Simplify Crendential generation (#190)

Author: jderusse

AbstractApi.php

@@ -67,18 +67,11 @@ public function __construct($configuration = [], ?CredentialProvider $credential
         $this->httpClient = $httpClient ?? HttpClient::create();
         $this->logger = $logger ?? new NullLogger();
         $this->configuration = $configuration;
-        if ($configuration->isDefault(Configuration::OPTION_ENDPOINT)) {
-            $this->credentialProvider = $credentialProvider ?? new CacheProvider(new ChainProvider([
-                new ConfigurationProvider(),
-                new IniFileProvider($this->logger),
-                new InstanceProvider($this->httpClient, $this->logger),
-            ]));
-        } else {
-            $this->credentialProvider = $credentialProvider ?? new CacheProvider(new ChainProvider([
-                new ConfigurationProvider(),
-                new IniFileProvider($this->logger),
-            ]));
-        }
+        $this->credentialProvider = $credentialProvider ?? new CacheProvider(new ChainProvider([
+            new ConfigurationProvider(),
+            new IniFileProvider($this->logger),
+            new InstanceProvider($this->httpClient, $this->logger),
+        ]));
     }
 
     /**

Credentials/NullProvider.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace AsyncAws\Core\Credentials;
+
+use AsyncAws\Core\Configuration;
+
+/**
+ * Returns null.
+ *
+ * @author Jérémy Derussé <[email protected]>
+ */
+class NullProvider implements CredentialProvider
+{
+    public function getCredentials(Configuration $configuration): ?Credentials
+    {
+        return null;
+    }
+}