lemmy_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::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_db::{
  52   community::{Community, CommunityFollower},
  53   private_message::PrivateMessage,
  54   user::User_,
  55   ApubObject,
  56   Followable,
  57 };
  58 use lemmy_structs::blocking;
  59 use lemmy_utils::{location_info, LemmyError};
  60 use lemmy_websocket::LemmyContext;
  61 use log::debug;
  62 use serde::{Deserialize, Serialize};
  63 use std::fmt::Debug;
  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_str()
 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 /// Takes an announce and passes the inner activity to the appropriate handler.
 240 async fn receive_announce(
 241   context: &LemmyContext,
 242   activity: AnyBase,
 243   actor: &dyn ActorType,
 244   request_counter: &mut i32,
 245 ) -> Result<(), LemmyError> {
 246   let announce = Announce::from_any_base(activity)?.context(location_info!())?;
 247   verify_activity_domains_valid(&announce, &actor.actor_id()?, false)?;
 248   is_addressed_to_public(&announce)?;
 249
 250   let kind = announce.object().as_single_kind_str();
 251   let inner_activity = announce
 252     .object()
 253     .to_owned()
 254     .one()
 255     .context(location_info!())?;
 256
 257   let inner_id = inner_activity.id().context(location_info!())?.to_owned();
 258   check_is_apub_id_valid(&inner_id)?;
 259   if is_activity_already_known(context.pool(), &inner_id).await? {
 260     return Ok(());
 261   }
 262
 263   match kind {
 264     Some("Create") => {
 265       receive_create_for_community(context, inner_activity, &inner_id, request_counter).await
 266     }
 267     Some("Update") => {
 268       receive_update_for_community(context, inner_activity, &inner_id, request_counter).await
 269     }
 270     Some("Like") => {
 271       receive_like_for_community(context, inner_activity, &inner_id, request_counter).await
 272     }
 273     Some("Dislike") => {
 274       receive_dislike_for_community(context, inner_activity, &inner_id, request_counter).await
 275     }
 276     Some("Delete") => receive_delete_for_community(context, inner_activity, &inner_id).await,
 277     Some("Remove") => receive_remove_for_community(context, inner_activity, &inner_id).await,
 278     Some("Undo") => {
 279       receive_undo_for_community(context, inner_activity, &inner_id, request_counter).await
 280     }
 281     _ => receive_unhandled_activity(inner_activity),
 282   }
 283 }
 284
 285 async fn receive_create(
 286   context: &LemmyContext,
 287   activity: AnyBase,
 288   expected_domain: Url,
 289   request_counter: &mut i32,
 290 ) -> Result<(), LemmyError> {
 291   let create = Create::from_any_base(activity)?.context(location_info!())?;
 292   verify_activity_domains_valid(&create, &expected_domain, true)?;
 293   if is_addressed_to_public(&create).is_ok() {
 294     receive_create_comment(create, context, request_counter).await
 295   } else {
 296     receive_create_private_message(&context, create, expected_domain, request_counter).await
 297   }
 298 }
 299
 300 async fn receive_update(
 301   context: &LemmyContext,
 302   activity: AnyBase,
 303   expected_domain: Url,
 304   request_counter: &mut i32,
 305 ) -> Result<(), LemmyError> {
 306   let update = Update::from_any_base(activity)?.context(location_info!())?;
 307   verify_activity_domains_valid(&update, &expected_domain, true)?;
 308   if is_addressed_to_public(&update).is_ok() {
 309     receive_update_comment(update, context, request_counter).await
 310   } else {
 311     receive_update_private_message(&context, update, expected_domain, request_counter).await
 312   }
 313 }
 314
 315 async fn receive_delete(
 316   context: &LemmyContext,
 317   any_base: AnyBase,
 318   expected_domain: &Url,
 319   request_counter: &mut i32,
 320 ) -> Result<(), LemmyError> {
 321   use CommunityOrPrivateMessage::*;
 322
 323   let delete = Delete::from_any_base(any_base.clone())?.context(location_info!())?;
 324   verify_activity_domains_valid(&delete, expected_domain, true)?;
 325   let object_uri = delete
 326     .object()
 327     .to_owned()
 328     .single_xsd_any_uri()
 329     .context(location_info!())?;
 330
 331   match find_community_or_private_message_by_id(context, object_uri).await? {
 332     Community(c) => receive_delete_community(context, c).await,
 333     PrivateMessage(p) => receive_delete_private_message(context, delete, p, request_counter).await,
 334   }
 335 }
 336
 337 async fn receive_undo(
 338   context: &LemmyContext,
 339   any_base: AnyBase,
 340   expected_domain: &Url,
 341   request_counter: &mut i32,
 342 ) -> Result<(), LemmyError> {
 343   use CommunityOrPrivateMessage::*;
 344   let undo = Undo::from_any_base(any_base)?.context(location_info!())?;
 345   verify_activity_domains_valid(&undo, expected_domain, true)?;
 346
 347   let inner_activity = undo.object().to_owned().one().context(location_info!())?;
 348   let kind = inner_activity.kind_str();
 349   match kind {
 350     Some("Delete") => {
 351       let delete = Delete::from_any_base(inner_activity)?.context(location_info!())?;
 352       verify_activity_domains_valid(&delete, expected_domain, true)?;
 353       let object_uri = delete
 354         .object()
 355         .to_owned()
 356         .single_xsd_any_uri()
 357         .context(location_info!())?;
 358       match find_community_or_private_message_by_id(context, object_uri).await? {
 359         Community(c) => receive_undo_delete_community(context, undo, c, expected_domain).await,
 360         PrivateMessage(p) => {
 361           receive_undo_delete_private_message(context, undo, expected_domain, p, request_counter)
 362             .await
 363         }
 364       }
 365     }
 366     Some("Remove") => receive_undo_remove_community(context, undo, expected_domain).await,
 367     _ => receive_unhandled_activity(undo),
 368   }
 369 }
 370 enum CommunityOrPrivateMessage {
 371   Community(Community),
 372   PrivateMessage(PrivateMessage),
 373 }
 374
 375 async fn find_community_or_private_message_by_id(
 376   context: &LemmyContext,
 377   apub_id: Url,
 378 ) -> Result<CommunityOrPrivateMessage, LemmyError> {
 379   let ap_id = apub_id.to_string();
 380   let community = blocking(context.pool(), move |conn| {
 381     Community::read_from_apub_id(conn, &ap_id)
 382   })
 383   .await?;
 384   if let Ok(c) = community {
 385     return Ok(CommunityOrPrivateMessage::Community(c));
 386   }
 387
 388   let ap_id = apub_id.to_string();
 389   let private_message = blocking(context.pool(), move |conn| {
 390     PrivateMessage::read_from_apub_id(conn, &ap_id)
 391   })
 392   .await?;
 393   if let Ok(p) = private_message {
 394     return Ok(CommunityOrPrivateMessage::PrivateMessage(p));
 395   }
 396
 397   return Err(NotFound.into());
 398 }