微信接口

//微信服务器发来的数据
protected $message;

//API 根地址
protected $apiUrl = 'https://api.weixin.qq.com';

public function __construct() {
$this->appid = c( 'weixin.appid' );
$this->appsecret = c( 'weixin.appsecret' );
$this->access_token = $this->getAccessToken();
//处理 微信服务器 发来的数据
$this->message = $this->parsePostRequestData();
}

//获取微信服务器发来的消息（官网消息或用户消息)
public function getMessage() {
return $this->message;
}

//解析微信发来的POST/XML数据
private function parsePostRequestData() {
if ( isset( $GLOBALS['HTTP_RAW_POST_DATA'] ) ) {
$post = $GLOBALS['HTTP_RAW_POST_DATA'];

return simplexml_load_string( $post, 'SimpleXMLElement', LIBXML_NOCDATA );
}
}

//微信接口整合验证进行绑定
public function valid() {
if ( ! isset( $_GET["echostr"] ) || ! isset( $_GET["signature"] ) || ! isset( $_GET["timestamp"] ) || ! isset( $_GET["nonce"] ) ) {
return FALSE;
}

$echoStr = $_GET["echostr"];
$signature = $_GET["signature"];
$timestamp = $_GET["timestamp"];
$nonce = $_GET["nonce"];
$token = c( 'weixin.token' );
$tmpArr = [ $token, $timestamp, $nonce ];
sort( $tmpArr, SORT_STRING );
$tmpStr = implode( $tmpArr );
$tmpStr = sha1( $tmpStr );

if ( $tmpStr == $signature ) {
echo $echoStr;
exit;
} else {
return FALSE;
}
}

/**
* 获取accessToken
* access_token是公众号的全局唯一票据，公众号调用各接口时都需使用access_token。开发者需要进行妥善保存。access_token的存储
* 至少要保留512个字符空间。access_token的有效期目前为2个小时，需定时刷新，重复获取将导致上次获取的access_token失效，
* 每天可获取2000次
* 服务器返回的 access_token 过期时间，一般2小时
*
* @param string $cacheKey 缓存key
* @param bool $force 强制获取
*
* @return bool
*/
public function getAccessToken( $cacheKey = '', $force = FALSE ) {
$cacheKey = $cacheKey ?: md5( c( 'weixin.appid' ) . c( 'weixin.appsecret' ) );

if ( $force === FALSE && $token = Cache::dir( 'storage/weixin' )->get( $cacheKey ) ) {
$this->access_token = $token;

return $token;
}

$url = $this->apiUrl . '/cgi-bin/token?grant_type=client_credential&appid=' . c( 'weixin.appid' ) . '&secret=' . c( 'weixin.appsecret' );

$data = Curl::get( $url );

$json = json_decode( $data, TRUE );

if ( array_key_exists( 'errcode', $json ) && $json['errcode'] != 0 ) {
//获取失败
return FALSE;
} else {
$this->access_token = $json['access_token'];
$this->expires_in = (int) $json['expires_in'];
//应该保存缓存。。。
Cache::dir( 'storage/weixin' )->set( $cacheKey, $this->access_token, 7000 );

return $this->access_token;
}
}

//将数据中的中文转url编码，因为微信不能识别\uxxx json_encode后的中文
protected function urlencodeArray( $data ) {
$result = [ ];
foreach ( $data as $i => $d ) {
$result[ urlencode( $i ) ] = is_array( $d ) ? $this->urlencodeArray( $d ) : urlencode( $d );
}

return $result;
}

//产生随机字符串，不长于32位
public function getRandStr( $length = 32 ) {
$chars = "abcdefghijklmnopqrstuvwxyz0123456789";
$str = "";
for ( $i = 0;$i < $length;$i ++ ) {
$str .= substr( $chars, mt_rand( 0, strlen( $chars ) - 1 ), 1 );
}

return $str;
}

//生成签名,支付或红包等使用
public function makeSign( $data ) {
//签名步骤一：按字典序排序参数
ksort( $data );
$string = $this->ToUrlParams( $data );
//签名步骤二：在string后加入KEY
$string = $string . "&key=" . c( 'weixin.key' );
//签名步骤三：MD5加密
$string = md5( $string );
//签名步骤四：所有字符转为大写
$result = strtoupper( $string );

return $result;
}

//格式化参数格式化成url参数 为生成签名服务
protected function ToUrlParams( $data ) {
$buff = "";
foreach ( $data as $k => $v ) {
if ( $k != "sign" && $k != "key" && $v != "" && ! is_array( $v ) ) {
$buff .= $k . "=" . $v . "&";
}
}

$buff = trim( $buff, "&" );

return $buff;
}

//获取实例
public function instance( $type ) {
$class = '\hdphp\weixin\build\\' . ucfirst( $type );

return new $class;
}