From c036a26ea266f3235a6660f6314389b416879a4b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=97=8D+85CD?= <50108258+kwaa@users.noreply.github.com>
Date: Mon, 19 Feb 2024 23:32:39 +0800
Subject: [PATCH] feat: implement fep-4adb (#15)

---
 FEDERATION.md                     |  1 +
 crates/api_apub/src/users/user.rs | 22 ++++++++++++++++++++--
 crates/apub/src/actors/db_user.rs |  6 +++++-
 crates/apub/src/actors/service.rs |  4 ++++
 docs/src/others/federation.md     |  1 +
 5 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/FEDERATION.md b/FEDERATION.md
index 77d08daa..5118d36f 100644
--- a/FEDERATION.md
+++ b/FEDERATION.md
@@ -13,6 +13,7 @@
 - [FEP-67ff: FEDERATION.md](https://codeberg.org/fediverse/fep/src/branch/main/fep/67ff/fep-67ff.md)
 - [FEP-f1d5: NodeInfo in Fediverse Software](https://codeberg.org/fediverse/fep/src/branch/main/fep/f1d5/fep-f1d5.md)
 - [FEP-fffd: Proxy Objects](https://codeberg.org/fediverse/fep/src/branch/main/fep/fffd/fep-fffd.md)
+- [FEP-4adb: Dereferencing identifiers with webfinger](https://codeberg.org/fediverse/fep/src/branch/main/fep/4adb/fep-4adb.md)
 
 ## ActivityPub
 
diff --git a/crates/api_apub/src/users/user.rs b/crates/api_apub/src/users/user.rs
index c7e14ec0..63767e5d 100644
--- a/crates/api_apub/src/users/user.rs
+++ b/crates/api_apub/src/users/user.rs
@@ -16,7 +16,7 @@ use hatsu_db_schema::prelude::User;
 use hatsu_utils::{AppData, AppError};
 use sea_orm::EntityTrait;
 // use serde::Deserialize;
-use serde_json::Value;
+use serde_json::{json, Value};
 
 // #[derive(TypedPath, Deserialize)]
 // #[typed_path("/u/:name")]
@@ -52,11 +52,29 @@ pub async fn user(
     let url = hatsu_utils::url::generate_user_url(data.domain(), &name)?;
     // "@context": [
     //   "https://www.w3.org/ns/activitystreams",
-    //   "https://w3id.org/security/v1"
+    //   "https://w3id.org/security/v1",
+    //   {
+    //     "xrd": "http://docs.oasis-open.org/ns/xri/xrd-1.0#",
+    //     "aliases": {
+    //       "@id": "xrd:Alias",
+    //       "@type": "@id",
+    //       "@container": "@list"
+    //     }
+    //   }
     // ]
     let context = vec![
         Value::String(context().to_string()),
         Value::String(security().to_string()),
+        // FEP-4adb
+        // https://github.com/importantimport/hatsu/issues/15
+        json!({
+            "xrd": "http://docs.oasis-open.org/ns/xri/xrd-1.0#",
+            "aliases": {
+              "@id": "xrd:Alias",
+              "@type": "@id",
+              "@container": "@list"
+            },
+        })
     ];
 
     match User::find_by_id(&url.to_string()).one(&data.conn).await? {
diff --git a/crates/apub/src/actors/db_user.rs b/crates/apub/src/actors/db_user.rs
index 9a4a827c..eaff1fbd 100644
--- a/crates/apub/src/actors/db_user.rs
+++ b/crates/apub/src/actors/db_user.rs
@@ -112,7 +112,7 @@ impl Object for ApubUser {
         Ok(user.into())
     }
 
-    async fn into_json(self, _data: &Data<Self::DataType>) -> Result<Self::Kind, Self::Error> {
+    async fn into_json(self, data: &Data<Self::DataType>) -> Result<Self::Kind, Self::Error> {
         Ok(Service {
             kind: ServiceType::Service.to_string(),
             name: self.name.clone(),
@@ -133,6 +133,10 @@ impl Object for ApubUser {
             outbox: Url::parse(&self.outbox)?,
             followers: Url::parse(&self.followers)?,
             following: Url::parse(&self.following)?,
+            // FEP-4adb
+            // https://github.com/importantimport/hatsu/issues/15
+            // TODO: customize via _hatsu.aliases
+            aliases: Some(vec![format!("acct:{}@{}", &self.preferred_username, &self.preferred_username), format!("acct:{}@{}", &self.preferred_username, data.domain())]),
             public_key: self.public_key(),
         })
     }
diff --git a/crates/apub/src/actors/service.rs b/crates/apub/src/actors/service.rs
index adff4b0f..7d071340 100644
--- a/crates/apub/src/actors/service.rs
+++ b/crates/apub/src/actors/service.rs
@@ -48,6 +48,10 @@ pub struct Service {
     pub followers: Url,
     // 正在关注
     pub following: Url,
+    /// FEP-4adb
+    /// https://github.com/importantimport/hatsu/issues/15
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub aliases: Option<Vec<String>>,
     // 公钥
     #[schema(value_type = PublicKeySchema)]
     pub public_key: PublicKey,
diff --git a/docs/src/others/federation.md b/docs/src/others/federation.md
index 77d08daa..5118d36f 100644
--- a/docs/src/others/federation.md
+++ b/docs/src/others/federation.md
@@ -13,6 +13,7 @@
 - [FEP-67ff: FEDERATION.md](https://codeberg.org/fediverse/fep/src/branch/main/fep/67ff/fep-67ff.md)
 - [FEP-f1d5: NodeInfo in Fediverse Software](https://codeberg.org/fediverse/fep/src/branch/main/fep/f1d5/fep-f1d5.md)
 - [FEP-fffd: Proxy Objects](https://codeberg.org/fediverse/fep/src/branch/main/fep/fffd/fep-fffd.md)
+- [FEP-4adb: Dereferencing identifiers with webfinger](https://codeberg.org/fediverse/fep/src/branch/main/fep/4adb/fep-4adb.md)
 
 ## ActivityPub