Fix protocol in Email.

modules/api.js

@@ -42,7 +42,8 @@ app.post('/api/forget', async (req, res) => {
       expiresIn: '12h'
     });
 
-    const vurl = req.protocol + '://' + req.get('host') + syzoj.utils.makeUrl(['api', 'forget_confirm'], { token: token });
+    const currentProto = req.get("X-Forwarded-Proto") || req.protocol;
+    const vurl = currentProto + '://' + req.get('host') + syzoj.utils.makeUrl(['api', 'forget_confirm'], { token: token });
     try {
       await Email.send(user.email,
         `${user.username} 的 ${syzoj.config.title} 密码重置邮件`,
@@ -92,7 +93,8 @@ app.post('/api/sign_up', async (req, res) => {
         expiresIn: '2d'
       });
 
-      const vurl = req.protocol + '://' + req.get('host') + syzoj.utils.makeUrl(['api', 'sign_up_confirm'], { token: token });
+      const currentProto = req.get("X-Forwarded-Proto") || req.protocol;
+      const vurl = currentProto + '://' + req.get('host') + syzoj.utils.makeUrl(['api', 'sign_up_confirm'], { token: token });
       try {
         await Email.send(req.body.email,
           `${req.body.username} 的 ${syzoj.config.title} 注册验证邮件`,