在AWS中自定义Credential Provider实现Client连接

今天在使用AWS中，由于原来的 key和secrect是放在配置文件ini里面的。现在需要改成从DB里面获取，所以需要自定义Credential.在AWS中重写这个挺简单的。

我这里是继承原先的CredentialProvider类，然后写了一个bucketProvider方法

使用方法：

//调用自定义provider
$provider = applibraryAwsS3CredentialProvider::bucketProvider();
$provider = AwsCredentialsCredentialProvider::memoize($provider);
try {
    $s3Client = new AwsS3S3Client([
    'region'      => $region,
    'version'     => '2006-03-01',
    'credentials' => $provider,
    ]);
}catch (AwsExceptionCredentialsException $ex){
	return null;
}

<?php
namespace applibraryAws;

use YafRegistry;

use AwsCredentialsCredentialProvider;
use GuzzleHttpPromise;
use AwsExceptionCredentialsException;
use GuzzleHttpPromiseRejectedPromise;
use AwsCredentialsCredentials;

/**
 * Class DB
 * @package applibraryAws
 * awazon 自定义credential,根椐存储桶，去获取access_id 和 access_secrect;
 */
class S3CredentialProvider extends CredentialProvider
{


    public static function bucketProvider()
    {
        return function () {
            $bucketInfo = [];
            try {
                $bucketInfo = applibraryAwsBucket::instance()->getBucketRegion(); //获取bucket信息。
            }catch(Exception $ex){                
                return new PromiseRejectedPromise(new CredentialsException("获取s3认证文件失败"));
            }

            $accessKey = isset($bucketInfo['accessKey']) && $bucketInfo['accessKey'] ? json_decode($bucketInfo['accessKey'],true) : [];
            $key = isset($accessKey['id']) && $accessKey['id'] ? $accessKey['id'] : '';
            $secret = isset($accessKey['key']) && $accessKey['key'] ? $accessKey['key'] : '';
            if ($key && $secret) {
                return Promisepromise_for(
                    new Credentials($key, $secret,NULL)
                );
            }            
            return new PromiseRejectedPromise(new CredentialsException("找不到s3的key,secrect用于认证"));
        };
    }

}