add a provider read param from environment variables (#253)

Author: yangzong18

samples/CredentialsProvider.php

@@ -4,6 +4,7 @@
 use OSS\OssClient;
 use OSS\Core\OssException;
 use OSS\Credentials\StaticCredentialsProvider;
+use OSS\Credentials\EnvironmentVariableCredentialsProvider;
 $bucket = Common::getBucketName();
 
 // Access Key Provider demo
@@ -43,3 +44,20 @@
     printf($e->getMessage() . "\n");
     return;
 }
+
+// read from env
+$envProvider = new EnvironmentVariableCredentialsProvider();
+$config = array(
+    'provider' => $envProvider,
+    'endpoint'=> "<endpoint>"
+);
+
+try {
+    $ossClient = new OssClient($config);
+    $ossClient->putObject($bucket,'c.file','hi oss,this is credentials test of sts provider');
+    $result = $ossClient->getObject($bucket,'c.file');
+    var_dump($result);
+} catch (OssException $e) {
+    printf($e->getMessage() . "\n");
+    return;
+}

src/OSS/Credentials/EnvironmentVariableCredentialsProvider.php

@@ -0,0 +1,20 @@
+<?php
+namespace OSS\Credentials;
+
+use OSS\Core\OssException;
+
+class EnvironmentVariableCredentialsProvider implements CredentialsProvider
+{
+
+    /**
+     * @return Credentials
+     * @throws OssException
+     */
+    public function getCredentials()
+    {
+        $ak= getenv('OSS_ACCESS_KEY_ID');
+        $sk = getenv('OSS_ACCESS_KEY_SECRET');
+        $token =  getenv('OSS_SESSION_TOKEN');
+        return new Credentials($ak, $sk, $token);
+    }
+}

tests/OSS/Tests/OssClientTest.php

@@ -3,10 +3,12 @@
 namespace OSS\Tests;
 
 use OSS\Core\OssException;
+use OSS\Credentials\EnvironmentVariableCredentialsProvider;
 use OSS\OssClient;
 use OSS\Credentials\Credentials;
 use OSS\Credentials\CredentialsProvider;
 use OSS\Credentials\StaticCredentialsProvider;
+require_once __DIR__ . DIRECTORY_SEPARATOR . 'TestOssClientBase.php';
 
 class TestEmptyIdCredentials extends Credentials
 {
@@ -78,7 +80,6 @@ public function getCredentials()
     }
 }
 
-
 class OssClientTest extends TestOssClientBase
 {
     public function testConstrunct()
@@ -491,4 +492,30 @@ public function testEmptyCredentials()
             $this->assertEquals('access key id is empty', $e->getMessage());
         }
     }
+
+    public function testEnvironmentVariableCredentialsProvider()
+    {
+        try {
+            $provider = new EnvironmentVariableCredentialsProvider();
+            $config = array(
+                'provider' => $provider,
+                'endpoint'=>'oss-cn-hangzhou.aliyuncs.com'
+            );
+            $ossClient = new OssClient($config);
+            $ossClient->putObject($this->bucket,'test_emptybody','');
+            $this->assertTrue(true);
+        } catch (OssException $e) {
+            printf($e->getMessage());
+            $this->assertFalse(true);
+        }
+
+
+        try {
+            $ossClient->getObject($this->bucket,'test_emptybody');
+            $this->assertTrue(true);
+        } catch (OssException $e) {
+            printf($e->getMessage());
+            $this->assertFalse(true);
+        }
+    }
 }