AttributeValueMap.php

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<?php

namespace SimpleSAML\Module\core\Auth\Process;

class AttributeValueMap extends \SimpleSAML_Auth_ProcessingFilter
{

    private $targetattribute;

    private $sourceattribute;

    private $values = array();
    
    private $keep = false;

    private $replace = false;
    
    public function __construct($config, $reserved)
    {
        parent::__construct($config, $reserved);

        assert('is_array($config)');

        // parse configuration
        foreach ($config as $name => $value) {
            if (is_int($name)) {
                // check if this is an option
                if ($value === '%replace') {
                    $this->replace = true;
                } elseif ($value === '%keep') {
                    $this->keep = true;
                } else {
                    // unknown configuration option, log it and ignore the error
                    \SimpleSAML\Logger::warning(
                        "AttributeValueMap: unknown configuration flag '".var_export($value, true)."'"
                    );
                }
                continue;
            }

            // set the target attribute
            if ($name === 'targetattribute') {
                $this->targetattribute = $value;
            }

            // set the source attribute
            if ($name === 'sourceattribute') {
                $this->sourceattribute = $value;
            }
        
            // set the values
            if ($name === 'values') {
                $this->values = $value;
            }
        }

        // now validate it
        if (!is_string($this->sourceattribute)) {
            throw new \SimpleSAML_Error_Exception("AttributeValueMap: 'sourceattribute' configuration option not set.");
        }
        if (!is_string($this->targetattribute)) {
            throw new \SimpleSAML_Error_Exception("AttributeValueMap: 'targetattribute' configuration option not set.");
        }
        if (!is_array($this->values)) {
            throw new \SimpleSAML_Error_Exception("AttributeValueMap: 'values' configuration option is not an array.");
        }
    }


    public function process(&$request)
    {
        \SimpleSAML\Logger::debug('Processing the AttributeValueMap filter.');

        assert('is_array($request)');
        assert('array_key_exists("Attributes", $request)');
        $attributes =& $request['Attributes'];

        if (!array_key_exists($this->sourceattribute, $attributes)) {
            // the source attribute does not exist, nothing to do here
            return;
        }

        $sourceattribute = $attributes[$this->sourceattribute];
        $targetvalues = array();

        if (is_array($sourceattribute)) {
            foreach ($this->values as $value => $values) {
                if (!is_array($values)) {
                    $values = array($values);
                }
                if (count(array_intersect($values, $sourceattribute)) > 0) {
                    \SimpleSAML\Logger::debug("AttributeValueMap: intersect match for '$value'");
                    $targetvalues[] = $value;
                }
            }
        }

        if (count($targetvalues) > 0) {
            if ($this->replace || !array_key_exists($this->targetattribute, $attributes)) {
                $attributes[$this->targetattribute] = $targetvalues;
            } else {
                $attributes[$this->targetattribute] = array_unique(array_merge(
                    $attributes[$this->targetattribute],
                    $targetvalues
                ));
            }
        }

        if (!$this->keep) {
            // no need to keep the source attribute
            unset($attributes[$this->sourceattribute]);
        }
    }
}