allow LoginCtx to handle anonymous users

api/user.go

@@ -32,28 +32,29 @@ func UserCtx(next http.Handler) http.Handler {
 
 func Whoami(w http.ResponseWriter, r *http.Request) {
 	user, ok := r.Context().Value(userKey{}).(*User)
-	if !ok {
-		w.Write([]byte("undefined"))
-		return
-	} else {
-		w.Write([]byte(user.Name))
+	if !ok || user == nil {
+		// Anonymous user
+		w.Write([]byte("anonymous"))
 		return
 	}
+
+	w.Write([]byte(user.Name))
 }
 
 func LoginCtx(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		var user *User
-		var err error
-
-		if username := r.Context().Value(usernameKey).(string); username != "" {
-			user, err = dbGetUserByName(username)
-		} else {
-			render.Render(w, r, ErrNotFound)
+		// Try to retrieve username from context
+		username, ok := r.Context().Value(usernameKey).(string)
+		if !ok || username == "" {
+			// No username provided, assume it's an anonymous user
+			next.ServeHTTP(w, r)
 			return
 		}
 
+		// Lookup user in the database
+		user, err := dbGetUserByName(username)
 		if err != nil {
+			// If user is specified and not found, throw an error
 			render.Render(w, r, ErrNotFound)
 			return
 		}