App\Http\Controllers\ThemeController::edit PHP Method

    public function edit(Request $request, ThemeHandler $themeHandler)
    {
        $editable = session('theme.editable');
        if (!$editable) {
            return \XePresenter::make('theme.edit-auth');
        }
        $themeId = $request->get('theme');
        $fileName = $request->get('file');
        // TODO: validate themeid, fileName
        if ($themeId === null) {
            $e = new InvalidArgumentHttpException();
            $e->setMessage('잘못된 요청입니다.');
            throw $e;
        }
        $theme = \XeTheme::getTheme($themeId);
        /** @var ThemeEntityInterface $theme */
        $files = $theme->getEditFiles();
        if (empty($files)) {
            return \XePresenter::make('theme.edit', ['theme' => $theme, 'files' => $files]);
        }
        if ($fileName === null) {
            $fileName = key($files);
        }
        $filePath = realpath($files[$fileName]);
        $editFile = ['fileName' => $fileName, 'path' => $filePath];
        if ($themeHandler->hasCache($filePath)) {
            $editFile['hasCache'] = true;
            $fileContent = file_get_contents($themeHandler->getCachePath($filePath));
        } else {
            $editFile['hasCache'] = false;
            $fileContent = file_get_contents($filePath);
        }
        $editFile['content'] = $fileContent;
        return \XePresenter::make('theme.edit', ['theme' => $theme, 'files' => $files, 'editFile' => $editFile]);
    }