<?php
/**
 * Smarty plugin
 *
 * @package    Smarty
 * @subpackage PluginsFunction
 */

/**
 * Smarty {mailto} function plugin
 * Type:     function<br>
 * Name:     mailto<br>
 * Date:     May 21, 2002
 * Purpose:  automate mailto address link creation, and optionally encode them.<br>
 * Params:
 * <pre>
 * - 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 hexidecimal (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
 * </pre>
 * Examples:
 * <pre>
 * {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"'}
 * </pre>
 *
 * @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.
    $search = array('%40', '%2C');
    $replace = array('@', ',');
    $mail_parms = array();
    foreach ($params as $var => $value) {
        switch ($var) {
            case 'cc':
            case 'bcc':
            case 'followupto':
                if (!empty($value)) {
                    $mail_parms[] = $var . '=' . str_replace($search, $replace, rawurlencode($value));
                }
                break;

            case 'subject':
            case 'newsgroups':
                $mail_parms[] = $var . '=' . rawurlencode($value);
                break;

            case 'extra':
            case 'text':
                $$var = $value;

            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;
    }
    // FIXME: (rodneyrehm) document.write() excues me what? 1998 has passed!
    if ($encode == 'javascript') {
        $string = 'document.write(\'<a href="mailto:' . $address . '" ' . $extra . '>' . $text . '</a>\');';

        $js_encode = '';
        for ($x = 0, $_length = strlen($string); $x < $_length; $x ++) {
            $js_encode .= '%' . bin2hex($string[ $x ]);
        }

        return '<script type="text/javascript">eval(unescape(\'' . $js_encode . '\'))</script>';
    } elseif ($encode == 'javascript_charcode') {
        $string = '<a href="mailto:' . $address . '" ' . $extra . '>' . $text . '</a>';

        for ($x = 0, $y = strlen($string); $x < $y; $x ++) {
            $ord[] = ord($string[ $x ]);
        }

        $_ret = "<script type=\"text/javascript\" language=\"javascript\">\n" . "{document.write(String.fromCharCode(" .
                implode(',', $ord) . "))" . "}\n" . "</script>\n";

        return $_ret;
    } elseif ($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 = "&#109;&#97;&#105;&#108;&#116;&#111;&#58;";

        return '<a href="' . $mailto . $address_encode . '" ' . $extra . '>' . $text_encode . '</a>';
    } else {
        // no encoding
        return '<a href="mailto:' . $address . '" ' . $extra . '>' . $text . '</a>';
    }
}
