calendarimporter/php/upload.php

<?php
/**
 * upload.php, Kopano calender to ics im/exporter
 *
 * Author: Christoph Haas <christoph.h@sprinternet.at>
 * Copyright (C) 2012-2016 Christoph Haas
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

require_once("../config.php");

/* disable error printing - otherwise json communication might break... */
ini_set('display_errors', '0');

/**
 * respond/echo JSON
 * @param $arr
 */
function respondJSON($arr)
{
    echo json_encode($arr);
}

/**
 * Generates a random string with variable length.
 * @param $length the lenght of the generated string
 * @return string a random string
 */
function randomstring($length = 6)
{
    // $chars - all allowed charakters
    $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";

    srand((double)microtime() * 1000000);
    $i = 0;
    $pass = "";
    while ($i < $length) {
        $num = rand() % strlen($chars);
        $tmp = substr($chars, $num, 1);
        $pass = $pass . $tmp;
        $i++;
    }
    return $pass;
}

$destpath = PLUGIN_CALENDARIMPORTER_TMP_UPLOAD;
$destpath .= $_FILES['icsdata']['name'] . randomstring();

if (is_readable($_FILES['icsdata']['tmp_name'])) {
    $result = move_uploaded_file($_FILES['icsdata']['tmp_name'], $destpath);

    if ($result) {
        respondJSON(array('success' => true, 'ics_file' => $destpath));
    } else {
        respondJSON(array('success' => false, 'error' => dgettext("plugin_calendarimporter", "File could not be moved to TMP path! Check plugin config and folder permissions!")));
    }
} else {
    respondJSON(array('success' => false, 'error' => dgettext("plugin_calendarimporter", "File could not be read by server, upload error!")));
}