微信支付之APP支付代码,PHP代码库,德仔网

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【PHP】微信支付之APP支付
作者:mi-la-king / 发布于2015/3/5/ 836

	?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) );
	 }
	
	}
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