BookStack/app/Http/Controllers/Controller.php

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<?php
namespace BookStack\Http\Controllers;
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use BookStack\Auth\User;
use BookStack\Ownable;
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use Illuminate\Foundation\Bus\DispatchesJobs;
use Illuminate\Foundation\Validation\ValidatesRequests;
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use Illuminate\Http\Exceptions\HttpResponseException;
use Illuminate\Http\Request;
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use Illuminate\Routing\Controller as BaseController;
abstract class Controller extends BaseController
{
use DispatchesJobs, ValidatesRequests;
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/**
* @var User static
*/
protected $currentUser;
/**
* @var bool
*/
protected $signedIn;
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/**
* Controller constructor.
*/
public function __construct()
{
$this->middleware(function ($request, $next) {
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// Get a user instance for the current user
$user = user();
// Share variables with controllers
$this->currentUser = $user;
$this->signedIn = auth()->check();
// Share variables with views
view()->share('signedIn', $this->signedIn);
view()->share('currentUser', $user);
return $next($request);
});
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}
/**
* Stops the application and shows a permission error if
* the application is in demo mode.
*/
protected function preventAccessForDemoUsers()
{
if (config('app.env') === 'demo') {
$this->showPermissionError();
}
}
/**
* Adds the page title into the view.
* @param $title
*/
public function setPageTitle($title)
{
view()->share('pageTitle', $title);
}
/**
* On a permission error redirect to home and display.
* the error as a notification.
*/
protected function showPermissionError()
{
if (request()->wantsJson()) {
$response = response()->json(['error' => trans('errors.permissionJson')], 403);
} else {
$response = redirect('/');
session()->flash('error', trans('errors.permission'));
}
throw new HttpResponseException($response);
}
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/**
* Checks for a permission.
* @param string $permissionName
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* @return bool|\Illuminate\Http\RedirectResponse
*/
protected function checkPermission($permissionName)
{
if (!user() || !user()->can($permissionName)) {
$this->showPermissionError();
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}
return true;
}
/**
* Check the current user's permissions against an ownable item.
* @param $permission
* @param Ownable $ownable
* @return bool
*/
protected function checkOwnablePermission($permission, Ownable $ownable)
{
if (userCan($permission, $ownable)) {
return true;
}
return $this->showPermissionError();
}
/**
* Check if a user has a permission or bypass if the callback is true.
* @param $permissionName
* @param $callback
* @return bool
*/
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protected function checkPermissionOr($permissionName, $callback)
{
$callbackResult = $callback();
if ($callbackResult === false) {
$this->checkPermission($permissionName);
}
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return true;
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}
/**
* Send back a json error message.
* @param string $messageText
* @param int $statusCode
* @return mixed
*/
protected function jsonError($messageText = "", $statusCode = 500)
{
return response()->json(['message' => $messageText], $statusCode);
}
/**
* Create the response for when a request fails validation.
* @param \Illuminate\Http\Request $request
* @param array $errors
* @return \Symfony\Component\HttpFoundation\Response
*/
protected function buildFailedValidationResponse(Request $request, array $errors)
{
if ($request->expectsJson()) {
return response()->json(['validation' => $errors], 422);
}
return redirect()->to($this->getRedirectUrl())
->withInput($request->input())
->withErrors($errors, $this->errorBag());
}
/**
* Create a response that forces a download in the browser.
* @param string $content
* @param string $fileName
* @return \Illuminate\Http\Response
*/
protected function downloadResponse(string $content, string $fileName)
{
return response()->make($content, 200, [
'Content-Type' => 'application/octet-stream',
'Content-Disposition' => 'attachment; filename="' . $fileName . '"'
]);
}
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}