Implement remote follow (#3738)

* Add remote follow url to webfinger response

* update apub lib

Cargo.lock

@@ -10,9 +10,9 @@ checksum = "fe438c63458706e03479442743baae6c88256498e6431708f6dfc520a26515d3"
 
 [[package]]
 name = "activitypub_federation"
-version = "0.5.0-beta.1"
+version = "0.5.0-beta.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fb4c5f0e97215be7fb8bdd632283f66d78168f388029d678ab4854ff599f0238"
+checksum = "8210e0ac4675753f9288c1102fb4940b22e5868308383c286b07eb63f3ff4c65"
 dependencies = [
  "activitystreams-kinds",
  "actix-web",

Cargo.toml

@@ -67,7 +67,7 @@ lemmy_routes = { version = "=0.18.1", path = "./crates/routes" }
 lemmy_db_views = { version = "=0.18.1", path = "./crates/db_views" }
 lemmy_db_views_actor = { version = "=0.18.1", path = "./crates/db_views_actor" }
 lemmy_db_views_moderator = { version = "=0.18.1", path = "./crates/db_views_moderator" }
-activitypub_federation = { version = "0.5.0-beta.1", default-features = false, features = [
+activitypub_federation = { version = "0.5.0-beta.2", default-features = false, features = [
   "actix-web",
 ] }
 diesel = "2.1.0"

crates/routes/src/webfinger.rs

@@ -50,8 +50,8 @@ async fn get_webfinger_response(
   // Mastodon seems to prioritize the last webfinger item in case of duplicates. Put
   // community last so that it gets prioritized. For Lemmy the order doesnt matter.
   let links = vec![
-    webfinger_link_for_actor(user_id, "Person"),
-    webfinger_link_for_actor(community_id, "Group"),
+    webfinger_link_for_actor(user_id, "Person", &context),
+    webfinger_link_for_actor(community_id, "Group", &context),
   ]
   .into_iter()
   .flatten()
@@ -66,29 +66,45 @@ async fn get_webfinger_response(
   Ok(HttpResponse::Ok().json(json))
 }
 
-fn webfinger_link_for_actor(url: Option<Url>, kind: &str) -> Vec<WebfingerLink> {
+fn webfinger_link_for_actor(
+  url: Option<Url>,
+  kind: &str,
+  context: &LemmyContext,
+) -> Vec<WebfingerLink> {
   if let Some(url) = url {
-    let mut properties = HashMap::new();
-    properties.insert(
-      "https://www.w3.org/ns/activitystreams#type"
-        .parse()
-        .expect("parse url"),
-      kind.to_string(),
-    );
-    vec![
+    let type_key = "https://www.w3.org/ns/activitystreams#type"
+      .parse()
+      .expect("parse url");
+
+    let mut vec = vec![
       WebfingerLink {
-        rel: Some("http://webfinger.net/rel/profile-page".to_string()),
-        kind: Some("text/html".to_string()),
+        rel: Some("http://webfinger.net/rel/profile-page".into()),
+        kind: Some("text/html".into()),
         href: Some(url.clone()),
         ..Default::default()
       },
       WebfingerLink {
-        rel: Some("self".to_string()),
-        kind: Some("application/activity+json".to_string()),
+        rel: Some("self".into()),
+        kind: Some("application/activity+json".into()),
         href: Some(url),
-        properties,
+        properties: HashMap::from([(type_key, kind.into())]),
+        ..Default::default()
       },
-    ]
+    ];
+
+    // insert remote follow link
+    if kind == "Person" {
+      let template = format!(
+        "{}/activitypub/externalInteraction?uri={{uri}}",
+        context.settings().get_protocol_and_hostname()
+      );
+      vec.push(WebfingerLink {
+        rel: Some("http://ostatus.org/schema/1.0/subscribe".into()),
+        template: Some(template),
+        ..Default::default()
+      });
+    }
+    vec
   } else {
     vec![]
   }

crates/utils/translations

@@ -1 +1 @@
-Subproject commit 1c42c579460871de7b4ea18e58dc25543b80d289
+Subproject commit 713ceed9c7ef84deaa222e68361e670e0763cd83