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<?php
/**
* 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
* @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;
/**
* Added to hold errors from last run of unserialize
* @var $parser_errors array
*/
var $parser_errors = NULL;
function __construct() {
// Initialize the components array
if(empty($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($value)) {
return false;
}
// Check if the property already exists, and is limited to one occurrance,
// DON'T overwrite the value - this can be done explicity with set_value() instead.
if(!$xname && $this->valid_properties[$name] & RFC2445_ONCE && isset($this->properties[$name])) {
return false;
}
else {
// Otherwise add it to the instance array for this property
$this->properties[$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;
}
/**
* unserialize()
*
* I needed a way to convert an iCalendar component back to a Bennu object so I could
* easily access and modify it after it had been stored; if this functionality is already
* present somewhere in the library, I apologize for adding it here unnecessarily; however,
* I couldn't find it so I added it myself.
* @param string $string the iCalendar object to load in to this iCalendar_component
* @return bool true if the file parsed with no errors. False if there were errors.
*/
function unserialize($string) {
$string = rfc2445_unfold($string); // Unfold any long lines
$lines = preg_split("<".RFC2445_CRLF."|\n|\r>", $string, 0, PREG_SPLIT_NO_EMPTY); // Create an array of lines.
$components = array(); // Initialise a stack of components
$this->clear_errors();
foreach ($lines as $key => $line) {
// ignore empty lines
if (trim($line) == '') {
continue;
}
// Divide the line up into label, parameters and data fields.
if (!preg_match('#^(?P<label>[-[:alnum:]]+)(?P<params>(?:;(?:(?:[-[:alnum:]]+)=(?:[^[:cntrl:]";:,]+|"[^[:cntrl:]"]+")))*):(?P<data>.*)$#', $line, $match)) {
$this->parser_error('Invalid line: '.$key.', ignoring');
continue;
}
// parse parameters
$params = array();
if (preg_match_all('#;(?P<param>[-[:alnum:]]+)=(?P<value>[^[:cntrl:]";:,]+|"[^[:cntrl:]"]+")#', $match['params'], $pmatch)) {
$params = array_combine($pmatch['param'], $pmatch['value']);
}
$label = $match['label'];
$data = $match['data'];
unset($match, $pmatch);
if ($label == 'BEGIN') {
// This is the start of a component.
$current_component = array_pop($components); // Get the current component off the stack so we can check its valid components
if ($current_component == null) { // If there's nothing on the stack
$current_component = $this; // use the iCalendar
}
if (in_array($data, $current_component->valid_components)) { // Check that the new component is a valid subcomponent of the current one
if($current_component != $this) {
array_push($components, $current_component); // We're done with the current component, put it back on the stack.
}
if(strpos($data, 'V') === 0) {
$data = substr($data, 1);
}
$cname = 'iCalendar_' . strtolower($data);
$new_component = new $cname;
array_push($components, $new_component); // Push a new component onto the stack
} else {
if($current_component != $this) {
array_push($components, $current_component);
$this->parser_error('Invalid component type on line '.$key);
}
}
unset($current_component, $new_component);
} else if ($label == 'END') {
// It's the END of a component.
$component = array_pop($components); // Pop the top component off the stack - we're now done with it
$parent_component = array_pop($components); // Pop the component's conatining component off the stack so we can add this component to it.
if($parent_component == null) {
$parent_component = $this; // If there's no components on the stack, use the iCalendar object
}
if ($component !== null) {
if ($parent_component->add_component($component) === false) {
$this->parser_error("Failed to add component on line $key");
}
}
if ($parent_component != $this) { // If we're not using the iCalendar
array_push($components, $parent_component); // Put the component back on the stack
}
unset($parent_component, $component);
} else {
$component = array_pop($components); // Get the component off the stack so we can add properties to it
if ($component == null) { // If there's nothing on the stack
$component = $this; // use the iCalendar
}
$cleanedparams = [];
// Some parameter values are wrapped by DQUOTE character.
// We need to go through and get the actual value inside the quoted string.
foreach ($params as $param => $value) {
if (preg_match('#"(?P<actualvalue>[^"]*?)"#', $value, $matches)) {
$cleanedparams[$param] = $matches['actualvalue'];
} else {
$cleanedparams[$param] = $value;
}
}
$params = $cleanedparams;
if ($component->add_property($label, $data, $params) === false) {
$this->parser_error("Failed to add property '$label' on line $key");
}
if($component != $this) { // If we're not using the iCalendar
array_push($components, $component); // Put the component back on the stack
}
unset($component);
}
}
}
function clear_errors() {
$this->parser_errors = array();
}
function parser_error($error) {
$this->parser_errors[] = $error;
}
}
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', '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->valid_components = array('VALARM');
$this->valid_properties = array(
'CLASS' => RFC2445_OPTIONAL | RFC2445_ONCE,
'COMPLETED' => RFC2445_OPTIONAL | RFC2445_ONCE,
'CREATED' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DESCRIPTION' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DTSTAMP' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DTSTAP' => RFC2445_OPTIONAL | RFC2445_ONCE,
'GEO' => RFC2445_OPTIONAL | RFC2445_ONCE,
'LAST-MODIFIED' => RFC2445_OPTIONAL | RFC2445_ONCE,
'LOCATION' => RFC2445_OPTIONAL | RFC2445_ONCE,
'ORGANIZER' => RFC2445_OPTIONAL | RFC2445_ONCE,
'PERCENT' => RFC2445_OPTIONAL | RFC2445_ONCE,
'PRIORITY' => RFC2445_OPTIONAL | RFC2445_ONCE,
'RECURID' => RFC2445_OPTIONAL | RFC2445_ONCE,
'SEQUENCE' => RFC2445_OPTIONAL | RFC2445_ONCE,
'STATUS' => RFC2445_OPTIONAL | RFC2445_ONCE,
'SUMMARY' => RFC2445_OPTIONAL | RFC2445_ONCE,
'UID' => RFC2445_OPTIONAL | RFC2445_ONCE,
'URL' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DUE' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DURATION' => RFC2445_OPTIONAL | RFC2445_ONCE,
'ATTACH' => RFC2445_OPTIONAL,
'ATTENDEE' => RFC2445_OPTIONAL,
'CATEGORIES' => RFC2445_OPTIONAL,
'COMMENT' => RFC2445_OPTIONAL,
'CONTACT' => RFC2445_OPTIONAL,
'EXDATE' => RFC2445_OPTIONAL,
'EXRULE' => RFC2445_OPTIONAL,
'RSTATUS' => RFC2445_OPTIONAL,
'RELATED' => RFC2445_OPTIONAL,
'RESOURCES' => RFC2445_OPTIONAL,
'RDATE' => RFC2445_OPTIONAL,
'RRULE' => RFC2445_OPTIONAL,
RFC2445_XNAME => RFC2445_OPTIONAL
);
parent::__construct();
}
function invariant_holds() {
// DTEND and DURATION must not appear together
if(isset($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 != $this->properties['DTSTART'][0]->val_type) {
return false;
}
}
if(isset($this->properties['DUE']) && isset($this->properties['DTSTART'])) {
if($this->properties['DUE'][0]->value <= $this->properties['DTSTART'][0]->value) {
return false;
}
}
return true;
}
}
class iCalendar_journal extends iCalendar_component {
var $name = 'VJOURNAL';
var $properties;
function __construct() {
$this->valid_properties = array(
'CLASS' => RFC2445_OPTIONAL | RFC2445_ONCE,
'CREATED' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DESCRIPTION' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DTSTART' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DTSTAMP' => RFC2445_OPTIONAL | RFC2445_ONCE,
'LAST-MODIFIED' => RFC2445_OPTIONAL | RFC2445_ONCE,
'ORGANIZER' => RFC2445_OPTIONAL | RFC2445_ONCE,
'RECURRANCE-ID' => 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,
'ATTACH' => RFC2445_OPTIONAL,
'ATTENDEE' => RFC2445_OPTIONAL,
'CATEGORIES' => RFC2445_OPTIONAL,
'COMMENT' => RFC2445_OPTIONAL,
'CONTACT' => RFC2445_OPTIONAL,
'EXDATE' => RFC2445_OPTIONAL,
'EXRULE' => RFC2445_OPTIONAL,
'RELATED-TO' => RFC2445_OPTIONAL,
'RDATE' => RFC2445_OPTIONAL,
'RRULE' => RFC2445_OPTIONAL,
RFC2445_XNAME => RFC2445_OPTIONAL
);
parent::__construct();
}
}
class iCalendar_freebusy extends iCalendar_component {
var $name = 'VFREEBUSY';
var $properties;
function __construct() {
$this->valid_components = array();
$this->valid_properties = array(
'CONTACT' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DTSTART' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DTEND' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DURATION' => RFC2445_OPTIONAL | RFC2445_ONCE,
'DTSTAMP' => RFC2445_OPTIONAL | RFC2445_ONCE,
'ORGANIZER' => RFC2445_OPTIONAL | RFC2445_ONCE,
'UID' => RFC2445_OPTIONAL | RFC2445_ONCE,
'URL' => RFC2445_OPTIONAL | RFC2445_ONCE,
// TODO: the next two are components of their own!
'ATTENDEE' => RFC2445_OPTIONAL,
'COMMENT' => RFC2445_OPTIONAL,
'FREEBUSY' => RFC2445_OPTIONAL,
'RSTATUS' => RFC2445_OPTIONAL,
RFC2445_XNAME => RFC2445_OPTIONAL
);
parent::__construct();
}
function invariant_holds() {
// DTEND and DURATION must not appear together
if(isset($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_alarm extends iCalendar_component {
var $name = 'VALARM';
var $properties;
function __construct() {
$this->valid_components = array();
$this->valid_properties = array(
'ACTION' => RFC2445_REQUIRED | RFC2445_ONCE,
'TRIGGER' => RFC2445_REQUIRED | RFC2445_ONCE,
// If one of these 2 occurs, so must the other.
'DURATION' => RFC2445_OPTIONAL | RFC2445_ONCE,
'REPEAT' => RFC2445_OPTIONAL | RFC2445_ONCE,
// The following is required if action == "PROCEDURE" | "AUDIO"
'ATTACH' => RFC2445_OPTIONAL,
// The following is required if trigger == "EMAIL" | "DISPLAY"
'DESCRIPTION' => RFC2445_OPTIONAL | RFC2445_ONCE,
// The following are required if action == "EMAIL"
'SUMMARY' => RFC2445_OPTIONAL | RFC2445_ONCE,
'ATTENDEE' => RFC2445_OPTIONAL,
RFC2445_XNAME => RFC2445_OPTIONAL
);
parent::__construct();
}
function invariant_holds() {
// DTEND and DURATION must not appear together
if(isset($this->properties['ACTION'])) {
switch ($this->properties['ACTION'][0]->value) {
case 'AUDIO':
if (!isset($this->properties['ATTACH'])) {
return false;
}
break;
case 'DISPLAY':
if (!isset($this->properties['DESCRIPTION'])) {
return false;
}
break;
case 'EMAIL':
if (!isset($this->properties['DESCRIPTION']) || !isset($this->properties['SUMMARY']) || !isset($this->properties['ATTACH'])) {
return false;
}
break;
case 'PROCEDURE':
if (!isset($this->properties['ATTACH']) || count($this->properties['ATTACH']) > 1) {
return false;
}
break;
}
}
return true;
}
}
class iCalendar_timezone extends iCalendar_component {
var $name = 'VTIMEZONE';
var $properties;
function __construct() {
$this->valid_components = array('STANDARD', 'DAYLIGHT');
$this->valid_properties = array(
'TZID' => RFC2445_REQUIRED | RFC2445_ONCE,
'LAST-MODIFIED' => RFC2445_OPTIONAL | RFC2445_ONCE,
'TZURL' => RFC2445_OPTIONAL | RFC2445_ONCE,
RFC2445_XNAME => RFC2445_OPTIONAL
);
parent::__construct();
}
}
class iCalendar_standard extends iCalendar_component {
var $name = 'STANDARD';
var $properties;
function __construct() {
$this->valid_components = array();
$this->valid_properties = array(
'DTSTART' => RFC2445_REQUIRED | RFC2445_ONCE,
'TZOFFSETTO' => RFC2445_REQUIRED | RFC2445_ONCE,
'TZOFFSETFROM' => RFC2445_REQUIRED | RFC2445_ONCE,
'COMMENT' => RFC2445_OPTIONAL,
'RDATE' => RFC2445_OPTIONAL,
'RRULE' => RFC2445_OPTIONAL,
'TZNAME' => RFC2445_OPTIONAL,
'TZURL' => RFC2445_OPTIONAL,
RFC2445_XNAME => RFC2445_OPTIONAL,
);
parent::__construct();
}
}
class iCalendar_daylight extends iCalendar_standard {
var $name = 'DAYLIGHT';
}
// 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