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<?php
declare(strict_types=1);
namespace SimpleSAML\Module\core\Auth\Process;
use SimpleSAML\Configuration;
use SimpleSAML\Module;
/**
* Attribute filter for renaming attributes.
*
* @author Olav Morken, UNINETT AS.
* @package SimpleSAMLphp
*/
class AttributeMap extends \SimpleSAML\Auth\ProcessingFilter
{
/**
* Associative array with the mappings of attribute names.
* @var array
*/
private $map = [];
/**
* Should attributes be duplicated or renamed.
* @var bool
*/
private $duplicate = false;
/**
* Initialize this filter, parse configuration
*
* @param array &$config Configuration information about this filter.
* @param mixed $reserved For future use.
*
* @throws \Exception If the configuration of the filter is wrong.
*/
public function __construct(&$config, $reserved)
{
parent::__construct($config, $reserved);
assert(is_array($config));
$mapFiles = [];
foreach ($config as $origName => $newName) {
if (is_int($origName)) {
if ($newName === '%duplicate') {
$this->duplicate = true;
} else {
// no index given, this is a map file
$mapFiles[] = $newName;
}
continue;
}
if (!is_string($origName)) {
throw new \Exception('Invalid attribute name: ' . var_export($origName, true));
}
if (!is_string($newName) && !is_array($newName)) {
throw new \Exception('Invalid attribute name: ' . var_export($newName, true));
}
$this->map[$origName] = $newName;
}
// load map files after we determine duplicate or rename
foreach ($mapFiles as &$file) {
$this->loadMapFile($file);
}
}
/**
* Loads and merges in a file with a attribute map.
*
* @param string $fileName Name of attribute map file. Expected to be in the attributemap directory in the root
* of the SimpleSAMLphp installation, or in the root of a module.
*
* @throws \Exception If the filter could not load the requested attribute map file.
* @return void
*/
private function loadMapFile(string $fileName): void
{
$config = Configuration::getInstance();
$m = explode(':', $fileName);
if (count($m) === 2) {
// we are asked for a file in a module
if (!Module::isModuleEnabled($m[0])) {
throw new \Exception("Module '$m[0]' is not enabled.");
}
$filePath = Module::getModuleDir($m[0]) . '/attributemap/' . $m[1] . '.php';
} else {
$attributenamemapdir = $config->getPathValue('attributenamemapdir', 'attributemap/') ?: 'attributemap/';
$filePath = $attributenamemapdir . $fileName . '.php';
}
if (!file_exists($filePath)) {
throw new \Exception('Could not find attribute map file: ' . $filePath);
}
$attributemap = null;
include($filePath);
if (!is_array($attributemap)) {
throw new \Exception('Attribute map file "' . $filePath . '" didn\'t define an attribute map.');
}
if ($this->duplicate) {
$this->map = array_merge_recursive($this->map, $attributemap);
} else {
$this->map = array_merge($this->map, $attributemap);
}
}
/**
* Apply filter to rename attributes.
*
* @param array &$request The current request.
* @return void
*/
public function process(&$request)
{
assert(is_array($request));
assert(array_key_exists('Attributes', $request));
$mapped_attributes = [];
foreach ($request['Attributes'] as $name => $values) {
if (array_key_exists($name, $this->map)) {
if (!is_array($this->map[$name])) {
if ($this->duplicate) {
$mapped_attributes[$name] = $values;
}
$mapped_attributes[$this->map[$name]] = $values;
} else {
foreach ($this->map[$name] as $to_map) {
$mapped_attributes[$to_map] = $values;
}
if ($this->duplicate && !in_array($name, $this->map[$name], true)) {
$mapped_attributes[$name] = $values;
}
}
} else {
if (array_key_exists($name, $mapped_attributes)) {
continue;
}
$mapped_attributes[$name] = $values;
}
}
$request['Attributes'] = $mapped_attributes;
}
}
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