OSS\OssClient::auth PHP Method

    private function auth($options)
    {
        OssUtil::validateOptions($options);
        //验证bucket，list_bucket时不需要验证
        $this->authPrecheckBucket($options);
        //验证object
        $this->authPrecheckObject($options);
        //Object名称的编码必须是utf8
        $this->authPrecheckObjectEncoding($options);
        //验证ACL
        $this->authPrecheckAcl($options);
        // 获得当次请求使用的协议头，是https还是http
        $scheme = $this->useSSL ? 'https://' : 'http://';
        // 获得当次请求使用的hostname，如果是公共域名或者专有域名，bucket拼在前面构成三级域名
        $hostname = $this->generateHostname($options);
        $string_to_sign = '';
        $headers = $this->generateHeaders($options, $hostname);
        $signable_query_string_params = $this->generateSignableQueryStringParam($options);
        $signable_query_string = OssUtil::toQueryString($signable_query_string_params);
        $resource_uri = $this->generateResourceUri($options);
        //生成请求URL
        $conjunction = '?';
        $non_signable_resource = '';
        if (isset($options[self::OSS_SUB_RESOURCE])) {
            $conjunction = '&';
        }
        if ($signable_query_string !== '') {
            $signable_query_string = $conjunction . $signable_query_string;
            $conjunction = '&';
        }
        $query_string = $this->generateQueryString($options);
        if ($query_string !== '') {
            $non_signable_resource .= $conjunction . $query_string;
            $conjunction = '&';
        }
        $this->requestUrl = $scheme . $hostname . $resource_uri . $signable_query_string . $non_signable_resource;
        //创建请求
        $request = new RequestCore($this->requestUrl);
        $request->set_useragent($this->generateUserAgent());
        // Streaming uploads
        if (isset($options[self::OSS_FILE_UPLOAD])) {
            if (is_resource($options[self::OSS_FILE_UPLOAD])) {
                $length = null;
                if (isset($options[self::OSS_CONTENT_LENGTH])) {
                    $length = $options[self::OSS_CONTENT_LENGTH];
                } elseif (isset($options[self::OSS_SEEK_TO])) {
                    $stats = fstat($options[self::OSS_FILE_UPLOAD]);
                    if ($stats && $stats[self::OSS_SIZE] >= 0) {
                        $length = $stats[self::OSS_SIZE] - (int) $options[self::OSS_SEEK_TO];
                    }
                }
                $request->set_read_stream($options[self::OSS_FILE_UPLOAD], $length);
            } else {
                $request->set_read_file($options[self::OSS_FILE_UPLOAD]);
                $length = $request->read_stream_size;
                if (isset($options[self::OSS_CONTENT_LENGTH])) {
                    $length = $options[self::OSS_CONTENT_LENGTH];
                } elseif (isset($options[self::OSS_SEEK_TO]) && isset($length)) {
                    $length -= (int) $options[self::OSS_SEEK_TO];
                }
                $request->set_read_stream_size($length);
            }
        }
        if (isset($options[self::OSS_SEEK_TO])) {
            $request->set_seek_position((int) $options[self::OSS_SEEK_TO]);
        }
        if (isset($options[self::OSS_FILE_DOWNLOAD])) {
            if (is_resource($options[self::OSS_FILE_DOWNLOAD])) {
                $request->set_write_stream($options[self::OSS_FILE_DOWNLOAD]);
            } else {
                $request->set_write_file($options[self::OSS_FILE_DOWNLOAD]);
            }
        }
        if (isset($options[self::OSS_METHOD])) {
            $request->set_method($options[self::OSS_METHOD]);
            $string_to_sign .= $options[self::OSS_METHOD] . "\n";
        }
        if (isset($options[self::OSS_CONTENT])) {
            $request->set_body($options[self::OSS_CONTENT]);
            if ($headers[self::OSS_CONTENT_TYPE] === 'application/x-www-form-urlencoded') {
                $headers[self::OSS_CONTENT_TYPE] = 'application/octet-stream';
            }
            $headers[self::OSS_CONTENT_LENGTH] = strlen($options[self::OSS_CONTENT]);
            $headers[self::OSS_CONTENT_MD5] = base64_encode(md5($options[self::OSS_CONTENT], true));
        }
        uksort($headers, 'strnatcasecmp');
        foreach ($headers as $header_key => $header_value) {
            $header_value = str_replace(array("\r", "\n"), '', $header_value);
            if ($header_value !== '') {
                $request->add_header($header_key, $header_value);
            }
            if (strtolower($header_key) === 'content-md5' || strtolower($header_key) === 'content-type' || strtolower($header_key) === 'date' || isset($options['self::OSS_PREAUTH']) && (int) $options['self::OSS_PREAUTH'] > 0) {
                $string_to_sign .= $header_value . "\n";
            } elseif (substr(strtolower($header_key), 0, 6) === self::OSS_DEFAULT_PREFIX) {
                $string_to_sign .= strtolower($header_key) . ':' . $header_value . "\n";
            }
        }
        // 生成 signable_resource
        $signable_resource = $this->generateSignableResource($options);
        $string_to_sign .= rawurldecode($signable_resource) . urldecode($signable_query_string);
        $signature = base64_encode(hash_hmac('sha1', $string_to_sign, $this->accessKeySecret, true));
        $request->add_header('Authorization', 'OSS ' . $this->accessKeyId . ':' . $signature);
        if (isset($options[self::OSS_PREAUTH]) && (int) $options[self::OSS_PREAUTH] > 0) {
            $signed_url = $this->requestUrl . $conjunction . self::OSS_URL_ACCESS_KEY_ID . '=' . rawurlencode($this->accessKeyId) . '&' . self::OSS_URL_EXPIRES . '=' . $options[self::OSS_PREAUTH] . '&' . self::OSS_URL_SIGNATURE . '=' . rawurlencode($signature);
            return $signed_url;
        } elseif (isset($options[self::OSS_PREAUTH])) {
            return $this->requestUrl;
        }
        if ($this->timeout !== 0) {
            $request->timeout = $this->timeout;
        }
        if ($this->connectTimeout !== 0) {
            $request->connect_timeout = $this->connectTimeout;
        }
        try {
            $request->send_request();
        } catch (RequestCore_Exception $e) {
            throw new OssException('RequestCoreException: ' . $e->getMessage());
        }
        $response_header = $request->get_response_header();
        $response_header['oss-request-url'] = $this->requestUrl;
        $response_header['oss-redirects'] = $this->redirects;
        $response_header['oss-stringtosign'] = $string_to_sign;
        $response_header['oss-requestheaders'] = $request->request_headers;
        $data = new ResponseCore($response_header, $request->get_response_body(), $request->get_response_code());
        //retry if OSS Internal Error
        if ((int) $request->get_response_code() === 500) {
            if ($this->redirects <= $this->maxRetries) {
                //设置休眠
                $delay = (int) (pow(4, $this->redirects) * 100000);
                usleep($delay);
                $this->redirects++;
                $data = $this->auth($options);
            }
        }
        $this->redirects = 0;
        return $data;
    }