Allow using dot separated field names for Identity::get()

composer.json

@@ -25,6 +25,7 @@
     "require": {
         "php": ">=8.1",
         "cakephp/http": "^5.0",
+        "cakephp/utility": "^5.0",
         "laminas/laminas-diactoros": "^3.0",
         "psr/http-client": "^1.0",
         "psr/http-message": "^1.1 || ^2.0",

src/Identity.php

@@ -19,6 +19,7 @@
 use ArrayAccess;
 use BadMethodCallException;
 use Cake\Core\InstanceConfigTrait;
+use Cake\Utility\Hash;
 
 /**
  * Identity object
@@ -90,23 +91,27 @@ public function __isset(string $field): bool
     }
 
     /**
-     * Get data from the identity
+     * Get data from the identity.
      *
-     * @param string $field Field in the user data.
+     * You can use dot notation to fetch nested data.
+     * Calling the method without any argument will return
+     * the entire data array/object (same as `getOriginalData()`).
+     *
+     * @param string|null $field Field in the user data.
      * @return mixed
      */
-    public function get(string $field): mixed
+    public function get(?string $field = null): mixed
     {
+        if ($field === null) {
+            return $this->data;
+        }
+
         $map = $this->_config['fieldMap'];
         if (isset($map[$field])) {
             $field = $map[$field];
         }
 
-        if (isset($this->data[$field])) {
-            return $this->data[$field];
-        }
-
-        return null;
+        return Hash::get($this->data, $field);
     }
 
     /**

tests/TestCase/IdentityTest.php

@@ -19,6 +19,7 @@
 use ArrayObject;
 use Authentication\Identity;
 use BadMethodCallException;
+use Cake\ORM\Entity;
 use Cake\TestSuite\TestCase;
 
 class IdentityTest extends TestCase
@@ -43,6 +44,23 @@ public function testGetIdentifier()
         $this->assertSame('florian', $identity->username);
     }
 
+    public function testGet(): void
+    {
+        $data = new Entity([
+            'id' => 1,
+            'username' => 'florian',
+            'account' => new Entity(['id' => 2, 'role' => 'admin']),
+        ]);
+
+        $identity = new Identity($data);
+
+        $this->assertSame(1, $identity->get('id'));
+        $this->assertSame('florian', $identity->get('username'));
+        $this->assertSame('admin', $identity->get('account.role'));
+        $this->assertNull($identity->get('missing'));
+        $this->assertSame($data, $identity->get());
+    }
+
     /**
      * Test mapping fields
      *