lemmy/crates/api/src/site/resolve_object.rs

use crate::Perform;
use actix_web::web::Data;
use diesel::NotFound;
use lemmy_api_common::{
  site::{ResolveObject, ResolveObjectResponse},
  utils::{blocking, check_private_instance, get_local_user_view_from_jwt_opt},
};
use lemmy_apub::fetcher::search::{search_by_apub_id, SearchableObjects};
use lemmy_db_schema::{newtypes::PersonId, utils::DbPool};
use lemmy_db_views::structs::{CommentView, PostView};
use lemmy_db_views_actor::structs::{CommunityView, PersonViewSafe};
use lemmy_utils::{error::LemmyError, ConnectionId};
use lemmy_websocket::LemmyContext;

#[async_trait::async_trait(?Send)]
impl Perform for ResolveObject {
  type Response = ResolveObjectResponse;

  #[tracing::instrument(skip(context, _websocket_id))]
  async fn perform(
    &self,
    context: &Data<LemmyContext>,
    _websocket_id: Option<ConnectionId>,
  ) -> Result<ResolveObjectResponse, LemmyError> {
    let local_user_view =
      get_local_user_view_from_jwt_opt(self.auth.as_ref(), context.pool(), context.secret())
        .await?;
    check_private_instance(&local_user_view, context.pool()).await?;

    let res = search_by_apub_id(&self.q, context)
      .await
      .map_err(|e| e.with_message("couldnt_find_object"))?;
    convert_response(res, local_user_view.map(|l| l.person.id), context.pool())
      .await
      .map_err(|e| e.with_message("couldnt_find_object"))
  }
}

async fn convert_response(
  object: SearchableObjects,
  user_id: Option<PersonId>,
  pool: &DbPool,
) -> Result<ResolveObjectResponse, LemmyError> {
  let removed_or_deleted;
  let mut res = ResolveObjectResponse {
    comment: None,
    post: None,
    community: None,
    person: None,
  };
  use SearchableObjects::*;
  match object {
    Person(p) => {
      removed_or_deleted = p.deleted;
      res.person = Some(blocking(pool, move |conn| PersonViewSafe::read(conn, p.id)).await??)
    }
    Community(c) => {
      removed_or_deleted = c.deleted || c.removed;
      res.community =
        Some(blocking(pool, move |conn| CommunityView::read(conn, c.id, user_id)).await??)
    }
    Post(p) => {
      removed_or_deleted = p.deleted || p.removed;
      res.post = Some(blocking(pool, move |conn| PostView::read(conn, p.id, user_id)).await??)
    }
    Comment(c) => {
      removed_or_deleted = c.deleted || c.removed;
      res.comment = Some(blocking(pool, move |conn| CommentView::read(conn, c.id, user_id)).await??)
    }
  };
  // if the object was deleted from database, dont return it
  if removed_or_deleted {
    return Err(NotFound {}.into());
  }
  Ok(res)
}