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<?php
/**
* Controller for ical output of users own shifts or any user_shifts filter.
*/
function user_ical()
{
global $user;
if (!isset($_REQUEST['key']) || !preg_match('/^[0-9a-f]{32}$/', $_REQUEST['key'])) {
engelsystem_error('Missing key.');
}
$key = $_REQUEST['key'];
$user = User_by_api_key($key);
if ($user == null) {
engelsystem_error('Key invalid.');
}
if (!in_array('ical', privileges_for_user($user['UID']))) {
engelsystem_error('No privilege for ical.');
}
$ical_shifts = load_ical_shifts();
send_ical_from_shifts($ical_shifts);
}
/**
* Renders an ical calender from given shifts array.
*
* @param array <Shift> $shifts
*/
function send_ical_from_shifts($shifts)
{
header('Content-Type: text/calendar; charset=utf-8');
header('Content-Disposition: attachment; filename=shifts.ics');
$output = "BEGIN:VCALENDAR\r\nVERSION:2.0\r\nPRODID:-//-//Engelsystem//DE\r\nCALSCALE:GREGORIAN\r\n";
foreach ($shifts as $shift) {
$output .= make_ical_entry_from_shift($shift);
}
$output .= "END:VCALENDAR\r\n";
$output = trim($output, "\x0A");
header('Content-Length: ' . strlen($output));
raw_output($output);
}
/**
* Renders an ical vevent from given shift.
*
* @param array $shift
* @return string
*/
function make_ical_entry_from_shift($shift)
{
$output = "BEGIN:VEVENT\r\n";
$output .= 'UID:' . md5($shift['start'] . $shift['end'] . $shift['name']) . "\r\n";
$output .= 'SUMMARY:' . str_replace("\n", "\\n", $shift['name'])
. ' (' . str_replace("\n", "\\n", $shift['title']) . ")\r\n";
if (isset($shift['Comment'])) {
$output .= 'DESCRIPTION:' . str_replace("\n", "\\n", $shift['Comment']) . "\r\n";
}
$output .= 'DTSTART;TZID=Europe/Berlin:' . date("Ymd\THis", $shift['start']) . "\r\n";
$output .= 'DTEND;TZID=Europe/Berlin:' . date("Ymd\THis", $shift['end']) . "\r\n";
$output .= 'LOCATION:' . $shift['Name'] . "\r\n";
$output .= "END:VEVENT\r\n";
return $output;
}
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