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<?php
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/**
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 * OpenID protocol key-value/comma-newline format parsing and
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 * serialization
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 *
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 * PHP versions 4 and 5
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 *
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 * LICENSE: See the COPYING file included in this distribution.
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 *
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 * @access private
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 * @package OpenID
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 * @author JanRain, Inc. <openid@janrain.com>
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 * @copyright 2005 Janrain, Inc.
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 * @license http://www.gnu.org/copyleft/lesser.html LGPL
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 */
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/**
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 * Container for key-value/comma-newline OpenID format and parsing
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 */
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class Auth_OpenID_KVForm {
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    /**
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     * Convert an OpenID colon/newline separated string into an
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     * associative array
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     *
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     * @static
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     * @access private
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     */
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    function toArray($kvs, $strict=false)
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    {
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        $lines = explode("\n", $kvs);
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        $last = array_pop($lines);
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        if ($last !== '') {
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            array_push($lines, $last);
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            if ($strict) {
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                return false;
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            }
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        }
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        $values = array();
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        for ($lineno = 0; $lineno < count($lines); $lineno++) {
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            $line = $lines[$lineno];
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            $kv = explode(':', $line, 2);
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            if (count($kv) != 2) {
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                if ($strict) {
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                    return false;
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                }
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                continue;
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            }
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            $key = $kv[0];
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            $tkey = trim($key);
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            if ($tkey != $key) {
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                if ($strict) {
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                    return false;
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                }
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            }
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            $value = $kv[1];
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            $tval = trim($value);
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            if ($tval != $value) {
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                if ($strict) {
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                    return false;
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                }
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            }
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            $values[$tkey] = $tval;
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        }
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        return $values;
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    }
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    /**
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     * Convert an array into an OpenID colon/newline separated string
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     *
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     * @static
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     * @access private
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     */
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    function fromArray($values)
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    {
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        if ($values === null) {
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            return null;
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        }
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        ksort($values);
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        $serialized = '';
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        foreach ($values as $key => $value) {
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            if (is_array($value)) {
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                list($key, $value) = array($value[0], $value[1]);
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            }
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            if (strpos($key, ':') !== false) {
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                return null;
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            }
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            if (strpos($key, "\n") !== false) {
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                return null;
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            }
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            if (strpos($value, "\n") !== false) {
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                return null;
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            }
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            $serialized .= "$key:$value\n";
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        }
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        return $serialized;
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    }
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}
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?>