crates/api/src/community/transfer.rs

   1 use crate::Perform;
   2 use actix_web::web::Data;
   3 use anyhow::Context;
   4 use lemmy_api_common::{
   5   community::{GetCommunityResponse, TransferCommunity},
   6   context::LemmyContext,
   7   utils::{get_local_user_view_from_jwt, is_admin, is_top_mod},
   8 };
   9 use lemmy_db_schema::{
  10   source::{
  11     community::{CommunityModerator, CommunityModeratorForm},
  12     moderator::{ModTransferCommunity, ModTransferCommunityForm},
  13   },
  14   traits::{Crud, Joinable},
  15 };
  16 use lemmy_db_views_actor::structs::{CommunityModeratorView, CommunityView};
  17 use lemmy_utils::{error::LemmyError, location_info, ConnectionId};
  18
  19 // TODO: we dont do anything for federation here, it should be updated the next time the community
  20 //       gets fetched. i hope we can get rid of the community creator role soon.
  21 #[async_trait::async_trait(?Send)]
  22 impl Perform for TransferCommunity {
  23   type Response = GetCommunityResponse;
  24
  25   #[tracing::instrument(skip(context, _websocket_id))]
  26   async fn perform(
  27     &self,
  28     context: &Data<LemmyContext>,
  29     _websocket_id: Option<ConnectionId>,
  30   ) -> Result<GetCommunityResponse, LemmyError> {
  31     let data: &TransferCommunity = self;
  32     let local_user_view =
  33       get_local_user_view_from_jwt(&data.auth, context.pool(), context.secret()).await?;
  34
  35     // Fetch the community mods
  36     let community_id = data.community_id;
  37     let mut community_mods =
  38       CommunityModeratorView::for_community(context.pool(), community_id).await?;
  39
  40     // Make sure transferrer is either the top community mod, or an admin
  41     if !(is_top_mod(&local_user_view, &community_mods).is_ok()
  42       || is_admin(&local_user_view).is_ok())
  43     {
  44       return Err(LemmyError::from_message("not_an_admin"));
  45     }
  46
  47     // You have to re-do the community_moderator table, reordering it.
  48     // Add the transferee to the top
  49     let creator_index = community_mods
  50       .iter()
  51       .position(|r| r.moderator.id == data.person_id)
  52       .context(location_info!())?;
  53     let creator_person = community_mods.remove(creator_index);
  54     community_mods.insert(0, creator_person);
  55
  56     // Delete all the mods
  57     let community_id = data.community_id;
  58
  59     CommunityModerator::delete_for_community(context.pool(), community_id).await?;
  60
  61     // TODO: this should probably be a bulk operation
  62     // Re-add the mods, in the new order
  63     for cmod in &community_mods {
  64       let community_moderator_form = CommunityModeratorForm {
  65         community_id: cmod.community.id,
  66         person_id: cmod.moderator.id,
  67       };
  68
  69       CommunityModerator::join(context.pool(), &community_moderator_form)
  70         .await
  71         .map_err(|e| LemmyError::from_error_message(e, "community_moderator_already_exists"))?;
  72     }
  73
  74     // Mod tables
  75     let form = ModTransferCommunityForm {
  76       mod_person_id: local_user_view.person.id,
  77       other_person_id: data.person_id,
  78       community_id: data.community_id,
  79       removed: Some(false),
  80     };
  81
  82     ModTransferCommunity::create(context.pool(), &form).await?;
  83
  84     let community_id = data.community_id;
  85     let person_id = local_user_view.person.id;
  86     let community_view = CommunityView::read(context.pool(), community_id, Some(person_id), None)
  87       .await
  88       .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_community"))?;
  89
  90     let community_id = data.community_id;
  91     let moderators = CommunityModeratorView::for_community(context.pool(), community_id)
  92       .await
  93       .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_community"))?;
  94
  95     // Return the jwt
  96     Ok(GetCommunityResponse {
  97       community_view,
  98       site: None,
  99       moderators,
 100       online: 0,
 101       discussion_languages: vec![],
 102       default_post_language: None,
 103     })
 104   }
 105 }