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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
require_once 'PEAR.php';
require_once 'Util.php';
/**
* Object representation of a part of a LDAP filter.
*
* This Class is not completely compatible to the PERL interface!
*
* The purpose of this class is, that users can easily build LDAP filters
* without having to worry about right escaping etc.
* A Filter is built using several independent filter objects
* which are combined afterwards. This object works in two
* modes, depending how the object is created.
* If the object is created using the {@link create()} method, then this is a leaf-object.
* If the object is created using the {@link combine()} method, then this is a container object.
*
* LDAP filters are defined in RFC-2254 and can be found under
* {@link http://www.ietf.org/rfc/rfc2254.txt}
*
* Here a quick copy&paste example:
* <code>
* $filter0 = Net_LDAP_Filter::create('stars', 'equals', '***');
* $filter_not0 = Net_LDAP_Filter::combine('not', $filter0);
*
* $filter1 = Net_LDAP_Filter::create('gn', 'begins', 'bar');
* $filter2 = Net_LDAP_Filter::create('gn', 'ends', 'baz');
* $filter_comp = Net_LDAP_Filter::combine('or',array($filter_not0, $filter1, $filter2));
*
* echo $filter_comp->asString();
* // This will output: (|(!(stars=\0x5c0x2a\0x5c0x2a\0x5c0x2a))(gn=bar*)(gn=*baz))
* // The stars in $filter0 are treaten as real stars unless you disable escaping.
* </code>
*
* @category Net
* @package Net_LDAP
* @author Benedikt Hallinger <beni@php.net>
* @license http://www.gnu.org/copyleft/lesser.html LGPL
* @version CVS: $Id: Filter.php,v 1.27 2008/06/04 06:12:04 beni Exp $
* @link http://pear.php.net/package/Net_LDAP/
*/
class Net_LDAP_Filter extends PEAR
{
/**
* Storage for combination of filters
*
* This variable holds a array of filter objects
* that should be combined by this filter object.
*
* @access private
* @var array
*/
var $_subfilters = array();
/**
* Match of this filter
*
* If this is a leaf filter, then a matching rule is stored,
* if it is a container, then it is a logical operator
*
* @access private
* @var string
*/
var $_match;
/**
* Single filter
*
* If we operate in leaf filter mode,
* then the constructing method stores
* the filter representation here
*
* @acces private
* @var string
*/
var $_filter;
/**
* Create a new Net_LDAP_Filter object and parse $filter.
*
* This is for PERL Net::LDAP interface.
* Construction of Net_LDAP_Filter objects should happen through either
* {@link create()} or {@link combine()} which give you more control.
* However, you may use the perl iterface if you already have generated filters.
*
* @param string $filter LDAP filter string
*
* @see parse()
*/
function Net_LDAP_Filter($filter = false)
{
// The optional parameter must remain here, because otherwise create() crashes
if (false !== $filter) {
$filter_o = Net_LDAP_Filter::parse($filter);
if (PEAR::isError($filter_o)) {
$this->_filter = $filter_o; // assign error, so asString() can report it
} else {
$this->_filter = $filter_o->asString();
}
}
}
/**
* Constructor of a new part of a LDAP filter.
*
* The following matching rules exists:
* - equals: One of the attributes values is exactly $value
* Please note that case sensitiviness is depends on the
* attributes syntax configured in the server.
* - begins: One of the attributes values must begin with $value
* - ends: One of the attributes values must end with $value
* - contains: One of the attributes values must contain $value
* - any: The attribute can contain any value but must be existent
* - greater: The attributes value is greater than $value
* - less: The attributes value is less than $value
* - greaterOrEqual: The attributes value is greater or equal than $value
* - lessOrEqual: The attributes value is less or equal than $value
* - approx: One of the attributes values is similar to $value
*
* If $escape is set to true (default) then $value will be escaped
* properly. If it is set to false then $value will be treaten as raw value.
*
* Examples:
* <code>
* // This will find entries that contain an attribute "sn" that ends with "foobar":
* $filter = new Net_LDAP_Filter('sn', 'ends', 'foobar');
*
* // This will find entries that contain an attribute "sn" that has any value set:
* $filter = new Net_LDAP_Filter('sn', 'any');
* </code>
*
* @param string $attr_name Name of the attribute the filter should apply to
* @param string $match Matching rule (equals, begins, ends, contains, greater, less, greaterOrEqual, lessOrEqual, approx, any)
* @param string $value (optional) if given, then this is used as a filter
* @param boolean $escape Should $value be escaped? (default: yes, see {@link Net_LDAP_Util::escape_filter_value()} for detailed information)
*
* @return Net_LDAP_Filter|Net_LDAP_Error
*/
function &create($attr_name, $match, $value = '', $escape = true)
{
$leaf_filter = new Net_LDAP_Filter();
if ($escape) {
$array = Net_LDAP_Util::escape_filter_value(array($value));
$value = $array[0];
}
switch (strtolower($match)) {
case 'equals':
$leaf_filter->_filter = '(' . $attr_name . '=' . $value . ')';
break;
case 'begins':
$leaf_filter->_filter = '(' . $attr_name . '=' . $value . '*)';
break;
case 'ends':
$leaf_filter->_filter = '(' . $attr_name . '=*' . $value . ')';
break;
case 'contains':
$leaf_filter->_filter = '(' . $attr_name . '=*' . $value . '*)';
break;
case 'greater':
$leaf_filter->_filter = '(' . $attr_name . '>' . $value . ')';
break;
case 'less':
$leaf_filter->_filter = '(' . $attr_name . '<' . $value . ')';
break;
case 'greaterorequal':
$leaf_filter->_filter = '(' . $attr_name . '>=' . $value . ')';
break;
case 'lessorequal':
$leaf_filter->_filter = '(' . $attr_name . '<=' . $value . ')';
break;
case 'approx':
$leaf_filter->_filter = '(' . $attr_name . '~=' . $value . ')';
break;
case 'any':
$leaf_filter->_filter = '(' . $attr_name . '=*)';
break;
default:
return PEAR::raiseError('Net_LDAP_Filter create error: matching rule "' . $match . '" not known!');
}
return $leaf_filter;
}
/**
* Combine two or more filter objects using a logical operator
*
* This static method combines two or more filter objects and returns one single
* filter object that contains all the others.
* Call this method statically: $filter =& Net_LDAP_Filter('or', array($filter1, $filter2))
* If the array contains filter strings instead of filter objects, we will try to parse them.
*
* @param string $log_op The locicall operator. May be "and", "or", "not" or the subsequent logical equivalents "&", "|", "!"
* @param array|Net_LDAP_Filter $filters array with Net_LDAP_Filter objects
*
* @return Net_LDAP_Filter|Net_LDAP_Error
* @static
*/
function &combine($log_op, $filters)
{
if (PEAR::isError($filters)) {
return $filters;
}
// substitude named operators to logical operators
if ($log_op == 'and') $log_op = '&';
if ($log_op == 'or') $log_op = '|';
if ($log_op == 'not') $log_op = '!';
// tests for sane operation
if ($log_op == '!') {
// Not-combination, here we also accept one filter object or filter string
if (!is_array($filters) && is_a($filters, 'Net_LDAP_Filter')) {
$filters = array($filters); // force array
} elseif (is_string($filters)) {
$filter_o = Net_LDAP_Filter::parse($filters);
if (PEAR::isError($filter_o)) {
$err = PEAR::raiseError('Net_LDAP_Filter combine error: '.$filter_o->getMessage());
return $err;
} else {
$filters = array($filter_o);
}
} else {
$err = PEAR::raiseError('Net_LDAP_Filter combine error: operator is "not" but $filter is not a valid Net_LDAP_Filter nor an array nor a filter string!');
return $err;
}
} elseif ($log_op == '&' || $log_op == '|') {
if (!is_array($filters) || count($filters) < 2) {
$err = PEAR::raiseError('Net_LDAP_Filter combine error: parameter $filters is not an array or contains less than two Net_LDAP_Filter objects!');
return $err;
}
} else {
$err = PEAR::raiseError('Net_LDAP_Filter combine error: logical operator is not known!');
return $err;
}
$combined_filter = new Net_LDAP_Filter();
foreach ($filters as $key => $testfilter) { // check for errors
if (PEAR::isError($testfilter)) {
return $testfilter;
} elseif (is_string($testfilter)) {
// string found, try to parse into an filter object
$filter_o = Net_LDAP_Filter::parse($testfilter);
if (PEAR::isError($filter_o)) {
return $filter_o;
} else {
$filters[$key] = $filter_o;
}
} elseif (!is_a($testfilter, 'Net_LDAP_Filter')) {
$err = PEAR::raiseError('Net_LDAP_Filter combine error: invalid object passed in array $filters!');
return $err;
}
}
$combined_filter->_subfilters = $filters;
$combined_filter->_match = $log_op;
return $combined_filter;
}
/**
* Parse FILTER into a Net_LDAP_Filter object
*
* This parses an filter string into Net_LDAP_Filter objects.
*
* @param string $FILTER The filter string
*
* @access static
* @return Net_LDAP_Filter|Net_LDAP_Error
* @todo Leaf-mode: Do we need to escape at all? what about *-chars?check for the need of encoding values, tackle problems (see code comments)
*/
function parse($FILTER)
{
if (preg_match('/^\((.+?)\)$/', $FILTER, $matches)) {
if (in_array(substr($matches[1], 0, 1), array('!', '|', '&'))) {
// Subfilter processing: pass subfilters to parse() and combine
// the objects using the logical operator detected
// we have now something like "(...)(...)(...)" but at least one part ("(...)").
// extract logical operator and subfilters
$log_op = substr($matches[1], 0, 1);
$remaining_component = substr($matches[1], 1);
// bite off the next filter part and parse
$subfilters = array();
while (preg_match('/^(\(.+?\))(.*)/', $remaining_component, $matches)) {
$remaining_component = $matches[2];
$filter_o = Net_LDAP_Filter::parse($matches[1]);
if (PEAR::isError($filter_o)) {
return $filter_o;
}
array_push($subfilters, $filter_o);
}
// combine subfilters using the logical operator
$filter_o = Net_LDAP_Filter::combine($log_op, $subfilters);
return $filter_o;
} else {
// This is one leaf filter component, do some syntax checks, then escape and build filter_o
// $matches[1] should be now something like "foo=bar"
// detect multiple leaf components
// [TODO] Maybe this will make problems with filters containing brackets inside the value
if (stristr($matches[1], ')(')) {
return PEAR::raiseError("Filter parsing error: invalid filter syntax - multiple leaf components detected!");
} else {
$filter_parts = preg_split('/(?<!\\\\)(=|=~|>|<|>=|<=)/', $matches[1], 2, PREG_SPLIT_DELIM_CAPTURE);
if (count($filter_parts) != 3) {
return PEAR::raiseError("Filter parsing error: invalid filter syntax - unknown matching rule used");
} else {
$filter_o = new Net_LDAP_Filter();
// [TODO]: Do we need to escape at all? what about *-chars user provide and that should remain special?
// I think, those prevent escaping! We need to check against PERL Net::LDAP!
// $value_arr = Net_LDAP_Util::escape_filter_value(array($filter_parts[2]));
// $value = $value_arr[0];
$value = $filter_parts[2];
$filter_o->_filter = '('.$filter_parts[0].$filter_parts[1].$value.')';
return $filter_o;
}
}
}
} else {
// ERROR: Filter components must be enclosed in round brackets
return PEAR::raiseError("Filter parsing error: invalid filter syntax - filter components must be enclosed in round brackets");
}
}
/**
* Get the string representation of this filter
*
* This method runs through all filter objects and creates
* the string representation of the filter. If this
* filter object is a leaf filter, then it will return
* the string representation of this filter.
*
* @return string|Net_LDAP_Error
*/
function asString()
{
if ($this->_isLeaf()) {
$return = $this->_filter;
} else {
$return = '';
foreach ($this->_subfilters as $filter) {
$return = $return.$filter->asString();
}
$return = '(' . $this->_match . $return . ')';
}
return $return;
}
/**
* Alias for perl interface as_string()
*
* @see asString()
*/
function as_string()
{
return $this->asString();
}
/**
* Print the text representation of the filter to FH, or the currently selected output handle if FH is not given
*
* This method is only for compatibility to the perl interface.
* However, the original method was called "print" but due to PHP language restrictions,
* we can't have a print() method.
*
* @param resource $FH (optional) A filehandle resource
*
* @return true|Net_LDAP_Error
*/
function printMe($FH = false)
{
if (!is_resource($FH)) {
if (PEAR::isError($FH)) {
return $FH;
}
$filter_str = $this->asString();
if (PEAR::isError($filter_str)) {
return $filter_str;
} else {
print($filter_str);
}
} else {
$filter_str = $this->asString();
if (PEAR::isError($filter_str)) {
return $filter_str;
} else {
$res = @fwrite($FH, $this->asString());
if ($res == false) {
return PEAR::raiseError("Unable to write filter string to filehandle \$FH!");
}
}
}
return true;
}
/**
* This can be used to escape a string to provide a valid LDAP-Filter.
*
* LDAP will only recognise certain characters as the
* character istself if they are properly escaped. This is
* what this method does.
* The method can be called statically, so you can use it outside
* for your own purposes (eg for escaping only parts of strings)
*
* In fact, this is just a shorthand to {@link Net_LDAP_Util::escape_filter_value()}.
* For upward compatibiliy reasons you are strongly encouraged to use the escape
* methods provided by the Net_LDAP_Util class.
*
* @param string $value Any string who should be escaped
*
* @static
* @return string The string $string, but escaped
* @deprecated Do not use this method anymore, instead use Net_LDAP_Util::escape_filter_value() directly
*/
function escape($value)
{
$return = Net_LDAP_Util::escape_filter_value(array($value));
return $return[0];
}
/**
* Is this a container or a leaf filter object?
*
* @access private
* @return boolean
*/
function _isLeaf()
{
if (count($this->_subfilters) > 0) {
return false; // Container!
} else {
return true; // Leaf!
}
}
}
?>
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