source: branches/rsr.v5.1.1/web/punbb/include/email.php

<?php

/**
 * Copyright (C) 2008-2011 FluxBB
 * based on code by Rickard Andersson copyright (C) 2002-2008 PunBB
 * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher
 */

// Make sure no one attempts to run this script "directly"
if (!defined('PUN'))
        exit;

require PUN_ROOT.'include/utf8/utils/ascii.php';

//
// Validate an email address
//
function is_valid_email($email)
{
        if (strlen($email) > 80)
                return false;

        return preg_match('%^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|("[^"]+"))@((\[\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\])|(([a-zA-Z\d\-]+\.)+[a-zA-Z]{2,}))$%', $email);
}


//
// Check if $email is banned
//
function is_banned_email($email)
{
        global $pun_bans;

        foreach ($pun_bans as $cur_ban)
        {
                if ($cur_ban['email'] != '' &&
                        ($email == $cur_ban['email'] ||
                        (strpos($cur_ban['email'], '@') === false && stristr($email, '@'.$cur_ban['email']))))
                        return true;
        }

        return false;
}


//
// Only encode with base64, if there is at least one unicode character in the string
//
function encode_mail_text($str)
{
        if (utf8_is_ascii($str))
                return $str;

        return '=?UTF-8?B?'.base64_encode($str).'?=';
}


//
// Make a post email safe
//
function bbcode2email($text, $wrap_length = 72)
{
    static $base_url;

    if (!isset($base_url))
        $base_url = get_base_url();

    $text = pun_trim($text, "\t\n ");

    $shortcut_urls = array(
        'topic' => '/viewtopic.php?id=$1',
        'post' => '/viewtopic.php?pid=$1#p$1',
        'forum' => '/viewforum.php?id=$1',
        'user' => '/profile.php?id=$1',
    );

    // Split code blocks and text so BBcode in codeblocks won't be touched
    list($code, $text) = extract_blocks($text, '[code]', '[/code]');

    // Strip all bbcodes, except the quote, url, img, email, code and list items bbcodes
    $text = preg_replace(array(
        '%\[/?(?!(?:quote|url|topic|post|user|forum|img|email|code|list|\*))[a-z]+(?:=[^\]]+)?\]%i',
        '%\n\[/?list(?:=[^\]]+)?\]%i' // A separate regex for the list tags to get rid of some whitespace
    ), '', $text);

    // Match the deepest nested bbcode
    // An adapted example from Mastering Regular Expressions
    $match_quote_regex = '%
        \[(quote|\*|url|img|email|topic|post|user|forum)(?:=([^\]]+))?\]
        (
            (?>[^\[]*)
            (?>
                (?!\[/?\1(?:=[^\]]+)?\])
                \[
                [^\[]*
            )*
        )
        \[/\1\]
    %ix';

    $url_index = 1;
    $url_stack = array();
    while (preg_match($match_quote_regex, $text, $matches))
    {
        // Quotes
        if ($matches[1] == 'quote')
        {
            // Put '>' or '> ' at the start of a line
            $replacement = preg_replace(
                array('%^(?=\>)%m', '%^(?!\>)%m'),
                array('>', '> '),
                $matches[2]." said:\n".$matches[3]);
        }

        // List items
        elseif ($matches[1] == '*')
        {
            $replacement = ' * '.$matches[3];
        }

        // URLs and emails
        elseif (in_array($matches[1], array('url', 'email')))
        {
            if (!empty($matches[2]))
            {
                $replacement = '['.$matches[3].']['.$url_index.']';
                $url_stack[$url_index] = $matches[2];
                $url_index++;
            }
            else
                $replacement = '['.$matches[3].']';
        }

        // Images
        elseif ($matches[1] == 'img')
        {
            if (!empty($matches[2]))
                $replacement = '['.$matches[2].']['.$url_index.']';
            else
                $replacement = '['.basename($matches[3]).']['.$url_index.']';

            $url_stack[$url_index] = $matches[3];
            $url_index++;
        }

        // Topic, post, forum and user URLs
        elseif (in_array($matches[1], array('topic', 'post', 'forum', 'user')))
        {
            $url = isset($shortcut_urls[$matches[1]]) ? $base_url.$shortcut_urls[$matches[1]] : '';

            if (!empty($matches[2]))
            {
                $replacement = '['.$matches[3].']['.$url_index.']';
                $url_stack[$url_index] = str_replace('$1', $matches[2], $url);
                $url_index++;
            }
            else
                $replacement = '['.str_replace('$1', $matches[3], $url).']';
        }

        // Update the main text if there is a replacment
        if (!is_null($replacement))
        {
            $text = str_replace($matches[0], $replacement, $text);
            $replacement = null;
        }
    }

    // Put code blocks and text together
    if (isset($code))
    {
        $parts = explode("\1", $text);
        $text = '';
        foreach ($parts as $i => $part)
        {
            $text .= $part;
            if (isset($code[$i]))
                $text .= trim($code[$i], "\n\r");
        }
    }

    // Put URLs at the bottom
    if ($url_stack)
    {
        $text .= "\n\n";
        foreach ($url_stack as $i => $url)
            $text .= "\n".' ['.$i.']: '.$url;
    }

    // Wrap lines if $wrap_length is higher than -1
    if ($wrap_length > -1)
    {
        // Split all lines and wrap them individually
        $parts = explode("\n", $text);
        foreach ($parts as $k => $part)
        {
            preg_match('%^(>+ )?(.*)%', $part, $matches);
            $parts[$k] = wordwrap($matches[1].$matches[2], $wrap_length -
                strlen($matches[1]), "\n".$matches[1]);
        }

        return implode("\n", $parts);
    }
    else
        return $text;
}


//
// Wrapper for PHP's mail()
//
function pun_mail($to, $subject, $message, $reply_to_email = '', $reply_to_name = '')
{
        global $pun_config, $lang_common;

        // Default sender/return address
        $from_name = sprintf($lang_common['Mailer'], $pun_config['o_board_title']);
        $from_email = $pun_config['o_webmaster_email'];

        // Do a little spring cleaning
        $to = pun_trim(preg_replace('%[\n\r]+%s', '', $to));
        $subject = pun_trim(preg_replace('%[\n\r]+%s', '', $subject));
        $from_email = pun_trim(preg_replace('%[\n\r:]+%s', '', $from_email));
        $from_name = pun_trim(preg_replace('%[\n\r:]+%s', '', str_replace('"', '', $from_name)));
        $reply_to_email = pun_trim(preg_replace('%[\n\r:]+%s', '', $reply_to_email));
        $reply_to_name = pun_trim(preg_replace('%[\n\r:]+%s', '', str_replace('"', '', $reply_to_name)));

        // Set up some headers to take advantage of UTF-8
        $from = '"'.encode_mail_text($from_name).'" <'.$from_email.'>';
        $subject = encode_mail_text($subject);

        $headers = 'From: '.$from."\r\n".'Date: '.gmdate('r')."\r\n".'MIME-Version: 1.0'."\r\n".'Content-transfer-encoding: 8bit'."\r\n".'Content-type: text/plain; charset=utf-8'."\r\n".'X-Mailer: FluxBB Mailer';

        // If we specified a reply-to email, we deal with it here
        if (!empty($reply_to_email))
        {
                $reply_to = '"'.encode_mail_text($reply_to_name).'" <'.$reply_to_email.'>';

                $headers .= "\r\n".'Reply-To: '.$reply_to;
        }

        // Make sure all linebreaks are LF in message (and strip out any NULL bytes)
        $message = str_replace("\0", '', pun_linebreaks($message));

        if ($pun_config['o_smtp_host'] != '')
        {
                // Headers should be \r\n
                // Message should be ??
                $message = str_replace("\n", "\r\n", $message);
                smtp_mail($to, $subject, $message, $headers);
        }
        else
        {
                // Headers should be \r\n
                // Message should be \n
                mail($to, $subject, $message, $headers);
        }
}


//
// This function was originally a part of the phpBB Group forum software phpBB2 (http://www.phpbb.com)
// They deserve all the credit for writing it. I made small modifications for it to suit PunBB and it's coding standards
//
function server_parse($socket, $expected_response)
{
        $server_response = '';
        while (substr($server_response, 3, 1) != ' ')
        {
                if (!($server_response = fgets($socket, 256)))
                        error('Couldn\'t get mail server response codes. Please contact the forum administrator.', __FILE__, __LINE__);
        }

        if (!(substr($server_response, 0, 3) == $expected_response))
                error('Unable to send email. Please contact the forum administrator with the following error message reported by the SMTP server: "'.$server_response.'"', __FILE__, __LINE__);
}


//
// This function was originally a part of the phpBB Group forum software phpBB2 (http://www.phpbb.com)
// They deserve all the credit for writing it. I made small modifications for it to suit PunBB and it's coding standards.
//
function smtp_mail($to, $subject, $message, $headers = '')
{
        global $pun_config;

        $recipients = explode(',', $to);

        // Sanitize the message
        $message = str_replace("\r\n.", "\r\n..", $message);
        $message = (substr($message, 0, 1) == '.' ? '.'.$message : $message);

        // Are we using port 25 or a custom port?
        if (strpos($pun_config['o_smtp_host'], ':') !== false)
                list($smtp_host, $smtp_port) = explode(':', $pun_config['o_smtp_host']);
        else
        {
                $smtp_host = $pun_config['o_smtp_host'];
                $smtp_port = 25;
        }

        if ($pun_config['o_smtp_ssl'] == '1')
                $smtp_host = 'ssl://'.$smtp_host;

        if (!($socket = fsockopen($smtp_host, $smtp_port, $errno, $errstr, 15)))
                error('Could not connect to smtp host "'.$pun_config['o_smtp_host'].'" ('.$errno.') ('.$errstr.')', __FILE__, __LINE__);

        server_parse($socket, '220');

        if ($pun_config['o_smtp_user'] != '' && $pun_config['o_smtp_pass'] != '')
        {
                fwrite($socket, 'EHLO '.$smtp_host."\r\n");
                server_parse($socket, '250');

                fwrite($socket, 'AUTH LOGIN'."\r\n");
                server_parse($socket, '334');

                fwrite($socket, base64_encode($pun_config['o_smtp_user'])."\r\n");
                server_parse($socket, '334');

                fwrite($socket, base64_encode($pun_config['o_smtp_pass'])."\r\n");
                server_parse($socket, '235');
        }
        else
        {
                fwrite($socket, 'HELO '.$smtp_host."\r\n");
                server_parse($socket, '250');
        }

        fwrite($socket, 'MAIL FROM: <'.$pun_config['o_webmaster_email'].'>'."\r\n");
        server_parse($socket, '250');

        foreach ($recipients as $email)
        {
                fwrite($socket, 'RCPT TO: <'.$email.'>'."\r\n");
                server_parse($socket, '250');
        }

        fwrite($socket, 'DATA'."\r\n");
        server_parse($socket, '354');

        fwrite($socket, 'Subject: '.$subject."\r\n".'To: <'.implode('>, <', $recipients).'>'."\r\n".$headers."\r\n\r\n".$message."\r\n");

        fwrite($socket, '.'."\r\n");
        server_parse($socket, '250');

        fwrite($socket, 'QUIT'."\r\n");
        fclose($socket);

        return true;
}