Improved image upload

qa-wysiwyg-upload.php

<?php
/*
	Question2Answer by Gideon Greenspan and contributors
	http://www.question2answer.org/

	File: qa-plugin/wysiwyg-editor/qa-wysiwyg-upload.php
	Description: Page module class for WYSIWYG editor (CKEditor) file upload receiver


	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	More about this license: http://www.question2answer.org/license.php
*/

class qa_wysiwyg_upload
{
    public function match_request($request)
    {
        return $request === 'wysiwyg-editor-upload';
    }

    public function process_request($request)
    {
        $message = '';
        $url = '';

        if (qa_post_limit_exceeded()) {
            ob_end_clean();
            ob_clean();
            qa_initialize_buffering($request);
            $message = qa_lang('main/file_upload_limit_exceeded');
        } else {
            if (isset($_FILES['upload']) && is_array($_FILES['upload'])) {
                $fileError = $_FILES['upload']['error'];

                // Note if $_FILES['upload']['error'] === 1 then upload_max_filesize has been exceeded
                if ($fileError === 1) {
                    ob_end_clean();
                    ob_clean();
                    qa_initialize_buffering($request);
                    $message = qa_lang('main/file_upload_limit_exceeded');
                } else if ($fileError === 0 && $_FILES['upload']['size'] > 0) {
                    require_once QA_INCLUDE_DIR . 'app/limits.php';

                    if (qa_opt('wysiwyg_editor_upload_images')) {
                        require_once QA_INCLUDE_DIR . 'app/upload.php';

                        $onlyImage = qa_get('qa_only_image');
                        $upload = qa_upload_file_one(
                            qa_opt('wysiwyg_editor_upload_max_size'),
                            $onlyImage || !qa_opt('wysiwyg_editor_upload_all'),
                            $onlyImage ? 600 : null, // max width if it's an image upload
                            null // no max height
                        );

                        if (isset($upload['error'])) {
                            $message = $upload['error'];
                        } else {
                            $url = $upload['bloburl'];
                        }
                    } else {
                        $message = qa_lang('users/no_permission');
                    }
                }  // There shouldn't be any need to catch any other error
            }
        }

        echo sprintf(
            '<script>window.parent.CKEDITOR.tools.callFunction(%s, %s, %s);</script>',
            qa_js(qa_get('CKEditorFuncNum')),
            qa_js($url),
            qa_js($message)
        );

        return null;
    }
}