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calendar.php
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calendar.php
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<?php
/**
* This script can create a ICS appointment file or a redirect to the google calendar.
*
* Date format is "<day 2 digits>.<month 2 digits>.<year 4 digits>" (without ")
* Time format is "<hour 2 digits>:<minutes 2 digits>" (without ")
*
* Timezone can be set with $TIME_ZONE globally.
*
* Input parameter
* start-date The start date
* start-time The start time, optionally
* end-date The end date
* end-time The end time, optionally
* theme the description of the appointment, max 1024 signs long
* location the location, max 1024 signs long
* type the type can be "google" or "ics" (without ")
*
* @author https://github.com/admiralsmaster
* @url https://github.com/admiralsmaster/calendar-php
* @version 1.0
* @license MIT license http://opensource.org/licenses/MIT
*
* example:
* http://example.com/calendar.php?start-date=12.04.2014&start-time=09%3A00
* &end-date=12.04.2014&end-time=12%3A00
* &theme=Fr%C3%BChjahrsputz%202014&location=Parkeingang&type=google
* http://example.de/calendar.php?start-date=12.04.2014&end-date=12.04.2014
* &theme=Fr%C3%BChjahrsputz%202014&location=Parkeingang&type=google
* http://example.de/calendar.php?start-date=12.04.2014&end-date=12.04.2014
* &theme=Fr%C3%BChjahrsputz%202014&location=Parkeingang&type=ics
*/
//
// Configure this values
//
// this text is added to the appointment body text
static $ADD_TO_TEXT = "http://www.example.com";
// "namespace", i.e. set the name of your website
static $NAME_SPACE = "example.com";
// timezone of input values
static $TIME_ZONE = "Europe/Berlin";
// ICS file name
static $ICS_FILE = "appointment.ics";
// ICS line separator, see http://tools.ietf.org/html/rfc5545#section-3.1
static $ICS_NL = "\r\n";
date_default_timezone_set($TIME_ZONE);
// validation pattern
static $val_date = '/^\d\d\.\d\d.\d\d\d\d$/';
static $val_time = '/^\d\d:\d\d$/';
static $val_max_length = 1024;
// read in data
$startDate = $_REQUEST['start-date'];
$startTime = $_REQUEST['start-time'];
if ($startTime == null)
$startTime = "";
$endDate = $_REQUEST['end-date'];
$endTime = $_REQUEST['end-time'];
if ($endTime == null)
$endTime = "";
$theme = $_REQUEST['theme'];
$location = $_REQUEST['location'];
$type = $_REQUEST['type'];
// validation
if ($type != "ics" && $type != "google")
die ("Typ unknown");
if (!preg_match($val_date, $startDate))
die ("Format start date not valid");
if ($startTime != "" && !preg_match($val_time, $startTime))
die ("Format start time not valid");
if (!preg_match($val_date, $endDate))
die ("Format end date not valid");
if ($endTime != "" && !preg_match($val_time, $endTime))
die ("Format end time not valid");
if (strlen($theme) > $val_max_length)
die ("theme to long");
if (strlen($location) > $val_max_length)
die ("Location to long");
/**
* mask special characters for ICS.
* @param $input input string
* @return the mask string
*/
function encodeTextForIcs($input) {
return str_replace("(:|,|;|\\)", "\\$1", $input);
}
/**
* Limit the line to 75 signs for ICS format.
* @see http://tools.ietf.org/html/rfc5545#section-3.1
* @param $content the line to cut
* @return the line with needed line breaks
*/
function limitLineICS($content) {
global $ICS_NL;
$maxLenFirst = 75 - strlen($ICS_NL); // first line has a maximum length of 75 minus \r\n
$maxLenAll = 75 - strlen(" ") - strlen($ICS_NL); // further line have a maximum length of 75 minus start space and \r\n
$string = $content;
$result = substr($string, 0, $maxLenFirst) . $ICS_NL;
$string = substr($string, $maxLenFirst);
while ($string != "") {
$result .= " " . substr($string, 0, $maxLenAll) . $ICS_NL;
$string = substr($string, $maxLenAll);
}
return $result;
}
/**
* Convert a date (without time) in a date string.
* @param $date the date in format day.month.year
* @param $offsetString add an offset to the date
* @return the date string
*/
function convertToUTCDate($date, $offsetString) {
global $TIME_ZONE;
$date = date_create_from_format ("d.m.Y" , $date, timezone_open($TIME_ZONE) );
date_add($date, new DateInterval($offsetString));
// no conversion to UTC (is day only)
return date_format($date, 'Ymd');
}
/**
* Convert the date and the time in a UTC string.
* @param $date date in format day.month.year
* @param $time time in format hour:minutes
* @return UTC string
*/
function convertToUTC($date, $time) {
global $TIME_ZONE;
$date = date_create_from_format ("d.m.Y H:i" , $date . ' ' . $time, timezone_open($TIME_ZONE));
date_timezone_set($date, timezone_open('UTC'));
return date_format($date, "Ymd\THi00\Z");
}
/**
* Build the Google date pattern.
* @param $startDate start date
* @param $startTime start time
* @param $endDate end date
* @param $endTime end time
* @return the date-time string
*/
function getGoogleCalendarDate($startDate, $startTime, $endDate, $endTime) {
if ($startTime === "" || $endTime === "") {
return convertToUTCDate($startDate, 'P0D') . '/' . convertToUTCDate($endDate, 'P1D');
}
return convertToUTC($startDate, $startTime) . '/' . convertToUTC($endDate, $endTime);
}
/**
* Create a date string for ICS. If $time is an empty string the date is used only. In this case
* ";VALUE=DATE" is added to the return string. The returned string added th colon too.
* @param $date the date, required
* @param $time the time, could be an empty string
* @param $notInclusive if true and $time is not set the end day is non inclusive,
* see http://tools.ietf.org/html/rfc5545#section-3.6.1
*/
function getIcsCalendarDateWithPrefix($date, $time, $notInclusive) {
if ($time === "") {
return ";VALUE=DATE:" . convertToUTCDate($date, ($notInclusive ? 'P1D' : 'P0D'));
}
return ":" . convertToUTC($date, $time);
}
/**
* Add HTTP header for non caching.
*/
function addNonCacheHeader() {
@header('pragma: no-cache');
@header('expires: Mon, 26 Jul 1997 05:00:00 GMT');
@header('cache-control: no-store, no-cache, must-revalidate');
}
if ($type == "ics") {
$link ="BEGIN:VCALENDAR" . $ICS_NL
. "VERSION:2.0" . $ICS_NL
. "PRODID:-//" . $NAME_SPACE . "//v1.0//EN" . $ICS_NL
. "METHOD:PUBLISH" . $ICS_NL
. "BEGIN:VEVENT" . $ICS_NL
. limitLineICS("UID:" . hash_hmac("ripemd160", ($theme . $startDate), "7z5uiohoui547d9eh") . "@" . $NAME_SPACE)
. limitLineICS("LOCATION:" . encodeTextForIcs($location))
. limitLineICS("DESCRIPTION:" . encodeTextForIcs($theme) . "\\n" . encodeTextForIcs($ADD_TO_TEXT))
. limitLineICS("SUMMARY:" . encodeTextForIcs($theme))
. "CLASS:PUBLIC" . $ICS_NL
. "DTSTART" . getIcsCalendarDateWithPrefix($startDate, $startTime, false) . $ICS_NL
// DTEND is non-inclusive, is relevant if is a day only
. "DTEND" . getIcsCalendarDateWithPrefix($endDate, $endTime, true) . $ICS_NL
. "END:VEVENT" . $ICS_NL
. "END:VCALENDAR" . $ICS_NL;
header("Content-Type: text/calendar; charset=utf-8");
header("Content-Length: " . strlen($link));
header('Content-Disposition: attachment; filename="' . $ICS_FILE . '"');
header("X-Content-Type-Options: nosniff"); // trust the content type, no mime sniffing
addNonCacheHeader();
echo ($link);
}else if ($type == "google") {
$link = "https://www.google.com/calendar/event?action=TEMPLATE";
$link .= "&text=" . rawurlencode($theme);
$link .= "&dates=" . getGoogleCalendarDate($startDate, $startTime, $endDate, $endTime);
$link .= "&details=" . rawurlencode($theme) . '%0A' . rawurlencode($ADD_TO_TEXT);
$link .= "&location=" . rawurlencode($location);
$link .= "&trp=true&sprop=";
$link .= "&sprop=name:" . rawurlencode($NAME_SPACE);
header('Content-Length: ' . strlen($link));
header('Location: ' . $link, true, 303);
addNonCacheHeader();
echo $link;
}
?>