add: 生成二维码工具

package.json

@@ -15,6 +15,7 @@
     "lint": "vue-cli-service lint"
   },
   "dependencies": {
+    "@types/qr-image": "^3.2.4",
     "axios": "^0.21.1",
     "core-js": "^3.6.5",
     "dayjs": "^1.10.6",
@@ -28,6 +29,7 @@
     "koa-static": "^5.0.0",
     "koa-views": "^7.0.1",
     "moment": "^2.29.1",
+    "qr-image": "^3.2.0",
     "request": "^2.88.2",
     "uglifyjs-webpack-plugin": "^2.2.0",
     "uuid": "^8.3.2",

server/controllers/qr-code.js

+const qr = require('qr-image');
+
+exports.gen_qr_code = async (ctx) => {
+    
+    const url = ctx.query.url;
+
+    try {
+        let img = qr.image(decodeURIComponent(url));
+      
+        ctx.type= 'image/png';
+        ctx.body = img;
+    } catch (e) {
+        ctx.type='text/html;charset=utf-8';
+        ctx.body='<h1>414 Request-URI Too Large</h1>';
+    }
+};

server/router.js

@@ -9,12 +9,14 @@ const goods = require('./controllers/goods');
 const activity = require('./controllers/activity');
 const withdrawal = require('./controllers/withdrawal');
 const groupmeal = require('./controllers/groupmeal');
+const qr_code = require('./controllers/qr-code');
 
 const router = Router();
 const API_VERSION = "/api/v1";
 
 router.get(/^\/op.*/, static.index)
 
+router.get(`${API_VERSION}/qr_code`, qr_code.gen_qr_code);
 router.get(`${API_VERSION}/fetch_user`, system.fetch_user);
 router.get(`${API_VERSION}/user/:type`, user.query)
 router.post(`${API_VERSION}/J_login`, system.J_login);