Created the link controller

controller/link.js

@@ -0,0 +1,39 @@
+const Link = require('../models/Link');
+const {mongo} = require("mongoose");
+const crypto = require("crypto");
+
+// Links a new server to a user & returns the generated token
+module.exports.linkServer = async (user_id, name) => {
+    const server = await Link.create({user_id, name});
+    return server.token
+}
+
+// Get a server by id
+module.exports.getServer = async (server_id) => {
+    if (!mongo.ObjectId.isValid(server_id)) return;
+    return await Link.findById(server_id).exec();
+}
+
+// Get a server by an token
+module.exports.getServerByToken = async (token) => {
+    return await Link.findOne({token}).exec();
+}
+
+// Generates a new token for a specific server & returns it
+module.exports.regenToken = async (server_id) => {
+    if (!mongo.ObjectId.isValid(server_id)) return;
+    const token = crypto.randomBytes(48).toString('hex');
+    await Link.findByIdAndUpdate(server_id, {token}).exec();
+    return token;
+}
+
+// Lists all servers by a specific user
+module.exports.listServer = async (user_id) => {
+    return await Link.find({user_id}, {token: 0, __v: 0, user_id: 0}).exec();
+}
+
+// Sets a specific server online/offline by id
+module.exports.setServerOnline = async (server_id, online = true) => {
+    if (!mongo.ObjectId.isValid(server_id)) return;
+    await Link.findByIdAndUpdate(server_id, {online}).exec();
+}