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<?php
/**
 * Smarty plugin
 *
 * @package    Smarty
 * @subpackage PluginsFunction
 */
/**
 * Smarty {mailto} function plugin
 * Type:     function
 * Name:     mailto
 * Date:     May 21, 2002
 * Purpose:  automate mailto address link creation, and optionally encode them.
 * Params:
 *
 * - address    - (required) - e-mail address
 * - text       - (optional) - text to display, default is address
 * - encode     - (optional) - can be one of:
 *                             * none : no encoding (default)
 *                             * javascript : encode with javascript
 *                             * javascript_charcode : encode with javascript charcode
 *                             * hex : encode with hexadecimal (no javascript)
 * - cc         - (optional) - address(es) to carbon copy
 * - bcc        - (optional) - address(es) to blind carbon copy
 * - subject    - (optional) - e-mail subject
 * - newsgroups - (optional) - newsgroup(s) to post to
 * - followupto - (optional) - address(es) to follow up to
 * - extra      - (optional) - extra tags for the href link
 *
 * Examples:
 *
 * {mailto address="me@domain.com"}
 * {mailto address="me@domain.com" encode="javascript"}
 * {mailto address="me@domain.com" encode="hex"}
 * {mailto address="me@domain.com" subject="Hello to you!"}
 * {mailto address="me@domain.com" cc="you@domain.com,they@domain.com"}
 * {mailto address="me@domain.com" extra='class="mailto"'}
 *
 * @link    http://www.smarty.net/manual/en/language.function.mailto.php {mailto}
 *           (Smarty online manual)
 * @version 1.2
 * @author  Monte Ohrt <monte at ohrt dot com>
 * @author  credits to Jason Sweat (added cc, bcc and subject functionality)
 *
 * @param array $params parameters
 *
 * @return string
 */
function smarty_function_mailto($params)
{
    static $_allowed_encoding = array(
        'javascript' => true,
        'javascript_charcode' => true,
        'hex' => true,
        'none' => true
    );

$extra = '';
    if (empty($params[ 'address' ])) {
        trigger_error("mailto: missing 'address' parameter", E_USER_WARNING);
        return;
    } else {
        $address = $params[ 'address' ];
    }

$text = $address;

// netscape and mozilla do not decode %40 (@) in BCC field (bug?)
    // so, don't encode it.
    $mail_parms = array();
    foreach ($params as $var => $value) {
        switch ($var) {
            case 'cc':
            case 'bcc':
            case 'followupto':
                if (!empty($value)) {
                    $mail_parms[] = $var . '=' . str_replace(array('%40', '%2C'), array('@', ','), rawurlencode($value));
                }
                break;
            case 'subject':
            case 'newsgroups':
                $mail_parms[] = $var . '=' . rawurlencode($value);
                break;
            case 'extra':
            case 'text':
                $$var = $value;
            // no break
            default:
        }
    }

if ($mail_parms) {
        $address .= '?' . join('&', $mail_parms);
    }
    $encode = (empty($params[ 'encode' ])) ? 'none' : $params[ 'encode' ];
    if (!isset($_allowed_encoding[ $encode ])) {
        trigger_error(
            "mailto: 'encode' parameter must be none, javascript, javascript_charcode or hex",
            E_USER_WARNING
        );
        return;
    }

$flags = ENT_QUOTES;
    if (defined('ENT_SUBSTITUTE') && defined('ENT_HTML401')) {
        $flags |= ENT_SUBSTITUTE | ENT_HTML401;
    }

$string = '<a href="mailto:' . htmlspecialchars($address, $flags, Smarty::$_CHARSET) .
        '" ' . $extra . '>' . htmlspecialchars($text, $flags, Smarty::$_CHARSET) . '</a>';

if ($encode === 'javascript') {
        $js_encode = '';
        for ($x = 0, $_length = strlen($string); $x < $_length; $x++) {
            $js_encode .= '%' . bin2hex($string[ $x ]);
        }
        return '<script type="text/javascript">document.write(unescape(\'' . $js_encode . '\'))</script>';
    } elseif ($encode === 'javascript_charcode') {
        for ($x = 0, $_length = strlen($string); $x < $_length; $x++) {
            $ord[] = ord($string[ $x ]);
        }
        return '<script type="text/javascript">document.write(String.fromCharCode(' . implode(',', $ord) . '))</script>';
    } elseif ($encode === 'hex') {
        preg_match('!^(.*)(\?.*)$!', $address, $match);
        if (!empty($match[ 2 ])) {
            trigger_error("mailto: hex encoding does not work with extra attributes. Try javascript.", E_USER_WARNING);
            return;
        }
        $address_encode = '';
        for ($x = 0, $_length = strlen($address); $x < $_length; $x++) {
            if (preg_match('!\w!' . Smarty::$_UTF8_MODIFIER, $address[ $x ])) {
                $address_encode .= '%' . bin2hex($address[ $x ]);
            } else {
                $address_encode .= $address[ $x ];
            }
        }
        $text_encode = '';
        for ($x = 0, $_length = strlen($text); $x < $_length; $x++) {
            $text_encode .= '&#x' . bin2hex($text[ $x ]) . ';';
        }
        $mailto = "mailto:";
        return '<a href="' . $mailto . $address_encode . '" ' . $extra . '>' . $text_encode . '</a>';
    } else {
        // no encoding
        return $string;
    }
}