<?php
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
abstract class RpcAcsRequest extends AcsRequest
{
    private $dateTimeFormat = 'Y-m-d\TH:i:s\Z';
    private $domainParameters = array();
    
    public function __construct($product, $version, $actionName)
    {
        parent::__construct($product, $version, $actionName);
        $this->initialize();
    }
    
    private function initialize()
    {
        $this->setMethod("GET");
        $this->setAcceptFormat("JSON");
    }
    

    private function prepareValue($value)
    {
        if (is_bool($value)) {
            if ($value) {
                return "true";
            } else {
                return "false";
            }
        } else {
            return $value;
        }
    }

    public function composeUrl($iSigner, $credential, $domain)
    {
        $apiParams = parent::getQueryParameters();
        foreach ($apiParams as $key => $value) {
            $apiParams[$key] = $this->prepareValue($value);
        }
        $apiParams["RegionId"] = $this->getRegionId();
        $apiParams["AccessKeyId"] = $credential->getAccessKeyId();
        $apiParams["Format"] = $this->getAcceptFormat();
        $apiParams["SignatureMethod"] = $iSigner->getSignatureMethod();
        $apiParams["SignatureVersion"] = $iSigner->getSignatureVersion();
        $apiParams["SignatureNonce"] = uniqid();
        date_default_timezone_set("GMT");
        $apiParams["Timestamp"] = date($this->dateTimeFormat);
        $apiParams["Action"] = $this->getActionName();
        $apiParams["Version"] = $this->getVersion();
        $apiParams["Signature"] = $this->computeSignature($apiParams, $credential->getAccessSecret(), $iSigner);
        if (parent::getMethod() == "POST") {
            $requestUrl = $this->getProtocol()."://". $domain . "/";
            foreach ($apiParams as $apiParamKey => $apiParamValue) {
                $this->putDomainParameters($apiParamKey, $apiParamValue);
            }
            return $requestUrl;
        } else {
            $requestUrl = $this->getProtocol()."://". $domain . "/?";

            foreach ($apiParams as $apiParamKey => $apiParamValue) {
                $requestUrl .= "$apiParamKey=" . urlencode($apiParamValue) . "&";
            }
            return substr($requestUrl, 0, -1);
        }
    }
    
    private function computeSignature($parameters, $accessKeySecret, $iSigner)
    {
        ksort($parameters);
        $canonicalizedQueryString = '';
        foreach ($parameters as $key => $value) {
            $canonicalizedQueryString .= '&' . $this->percentEncode($key). '=' . $this->percentEncode($value);
        }
        $stringToSign = parent::getMethod().'&%2F&' . $this->percentencode(substr($canonicalizedQueryString, 1));
        $signature = $iSigner->signString($stringToSign, $accessKeySecret."&");

        return $signature;
    }
    
    protected function percentEncode($str)
    {
        $res = urlencode($str);
        $res = preg_replace('/\+/', '%20', $res);
        $res = preg_replace('/\*/', '%2A', $res);
        $res = preg_replace('/%7E/', '~', $res);
        return $res;
    }
    
    public function getDomainParameter()
    {
        return $this->domainParameters;
    }
    
    public function putDomainParameters($name, $value)
    {
        $this->domainParameters[$name] = $value;
    }
}