Laravel: how to check middleware in blade template - laravel

Question

i've created Middleware
php artisan make:middleware isTeacher
in App/Http/isTeacher.php i've placed the check:
namespace App\Http\Middleware;
use Closure;
use Illuminate\Support\Facades\Auth;
class isTeacher
{
public function handle($request, Closure $next)
{
$user = Auth::user();
if($user && $user->capability == 3)
{
return $next($request);
}
else
return redirect('/login');
}
}
than, i've defined the middleware in app/Http/Kernel.php
protected $routeMiddleware = [
...
'auth.teacher' => \App\Http\Middleware\isTeacher::class,
...
];
The question is: how I check the teacher capability in blade template?
I'm trying with this:
#if (Auth::isTeacher())
but doesn't work
any help are appreciated

Answer 1

The blade directive only needs to return true or false, nothing else.
You could just do the following in the boot() method of the AppServiceProvider.php
Blade::if('teacher', function () {
return auth()->user() && $user->capability == 3;
});
Then you will be able to do the following in blade templates:
#teacher
Only teachers will see this
#endteacher

Answer 2

Well there is an issue here Middlewares are used to filter HTTP requests or its outter layer of the onion in laravel app. It is not defined to be used in blade to decide which part of html should be rendered.
You can filter a controller function to only be usable if it passes the middleware (if authenticated for example) and the controller only runs the function if it passes on the middleware.
When using Auth in blades you are not using a middleware but a facade whan you could do its use Session for your case like:
In your middleware
namespace App\Http\Middleware;
use Closure;
use Illuminate\Support\Facades\Auth;
class isTeacher
{
public function handle($request, Closure $next)
{
$user = Auth::user();
if($user && $user->capability == 3)
{
\session('isTeacher', true);
return $next($request);
}
return redirect('/login');
}
Then in your blades do like:
#if (Session::get('isTeacher', 0));
This will show content only to teachers, if session its not set it will fall back to 0 or false.

Answer 3

In this scenario, using middleware is not really the solution. I will rather suggest blade directive, which allows you to create a custom blade function like:
#author
//Do something
#else
//Something else
#endauthor
To use the above syntax, you can register a new blade directive in your AppServiceProvider.php file
<?php
namespace App\Providers;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Blade;
use Illuminate\Support\ServiceProvider;
class AppServiceProvider extends ServiceProvider
{
public function boot()
{
Blade::directive('author', function () {
$isAuth = false;
// check if the user authenticated is teacher
if (auth()->user() && auth()->user()->capability == 3) {
$isAuth = true;
}
return "<?php if ($isAuth) { ?>";
});
Blade::directive('endauthor', function () {
return "<?php } ?>";
});
}
}
After the above changes in the AppServiceProvider.php file, run php artisan view:clear
For a better understanding, you can refer to the documentation here

Answer 4

This is an improved version of Prince Lionel's answer. Pay attention to the return value of Blade::directive callback function.
#author
//Do something
#else
//Something else
#endauthor
AppServiceProvider.php
namespace App\Providers;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Blade;
use Illuminate\Support\ServiceProvider;
class AppServiceProvider extends ServiceProvider
{
public function boot()
{
Blade::directive('author', function () {
$isAuth = false;
// check if the user authenticated is teacher
if (auth()->user() && auth()->user()->capability == 3) {
$isAuth = true;
}
return "<?php if (" . intval($isAuth) . ") { ?>";
});
Blade::directive('endauthor', function () {
return "<?php } ?>";
});
}
}