?phpnamespace common\\services\\WechatPay; class WechatAppPay extends WechatPayBase{ //package参数 public $package = []; //异步通知参数 public $notify = []; //推送预支付订单参数 protected $config = []; //存储access token和
<?php
namespace common\\services\\WechatPay;
class WechatAppPay extends WechatPayBase
{
//package参数
public $package = [];
//异步通知参数
public $notify = [];
//推送预支付订单参数
protected $config = [];
//存储access token和获取时间的文件
protected $file;
//access token
protected $accessToken;
//取access token的url
const ACCESS_TOKEN_URL = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=%s&secret=%s';
//生成预支付订单提交地址
const POST_ORDER_URL = 'https://api.weixin.qq.com/pay/genprepay?access_token=%s';
public function __construct()
{
$this->file = __DIR__ . '/payAccessToken.txt';
}
/**
* 创建APP支付最终返回参数
* @throws \\Exception
* @return multitype:string NULL
*/
public function createAppPayData()
{
$this->generateConfig();
$prepayid = $this->getPrepayid();
try{
$array = [
'appid' => $this->appid,
'appkey' => $this->paySignkey,
'noncestr' => $this->getRandomStr(),
'package' => 'Sign=WXPay',
'partnerid' => $this->partnerId,
'prepayid' => $prepayid,
'timestamp' => (string)time(),
];
$array['sign'] = $this->sha1Sign($array);
unset($array['appkey']);
} catch(\\Exception $e) {
throw new \\Exception($e->getMessage());
}
return $array;
}
/**
* 验证支付成功后的通知参数
*
* @throws \\Exception
* @return boolean
*/
public function verifyNotify()
{
try{
$staySignStr = $this->notify;
unset($staySignStr['sign']);
$sign = $this->signData($staySignStr);
return $this->notify['sign'] === $sign;
} catch(\\Exception $e) {
throw new \\Exception($e->getMessage());
}
}
/**
* 魔术方法，给添加支付参数进来
*
* @param string $name 参数名
* @param string $value 参数值
*/
public function __set($name, $value)
{
$this->$name = $value;
}
/**
* 设置access token
* @param string $token
* @throws \\Exception
* @return boolean
*/
public function setAccessToken()
{
try{
if(!file_exists($this->file) || !is_file($this->file)) {
$f = fopen($this->file, 'a');
fclose($f);
}
$content = file_get_contents($this->file);
if(!empty($content)) {
$info = json_decode($content, true);
if( time() - $info['getTime'] < 7150 ) {
$this->accessToken = $info['accessToken'];
return true;
}
}
//文件内容为空或access token已失效，重新获取
$this->outputAccessTokenToFile();
} catch(\\Exception $e) {
throw new \\Exception($e->getMessage());
}
return true;
}
/**
* 写入access token 到文件
* @throws \\Exception
* @return boolean
*/
protected function outputAccessTokenToFile()
{
try{
$f = fopen($this->file, 'wb');
$token = [
'accessToken' => $this->getAccessToken(),
'getTime' => time(),
];
flock($f, LOCK_EX);
fwrite($f, json_encode($token));
flock($f, LOCK_UN);
fclose($f);
$this->accessToken = $token['accessToken'];
} catch(\\Exception $e) {
throw new \\Exception($e->getMessage());
}
return true;
}
/**
* 取access token
*
* @throws \\Exception
* @return string
*/
protected function getAccessToken()
{
$url = sprintf(self::ACCESS_TOKEN_URL, $this->appid, $this->appSecret);
$result = json_decode( $this->getUrl($url), true );
if(isset($result['errcode'])) {
throw new \\Exception("get access token failed:{$result['errmsg']}");
}
return $result['access_token'];
}
/**
* 取预支付会话标识
*
* @throws \\Exception
* @return string
*/
protected function getPrepayid()
{
$data = json_encode($this->config);
$url = sprintf(self::POST_ORDER_URL, $this->accessToken);
$result = json_decode( $this->postUrl($url, $data), true );
if( isset($result['errcode']) && $result['errcode'] != 0 ) {
throw new \\Exception($result['errmsg']);
}
if( !isset($result['prepayid']) ) {
throw new \\Exception('get prepayid failed, url request error.');
}
return $result['prepayid'];
}
/**
* 组装预支付参数
*
* @throws \\Exception
*/
protected function generateConfig()
{
try{
$this->config = [
'appid' => $this->appid,
'traceid' => $this->traceid,
'noncestr' => $this->getRandomStr(),
'timestamp' => time(),
'package' => $this->generatePackage(),
'sign_method' => $this->sign_method,
];
$this->config['app_signature'] = $this->generateSign();
} catch(\\Exception $e) {
throw new \\Exception($e->getMessage());
}
}
/**
* 生成package字段
*
* 生成规则:
* 1、生成sign的值signValue
* 2、对package参数再次拼接成查询字符串，值需要进行urlencode
* 3、将sign=signValue拼接到2生成的字符串后面得到最终的package字符串
*
* 第2步urlencode空格需要编码成%20而不是+
*
* RFC 1738会把 空格编码成+
* RFC 3986会把空格编码成%20
*
* @return string
*/
protected function generatePackage()
{
$this->package['sign'] = $this->signData($this->package);
return http_build_query($this->package, '', '&', PHP_QUERY_RFC3986);
}
/**
* 生成签名
*
* @return string
*/
protected function generateSign()
{
$signArray = [
'appid' => $this->appid,
'appkey' => $this->paySignkey,
'noncestr' => $this->config['noncestr'],
'package' => $this->config['package'],
'timestamp' => $this->config['timestamp'],
'traceid' => $this->traceid,
];
return $this->sha1Sign($signArray);
}
/**
* 签名数据
*
* 生成规则:
* 1、字典排序，拼接成查询字符串格式，不需要urlencode
* 2、上一步得到的字符串最后拼接上key=paternerKey
* 3、MD5哈希字符串并转换成大写得到sign的值signValue
*
* @param array $data 待签名数据
* @return string 最终签名结果
*/
protected function signData($data)
{
ksort($data);
$str = $this->arrayToString($data);
$str .= "&key={$this->partnerKey}";
return strtoupper( $this->signMd5($str) );
}
/**
* sha1签名
* 签名规则
* 1、字典排序
* 2、拼接查询字符串
* 3、sha1运算
*
* @param array $arr
* @return string
*/
protected function sha1Sign($arr)
{
ksort($arr);
return sha1( $this->arrayToString($arr) );
}
}