crates/api/src/community.rs

   1 use crate::Perform;
   2 use actix_web::web::Data;
   3 use anyhow::Context;
   4 use lemmy_api_common::{
   5   blocking,
   6   check_community_ban,
   7   community::*,
   8   get_local_user_view_from_jwt,
   9   is_mod_or_admin,
  10 };
  11 use lemmy_apub::{ActorType, CommunityType, UserType};
  12 use lemmy_db_queries::{
  13   source::{
  14     comment::Comment_,
  15     community::{CommunityModerator_, Community_},
  16     post::Post_,
  17   },
  18   Bannable,
  19   Crud,
  20   Followable,
  21   Joinable,
  22 };
  23 use lemmy_db_schema::source::{
  24   comment::Comment,
  25   community::*,
  26   moderator::*,
  27   person::Person,
  28   post::Post,
  29   site::*,
  30 };
  31 use lemmy_db_views::comment_view::CommentQueryBuilder;
  32 use lemmy_db_views_actor::{
  33   community_moderator_view::CommunityModeratorView,
  34   community_view::CommunityView,
  35   person_view::PersonViewSafe,
  36 };
  37 use lemmy_utils::{location_info, utils::naive_from_unix, ApiError, ConnectionId, LemmyError};
  38 use lemmy_websocket::{messages::SendCommunityRoomMessage, LemmyContext, UserOperation};
  39
  40 #[async_trait::async_trait(?Send)]
  41 impl Perform for FollowCommunity {
  42   type Response = CommunityResponse;
  43
  44   async fn perform(
  45     &self,
  46     context: &Data<LemmyContext>,
  47     _websocket_id: Option<ConnectionId>,
  48   ) -> Result<CommunityResponse, LemmyError> {
  49     let data: &FollowCommunity = &self;
  50     let local_user_view = get_local_user_view_from_jwt(&data.auth, context.pool()).await?;
  51
  52     let community_id = data.community_id;
  53     let community = blocking(context.pool(), move |conn| {
  54       Community::read(conn, community_id)
  55     })
  56     .await??;
  57     let community_follower_form = CommunityFollowerForm {
  58       community_id: data.community_id,
  59       person_id: local_user_view.person.id,
  60       pending: false,
  61     };
  62
  63     if community.local {
  64       if data.follow {
  65         check_community_ban(local_user_view.person.id, community_id, context.pool()).await?;
  66
  67         let follow = move |conn: &'_ _| CommunityFollower::follow(conn, &community_follower_form);
  68         if blocking(context.pool(), follow).await?.is_err() {
  69           return Err(ApiError::err("community_follower_already_exists").into());
  70         }
  71       } else {
  72         let unfollow =
  73           move |conn: &'_ _| CommunityFollower::unfollow(conn, &community_follower_form);
  74         if blocking(context.pool(), unfollow).await?.is_err() {
  75           return Err(ApiError::err("community_follower_already_exists").into());
  76         }
  77       }
  78     } else if data.follow {
  79       // Dont actually add to the community followers here, because you need
  80       // to wait for the accept
  81       local_user_view
  82         .person
  83         .send_follow(&community.actor_id(), context)
  84         .await?;
  85     } else {
  86       local_user_view
  87         .person
  88         .send_unfollow(&community.actor_id(), context)
  89         .await?;
  90       let unfollow = move |conn: &'_ _| CommunityFollower::unfollow(conn, &community_follower_form);
  91       if blocking(context.pool(), unfollow).await?.is_err() {
  92         return Err(ApiError::err("community_follower_already_exists").into());
  93       }
  94     }
  95
  96     let community_id = data.community_id;
  97     let person_id = local_user_view.person.id;
  98     let mut community_view = blocking(context.pool(), move |conn| {
  99       CommunityView::read(conn, community_id, Some(person_id))
 100     })
 101     .await??;
 102
 103     // TODO: this needs to return a "pending" state, until Accept is received from the remote server
 104     // For now, just assume that remote follows are accepted.
 105     // Otherwise, the subscribed will be null
 106     if !community.local {
 107       community_view.subscribed = data.follow;
 108     }
 109
 110     Ok(CommunityResponse { community_view })
 111   }
 112 }
 113
 114 #[async_trait::async_trait(?Send)]
 115 impl Perform for BanFromCommunity {
 116   type Response = BanFromCommunityResponse;
 117
 118   async fn perform(
 119     &self,
 120     context: &Data<LemmyContext>,
 121     websocket_id: Option<ConnectionId>,
 122   ) -> Result<BanFromCommunityResponse, LemmyError> {
 123     let data: &BanFromCommunity = &self;
 124     let local_user_view = get_local_user_view_from_jwt(&data.auth, context.pool()).await?;
 125
 126     let community_id = data.community_id;
 127     let banned_person_id = data.person_id;
 128
 129     // Verify that only mods or admins can ban
 130     is_mod_or_admin(context.pool(), local_user_view.person.id, community_id).await?;
 131
 132     let community_user_ban_form = CommunityPersonBanForm {
 133       community_id: data.community_id,
 134       person_id: data.person_id,
 135     };
 136
 137     if data.ban {
 138       let ban = move |conn: &'_ _| CommunityPersonBan::ban(conn, &community_user_ban_form);
 139       if blocking(context.pool(), ban).await?.is_err() {
 140         return Err(ApiError::err("community_user_already_banned").into());
 141       }
 142
 143       // Also unsubscribe them from the community, if they are subscribed
 144       let community_follower_form = CommunityFollowerForm {
 145         community_id: data.community_id,
 146         person_id: banned_person_id,
 147         pending: false,
 148       };
 149       blocking(context.pool(), move |conn: &'_ _| {
 150         CommunityFollower::unfollow(conn, &community_follower_form)
 151       })
 152       .await?
 153       .ok();
 154     } else {
 155       let unban = move |conn: &'_ _| CommunityPersonBan::unban(conn, &community_user_ban_form);
 156       if blocking(context.pool(), unban).await?.is_err() {
 157         return Err(ApiError::err("community_user_already_banned").into());
 158       }
 159     }
 160
 161     // Remove/Restore their data if that's desired
 162     if data.remove_data {
 163       // Posts
 164       blocking(context.pool(), move |conn: &'_ _| {
 165         Post::update_removed_for_creator(conn, banned_person_id, Some(community_id), true)
 166       })
 167       .await??;
 168
 169       // Comments
 170       // TODO Diesel doesn't allow updates with joins, so this has to be a loop
 171       let comments = blocking(context.pool(), move |conn| {
 172         CommentQueryBuilder::create(conn)
 173           .creator_id(banned_person_id)
 174           .community_id(community_id)
 175           .limit(std::i64::MAX)
 176           .list()
 177       })
 178       .await??;
 179
 180       for comment_view in &comments {
 181         let comment_id = comment_view.comment.id;
 182         blocking(context.pool(), move |conn: &'_ _| {
 183           Comment::update_removed(conn, comment_id, true)
 184         })
 185         .await??;
 186       }
 187     }
 188
 189     // Mod tables
 190     // TODO eventually do correct expires
 191     let expires = data.expires.map(naive_from_unix);
 192
 193     let form = ModBanFromCommunityForm {
 194       mod_person_id: local_user_view.person.id,
 195       other_person_id: data.person_id,
 196       community_id: data.community_id,
 197       reason: data.reason.to_owned(),
 198       banned: Some(data.ban),
 199       expires,
 200     };
 201     blocking(context.pool(), move |conn| {
 202       ModBanFromCommunity::create(conn, &form)
 203     })
 204     .await??;
 205
 206     let person_id = data.person_id;
 207     let person_view = blocking(context.pool(), move |conn| {
 208       PersonViewSafe::read(conn, person_id)
 209     })
 210     .await??;
 211
 212     let res = BanFromCommunityResponse {
 213       person_view,
 214       banned: data.ban,
 215     };
 216
 217     context.chat_server().do_send(SendCommunityRoomMessage {
 218       op: UserOperation::BanFromCommunity,
 219       response: res.clone(),
 220       community_id,
 221       websocket_id,
 222     });
 223
 224     Ok(res)
 225   }
 226 }
 227
 228 #[async_trait::async_trait(?Send)]
 229 impl Perform for AddModToCommunity {
 230   type Response = AddModToCommunityResponse;
 231
 232   async fn perform(
 233     &self,
 234     context: &Data<LemmyContext>,
 235     websocket_id: Option<ConnectionId>,
 236   ) -> Result<AddModToCommunityResponse, LemmyError> {
 237     let data: &AddModToCommunity = &self;
 238     let local_user_view = get_local_user_view_from_jwt(&data.auth, context.pool()).await?;
 239
 240     let community_id = data.community_id;
 241
 242     // Verify that only mods or admins can add mod
 243     is_mod_or_admin(context.pool(), local_user_view.person.id, community_id).await?;
 244
 245     // Update in local database
 246     let community_moderator_form = CommunityModeratorForm {
 247       community_id: data.community_id,
 248       person_id: data.person_id,
 249     };
 250     if data.added {
 251       let join = move |conn: &'_ _| CommunityModerator::join(conn, &community_moderator_form);
 252       if blocking(context.pool(), join).await?.is_err() {
 253         return Err(ApiError::err("community_moderator_already_exists").into());
 254       }
 255     } else {
 256       let leave = move |conn: &'_ _| CommunityModerator::leave(conn, &community_moderator_form);
 257       if blocking(context.pool(), leave).await?.is_err() {
 258         return Err(ApiError::err("community_moderator_already_exists").into());
 259       }
 260     }
 261
 262     // Mod tables
 263     let form = ModAddCommunityForm {
 264       mod_person_id: local_user_view.person.id,
 265       other_person_id: data.person_id,
 266       community_id: data.community_id,
 267       removed: Some(!data.added),
 268     };
 269     blocking(context.pool(), move |conn| {
 270       ModAddCommunity::create(conn, &form)
 271     })
 272     .await??;
 273
 274     // Send to federated instances
 275     let updated_mod_id = data.person_id;
 276     let updated_mod = blocking(context.pool(), move |conn| {
 277       Person::read(conn, updated_mod_id)
 278     })
 279     .await??;
 280     let community = blocking(context.pool(), move |conn| {
 281       Community::read(conn, community_id)
 282     })
 283     .await??;
 284     if data.added {
 285       community
 286         .send_add_mod(&local_user_view.person, updated_mod, context)
 287         .await?;
 288     } else {
 289       community
 290         .send_remove_mod(&local_user_view.person, updated_mod, context)
 291         .await?;
 292     }
 293
 294     // Note: in case a remote mod is added, this returns the old moderators list, it will only get
 295     //       updated once we receive an activity from the community (like `Announce/Add/Moderator`)
 296     let community_id = data.community_id;
 297     let moderators = blocking(context.pool(), move |conn| {
 298       CommunityModeratorView::for_community(conn, community_id)
 299     })
 300     .await??;
 301
 302     let res = AddModToCommunityResponse { moderators };
 303     context.chat_server().do_send(SendCommunityRoomMessage {
 304       op: UserOperation::AddModToCommunity,
 305       response: res.clone(),
 306       community_id,
 307       websocket_id,
 308     });
 309     Ok(res)
 310   }
 311 }
 312
 313 // TODO: we dont do anything for federation here, it should be updated the next time the community
 314 //       gets fetched. i hope we can get rid of the community creator role soon.
 315 #[async_trait::async_trait(?Send)]
 316 impl Perform for TransferCommunity {
 317   type Response = GetCommunityResponse;
 318
 319   async fn perform(
 320     &self,
 321     context: &Data<LemmyContext>,
 322     _websocket_id: Option<ConnectionId>,
 323   ) -> Result<GetCommunityResponse, LemmyError> {
 324     let data: &TransferCommunity = &self;
 325     let local_user_view = get_local_user_view_from_jwt(&data.auth, context.pool()).await?;
 326
 327     let community_id = data.community_id;
 328     let read_community = blocking(context.pool(), move |conn| {
 329       Community::read(conn, community_id)
 330     })
 331     .await??;
 332
 333     let site_creator_id = blocking(context.pool(), move |conn| {
 334       Site::read(conn, 1).map(|s| s.creator_id)
 335     })
 336     .await??;
 337
 338     let mut admins = blocking(context.pool(), move |conn| PersonViewSafe::admins(conn)).await??;
 339
 340     // Making sure the creator, if an admin, is at the top
 341     let creator_index = admins
 342       .iter()
 343       .position(|r| r.person.id == site_creator_id)
 344       .context(location_info!())?;
 345     let creator_person = admins.remove(creator_index);
 346     admins.insert(0, creator_person);
 347
 348     // Make sure user is the creator, or an admin
 349     if local_user_view.person.id != read_community.creator_id
 350       && !admins
 351         .iter()
 352         .map(|a| a.person.id)
 353         .any(|x| x == local_user_view.person.id)
 354     {
 355       return Err(ApiError::err("not_an_admin").into());
 356     }
 357
 358     let community_id = data.community_id;
 359     let new_creator = data.person_id;
 360     let update = move |conn: &'_ _| Community::update_creator(conn, community_id, new_creator);
 361     if blocking(context.pool(), update).await?.is_err() {
 362       return Err(ApiError::err("couldnt_update_community").into());
 363     };
 364
 365     // You also have to re-do the community_moderator table, reordering it.
 366     let community_id = data.community_id;
 367     let mut community_mods = blocking(context.pool(), move |conn| {
 368       CommunityModeratorView::for_community(conn, community_id)
 369     })
 370     .await??;
 371     let creator_index = community_mods
 372       .iter()
 373       .position(|r| r.moderator.id == data.person_id)
 374       .context(location_info!())?;
 375     let creator_person = community_mods.remove(creator_index);
 376     community_mods.insert(0, creator_person);
 377
 378     let community_id = data.community_id;
 379     blocking(context.pool(), move |conn| {
 380       CommunityModerator::delete_for_community(conn, community_id)
 381     })
 382     .await??;
 383
 384     // TODO: this should probably be a bulk operation
 385     for cmod in &community_mods {
 386       let community_moderator_form = CommunityModeratorForm {
 387         community_id: cmod.community.id,
 388         person_id: cmod.moderator.id,
 389       };
 390
 391       let join = move |conn: &'_ _| CommunityModerator::join(conn, &community_moderator_form);
 392       if blocking(context.pool(), join).await?.is_err() {
 393         return Err(ApiError::err("community_moderator_already_exists").into());
 394       }
 395     }
 396
 397     // Mod tables
 398     let form = ModAddCommunityForm {
 399       mod_person_id: local_user_view.person.id,
 400       other_person_id: data.person_id,
 401       community_id: data.community_id,
 402       removed: Some(false),
 403     };
 404     blocking(context.pool(), move |conn| {
 405       ModAddCommunity::create(conn, &form)
 406     })
 407     .await??;
 408
 409     let community_id = data.community_id;
 410     let person_id = local_user_view.person.id;
 411     let community_view = match blocking(context.pool(), move |conn| {
 412       CommunityView::read(conn, community_id, Some(person_id))
 413     })
 414     .await?
 415     {
 416       Ok(community) => community,
 417       Err(_e) => return Err(ApiError::err("couldnt_find_community").into()),
 418     };
 419
 420     let community_id = data.community_id;
 421     let moderators = match blocking(context.pool(), move |conn| {
 422       CommunityModeratorView::for_community(conn, community_id)
 423     })
 424     .await?
 425     {
 426       Ok(moderators) => moderators,
 427       Err(_e) => return Err(ApiError::err("couldnt_find_community").into()),
 428     };
 429
 430     // Return the jwt
 431     Ok(GetCommunityResponse {
 432       community_view,
 433       moderators,
 434       online: 0,
 435     })
 436   }
 437 }