前面两篇我们介绍了商户进件，jsapi调起支付。这篇文章我们来说一下，微信支付成功后的回调。
在下订单的时候，我们设置了回调地址，当微信支付成功后，它会访问你设置的那个回调地址。注意：回调地址不能拼接任何参数。
//回调地址
public function notifyUrl(){
$header = $this->getHeaders();//读取http头信息 见下文
$body = file_get_contents('php://input');//读取微信传过来的信息，是一个json字符串
if (empty($header)|| empty($body)) {
throw new Exception('通知参数为空', 2001);
}
$timestamp = $header['WECHATPAY-TIMESTAMP'];
$nonce = $header['WECHATPAY-NONCE'];
$signature = $header['WECHATPAY-SIGNATURE'];
$serialNo = $header['WECHATPAY-SERIAL'];
if (empty($timestamp) || empty($nonce) || empty($signature) || empty($serialNo)) {
throw new Exception('通知头参数为空', 2002);
}
$cert = $this->getzhengshuDb();
if($cert!=$serialNo){
throw new Exception('验签失败', 2005);
}
$message = "$timestamp\n$nonce\n$body\n";
//校验签名
if (!$this->verify($message, $signature, 'E:\项目\cert\cert.pem')) {//E:\项目\cert\cert.pem是获取平台证书序列号getzhengshuDb()时保存下来的平台公钥
throw new Exception('验签失败', 2005);
}
$decodeBody = json_decode($body,true);
if (empty($decodeBody) || !isset($decodeBody['resource'])) {
throw new Exception('通知参数内容为空', 2003);
}
$decodeBodyResource = $decodeBody['resource'];
$decodeData = $this->decryptToStringHd($decodeBodyResource['associated_data'], $decodeBodyResource['nonce'],$decodeBodyResource['ciphertext'], '');//解密resource
$decodeData = json_decode($decodeData, true);
foreach($decodeData['sub_orders'] as $val){//循环解密出来的子订单
if($val['trade_state']=="SUCCESS"){//判断是否支付成功
$val['out_trade_no'];//是商户的自定义订单号
$val['transaction_id'];//微信的支付单号
}
}
$arr=array("code"=>"SUCCESS","message"=>"");
echo json_encode($arr);
exit;
}
//获取微信回调http头信息
public function getHeaders(){
$headers = array();
foreach ($_SERVER as $key => $value) {
if ('HTTP_' == substr($key, 0, 5)) {
$headers[str_replace('_', '-', substr($key, 5))] = $value;
}
if (isset($_SERVER['PHP_AUTH_DIGEST'])) {
$header['AUTHORIZATION'] = $_SERVER['PHP_AUTH_DIGEST'];
} elseif (isset($_SERVER['PHP_AUTH_USER']) && isset($_SERVER['PHP_AUTH_PW'])) {
$header['AUTHORIZATION'] = base64_encode($_SERVER['PHP_AUTH_USER'] . ':' . $_SERVER['PHP_AUTH_PW']);
}
if (isset($_SERVER['CONTENT_LENGTH'])) {
$header['CONTENT-LENGTH'] = $_SERVER['CONTENT_LENGTH'];
}
if (isset($_SERVER['CONTENT_TYPE'])) {
$header['CONTENT-TYPE'] = $_SERVER['CONTENT_TYPE'];
}
}
return $headers;
}
//获取平台证书序列号
public function getzhengshuDb(){
$url="https://api.mch.weixin.qq.com/v3/certificates";
$timestamp=time();//时间戳
$nonce=$this->nonce_str();//获取一个随机数
$body="";
$mch_private_key=$this->getPublicKey();//读取商户api证书公钥
$merchant_id='1234567890';//服务商商户号
$serial_no='商户证书序列号';//在API安全中获取
$sign=$this->sign($url,'GET',$timestamp,$nonce,$body,$mch_private_key,$merchant_id,$serial_no);//签名
$header=[
'Authorization:WECHATPAY2-SHA256-RSA2048 '.$sign,
'Accept:application/json',
'User-Agent:'.$merchant_id
];
$result=$this->curl($url,'',$header,'GET');
$result=json_decode($result,true);
$serial_no=$result['data'][0]['serial_no'];
$encrypt_certificate=$result['data'][0]['encrypt_certificate'];
$sign_key="32位微信v3商户证书密钥";//在API安全中设置
$result=$this->decryptToString($encrypt_certificate['associated_data'],$encrypt_certificate['nonce'],$encrypt_certificate['ciphertext'],$sign_key);//解密
file_put_contents('E:\项目\cert\cert.pem',$result);
return $serial_no;
}
//生成随机字符串
public function nonce_str($length=32){
$chars = "abcdefghijklmnopqrstuvwxyz0123456789";
$str ="";
for ( $i = 0; $i < $length; $i++ ) {
$str.= substr($chars, mt_rand(0, strlen($chars)-1), 1);
}
return $str;
}
//读取商户api证书公钥
public function getPublicKey()
{
return openssl_get_privatekey(file_get_contents('E:\项目\cert\apiclient_key.pem'));//微信商户平台中下载下来，保存到服务器直接读取
}
//签名
public function sign($url,$http_method,$timestamp,$nonce,$body,$mch_private_key,$merchant_id,$serial_no){
$url_parts=parse_url($url);
$canonical_url=($url_parts['path'].(!empty($url_parts['query'])?"?${url_parts['query']}":""));
$message=
$http_method . "\n".
$canonical_url . "\n".
$timestamp . "\n".
$nonce . "\n".
$body . "\n";
openssl_sign($message,$raw_sign,$mch_private_key,'sha256WithRSAEncryption');
$sign=base64_encode($raw_sign);
$schema='WECHATPAY2-SHA256-RSA2048';
$token=sprintf(
'mchid="%s",nonce_str="%s",signature="%s",timestamp="%d",serial_no="%s"',
$merchant_id,
$nonce,
$sign,
$timestamp,
$serial_no
);
return $token;
}
//curl提交
public function curl($url,$data=[],$header,$method='POST'){
$curl=curl_init();
curl_setopt($curl,CURLOPT_URL,$url);
curl_setopt($curl,CURLOPT_HTTPHEADER,$header);
curl_setopt($curl,CURLOPT_HEADER,false);
curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);
curl_setopt($curl,CURLOPT_SSL_VERIFYPEER,false);
if($method=="POST"){
curl_setopt($curl,CURLOPT_POST,TRUE);
curl_setopt($curl,CURLOPT_POSTFIELDS,$data);
}
$result=curl_exec($curl);
curl_close($curl);
return $result;
}
//解密返回的信息
public function decryptToString($associatedData,$nonceStr,$ciphertext,$aesKey){
$ciphertext=\base64_decode($ciphertext);
if(function_exists('\sodium_crypto_aead_aes256gcm_is_available')&& \sodium_crypto_aead_aes256gcm_is_available()){
return \sodium_crypto_aead_aes256gcm_decrypt($ciphertext,$associatedData,$nonceStr,$aesKey);
}
if(PHP_VERSION_ID >= 70100 && in_array('aes-256-gcm', \openssl_get_cipher_methods())){
$ctext=substr($ciphertext,0,-16);
$authTag=substr($ciphertext,-16);
return \openssl_decrypt(
$ctext,
'aes-256-gcm',
$aesKey,
\OPENSSL_RAW_DATA,
$nonceStr,
$authTag,
$associatedData
);
}
throw new \RuntimeException('php7.1');
}
//信息解密
private function decryptToStringHd($associatedData, $nonceStr, $ciphertext, $aesKey = '')
{
if (empty($aesKey)) {
$aesKey = "微信证书32位v3密钥";//微信商户平台 api安全中设置获取
}
$ciphertext = \base64_decode($ciphertext);
if (strlen($ciphertext) <= self::AUTH_TAG_LENGTH_BYTE) {
return false;
}
// ext-sodium (default installed on >= PHP 7.2)
if (function_exists('\sodium_crypto_aead_aes256gcm_is_available') &&
\sodium_crypto_aead_aes256gcm_is_available()) {
return \sodium_crypto_aead_aes256gcm_decrypt($ciphertext, $associatedData, $nonceStr, $aesKey);
}
// ext-libsodium (need install libsodium-php 1.x via pecl)
if (function_exists('\Sodium\crypto_aead_aes256gcm_is_available') &&
\Sodium\crypto_aead_aes256gcm_is_available()) {
return \Sodium\crypto_aead_aes256gcm_decrypt($ciphertext, $associatedData, $nonceStr, $aesKey);
}
// openssl (PHP >= 7.1 support AEAD)
if (PHP_VERSION_ID >= 70100 && in_array('aes-256-gcm', \openssl_get_cipher_methods())) {
$ctext = substr($ciphertext, 0, -self::AUTH_TAG_LENGTH_BYTE);
$authTag = substr($ciphertext, -self::AUTH_TAG_LENGTH_BYTE);
return \openssl_decrypt($ctext, 'aes-256-gcm', $aesKey, \OPENSSL_RAW_DATA, $nonceStr,
$authTag, $associatedData);
}
throw new \RuntimeException('AEAD_AES_256_GCM需要PHP 7.1以上或者安装libsodium-php');
}
//签名验证操作
private function verify($message, $signature, $merchantPublicKey)
{
if (!in_array('sha256WithRSAEncryption', \openssl_get_md_methods(true))) {
throw new \RuntimeException("当前PHP环境不支持SHA256withRSA");
}
$signature = base64_decode($signature);
$a=openssl_verify($message, $signature, $this->getWxPublicKey($merchantPublicKey), 'sha256WithRSAEncryption');
return $a;
}
//获取平台公钥 获取平台证书序列号时存起来的cert.pem文件
protected function getWxPublicKey($key)
{
$public_content = file_get_contents($key);
$a=openssl_get_publickey($public_content);
return $a;
}
微信合单支付 jsapi支付回调就可以啦，基于v3版本！多谢支持。