Make sure we select region properly (#754)

* make sure we select region properly

* Adding changelog

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 ## NOT RELEASED
 
+## 1.4.1
+
+### Fixed
+
+- Make sure passing `@region` to an API operation has effect.
+- Check that both AWS access id and secret exists before using them.
+
 ## 1.4.0
 
 ### Added

src/AbstractApi.php

@@ -192,7 +192,7 @@ protected function getEndpointMetadata(?string $region): array
     protected function getEndpoint(string $uri, array $query, ?string $region): string
     {
         /** @var string $region */
-        $region = $region ?? $this->configuration->isDefault('region') ? null : $this->configuration->get('region');
+        $region = $region ?? ($this->configuration->isDefault('region') ? null : $this->configuration->get('region'));
         if (!$this->configuration->isDefault('endpoint')) {
             /** @var string $endpoint */
             $endpoint = $this->configuration->get('endpoint');

tests/Unit/AbstractApiTest.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace AsyncAws\Core\Tests\Unit;
+
+use AsyncAws\Core\AbstractApi;
+use AsyncAws\Core\Configuration;
+use PHPUnit\Framework\TestCase;
+
+class AbstractApiTest extends TestCase
+{
+    public function testGetEndpointRegion()
+    {
+        $api = new DummyApi();
+
+        // Use default region
+        $endpoint = $api->getEndpoint('/some/path', [], null);
+        self::assertEquals('https://foobar.us-east-1.amazonaws.com/some/path', $endpoint);
+
+        $endpoint = $api->getEndpoint('/some/path', [], 'eu-central-1');
+        self::assertEquals('https://foobar.eu-central-1.amazonaws.com/some/path', $endpoint);
+
+        // Use region from config
+        $api = new DummyApi(['region' => 'eu-north-1']);
+        $endpoint = $api->getEndpoint('/some/path', [], null);
+        self::assertEquals('https://foobar.eu-north-1.amazonaws.com/some/path', $endpoint);
+
+        $endpoint = $api->getEndpoint('/some/path', [], 'eu-central-1');
+        self::assertEquals('https://foobar.eu-central-1.amazonaws.com/some/path', $endpoint);
+    }
+}
+
+class DummyApi extends AbstractApi
+{
+    public function getEndpoint(string $uri, array $query, ?string $region): string
+    {
+        return parent::getEndpoint($uri, $query, $region);
+    }
+
+    protected function getEndpointMetadata(?string $region): array
+    {
+        if (null === $region) {
+            $region = Configuration::DEFAULT_REGION;
+        }
+
+        return [
+            'endpoint' => "https://foobar.$region.amazonaws.com",
+            'signRegion' => $region,
+            'signService' => 'foobar',
+            'signVersions' => ['v4'],
+        ];
+    }
+}