core: fix domain bind url_prefix generation

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.29.38",
+    "version": "2.29.39",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",

packages/hydrooj/src/handler/user.ts

@@ -85,7 +85,9 @@ export class UserRegisterHandler extends Handler {
             if (system.get('smtp.verify') && system.get('smtp.user')) {
                 const m = await this.renderHTML('user_register_mail.html', {
                     path: `register/${t[0]}`,
-                    url_prefix: (this.domain.host instanceof Array ? this.domain.host[0] : this.domain.host) || system.get('server.url'),
+                    url_prefix: this.domain.host
+                        ? `${this.domain.host instanceof Array ? this.domain.host[0] : this.domain.host}/`
+                        : system.get('server.url'),
                 });
                 await sendMail(mail, 'Sign Up', 'user_register_mail', m);
                 this.response.template = 'user_register_mail_sent.html';
@@ -154,7 +156,9 @@ class UserLostPassHandler extends Handler {
         );
         const m = await this.renderHTML('user_lostpass_mail.html', {
             url: `lostpass/${tid}`,
-            url_prefix: (this.domain.host instanceof Array ? this.domain.host[0] : this.domain.host) || system.get('server.url'),
+            url_prefix: this.domain.host
+                ? `${this.domain.host instanceof Array ? this.domain.host[0] : this.domain.host}/`
+                : system.get('server.url'),
             uname: udoc.uname,
         });
         await sendMail(mail, 'Lost Password', 'user_lostpass_mail', m);