Fix idempotency response should return an Error object

MangoPay/ApiResponses.php

@@ -16,12 +16,20 @@ class ApiResponses extends Libraries\ApiBase
     public function Get($idempotencyKey)
     {
         $response = $this->GetObject('responses_get', 'MangoPay\Response', $idempotencyKey);
-        $className = $this->GetObjectForIdempotencyUrl($response->RequestURL);
-        if (is_null($className) || empty($className) || is_null($response->Resource) || empty($response->Resource)) {
+
+        // Same logic as RestTool::CheckResponseCode
+        if ($response->StatusCode >= 200 && $response->StatusCode <= 299) {
+            // Target the class to use from the SDK
+            $className = $this->GetObjectForIdempotencyUrl($response->RequestURL);
+            if (is_null($className) || empty($className) || is_null($response->Resource) || empty($response->Resource)) {
+                return $response;
+            }
+
+            $response->Resource = $this->CastResponseToEntity($response->Resource, $className);
             return $response;
         }
 
-        $response->Resource = $this->CastResponseToEntity($response->Resource, $className);
+        $response->Resource = $this->CastResponseToError($response->Resource);
         return $response;
     }
 }

MangoPay/Libraries/ApiBase.php

@@ -430,6 +430,41 @@ protected function ExecutePostRequest($methodKey, $entity, $responseClassName, $
         return $response;
     }
 
+    /**
+     * Cast response object to an error object
+     * @param object $response Object from API response
+     * @return Error The error
+     */
+    protected function CastResponseToError($response)
+    {
+        // This logic is similar to RestTool::CheckResponseCode
+        $error = new Error();
+
+        $map = [
+            'Message',
+            'Id',
+            'Type',
+            'Date',
+            'Errors',
+        ];
+
+        foreach ($map as $val) {
+            $error->{$val} = property_exists($response, $val) ? $response->{$val} : null;
+        }
+
+        if (property_exists($response, 'errors')) {
+            $error->Errors = $response->errors;
+        }
+
+        if (is_array($error->Errors)) {
+            foreach ($error->Errors as $key => $val) {
+                $error->Message .= sprintf(' %s error: %s', $key, $val);
+            }
+        }
+
+        return $error;
+    }
+
     /**
      * Cast response object to entity object
      * @param object $response Object from API response

tests/Cases/IdempotencyTest.php

@@ -52,6 +52,24 @@ public function test_DifferentIdempotencyKey_ActIndependentlyAndRetreivable()
         $this->assertTrue($resp2->Resource->Id == $user2->Id);
     }
 
+    public function test_SameIdempotencyKey_ErrorAndGetBackError()
+    {
+        $idempotencyKey = md5(uniqid());
+        $user = $this->buildJohn();
+        $user->FirstName = null;// Trigger an error: The FirstName field is required
+        try {
+            $user1 = $this->_api->Users->Create($user, $idempotencyKey);
+        } catch (ResponseException $exception) {
+            // Check it is what we expect
+            self::assertStringContainsString('The FirstName field is required', $exception->GetErrorDetails()->Errors->FirstName);
+        }
+        // Use case: the user lost the above exception and wants to get it back
+        $response = $this->_api->Responses->Get($idempotencyKey);
+        self::assertInstanceOf('MangoPay\Response', $response);
+        self::assertInstanceOf('MangoPay\Libraries\Error', $response->Resource);
+        self::assertStringContainsString('The FirstName field is required', $response->Resource->Errors->FirstName);
+    }
+
     public function test_GetIdempotencyKey_PreauthorizationCreate()
     {
         $key = md5(uniqid());