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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
*/
/*
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_PARAMETER_SEPARATOR', ';');
define('RFC2445_VALUE_SEPARATOR', ':');
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($string) {
if(core_text::strlen($string, 'utf-8') <= RFC2445_FOLDED_LINE_LENGTH) {
return $string;
}
$retval = '';
$i=0;
$len_count=0;
//multi-byte string, get the correct length
$section_len = core_text::strlen($string, 'utf-8');
while($len_count<$section_len) {
//get the current portion of the line
$section = core_text::substr($string, ($i * RFC2445_FOLDED_LINE_LENGTH), (RFC2445_FOLDED_LINE_LENGTH), 'utf-8');
//increment the length we've processed by the length of the new portion
$len_count += core_text::strlen($section, 'utf-8');
/* Add the portion to the return value, terminating with CRLF.HTAB
As per RFC 2445, CRLF.HTAB will be replaced by the processor of the
data */
$retval .= $section . RFC2445_CRLF . substr(RFC2445_WSP, 0, 1);
$i++;
}
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 preg_match($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));
// We need at least one part for a valid rule, for example: "FREQ=DAILY".
if(empty($parts)) {
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;
}
$s = 0;
if(strlen($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("\r\n" => '\\n', "\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;
}