fix: serverless adapter binary body support, hide phone number in register

- Keep body as Buffer instead of utf8 string for multipart/form-data
- Set content-length header for multer compatibility
- Phone authorization shows '已授权' instead of actual number

miniprogram/pages/register/register.js

@@ -57,7 +57,7 @@ Page({
     http.post('/api/v1/user/phone', { code: e.detail.code }).then(function (data) {
       self.setData({
         loading: false,
-        phone: data.phone || data.pure_phone_number || '已授权'
+        phone: '已授权'
       })
       wx.showToast({ title: '手机号授权成功', icon: 'success' })
     }).catch(function (err) {

server/src/lib/serverless.js

@@ -10,7 +10,11 @@ module.exports = function serverless(app) {
     const url = path + (qsStr ? '?' + qsStr : '')
 
     let rawBody = event.body || ''
-    if (event.isBase64Encoded && rawBody) rawBody = Buffer.from(rawBody, 'base64').toString('utf8')
+    if (event.isBase64Encoded && rawBody) {
+      rawBody = Buffer.from(rawBody, 'base64')
+    } else if (typeof rawBody === 'string') {
+      rawBody = Buffer.from(rawBody, 'utf8')
+    }
 
     return new Promise((resolve) => {
       const req = new http.IncomingMessage()
@@ -21,6 +25,9 @@ module.exports = function serverless(app) {
       if (event.requestContext && event.requestContext.sourceIp) {
         req.headers['x-forwarded-for'] = req.headers['x-forwarded-for'] || event.requestContext.sourceIp
       }
+      if (rawBody.length > 0) {
+        req.headers['content-length'] = String(rawBody.length)
+      }
 
       const res = new http.ServerResponse(req)
       let body = ''
@@ -52,7 +59,7 @@ module.exports = function serverless(app) {
 
       res.write = function (chunk) { body += chunk }
 
-      if (rawBody) {
+      if (rawBody.length > 0) {
         req.push(rawBody)
       }
       req.push(null)