微信支付之APP支付

微信开放平台移动应用集成微信支付功能。 具体使用请移步：http://www.360us.net/article/23.html 仅仅是消费功能，其他功能没有加。 开放平台的微信支付和公众号的微信支付是不一样的，这里说明一下。 无 ?phpnamespace common\services\WechatPay;class Wec

微信开放平台移动应用集成微信支付功能。
具体使用请移步：http://www.360us.net/article/23.html
仅仅是消费功能，其他功能没有加。

开放平台的微信支付和公众号的微信支付是不一样的，这里说明一下。

<?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) );
	}

}