function is_valid_value($value)
{
// This MUST be two floats separated by a semicolon
if (!is_string($value)) {
return false;
}
$floats = explode(';', $value);
if (count($floats) != 2) {
return false;
}
return rfc2445_is_valid_value($floats[0], RFC2445_TYPE_FLOAT) && rfc2445_is_valid_value($floats[1], RFC2445_TYPE_FLOAT);
}
function is_valid_value($value)
{
if (!parent::is_valid_value($value)) {
return false;
}
// Must either be DURATION or DATE_TIME type
return rfc2445_is_valid_value($value, RFC2445_TYPE_DURATION) || rfc2445_is_valid_value($value, RFC2445_TYPE_DATE_TIME);
}
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 is_valid_value(&$parent_property, $parameter, $value)
{
switch ($parameter) {
// These must all be a URI
case 'ALTREP':
case 'DIR':
return rfc2445_is_valid_value($value, RFC2445_TYPE_URI);
break;
// These must be CAL-ADDRESS, which is equivalent to URI
// These must be CAL-ADDRESS, which is equivalent to URI
case 'DELEGATED-FROM':
case 'DELEGATED-TO':
case 'MEMBER':
case 'SENT-BY':
return rfc2445_is_valid_value($value, RFC2445_TYPE_CAL_ADDRESS);
break;
// These are textual parameters, so the MUST NOT contain double quotes
// These are textual parameters, so the MUST NOT contain double quotes
case 'CN':
return strpos($value, '"') === false;
break;
// These have enumerated legal values
// 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;
}
}
