oss 上传图片鉴权，临时权限

<?php


/**
 * 公共方法
 */

defined('DYMall') or exit('Access Invalid!');

useOSSOssClient;
useOSSCoreOssUtil;
useOSSCoreOssException;
useOSSHttpRequestCore;
useOSSHttpResponseCore;


require_once(BASE_ROOT_PATH.'/library/smartphp/libraries/OSS/autoload.php');
classosssecurityCtl{

    const OSS_URL_KEY = 'ossSecurityUrl';
    const OSS_TIME = 3600;

    const OSS_STS_URL = 'https://sts.aliyuncs.com';
    const FORMAT = 'JSON';
    const VERSION = '2015-04-01';
    const SIGN_ATURE_METHOD = 'HMAC-SHA1';
    const SIGN_ATURE_VERSION = '1.0';
    const ROLE_SESSION_NAME = 'web****ss';
    const OSS_STS_TOKEN = 'images:oss:sts:token';
    const OSS_ARN = 'acs:ram::136*******:role/w*****s'; //格式说明oss官网上有说明
    const OSS_STS_ACCESS_ID = 'LTAI4****9u3h';
    const OSS_ACCESE_SECRET = 'bv*******3B';

     /**
     * The name and signature of the console command.
     * @var string
     */
    protected $signature = 'get:OssStsToken';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = '[OSS]定期更新OSS Sts Token';

    public function__construct()
    {
        $this->redis = caching::getInstance();
    }

    public functionindex(){
        //生成token
        $token = $this->handle();

        $endpoint = $GLOBALS['setting_config']['oss_url'];
        $bucket = $GLOBALS['setting_config']['oss_pre'];
        $object = 'data/upload/mobile/share/poster/'; //oss的图片上传路径，后面必须加上反斜杠否则报错
//此处有个坑，阿里云文档中没有写明，此处因为是生成临时鉴权，来传递图片，所以用建立用户时生成的acesseckeyid去生成token，
// 生成的$token 会返回临时的  token值跟 AccessKeyId 跟 AccessKeySecret 跟Expiration 此处是生成的临时用的 acessid 跟 accesesecret
// 然后用生成的临时的 acceesskeyid  跟 accesskeysecret 跟token去生成临时鉴权的url ，不要用原来的 OSS_STS_ACCESS_ID
$ossClient = new OSSOssClient($token['AccessKeyId'], $token['AccessKeySecret'], $endpoint, false,$token['SecurityToken']);
        try{
            $is_keys = $this->redis->exists(self::OSS_URL_KEY);
            if($is_keys) {
                 $signedUrl = $this->redis->get(self::OSS_URL_KEY);
            }else{
                //生成PutObject的签名URL。
                $signedUrl = $ossClient->signUrl($bucket, $object, self::OSS_TIME);
                $this->redis->set(self::OSS_URL_KEY, $signedUrl, self::OSS_TIME);
            }

        }catch (OssException $e){
            output_error($e->getMessage());
        }
        $signedUrl = $signedUrl.'&AccessKeySecret='.$token['AccessKeySecret'].'&bucketName='.$bucket.'&endpoint='.$endpoint;
         $arr = parse_url($signedUrl);
         $arrQeury = $arr['query'];
         $explarr = explode('&', $arrQeury);
         $urlarr =[];
         foreach($explarr as $k =>$v){ 
            $arr1=explode('=',$v);
            $urlarr[$arr1[0]] = $arr1[1];
        }
        output_data($urlarr);//此处是将数据json后返回前段，token会被转义，所以前段拿到值后需要jsondecode一下在转义回来使用
    }


    /**
     * 定期更新Oss Sts token
     *
     * @return mixed
     */
    private functionhandle()
    {
        if($this->redis->exists(self::OSS_STS_TOKEN)) {
            return $this->redis->get(self::OSS_STS_TOKEN);
        }
        date_default_timezone_set("GMT");
        $params =[
            //获取公共参数
            'Format' => self::FORMAT,
            'Version' => self::VERSION,
            'AccessKeyId' => self::OSS_STS_ACCESS_ID,
            'SignatureMethod' => self::SIGN_ATURE_METHOD,
            'SignatureVersion' => self::SIGN_ATURE_VERSION,
            'SignatureNonce' => uniqid(),
            'Timestamp' => date('Y-m-dTH:i:s'),
            //获取接口参数
            'Action' => 'AssumeRole',
            'RoleArn' => self::OSS_ARN,
            'RoleSessionName' => self::ROLE_SESSION_NAME,];
        ksort($params);
        $oss_access_key = self::OSS_ACCESE_SECRET;
        $sign = '';
        $items =[];
        foreach($params as $key => $value){
            $items[] = rawurlencode($key) . '=' . rawurlencode($value);
            $sign .= '&' . $this->percentEncode($key). '=' . $this->percentEncode($value);
        }
        $sign = 'GET&%2F&' . $this->percentencode(substr($sign, 1));
        $signature = base64_encode(hash_hmac('sha1', $sign, $oss_access_key . "&", true));
        $url = self::OSS_STS_URL . '?' . implode('&', $items) . '&Signature=' . rawurlencode($signature);
        $token = $this->getApi($url);
        $time = date('Y-m-d H:i:s', time());
        if (!empty($token)) {
            $this->redis->set(self::OSS_STS_TOKEN, $token, self::OSS_TIME);
            return $token;
        }
    }



    private function percentEncode($str)
    {
        $res = urlencode($str);
        $res = preg_replace('/+/', '%20', $res);
        $res = preg_replace('/*/', '%2A', $res);
        $res = preg_replace('/%7E/', '~', $res);
        return $res;
    }

    private function getApi($url){

        $ch =curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); 
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); 
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($ch);
        curl_close($ch);
        $output = json_decode($output,true);
        if(!isset($output['Credentials'])){
            return false;
        }else{
            return $output['Credentials'];
        }
    }

}