<?php

/**
 * MDBO Framework Version 3 - Standalone Validation Functions
 *
 * Names should be self-explanatory; comments will explain more complicated cases.
 *
 * @author Mike Sollanych
 * @version MDBO3-001
 * @package mdbo3
 */
 
function isValidMDBO($mdbo, $require_id = false) {
	if (!($mdbo instanceof MDBO)) return false;

	if ($require_id && !isValidInt($mdbo->getID())) return false;
	
	return true;
}

function isValidMDBOClass($mdbo_classname) {
	
	// See if the class exists
	if (!class_exists($mdbo_classname)) return false;
	
	// Make one and return whether it's an MDBO or not.
	$mdbo = new $mdbo_classname;
	$retval = ($mdbo instanceof MDBO);
	
	unset($mdbo);
	return $retval;
}
 
function isValidString ($input) {
	return (strlen($input) > 0);
}
 
function isValidInt($input, $deny_zero = true) {
	if (!$deny_zero && ($input == 0)) return true;
	if (strlen($input < 1) || (intval($input) != $input) || !preg_match('/^[0123456789]+$/', $input)) return false;
	return true;
}

function isValidFloat($input) {
	if (trim($input) == "0") return true;
	if (strlen($input) < 1 || !is_numeric($input) || !preg_match('/[0-9]*\.?[0-9]*/', $input)) return false;
	return true;
}

// isValidYear - using a set date range, tells you whether a 4 digit number is a valid year or not. Default range of 99 years.
function isValidYear($input, $four_digit = true, $override_valid_year_range = false) {
	
	if (!isValidInt($input)) return false;
	$digits = $four_digit ? 4 : 2;
	$yearrange = isValidInt($override_valid_year_range) ? $override_valid_year_range : MDBO_VALID_YEAR_RANGE;
	
	if (strlen($input) == $digits) {
		// Check date range for 4 digit only
		if ($four_digit && abs(date('Y') - $input) < $yearrange) return true;
		// 2 digit, any number is fine.
		else return true; 
	}
	return false;
}

// isValidMonth - allows all valid months, 1 through 12.
function isValidMonth($input) {
	if (!isValidInt($input)) return false;
	return ($input >= 1 && $input <= 12);
}

// isValidDay - tells you whether a number is a valid day of a month, month is optional
function isValidDay($input, $month = false) {
	if (!isValidInt($input)) return false;
	$days_in_month = isValidMonth($month)? getMonthDays($month) : MDBO_DEFAULT_DAYS_IN_MONTH;
	return ($input >= 1 && $input <= $days_in_month);
}

// isValidAlpha - allows only letters.
function isValidAlpha($input) {
	return ((strlen($input) > 0) && (preg_match('/^[a-zA-Z]+$/', $input)));
}

// isValidAlphanumeric - allows for all letters, numbers, and space.
function isValidAlphanumeric($input, $allow_space = true) {
	$regex = $allow_space ? '/^[a-zA-Z0-9 ]+$/' : '/^[a-zA-Z0-9]+$/';
	return ((strlen($input) > 0) && (preg_match($regex, $input)));
}

// isValidAlphaNumDash - allows alphanumerics and dashes, no spaces
function isValidAlphaNumDash($input) {
	return ((strlen($input) > 0) && (preg_match('/^[a-zA-Z0-9\-]+$/', $input)));
}

// isValidAlphaNumDashDot - allows alphanumerics, dash, dot, space
function isValidAlphaNumDashDot($input) {
	return ((strlen($input) > 0) && (preg_match('/^[a-zA-Z0-9\-. ]+$/', $input)));
}

// isValidParagraph - allows reasonable characters for a paragraph of English text
function isValidParagraph($input) {
	return ((strlen($input) > 0) && (preg_match('/^[a-zA-Z0-9\-\"\'.!?,;: ]+$/', $input)));
}


// isValidDatetime - allows all valid ISO datetimes: YYYY-MM-DD HH:MM:SS.
function isValidDatetime($input) {
	$regex = "/^(19[0-9]{2}|[2-9][0-9]{3})-((0(1|3|5|7|8)|10|12)-(0[1-9]|1[0-9]|2[0-9]|3[0-1])|(0(4|6|9)|11)-(0[1-9]|1[0-9]|2[0-9]|30)|(02)-(0[1-9]|1[0-9]|2[0-9]))\x20(0[0-9]|1[0-9]|2[0-3])(:[0-5][0-9]){2}$/";
	return preg_match($regex, $input) ? true : false;
}

// isValid10minTime - allows all valid times in 10 minute increments.
function isValid10minTime($input) {
	$regex = "/^[12]?[0-9]\:[0-5]0$/";
	return preg_match($regex, $input) ? true : false;
}

// isValidDate - allows all valid ISO datetimes sans time: YYYY-MM-DD.
function isValidDate($input) {
	$regex = "/^(19[0-9]{2}|[2-9][0-9]{3})[-]?((0(1|3|5|7|8)|10|12)[-]?(0[1-9]|1[0-9]|2[0-9]|3[0-1])|(0(4|6|9)|11)[-]?(0[1-9]|1[0-9]|2[0-9]|30)|(02)[-]?(0[1-9]|1[0-9]|2[0-9]))$/";
	return preg_match($regex, $input) ? true : false;
}

// isValidEmail - allows almost all valid email addresses. It's possible some weird ones are dissallowed... 
function isValidEmail($input) {
	$regex = "/^([0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$/";
	return preg_match($regex, $input) ? true : false;
}

// isValidBool - allows the use of textual booleans. 
function isValidBool($input, $throw_exception = false) {
	if (is_bool($input) || in_array(strtolower($input), Array("true", "false"))) return true;
	else if ($throw_exception) throw new Exception("isValidBool: not a boolean!");
	else return false;
}

// isValidFilename - allows simple filenames only - alphanumerics, dots, underscores and dashes, no spaces
function isValidFilename($input) {
	return ((strlen($input) > 0) && (preg_match('/^[a-zA-Z0-9\-_.]+$/', $input)));
}

// isAssocArray - allows only associative arrays
function isAssocArray($arr) {
	if (!is_array($arr)) return false;
    return array_keys($arr) != range(0, count($arr) - 1);
}

// isValidSortOrder - allows only ASC or DESC, case insensitive
function isValidSortOrder($sort) {
	return (in_array(strtolower($sort), Array('asc', 'desc')));
}

// isValidDomain - allows only valid domain names
function isValidDomain($domainname) {
	return preg_match('/^([a-z0-9]([-a-z0-9]*[a-z0-9])?\\.)+((a[cdefgilmnoqrstuwxz]|aero|arpa)|(b[abdefghijmnorstvwyz]|biz)|(c[acdfghiklmnorsuvxyz]|cat|com|coop)|d[ejkmoz]|(e[ceghrstu]|edu)|f[ijkmor]|(g[abdefghilmnpqrstuwy]|gov)|h[kmnrtu]|(i[delmnoqrst]|info|int)|(j[emop]|jobs)|k[eghimnprwyz]|l[abcikrstuvy]|(m[acdghklmnopqrstuvwxyz]|mil|mobi|museum)|(n[acefgilopruz]|name|net)|(om|org)|(p[aefghklmnrstwy]|pro)|qa|r[eouw]|s[abcdeghijklmnortvyz]|(t[cdfghjklmnoprtvwz]|travel)|u[agkmsyz]|v[aceginu]|w[fs]|y[etu]|z[amw])$/', $domainname) ? true : false;
}

// isValidHostname - allows only valid hostnames (including full domain)
function isValidHostname($hostname, $full_domain = true) {

	if ($full_domain || strpos($hostname, '.') !== false) {
		$result = preg_match('/^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}$/', $hostname) ? true : false;
	}
	else $result = ((strlen($hostname) > 0) && (preg_match('/^[a-zA-Z0-9_-]+$/', $hostname)));
	
	return $result;
}

// isValidNetgroup - allows for all letters, numbers, and underscore.
function isValidNetgroup($input) {
	return ((strlen($input) > 0) && (preg_match('/^[a-zA-Z0-9_]+$/', $input)));
}

// isValidMACAddress - allows only valid Ethernet MAC Addresses.
function isValidMACAddress($mac) {
	return preg_match('/^([0-9a-fA-F][0-9a-fA-F]:){5}([0-9a-fA-F][0-9a-fA-F])$/', $mac) ? true : false;
}

// isValidIP - allows only valid IPv4 IPs.
function isValidIP($ip) {
	return preg_match('/^((0|1[0-9]{0,2}|2[0-9]{0,1}|2[0-4][0-9]|25[0-5]|[3-9][0-9]{0,1})\.){3}(0|1[0-9]{0,2}|2[0-9]{0,1}|2[0-4][0-9]|25[0-5]|[3-9][0-9]{0,1})$/', $ip) ? true : false;
}

// isValidURL - allows only valid URLs.
function isValidURL($url) {
	// Relative URLs are OK
	if (isValidRelativeURL($url)) return true;
	return filter_var($url, FILTER_VALIDATE_URL) ? true : false;
}	

// isValidRelativeURL - allows relative URLS (/foo/whatever.php?foo=bar)
function isValidRelativeURL($url) {
	return preg_match('/[a-zA-Z0-9_.\/?#=]+/', $url) ? true : false;	
}

// isValidUsername - allows only valid usernames.
function isValidUsername($username) {
	return preg_match('/[a-zA-Z0-9]+/', $username) ? true : false;
}

// isValidLDAPPath - allows LDAP paths, with or without a CN in front.
function isValidLDAPPath($path) {
	return preg_match("/^((CN=(['\w\d\s\-\&amp;\.]+(\\/)*(\\,)*)+,\s*)*(OU=(['\w\d\s\-\&amp;\.]+(\\/)*(\\,)*)+,\s*)*(DC=['\w\d\s\-\&amp;]+[,]*\s*){1,}(DC=['\w\d\s\-\&amp;]+\s*){1})$/", $path) ? true : false;
}

// isValidSQLArray - allows SQL arrays in the format of ["item", "item", "item"]
// Spaces around commas are not required
// Both single and doublequotes are okay but you gotta quote it unless it's a valid number
function isValidSQLArray($arr) {
	// Check for brackets
	if (substr($arr, 0, 1) != "(" || substr($arr, -1) != ")") return false;
	
	// Chop the brackets off
	$arr = substr($arr, 1, -1);
	
	// Explode and check each part
	$arex = explode(",", $arr);
	
	foreach($arex as $aritem) {
		$aritem = trim($aritem);
		
		// Doublequoted string
		if ((substr($aritem, 0, 1) == '"') && (substr($aritem, -1) == '"')) $quotechar = '"';
		
		// Singlequoted string
		else if ((substr($aritem, 0, 1) == "'") && (substr($aritem, -1) == "'")) $quotechar = "'";
		
		// Valid number
		else if (isValidFloat($aritem)) continue;
		
		// Invalid, drop out completely - no valid quoting + not a number
		else return false; 
		
		// Chop the quotes off
		$aritem = substr($aritem, 1, -1);
		
		// Check to see if a quoted string contains its own quote type unescaped
		if (preg_match("/[^\\\\]$quotechar/", $aritem) != 0) return false;
			
	}
	
return true;

function isValidGUID($guid) {
	return preg_match("^(\{{0,1}([0-9a-fA-F]){8}-([0-9a-fA-F]){4}-([0-9a-fA-F]){4}-([0-9a-fA-F]){4}-([0-9a-fA-F]){12}\}{0,1})$", $guid) ? true : false;
}

}

?>