revert: Revert back old logic of RedirectIfAuthenticated route middleware

* We didn't remove the `RedirectIfAuthenticated` middleware instead move the logic into `RedirectIfAuthenticatedOld` middleware.

Author: ahmadhuss

app/Http/Middleware/RedirectIfAuthenticatedOld.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use App\Providers\RouteServiceProvider;
+use Closure;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+
+class RedirectIfAuthenticatedOld
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @param  string|null  ...$guards
+     * @return mixed
+     */
+    public function handle(Request $request, Closure $next, ...$guards)
+    {
+        // If you authenticated with the `normal user` then the `SessionGuard` object 'name' will be `null`
+        // and Auth::guard($guard)->check() will return TRUE
+        // and invokes the line `redirect(RouteServiceProvider::HOME)`.
+        $guards = empty($guards) ? [null] : $guards;
+
+        // Remember Auth::guard('admin') will returns a `SessionGuard` object
+        // which will use `check()` method to return boolean Is the Authenticated user is authenticated
+        // with the `admin` guard session?
+        foreach ($guards as $guard) {
+
+            // At the time of "localhost/admin/login" route the $guard will be `admin` then
+            // is_null('admin') will return false and we make this expression true. So redirection
+            // to the dashboard will automatically happen.
+
+            // But if guard session is admin & guard is null returns true then we make
+            // this false and whole expression will not RUN
+
+            // Thr expression will only run if there is explicitly guard value is present
+            if (!is_null($guard) && Auth::guard('admin')->check()) {
+                return redirect()->route('dashboard');
+            }
+
+
+            else if (Auth::guard($guard)->check()) {
+                return redirect(RouteServiceProvider::HOME);
+            }
+        }
+
+
+        // If there is not any session guard present in the request. please open the route.
+        // if (Auth::guard($guard)->check()) returns true then it means the user is
+        // authenticated with the some session guard, then $next($request) will not work.
+        return $next($request);
+    }
+}