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 => {
146 receive_accept(&context, any_base, actor, to_user.unwrap(), request_counter).await?;
148 UserValidTypes::Announce => {
149 receive_announce(&context, any_base, actor, request_counter).await?
151 UserValidTypes::Create => {
152 receive_create(&context, any_base, actor_url, request_counter).await?
154 UserValidTypes::Update => {
155 receive_update(&context, any_base, actor_url, request_counter).await?
157 UserValidTypes::Delete => {
158 receive_delete(context, any_base, &actor_url, request_counter).await?
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?,
164 // TODO: would be logical to move websocket notification code here
166 Ok(HttpResponse::Ok().finish())
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
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? {
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)
193 anyhow!("Remote activity cant be addressed to followers of local community").into(),
196 if has_local_followers {
201 Err(anyhow!("Not addressed for any local user").into())
204 /// Handle accepted follows.
205 async fn receive_accept(
206 context: &LemmyContext,
208 actor: &dyn ActorType,
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)?;
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)?;
219 let community_uri = accept
222 .single_xsd_any_uri()
223 .context(location_info!())?;
226 get_or_fetch_and_upsert_community(&community_uri, context, request_counter).await?;
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)
239 #[derive(EnumString)]
240 enum AnnouncableActivities {
250 /// Takes an announce and passes the inner activity to the appropriate handler.
251 pub async fn receive_announce(
252 context: &LemmyContext,
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)?;
263 .as_single_kind_str()
264 .and_then(|s| s.parse().ok());
265 let inner_activity = announce
269 .context(location_info!())?;
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? {
277 use AnnouncableActivities::*;
280 receive_create_for_community(context, inner_activity, &inner_id, request_counter).await
283 receive_update_for_community(context, inner_activity, &inner_id, request_counter).await
286 receive_like_for_community(context, inner_activity, &inner_id, request_counter).await
289 receive_dislike_for_community(context, inner_activity, &inner_id, request_counter).await
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,
294 receive_undo_for_community(context, inner_activity, &inner_id, request_counter).await
296 _ => receive_unhandled_activity(inner_activity),
300 async fn receive_create(
301 context: &LemmyContext,
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
311 receive_create_private_message(&context, create, expected_domain, request_counter).await
315 async fn receive_update(
316 context: &LemmyContext,
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
326 receive_update_private_message(&context, update, expected_domain, request_counter).await
330 async fn receive_delete(
331 context: &LemmyContext,
333 expected_domain: &Url,
334 request_counter: &mut i32,
335 ) -> Result<(), LemmyError> {
336 use CommunityOrPrivateMessage::*;
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
343 .single_xsd_any_uri()
344 .context(location_info!())?;
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,
352 async fn receive_undo(
353 context: &LemmyContext,
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)?;
362 let inner_activity = undo.object().to_owned().one().context(location_info!())?;
363 let kind = inner_activity.kind_str();
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
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)
381 Some("Remove") => receive_undo_remove_community(context, undo, expected_domain).await,
382 _ => receive_unhandled_activity(undo),
385 enum CommunityOrPrivateMessage {
386 Community(Community),
387 PrivateMessage(PrivateMessage),
390 async fn find_community_or_private_message_by_id(
391 context: &LemmyContext,
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())
399 if let Ok(c) = community {
400 return Ok(CommunityOrPrivateMessage::Community(c));
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())
408 if let Ok(p) = private_message {
409 return Ok(CommunityOrPrivateMessage::PrivateMessage(p));