AttributeRealm.php

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<?php

class sspmod_core_Auth_Process_AttributeRealm extends SimpleSAML_Auth_ProcessingFilter {

    private $attributename = 'realm';

    public function __construct($config, $reserved) {
        parent::__construct($config, $reserved);
        assert(is_array($config));

        if (array_key_exists('attributename', $config))
            $this->attributename = $config['attributename'];

    }

    public function process(&$request) {
        assert(is_array($request));
        assert(array_key_exists('Attributes', $request));

        $attributes =& $request['Attributes'];

        if (!array_key_exists('UserID', $request)) {
            throw new Exception('core:AttributeRealm: Missing UserID for this user. Please' .
                ' check the \'userid.attribute\' option in the metadata against the' .
                ' attributes provided by the authentication source.');
        }
        $userID = $request['UserID'];
        $decomposed = explode('@', $userID);
        if (count($decomposed) !== 2) return;
        $request['Attributes'][$this->attributename] = array($decomposed[1]);
    }
}