feat: 接入微信小程序支付

miniprogram/pages/wechat-pay/index.js

@@ -0,0 +1,83 @@
+function parsePayParams(rawValue) {
+  try {
+    const params = JSON.parse(decodeURIComponent(String(rawValue || '')));
+    if (!params || typeof params !== 'object') {
+      return null;
+    }
+    return params;
+  } catch (error) {
+    console.error('[wechat-pay] parse params failed', error);
+    return null;
+  }
+}
+
+function requestPayment(payParams) {
+  return new Promise((resolve) => {
+    wx.requestPayment({
+      timeStamp: String(payParams.timeStamp || ''),
+      nonceStr: String(payParams.nonceStr || ''),
+      package: String(payParams.package || ''),
+      signType: payParams.signType || 'RSA',
+      paySign: String(payParams.paySign || ''),
+      success() {
+        resolve('success');
+      },
+      fail(error) {
+        const errMsg = error && error.errMsg ? error.errMsg : '';
+        resolve(/cancel/i.test(errMsg) ? 'cancel' : 'fail');
+      },
+    });
+  });
+}
+
+function appendPayResult(url, requestId, status) {
+  const value = `${requestId}:${status}`;
+  const hashIndex = String(url || '').indexOf('#');
+  const baseUrl =
+    hashIndex >= 0 ? String(url).slice(0, hashIndex) : String(url || '');
+  const rawHash = hashIndex >= 0 ? String(url).slice(hashIndex + 1) : '';
+  const params = new URLSearchParams(rawHash);
+  params.set('wx_pay_result', value);
+  return `${baseUrl}#${params.toString()}`;
+}
+
+function notifyPreviousWebView(requestId, status) {
+  const pages = getCurrentPages();
+  const previousPage = pages.length >= 2 ? pages[pages.length - 2] : null;
+  if (previousPage && typeof previousPage.setData === 'function') {
+    previousPage.setData({
+      webViewUrl: appendPayResult(
+        previousPage.data.webViewUrl,
+        requestId,
+        status,
+      ),
+    });
+  }
+}
+
+Page({
+  data: {
+    title: '正在拉起支付',
+    errorMessage: '',
+  },
+
+  async onLoad(query) {
+    const requestId = String(query.requestId || '');
+    const payParams = parsePayParams(query.payParams);
+    if (!requestId || !payParams) {
+      this.setData({
+        title: '支付失败',
+        errorMessage: '缺少支付参数。',
+      });
+      return;
+    }
+
+    const status = await requestPayment(payParams);
+    notifyPreviousWebView(requestId, status);
+    wx.navigateBack();
+  },
+
+  handleBack() {
+    wx.navigateBack();
+  },
+});