Article.php

<?php

class Article extends Base {

	function getUploadDir() {
		# e.g. something like this
		return "upload/articles/article-$this[id]";
	}
}

ArticlePresenter.php

<?php

use Nette\Application\UI,
    Nette\Forms\Controls\Button,
    Nette\Application\Responses\JsonResponse;

class ArticlePresenter extends BasePresenter {

	/** @var \Service\RedactorJsUpload */
	private $redactorJsUpload;
	
	public function injectRedactorJsUpload(\Service\RedactorJsUpload $upload) {
		$this->redactorJsUpload = $upload;
	}

	public function actionEdit($id) {
		$this->article = $this->createArticle()->find($id);
	}

	public function createComponentEdit() {
		$form = new UI\Form;
		$form->addTextArea('content', 'Content');
		$form->addSubmit('update', 'Update')->onClick[] = $this->editFormUpdate;
		return $form;
	}

	public function handleImageUpload() {
		$imageJson = $this->redactorJsUpload->imageUpload(
				$this->article->getUploadDir(),
				$this->getHttpRequest()->getFile('file')
		);
		$this->sendResponse(new JsonResponse($imageJson));
	}
	
	public function handleImagesJson() {
		$imagesJson = $this->redactorJsUpload->getImagesJson($this->article->getUploadDir());
		$this->sendResponse(new JsonResponse($imagesJson));
	}
	
	public function handleFileUpload() {
		$imageJson = $this->redactorJsUpload->fileUpload(
				$this->article->getUploadDir(),
				$this->getHttpRequest()->getFile('file')
		);
		$this->sendResponse(new JsonResponse($imageJson));
	}

}

config.neon

	services:
		redactorJsUpload: Service\RedactorJsUpload(%wwwDir%)

edit.latte

{block content}
  {form edit}
{/block}

{block pageBottom}
	<script src="{$basePath}/js/redactor/redactor.js"></script>
	<script type="text/javascript">
		$(document).ready(
			function()
			{
				$('#frmedit-content').redactor({ 
					imageUpload: {link imageUpload!},
					imageGetJson: {link imagesJson!},
					fileUpload: {link fileUpload!}
				});
			}
		);
	</script>
{/block}

RedactorJsUpload.php

<?php

namespace Service;

/**
 * RedactorJsUpload manage upload images and files for redactor.js
 *
 * @author Marek Lichtner
 */
class RedactorJsUpload {
	
	private $imagesDir = 'images';
	private $thumbSubDir = 'thumbs';
	private $filesDir = 'files';
	
	private $wwwDir, $basePath;
	
	function __construct($wwwDir, \Nette\Http\Request $request) {
		$this->wwwDir = $wwwDir;
		$this->basePath = substr($request->getUrl()->basePath, 0, -1);
	}
	
	function getImagesJson($uploadDir) {
		$imagesDir = $uploadDir . '/' . $this->imagesDir;
		$imagesJson = array();
		$path = "$this->wwwDir/$imagesDir/$this->thumbSubDir";
		foreach (glob("$path/*") as $file) {
			$filename = basename($file);
			$imagesJson[] = array(
				'thumb' => "$this->basePath/$imagesDir/$this->thumbSubDir/$filename",
				'image' => "$this->basePath/$imagesDir/$filename"
			);
		}
		return $imagesJson;
	}
	
	function imageUpload($uploadDir, \Nette\Http\FileUpload $file) {
		$imagesDir = $uploadDir . '/' . $this->imagesDir;
		$fullImageDir = "$this->wwwDir/$imagesDir";
		if (!file_exists($fullImageDir)) {
			mkdir("$fullImageDir/$this->thumbSubDir", 0777, true);
		}
		
		# move image
		$filename = strtolower($file->getSanitizedName());
		$file->move("$fullImageDir/$filename");
		
		$image = \Nette\Image::fromFile("$fullImageDir/$filename");
		# set max size
		$image->resize(1000, 700, $image::SHRINK_ONLY);
		$image->save("$fullImageDir/$filename");
		
		# create thumb 
		$image->resize(120, 120);
		$image->save("$fullImageDir/$this->thumbSubDir/$filename");
		
		return array('filelink' => "$this->basePath/$imagesDir/$filename");
	}
		
	
	function fileUpload($uploadDir, \Nette\Http\FileUpload $file) {
		$filesDir = $uploadDir . '/' . $this->filesDir;
		$fullFilesDir = "$this->wwwDir/$filesDir";
		if (!file_exists($fullFilesDir)) {
			mkdir("$fullFilesDir", 0777, true);
		}
		
		# move file
		$filename = strtolower($file->getSanitizedName());
		$file->move("$fullFilesDir/$filename");
		
		return array('filelink' => "$this->basePath/$filesDir/$filename");
	}
	
}