BookStack/app/Http/Middleware/CheckUserHasPermission.php

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<?php
namespace BookStack\Http\Middleware;
use Closure;
use Illuminate\Http\Request;
class CheckUserHasPermission
{
/**
* Handle an incoming request.
*
* @param \Illuminate\Http\Request $request
* @param \Closure $next
* @param $permission
*
* @return mixed
*/
public function handle($request, Closure $next, $permission)
{
if (!user()->can($permission)) {
return $this->errorResponse($request);
}
return $next($request);
}
protected function errorResponse(Request $request)
{
if ($request->wantsJson()) {
return response()->json(['error' => trans('errors.permissionJson')], 403);
}
session()->flash('error', trans('errors.permission'));
return redirect('/');
}
}