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Incoming: Bennu library to be used for iCal imports/exports.

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Bennu - An object-oriented iCalendar (RFC2445) implementation in PHP
http://bennu.sourceforge.net
Bennu is copyright (C) 2005 by Ioannis Papaioannou (pj@moodle.org).
The full text of the LGLP license is included in LICENSE.txt
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.
51 Franklin St, Fifth Floor
Boston, MA 02110-1301 USA

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GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999
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lib/bennu/README.txt Normal file

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Bennu - An object-oriented iCalendar (RFC2445) implementation in PHP
http://bennu.sourceforge.net
Bennu is copyright (C) 2005 by Ioannis Papaioannou (pj@moodle.org).
=======================================================================
TABLE OF CONTENTS
=======================================================================
1. About Bennu
1.1. What is Bennu?
1.2. What is iCalendar?
1.3. Bennu license
2. Using Bennu
2.1. Integrating Bennu in your application
2.2. Usage examples
3. Bugs and limitations
3.1. Known limitations
4. Contact information
=======================================================================
-----------------------------------------------------------------------
1. About Bennu
-----------------------------------------------------------------------
1.1. What is Bennu?
Bennu is a software library written in PHP that implements the
functionality of the IETF iCalendar 2.0 specification (RFC 2445).
Its purpose is to enable applications which have an interest in
this format (e.g. calendaring, scheduler and organizer programs)
to support iCalendar in an easy, powerful, and extensible way.
In other words, Bennu exists so that developers working on such
applications don't have to waste painful hours going through the
standard and writing the code to implement it. Instead, they can
include this library in their application and get to the fun part
already: coding THEIR program.
1.2. What is iCalendar?
The iCalendar specification is a result of the work of the IETF
(Internet Engineering Task Force), Calendaring and Scheduling
Working Group. It was authored by Frank Dawson of Lotus
Development Corporation and Derik Stenerson of Microsoft
Corporation. iCalendar is heavily based on the earlier vCalendar
industry specification by the Internet Mail Consortium (IMC),
which it extends and seeks to replace.
In practical terms, iCalendar is the number one format used today
by calendaring and scheduler applications to import and export
data. Applications which provide support for iCalendar include:
* Microsoft Outlook
* Apple iCal
* Mozilla Calendar (and Mozilla Sunbird)
* Mulberry
* Korganizer
* Ximian Evolution
Effectively, this means that iCalendar is akin to a "common
language" which all these applications speak. If you are writing
an application which includes scheduling or calendaring elements,
and you want it to be able to synchronize with other such
programs, you need to support iCalendar. Bennu is an easy way to
do exactly that, as long as you are coding in PHP.
1.3. Bennu license
Bennu is released under the GNU Lesser General Public License
(LGPL). In short, this means that:
* You are allowed to distribute and/or modify the source code of
Bennu
* You are allowed to use Bennu or any modified version of it in a
commercial application
* You do not have to pay any fees to use, modify, or distribute
Bennu
* You can charge others for distributing Bennu or derived versions
* However, in ALL OF THE ABOVE CASES, you MUST provide the source
code for Bennu (or any modified version you may have produced),
and that source code MUST be provided under the GNU GPL -or- the
GNU LGPL license. Furthermore, you MUST include the original
copyright notices and credits that you received the source code
with when you distribute it INTACT.
* In any case, the copyright to Bennu is retained by me,
Ioannis Papaioannou.
##################
## DISCLAIMER ##
##################
Please be advised that the above is a very short and to the point
explanation of the GNU LGPL terms, as I understand it, and it is
only my personal opinion. IT IS NOT THE ACTUAL LICENSE UNDER WHICH
BENNU IS RELEASED. It is STRONGLY RECOMMENDED that you read the
full text of the LGPL in order to avoid any misunderstandings
which may be caused by reading my interpretation of it. You can
find the full text of the LGPL in the file LICENSE.TXT, which you
must have received as part of the Bennu distribution. If you have
not received such a file, please email me mentioning where you
obtained your copy of Bennu.
-----------------------------------------------------------------------
2. Using Bennu
-----------------------------------------------------------------------
2.1. Integrating Bennu in your application
To include Bennu in your application, you only need to include one
PHP file, like this:
<?php
include($path_to_bennu.'/library/lib/bennu.inc.php');
// the rest of your code goes here
?>
2.2. Usage examples
Please look at the /examples/ directory for ready-to-run examples
illustrating how Bennu is to be used. This section will be
revisited and properly written when the source code reaches an
acceptable level of features and meturity (no, I don't know when
that will be).
-----------------------------------------------------------------------
3. Bugs and limitations
-----------------------------------------------------------------------
3.1. Known limitations
* LANGUAGE property parameters aren't semantically checked.
-----------------------------------------------------------------------
4. Contact information
-----------------------------------------------------------------------
You can contact me at the email address pj@moodle.org for any
suggestions, ideas, or bug reports regarding Bennu.
At some point there will also be a site which you can use to do
anything related to Bennu, but sadly not today. If you want to
volunteer and give a hand, I 'll be happy to collaborate.

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lib/bennu/TODO.txt Normal file

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* Take a look at all those text values. Control chars shouldn't be allowed.

59
lib/bennu/bennu.class.php Normal file

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<?php // $Id$
/**
* BENNU - PHP iCalendar library
* (c) 2005-2006 Ioannis Papaioannou (pj@moodle.org). All rights reserved.
*
* Released under the LGPL.
*
* See http://bennu.sourceforge.net/ for more information and downloads.
*
* @author Ioannis Papaioannou
* @version $Id$
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
class Bennu {
function timestamp_to_datetime($t = NULL) {
if($t === NULL) {
$t = time();
}
return gmstrftime('%Y%m%dT%H%M%SZ', $t);
}
function generate_guid() {
// Implemented as per the Network Working Group draft on UUIDs and GUIDs
// These two octets get special treatment
$time_hi_and_version = sprintf('%02x', (1 << 6) + mt_rand(0, 15)); // 0100 plus 4 random bits
$clock_seq_hi_and_reserved = sprintf('%02x', (1 << 7) + mt_rand(0, 63)); // 10 plus 6 random bits
// Need another 14 random octects
$pool = '';
for($i = 0; $i < 7; ++$i) {
$pool .= sprintf('%04x', mt_rand(0, 65535));
}
// time_low = 4 octets
$random = substr($pool, 0, 8).'-';
// time_mid = 2 octets
$random .= substr($pool, 8, 4).'-';
// time_high_and_version = 2 octets
$random .= $time_hi_and_version.substr($pool, 12, 2).'-';
// clock_seq_high_and_reserved = 1 octet
$random .= $clock_seq_hi_and_reserved;
// clock_seq_low = 1 octet
$random .= substr($pool, 13, 2).'-';
// node = 6 octets
$random .= substr($pool, 14, 12);
return $random;
}
}
?>

25
lib/bennu/bennu.inc.php Normal file

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<?php // $Id$
/**
* BENNU - PHP iCalendar library
* (c) 2005-2006 Ioannis Papaioannou (pj@moodle.org). All rights reserved.
*
* Released under the LGPL.
*
* See http://bennu.sourceforge.net/ for more information and downloads.
*
* @author Ioannis Papaioannou
* @version $Id$
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
if(!defined('_BENNU_VERSION')) {
define('_BENNU_VERSION', '0.1');
include('bennu.class.php');
include('iCalendar_rfc2445.php');
include('iCalendar_components.php');
include('iCalendar_properties.php');
include('iCalendar_parameters.php');
}
?>

410
lib/bennu/iCalendar_components.php Normal file

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<?php // $Id$
/**
* BENNU - PHP iCalendar library
* (c) 2005-2006 Ioannis Papaioannou (pj@moodle.org). All rights reserved.
*
* Released under the LGPL.
*
* See http://bennu.sourceforge.net/ for more information and downloads.
*
* @author Ioannis Papaioannou
* @version $Id$
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
class iCalendar_component {
var $name = NULL;
var $properties = NULL;
var $components = NULL;
var $valid_properties = NULL;
var $valid_components = NULL;
function iCalendar_component() {
$this->construct();
}
function construct() {
// Initialize the components array
if(empty($this->components)) {
$this->components = array();
foreach($this->valid_components as $name) {
$this->components[$name] = array();
}
}
}
function get_name() {
return $this->name;
}
function add_property($name, $value = NULL, $parameters = NULL) {
// Uppercase first of all
$name = strtoupper($name);
// Are we trying to add a valid property?
$xname = false;
if(!isset($this->valid_properties[$name])) {
// If not, is it an x-name as per RFC 2445?
if(!rfc2445_is_xname($name)) {
return false;
}
// Since this is an xname, all components are supposed to allow this property
$xname = true;
}
// Create a property object of the correct class
if($xname) {
$property = new iCalendar_property_x;
$property->set_name($name);
}
else {
$classname = 'iCalendar_property_'.strtolower(str_replace('-', '_', $name));
$property = new $classname;
}
// If $value is NULL, then this property must define a default value.
if($value === NULL) {
$value = $property->default_value();
if($value === NULL) {
return false;
}
}
// Set this property's parent component to ourselves, because some
// properties behave differently according to what component they apply to.
$property->set_parent_component($this->name);
// Set parameters before value; this helps with some properties which
// accept a VALUE parameter, and thus change their default value type.
// The parameters must be valid according to property specifications
if(!empty($parameters)) {
foreach($parameters as $paramname => $paramvalue) {
if(!$property->set_parameter($paramname, $paramvalue)) {
return false;
}
}
// Some parameters interact among themselves (e.g. ENCODING and VALUE)
// so make sure that after the dust settles, these invariants hold true
if(!$property->invariant_holds()) {
return false;
}
}
// $value MUST be valid according to the property data type
if(!$property->set_value($value)) {
return false;
}
// If this property is restricted to only once, blindly overwrite value
if(!$xname && $this->valid_properties[$name] & RFC2445_ONCE) {
$this->properties[$name] = array($property);
}
// Otherwise add it to the instance array for this property
else {
$this->properties[$name][] = $property;
}
// Finally: after all these, does the component invariant hold?
if(!$this->invariant_holds()) {
// If not, completely undo the property addition
array_pop($this->properties[$name]);
if(empty($this->properties[$name])) {
unset($this->properties[$name]);
}
return false;
}
return true;
}
function add_component($component) {
// With the detailed interface, you can add only components with this function
if(!is_object($component) || !is_subclass_of($component, 'iCalendar_component')) {
return false;
}
$name = $component->get_name();
// Only valid components as specified by this component are allowed
if(!in_array($name, $this->valid_components)) {
return false;
}
// Add it
$this->components[$name][] = $component;
return true;
}
function get_property_list($name) {
}
function invariant_holds() {
return true;
}
function is_valid() {
// If we have any child components, check that they are all valid
if(!empty($this->components)) {
foreach($this->components as $component => $instances) {
foreach($instances as $number => $instance) {
if(!$instance->is_valid()) {
return false;
}
}
}
}
// Finally, check the valid property list for any mandatory properties
// that have not been set and do not have a default value
foreach($this->valid_properties as $property => $propdata) {
if(($propdata & RFC2445_REQUIRED) && empty($this->properties[$property])) {
$classname = 'iCalendar_property_'.strtolower(str_replace('-', '_', $property));
$object = new $classname;
if($object->default_value() === NULL) {
return false;
}
unset($object);
}
}
return true;
}
function serialize() {
// Check for validity of the object
if(!$this->is_valid()) {
return false;
}
// Maybe the object is valid, but there are some required properties that
// have not been given explicit values. In that case, set them to defaults.
foreach($this->valid_properties as $property => $propdata) {
if(($propdata & RFC2445_REQUIRED) && empty($this->properties[$property])) {
$this->add_property($property);
}
}
// Start tag
$string = rfc2445_fold('BEGIN:'.$this->name) . RFC2445_CRLF;
// List of properties
if(!empty($this->properties)) {
foreach($this->properties as $name => $properties) {
foreach($properties as $property) {
$string .= $property->serialize();
}
}
}
// List of components
if(!empty($this->components)) {
foreach($this->components as $name => $components) {
foreach($components as $component) {
$string .= $component->serialize();
}
}
}
// End tag
$string .= rfc2445_fold('END:'.$this->name) . RFC2445_CRLF;
return $string;
}
}
class iCalendar extends iCalendar_component {
var $name = 'VCALENDAR';
function construct() {
$this->valid_properties = array(
'CALSCALE' => RFC2445_OPTIONAL | RFC2445_ONCE,
'METHOD' => RFC2445_OPTIONAL | RFC2445_ONCE,
'PRODID' => RFC2445_REQUIRED | RFC2445_ONCE,
'VERSION' => RFC2445_REQUIRED | RFC2445_ONCE,
RFC2445_XNAME => RFC2445_OPTIONAL
);
$this->valid_components = array(
'VEVENT'
// TODO: add support for the other component types
//, 'VTODO', 'VJOURNAL', 'VFREEBUSY', 'VTIMEZONE', 'VALARM'
);
parent::construct();
}
}
class iCalendar_event extends iCalendar_component {
var $name = 'VEVENT';
var $properties;
function construct() {
$this->valid_components = array('VALARM');
$this->valid_properties = array(
'CLASS' => RFC2445_OPTIONAL | RFC2445_ONCE,
'CREATED' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DESCRIPTION' => RFC2445_OPTIONAL | RFC2445_ONCE,
// Standard ambiguous here: in 4.6.1 it says that DTSTAMP in optional,
// while in 4.8.7.2 it says it's REQUIRED. Go with REQUIRED.
'DTSTAMP' => RFC2445_REQUIRED | RFC2445_ONCE,
// Standard ambiguous here: in 4.6.1 it says that DTSTART in optional,
// while in 4.8.2.4 it says it's REQUIRED. Go with REQUIRED.
'DTSTART' => RFC2445_REQUIRED | RFC2445_ONCE,
'GEO' => RFC2445_OPTIONAL | RFC2445_ONCE,
'LAST-MODIFIED' => RFC2445_OPTIONAL | RFC2445_ONCE,
'LOCATION' => RFC2445_OPTIONAL | RFC2445_ONCE,
'ORGANIZER' => RFC2445_OPTIONAL | RFC2445_ONCE,
'PRIORITY' => RFC2445_OPTIONAL | RFC2445_ONCE,
'SEQUENCE' => RFC2445_OPTIONAL | RFC2445_ONCE,
'STATUS' => RFC2445_OPTIONAL | RFC2445_ONCE,
'SUMMARY' => RFC2445_OPTIONAL | RFC2445_ONCE,
'TRANSP' => RFC2445_OPTIONAL | RFC2445_ONCE,
// Standard ambiguous here: in 4.6.1 it says that UID in optional,
// while in 4.8.4.7 it says it's REQUIRED. Go with REQUIRED.
'UID' => RFC2445_REQUIRED | RFC2445_ONCE,
'URL' => RFC2445_OPTIONAL | RFC2445_ONCE,
'RECURRENCE-ID' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DTEND' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DURATION' => RFC2445_OPTIONAL | RFC2445_ONCE,
'ATTACH' => RFC2445_OPTIONAL,
'ATTENDEE' => RFC2445_OPTIONAL,
'CATEGORIES' => RFC2445_OPTIONAL,
'COMMENT' => RFC2445_OPTIONAL,
'CONTACT' => RFC2445_OPTIONAL,
'EXDATE' => RFC2445_OPTIONAL,
'EXRULE' => RFC2445_OPTIONAL,
'REQUEST-STATUS' => RFC2445_OPTIONAL,
'RELATED-TO' => RFC2445_OPTIONAL,
'RESOURCES' => RFC2445_OPTIONAL,
'RDATE' => RFC2445_OPTIONAL,
'RRULE' => RFC2445_OPTIONAL,
RFC2445_XNAME => RFC2445_OPTIONAL
);
parent::construct();
}
function invariant_holds() {
// DTEND and DURATION must not appear together
if(isset($this->properties['DTEND']) && isset($this->properties['DURATION'])) {
return false;
}
if(isset($this->properties['DTEND']) && isset($this->properties['DTSTART'])) {
// DTEND must be later than DTSTART
// The standard is not clear on how to hande different value types though
// TODO: handle this correctly even if the value types are different
if($this->properties['DTEND'][0]->value <= $this->properties['DTSTART'][0]->value) {
return false;
}
// DTEND and DTSTART must have the same value type
if($this->properties['DTEND'][0]->val_type != $this->properties['DTSTART'][0]->val_type) {
return false;
}
}
return true;
}
}
class iCalendar_todo extends iCalendar_component {
var $name = 'VTODO';
var $properties;
function construct() {
$this->properties = array(
'class' => RFC2445_OPTIONAL | RFC2445_ONCE,
'completed' => RFC2445_OPTIONAL | RFC2445_ONCE,
'created' => RFC2445_OPTIONAL | RFC2445_ONCE,
'description' => RFC2445_OPTIONAL | RFC2445_ONCE,
'dtstamp' => RFC2445_OPTIONAL | RFC2445_ONCE,
'dtstart' => RFC2445_OPTIONAL | RFC2445_ONCE,
'geo' => RFC2445_OPTIONAL | RFC2445_ONCE,
'last-modified' => RFC2445_OPTIONAL | RFC2445_ONCE,
'location' => RFC2445_OPTIONAL | RFC2445_ONCE,
'organizer' => RFC2445_OPTIONAL | RFC2445_ONCE,
'percent' => RFC2445_OPTIONAL | RFC2445_ONCE,
'priority' => RFC2445_OPTIONAL | RFC2445_ONCE,
'recurid' => RFC2445_OPTIONAL | RFC2445_ONCE,
'sequence' => RFC2445_OPTIONAL | RFC2445_ONCE,
'status' => RFC2445_OPTIONAL | RFC2445_ONCE,
'summary' => RFC2445_OPTIONAL | RFC2445_ONCE,
'uid' => RFC2445_OPTIONAL | RFC2445_ONCE,
'url' => RFC2445_OPTIONAL | RFC2445_ONCE,
'due' => RFC2445_OPTIONAL | RFC2445_ONCE,
'duration' => RFC2445_OPTIONAL | RFC2445_ONCE,
'attach' => RFC2445_OPTIONAL,
'attendee' => RFC2445_OPTIONAL,
'categories' => RFC2445_OPTIONAL,
'comment' => RFC2445_OPTIONAL,
'contact' => RFC2445_OPTIONAL,
'exdate' => RFC2445_OPTIONAL,
'exrule' => RFC2445_OPTIONAL,
'rstatus' => RFC2445_OPTIONAL,
'related' => RFC2445_OPTIONAL,
'resources' => RFC2445_OPTIONAL,
'rdate' => RFC2445_OPTIONAL,
'rrule' => RFC2445_OPTIONAL,
'xprop' => RFC2445_OPTIONAL
);
parent::construct();
// TODO:
// either 'due' or 'duration' may appear in a 'eventprop', but 'due'
// and 'duration' MUST NOT occur in the same 'eventprop'
}
}
class iCalendar_journal extends iCalendar_component {
// TODO: implement
}
class iCalendar_freebusy extends iCalendar_component {
// TODO: implement
}
class iCalendar_alarm extends iCalendar_component {
// TODO: implement
}
class iCalendar_timezone extends iCalendar_component {
var $name = 'VTIMEZONE';
var $properties;
function construct() {
$this->properties = array(
'tzid' => RFC2445_REQUIRED | RFC2445_ONCE,
'last-modified' => RFC2445_OPTIONAL | RFC2445_ONCE,
'tzurl' => RFC2445_OPTIONAL | RFC2445_ONCE,
// TODO: the next two are components of their own!
'standardc' => RFC2445_REQUIRED,
'daylightc' => RFC2445_REQUIRED,
'x-prop' => RFC2445_OPTIONAL
);
parent::construct();
}
}
// REMINDER: DTEND must be later than DTSTART for all components which support both
// REMINDER: DUE must be later than DTSTART for all components which support both
?>

240
lib/bennu/iCalendar_parameters.php Normal file

@ -0,0 +1,240 @@
<?php // $Id$
/**
* BENNU - PHP iCalendar library
* (c) 2005-2006 Ioannis Papaioannou (pj@moodle.org). All rights reserved.
*
* Released under the LGPL.
*
* See http://bennu.sourceforge.net/ for more information and downloads.
*
* @author Ioannis Papaioannou
* @version $Id$
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
class iCalendar_parameter {
function multiple_values_allowed($parameter) {
switch($parameter) {
case 'DELEGATED-FROM':
case 'DELEGATED-TO':
case 'MEMBER':
return true;
default:
return false;
}
}
function default_value($parameter) {
switch($parameter) {
case 'CUTYPE': return 'INDIVIDUAL';
case 'FBTYPE': return 'BUSY';
case 'PARTSTAT': return 'NEEDS-ACTION';
case 'RELATED': return 'START';
case 'RELTYPE': return 'PARENT';
case 'ROLE': return 'REQ-PARTICIPANT';
case 'RSVP': return 'FALSE';
default: return NULL;
}
}
function is_valid_value(&$parent_property, $parameter, $value) {
switch($parameter) {
// These must all be a URI
case 'ALTREP':
case 'DIR':
return rfc2445_is_valid_value($value, RFC2445_TYPE_URI);
break;
// These must be CAL-ADDRESS, which is equivalent to URI
case 'DELEGATED-FROM':
case 'DELEGATED-TO':
case 'MEMBER':
case 'SENT-BY':
return rfc2445_is_valid_value($value, RFC2445_TYPE_CAL_ADDRESS);
break;
// These are textual parameters, so the MUST NOT contain double quotes
case 'CN':
return (strpos($value, '"') === false);
break;
// These have enumerated legal values
case 'CUTYPE':
$value = strtoupper($value);
return ($value == 'INDIVIDUAL' || $value == 'GROUP' || $value == 'RESOURCE' || $value == 'ROOM' || $value == 'UNKNOWN' || rfc2445_is_xname($value));
break;
case 'ENCODING':
$value = strtoupper($value);
return ($value == '8BIT' || $value == 'BASE64' || rfc2445_is_xname($value));
break;
case 'FBTYPE':
$value = strtoupper($value);
return ($value == 'FREE' || $value == 'BUSY' || $value == 'BUSY-UNAVAILABLE' || $value == 'BUSY-TENTATIVE' || rfc2445_is_xname($value));
break;
case 'FMTTYPE':
$fmttypes = array(
'TEXT' => array('PLAIN', 'RICHTEXT', 'ENRICHED', 'TAB-SEPARATED-VALUES', 'HTML', 'SGML',
'VND.LATEX-Z', 'VND.FMI.FLEXSTOR'),
'MULTIPART' => array('MIXED', 'ALTERNATIVE', 'DIGEST', 'PARALLEL', 'APPLEDOUBLE', 'HEADER-SET',
'FORM-DATA', 'RELATED', 'REPORT', 'VOICE-MESSAGE', 'SIGNED', 'ENCRYPTED',
'BYTERANGES'),
'MESSAGE' => array('RFC822', 'PARTIAL', 'EXTERNAL-BODY', 'NEWS', 'HTTP'),
'APPLICATION' => array('OCTET-STREAM', 'POSTSCRIPT', 'ODA', 'ATOMICMAIL', 'ANDREW-INSET', 'SLATE',
'WITA', 'DEC-DX', 'DCA-RFT', 'ACTIVEMESSAGE', 'RTF', 'APPLEFILE',
'MAC-BINHEX40', 'NEWS-MESSAGE-ID', 'NEWS-TRANSMISSION', 'WORDPERFECT5.1',
'PDF', 'ZIP', 'MACWRITEII', 'MSWORD', 'REMOTE-PRINTING', 'MATHEMATICA',
'CYBERCASH', 'COMMONGROUND', 'IGES', 'RISCOS', 'ESHOP', 'X400-BP', 'SGML',
'CALS-1840', 'PGP-ENCRYPTED', 'PGP-SIGNATURE', 'PGP-KEYS', 'VND.FRAMEMAKER',
'VND.MIF', 'VND.MS-EXCEL', 'VND.MS-POWERPOINT', 'VND.MS-PROJECT',
'VND.MS-WORKS', 'VND.MS-TNEF', 'VND.SVD', 'VND.MUSIC-NIFF', 'VND.MS-ARTGALRY',
'VND.TRUEDOC', 'VND.KOAN', 'VND.STREET-STREAM', 'VND.FDF',
'SET-PAYMENT-INITIATION', 'SET-PAYMENT', 'SET-REGISTRATION-INITIATION',
'SET-REGISTRATION', 'VND.SEEMAIL', 'VND.BUSINESSOBJECTS',
'VND.MERIDIAN-SLINGSHOT', 'VND.XARA', 'SGML-OPEN-CATALOG', 'VND.RAPID',
'VND.ENLIVEN', 'VND.JAPANNET-REGISTRATION-WAKEUP',
'VND.JAPANNET-VERIFICATION-WAKEUP', 'VND.JAPANNET-PAYMENT-WAKEUP',
'VND.JAPANNET-DIRECTORY-SERVICE', 'VND.INTERTRUST.DIGIBOX', 'VND.INTERTRUST.NNCP'),
'IMAGE' => array('JPEG', 'GIF', 'IEF', 'G3FAX', 'TIFF', 'CGM', 'NAPLPS', 'VND.DWG', 'VND.SVF',
'VND.DXF', 'PNG', 'VND.FPX', 'VND.NET-FPX'),
'AUDIO' => array('BASIC', '32KADPCM', 'VND.QCELP'),
'VIDEO' => array('MPEG', 'QUICKTIME', 'VND.VIVO', 'VND.MOTOROLA.VIDEO', 'VND.MOTOROLA.VIDEOP')
);
$value = strtoupper($value);
if(rfc2445_is_xname($value)) {
return true;
}
@list($type, $subtype) = explode('/', $value);
if(empty($type) || empty($subtype)) {
return false;
}
if(!isset($fmttypes[$type]) || !in_array($subtype, $fmttypes[$type])) {
return false;
}
return true;
break;
case 'LANGUAGE':
$value = strtoupper($value);
$parts = explode('-', $value);
foreach($parts as $part) {
if(empty($part)) {
return false;
}
if(strspn($part, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789') != strlen($part)) {
return false;
}
}
return true;
break;
case 'PARTSTAT':
$value = strtoupper($value);
switch($parent_property->parent_component) {
case 'VEVENT':
return ($value == 'NEEDS-ACTION' || $value == 'ACCEPTED' || $value == 'DECLINED' || $value == 'TENTATIVE'
|| $value == 'DELEGATED' || rfc2445_is_xname($value));
break;
case 'VTODO':
return ($value == 'NEEDS-ACTION' || $value == 'ACCEPTED' || $value == 'DECLINED' || $value == 'TENTATIVE'
|| $value == 'DELEGATED' || $value == 'COMPLETED' || $value == 'IN-PROCESS' || rfc2445_is_xname($value));
break;
case 'VJOURNAL':
return ($value == 'NEEDS-ACTION' || $value == 'ACCEPTED' || $value == 'DECLINED' || rfc2445_is_xname($value));
break;
}
return false;
break;
case 'RANGE':
$value = strtoupper($value);
return ($value == 'THISANDPRIOR' || $value == 'THISANDFUTURE');
break;
case 'RELATED':
$value = strtoupper($value);
return ($value == 'START' || $value == 'END');
break;
case 'RELTYPE':
$value = strtoupper($value);
return ($value == 'PARENT' || $value == 'CHILD' || $value == 'SIBLING' || rfc2445_is_xname($value));
break;
case 'ROLE':
$value = strtoupper($value);
return ($value == 'CHAIR' || $value == 'REQ-PARTICIPANT' || $value == 'OPT-PARTICIPANT' || $value == 'NON-PARTICIPANT' || rfc2445_is_xname($value));
break;
case 'RSVP':
$value = strtoupper($value);
return ($value == 'TRUE' || $value == 'FALSE');
break;
case 'TZID':
if(empty($value)) {
return false;
}
return (strcspn($value, '";:,') == strlen($value));
break;
case 'VALUE':
$value = strtoupper($value);
return ($value == 'BINARY' || $value == 'BOOLEAN' || $value == 'CAL-ADDRESS' || $value == 'DATE' ||
$value == 'DATE-TIME' || $value == 'DURATION' || $value == 'FLOAT' || $value == 'INTEGER' ||
$value == 'PERIOD' || $value == 'RECUR' || $value == 'TEXT' || $value == 'TIME' ||
$value == 'URI' || $value == 'UTC-OFFSET' || rfc2445_is_xname($value));
break;
}
}
function do_value_formatting($parameter, $value) {
switch($parameter) {
// Parameters of type CAL-ADDRESS or URI MUST be double-quoted
case 'ALTREP':
case 'DIR':
case 'DELEGATED-FROM':
case 'DELEGATED-TO':
case 'MEMBER':
case 'SENT-BY':
return '"'.$value.'"';
break;
// Textual parameter types must be double quoted if they contain COLON, SEMICOLON
// or COMMA. Quoting always sounds easier and standards-conformant though.
case 'CN':
return '"'.$value.'"';
break;
// Parameters with enumerated legal values, just make them all caps
case 'CUTYPE':
case 'ENCODING':
case 'FBTYPE':
case 'FMTTYPE':
case 'LANGUAGE':
case 'PARTSTAT':
case 'RANGE':
case 'RELATED':
case 'RELTYPE':
case 'ROLE':
case 'RSVP':
case 'VALUE':
return strtoupper($value);
break;
// Parameters we shouldn't be messing with
case 'TZID':
return $value;
break;
}
}
function undo_value_formatting($parameter, $value) {
}
}
?>

1299
lib/bennu/iCalendar_properties.php Normal file

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785
lib/bennu/iCalendar_rfc2445.php Normal file

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<?php // $Id$
/**
* BENNU - PHP iCalendar library
* (c) 2005-2006 Ioannis Papaioannou (pj@moodle.org). All rights reserved.
*
* Released under the LGPL.
*
* See http://bennu.sourceforge.net/ for more information and downloads.
*
* @author Ioannis Papaioannou
* @version $Id$
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
/*
All names of properties, property parameters, enumerated property
values and property parameter values are case-insensitive. However,
all other property values are case-sensitive, unless otherwise
stated.
*/
define('RFC2445_CRLF', "\r\n");
define('RFC2445_WSP', "\t ");
define('RFC2445_WEEKDAYS', 'MO,TU,WE,TH,FR,SA,SU');
define('RFC2445_FOLDED_LINE_LENGTH', 75);
define('RFC2445_REQUIRED', 0x01);
define('RFC2445_OPTIONAL', 0x02);
define('RFC2445_ONCE', 0x04);
define('RFC2445_PROP_FLAGS', 0);
define('RFC2445_PROP_TYPE', 1);
define('RFC2445_PROP_DEFAULT', 2);
define('RFC2445_XNAME', 'X-');
define('RFC2445_TYPE_BINARY', 0);
define('RFC2445_TYPE_BOOLEAN', 1);
define('RFC2445_TYPE_CAL_ADDRESS', 2);
define('RFC2445_TYPE_DATE', 3);
define('RFC2445_TYPE_DATE_TIME', 4);
define('RFC2445_TYPE_DURATION', 5);
define('RFC2445_TYPE_FLOAT', 6);
define('RFC2445_TYPE_INTEGER', 7);
define('RFC2445_TYPE_PERIOD', 8);
define('RFC2445_TYPE_RECUR', 9);
define('RFC2445_TYPE_TEXT', 10);
define('RFC2445_TYPE_TIME', 11);
define('RFC2445_TYPE_URI', 12); // CAL_ADDRESS === URI
define('RFC2445_TYPE_UTC_OFFSET', 13);
function rfc2445_fold($string) {
if(strlen($string) <= RFC2445_FOLDED_LINE_LENGTH) {
return $string;
}
$retval = '';
while(strlen($string) > RFC2445_FOLDED_LINE_LENGTH) {
$retval .= substr($string, 0, RFC2445_FOLDED_LINE_LENGTH - 1) . RFC2445_CRLF . ' ';
$string = substr($string, RFC2445_FOLDED_LINE_LENGTH - 1);
}
$retval .= $string;
return $retval;
}
function rfc2445_unfold($string) {
for($i = 0; $i < strlen(RFC2445_WSP); ++$i) {
$string = str_replace(RFC2445_CRLF.substr(RFC2445_WSP, $i, 1), '', $string);
}
return $string;
}
function rfc2445_is_xname($name) {
// If it's less than 3 chars, it cannot be legal
if(strlen($name) < 3) {
return false;
}
// If it contains an illegal char anywhere, reject it
if(strspn($name, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-') != strlen($name)) {
return false;
}
// To be legal, it must still start with "X-"
return substr($name, 0, 2) === 'X-';
}
function rfc2445_is_valid_value($value, $type) {
// This branch should only be taken with xname values
if($type === NULL) {
return true;
}
switch($type) {
case RFC2445_TYPE_CAL_ADDRESS:
case RFC2445_TYPE_URI:
if(!is_string($value)) {
return false;
}
$valid_schemes = array('ftp', 'http', 'ldap', 'gopher', 'mailto', 'news', 'nntp', 'telnet', 'wais', 'file', 'prospero');
$pos = strpos($value, ':');
if(!$pos) {
return false;
}
$scheme = strtolower(substr($value, 0, $pos));
$remain = substr($value, $pos + 1);
if(!in_array($scheme, $valid_schemes)) {
return false;
}
if($scheme === 'mailto') {
$regexp = '^[a-zA-Z0-9]+[_a-zA-Z0-9\-]*(\.[_a-z0-9\-]+)*@(([0-9a-zA-Z\-]+\.)+[a-zA-Z][0-9a-zA-Z\-]+|([0-9]{1,3}\.){3}[0-9]{1,3})$';
}
else {
$regexp = '^//(.+(:.*)?@)?(([0-9a-zA-Z\-]+\.)+[a-zA-Z][0-9a-zA-Z\-]+|([0-9]{1,3}\.){3}[0-9]{1,3})(:[0-9]{1,5})?(/.*)?$';
}
return ereg($regexp, $remain);
break;
case RFC2445_TYPE_BINARY:
if(!is_string($value)) {
return false;
}
$len = strlen($value);
if($len % 4 != 0) {
return false;
}
for($i = 0; $i < $len; ++$i) {
$ch = $value{$i};
if(!($ch >= 'a' && $ch <= 'z' || $ch >= 'A' && $ch <= 'Z' || $ch >= '0' && $ch <= '9' || $ch == '-' || $ch == '+')) {
if($ch == '=' && $len - $i <= 2) {
continue;
}
return false;
}
}
return true;
break;
case RFC2445_TYPE_BOOLEAN:
if(is_bool($value)) {
return true;
}
if(is_string($value)) {
$value = strtoupper($value);
return ($value == 'TRUE' || $value == 'FALSE');
}
return false;
break;
case RFC2445_TYPE_DATE:
if(is_int($value)) {
if($value < 0) {
return false;
}
$value = "$value";
}
else if(!is_string($value)) {
return false;
}
if(strlen($value) != 8) {
return false;
}
$y = intval(substr($value, 0, 4));
$m = intval(substr($value, 4, 2));
$d = intval(substr($value, 6, 2));
return checkdate($m, $d, $y);
break;
case RFC2445_TYPE_DATE_TIME:
if(!is_string($value) || strlen($value) < 15) {
return false;
}
return($value{8} == 'T' &&
rfc2445_is_valid_value(substr($value, 0, 8), RFC2445_TYPE_DATE) &&
rfc2445_is_valid_value(substr($value, 9), RFC2445_TYPE_TIME));
break;
case RFC2445_TYPE_DURATION:
if(!is_string($value)) {
return false;
}
$len = strlen($value);
if($len < 3) {
// Minimum conformant length: "P1W"
return false;
}
if($value{0} == '+' || $value{0} == '-') {
$value = substr($value, 1);
--$len; // Don't forget to update this!
}
if($value{0} != 'P') {
return false;
}
// OK, now break it up
$num = '';
$allowed = 'WDT';
for($i = 1; $i < $len; ++$i) {
$ch = $value{$i};
if($ch >= '0' && $ch <= '9') {
$num .= $ch;
continue;
}
if(strpos($allowed, $ch) === false) {
// Non-numeric character which shouldn't be here
return false;
}
if($num === '' && $ch != 'T') {
// Allowed non-numeric character, but no digits came before it
return false;
}
// OK, $ch now holds a character which tells us what $num is
switch($ch) {
case 'W':
// If duration in weeks is specified, this must end the string
return ($i == $len - 1);
break;
case 'D':
// Days specified, now if anything comes after it must be a 'T'
$allowed = 'T';
break;
case 'T':
// Starting to specify time, H M S are now valid delimiters
$allowed = 'HMS';
break;
case 'H':
$allowed = 'M';
break;
case 'M':
$allowed = 'S';
break;
case 'S':
return ($i == $len - 1);
break;
}
// If we 're going to continue, reset $num
$num = '';
}
// $num is kept for this reason: if we 're here, we ran out of chars
// therefore $num must be empty for the period to be legal
return ($num === '' && $ch != 'T');
break;
case RFC2445_TYPE_FLOAT:
if(is_float($value)) {
return true;
}
if(!is_string($value) || $value === '') {
return false;
}
$dot = false;
$int = false;
$len = strlen($value);
for($i = 0; $i < $len; ++$i) {
switch($value{$i}) {
case '-': case '+':
// A sign can only be seen at position 0 and cannot be the only char
if($i != 0 || $len == 1) {
return false;
}
break;
case '.':
// A second dot is an error
// Make sure we had at least one int before the dot
if($dot || !$int) {
return false;
}
$dot = true;
// Make also sure that the float doesn't end with a dot
if($i == $len - 1) {
return false;
}
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
$int = true;
break;
default:
// Any other char is a no-no
return false;
break;
}
}
return true;
break;
case RFC2445_TYPE_INTEGER:
if(is_int($value)) {
return true;
}
if(!is_string($value) || $value === '') {
return false;
}
if($value{0} == '+' || $value{0} == '-') {
if(strlen($value) == 1) {
return false;
}
$value = substr($value, 1);
}
if(strspn($value, '0123456789') != strlen($value)) {
return false;
}
return ($value >= -2147483648 && $value <= 2147483647);
break;
case RFC2445_TYPE_PERIOD:
if(!is_string($value) || empty($value)) {
return false;
}
$parts = explode('/', $value);
if(count($parts) != 2) {
return false;
}
if(!rfc2445_is_valid_value($parts[0], RFC2445_TYPE_DATE_TIME)) {
return false;
}
// Two legal cases for the second part:
if(rfc2445_is_valid_value($parts[1], RFC2445_TYPE_DATE_TIME)) {
// It has to be after the start time, so
return ($parts[1] > $parts[0]);
}
else if(rfc2445_is_valid_value($parts[1], RFC2445_TYPE_DURATION)) {
// The period MUST NOT be negative
return ($parts[1]{0} != '-');
}
// It seems to be illegal
return false;
break;
case RFC2445_TYPE_RECUR:
if(!is_string($value)) {
return false;
}
$parts = explode(';', strtoupper($value));
// First of all, we need at least a FREQ and a UNTIL or COUNT part, so...
if(count($parts) < 2) {
return false;
}
// Let's get that into a more easily comprehensible format
$vars = array();
foreach($parts as $part) {
$pieces = explode('=', $part);
// There must be exactly 2 pieces, e.g. FREQ=WEEKLY
if(count($pieces) != 2) {
return false;
}
// It's illegal for a variable to appear twice
if(isset($vars[$pieces[0]])) {
return false;
}
// Sounds good
$vars[$pieces[0]] = $pieces[1];
}
// OK... now to test everything else
// FREQ must be the first thing appearing
reset($vars);
if(key($vars) != 'FREQ') {
return false;
}
// It's illegal to have both UNTIL and COUNT appear
if(isset($vars['UNTIL']) && isset($vars['COUNT'])) {
return false;
}
// Special case: BYWEEKNO is only valid for FREQ=YEARLY
if(isset($vars['BYWEEKNO']) && $vars['FREQ'] != 'YEARLY') {
return false;
}
// Special case: BYSETPOS is only valid if another BY option is specified
if(isset($vars['BYSETPOS'])) {
$options = array('BYSECOND', 'BYMINUTE', 'BYHOUR', 'BYDAY', 'BYMONTHDAY', 'BYYEARDAY', 'BYWEEKNO', 'BYMONTH');
$defined = array_keys($vars);
$common = array_intersect($options, $defined);
if(empty($common)) {
return false;
}
}
// OK, now simply check if each element has a valid value,
// unsetting them on the way. If at the end the array still
// has some elements, they are illegal.
if($vars['FREQ'] != 'SECONDLY' && $vars['FREQ'] != 'MINUTELY' && $vars['FREQ'] != 'HOURLY' &&
$vars['FREQ'] != 'DAILY' && $vars['FREQ'] != 'WEEKLY' &&
$vars['FREQ'] != 'MONTHLY' && $vars['FREQ'] != 'YEARLY') {
return false;
}
unset($vars['FREQ']);
// Set this, we may need it later
$weekdays = explode(',', RFC2445_WEEKDAYS);
if(isset($vars['UNTIL'])) {
if(rfc2445_is_valid_value($vars['UNTIL'], RFC2445_TYPE_DATE_TIME)) {
// The time MUST be in UTC format
if(!(substr($vars['UNTIL'], -1) == 'Z')) {
return false;
}
}
else if(!rfc2445_is_valid_value($vars['UNTIL'], RFC2445_TYPE_DATE_TIME)) {
return false;
}
}
unset($vars['UNTIL']);
if(isset($vars['COUNT'])) {
if(empty($vars['COUNT'])) {
// This also catches the string '0', which makes no sense
return false;
}
if(strspn($vars['COUNT'], '0123456789') != strlen($vars['COUNT'])) {
return false;
}
}
unset($vars['COUNT']);
if(isset($vars['INTERVAL'])) {
if(empty($vars['INTERVAL'])) {
// This also catches the string '0', which makes no sense
return false;
}
if(strspn($vars['INTERVAL'], '0123456789') != strlen($vars['INTERVAL'])) {
return false;
}
}
unset($vars['INTERVAL']);
if(isset($vars['BYSECOND'])) {
if($vars['BYSECOND'] == '') {
return false;
}
// Comma also allowed
if(strspn($vars['BYSECOND'], '0123456789,') != strlen($vars['BYSECOND'])) {
return false;
}
$secs = explode(',', $vars['BYSECOND']);
foreach($secs as $sec) {
if($sec == '' || $sec < 0 || $sec > 59) {
return false;
}
}
}
unset($vars['BYSECOND']);
if(isset($vars['BYMINUTE'])) {
if($vars['BYMINUTE'] == '') {
return false;
}
// Comma also allowed
if(strspn($vars['BYMINUTE'], '0123456789,') != strlen($vars['BYMINUTE'])) {
return false;
}
$mins = explode(',', $vars['BYMINUTE']);
foreach($mins as $min) {
if($min == '' || $min < 0 || $min > 59) {
return false;
}
}
}
unset($vars['BYMINUTE']);
if(isset($vars['BYHOUR'])) {
if($vars['BYHOUR'] == '') {
return false;
}
// Comma also allowed
if(strspn($vars['BYHOUR'], '0123456789,') != strlen($vars['BYHOUR'])) {
return false;
}
$hours = explode(',', $vars['BYHOUR']);
foreach($hours as $hour) {
if($hour == '' || $hour < 0 || $hour > 23) {
return false;
}
}
}
unset($vars['BYHOUR']);
if(isset($vars['BYDAY'])) {
if(empty($vars['BYDAY'])) {
return false;
}
// First off, split up all values we may have
$days = explode(',', $vars['BYDAY']);
foreach($days as $day) {
$daypart = substr($day, -2);
if(!in_array($daypart, $weekdays)) {
return false;
}
if(strlen($day) > 2) {
$intpart = substr($day, 0, strlen($day) - 2);
if(!rfc2445_is_valid_value($intpart, RFC2445_TYPE_INTEGER)) {
return false;
}
if(intval($intpart) == 0) {
return false;
}
}
}
}
unset($vars['BYDAY']);
if(isset($vars['BYMONTHDAY'])) {
if(empty($vars['BYMONTHDAY'])) {
return false;
}
$mdays = explode(',', $vars['BYMONTHDAY']);
foreach($mdays as $mday) {
if(!rfc2445_is_valid_value($mday, RFC2445_TYPE_INTEGER)) {
return false;
}
$mday = abs(intval($mday));
if($mday == 0 || $mday > 31) {
return false;
}
}
}
unset($vars['BYMONTHDAY']);
if(isset($vars['BYYEARDAY'])) {
if(empty($vars['BYYEARDAY'])) {
return false;
}
$ydays = explode(',', $vars['BYYEARDAY']);
foreach($ydays as $yday) {
if(!rfc2445_is_valid_value($yday, RFC2445_TYPE_INTEGER)) {
return false;
}
$yday = abs(intval($yday));
if($yday == 0 || $yday > 366) {
return false;
}
}
}
unset($vars['BYYEARDAY']);
if(isset($vars['BYWEEKNO'])) {
if(empty($vars['BYWEEKNO'])) {
return false;
}
$weeknos = explode(',', $vars['BYWEEKNO']);
foreach($weeknos as $weekno) {
if(!rfc2445_is_valid_value($weekno, RFC2445_TYPE_INTEGER)) {
return false;
}
$weekno = abs(intval($weekno));
if($weekno == 0 || $weekno > 53) {
return false;
}
}
}
unset($vars['BYWEEKNO']);
if(isset($vars['BYMONTH'])) {
if(empty($vars['BYMONTH'])) {
return false;
}
// Comma also allowed
if(strspn($vars['BYMONTH'], '0123456789,') != strlen($vars['BYMONTH'])) {
return false;
}
$months = explode(',', $vars['BYMONTH']);
foreach($months as $month) {
if($month == '' || $month < 1 || $month > 12) {
return false;
}
}
}
unset($vars['BYMONTH']);
if(isset($vars['BYSETPOS'])) {
if(empty($vars['BYSETPOS'])) {
return false;
}
$sets = explode(',', $vars['BYSETPOS']);
foreach($sets as $set) {
if(!rfc2445_is_valid_value($set, RFC2445_TYPE_INTEGER)) {
return false;
}
$set = abs(intval($set));
if($set == 0 || $set > 366) {
return false;
}
}
}
unset($vars['BYSETPOS']);
if(isset($vars['WKST'])) {
if(!in_array($vars['WKST'], $weekdays)) {
return false;
}
}
unset($vars['WKST']);
// Any remaining vars must be x-names
if(empty($vars)) {
return true;
}
foreach($vars as $name => $var) {
if(!rfc2445_is_xname($name)) {
return false;
}
}
// At last, all is OK!
return true;
break;
case RFC2445_TYPE_TEXT:
return true;
break;
case RFC2445_TYPE_TIME:
if(is_int($value)) {
if($value < 0) {
return false;
}
$value = "$value";
}
else if(!is_string($value)) {
return false;
}
if(strlen($value) == 7) {
if(strtoupper(substr($value, -1)) != 'Z') {
return false;
}
$value = substr($value, 0, 6);
}
if(strlen($value) != 6) {
return false;
}
$h = intval(substr($value, 0, 2));
$m = intval(substr($value, 2, 2));
$s = intval(substr($value, 4, 2));
return ($h <= 23 && $m <= 59 && $s <= 60);
break;
case RFC2445_TYPE_UTC_OFFSET:
if(is_int($value)) {
if($value >= 0) {
$value = "+$value";
}
else {
$value = "$value";
}
}
else if(!is_string($value)) {
return false;
}
if(strlen($value) == 7) {
$s = intval(substr($value, 5, 2));
$value = substr($value, 0, 5);
}
if(strlen($value) != 5 || $value == "-0000") {
return false;
}
if($value{0} != '+' && $value{0} != '-') {
return false;
}
$h = intval(substr($value, 1, 2));
$m = intval(substr($value, 3, 2));
return ($h <= 23 && $m <= 59 && $s <= 59);
break;
}
// TODO: remove this assertion
trigger_error('bad code path', E_USER_WARNING);
var_dump($type);
return false;
}
function rfc2445_do_value_formatting($value, $type) {
// Note: this does not only do formatting; it also does conversion to string!
switch($type) {
case RFC2445_TYPE_CAL_ADDRESS:
case RFC2445_TYPE_URI:
// Enclose in double quotes
$value = '"'.$value.'"';
break;
case RFC2445_TYPE_TEXT:
// Escape entities
$value = strtr($value, array("\n" => '\\n', '\\' => '\\\\', ',' => '\\,', ';' => '\\;'));
break;
}
return $value;
}
function rfc2445_undo_value_formatting($value, $type) {
switch($type) {
case RFC2445_TYPE_CAL_ADDRESS:
case RFC2445_TYPE_URI:
// Trim beginning and end double quote
$value = substr($value, 1, strlen($value) - 2);
break;
case RFC2445_TYPE_TEXT:
// Unescape entities
$value = strtr($value, array('\\n' => "\n", '\\N' => "\n", '\\\\' => '\\', '\\,' => ',', '\\;' => ';'));
break;
}
return $value;
}
?>