chore(modernize): Modernize ClientIndexController

lib/routes/client-api/client-api.json

@@ -0,0 +1,14 @@
+{
+  "version": 2,
+  "links": {
+    "feature-toggles": {
+      "uri": "/api/client/features"
+    },
+    "register": {
+      "uri": "/api/client/register"
+    },
+    "metrics": {
+      "uri": "/api/client/metrics"
+    }
+  }
+}

lib/routes/client-api/feature.js

@@ -1,14 +1,10 @@
 'use strict';
 
 const { Router } = require('express');
+const { filter } = require('./util');
 
 const version = 1;
 
-const filter = (key, value) => {
-    if (!key || !value) return array => array;
-    return array => array.filter(item => item[key].startsWith(value));
-};
-
 class FeatureController {
     constructor(config) {
         const router = Router();

lib/routes/client-api/index.js

@@ -4,27 +4,28 @@ const { Router } = require('express');
 const FeatureController = require('./feature.js');
 const metrics = require('./metrics.js');
 const register = require('./register.js');
+const clientApi = require('./client-api.json');
 
-const apiDef = {
+class ClientApi {
-    version: 2,
+    constructor(config) {
-    links: {
-        'feature-toggles': { uri: '/api/client/features' },
-        register: { uri: '/api/client/register' },
-        metrics: { uri: '/api/client/metrics' },
-    },
-};
-
-exports.apiDef = apiDef;
-
-exports.router = config => {
         const router = Router();
-    router.get('/', (req, res) => {
+        this._router = router;
-        res.json(apiDef);
-    });
 
+        router.get('/', this.index);
         router.use('/features', new FeatureController(config).router());
         router.use('/metrics', metrics.router(config));
         router.use('/register', register.router(config));
+    }
 
-    return router;
+    index(req, res) {
-};
+        res.json(clientApi);
+    }
+
+    router() {
+        return this._router;
+    }
+}
+
+ClientApi.api = clientApi;
+
+module.exports = ClientApi;

lib/routes/client-api/util.js

@@ -0,0 +1,10 @@
+'use strict';
+
+const filter = (key, value) => {
+    if (!key || !value) return array => array;
+    return array => array.filter(item => item[key].startsWith(value));
+};
+
+module.exports = {
+    filter,
+};

lib/routes/index.js

@@ -7,7 +7,7 @@ require('pkginfo')(module, 'version');
 const version = module.exports.version;
 
 const adminApi = require('./admin-api');
-const clientApi = require('./client-api');
+const ClientApi = require('./client-api');
 const FeatureController = require('./client-api/feature.js');
 
 const HealthCheckController = require('./health-check');
@@ -25,7 +25,7 @@ class IndexRouter {
         );
         router.get('/api', (req, res) => this.api(req, res));
         router.use('/api/admin', adminApi.router(config));
-        router.use('/api/client', clientApi.router(config));
+        router.use('/api/client', new ClientApi(config).router());
 
         // legacy support (remove in 4.x)
         if (config.enableLegacyRoutes) {
@@ -44,7 +44,7 @@ class IndexRouter {
                 },
                 client: {
                     uri: '/api/client',
-                    links: clientApi.apiDef.links,
+                    links: ClientApi.api.links,
                 },
             },
         });