<?php
namespace App\ServicePay;
trait ThirdPaySignTrait
{
    /**
     * md5 大写签名
     * @param string $method
     * @param array $requestData
     * @param string $payKey
     * @param array $filter
     * @return string 签名MD5转大写
     */
    public function md5Verify(string $method,array $requestData,string $payKey,array $filter=[]):string {
        if ($method == 'create') {
            $keyVal = self::keySortMd5Filter($requestData, $filter);
            $keyVal = $keyVal . "key=" . $payKey;
            $mysgin = strtoupper(md5($keyVal));
        } else {
            $keyVal = self::keySortMd5Filter($requestData, $filter);
            $keyVal = $keyVal . "key=" . $payKey;
            $mysgin = strtoupper(md5($keyVal));
        }
        return $mysgin;
    }

    /** key val 不用等号链接
     * @param $requestData
     * @param $payKey
     * @param $filter
     * @return string
     */
    public function md5KeyLower(array $requestData,$payKey,array $filter=[]):string {
        $tempArr = [];
        foreach ($requestData as $key => $val) {
            if (!in_array($key, $filter)) {
                $tempArr[strtolower($key)] = strtolower($val);
            }
        }
        ksort($tempArr);
        $keyVal = '';
        foreach ($tempArr as $key2 => $val2) {
            $keyVal .= $key2 . $val2;
        }
        $keyVal = $keyVal . $payKey;
        $mysgin = strtolower(md5($keyVal));
        return $mysgin;
    }

    /**
     * 只对key value 排序 不拼KEY 不 MD5
     * @param array $requestData
     * @param array $filter
     * @return string
     */
    private static function keySortMd5Filter(array $requestData,array $filter=[]):string {
        $tempArr = [];
        foreach ($requestData as $key => $val) {
            if (!in_array($key, $filter)) {
                $tempArr[$key] = $val;
            }
        }
        ksort($tempArr);
        $keyVal = '';
        foreach ($tempArr as $k => $val) {
            $keyVal .= $k . "=" . $val . "&";
        }
        return $keyVal;
    }


    /**
     * @param array $requestData
     * @param string $split
     * @param array $filter
     * @return string
     */
    public static function valueKeySortSplitFilter(array $requestData,string $split='|',array $filter=[]):string {
        $tempArr = [];
        foreach ($requestData as $key => $val) {
            if (!in_array($key, $filter)) {
                $tempArr[$key] = $val;
            }
        }
        ksort($tempArr);
        $keyVal = '';
        foreach ($tempArr as $k => $val) {
            $keyVal .=  $val . $split;
        }
        return trim($keyVal,$split);
    }


    /**
     * 根据用户指定的顺序排列 用value拼接
     * @param array $requestData
     * @param array $userSort
     * @param string $split
     * @return string
     */
    public function userSortValueSplitFilter(array $requestData, array $userSort, string $split = '|'): string
    {
        $keyVal = '';
        foreach ($userSort as $r) {
            if (array_key_exists($r, $requestData)) {
                $keyVal .= $requestData[$r] . $split;
            }
        }
        return trim($keyVal, $split);
    }

    /**
     * 使用指定的一些字段签名拼接
     * @param array $requestData
     * @param array $userParam
     * @param string $split
     * @return string
     */
    public function userParamSplitKeyValue(array $requestData,array $userParam,string $split='|'):string {
        $tempArr = array_filter($requestData, function ($k) use ($userParam) {
            return in_array($k, $userParam);
        }, ARRAY_FILTER_USE_KEY);
        ksort($tempArr);
        $keyVal = '';
        foreach ($tempArr as $k => $val) {
            $keyVal .= $k . "=" . $val . $split;
        }
        return trim($keyVal, $split);
    }

    /**
     * @param $publicKey
     * @return string
     */
    public function formatPublicKey($publicKey){
        $publicKey = "-----BEGIN PUBLIC KEY-----\n" . chunk_split($publicKey, 64, "\n") . "-----END PUBLIC KEY-----";
        return $publicKey;
    }

    /**
     * 验证签名
     * @param string $data 数据
     * @param string $sign 签名
     * @param string $publicKey 公钥
     * @return bool
     */
    public function verifySign($data = '', $sign = '', $publicKey = '')
    {
        if (!is_string($sign) || !is_string($sign)) {
            return false;
        }
        return (bool)openssl_verify(
            $data,
            base64_decode($sign),
            $publicKey,
            OPENSSL_ALGO_SHA256
        );
    }
}