Add ability to get the user for an invite code in collab API

Co-Authored-By: Antonio Scandurra <me@as-cii.com>

crates/collab/src/api.rs

@@ -26,6 +26,7 @@ pub fn routes(state: Arc<AppState>) -> Router<Body> {
             put(update_user).delete(destroy_user).get(get_user),
         )
         .route("/users/:id/access_tokens", post(create_access_token))
+        .route("/invite_codes/:code", get(get_user_for_invite_code))
         .route("/panic", post(trace_panic))
         .layer(
             ServiceBuilder::new()
@@ -210,3 +211,10 @@ async fn create_access_token(
         encrypted_access_token,
     }))
 }
+
+async fn get_user_for_invite_code(
+    Path(code): Path<String>,
+    Extension(app): Extension<Arc<AppState>>,
+) -> Result<Json<User>> {
+    Ok(Json(app.db.get_user_for_invite_code(&code).await?))
+}