\Freyo\LaravelQueueCMQ\Queue\DriverSignature

<?php

namespace Freyo\LaravelQueueCMQ\Queue\Driver;

use Exception;

/**
 * Sign
 * 签名类
 */
class Signature
{
    /**
     * sign
     * 生成签名
     *
     * @param  string $srcStr    拼接签名源文字符串
     * @param  string $secretKey secretKey
     * @param  string $method    请求方法
     *
     * @return string
     * @throws Exception
     */
    public static function sign($srcStr, $secretKey, $method = 'HmacSHA1')
    {
        switch ($method) {
            case 'HmacSHA1':
                $retStr = base64_encode(hash_hmac('sha1', $srcStr, $secretKey, true));
                break;
            case 'HmacSHA256':
                $retStr = base64_encode(hash_hmac('sha256', $srcStr, $secretKey, true));
                break;
            default:
                throw new Exception($method . ' is not a supported encrypt method');
                break;
        }

        return $retStr;
    }


    /**
     * makeSignPlainText
     * 生成拼接签名源文字符串
     *
     * @param  array  $requestParams 请求参数
     * @param  string $requestMethod 请求方法
     * @param string  $requestHost   接口域名
     * @param  string $requestPath   url路径
     *
     * @return string
     */
    public static function makeSignPlainText($requestParams,
        $requestMethod = 'POST', $requestHost = '',
        $requestPath = '/v2/index.php')
    {

        $url = $requestHost . $requestPath;

        // 取出所有的参数
        $paramStr = self::_buildParamStr($requestParams, $requestMethod);

        $plainText = $requestMethod . $url . $paramStr;

        return $plainText;
    }

    /**
     * _buildParamStr
     * 拼接参数
     *
     * @param  array  $requestParams 请求参数
     * @param  string $requestMethod 请求方法
     *
     * @return string
     */
    protected static function _buildParamStr($requestParams, $requestMethod = 'POST')
    {
        $paramStr = '';
        ksort($requestParams);
        $i = 0;
        foreach ($requestParams as $key => $value) {
            if ($key == 'Signature') {
                continue;
            }
            // 排除上传文件的参数
            if ($requestMethod == 'POST' && substr($value, 0, 1) == '@') {
                continue;
            }
            // 把 参数中的 _ 替换成 .
            if (strpos($key, '_')) {
                $key = str_replace('_', '.', $key);
            }

            if ($i == 0) {
                $paramStr .= '?';
            } else {
                $paramStr .= '&';
            }
            $paramStr .= $key . '=' . $value;
            ++$i;
        }

        return $paramStr;
    }

}