feat: 注册限流配置

feat: 页面加载动画
feat: md样式优化
feat: 移动端全屏覆盖

src/pages/api/user/sendEmail.ts

@@ -2,13 +2,13 @@
 import type { NextApiRequest, NextApiResponse } from 'next';
 import { jsonRes } from '@/service/response';
 import { AuthCode } from '@/service/models/authCode';
-import { connectToDatabase } from '@/service/mongo';
+import { connectToDatabase, User } from '@/service/mongo';
 import { sendCode } from '@/service/utils/sendEmail';
 import { EmailTypeEnum } from '@/constants/common';
 
 export default async function handler(req: NextApiRequest, res: NextApiResponse) {
   try {
-    const { email, type } = req.query;
+    const { email, type } = req.query as { email: string; type: `${EmailTypeEnum}` };
 
     if (!email || !type) {
       throw new Error('缺少参数');
@@ -16,6 +16,16 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
 
     await connectToDatabase();
 
+    // 注册人数限流
+    if (type === EmailTypeEnum.register) {
+      const maxCount = process.env.MAX_USER ? +process.env.MAX_USER : Infinity;
+      const userCount = await User.count();
+
+      if (userCount >= maxCount) {
+        throw new Error('当前注册用户已满，请等待名额~');
+      }
+    }
+
     let code = '';
     for (let i = 0; i < 6; i++) {
       code += Math.floor(Math.random() * 10);