Add authenticate

- Create new controller authenticate with login root..
 - Update and manage error message socket io.
 - Create enum for environment variables

back/src/Controller/AuthenticateController.ts

@@ -0,0 +1,28 @@
+import {Application, Request, Response} from "express";
+import Jwt, {JsonWebTokenError} from "jsonwebtoken";
+import {BAD_REQUEST, OK} from "http-status-codes";
+import {SECRET_KEY} from "../Enum/EnvironmentVariable";
+
+export class AuthenticateController{
+    App : Application;
+
+    constructor(App : Application) {
+        this.App = App;
+        this.login();
+    }
+
+    //permit to login on application. Return token to connect on Websocket IO.
+    login(){
+        this.App.post("/login", (req: Request, res: Response) => {
+            let param = req.body;
+            if(!param.email){
+                return res.status(BAD_REQUEST).send({
+                    message: "email parameter is empty"
+                });
+            }
+            //TODO check user email for The Coding Machine game
+            let token = Jwt.sign({email: param.email}, SECRET_KEY, {expiresIn: '24h'});
+            return res.status(OK).send({token: token});
+        });
+    }
+}