crates/apub/src/inbox/user_inbox.rs

   1 use crate::{
   2   activities::receive::{
   3     comment::{receive_create_comment, receive_update_comment},
   4     community::{
   5       receive_delete_community,
   6       receive_remove_community,
   7       receive_undo_delete_community,
   8       receive_undo_remove_community,
   9     },
  10     private_message::{
  11       receive_create_private_message,
  12       receive_delete_private_message,
  13       receive_undo_delete_private_message,
  14       receive_update_private_message,
  15     },
  16     receive_unhandled_activity,
  17     verify_activity_domains_valid,
  18   },
  19   check_is_apub_id_valid,
  20   fetcher::community::get_or_fetch_and_upsert_community,
  21   inbox::{
  22     assert_activity_not_local,
  23     get_activity_id,
  24     get_activity_to_and_cc,
  25     inbox_verify_http_signature,
  26     is_activity_already_known,
  27     is_addressed_to_community_followers,
  28     is_addressed_to_local_user,
  29     is_addressed_to_public,
  30     receive_for_community::{
  31       receive_create_for_community,
  32       receive_delete_for_community,
  33       receive_dislike_for_community,
  34       receive_like_for_community,
  35       receive_remove_for_community,
  36       receive_undo_for_community,
  37       receive_update_for_community,
  38     },
  39   },
  40   insert_activity,
  41   ActorType,
  42 };
  43 use activitystreams::{
  44   activity::{Accept, ActorAndObject, Announce, Create, Delete, Follow, Undo, Update},
  45   base::AnyBase,
  46   prelude::*,
  47 };
  48 use actix_web::{web, HttpRequest, HttpResponse};
  49 use anyhow::{anyhow, Context};
  50 use diesel::NotFound;
  51 use lemmy_api_structs::blocking;
  52 use lemmy_db_queries::{source::user::User, ApubObject, Followable};
  53 use lemmy_db_schema::source::{
  54   community::{Community, CommunityFollower},
  55   private_message::PrivateMessage,
  56   user::User_,
  57 };
  58 use lemmy_utils::{location_info, LemmyError};
  59 use lemmy_websocket::LemmyContext;
  60 use log::debug;
  61 use serde::{Deserialize, Serialize};
  62 use std::fmt::Debug;
  63 use strum_macros::EnumString;
  64 use url::Url;
  65
  66 /// Allowed activities for user inbox.
  67 #[derive(Clone, Debug, Eq, Ord, PartialEq, PartialOrd, Deserialize, Serialize)]
  68 #[serde(rename_all = "PascalCase")]
  69 pub enum UserValidTypes {
  70   Accept,   // community accepted our follow request
  71   Create,   // create private message
  72   Update,   // edit private message
  73   Delete,   // private message or community deleted by creator
  74   Undo,     // private message or community restored
  75   Remove,   // community removed by admin
  76   Announce, // post, comment or vote in community
  77 }
  78
  79 pub type UserAcceptedActivities = ActorAndObject<UserValidTypes>;
  80
  81 /// Handler for all incoming activities to user inboxes.
  82 pub async fn user_inbox(
  83   request: HttpRequest,
  84   input: web::Json<UserAcceptedActivities>,
  85   path: web::Path<String>,
  86   context: web::Data<LemmyContext>,
  87 ) -> Result<HttpResponse, LemmyError> {
  88   let activity = input.into_inner();
  89   // First of all check the http signature
  90   let request_counter = &mut 0;
  91   let actor = inbox_verify_http_signature(&activity, &context, request, request_counter).await?;
  92
  93   // Do nothing if we received the same activity before
  94   let activity_id = get_activity_id(&activity, &actor.actor_id())?;
  95   if is_activity_already_known(context.pool(), &activity_id).await? {
  96     return Ok(HttpResponse::Ok().finish());
  97   }
  98
  99   // Check if the activity is actually meant for us
 100   let username = path.into_inner();
 101   let user = blocking(&context.pool(), move |conn| {
 102     User_::read_from_name(&conn, &username)
 103   })
 104   .await??;
 105   let to_and_cc = get_activity_to_and_cc(&activity);
 106   // TODO: we should also accept activities that are sent to community followers
 107   if !to_and_cc.contains(&&user.actor_id()) {
 108     return Err(anyhow!("Activity delivered to wrong user").into());
 109   }
 110
 111   assert_activity_not_local(&activity)?;
 112   insert_activity(&activity_id, activity.clone(), false, true, context.pool()).await?;
 113
 114   debug!(
 115     "User {} received activity {:?} from {}",
 116     user.name,
 117     &activity.id_unchecked(),
 118     &actor.actor_id()
 119   );
 120
 121   user_receive_message(
 122     activity.clone(),
 123     Some(user.clone()),
 124     actor.as_ref(),
 125     &context,
 126     request_counter,
 127   )
 128   .await
 129 }
 130
 131 /// Receives Accept/Follow, Announce, private messages and community (undo) remove, (undo) delete
 132 pub(crate) async fn user_receive_message(
 133   activity: UserAcceptedActivities,
 134   to_user: Option<User_>,
 135   actor: &dyn ActorType,
 136   context: &LemmyContext,
 137   request_counter: &mut i32,
 138 ) -> Result<HttpResponse, LemmyError> {
 139   is_for_user_inbox(context, &activity).await?;
 140
 141   let any_base = activity.clone().into_any_base()?;
 142   let kind = activity.kind().context(location_info!())?;
 143   let actor_url = actor.actor_id();
 144   match kind {
 145     UserValidTypes::Accept => {
 146       receive_accept(&context, any_base, actor, to_user.unwrap(), request_counter).await?;
 147     }
 148     UserValidTypes::Announce => {
 149       receive_announce(&context, any_base, actor, request_counter).await?
 150     }
 151     UserValidTypes::Create => {
 152       receive_create(&context, any_base, actor_url, request_counter).await?
 153     }
 154     UserValidTypes::Update => {
 155       receive_update(&context, any_base, actor_url, request_counter).await?
 156     }
 157     UserValidTypes::Delete => {
 158       receive_delete(context, any_base, &actor_url, request_counter).await?
 159     }
 160     UserValidTypes::Undo => receive_undo(context, any_base, &actor_url, request_counter).await?,
 161     UserValidTypes::Remove => receive_remove_community(&context, any_base, &actor_url).await?,
 162   };
 163
 164   // TODO: would be logical to move websocket notification code here
 165
 166   Ok(HttpResponse::Ok().finish())
 167 }
 168
 169 /// Returns true if the activity is addressed directly to one or more local users, or if it is
 170 /// addressed to the followers collection of a remote community, and at least one local user follows
 171 /// it.
 172 async fn is_for_user_inbox(
 173   context: &LemmyContext,
 174   activity: &UserAcceptedActivities,
 175 ) -> Result<(), LemmyError> {
 176   let to_and_cc = get_activity_to_and_cc(activity);
 177   // Check if it is addressed directly to any local user
 178   if is_addressed_to_local_user(&to_and_cc, context.pool()).await? {
 179     return Ok(());
 180   }
 181
 182   // Check if it is addressed to any followers collection of a remote community, and that the
 183   // community has local followers.
 184   let community = is_addressed_to_community_followers(&to_and_cc, context.pool()).await?;
 185   if let Some(c) = community {
 186     let community_id = c.id;
 187     let has_local_followers = blocking(&context.pool(), move |conn| {
 188       CommunityFollower::has_local_followers(conn, community_id)
 189     })
 190     .await??;
 191     if c.local {
 192       return Err(
 193         anyhow!("Remote activity cant be addressed to followers of local community").into(),
 194       );
 195     }
 196     if has_local_followers {
 197       return Ok(());
 198     }
 199   }
 200
 201   Err(anyhow!("Not addressed for any local user").into())
 202 }
 203
 204 /// Handle accepted follows.
 205 async fn receive_accept(
 206   context: &LemmyContext,
 207   activity: AnyBase,
 208   actor: &dyn ActorType,
 209   user: User_,
 210   request_counter: &mut i32,
 211 ) -> Result<(), LemmyError> {
 212   let accept = Accept::from_any_base(activity)?.context(location_info!())?;
 213   verify_activity_domains_valid(&accept, &actor.actor_id(), false)?;
 214
 215   let object = accept.object().to_owned().one().context(location_info!())?;
 216   let follow = Follow::from_any_base(object)?.context(location_info!())?;
 217   verify_activity_domains_valid(&follow, &user.actor_id(), false)?;
 218
 219   let community_uri = accept
 220     .actor()?
 221     .to_owned()
 222     .single_xsd_any_uri()
 223     .context(location_info!())?;
 224
 225   let community =
 226     get_or_fetch_and_upsert_community(&community_uri, context, request_counter).await?;
 227
 228   let community_id = community.id;
 229   let user_id = user.id;
 230   // This will throw an error if no follow was requested
 231   blocking(&context.pool(), move |conn| {
 232     CommunityFollower::follow_accepted(conn, community_id, user_id)
 233   })
 234   .await??;
 235
 236   Ok(())
 237 }
 238
 239 #[derive(EnumString)]
 240 enum AnnouncableActivities {
 241   Create,
 242   Update,
 243   Like,
 244   Dislike,
 245   Delete,
 246   Remove,
 247   Undo,
 248 }
 249
 250 /// Takes an announce and passes the inner activity to the appropriate handler.
 251 pub async fn receive_announce(
 252   context: &LemmyContext,
 253   activity: AnyBase,
 254   actor: &dyn ActorType,
 255   request_counter: &mut i32,
 256 ) -> Result<(), LemmyError> {
 257   let announce = Announce::from_any_base(activity)?.context(location_info!())?;
 258   verify_activity_domains_valid(&announce, &actor.actor_id(), false)?;
 259   is_addressed_to_public(&announce)?;
 260
 261   let kind = announce
 262     .object()
 263     .as_single_kind_str()
 264     .and_then(|s| s.parse().ok());
 265   let inner_activity = announce
 266     .object()
 267     .to_owned()
 268     .one()
 269     .context(location_info!())?;
 270
 271   let inner_id = inner_activity.id().context(location_info!())?.to_owned();
 272   check_is_apub_id_valid(&inner_id)?;
 273   if is_activity_already_known(context.pool(), &inner_id).await? {
 274     return Ok(());
 275   }
 276
 277   use AnnouncableActivities::*;
 278   match kind {
 279     Some(Create) => {
 280       receive_create_for_community(context, inner_activity, &inner_id, request_counter).await
 281     }
 282     Some(Update) => {
 283       receive_update_for_community(context, inner_activity, &inner_id, request_counter).await
 284     }
 285     Some(Like) => {
 286       receive_like_for_community(context, inner_activity, &inner_id, request_counter).await
 287     }
 288     Some(Dislike) => {
 289       receive_dislike_for_community(context, inner_activity, &inner_id, request_counter).await
 290     }
 291     Some(Delete) => receive_delete_for_community(context, inner_activity, &inner_id).await,
 292     Some(Remove) => receive_remove_for_community(context, inner_activity, &inner_id).await,
 293     Some(Undo) => {
 294       receive_undo_for_community(context, inner_activity, &inner_id, request_counter).await
 295     }
 296     _ => receive_unhandled_activity(inner_activity),
 297   }
 298 }
 299
 300 async fn receive_create(
 301   context: &LemmyContext,
 302   activity: AnyBase,
 303   expected_domain: Url,
 304   request_counter: &mut i32,
 305 ) -> Result<(), LemmyError> {
 306   let create = Create::from_any_base(activity)?.context(location_info!())?;
 307   verify_activity_domains_valid(&create, &expected_domain, true)?;
 308   if is_addressed_to_public(&create).is_ok() {
 309     receive_create_comment(create, context, request_counter).await
 310   } else {
 311     receive_create_private_message(&context, create, expected_domain, request_counter).await
 312   }
 313 }
 314
 315 async fn receive_update(
 316   context: &LemmyContext,
 317   activity: AnyBase,
 318   expected_domain: Url,
 319   request_counter: &mut i32,
 320 ) -> Result<(), LemmyError> {
 321   let update = Update::from_any_base(activity)?.context(location_info!())?;
 322   verify_activity_domains_valid(&update, &expected_domain, true)?;
 323   if is_addressed_to_public(&update).is_ok() {
 324     receive_update_comment(update, context, request_counter).await
 325   } else {
 326     receive_update_private_message(&context, update, expected_domain, request_counter).await
 327   }
 328 }
 329
 330 async fn receive_delete(
 331   context: &LemmyContext,
 332   any_base: AnyBase,
 333   expected_domain: &Url,
 334   request_counter: &mut i32,
 335 ) -> Result<(), LemmyError> {
 336   use CommunityOrPrivateMessage::*;
 337
 338   let delete = Delete::from_any_base(any_base.clone())?.context(location_info!())?;
 339   verify_activity_domains_valid(&delete, expected_domain, true)?;
 340   let object_uri = delete
 341     .object()
 342     .to_owned()
 343     .single_xsd_any_uri()
 344     .context(location_info!())?;
 345
 346   match find_community_or_private_message_by_id(context, object_uri).await? {
 347     Community(c) => receive_delete_community(context, c).await,
 348     PrivateMessage(p) => receive_delete_private_message(context, delete, p, request_counter).await,
 349   }
 350 }
 351
 352 async fn receive_undo(
 353   context: &LemmyContext,
 354   any_base: AnyBase,
 355   expected_domain: &Url,
 356   request_counter: &mut i32,
 357 ) -> Result<(), LemmyError> {
 358   use CommunityOrPrivateMessage::*;
 359   let undo = Undo::from_any_base(any_base)?.context(location_info!())?;
 360   verify_activity_domains_valid(&undo, expected_domain, true)?;
 361
 362   let inner_activity = undo.object().to_owned().one().context(location_info!())?;
 363   let kind = inner_activity.kind_str();
 364   match kind {
 365     Some("Delete") => {
 366       let delete = Delete::from_any_base(inner_activity)?.context(location_info!())?;
 367       verify_activity_domains_valid(&delete, expected_domain, true)?;
 368       let object_uri = delete
 369         .object()
 370         .to_owned()
 371         .single_xsd_any_uri()
 372         .context(location_info!())?;
 373       match find_community_or_private_message_by_id(context, object_uri).await? {
 374         Community(c) => receive_undo_delete_community(context, undo, c, expected_domain).await,
 375         PrivateMessage(p) => {
 376           receive_undo_delete_private_message(context, undo, expected_domain, p, request_counter)
 377             .await
 378         }
 379       }
 380     }
 381     Some("Remove") => receive_undo_remove_community(context, undo, expected_domain).await,
 382     _ => receive_unhandled_activity(undo),
 383   }
 384 }
 385 enum CommunityOrPrivateMessage {
 386   Community(Community),
 387   PrivateMessage(PrivateMessage),
 388 }
 389
 390 async fn find_community_or_private_message_by_id(
 391   context: &LemmyContext,
 392   apub_id: Url,
 393 ) -> Result<CommunityOrPrivateMessage, LemmyError> {
 394   let ap_id = apub_id.to_owned();
 395   let community = blocking(context.pool(), move |conn| {
 396     Community::read_from_apub_id(conn, &ap_id.into())
 397   })
 398   .await?;
 399   if let Ok(c) = community {
 400     return Ok(CommunityOrPrivateMessage::Community(c));
 401   }
 402
 403   let ap_id = apub_id.to_owned();
 404   let private_message = blocking(context.pool(), move |conn| {
 405     PrivateMessage::read_from_apub_id(conn, &ap_id.into())
 406   })
 407   .await?;
 408   if let Ok(p) = private_message {
 409     return Ok(CommunityOrPrivateMessage::PrivateMessage(p));
 410   }
 411
 412   Err(NotFound.into())
 413 }