Controller/FileController.php
public function tinymceUploadAction(Request $request)
    {
        // TODO check admin ?

        if (!$request->isXmlHttpRequest()) {
            throw new NotFoundHttpException();
        }

        $name = $request->request->get('name');
        $base64 = $request->request->get('data');

        $filename = md5(time().uniqid()).".jpg";
        $data = explode(',', $base64);
        if (2 != count($data)) {
            throw new \InvalidArgumentException('Invalid image data.');
        }

        $fs = $this->get('local_tinymce_filesystem');
        if (!$fs->put($filename, base64_decode($data[1]))) {
            throw new \Exception('Failed to create image.');
        }

        return new JsonResponse([
            'location' => '/tinymce/' . $filename,
        ]);
    }
public function tinymceUploadAction(Request $request)
    {
        // TODO check admin ?

        if (!$request->isXmlHttpRequest()) {
            throw new NotFoundHttpException();
        }

        $name = $request->request->get('name');
        $base64 = $request->request->get('data');

        $filename = md5(time().uniqid()).".jpg";
        $data = explode(',', $base64);
        if (2 != count($data)) {
            throw new \InvalidArgumentException('Invalid image data.');
        }

        $fs = $this->get('local_tinymce_filesystem');
        if (!$fs->put($filename, base64_decode($data[1]))) {
            throw new \Exception('Failed to create image.');
        }

        return new JsonResponse([
            'location' => '/tinymce/' . $filename,
        ]);
    }
Handle tinymce upload.

@param Request $request
@return JsonResponse
@throws \Exception