core/app/Http/Controllers/Admin/Contents/EditContent.php

<?php
namespace App\Http\Controllers\Admin\Contents;

use App\CMS\Enumerations\ContentStatuses;
use App\Cms\Handlers\Interactions\Interaction;
use App\CMS\Helpers\CurrentTemplate;
use App\Cms\Interactions\Admin\Content\EditContent as EditContentInteraction;
use App\Events\AttemptToEditInvalidContent;
use App\Http\Controllers\Admin\Controller;
use App\Http\Requests\EditContentRequest;
use App\Http\Requests\Request;
use App\Models\Content\Content;
use App\Models\Content\ContentHistory;
use App\Models\FileManager\File;
use App\Models\Module;
use App\Models\Templates\Template;
use Illuminate\Support\Facades\Event;
use Modules\Categories\Entities\Category;
use Pingpong\Modules\Facades\Module as ModuleInstance;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

class EditContent extends Controller
{
    /**
     * @var ContentHistory
     */
    private $history;
    /**
     * @var File
     */
    private $file;

    /**
     * EditContent constructor.
     *
     * Load ContentHistory and File into this controller
     *
     * @param ContentHistory $history
     * @param File           $file
     */
    public function __construct(ContentHistory $history, File $file)
    {
        $this->history = $history;
        $this->file = $file;
    }

    /**
     * Display form for editing static page
     *
     * @param $id
     *
     * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View
     */
    public function edit($id)
    {
        // select all content statuses
        $statuses = ContentStatuses::getWithTranslations();

        // try to find requested page
        $page = Content::findOrFail($id);
        $page->module_settings = json_decode($page->module_settings);

        // get module ID
        $module = Module::where('handler', $page->module_handler)
                        ->firstOrFail();

        $pageHeading = trans('admin/contents.edit', ['name' => e($page->title)]);
        if (is_callable([$module->handler, 'getEditTitle'])) {
            $pageHeading = call_user_func([$module->handler, 'getEditTitle'], $page);
        }

        // get all Blade templates for rendering page
        $templates = Template::where('module_id', $module->id)
                             ->select(['template_name', 'name', 'description'])
                             ->get();

        // get module for Categories - PingPong module
        $categoryModule = ModuleInstance::get('categories');

        // add categories, if supported
        $categories = [];
        if ($module->support_categories && !is_null($categoryModule) && $categoryModule->enabled()) {
            $categories = Category::where('module_id', $module->id)
                                  ->get();
        }

        // modify data for edit form according to installed template
        call_user_func_array([CurrentTemplate::handler(), 'beforePopulatingEditForm'], [&$page]);

        $history = $this->history->getStructuredHistoryOf($page);

        // render view
        return view('admin.content.edit', [
            'pageHeading'      => $pageHeading,
            'contentStatuses'  => $statuses,
            'page'             => $page,
            'module'           => $module,
            'categories'       => $categories,
            'rootPages'        => $page->getOverview()
                                       ->where('contents.id', '!=', $page->id)
                                       ->get(),
            'templates'        => $templates,
            'extraData'        => call_user_func([$page->module_handler, 'loadExtraData'], $page),
            'formSectionNames' => call_user_func([$page->module_handler, 'getExtendedFormSections']),
            'formSections'     => call_user_func([$page->module_handler, 'getExtendedFormInputsEdit']),
            'historySize'      => count($history['changesets'])
        ]);
    }

    /**
     * Edit static page and save changes into history.
     *
     * @param EditContentRequest    $request
     * @param                       $id
     *
     * @return \Illuminate\Http\RedirectResponse
     */
    public function update(Request $request, $id)
    {
        try {
            /**
             * @var $page Content
             */
            $page = Content::findOrFail($id);
        } catch (NotFoundHttpException $e) {

            // log attempt of invalid edit
            Event::fire(new AttemptToEditInvalidContent($id));

            // page for editing not found
            return redirect()
                ->route('content.overview')
                ->with('error', trans('admin/contents.invalidPage'));
        }

        // edit page
        list($page, $revision, $changedColumns) = Interaction::handle($request, new EditContentInteraction(), $page);

        // was something changed?
        if ($changedColumns == 0) {
            return redirect()
                ->route('content.edit', ['id' => $page->id])
                ->with('error', trans('admin/contents.nothingToEdit'));
        }

        // something was changed, inform user
        return redirect()
            ->route('content.overview')
            ->with('success', trans('admin/contents.successfullyEdited'));
    }

    /**
     * Convert object of all request data into array of only wanted fields
     *
     * @param Request $request
     * @param         $fields
     *
     * @return array
     */
    public static function getFields(Request $request, $fields)
    {
        $requestData = [];

        foreach ($fields as $field) {
            $requestData[$field] = $request->$field;
        }

        return $requestData;
    }
}