156 lines
4.9 KiB
PHP
156 lines
4.9 KiB
PHP
<?php
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namespace WeChatPay;
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use Exception;
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/**
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* JSAPI支付工具类
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* 实现了从微信公众平台获取code、通过code获取openid和access_token
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*/
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class JsApiTool
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{
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const GET_AUTH_CODE_URL = "https://open.weixin.qq.com/connect/oauth2/authorize";
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const GET_ACCESS_TOKEN_URL = "https://api.weixin.qq.com/sns/oauth2/access_token";
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const GET_MINIAPP_TOKEN_URL = "https://api.weixin.qq.com/sns/jscode2session";
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private $appid;
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private $appsecret;
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/**
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* 网页授权接口微信服务器返回的数据，返回样例如下
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* {
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* "access_token":"ACCESS_TOKEN",
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* "expires_in":7200,
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* "refresh_token":"REFRESH_TOKEN",
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* "openid":"OPENID",
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* "scope":"SCOPE",
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* "unionid": "o6_bmasdasdsad6_2sgVt7hMZOPfL"
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* }
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* openid是微信支付jsapi支付接口必须的参数
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* @var array
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*/
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public $data = null;
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public function __construct($appid, $appsecret)
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{
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$this->appid = $appid;
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$this->appsecret = $appsecret;
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}
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/**
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* 通过跳转获取用户的openid，跳转流程如下：
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* 1、设置自己需要调回的url及其其他参数，跳转到微信服务器
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* 2、微信服务处理完成之后会跳转回用户redirect_uri地址，此时会带上一些参数，如：code
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*
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* @return string 用户的openid
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* @throws Exception
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*/
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public function GetOpenid(): string
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{
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if (!isset($_GET['code'])) {
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$this->login();
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}
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$code = $_GET['code'];
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return $this->GetOpenidFromMp($code);
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}
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/**
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* 跳转到微信公众平台登录
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*/
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public function login()
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{
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if (function_exists('is_https')) {
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$redirect_uri = (is_https() ? 'https://' : 'http://') . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
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} else {
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$redirect_uri = ($_SERVER['SERVER_PORT'] == 443 ? 'https://' : 'http://') . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
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}
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$param = [
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"appid" => $this->appid,
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"redirect_uri" => $redirect_uri,
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"response_type" => "code",
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"scope" => "snsapi_base",
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"state" => "STATE"
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];
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$url = self::GET_AUTH_CODE_URL . '?' . http_build_query($param) . "#wechat_redirect";
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Header("Location: $url");
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exit;
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}
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/**
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* 从公众平台获取openid
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* @param string $code 微信跳转回来带上的code
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*
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* @return string openid
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* @throws Exception
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*/
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public function GetOpenidFromMp(string $code): string
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{
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$param = [
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"appid" => $this->appid,
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"secret" => $this->appsecret,
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"code" => $code,
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"grant_type" => "authorization_code"
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];
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$url = self::GET_ACCESS_TOKEN_URL . '?' . http_build_query($param);
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$res = $this->curl($url);
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$data = json_decode($res, true);
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if (isset($data['access_token']) && isset($data['openid'])) {
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$this->data = $data;
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return $data['openid'];
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} elseif (isset($data['errcode'])) {
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throw new Exception('Openid获取失败 [' . $data['errcode'] . ']' . $data['errmsg']);
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} else {
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throw new Exception('Openid获取失败，原因未知');
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}
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}
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/**
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* 微信小程序获取Openid
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* @param string $code 登录时获取的code
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*
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* @return string openid
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* @throws Exception
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*/
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public function AppGetOpenid(string $code): string
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{
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$param = [
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"appid" => $this->appid,
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"secret" => $this->appsecret,
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"js_code" => $code,
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"grant_type" => "authorization_code"
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];
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$url = self::GET_MINIAPP_TOKEN_URL . '?' . http_build_query($param);
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$res = $this->curl($url);
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$data = json_decode($res, true);
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if (isset($data['session_key']) && isset($data['openid'])) {
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$this->data = $data;
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return $data['openid'];
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} elseif (isset($data['errcode'])) {
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throw new Exception('获取openid失败 [' . $data['errcode'] . ']' . $data['errmsg']);
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} else {
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throw new Exception('获取openid失败，原因未知');
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}
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}
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/**
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* 发起GET请求
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* @param string $url 请求url
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* @return string
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*/
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private function curl(string $url): string
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{
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$ch = curl_init();
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curl_setopt($ch, CURLOPT_TIMEOUT, 6);
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curl_setopt($ch, CURLOPT_URL, $url);
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curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
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curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
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curl_setopt($ch, CURLOPT_HEADER, false);
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
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curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Linux; U; Android 4.0.4; es-mx; HTC_One_X Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0");
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$res = curl_exec($ch);
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curl_close($ch);
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return $res;
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}
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}
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