<?php

namespace Alidayu;

/**
 * 签名助手 2017/11/19
 *
 * Class Signature
 */
class Signature {

    /**
     * 生成签名并发起请求
     *
     * @param $akId string AccessKeyId (https://ak-console.aliyun.com/)
     * @param $akSecret string AccessKeySecret
     * @param $domain string API接口所在域名
     * @param $params array API具体参数
     * @param $security boolean 使用https
     * @param $method boolean 使用GET或POST方法请求，VPC仅支持POST
     * @return bool|\stdClass 返回API接口调用结果，当发生错误时返回false
     */
    public function request($akId, $akSecret, $domain, $params, $security=false, $method='POST') {
        $sres = $this->signUrl($akId, $akSecret, $params, $method);
        $url = ($security ? 'https' : 'http')."://{$domain}/"; 
        try {
            $json = $this->fetchData($url, $method, "Signature={$sres['sign']}{$sres['qstr']}");
            return $json;
        } catch( \Exception $e) {
            return false;
        }
    }

    static function signUrl($akId, $akSecret, $params, $method='POST')
    {
        $apiParams = array_merge(array (
            "SignatureMethod" => "HMAC-SHA1",
            "SignatureNonce" => uniqid(mt_rand(0,0xffff), true),
            "SignatureVersion" => "1.0",
            "AccessKeyId" => $akId,
            "Timestamp" => gmdate("Y-m-d\TH:i:s\Z"),
            "Format" => "JSON",
        ), $params);
        ksort($apiParams);
        $strQuery = "";
        foreach ($apiParams as $key => $value) {
            $strQuery .= "&$key=" . self::encode($value);
        }
        $stringToSign = "${method}&%2F&" . self::encode(substr($strQuery, 1));
        $sign = base64_encode(hash_hmac("sha1", $stringToSign, $akSecret."&", true));
        $signature = self::encode($sign);
        return ['sign'=>$signature, 'qstr'=>$strQuery];
    }

    static function encode($str)
    {
        $res = urlencode($str);
        $res = preg_replace("/\+/", "%20", $res);
        $res = preg_replace("/\*/", "%2A", $res);
        $res = preg_replace("/%7E/", "~", $res);
        return $res;
    }

    static function fetchData($url, $method, $body) {
        $ch = curl_init();
        if($method == 'POST') {
            curl_setopt($ch, CURLOPT_POST, 1);//post提交方式
            curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
        } else {
            $url .= '?'.$body;
        }
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_TIMEOUT, 5);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array(
            "x-sdk-client" => "php/2.0.0"
        ));
        if(substr($url, 0,5) == 'https') {
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        }
        $rtn = curl_exec($ch);
        if($rtn === false) {
            // 大多由设置等原因引起，一般无法保障后续逻辑正常执行，
            // 所以这里触发的是E_USER_ERROR，会终止脚本执行，无法被try...catch捕获，需要用户排查环境、网络等故障
            trigger_error("[CURL_" . curl_errno($ch) . "]: " . curl_error($ch), E_USER_ERROR);
        }
        curl_close($ch);
        return $rtn;
    }
}
