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|
<?php
/**
* Filter to modify attributes using regular expressions
*
* This filter can modify or replace attributes given a regular expression.
*
* @author Jacob Christiansen, WAYF
* @package simpleSAMLphp
*/
class sspmod_core_Auth_Process_AttributeAlter extends SimpleSAML_Auth_ProcessingFilter {
/**
* Should the pattern found be replaced?
*/
private $replace = FALSE;
/**
* Should the value found be removed?
*/
private $remove = FALSE;
/**
* Pattern to search for.
*/
private $pattern = '';
/**
* String to replace the pattern found with.
*/
private $replacement = FALSE;
/**
* Attribute to search in
*/
private $subject = '';
/**
* Attribute to place the result in.
*/
private $target = '';
/**
* Initialize this filter.
*
* @param array $config Configuration information about this filter.
* @param mixed $reserved For future use.
* @throws SimpleSAML_Error_Exception In case of invalid configuration.
*/
public function __construct($config, $reserved) {
parent::__construct($config, $reserved);
assert('is_array($config)');
// parse filter configuration
foreach ($config as $name => $value) {
if (is_int($name)) {
// check if this is an option
if($value === '%replace') {
$this->replace = TRUE;
} elseif ($value == '%remove') {
$this->remove = TRUE;
} else {
throw new SimpleSAML_Error_Exception('Unknown flag : ' . var_export($value, TRUE));
}
continue;
}
// Unknown flag
if (!is_string($name)) {
throw new SimpleSAML_Error_Exception('Unknown flag : ' . var_export($name, TRUE));
}
// Set pattern
if ($name === 'pattern') {
$this->pattern = $value;
}
// Set replacement
if ($name === 'replacement') {
$this->replacement = $value;
}
// Set subject
if ($name === 'subject') {
$this->subject = $value;
}
// Set target
if ($name === 'target') {
$this->target = $value;
}
}
}
/**
* Apply the filter to modify attributes.
*
* Modify existing attributes with the configured values.
*
* @param array &$request The current request.
* @throws SimpleSAML_Error_Exception In case of invalid configuration.
*/
public function process(&$request) {
assert('is_array($request)');
assert('array_key_exists("Attributes", $request)');
// get attributes from request
$attributes =& $request['Attributes'];
// check that all required params are set in config
if (empty($this->pattern) || empty($this->subject)) {
throw new SimpleSAML_Error_Exception("Not all params set in config.");
}
if (!$this->replace && !$this->remove && $this->replacement === false) {
throw new SimpleSAML_Error_Exception("'replacement' must be set if neither '%replace' nor ".
"'%remove' are set.");
}
if (!$this->replace && $this->replacement === null) {
throw new SimpleSAML_Error_Exception("'%replace' must be set if 'replacement' is null.");
}
if ($this->replace && $this->remove) {
throw new SimpleSAML_Error_Exception("'%replace' and '%remove' cannot be used together.");
}
if (empty($this->target)) {
// use subject as target if target is not set
$this->target = $this->subject;
}
if ($this->subject !== $this->target && $this->remove) {
throw new SimpleSAML_Error_Exception("Cannot use '%remove' when 'target' is different than 'subject'.");
}
if (!array_key_exists($this->subject, $attributes)) {
// if no such subject, stop gracefully
return;
}
if ($this->replace) { // replace the whole value
foreach ($attributes[$this->subject] as &$value) {
$matches = array();
if (preg_match($this->pattern, $value, $matches) > 0) {
$new_value = $matches[0];
if ($this->replacement !== FALSE) {
$new_value = $this->replacement;
}
if ($this->subject === $this->target) {
$value = $new_value;
} else {
$attributes[$this->target][] = $new_value;
}
}
}
} elseif ($this->remove) { // remove the whole value
$removedAttrs = array();
foreach ($attributes[$this->subject] as $value) {
$matches = array();
if (preg_match($this->pattern, $value, $matches) > 0) {
$removedAttrs[] = $value;
}
}
$attributes[$this->target] = array_diff($attributes[$this->subject], $removedAttrs);
if (empty($attributes[$this->target])) {
unset($attributes[$this->target]);
}
} else { // replace only the part that matches
if ($this->subject === $this->target) {
$attributes[$this->target] = preg_replace($this->pattern, $this->replacement,
$attributes[$this->subject]);
} else {
$attributes[$this->target] = array_diff(preg_replace($this->pattern, $this->replacement,
$attributes[$this->subject]),
$attributes[$this->subject]);
}
}
}
}
|
