  post::{Post, PostForm, PostLike},
  post_view::PostView,
  Crud,
  Likeable,
};
use lemmy_structs::{blocking, post::PostResponse};
use lemmy_utils::{location_info, LemmyError};
use lemmy_websocket::{messages::SendPost, LemmyContext, UserOperation};

pub(crate) async fn receive_undo_like_post(
  undo: Undo,
  like: &Like,
  context: &LemmyContext,
) -> Result<HttpResponse, LemmyError> {
  let user = get_user_from_activity(like, context).await?;
  let page = PageExt::from_any_base(like.object().to_owned().one().context(location_info!())?)?
    .context(location_info!())?;

  let post = PostForm::from_apub(&page, context, None).await?;

  let post_id = get_or_fetch_and_insert_post(&post.get_ap_id()?, context)
    .await?
    .id;

  let user_id = user.id;
  blocking(context.pool(), move |conn| {
    PostLike::remove(conn, user_id, post_id)
  })
  .await??;

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

  let res = PostResponse { post: post_view };

  context.chat_server().do_send(SendPost {
    op: UserOperation::CreatePostLike,
    post: res,
    websocket_id: None,
  });

  announce_if_community_is_local(undo, &user, context).await?;
  Ok(HttpResponse::Ok().finish())
}

pub(crate) async fn receive_undo_dislike_post(
  undo: Undo,
  dislike: &Dislike,
  context: &LemmyContext,
) -> Result<HttpResponse, LemmyError> {
  let user = get_user_from_activity(dislike, context).await?;
  let page = PageExt::from_any_base(
    dislike
      .object()
      .to_owned()
      .one()
      .context(location_info!())?,
  )?
  .context(location_info!())?;

  let post = PostForm::from_apub(&page, context, None).await?;

  let post_id = get_or_fetch_and_insert_post(&post.get_ap_id()?, context)
    .await?
    .id;

  let user_id = user.id;
  blocking(context.pool(), move |conn| {
    PostLike::remove(conn, user_id, post_id)
  })
  .await??;

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

  let res = PostResponse { post: post_view };

  context.chat_server().do_send(SendPost {
    op: UserOperation::CreatePostLike,
    post: res,
    websocket_id: None,
  });

  announce_if_community_is_local(undo, &user, context).await?;
  Ok(HttpResponse::Ok().finish())
}

pub(crate) async fn receive_undo_delete_post(
  undo: Undo,
  delete: &Delete,
  context: &LemmyContext,
) -> Result<HttpResponse, LemmyError> {
  let user = get_user_from_activity(delete, context).await?;
  let page = PageExt::from_any_base(delete.object().to_owned().one().context(location_info!())?)?
    .context(location_info!())?;

  let post_ap_id = PostForm::from_apub(&page, context, Some(user.actor_id()?))
    .await?
    .get_ap_id()?;

  let post = get_or_fetch_and_insert_post(&post_ap_id, context).await?;

  let post_form = PostForm {
    name: post.name.to_owned(),
    url: post.url.to_owned(),
    body: post.body.to_owned(),
    creator_id: post.creator_id.to_owned(),
    community_id: post.community_id,
    removed: None,
    deleted: Some(false),
    nsfw: post.nsfw,
    locked: None,
    stickied: None,
    updated: Some(naive_now()),
    embed_title: post.embed_title,
    embed_description: post.embed_description,
    embed_html: post.embed_html,
    thumbnail_url: post.thumbnail_url,
    ap_id: Some(post.ap_id),
    local: post.local,
    published: None,
  };
  let post_id = post.id;
  blocking(context.pool(), move |conn| {
    Post::update(conn, post_id, &post_form)
  })
  .await??;

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

  let res = PostResponse { post: post_view };

  context.chat_server().do_send(SendPost {
    op: UserOperation::EditPost,
    post: res,
    websocket_id: None,
  });

  announce_if_community_is_local(undo, &user, context).await?;
  Ok(HttpResponse::Ok().finish())
}

pub(crate) async fn receive_undo_remove_post(
  undo: Undo,
  remove: &Remove,
  context: &LemmyContext,
) -> Result<HttpResponse, LemmyError> {
  let mod_ = get_user_from_activity(remove, context).await?;
  let page = PageExt::from_any_base(remove.object().to_owned().one().context(location_info!())?)?
    .context(location_info!())?;

  let post_ap_id = PostForm::from_apub(&page, context, None)
    .await?
    .get_ap_id()?;

  let post = get_or_fetch_and_insert_post(&post_ap_id, context).await?;

  let post_form = PostForm {
    name: post.name.to_owned(),
    url: post.url.to_owned(),
    body: post.body.to_owned(),
    creator_id: post.creator_id.to_owned(),
    community_id: post.community_id,
    removed: Some(false),
    deleted: None,
    nsfw: post.nsfw,
    locked: None,
    stickied: None,
    updated: Some(naive_now()),
    embed_title: post.embed_title,
    embed_description: post.embed_description,
    embed_html: post.embed_html,
    thumbnail_url: post.thumbnail_url,
    ap_id: Some(post.ap_id),
    local: post.local,
    published: None,
  };
  let post_id = post.id;
  blocking(context.pool(), move |conn| {
    Post::update(conn, post_id, &post_form)
  })
  .await??;

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

  let res = PostResponse { post: post_view };

  context.chat_server().do_send(SendPost {
    op: UserOperation::EditPost,
    post: res,
    websocket_id: None,
  });

  announce_if_community_is_local(undo, &mod_, context).await?;
  Ok(HttpResponse::Ok().finish())
}