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

use crate::PerformCrud;
use actix_web::web::Data;
use lemmy_api_common::{
  blocking,
  check_community_ban,
  check_community_deleted_or_removed,
  get_local_user_view_from_jwt,
  is_mod_or_admin,
  post::*,
};
use lemmy_apub::activities::deletion::{send_apub_delete, send_apub_remove};
use lemmy_db_schema::{
  source::{
    community::Community,
    moderator::{ModRemovePost, ModRemovePostForm},
    post::Post,
  },
  traits::Crud,
};
use lemmy_utils::{ApiError, ConnectionId, LemmyError};
use lemmy_websocket::{send::send_post_ws_message, 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(), context.secret()).await?;

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

    // Dont delete it if its already been deleted.
    if orig_post.deleted == data.deleted {
      return Err(ApiError::err_plain("couldnt_update_post").into());
    }

    check_community_ban(
      local_user_view.person.id,
      orig_post.community_id,
      context.pool(),
    )
    .await?;
    check_community_deleted_or_removed(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_plain("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
    let community = blocking(context.pool(), move |conn| {
      Community::read(conn, orig_post.community_id)
    })
    .await??;
    send_apub_delete(
      &local_user_view.person.clone().into(),
      &community.into(),
      updated_post.ap_id.into(),
      deleted,
      context,
    )
    .await?;

    send_post_ws_message(
      data.post_id,
      UserOperationCrud::DeletePost,
      websocket_id,
      Some(local_user_view.person.id),
      context,
    )
    .await
  }
}

#[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(), context.secret()).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
    let community = blocking(context.pool(), move |conn| {
      Community::read(conn, orig_post.community_id)
    })
    .await??;
    send_apub_remove(
      &local_user_view.person.clone().into(),
      &community.into(),
      updated_post.ap_id.into(),
      data.reason.clone().unwrap_or_else(|| "".to_string()),
      removed,
      context,
    )
    .await?;

    send_post_ws_message(
      data.post_id,
      UserOperationCrud::RemovePost,
      websocket_id,
      Some(local_user_view.person.id),
      context,
    )
    .await
  }
}