Add /api/v1/accounts/lookup Mastodon API endpoint

CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+### Added
+
+- Added `/api/v1/accounts/lookup` Mastodon API endpoint.
+
 ### Changed
 
 - Updated installation instructions, default mitra config and recommended nginx config.

docs/openapi.yaml

@@ -345,6 +345,25 @@ paths:
                 type: array
                 items:
                   $ref: '#/components/schemas/Relationship'
+  /api/v1/accounts/lookup:
+    get:
+      summary: Lookup webfinger address.
+      parameters:
+        - name: acct
+          in: query
+          description: The username or Webfinger address to lookup.
+          required: true
+          schema:
+            type: string
+      responses:
+        200:
+          description: Successful operation
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Account'
+        404:
+          description: Profile not found
   /api/v1/accounts/search:
     get:
       summary: Search for matching profiles by username.

src/mastodon_api/accounts/types.rs

@@ -379,6 +379,11 @@ impl Default for RelationshipMap {
     }
 }
 
+#[derive(Deserialize)]
+pub struct LookupAcctQueryParams {
+    pub acct: String,
+}
+
 fn default_search_page_size() -> PageSize { PageSize::new(40) }
 
 #[derive(Deserialize)]

src/mastodon_api/accounts/views.rs

@@ -105,6 +105,7 @@ use super::types::{
     IdentityClaim,
     IdentityClaimQueryParams,
     IdentityProofData,
+    LookupAcctQueryParams,
     MoveFollowersRequest,
     RelationshipQueryParams,
     SearchAcctQueryParams,
@@ -552,6 +553,18 @@ async fn get_relationships_view(
     Ok(HttpResponse::Ok().json(vec![relationship]))
 }
 
+#[get("/lookup")]
+async fn lookup_acct(
+    config: web::Data<Config>,
+    db_pool: web::Data<DbPool>,
+    query_params: web::Query<LookupAcctQueryParams>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    let profile = get_profile_by_acct(db_client, &query_params.acct).await?;
+    let account = Account::from_profile(profile, &config.instance_url());
+    Ok(HttpResponse::Ok().json(account))
+}
+
 #[get("/search")]
 async fn search_by_acct(
     config: web::Data<Config>,
@@ -839,6 +852,7 @@ pub fn account_api_scope() -> Scope {
         .service(get_identity_claim)
         .service(create_identity_proof)
         .service(get_relationships_view)
+        .service(lookup_acct)
         .service(search_by_acct)
         .service(search_by_did)
         // Routes with account ID

src/mastodon_api/mod.rs

@@ -13,5 +13,5 @@ pub mod subscriptions;
 pub mod timelines;
 mod uploads;
 
-const MASTODON_API_VERSION: &str = "3.0.0";
+const MASTODON_API_VERSION: &str = "4.0.0";
 pub use uploads::UPLOAD_MAX_SIZE;