lemmy/crates/api_crud/src/post/delete.rs

use crate::PerformCrud;
use actix_web::web::Data;
use lemmy_api_common::{
  blocking,
  check_community_ban,
  get_local_user_view_from_jwt,
  is_mod_or_admin,
  post::*,
};
use lemmy_apub::ApubObjectType;
use lemmy_db_queries::{source::post::Post_, Crud, DeleteableOrRemoveable};
use lemmy_db_schema::source::{moderator::*, post::*};
use lemmy_db_views::post_view::PostView;
use lemmy_utils::{ApiError, ConnectionId, LemmyError};
use lemmy_websocket::{messages::SendPost, LemmyContext, UserOperationCrud};

#[async_trait::async_trait(?Send)]
impl PerformCrud for DeletePost {
  type Response = PostResponse;

  async fn perform(
    &self,
    context: &Data<LemmyContext>,
    websocket_id: Option<ConnectionId>,
  ) -> Result<PostResponse, LemmyError> {
    let data: &DeletePost = self;
    let local_user_view = get_local_user_view_from_jwt(&data.auth, context.pool()).await?;

    let post_id = data.post_id;
    let orig_post = blocking(context.pool(), move |conn| Post::read(conn, post_id)).await??;

    check_community_ban(
      local_user_view.person.id,
      orig_post.community_id,
      context.pool(),
    )
    .await?;

    // Verify that only the creator can delete
    if !Post::is_post_creator(local_user_view.person.id, orig_post.creator_id) {
      return Err(ApiError::err("no_post_edit_allowed").into());
    }

    // Update the post
    let post_id = data.post_id;
    let deleted = data.deleted;
    let updated_post = blocking(context.pool(), move |conn| {
      Post::update_deleted(conn, post_id, deleted)
    })
    .await??;

    // apub updates
    if deleted {
      updated_post
        .blank_out_deleted_or_removed_info()
        .send_delete(&local_user_view.person, context)
        .await?;
    } else {
      updated_post
        .send_undo_delete(&local_user_view.person, context)
        .await?;
    }

    // Refetch the post
    let post_id = data.post_id;
    let mut post_view = blocking(context.pool(), move |conn| {
      PostView::read(conn, post_id, Some(local_user_view.person.id))
    })
    .await??;

    if deleted {
      post_view.post = post_view.post.blank_out_deleted_or_removed_info();
    }

    let res = PostResponse { post_view };

    context.chat_server().do_send(SendPost {
      op: UserOperationCrud::DeletePost,
      post: res.clone(),
      websocket_id,
    });

    Ok(res)
  }
}

#[async_trait::async_trait(?Send)]
impl PerformCrud for RemovePost {
  type Response = PostResponse;

  async fn perform(
    &self,
    context: &Data<LemmyContext>,
    websocket_id: Option<ConnectionId>,
  ) -> Result<PostResponse, LemmyError> {
    let data: &RemovePost = self;
    let local_user_view = get_local_user_view_from_jwt(&data.auth, context.pool()).await?;

    let post_id = data.post_id;
    let orig_post = blocking(context.pool(), move |conn| Post::read(conn, post_id)).await??;

    check_community_ban(
      local_user_view.person.id,
      orig_post.community_id,
      context.pool(),
    )
    .await?;

    // Verify that only the mods can remove
    is_mod_or_admin(
      context.pool(),
      local_user_view.person.id,
      orig_post.community_id,
    )
    .await?;

    // Update the post
    let post_id = data.post_id;
    let removed = data.removed;
    let updated_post = blocking(context.pool(), move |conn| {
      Post::update_removed(conn, post_id, removed)
    })
    .await??;

    // Mod tables
    let form = ModRemovePostForm {
      mod_person_id: local_user_view.person.id,
      post_id: data.post_id,
      removed: Some(removed),
      reason: data.reason.to_owned(),
    };
    blocking(context.pool(), move |conn| {
      ModRemovePost::create(conn, &form)
    })
    .await??;

    // apub updates
    if removed {
      updated_post
        .blank_out_deleted_or_removed_info()
        .send_remove(&local_user_view.person, context)
        .await?;
    } else {
      updated_post
        .send_undo_remove(&local_user_view.person, context)
        .await?;
    }

    // Refetch the post
    let post_id = data.post_id;
    let person_id = local_user_view.person.id;
    let mut post_view = blocking(context.pool(), move |conn| {
      PostView::read(conn, post_id, Some(person_id))
    })
    .await??;

    // Blank out deleted or removed info
    if removed {
      post_view.post = post_view.post.blank_out_deleted_or_removed_info();
    }

    let res = PostResponse { post_view };

    context.chat_server().do_send(SendPost {
      op: UserOperationCrud::RemovePost,
      post: res.clone(),
      websocket_id,
    });

    Ok(res)
  }
}