PHP阿里云OSS生成STS_TOKEN，用于JS签名直接上传

<?php
	require __DIR__.'/../utils/vendor/autoload.php';

	use AlibabaCloud\Client\AlibabaCloud;
	use AlibabaCloud\Client\Exception\ClientException;
	use AlibabaCloud\Client\Exception\ServerException;

	function gmt_iso8601($time) {
	    $dtStr = date("c", $time);
	    $mydatetime = new DateTime($dtStr);
	    $expiration = $mydatetime->format(DateTime::ISO8601);
	    $pos = strpos($expiration, '+');
	    $expiration = substr($expiration, 0, $pos);
	    return $expiration."Z";
	}
	 
	function oss_signature($id,$key,$host,$expire,$dir,$SecurityToken){
	    $now = time();
	    $end = $now + $expire;
	    $expiration = gmt_iso8601($end);
	 
	    //最大文件大小.用户可以自己设置
	    $condition = array(0=>'content-length-range', 1=>0, 2=>1048576000);
	    $conditions[] = $condition; 
	 
	    //表示用户上传的数据,必须是以$dir开始, 不然上传会失败,这一步不是必须项,只是为了安全起见,防止用户通过policy上传到别人的目录
	    $start = array(0=>'starts-with', 1=>'$key', 2=>$dir);
	    $conditions[] = $start; 
	 
	 
	    $arr = array('expiration'=>$expiration,'conditions'=>$conditions);
	    //echo json_encode($arr);
	    //return;
	    $policy = json_encode($arr);
	    $base64_policy = base64_encode($policy);
	    $string_to_sign = $base64_policy;
	    $signature = base64_encode(hash_hmac('sha1', $string_to_sign, $key, true));
	 
	    $response = array();
	    $response['accessid'] = $id;
	    $response['host'] = $host;
	    $response['policy'] = $base64_policy;
	    $response['signature'] = $signature;
	    $response['expire'] = $end;
	    //这个参数是设置用户上传指定的前缀
	    $response['dir'] = $dir;
	    $response['secToken'] = $SecurityToken;
	    return $response;
	}

	//构建一个阿里云客户端，用于发起请求。
	AlibabaCloud::accessKeyClient('AccessKeyId', 'AccessKeySecret')
		                ->regionId('region_id')
		                ->asDefaultClient();
	//设置参数，发起请求。
	try {
		$result = AlibabaCloud::sts()
		->v20150401()
		->assumeRole()
		->withRoleSessionName($client_id)
		->withRoleArn($oss_access_role)
		->request();
		$result = $result->toArray();
		echo json_encode($result);
	} catch (ClientException $e) {
		echo json_encode(array('status'=>'0','message'=>'ERROR_CLIENT'));
	} catch (ServerException $e) {
		echo json_encode(array('status'=>'0','message'=>'ERROR_SERVER','DATAS'=>$e->getErrorMessage()));
	}
?>