+/**
+ * Get the path to a versioned file.
+ *
+ * @param string $file
+ * @return string
+ * @throws Exception
+ */
+function versioned_asset($file = '')
+{
+ static $version = null;
+
+ if (is_null($version)) {
+ $versionFile = base_path('version');
+ $version = trim(file_get_contents($versionFile));
+ }
+
+ $additional = '';
+ if (config('app.env') === 'development') {
+ $additional = sha1_file(public_path($file));
+ }
+
+ $path = $file . '?version=' . urlencode($version) . $additional;
+ return baseUrl($path);
+}
+
+/**
+ * Helper method to get the current User.
+ * Defaults to public 'Guest' user if not logged in.
+ * @return \BookStack\User
+ */
+function user()
+{
+ return auth()->user() ?: \BookStack\User::getDefault();
+}
+
+/**
+ * Check if current user is a signed in user.
+ * @return bool
+ */
+function signedInUser()
+{
+ return auth()->user() && !auth()->user()->isDefault();
+}
+
+/**
+ * Check if the current user has a permission.
+ * If an ownable element is passed in the jointPermissions are checked against
+ * that particular item.
+ * @param $permission
+ * @param Ownable $ownable
+ * @return mixed
+ */
+function userCan($permission, Ownable $ownable = null)
+{
+ if ($ownable === null) {
+ return user() && user()->can($permission);
+ }
+
+ // Check permission on ownable item
+ $permissionService = app(\BookStack\Services\PermissionService::class);
+ return $permissionService->checkOwnableUserAccess($ownable, $permission);
+}
+
+/**
+ * Helper to access system settings.
+ * @param $key
+ * @param bool $default
+ * @return bool|string|\BookStack\Services\SettingService
+ */
+function setting($key = null, $default = false)
+{
+ $settingService = resolve(\BookStack\Services\SettingService::class);
+ if (is_null($key)) {
+ return $settingService;
+ }
+ return $settingService->get($key, $default);
+}
+
+/**
+ * Helper to create url's relative to the applications root path.
+ * @param string $path
+ * @param bool $forceAppDomain
+ * @return string
+ */
+function baseUrl($path, $forceAppDomain = false)
+{
+ $isFullUrl = strpos($path, 'http') === 0;
+ if ($isFullUrl && !$forceAppDomain) {
+ return $path;
+ }
+ $path = trim($path, '/');
+
+ // Remove non-specified domain if forced and we have a domain
+ if ($isFullUrl && $forceAppDomain) {
+ $explodedPath = explode('/', $path);
+ $path = implode('/', array_splice($explodedPath, 3));
+ }
+
+ // Return normal url path if not specified in config
+ if (config('app.url') === '') {
+ return url($path);
+ }
+
+ return rtrim(config('app.url'), '/') . '/' . $path;
+}
+
+/**
+ * Get an instance of the redirector.
+ * Overrides the default laravel redirect helper.
+ * Ensures it redirects even when the app is in a subdirectory.
+ *
+ * @param string|null $to
+ * @param int $status
+ * @param array $headers
+ * @param bool $secure
+ * @return \Illuminate\Routing\Redirector|\Illuminate\Http\RedirectResponse
+ */
+function redirect($to = null, $status = 302, $headers = [], $secure = null)
+{
+ if (is_null($to)) {
+ return app('redirect');
+ }
+
+ $to = baseUrl($to);