3 comment::{receive_create_comment, receive_update_comment},
5 receive_delete_community,
6 receive_remove_community,
7 receive_undo_delete_community,
8 receive_undo_remove_community,
11 receive_create_private_message,
12 receive_delete_private_message,
13 receive_undo_delete_private_message,
14 receive_update_private_message,
16 receive_unhandled_activity,
17 verify_activity_domains_valid,
19 check_is_apub_id_valid,
20 fetcher::community::get_or_fetch_and_upsert_community,
22 assert_activity_not_local,
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,
43 use activitystreams::{
44 activity::{Accept, ActorAndObject, Announce, Create, Delete, Follow, Undo, Update},
48 use actix_web::{web, HttpRequest, HttpResponse};
49 use anyhow::{anyhow, Context};
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,
58 use lemmy_utils::{location_info, LemmyError};
59 use lemmy_websocket::LemmyContext;
61 use serde::{Deserialize, Serialize};
63 use strum_macros::EnumString;
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
79 pub type UserAcceptedActivities = ActorAndObject<UserValidTypes>;
81 /// Handler for all incoming activities to user inboxes.
82 pub async fn user_inbox(
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?;
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());
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)
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());
111 assert_activity_not_local(&activity)?;
112 insert_activity(&activity_id, activity.clone(), false, true, context.pool()).await?;
115 "User {} received activity {:?} from {}",
117 &activity.id_unchecked(),
121 user_receive_message(
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?;
141 let any_base = activity.clone().into_any_base()?;
142 let kind = activity.kind().context(location_info!())?;
143 let actor_url = actor.actor_id();
145 UserValidTypes::Accept => {
150 to_user.expect("user provided"),
155 UserValidTypes::Announce => {
156 receive_announce(&context, any_base, actor, request_counter).await?
158 UserValidTypes::Create => {
159 receive_create(&context, any_base, actor_url, request_counter).await?
161 UserValidTypes::Update => {
162 receive_update(&context, any_base, actor_url, request_counter).await?
164 UserValidTypes::Delete => {
165 receive_delete(context, any_base, &actor_url, request_counter).await?
167 UserValidTypes::Undo => receive_undo(context, any_base, &actor_url, request_counter).await?,
168 UserValidTypes::Remove => receive_remove_community(&context, any_base, &actor_url).await?,
171 // TODO: would be logical to move websocket notification code here
173 Ok(HttpResponse::Ok().finish())
176 /// Returns true if the activity is addressed directly to one or more local users, or if it is
177 /// addressed to the followers collection of a remote community, and at least one local user follows
179 async fn is_for_user_inbox(
180 context: &LemmyContext,
181 activity: &UserAcceptedActivities,
182 ) -> Result<(), LemmyError> {
183 let to_and_cc = get_activity_to_and_cc(activity);
184 // Check if it is addressed directly to any local user
185 if is_addressed_to_local_user(&to_and_cc, context.pool()).await? {
189 // Check if it is addressed to any followers collection of a remote community, and that the
190 // community has local followers.
191 let community = is_addressed_to_community_followers(&to_and_cc, context.pool()).await?;
192 if let Some(c) = community {
193 let community_id = c.id;
194 let has_local_followers = blocking(&context.pool(), move |conn| {
195 CommunityFollower::has_local_followers(conn, community_id)
200 anyhow!("Remote activity cant be addressed to followers of local community").into(),
203 if has_local_followers {
208 Err(anyhow!("Not addressed for any local user").into())
211 /// Handle accepted follows.
212 async fn receive_accept(
213 context: &LemmyContext,
215 actor: &dyn ActorType,
217 request_counter: &mut i32,
218 ) -> Result<(), LemmyError> {
219 let accept = Accept::from_any_base(activity)?.context(location_info!())?;
220 verify_activity_domains_valid(&accept, &actor.actor_id(), false)?;
222 let object = accept.object().to_owned().one().context(location_info!())?;
223 let follow = Follow::from_any_base(object)?.context(location_info!())?;
224 verify_activity_domains_valid(&follow, &user.actor_id(), false)?;
226 let community_uri = accept
229 .single_xsd_any_uri()
230 .context(location_info!())?;
233 get_or_fetch_and_upsert_community(&community_uri, context, request_counter).await?;
235 let community_id = community.id;
236 let user_id = user.id;
237 // This will throw an error if no follow was requested
238 blocking(&context.pool(), move |conn| {
239 CommunityFollower::follow_accepted(conn, community_id, user_id)
246 #[derive(EnumString)]
247 enum AnnouncableActivities {
257 /// Takes an announce and passes the inner activity to the appropriate handler.
258 pub async fn receive_announce(
259 context: &LemmyContext,
261 actor: &dyn ActorType,
262 request_counter: &mut i32,
263 ) -> Result<(), LemmyError> {
264 let announce = Announce::from_any_base(activity)?.context(location_info!())?;
265 verify_activity_domains_valid(&announce, &actor.actor_id(), false)?;
266 is_addressed_to_public(&announce)?;
270 .as_single_kind_str()
271 .and_then(|s| s.parse().ok());
272 let inner_activity = announce
276 .context(location_info!())?;
278 let inner_id = inner_activity.id().context(location_info!())?.to_owned();
279 check_is_apub_id_valid(&inner_id)?;
280 if is_activity_already_known(context.pool(), &inner_id).await? {
284 use AnnouncableActivities::*;
287 receive_create_for_community(context, inner_activity, &inner_id, request_counter).await
290 receive_update_for_community(context, inner_activity, &inner_id, request_counter).await
293 receive_like_for_community(context, inner_activity, &inner_id, request_counter).await
296 receive_dislike_for_community(context, inner_activity, &inner_id, request_counter).await
298 Some(Delete) => receive_delete_for_community(context, inner_activity, &inner_id).await,
300 receive_remove_for_community(context, inner_activity, &inner_id, request_counter).await
303 receive_undo_for_community(context, inner_activity, &inner_id, request_counter).await
305 _ => receive_unhandled_activity(inner_activity),
309 async fn receive_create(
310 context: &LemmyContext,
312 expected_domain: Url,
313 request_counter: &mut i32,
314 ) -> Result<(), LemmyError> {
315 let create = Create::from_any_base(activity)?.context(location_info!())?;
316 verify_activity_domains_valid(&create, &expected_domain, true)?;
317 if is_addressed_to_public(&create).is_ok() {
318 receive_create_comment(create, context, request_counter).await
320 receive_create_private_message(&context, create, expected_domain, request_counter).await
324 async fn receive_update(
325 context: &LemmyContext,
327 expected_domain: Url,
328 request_counter: &mut i32,
329 ) -> Result<(), LemmyError> {
330 let update = Update::from_any_base(activity)?.context(location_info!())?;
331 verify_activity_domains_valid(&update, &expected_domain, true)?;
332 if is_addressed_to_public(&update).is_ok() {
333 receive_update_comment(update, context, request_counter).await
335 receive_update_private_message(&context, update, expected_domain, request_counter).await
339 async fn receive_delete(
340 context: &LemmyContext,
342 expected_domain: &Url,
343 request_counter: &mut i32,
344 ) -> Result<(), LemmyError> {
345 use CommunityOrPrivateMessage::*;
347 let delete = Delete::from_any_base(any_base.clone())?.context(location_info!())?;
348 verify_activity_domains_valid(&delete, expected_domain, true)?;
349 let object_uri = delete
352 .single_xsd_any_uri()
353 .context(location_info!())?;
355 match find_community_or_private_message_by_id(context, object_uri).await? {
356 Community(c) => receive_delete_community(context, c).await,
357 PrivateMessage(p) => receive_delete_private_message(context, delete, p, request_counter).await,
361 async fn receive_undo(
362 context: &LemmyContext,
364 expected_domain: &Url,
365 request_counter: &mut i32,
366 ) -> Result<(), LemmyError> {
367 use CommunityOrPrivateMessage::*;
368 let undo = Undo::from_any_base(any_base)?.context(location_info!())?;
369 verify_activity_domains_valid(&undo, expected_domain, true)?;
371 let inner_activity = undo.object().to_owned().one().context(location_info!())?;
372 let kind = inner_activity.kind_str();
375 let delete = Delete::from_any_base(inner_activity)?.context(location_info!())?;
376 verify_activity_domains_valid(&delete, expected_domain, true)?;
377 let object_uri = delete
380 .single_xsd_any_uri()
381 .context(location_info!())?;
382 match find_community_or_private_message_by_id(context, object_uri).await? {
383 Community(c) => receive_undo_delete_community(context, undo, c, expected_domain).await,
384 PrivateMessage(p) => {
385 receive_undo_delete_private_message(context, undo, expected_domain, p, request_counter)
390 Some("Remove") => receive_undo_remove_community(context, undo, expected_domain).await,
391 _ => receive_unhandled_activity(undo),
394 enum CommunityOrPrivateMessage {
395 Community(Community),
396 PrivateMessage(PrivateMessage),
399 async fn find_community_or_private_message_by_id(
400 context: &LemmyContext,
402 ) -> Result<CommunityOrPrivateMessage, LemmyError> {
403 let ap_id = apub_id.to_owned();
404 let community = blocking(context.pool(), move |conn| {
405 Community::read_from_apub_id(conn, &ap_id.into())
408 if let Ok(c) = community {
409 return Ok(CommunityOrPrivateMessage::Community(c));
412 let ap_id = apub_id.to_owned();
413 let private_message = blocking(context.pool(), move |conn| {
414 PrivateMessage::read_from_apub_id(conn, &ap_id.into())
417 if let Ok(p) = private_message {
418 return Ok(CommunityOrPrivateMessage::PrivateMessage(p));