From: Nutomic <me@nutomic.com>
Date: Thu, 11 Nov 2021 19:49:15 +0000 (+0000)
Subject: More federation compat (#1894)
X-Git-Url: http://these/git/%22https:/image.com/%22%7B%7D/static/%24%7B%60data:application/manifest%20json;base64%2C%24%7Bawait?a=commitdiff_plain;h=1b9414f292f3c48d95bb0cd3bbaf8220607f1f85;p=lemmy.git

More federation compat (#1894)

* Make HTTP signatures compatible with Pleroma

* Send Announce/Page, Announce/Note for Pleroma compatibility

* remove unused code
---

diff --git a/crates/apub/src/activities/community/announce.rs b/crates/apub/src/activities/community/announce.rs
index 6830bd13..11938184 100644
--- a/crates/apub/src/activities/community/announce.rs
+++ b/crates/apub/src/activities/community/announce.rs
@@ -26,13 +26,12 @@ pub(crate) trait GetCommunity {
 }
 
 impl AnnounceActivity {
-  pub async fn send(
+  fn new(
     object: AnnouncableActivities,
     community: &ApubCommunity,
-    additional_inboxes: Vec<Url>,
     context: &LemmyContext,
-  ) -> Result<(), LemmyError> {
-    let announce = AnnounceActivity {
+  ) -> Result<AnnounceActivity, LemmyError> {
+    Ok(AnnounceActivity {
       actor: ObjectId::new(community.actor_id()),
       to: vec![public()],
       object,
@@ -43,11 +42,49 @@ impl AnnounceActivity {
         &context.settings().get_protocol_and_hostname(),
       )?,
       unparsed: Default::default(),
-    };
+    })
+  }
+
+  pub async fn send(
+    object: AnnouncableActivities,
+    community: &ApubCommunity,
+    additional_inboxes: Vec<Url>,
+    context: &LemmyContext,
+  ) -> Result<(), LemmyError> {
+    let announce = AnnounceActivity::new(object.clone(), community, context)?;
     let inboxes = community
-      .get_follower_inboxes(additional_inboxes, context)
+      .get_follower_inboxes(additional_inboxes.clone(), context)
       .await?;
-    send_lemmy_activity(context, &announce, &announce.id, community, inboxes, false).await
+    send_lemmy_activity(
+      context,
+      &announce,
+      &announce.id,
+      community,
+      inboxes.clone(),
+      false,
+    )
+    .await?;
+
+    // Pleroma (and likely Mastodon) can't handle activities like Announce/Create/Page, so for
+    // compatibility, we also send Announce/Page and Announce/Note (for new and updated
+    // posts/comments).
+    use AnnouncableActivities::*;
+    let object = match object {
+      CreateOrUpdatePost(c) => Page(c.object),
+      CreateOrUpdateComment(c) => Note(c.object),
+      _ => return Ok(()),
+    };
+    let announce_compat = AnnounceActivity::new(object, community, context)?;
+    send_lemmy_activity(
+      context,
+      &announce_compat,
+      &announce_compat.id,
+      community,
+      inboxes,
+      false,
+    )
+    .await?;
+    Ok(())
   }
 }
 
@@ -77,14 +114,7 @@ impl ActivityHandler for AnnounceActivity {
     if is_activity_already_known(context.pool(), &object_data.id).await? {
       return Ok(());
     }
-    insert_activity(
-      &object_data.id,
-      self.object.clone(),
-      false,
-      true,
-      context.pool(),
-    )
-    .await?;
+    insert_activity(&object_data.id, &self.object, false, true, context.pool()).await?;
     self.object.receive(context, request_counter).await
   }
 }
diff --git a/crates/apub/src/activities/community/mod.rs b/crates/apub/src/activities/community/mod.rs
index b63c8b65..1b3e305d 100644
--- a/crates/apub/src/activities/community/mod.rs
+++ b/crates/apub/src/activities/community/mod.rs
@@ -28,7 +28,7 @@ pub(crate) async fn send_to_community<T: ActorType>(
 ) -> Result<(), LemmyError> {
   // if this is a local community, we need to do an announce from the community instead
   if community.local {
-    insert_activity(activity_id, activity.clone(), true, false, context.pool()).await?;
+    insert_activity(activity_id, &activity, true, false, context.pool()).await?;
     AnnounceActivity::send(activity, community, additional_inboxes, context).await?;
   } else {
     let mut inboxes = additional_inboxes;
diff --git a/crates/apub/src/activities/mod.rs b/crates/apub/src/activities/mod.rs
index a6c75376..e115769f 100644
--- a/crates/apub/src/activities/mod.rs
+++ b/crates/apub/src/activities/mod.rs
@@ -173,7 +173,7 @@ async fn send_lemmy_activity<T: Serialize>(
 
   insert_activity(
     activity_id,
-    serialised_activity.clone(),
+    &serialised_activity,
     true,
     sensitive,
     context.pool(),
diff --git a/crates/apub/src/activities/post/create_or_update.rs b/crates/apub/src/activities/post/create_or_update.rs
index 05a7f38d..3fb6a138 100644
--- a/crates/apub/src/activities/post/create_or_update.rs
+++ b/crates/apub/src/activities/post/create_or_update.rs
@@ -59,6 +59,7 @@ impl CreateOrUpdatePost {
     })
     .await??
     .into();
+
     let create_or_update = CreateOrUpdatePost::new(post, actor, &community, kind, context).await?;
     let id = create_or_update.id.clone();
     let activity = AnnouncableActivities::CreateOrUpdatePost(create_or_update);
diff --git a/crates/apub/src/activity_lists.rs b/crates/apub/src/activity_lists.rs
index 98736ae2..00d2d439 100644
--- a/crates/apub/src/activity_lists.rs
+++ b/crates/apub/src/activity_lists.rs
@@ -1,29 +1,32 @@
 use crate::{
   activities::community::announce::GetCommunity,
   objects::community::ApubCommunity,
-  protocol::activities::{
-    community::{
-      add_mod::AddMod,
-      announce::AnnounceActivity,
-      block_user::BlockUserFromCommunity,
-      remove_mod::RemoveMod,
-      report::Report,
-      undo_block_user::UndoBlockUserFromCommunity,
-      update::UpdateCommunity,
+  protocol::{
+    activities::{
+      community::{
+        add_mod::AddMod,
+        announce::AnnounceActivity,
+        block_user::BlockUserFromCommunity,
+        remove_mod::RemoveMod,
+        report::Report,
+        undo_block_user::UndoBlockUserFromCommunity,
+        update::UpdateCommunity,
+      },
+      create_or_update::{comment::CreateOrUpdateComment, post::CreateOrUpdatePost},
+      deletion::{delete::Delete, undo_delete::UndoDelete},
+      following::{
+        accept::AcceptFollowCommunity,
+        follow::FollowCommunity,
+        undo_follow::UndoFollowCommunity,
+      },
+      private_message::{
+        create_or_update::CreateOrUpdatePrivateMessage,
+        delete::DeletePrivateMessage,
+        undo_delete::UndoDeletePrivateMessage,
+      },
+      voting::{undo_vote::UndoVote, vote::Vote},
     },
-    create_or_update::{comment::CreateOrUpdateComment, post::CreateOrUpdatePost},
-    deletion::{delete::Delete, undo_delete::UndoDelete},
-    following::{
-      accept::AcceptFollowCommunity,
-      follow::FollowCommunity,
-      undo_follow::UndoFollowCommunity,
-    },
-    private_message::{
-      create_or_update::CreateOrUpdatePrivateMessage,
-      delete::DeletePrivateMessage,
-      undo_delete::UndoDeletePrivateMessage,
-    },
-    voting::{undo_vote::UndoVote, vote::Vote},
+    objects::{note::Note, page::Page},
   },
 };
 use lemmy_apub_lib::traits::ActivityHandler;
@@ -79,6 +82,10 @@ pub enum AnnouncableActivities {
   UndoBlockUserFromCommunity(UndoBlockUserFromCommunity),
   AddMod(AddMod),
   RemoveMod(RemoveMod),
+  // For compatibility with Pleroma/Mastodon (send only)
+  Page(Page),
+  // For compatibility with Pleroma/Mastodon (send only)
+  Note(Note),
 }
 
 #[async_trait::async_trait(?Send)]
@@ -101,6 +108,8 @@ impl GetCommunity for AnnouncableActivities {
       UndoBlockUserFromCommunity(a) => a.get_community(context, request_counter).await?,
       AddMod(a) => a.get_community(context, request_counter).await?,
       RemoveMod(a) => a.get_community(context, request_counter).await?,
+      Page(_) => unimplemented!(),
+      Note(_) => unimplemented!(),
     };
     Ok(community)
   }
diff --git a/crates/apub/src/http/community.rs b/crates/apub/src/http/community.rs
index 1854da98..330de0b8 100644
--- a/crates/apub/src/http/community.rs
+++ b/crates/apub/src/http/community.rs
@@ -79,7 +79,7 @@ pub(in crate::http) async fn receive_group_inbox(
   context: &LemmyContext,
 ) -> Result<HttpResponse, LemmyError> {
   let actor_id = ObjectId::new(activity_data.actor.clone());
-  let res = receive_activity(request, activity.clone(), activity_data, context).await;
+  let res = receive_activity(request, activity.clone(), activity_data, context).await?;
 
   if let GroupInboxActivities::AnnouncableActivities(announcable) = activity {
     let community = announcable.get_community(context, &mut 0).await?;
@@ -89,7 +89,7 @@ pub(in crate::http) async fn receive_group_inbox(
     }
   }
 
-  res
+  Ok(res)
 }
 
 /// Returns an empty followers collection, only populating the size (for privacy).
diff --git a/crates/apub/src/http/mod.rs b/crates/apub/src/http/mod.rs
index 0fd8de8b..d35815ab 100644
--- a/crates/apub/src/http/mod.rs
+++ b/crates/apub/src/http/mod.rs
@@ -109,14 +109,7 @@ where
 
   // Log the activity, so we avoid receiving and parsing it twice. Note that this could still happen
   // if we receive the same activity twice in very quick succession.
-  insert_activity(
-    &activity_data.id,
-    activity.clone(),
-    false,
-    true,
-    context.pool(),
-  )
-  .await?;
+  insert_activity(&activity_data.id, &activity, false, true, context.pool()).await?;
 
   info!("Receiving activity {}", activity_data.id.to_string());
   activity
diff --git a/crates/apub/src/lib.rs b/crates/apub/src/lib.rs
index 75d7a62f..74dfd952 100644
--- a/crates/apub/src/lib.rs
+++ b/crates/apub/src/lib.rs
@@ -179,7 +179,7 @@ pub async fn get_actor_id_from_name(
 /// persistent.
 async fn insert_activity<T>(
   ap_id: &Url,
-  activity: T,
+  activity: &T,
   local: bool,
   sensitive: bool,
   pool: &DbPool,
@@ -187,9 +187,10 @@ async fn insert_activity<T>(
 where
   T: Serialize + std::fmt::Debug + Send + 'static,
 {
+  let data = serde_json::to_value(activity)?;
   let ap_id = ap_id.to_owned().into();
   blocking(pool, move |conn| {
-    Activity::insert(conn, ap_id, &activity, local, sensitive)
+    Activity::insert(conn, ap_id, data, local, sensitive)
   })
   .await??;
   Ok(())
diff --git a/crates/apub/src/protocol/objects/note.rs b/crates/apub/src/protocol/objects/note.rs
index 6d582b34..784e6f9f 100644
--- a/crates/apub/src/protocol/objects/note.rs
+++ b/crates/apub/src/protocol/objects/note.rs
@@ -4,9 +4,15 @@ use crate::{
   protocol::Source,
 };
 use activitystreams::{object::kind::NoteType, unparsed::Unparsed};
+use anyhow::anyhow;
 use chrono::{DateTime, FixedOffset};
 use lemmy_api_common::blocking;
-use lemmy_apub_lib::{object_id::ObjectId, values::MediaTypeHtml};
+use lemmy_apub_lib::{
+  data::Data,
+  object_id::ObjectId,
+  traits::ActivityHandler,
+  values::MediaTypeHtml,
+};
 use lemmy_db_schema::{newtypes::CommentId, source::post::Post, traits::Crud};
 use lemmy_utils::LemmyError;
 use lemmy_websocket::LemmyContext;
@@ -81,3 +87,15 @@ impl Note {
     }
   }
 }
+
+// For Pleroma/Mastodon compat. Unimplemented because its only used for sending.
+#[async_trait::async_trait(?Send)]
+impl ActivityHandler for Note {
+  type DataType = LemmyContext;
+  async fn verify(&self, _: &Data<Self::DataType>, _: &mut i32) -> Result<(), LemmyError> {
+    Err(anyhow!("Announce/Page can only be sent, not received").into())
+  }
+  async fn receive(self, _: &Data<Self::DataType>, _: &mut i32) -> Result<(), LemmyError> {
+    unimplemented!()
+  }
+}
diff --git a/crates/apub/src/protocol/objects/page.rs b/crates/apub/src/protocol/objects/page.rs
index 89fb1141..dbf52eee 100644
--- a/crates/apub/src/protocol/objects/page.rs
+++ b/crates/apub/src/protocol/objects/page.rs
@@ -5,7 +5,12 @@ use crate::{
 use activitystreams::{object::kind::PageType, unparsed::Unparsed};
 use anyhow::anyhow;
 use chrono::{DateTime, FixedOffset};
-use lemmy_apub_lib::{object_id::ObjectId, values::MediaTypeHtml};
+use lemmy_apub_lib::{
+  data::Data,
+  object_id::ObjectId,
+  traits::ActivityHandler,
+  values::MediaTypeHtml,
+};
 use lemmy_utils::LemmyError;
 use lemmy_websocket::LemmyContext;
 use serde::{Deserialize, Serialize};
@@ -73,3 +78,15 @@ impl Page {
     }
   }
 }
+
+// For Pleroma/Mastodon compat. Unimplemented because its only used for sending.
+#[async_trait::async_trait(?Send)]
+impl ActivityHandler for Page {
+  type DataType = LemmyContext;
+  async fn verify(&self, _: &Data<Self::DataType>, _: &mut i32) -> Result<(), LemmyError> {
+    Err(anyhow!("Announce/Page can only be sent, not received").into())
+  }
+  async fn receive(self, _: &Data<Self::DataType>, _: &mut i32) -> Result<(), LemmyError> {
+    unimplemented!()
+  }
+}
diff --git a/crates/apub_lib/src/activity_queue.rs b/crates/apub_lib/src/activity_queue.rs
index 7efa54ef..fe28d870 100644
--- a/crates/apub_lib/src/activity_queue.rs
+++ b/crates/apub_lib/src/activity_queue.rs
@@ -1,4 +1,4 @@
-use crate::{signatures::sign_and_send, traits::ActorType, APUB_JSON_CONTENT_TYPE};
+use crate::{signatures::sign_and_send, traits::ActorType};
 use anyhow::{anyhow, Context, Error};
 use background_jobs::{
   create_server,
@@ -13,7 +13,7 @@ use lemmy_utils::{location_info, LemmyError};
 use log::warn;
 use reqwest::Client;
 use serde::{Deserialize, Serialize};
-use std::{collections::BTreeMap, env, fmt::Debug, future::Future, pin::Pin};
+use std::{env, fmt::Debug, future::Future, pin::Pin};
 use url::Url;
 
 pub async fn send_activity(
@@ -64,11 +64,8 @@ impl ActixJob for SendActivityTask {
 }
 
 async fn do_send(task: SendActivityTask, client: &Client) -> Result<(), Error> {
-  let mut headers = BTreeMap::<String, String>::new();
-  headers.insert("Content-Type".into(), APUB_JSON_CONTENT_TYPE.to_string());
   let result = sign_and_send(
     client,
-    headers,
     &task.inbox,
     task.activity.clone(),
     &task.actor_id,
diff --git a/crates/apub_lib/src/signatures.rs b/crates/apub_lib/src/signatures.rs
index ccc72081..3329b681 100644
--- a/crates/apub_lib/src/signatures.rs
+++ b/crates/apub_lib/src/signatures.rs
@@ -1,3 +1,5 @@
+use crate::APUB_JSON_CONTENT_TYPE;
+use activitystreams::chrono::Utc;
 use actix_web::HttpRequest;
 use anyhow::anyhow;
 use http::{header::HeaderName, HeaderMap, HeaderValue};
@@ -13,19 +15,18 @@ use openssl::{
 use reqwest::{Client, Response};
 use serde::{Deserialize, Serialize};
 use sha2::{Digest, Sha256};
-use std::{collections::BTreeMap, str::FromStr};
+use std::str::FromStr;
 use url::Url;
 
 lazy_static! {
   static ref CONFIG2: ConfigActix = ConfigActix::new();
-  static ref HTTP_SIG_CONFIG: Config = Config::new();
+  static ref HTTP_SIG_CONFIG: Config = Config::new().mastodon_compat();
 }
 
 /// Creates an HTTP post request to `inbox_url`, with the given `client` and `headers`, and
 /// `activity` as request body. The request is signed with `private_key` and then sent.
 pub async fn sign_and_send(
   client: &Client,
-  headers: BTreeMap<String, String>,
   inbox_url: &Url,
   activity: String,
   actor_id: &Url,
@@ -33,16 +34,24 @@ pub async fn sign_and_send(
 ) -> Result<Response, LemmyError> {
   let signing_key_id = format!("{}#main-key", actor_id);
 
-  let mut header_map = HeaderMap::new();
-  for h in headers {
-    header_map.insert(
-      HeaderName::from_str(h.0.as_str())?,
-      HeaderValue::from_str(h.1.as_str())?,
-    );
+  let mut headers = HeaderMap::new();
+  let mut host = inbox_url.domain().expect("read inbox domain").to_string();
+  if let Some(port) = inbox_url.port() {
+    host = format!("{}:{}", host, port);
   }
+  headers.insert(
+    HeaderName::from_str("Content-Type")?,
+    HeaderValue::from_str(APUB_JSON_CONTENT_TYPE)?,
+  );
+  headers.insert(HeaderName::from_str("Host")?, HeaderValue::from_str(&host)?);
+  headers.insert(
+    HeaderName::from_str("Date")?,
+    HeaderValue::from_str(&Utc::now().to_rfc2822())?,
+  );
+
   let response = client
     .post(&inbox_url.to_string())
-    .headers(header_map)
+    .headers(headers)
     .signature_with_digest(
       HTTP_SIG_CONFIG.clone(),
       signing_key_id,
diff --git a/crates/db_schema/src/impls/activity.rs b/crates/db_schema/src/impls/activity.rs
index 5efb3b23..5ec5d49d 100644
--- a/crates/db_schema/src/impls/activity.rs
+++ b/crates/db_schema/src/impls/activity.rs
@@ -1,10 +1,7 @@
 use crate::{newtypes::DbUrl, source::activity::*, traits::Crud};
 use diesel::{dsl::*, result::Error, *};
-use serde::Serialize;
-use std::{
-  fmt::Debug,
-  io::{Error as IoError, ErrorKind},
-};
+use serde_json::Value;
+use std::io::{Error as IoError, ErrorKind};
 
 impl Crud for Activity {
   type Form = ActivityForm;
@@ -38,19 +35,16 @@ impl Crud for Activity {
 }
 
 impl Activity {
-  pub fn insert<T>(
+  pub fn insert(
     conn: &PgConnection,
     ap_id: DbUrl,
-    data: &T,
+    data: Value,
     local: bool,
     sensitive: bool,
-  ) -> Result<Activity, IoError>
-  where
-    T: Serialize + Debug,
-  {
+  ) -> Result<Activity, IoError> {
     let activity_form = ActivityForm {
       ap_id,
-      data: serde_json::to_value(&data)?,
+      data,
       local: Some(local),
       sensitive,
       updated: None,