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<?php

/**
 * This file contains the files necessary to display news as an XML feed.
 *
 * Simple Machines Forum (SMF)
 *
 * @package SMF
 * @author Simple Machines http://www.simplemachines.org
 * @copyright 2019 Simple Machines and individual contributors
 * @license http://www.simplemachines.org/about/smf/license.php BSD
 *
 * @version 2.1 RC1
 */

if (!defined('SMF'))
    die('No direct access...');

/**
 * Outputs xml data representing recent information or a profile.
 * Can be passed 4 subactions which decide what is output:
 *  'recent' for recent posts,
 *  'news' for news topics,
 *  'members' for recently registered members,
 *  'profile' for a member's profile.
 * To display a member's profile, a user id has to be given. (;u=1)
 * Outputs an rss feed instead of a proprietary one if the 'type' $_GET
 * parameter is 'rss' or 'rss2'.
 * Accessed via ?action=.xml.
 * Does not use any templates, sub templates, or template layers.
 *
 * uses Stats language file.
 */
function ShowXmlFeed()
{
    global $board, $board_info, $context, $scripturl, $boardurl, $txt, $modSettings, $user_info;
    global $query_this_board, $smcFunc, $settings;

    // If it's not enabled, die.
    if (empty($modSettings['xmlnews_enable']))
        obExit(false);

    loadLanguage('Stats');

    // Default to latest 5.  No more than 255, please.
    $_GET['limit'] = empty($_GET['limit']) || (int) $_GET['limit'] < 1 ? 5 : min((int) $_GET['limit'], 255);

    // Some general metadata for this feed. We'll change some of these values below.
    $feed_meta = array(
        'title' => '',
        'desc' => $txt['xml_rss_desc'],
        'author' => $context['forum_name'],
        'source' => $scripturl,
        'rights' => '© ' . date('Y') . ' ' . $context['forum_name'],
        'icon' => !empty($settings['og_image']) ? $settings['og_image'] : $boardurl . '/favicon.ico',
        'language' => !empty($txt['lang_locale']) ? str_replace("_", "-", substr($txt['lang_locale'], 0, strcspn($txt['lang_locale'], "."))) : 'en',
    );

    // Handle the cases where a board, boards, or category is asked for.
    $query_this_board = 1;
    $context['optimize_msg'] = array(
        'highest' => 'm.id_msg <= b.id_last_msg',
    );
    if (!empty($_REQUEST['c']) && empty($board))
    {
        $_REQUEST['c'] = explode(',', $_REQUEST['c']);
        foreach ($_REQUEST['c'] as $i => $c)
            $_REQUEST['c'][$i] = (int) $c;

        if (count($_REQUEST['c']) == 1)
        {
            $request = $smcFunc['db_query']('', '
                SELECT name
                FROM {db_prefix}categories
                WHERE id_cat = {int:current_category}',
                array(
                    'current_category' => (int) $_REQUEST['c'][0],
                )
            );
            list ($feed_meta['title']) = $smcFunc['db_fetch_row']($request);
            $smcFunc['db_free_result']($request);

            $feed_meta['title'] = ' - ' . strip_tags($feed_meta['title']);
        }

        $request = $smcFunc['db_query']('', '
            SELECT b.id_board, b.num_posts
            FROM {db_prefix}boards AS b
            WHERE b.id_cat IN ({array_int:current_category_list})
                AND {query_see_board}',
            array(
                'current_category_list' => $_REQUEST['c'],
            )
        );
        $total_cat_posts = 0;
        $boards = array();
        while ($row = $smcFunc['db_fetch_assoc']($request))
        {
            $boards[] = $row['id_board'];
            $total_cat_posts += $row['num_posts'];
        }
        $smcFunc['db_free_result']($request);

        if (!empty($boards))
            $query_this_board = 'b.id_board IN (' . implode(', ', $boards) . ')';

        // Try to limit the number of messages we look through.
        if ($total_cat_posts > 100 && $total_cat_posts > $modSettings['totalMessages'] / 15)
            $context['optimize_msg']['lowest'] = 'm.id_msg >= ' . max(0, $modSettings['maxMsgID'] - 400 - $_GET['limit'] * 5);
    }
    elseif (!empty($_REQUEST['boards']))
    {
        $_REQUEST['boards'] = explode(',', $_REQUEST['boards']);
        foreach ($_REQUEST['boards'] as $i => $b)
            $_REQUEST['boards'][$i] = (int) $b;

        $request = $smcFunc['db_query']('', '
            SELECT b.id_board, b.num_posts, b.name
            FROM {db_prefix}boards AS b
            WHERE b.id_board IN ({array_int:board_list})
                AND {query_see_board}
            LIMIT {int:limit}',
            array(
                'board_list' => $_REQUEST['boards'],
                'limit' => count($_REQUEST['boards']),
            )
        );

        // Either the board specified doesn't exist or you have no access.
        $num_boards = $smcFunc['db_num_rows']($request);
        if ($num_boards == 0)
            fatal_lang_error('no_board');

        $total_posts = 0;
        $boards = array();
        while ($row = $smcFunc['db_fetch_assoc']($request))
        {
            if ($num_boards == 1)
                $feed_meta['title'] = ' - ' . strip_tags($row['name']);

            $boards[] = $row['id_board'];
            $total_posts += $row['num_posts'];
        }
        $smcFunc['db_free_result']($request);

        if (!empty($boards))
            $query_this_board = 'b.id_board IN (' . implode(', ', $boards) . ')';

        // The more boards, the more we're going to look through...
        if ($total_posts > 100 && $total_posts > $modSettings['totalMessages'] / 12)
            $context['optimize_msg']['lowest'] = 'm.id_msg >= ' . max(0, $modSettings['maxMsgID'] - 500 - $_GET['limit'] * 5);
    }
    elseif (!empty($board))
    {
        $request = $smcFunc['db_query']('', '
            SELECT num_posts
            FROM {db_prefix}boards
            WHERE id_board = {int:current_board}
            LIMIT 1',
            array(
                'current_board' => $board,
            )
        );
        list ($total_posts) = $smcFunc['db_fetch_row']($request);
        $smcFunc['db_free_result']($request);

        $feed_meta['title'] = ' - ' . strip_tags($board_info['name']);
        $feed_meta['source'] .= '?board=' . $board . '.0';

        $query_this_board = 'b.id_board = ' . $board;

        // Try to look through just a few messages, if at all possible.
        if ($total_posts > 80 && $total_posts > $modSettings['totalMessages'] / 10)
            $context['optimize_msg']['lowest'] = 'm.id_msg >= ' . max(0, $modSettings['maxMsgID'] - 600 - $_GET['limit'] * 5);
    }
    else
    {
        $query_this_board = '{query_see_board}' . (!empty($modSettings['recycle_enable']) && $modSettings['recycle_board'] > 0 ? '
            AND b.id_board != ' . $modSettings['recycle_board'] : '');
        $context['optimize_msg']['lowest'] = 'm.id_msg >= ' . max(0, $modSettings['maxMsgID'] - 100 - $_GET['limit'] * 5);
    }

    // Show in rss or proprietary format?
    $xml_format = isset($_GET['type']) && in_array($_GET['type'], array('smf', 'rss', 'rss2', 'atom', 'rdf')) ? $_GET['type'] : 'rss2';

    // @todo Birthdays?

    // List all the different types of data they can pull.
    $subActions = array(
        'recent' => array('getXmlRecent', 'recent-post'),
        'news' => array('getXmlNews', 'article'),
        'members' => array('getXmlMembers', 'member'),
        'profile' => array('getXmlProfile', null),
    );

    // Easy adding of sub actions
    call_integration_hook('integrate_xmlfeeds', array(&$subActions));

    if (empty($_GET['sa']) || !isset($subActions[$_GET['sa']]))
        $_GET['sa'] = 'recent';

    // We only want some information, not all of it.
    $cachekey = array($xml_format, $_GET['action'], $_GET['limit'], $_GET['sa']);
    foreach (array('board', 'boards', 'c') as $var)
        if (isset($_REQUEST[$var]))
            $cachekey[] = $_REQUEST[$var];
    $cachekey = md5($smcFunc['json_encode']($cachekey) . (!empty($query_this_board) ? $query_this_board : ''));
    $cache_t = microtime(true);

    // Get the associative array representing the xml.
    if (!empty($modSettings['cache_enable']) && (!$user_info['is_guest'] || $modSettings['cache_enable'] >= 3))
        $xml_data = cache_get_data('xmlfeed-' . $xml_format . ':' . ($user_info['is_guest'] ? '' : $user_info['id'] . '-') . $cachekey, 240);
    if (empty($xml_data))
    {
        $call = call_helper($subActions[$_GET['sa']][0], true);

        if (!empty($call))
            $xml_data = call_user_func($call, $xml_format);

        if (!empty($modSettings['cache_enable']) && (($user_info['is_guest'] && $modSettings['cache_enable'] >= 3)
        || (!$user_info['is_guest'] && (microtime(true) - $cache_t > 0.2))))
            cache_put_data('xmlfeed-' . $xml_format . ':' . ($user_info['is_guest'] ? '' : $user_info['id'] . '-') . $cachekey, $xml_data, 240);
    }

    $feed_meta['title'] = $smcFunc['htmlspecialchars'](strip_tags($context['forum_name'])) . (isset($feed_meta['title']) ? $feed_meta['title'] : '');

    // Allow mods to add extra namespaces and tags to the feed/channel
    $namespaces = array(
        'rss' => array(),
        'rss2' => array('atom' => 'http://www.w3.org/2005/Atom'),
        'atom' => array('' => 'http://www.w3.org/2005/Atom'),
        'rdf' => array(
            '' => 'http://purl.org/rss/1.0/',
            'rdf' => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
            'dc' => 'http://purl.org/dc/elements/1.1/',
        ),
        'smf' => array(
            '' => 'http://www.simplemachines.org/xml/' . $_GET['sa'],
            'smf' => 'http://www.simplemachines.org/',
        ),
    );
    $extraFeedTags = array(
        'rss' => array(),
        'rss2' => array(),
        'atom' => array(),
        'rdf' => array(),
        'smf' => array(),
    );

    // Allow mods to specify any keys that need special handling
    $forceCdataKeys = array();
    $nsKeys = array();

    // Remember this, just in case...
    $orig_feed_meta = $feed_meta;

    // If mods want to do somthing with this feed, let them do that now.
    // Provide the feed's data, metadata, namespaces, extra feed-level tags, keys that need special handling, the feed format, and the requested subaction
    call_integration_hook('integrate_xml_data', array(&$xml_data, &$feed_meta, &$namespaces, &$extraFeedTags, &$forceCdataKeys, &$nsKeys, $xml_format, $_GET['sa']));

    // These can't be empty
    foreach (array('title', 'desc', 'source') as $mkey)
        $feed_meta[$mkey] = !empty($feed_meta[$mkey]) ? $feed_meta[$mkey] : $orig_feed_meta[$mkey];

    // Sanitize basic feed metadata values
    foreach ($feed_meta as $mkey => $mvalue)
        $feed_meta[$mkey] = cdata_parse(strip_tags(fix_possible_url($feed_meta[$mkey])));

    $ns_string = '';
    if (!empty($namespaces[$xml_format]))
    {
        foreach ($namespaces[$xml_format] as $nsprefix => $nsurl)
            $ns_string .= ' xmlns' . ($nsprefix !== '' ? ':' : '') . $nsprefix . '="' . $nsurl . '"';
    }

    $extraFeedTags_string = '';
    if (!empty($extraFeedTags[$xml_format]))
    {
        $indent = "\t" . ($xml_format !== 'atom' ? "\t" : '');
        foreach ($extraFeedTags[$xml_format] as $extraTag)
            $extraFeedTags_string .= "\n" . $indent . $extraTag;
    }

    // This is an xml file....
    ob_end_clean();
    if (!empty($modSettings['enableCompressedOutput']))
        @ob_start('ob_gzhandler');
    else
        ob_start();

    if ($xml_format == 'smf' || isset($_REQUEST['debug']))
        header('content-type: text/xml; charset=' . (empty($context['character_set']) ? 'ISO-8859-1' : $context['character_set']));
    elseif ($xml_format == 'rss' || $xml_format == 'rss2')
        header('content-type: application/rss+xml; charset=' . (empty($context['character_set']) ? 'ISO-8859-1' : $context['character_set']));
    elseif ($xml_format == 'atom')
        header('content-type: application/atom+xml; charset=' . (empty($context['character_set']) ? 'ISO-8859-1' : $context['character_set']));
    elseif ($xml_format == 'rdf')
        header('content-type: ' . (isBrowser('ie') ? 'text/xml' : 'application/rdf+xml') . '; charset=' . (empty($context['character_set']) ? 'ISO-8859-1' : $context['character_set']));

    // First, output the xml header.
    echo '<?xml version="1.0" encoding="', $context['character_set'], '"?' . '>';

    // Are we outputting an rss feed or one with more information?
    if ($xml_format == 'rss' || $xml_format == 'rss2')
    {
        if ($xml_format == 'rss2')
            foreach ($_REQUEST as $var => $val)
                if (in_array($var, array('action', 'sa', 'type', 'board', 'boards', 'c', 'u', 'limit')))
                    $url_parts[] = $var . '=' . (is_array($val) ? implode(',', $val) : $val);

        // Start with an RSS 2.0 header.
        echo '
<rss version=', $xml_format == 'rss2' ? '"2.0"' : '"0.92"', ' xml:lang="', strtr($txt['lang_locale'], '_', '-'), '"', $ns_string, '>
    <channel>
        <title>', $feed_meta['title'], '</title>
        <link>', $feed_meta['source'], '</link>
        <description>', $feed_meta['desc'], '</description>',
        !empty($feed_meta['icon']) ? '
        <image>
            <url>' . $feed_meta['icon'] . '</url>
            <title>' . $feed_meta['title'] . '</title>
            <link>' . $feed_meta['source'] . '</link>
        </image>' : '',
        !empty($feed_meta['rights']) ? '
        <copyright>' . $feed_meta['rights'] . '</copyright>' : '',
        !empty($feed_meta['language']) ? '
        <language>' . $feed_meta['language'] . '</language>' : '';

        // RSS2 calls for this.
        if ($xml_format == 'rss2')
            echo '
        <atom:link rel="self" type="application/rss+xml" href="', $scripturl, !empty($url_parts) ? '?' . implode(';', $url_parts) : '', '" />';

        echo $extraFeedTags_string;

        // Output all of the associative array, start indenting with 2 tabs, and name everything "item".
        dumpTags($xml_data, 2, null, $xml_format, $forceCdataKeys, $nsKeys);

        // Output the footer of the xml.
        echo '
    </channel>
</rss>';
    }
    elseif ($xml_format == 'atom')
    {
        foreach ($_REQUEST as $var => $val)
            if (in_array($var, array('action', 'sa', 'type', 'board', 'boards', 'c', 'u', 'limit')))
                $url_parts[] = $var . '=' . (is_array($val) ? implode(',', $val) : $val);

        echo '
<feed', $ns_string, !empty($feed_meta['language']) ? ' xml:lang="' . $feed_meta['language'] . '"' : '', '>
    <title>', $feed_meta['title'], '</title>
    <link rel="alternate" type="text/html" href="', $feed_meta['source'], '" />
    <link rel="self" type="application/atom+xml" href="', $scripturl, !empty($url_parts) ? '?' . implode(';', $url_parts) : '', '" />
    <updated>', gmstrftime('%Y-%m-%dT%H:%M:%SZ'), '</updated>
    <id>', $feed_meta['source'], '</id>
    <subtitle>', $feed_meta['desc'], '</subtitle>
    <generator uri="https://www.simplemachines.org" version="', SMF_VERSION, '">SMF</generator>',
    !empty($feed_meta['icon']) ? '
    <icon>' . $feed_meta['icon'] . '</icon>' : '',
    !empty($feed_meta['author']) ? '
    <author>
        <name>' . $feed_meta['author'] . '</name>
    </author>' : '',
    !empty($feed_meta['rights']) ? '
    <rights>' . $feed_meta['rights'] . '</rights>' : '';

        echo $extraFeedTags_string;

        dumpTags($xml_data, 1, null, $xml_format, $forceCdataKeys, $nsKeys);

        echo '
</feed>';
    }
    elseif ($xml_format == 'rdf')
    {
        echo '
<rdf:RDF', $ns_string, '>
    <channel rdf:about="', $scripturl, '">
        <title>', $feed_meta['title'], '</title>
        <link>', $feed_meta['source'], '</link>
        <description>', $feed_meta['desc'], '</description>';

        echo $extraFeedTags_string;

        echo '
        <items>
            <rdf:Seq>';

        foreach ($xml_data as $item)
        {
            $link = array_filter($item['content'], function($e)
            {
                return ($e['tag'] == 'link');
            });
            $link = array_pop($link);

            echo '
                <rdf:li rdf:resource="', $link['content'], '" />';
        }

        echo '
            </rdf:Seq>
        </items>
    </channel>
';

        dumpTags($xml_data, 1, null, $xml_format, $forceCdataKeys, $nsKeys);

        echo '
</rdf:RDF>';
    }
    // Otherwise, we're using our proprietary formats - they give more data, though.
    else
    {
        echo '
<smf:xml-feed xml:lang="', strtr($txt['lang_locale'], '_', '-'), '"', $ns_string, '>';

        // Hard to imagine anyone wanting to add these for the proprietary format, but just in case...
        echo $extraFeedTags_string;

        // Dump out that associative array.  Indent properly.... and use the right names for the base elements.
        dumpTags($xml_data, 1, $subActions[$_GET['sa']][1], $xml_format, $forceCdataKeys, $nsKeys);

        echo '
</smf:xml-feed>';
    }

    obExit(false);
}

/**
 * Called from dumpTags to convert data to xml
 * Finds urls for local site and sanitizes them
 *
 * @param string $val A string containing a possible URL
 * @return string $val The string with any possible URLs sanitized
 */
function fix_possible_url($val)
{
    global $modSettings, $context, $scripturl;

    if (substr($val, 0, strlen($scripturl)) != $scripturl)
        return $val;

    call_integration_hook('integrate_fix_url', array(&$val));

    if (empty($modSettings['queryless_urls']) || ($context['server']['is_cgi'] && ini_get('cgi.fix_pathinfo') == 0 && @get_cfg_var('cgi.fix_pathinfo') == 0) || (!$context['server']['is_apache'] && !$context['server']['is_lighttpd']))
        return $val;

    $val = preg_replace_callback('~\b' . preg_quote($scripturl, '~') . '\?((?:board|topic)=[^#"]+)(#[^"]*)?$~', function($m) use ($scripturl)
    {
        return $scripturl . '/' . strtr("$m[1]", '&;=', '//,') . '.html' . (isset($m[2]) ? $m[2] : "");
    }, $val);
    return $val;
}

/**
 * Ensures supplied data is properly encapsulated in cdata xml tags
 * Called from getXmlProfile in News.php
 *
 * @param string $data XML data
 * @param string $ns A namespace prefix for the XML data elements (used by mods, maybe)
 * @param boolean $force If true, enclose the XML data in cdata tags no matter what (used by mods, maybe)
 * @return string The XML data enclosed in cdata tags when necessary
 */
function cdata_parse($data, $ns = '', $force = false)
{
    global $smcFunc;

    // Do we even need to do this?
    if (strpbrk($data, '<>&') == false && $force !== true)
        return $data;

    $cdata = '<![CDATA[';

    for ($pos = 0, $n = $smcFunc['strlen']($data); $pos < $n; null)
    {
        $positions = array(
            $smcFunc['strpos']($data, '&', $pos),
            $smcFunc['strpos']($data, ']', $pos),
        );
        if ($ns != '')
            $positions[] = $smcFunc['strpos']($data, '<', $pos);
        foreach ($positions as $k => $dummy)
        {
            if ($dummy === false)
                unset($positions[$k]);
        }

        $old = $pos;
        $pos = empty($positions) ? $n : min($positions);

        if ($pos - $old > 0)
            $cdata .= $smcFunc['substr']($data, $old, $pos - $old);
        if ($pos >= $n)
            break;

        if ($smcFunc['substr']($data, $pos, 1) == '<')
        {
            $pos2 = $smcFunc['strpos']($data, '>', $pos);
            if ($pos2 === false)
                $pos2 = $n;
            if ($smcFunc['substr']($data, $pos + 1, 1) == '/')
                $cdata .= ']]></' . $ns . ':' . $smcFunc['substr']($data, $pos + 2, $pos2 - $pos - 1) . '<![CDATA[';
            else
                $cdata .= ']]><' . $ns . ':' . $smcFunc['substr']($data, $pos + 1, $pos2 - $pos) . '<![CDATA[';
            $pos = $pos2 + 1;
        }
        elseif ($smcFunc['substr']($data, $pos, 1) == ']')
        {
            $cdata .= ']]>&#093;<![CDATA[';
            $pos++;
        }
        elseif ($smcFunc['substr']($data, $pos, 1) == '&')
        {
            $pos2 = $smcFunc['strpos']($data, ';', $pos);
            if ($pos2 === false)
                $pos2 = $n;
            $ent = $smcFunc['substr']($data, $pos + 1, $pos2 - $pos - 1);

            if ($smcFunc['substr']($data, $pos + 1, 1) == '#')
                $cdata .= ']]>' . $smcFunc['substr']($data, $pos, $pos2 - $pos + 1) . '<![CDATA[';
            elseif (in_array($ent, array('amp', 'lt', 'gt', 'quot')))
                $cdata .= ']]>' . $smcFunc['substr']($data, $pos, $pos2 - $pos + 1) . '<![CDATA[';

            $pos = $pos2 + 1;
        }
    }

    $cdata .= ']]>';

    return strtr($cdata, array('<![CDATA[]]>' => ''));
}

/**
 * Formats data retrieved in other functions into xml format.
 * Additionally formats data based on the specific format passed.
 * This function is recursively called to handle sub arrays of data.
 *
 * @param array $data The array to output as xml data
 * @param int $i The amount of indentation to use.
 * @param null|string $tag
 * @param string $xml_format The format to use ('atom', 'rss', 'rss2' or empty for plain XML)
 * @param array $forceCdataKeys A list of keys on which to force cdata wrapping (used by mods, maybe)
 * @param array $nsKeys Key-value pairs of namespace prefixes to pass to cdata_parse() (used by mods, maybe)
 */
function dumpTags($data, $i, $tag = null, $xml_format = '', $forceCdataKeys = array(), $nsKeys = array())
{
    // Wrap the values of these keys into CDATA tags
    $keysToCdata = array(
        'title',
        'name',
        'description',
        'summary',
        'subject',
        'body',
        'username',
        'signature',
        'position',
        'language',
        'gender',
        'blurb',
    );
    if ($xml_format != 'atom')
        $keysToCdata[] = 'category';

    if (!empty($forceCdataKeys))
    {
        $keysToCdata = array_merge($keysToCdata, $forceCdataKeys);
        $keysToCdata = array_unique($keysToCdata);
    }

    // For every array in the data...
    foreach ($data as $element)
    {
        // If a tag was passed, use it instead of the key.
        $key = isset($tag) ? $tag : (isset($element['tag']) ? $element['tag'] : null);
        $val = isset($element['content']) ? $element['content'] : null;
        $attrs = isset($element['attributes']) ? $element['attributes'] : null;

        // Skip it, it's been set to null.
        if ($key === null || ($val === null && $attrs === null))
            continue;

        $forceCdata = in_array($key, $forceCdataKeys);
        $ns = !empty($nsKeys[$key]) ? $nsKeys[$key] : '';

        // First let's indent!
        echo "\n", str_repeat("\t", $i);

        // Beginning tag.
        echo '<', $key;

        if (!empty($attrs))
        {
            foreach ($attrs as $attr_key => $attr_value)
                echo ' ', $attr_key, '="', fix_possible_url($attr_value), '"';
        }

        // If it's empty, simply output an empty element.
        if (empty($val))
        {
            echo ' />';
        }
        else
        {
            echo '>';

            // The element's value.
            if (is_array($val))
            {
                // An array.  Dump it, and then indent the tag.
                dumpTags($val, $i + 1, null, $xml_format, $forceCdataKeys, $nsKeys);
                echo "\n", str_repeat("\t", $i);
            }
            // A string with returns in it.... show this as a multiline element.
            elseif (strpos($val, "\n") !== false)
                echo "\n", in_array($key, $keysToCdata) ? cdata_parse(fix_possible_url($val), $ns, $forceCdata) : fix_possible_url($val), "\n", str_repeat("\t", $i);
            // A simple string.
            else
                echo in_array($key, $keysToCdata) ? cdata_parse(fix_possible_url($val), $ns, $forceCdata) : fix_possible_url($val);

            // Ending tag.
            echo '</', $key, '>';
        }
    }
}

/**
 * Retrieve the list of members from database.
 * The array will be generated to match the format.
 *
 * @todo get the list of members from Subs-Members.
 *
 * @param string $xml_format The format to use. Can be 'atom', 'rdf', 'rss', 'rss2' or 'smf'
 * @return array An array of arrays of feed items. Each array has keys corresponding to the appropriate tags for the specified format.
 */
function getXmlMembers($xml_format)
{
    global $scripturl, $smcFunc;

    if (!allowedTo('view_mlist'))
        return array();

    // Find the most recent members.
    $request = $smcFunc['db_query']('', '
        SELECT id_member, member_name, real_name, date_registered, last_login
        FROM {db_prefix}members
        ORDER BY id_member DESC
        LIMIT {int:limit}',
        array(
            'limit' => $_GET['limit'],
        )
    );
    $data = array();
    while ($row = $smcFunc['db_fetch_assoc']($request))
    {
        // Create a GUID for each member using the tag URI scheme
        $guid = 'tag:' . parse_url($scripturl, PHP_URL_HOST) . ',' . gmdate('Y-m-d', $row['date_registered']) . ':member=' . $row['id_member'];

        // Make the data look rss-ish.
        if ($xml_format == 'rss' || $xml_format == 'rss2')
            $data[] = array(
                'tag' => 'item',
                'content' => array(
                    array(
                        'tag' => 'title',
                        'content' => $row['real_name'],
                    ),
                    array(
                        'tag' => 'link',
                        'content' => $scripturl . '?action=profile;u=' . $row['id_member'],
                    ),
                    array(
                        'tag' => 'comments',
                        'content' => $scripturl . '?action=pm;sa=send;u=' . $row['id_member'],
                    ),
                    array(
                        'tag' => 'pubDate',
                        'content' => gmdate('D, d M Y H:i:s \G\M\T', $row['date_registered']),
                    ),
                    array(
                        'tag' => 'guid',
                        'content' => $guid,
                        'attributes' => array(
                            'isPermaLink' => 'false',
                        ),
                    ),
                ),
            );
        elseif ($xml_format == 'rdf')
            $data[] = array(
                'tag' => 'item',
                'attributes' => array('rdf:about' => $scripturl . '?action=profile;u=' . $row['id_member']),
                'content' => array(
                    array(
                        'tag' => 'dc:format',
                        'content' => 'text/html',
                    ),
                    array(
                        'tag' => 'title',
                        'content' => $row['real_name'],
                    ),
                    array(
                        'tag' => 'link',
                        'content' => $scripturl . '?action=profile;u=' . $row['id_member'],
                    ),
                ),
            );
        elseif ($xml_format == 'atom')
            $data[] = array(
                'tag' => 'entry',
                'content' => array(
                    array(
                        'tag' => 'title',
                        'content' => $row['real_name'],
                    ),
                    array(
                        'tag' => 'link',
                        'attributes' => array(
                            'rel' => 'alternate',
                            'type' => 'text/html',
                            'href' => $scripturl . '?action=profile;u=' . $row['id_member'],
                        ),
                    ),
                    array(
                        'tag' => 'published',
                        'content' => gmstrftime('%Y-%m-%dT%H:%M:%SZ', $row['date_registered']),
                    ),
                    array(
                        'tag' => 'updated',
                        'content' => gmstrftime('%Y-%m-%dT%H:%M:%SZ', $row['last_login']),
                    ),
                    array(
                        'tag' => 'id',
                        'content' => $guid,
                    ),
                ),
            );
        // More logical format for the data, but harder to apply.
        else
            $data[] = array(
                'tag' => 'member',
                'content' => array(
                    array(
                        'tag' => 'name',
                        'content' => $row['real_name'],
                    ),
                    array(
                        'tag' => 'time',
                        'content' => $smcFunc['htmlspecialchars'](strip_tags(timeformat($row['date_registered']))),
                    ),
                    array(
                        'tag' => 'id',
                        'content' => $row['id_member'],
                    ),
                    array(
                        'tag' => 'link',
                        'content' => $scripturl . '?action=profile;u=' . $row['id_member'],
                    ),
                ),
            );
    }
    $smcFunc['db_free_result']($request);

    return $data;
}

/**
 * Get the latest topics information from a specific board,
 * to display later.
 * The returned array will be generated to match the xml_format.
 *
 * @todo does not belong here
 *
 * @param string $xml_format The XML format. Can be 'atom', 'rdf', 'rss', 'rss2' or 'smf'.
 * @return array An array of arrays of topic data for the feed. Each array has keys corresponding to the tags for the specified format.
 */
function getXmlNews($xml_format)
{
    global $scripturl, $modSettings, $board, $user_info;
    global $query_this_board, $smcFunc, $context, $txt;

    /* Find the latest posts that:
        - are the first post in their topic.
        - are on an any board OR in a specified board.
        - can be seen by this user.
        - are actually the latest posts. */

    $done = false;
    $loops = 0;
    while (!$done)
    {
        $optimize_msg = implode(' AND ', $context['optimize_msg']);
        $request = $smcFunc['db_query']('', '
            SELECT
                m.smileys_enabled, m.poster_time, m.id_msg, m.subject, m.body, m.modified_time,
                m.icon, t.id_topic, t.id_board, t.num_replies,
                b.name AS bname,
                COALESCE(mem.id_member, 0) AS id_member,
                COALESCE(mem.email_address, m.poster_email) AS poster_email,
                COALESCE(mem.real_name, m.poster_name) AS poster_name
            FROM {db_prefix}topics AS t
                INNER JOIN {db_prefix}messages AS m ON (m.id_msg = t.id_first_msg)
                INNER JOIN {db_prefix}boards AS b ON (b.id_board = t.id_board)
                LEFT JOIN {db_prefix}members AS mem ON (mem.id_member = m.id_member)
            WHERE ' . $query_this_board . (empty($optimize_msg) ? '' : '
                AND {raw:optimize_msg}') . (empty($board) ? '' : '
                AND t.id_board = {int:current_board}') . ($modSettings['postmod_active'] ? '
                AND t.approved = {int:is_approved}' : '') . '
            ORDER BY t.id_first_msg DESC
            LIMIT {int:limit}',
            array(
                'current_board' => $board,
                'is_approved' => 1,
                'limit' => $_GET['limit'],
                'optimize_msg' => $optimize_msg,
            )
        );
        // If we don't have $_GET['limit'] results, try again with an unoptimized version covering all rows.
        if ($loops < 2 && $smcFunc['db_num_rows']($request) < $_GET['limit'])
        {
            $smcFunc['db_free_result']($request);
            if (empty($_REQUEST['boards']) && empty($board))
                unset($context['optimize_msg']['lowest']);
            else
                $context['optimize_msg']['lowest'] = 'm.id_msg >= t.id_first_msg';
            $context['optimize_msg']['highest'] = 'm.id_msg <= t.id_last_msg';
            $loops++;
        }
        else
            $done = true;
    }
    $data = array();
    while ($row = $smcFunc['db_fetch_assoc']($request))
    {
        // Limit the length of the message, if the option is set.
        if (!empty($modSettings['xmlnews_maxlen']) && $smcFunc['strlen'](str_replace('<br>', "\n", $row['body'])) > $modSettings['xmlnews_maxlen'])
            $row['body'] = strtr($smcFunc['substr'](str_replace('<br>', "\n", $row['body']), 0, $modSettings['xmlnews_maxlen'] - 3), array("\n" => '<br>')) . '...';

        $row['body'] = parse_bbc($row['body'], $row['smileys_enabled'], $row['id_msg']);

        censorText($row['body']);
        censorText($row['subject']);

        // Do we want to include any attachments?
        if (!empty($modSettings['attachmentEnable']) && !empty($modSettings['xmlnews_attachments']) && allowedTo('view_attachments', $row['id_board']))
        {
            $attach_request = $smcFunc['db_query']('', '
                SELECT
                    a.id_attach, a.filename, COALESCE(a.size, 0) AS filesize, a.mime_type, a.downloads, a.approved, m.id_topic AS topic
                FROM {db_prefix}attachments AS a
                    LEFT JOIN {db_prefix}messages AS m ON (m.id_msg = a.id_msg)
                WHERE a.attachment_type = {int:attachment_type}
                    AND a.id_msg = {int:message_id}',
                array(
                    'message_id' => $row['id_msg'],
                    'attachment_type' => 0,
                    'is_approved' => 1,
                )
            );
            $loaded_attachments = array();
            while ($attach = $smcFunc['db_fetch_assoc']($attach_request))
            {
                // Include approved attachments only
                if ($attach['approved'])
                    $loaded_attachments['attachment_' . $attach['id_attach']] = $attach;
            }
            $smcFunc['db_free_result']($attach_request);

            // Sort the attachments by size to make things easier below
            if (!empty($loaded_attachments))
            {
                uasort($loaded_attachments, function($a, $b)
                {
                    if ($a['filesize'] == $b['filesize'])
                        return 0;
                    return ($a['filesize'] < $b['filesize']) ? -1 : 1;
                });
            }
            else
                $loaded_attachments = null;
        }
        else
            $loaded_attachments = null;

        // Create a GUID for this topic using the tag URI scheme
        $guid = 'tag:' . parse_url($scripturl, PHP_URL_HOST) . ',' . gmdate('Y-m-d', $row['poster_time']) . ':topic=' . $row['id_topic'];

        // Being news, this actually makes sense in rss format.
        if ($xml_format == 'rss' || $xml_format == 'rss2')
        {
            // Only one attachment allowed in RSS.
            if ($loaded_attachments !== null)
            {
                $attachment = array_pop($loaded_attachments);
                $enclosure = array(
                    'url' => fix_possible_url($scripturl . '?action=dlattach;topic=' . $attachment['topic'] . '.0;attach=' . $attachment['id_attach']),
                    'length' => $attachment['filesize'],
                    'type' => $attachment['mime_type'],
                );
            }
            else
                $enclosure = null;

            $data[] = array(
                'tag' => 'item',
                'content' => array(
                    array(
                        'tag' => 'title',
                        'content' => $row['subject'],
                    ),
                    array(
                        'tag' => 'link',
                        'content' => $scripturl . '?topic=' . $row['id_topic'] . '.0',
                    ),
                    array(
                        'tag' => 'description',
                        'content' => $row['body'],
                    ),
                    array(
                        'tag' => 'author',
                        'content' => (allowedTo('moderate_forum') || $row['id_member'] == $user_info['id']) ? $row['poster_email'] . ' (' . $row['poster_name'] . ')' : null,
                    ),
                    array(
                        'tag' => 'comments',
                        'content' => $scripturl . '?action=post;topic=' . $row['id_topic'] . '.0',
                    ),
                    array(
                        'tag' => 'category',
                        'content' => $row['bname'],
                    ),
                    array(
                        'tag' => 'pubDate',
                        'content' => gmdate('D, d M Y H:i:s \G\M\T', $row['poster_time']),
                    ),
                    array(
                        'tag' => 'guid',
                        'content' => $guid,
                        'attributes' => array(
                            'isPermaLink' => 'false',
                        ),
                    ),
                    array(
                        'tag' => 'enclosure',
                        'attributes' => $enclosure,
                    ),
                ),
            );
        }
        elseif ($xml_format == 'rdf')
        {
            $data[] = array(
                'tag' => 'item',
                'attributes' => array('rdf:about' => $scripturl . '?topic=' . $row['id_topic'] . '.0'),
                'content' => array(
                    array(
                        'tag' => 'dc:format',
                        'content' => 'text/html',
                    ),
                    array(
                        'tag' => 'title',
                        'content' => $row['subject'],
                    ),
                    array(
                        'tag' => 'link',
                        'content' => $scripturl . '?topic=' . $row['id_topic'] . '.0',
                    ),
                    array(
                        'tag' => 'description',
                        'content' => $row['body'],
                    ),
                ),
            );
        }
        elseif ($xml_format == 'atom')
        {
            // Only one attachment allowed
            if (!empty($loaded_attachments))
            {
                $attachment = array_pop($loaded_attachments);
                $enclosure = array(
                    'rel' => 'enclosure',
                    'href' => fix_possible_url($scripturl . '?action=dlattach;topic=' . $attachment['topic'] . '.0;attach=' . $attachment['id_attach']),
                    'length' => $attachment['filesize'],
                    'type' => $attachment['mime_type'],
                );
            }
            else
                $enclosure = null;

            $data[] = array(
                'tag' => 'entry',
                'content' => array(
                    array(
                        'tag' => 'title',
                        'content' => $row['subject'],
                    ),
                    array(
                        'tag' => 'link',
                        'attributes' => array(
                            'rel' => 'alternate',
                            'type' => 'text/html',
                            'href' => $scripturl . '?topic=' . $row['id_topic'] . '.0',
                        ),
                    ),
                    array(
                        'tag' => 'summary',
                        'attributes' => array('type' => 'html'),
                        'content' => $row['body'],
                    ),
                    array(
                        'tag' => 'category',
                        'attributes' => array('term' => $row['bname']),
                    ),
                    array(
                        'tag' => 'author',
                        'content' => array(
                            array(
                                'tag' => 'name',
                                'content' => $row['poster_name'],
                            ),
                            array(
                                'tag' => 'email',
                                'content' => (allowedTo('moderate_forum') || $row['id_member'] == $user_info['id']) ? $row['poster_email'] : null,
                            ),
                            array(
                                'tag' => 'uri',
                                'content' => !empty($row['id_member']) ? $scripturl . '?action=profile;u=' . $row['id_member'] : null,
                            ),
                        )
                    ),
                    array(
                        'tag' => 'published',
                        'content' => gmstrftime('%Y-%m-%dT%H:%M:%SZ', $row['poster_time']),
                    ),
                    array(
                        'tag' => 'updated',
                        'content' => gmstrftime('%Y-%m-%dT%H:%M:%SZ', empty($row['modified_time']) ? $row['poster_time'] : $row['modified_time']),
                    ),
                    array(
                        'tag' => 'id',
                        'content' => $guid,
                    ),
                    array(
                        'tag' => 'link',
                        'attributes' => $enclosure,
                    ),
                ),
            );
        }
        // The biggest difference here is more information.
        else
        {
            $attachments = array();
            if (!empty($loaded_attachments))
            {
                foreach ($loaded_attachments as $attachment)
                {
                    $attachments[] = array(
                        'tag' => 'attachment',
                        'content' => array(
                            array(
                                'tag' => 'id',
                                'content' => $attachment['id_attach'],
                            ),
                            array(
                                'tag' => 'name',
                                'content' => preg_replace('~&amp;#(\\d{1,7}|x[0-9a-fA-F]{1,6});~', '&#\\1;', $smcFunc['htmlspecialchars']($attachment['filename'])),
                            ),
                            array(
                                'tag' => 'downloads',
                                'content' => $attachment['downloads'],
                            ),
                            array(
                                'tag' => 'size',
                                'content' => ($attachment['filesize'] < 1024000) ? round($attachment['filesize'] / 1024, 2) . ' ' . $txt['kilobyte'] : round($attachment['filesize'] / 1024 / 1024, 2) . ' ' . $txt['megabyte'],
                            ),
                            array(
                                'tag' => 'byte_size',
                                'content' => $attachment['filesize'],
                            ),
                            array(
                                'tag' => 'link',
                                'content' => $scripturl . '?action=dlattach;topic=' . $attachment['topic'] . '.0;attach=' . $attachment['id_attach'],
                            ),
                        )
                    );
                }
            }
            else
                $attachments = null;

            $data[] = array(
                'tag' => 'article',
                'content' => array(
                    array(
                        'tag' => 'time',
                        'content' => $smcFunc['htmlspecialchars'](strip_tags(timeformat($row['poster_time']))),
                    ),
                    array(
                        'tag' => 'id',
                        'content' => $row['id_topic'],
                    ),
                    array(
                        'tag' => 'subject',
                        'content' => $row['subject'],
                    ),
                    array(
                        'tag' => 'body',
                        'content' => $row['body'],
                    ),
                    array(
                        'tag' => 'poster',
                        'content' => array(
                            array(
                                'tag' => 'name',
                                'content' => $row['poster_name'],
                            ),
                            array(
                                'tag' => 'id',
                                'content' => $row['id_member'],
                            ),
                            array(
                                'tag' => 'link',
                                'content' => !empty($row['id_member']) ? $scripturl . '?action=profile;u=' . $row['id_member'] : '',
                            ),
                        )
                    ),
                    array(
                        'tag' => 'topic',
                        'content' => $row['id_topic'],
                    ),
                    array(
                        'tag' => 'board',
                        'content' => array(
                            array(
                                'tag' => 'name',
                                'content' => $row['bname'],
                            ),
                            array(
                                'tag' => 'id',
                                'content' => $row['id_board'],
                            ),
                            array(
                                'tag' => 'link',
                                'content' => $scripturl . '?board=' . $row['id_board'] . '.0',
                            ),
                        ),
                    ),
                    array(
                        'tag' => 'link',
                        'content' => $scripturl . '?topic=' . $row['id_topic'] . '.0',
                    ),
                    array(
                        'tag' => 'attachments',
                        'content' => $attachments,
                    ),
                ),
            );
        }
    }
    $smcFunc['db_free_result']($request);

    return $data;
}

/**
 * Get the recent topics to display.
 * The returned array will be generated to match the xml_format.
 *
 * @todo does not belong here.
 *
 * @param string $xml_format The XML format. Can be 'atom', 'rdf', 'rss', 'rss2' or 'smf'
 * @return array An array of arrays containing data for the feed. Each array has keys corresponding to the appropriate tags for the specified format.
 */
function getXmlRecent($xml_format)
{
    global $scripturl, $modSettings, $board, $txt;
    global $query_this_board, $smcFunc, $context, $user_info, $sourcedir;

    require_once($sourcedir . '/Subs-Attachments.php');

    $done = false;
    $loops = 0;
    while (!$done)
    {
        $optimize_msg = implode(' AND ', $context['optimize_msg']);
        $request = $smcFunc['db_query']('', '
            SELECT m.id_msg
            FROM {db_prefix}messages AS m
                INNER JOIN {db_prefix}boards AS b ON (b.id_board = m.id_board)
                INNER JOIN {db_prefix}topics AS t ON (t.id_topic = m.id_topic)
            WHERE ' . $query_this_board . (empty($optimize_msg) ? '' : '
                AND {raw:optimize_msg}') . (empty($board) ? '' : '
                AND m.id_board = {int:current_board}') . ($modSettings['postmod_active'] ? '
                AND m.approved = {int:is_approved}' : '') . '
            ORDER BY m.id_msg DESC
            LIMIT {int:limit}',
            array(
                'limit' => $_GET['limit'],
                'current_board' => $board,
                'is_approved' => 1,
                'optimize_msg' => $optimize_msg,
            )
        );
        // If we don't have $_GET['limit'] results, try again with an unoptimized version covering all rows.
        if ($loops < 2 && $smcFunc['db_num_rows']($request) < $_GET['limit'])
        {
            $smcFunc['db_free_result']($request);
            if (empty($_REQUEST['boards']) && empty($board))
                unset($context['optimize_msg']['lowest']);
            else
                $context['optimize_msg']['lowest'] = $loops ? 'm.id_msg >= t.id_first_msg' : 'm.id_msg >= (t.id_last_msg - t.id_first_msg) / 2';
            $loops++;
        }
        else
            $done = true;
    }
    $messages = array();
    while ($row = $smcFunc['db_fetch_assoc']($request))
        $messages[] = $row['id_msg'];
    $smcFunc['db_free_result']($request);

    if (empty($messages))
        return array();

    // Find the most recent posts this user can see.
    $request = $smcFunc['db_query']('', '
        SELECT
            m.smileys_enabled, m.poster_time, m.id_msg, m.subject, m.body, m.id_topic, t.id_board,
            b.name AS bname, t.num_replies, m.id_member, m.icon, mf.id_member AS id_first_member,
            COALESCE(mem.real_name, m.poster_name) AS poster_name, mf.subject AS first_subject,
            COALESCE(memf.real_name, mf.poster_name) AS first_poster_name,
            COALESCE(mem.email_address, m.poster_email) AS poster_email, m.modified_time
        FROM {db_prefix}messages AS m
            INNER JOIN {db_prefix}topics AS t ON (t.id_topic = m.id_topic)
            INNER JOIN {db_prefix}messages AS mf ON (mf.id_msg = t.id_first_msg)
            INNER JOIN {db_prefix}boards AS b ON (b.id_board = t.id_board)
            LEFT JOIN {db_prefix}members AS mem ON (mem.id_member = m.id_member)
            LEFT JOIN {db_prefix}members AS memf ON (memf.id_member = mf.id_member)
        WHERE m.id_msg IN ({array_int:message_list})
            ' . (empty($board) ? '' : 'AND t.id_board = {int:current_board}') . '
        ORDER BY m.id_msg DESC
        LIMIT {int:limit}',
        array(
            'limit' => $_GET['limit'],
            'current_board' => $board,
            'message_list' => $messages,
        )
    );
    $data = array();
    while ($row = $smcFunc['db_fetch_assoc']($request))
    {
        // Limit the length of the message, if the option is set.
        if (!empty($modSettings['xmlnews_maxlen']) && $smcFunc['strlen'](str_replace('<br>', "\n", $row['body'])) > $modSettings['xmlnews_maxlen'])
            $row['body'] = strtr($smcFunc['substr'](str_replace('<br>', "\n", $row['body']), 0, $modSettings['xmlnews_maxlen'] - 3), array("\n" => '<br>')) . '...';

        $row['body'] = parse_bbc($row['body'], $row['smileys_enabled'], $row['id_msg']);

        censorText($row['body']);
        censorText($row['subject']);

        // Do we want to include any attachments?
        if (!empty($modSettings['attachmentEnable']) && !empty($modSettings['xmlnews_attachments']) && allowedTo('view_attachments', $row['id_board']))
        {
            $attach_request = $smcFunc['db_query']('', '
                SELECT
                    a.id_attach, a.filename, COALESCE(a.size, 0) AS filesize, a.mime_type, a.downloads, a.approved, m.id_topic AS topic
                FROM {db_prefix}attachments AS a
                    LEFT JOIN {db_prefix}messages AS m ON (m.id_msg = a.id_msg)
                WHERE a.attachment_type = {int:attachment_type}
                    AND a.id_msg = {int:message_id}',
                array(
                    'message_id' => $row['id_msg'],
                    'attachment_type' => 0,
                    'is_approved' => 1,
                )
            );
            $loaded_attachments = array();
            while ($attach = $smcFunc['db_fetch_assoc']($attach_request))
            {
                // Include approved attachments only
                if ($attach['approved'])
                    $loaded_attachments['attachment_' . $attach['id_attach']] = $attach;
            }
            $smcFunc['db_free_result']($attach_request);

            // Sort the attachments by size to make things easier below
            if (!empty($loaded_attachments))
            {
                uasort($loaded_attachments, function($a, $b)
                {
                    if ($a['filesize'] == $b['filesize'])
                        return 0;

                    return ($a['filesize'] < $b['filesize']) ? -1 : 1;
                });
            }
            else
                $loaded_attachments = null;
        }
        else
            $loaded_attachments = null;

        // Create a GUID for this post using the tag URI scheme
        $guid = 'tag:' . parse_url($scripturl, PHP_URL_HOST) . ',' . gmdate('Y-m-d', $row['poster_time']) . ':msg=' . $row['id_msg'];

        // Doesn't work as well as news, but it kinda does..
        if ($xml_format == 'rss' || $xml_format == 'rss2')
        {
            // Only one attachment allowed in RSS.
            if ($loaded_attachments !== null)
            {
                $attachment = array_pop($loaded_attachments);
                $enclosure = array(
                    'url' => fix_possible_url($scripturl . '?action=dlattach;topic=' . $attachment['topic'] . '.0;attach=' . $attachment['id_attach']),
                    'length' => $attachment['filesize'],
                    'type' => $attachment['mime_type'],
                );
            }
            else
                $enclosure = null;

            $data[] = array(
                'tag' => 'item',
                'content' => array(
                    array(
                        'tag' => 'title',
                        'content' => $row['subject'],
                    ),
                    array(
                        'tag' => 'link',
                        'content' => $scripturl . '?topic=' . $row['id_topic'] . '.msg' . $row['id_msg'] . '#msg' . $row['id_msg'],
                    ),
                    array(
                        'tag' => 'description',
                        'content' => $row['body'],
                    ),
                    array(
                        'tag' => 'author',
                        'content' => (allowedTo('moderate_forum') || (!empty($row['id_member']) && $row['id_member'] == $user_info['id'])) ? $row['poster_email'] : null,
                    ),
                    array(
                        'tag' => 'category',
                        'content' => $row['bname'],
                    ),
                    array(
                        'tag' => 'comments',
                        'content' => $scripturl . '?action=post;topic=' . $row['id_topic'] . '.0',
                    ),
                    array(
                        'tag' => 'pubDate',
                        'content' => gmdate('D, d M Y H:i:s \G\M\T', $row['poster_time']),
                    ),
                    array(
                        'tag' => 'guid',
                        'content' => $guid,
                        'attributes' => array(
                            'isPermaLink' => 'false',
                        ),
                    ),
                    array(
                        'tag' => 'enclosure',
                        'attributes' => $enclosure,
                    ),
                ),
            );
        }
        elseif ($xml_format == 'rdf')
        {
            $data[] = array(
                'tag' => 'item',
                'attributes' => array('rdf:about' => $scripturl . '?topic=' . $row['id_topic'] . '.msg' . $row['id_msg'] . '#msg' . $row['id_msg']),
                'content' => array(
                    array(
                        'tag' => 'dc:format',
                        'content' => 'text/html',
                    ),
                    array(
                        'tag' => 'title',
                        'content' => $row['subject'],
                    ),
                    array(
                        'tag' => 'link',
                        'content' => $scripturl . '?topic=' . $row['id_topic'] . '.msg' . $row['id_msg'] . '#msg' . $row['id_msg'],
                    ),
                    array(
                        'tag' => 'description',
                        'content' => $row['body'],
                    ),
                ),
            );
        }
        elseif ($xml_format == 'atom')
        {
            // Only one attachment allowed
            if (!empty($loaded_attachments))
            {
                $attachment = array_pop($loaded_attachments);
                $enclosure = array(
                    'rel' => 'enclosure',
                    'href' => fix_possible_url($scripturl . '?action=dlattach;topic=' . $attachment['topic'] . '.0;attach=' . $attachment['id_attach']),
                    'length' => $attachment['filesize'],
                    'type' => $attachment['mime_type'],
                );
            }
            else
                $enclosure = null;

            $data[] = array(
                'tag' => 'entry',
                'content' => array(
                    array(
                        'tag' => 'title',
                        'content' => $row['subject'],
                    ),
                    array(
                        'tag' => 'link',
                        'attributes' => array(
                            'rel' => 'alternate',
                            'type' => 'text/html',
                            'href' => $scripturl . '?topic=' . $row['id_topic'] . '.msg' . $row['id_msg'] . '#msg' . $row['id_msg'],
                        ),
                    ),
                    array(
                        'tag' => 'summary',
                        'attributes' => array('type' => 'html'),
                        'content' => $row['body'],
                    ),
                    array(
                        'tag' => 'category',
                        'attributes' => array('term' => $row['bname']),
                    ),
                    array(
                        'tag' => 'author',
                        'content' => array(
                            array(
                                'tag' => 'name',
                                'content' => $row['poster_name'],
                            ),
                            array(
                                'tag' => 'email',
                                'content' => (allowedTo('moderate_forum') || (!empty($row['id_member']) && $row['id_member'] == $user_info['id'])) ? $row['poster_email'] : null,
                            ),
                            array(
                                'tag' => 'uri',
                                'content' => !empty($row['id_member']) ? $scripturl . '?action=profile;u=' . $row['id_member'] : null,
                            ),
                        ),
                    ),
                    array(
                        'tag' => 'published',
                        'content' => gmstrftime('%Y-%m-%dT%H:%M:%SZ', $row['poster_time']),
                    ),
                    array(
                        'tag' => 'updated',
                        'content' => gmstrftime('%Y-%m-%dT%H:%M:%SZ', empty($row['modified_time']) ? $row['poster_time'] : $row['modified_time']),
                    ),
                    array(
                        'tag' => 'id',
                        'content' => $guid,
                    ),
                    array(
                        'tag' => 'link',
                        'attributes' => $enclosure,
                    ),
                ),
            );
        }
        // A lot of information here.  Should be enough to please the rss-ers.
        else
        {
            $attachments = array();
            if (!empty($loaded_attachments))
            {
                foreach ($loaded_attachments as $attachment)
                {
                    $attachments[] = array(
                        'tag' => 'attachment',
                        'content' => array(
                            array(
                                'tag' => 'id',
                                'content' => $attachment['id_attach'],
                            ),
                            array(
                                'tag' => 'name',
                                'content' => preg_replace('~&amp;#(\\d{1,7}|x[0-9a-fA-F]{1,6});~', '&#\\1;', $smcFunc['htmlspecialchars']($attachment['filename'])),
                            ),
                            array(
                                'tag' => 'downloads',
                                'content' => $attachment['downloads'],
                            ),
                            array(
                                'tag' => 'size',
                                'content' => ($attachment['filesize'] < 1024000) ? round($attachment['filesize'] / 1024, 2) . ' ' . $txt['kilobyte'] : round($attachment['filesize'] / 1024 / 1024, 2) . ' ' . $txt['megabyte'],
                            ),
                            array(
                                'tag' => 'byte_size',
                                'content' => $attachment['filesize'],
                            ),
                            array(
                                'tag' => 'link',
                                'content' => $scripturl . '?action=dlattach;topic=' . $attachment['topic'] . '.0;attach=' . $attachment['id_attach'],
                            ),
                        )
                    );
                }
            }
            else
                $attachments = null;

            $data[] = array(
                'tag' => 'recent-post',
                'content' => array(
                    array(
                        'tag' => 'time',
                        'content' => $smcFunc['htmlspecialchars'](strip_tags(timeformat($row['poster_time']))),
                    ),
                    array(
                        'tag' => 'id',
                        'content' => $row['id_msg'],
                    ),
                    array(
                        'tag' => 'subject',
                        'content' => $row['subject'],
                    ),
                    array(
                        'tag' => 'body',
                        'content' => $row['body'],
                    ),
                    array(
                        'tag' => 'starter',
                        'content' => array(
                            array(
                                'tag' => 'name',
                                'content' => $row['first_poster_name'],
                            ),
                            array(
                                'tag' => 'id',
                                'content' => $row['id_first_member'],
                            ),
                            array(
                                'tag' => 'link',
                                'content' => !empty($row['id_first_member']) ? $scripturl . '?action=profile;u=' . $row['id_first_member'] : '',
                            ),
                        ),
                    ),
                    array(
                        'tag' => 'poster',
                        'content' => array(
                            array(
                                'tag' => 'name',
                                'content' => $row['poster_name'],
                            ),
                            array(
                                'tag' => 'id',
                                'content' => $row['id_member'],
                            ),
                            array(
                                'tag' => 'link',
                                'content' => !empty($row['id_member']) ? $scripturl . '?action=profile;u=' . $row['id_member'] : '',
                            ),
                        ),
                    ),
                    array(
                        'tag' => 'topic',
                        'content' => array(
                            array(
                                'tag' => 'subject',
                                'content' => $row['first_subject'],
                            ),
                            array(
                                'tag' => 'id',
                                'content' => $row['id_topic'],
                            ),
                            array(
                                'tag' => 'link',
                                'content' => $scripturl . '?topic=' . $row['id_topic'] . '.new#new',
                            ),
                        ),
                    ),
                    array(
                        'tag' => 'board',
                        'content' => array(
                            array(
                                'tag' => 'name',
                                'content' => $row['bname'],
                            ),
                            array(
                                'tag' => 'id',
                                'content' => $row['id_board'],
                            ),
                            array(
                                'tag' => 'link',
                                'content' => $scripturl . '?board=' . $row['id_board'] . '.0',
                            ),
                        ),
                    ),
                    array(
                        'tag' => 'link',
                        'content' => $scripturl . '?topic=' . $row['id_topic'] . '.msg' . $row['id_msg'] . '#msg' . $row['id_msg'],
                    ),
                    array(
                        'tag' => 'attachments',
                        'content' => $attachments,
                    ),
                ),
            );
        }
    }
    $smcFunc['db_free_result']($request);

    return $data;
}

/**
 * Get the profile information for member into an array,
 * which will be generated to match the xml_format.
 *
 * @todo refactor.
 *
 * @param string $xml_format The XML format. Can be 'atom', 'rdf', 'rss', 'rss2' or 'smf'
 * @return array An array profile data
 */
function getXmlProfile($xml_format)
{
    global $scripturl, $memberContext, $user_profile, $user_info;

    // You must input a valid user....
    if (empty($_GET['u']) || !loadMemberData((int) $_GET['u']))
        return array();

    // Make sure the id is a number and not "I like trying to hack the database".
    $_GET['u'] = (int) $_GET['u'];
    // Load the member's contextual information!
    if (!loadMemberContext($_GET['u']) || !allowedTo('profile_view'))
        return array();

    // Okay, I admit it, I'm lazy.  Stupid $_GET['u'] is long and hard to type.
    $profile = &$memberContext[$_GET['u']];

    // Create a GUID for this member using the tag URI scheme
    $guid = 'tag:' . parse_url($scripturl, PHP_URL_HOST) . ',' . gmdate('Y-m-d', $user_profile[$profile['id']]['date_registered']) . ':member=' . $profile['id'];

    if ($xml_format == 'rss' || $xml_format == 'rss2')
    {
        $data[] = array(
            'tag' => 'item',
            'content' => array(
                array(
                    'tag' => 'title',
                    'content' => $profile['name'],
                ),
                array(
                    'tag' => 'link',
                    'content' => $scripturl . '?action=profile;u=' . $profile['id'],
                ),
                array(
                    'tag' => 'description',
                    'content' => isset($profile['group']) ? $profile['group'] : $profile['post_group'],
                ),
                array(
                    'tag' => 'comments',
                    'content' => $scripturl . '?action=pm;sa=send;u=' . $profile['id'],
                ),
                array(
                    'tag' => 'pubDate',
                    'content' => gmdate('D, d M Y H:i:s \G\M\T', $user_profile[$profile['id']]['date_registered']),
                ),
                array(
                    'tag' => 'guid',
                    'content' => $guid,
                    'attributes' => array(
                        'isPermaLink' => 'false',
                    ),
                ),
            )
        );
    }
    elseif ($xml_format == 'rdf')
    {
        $data[] = array(
            'tag' => 'item',
            'attributes' => array('rdf:about' => $scripturl . '?action=profile;u=' . $profile['id']),
            'content' => array(
                array(
                    'tag' => 'dc:format',
                    'content' => 'text/html',
                ),
                array(
                    'tag' => 'title',
                    'content' => $profile['name'],
                ),
                array(
                    'tag' => 'link',
                    'content' => $scripturl . '?action=profile;u=' . $profile['id'],
                ),
                array(
                    'tag' => 'description',
                    'content' => isset($profile['group']) ? $profile['group'] : $profile['post_group'],
                ),
            )
        );
    }
    elseif ($xml_format == 'atom')
    {
        $data[] = array(
            'tag' => 'entry',
            'content' => array(
                array(
                    'tag' => 'title',
                    'content' => $profile['name'],
                ),
                array(
                    'tag' => 'link',
                    'attributes' => array(
                        'rel' => 'alternate',
                        'type' => 'text/html',
                        'href' => $scripturl . '?action=profile;u=' . $profile['id'],
                    ),
                ),
                array(
                    'tag' => 'summary',
                    'attributes' => array('type' => 'html'),
                    'content' => isset($profile['group']) ? $profile['group'] : $profile['post_group'],
                ),
                array(
                    'tag' => 'author',
                    'content' => array(
                        array(
                            'tag' => 'name',
                            'content' => $profile['name'],
                        ),
                        array(
                            'tag' => 'email',
                            'content' => $profile['show_email'] ? $profile['email'] : null,
                        ),
                        array(
                            'tag' => 'uri',
                            'content' => !empty($profile['website']['url']) ? $profile['website']['url'] : null,
                        ),
                    ),
                ),
                array(
                    'tag' => 'published',
                    'content' => gmstrftime('%Y-%m-%dT%H:%M:%SZ', $user_profile[$profile['id']]['date_registered']),
                ),
                array(
                    'tag' => 'updated',
                    'content' => gmstrftime('%Y-%m-%dT%H:%M:%SZ', $user_profile[$profile['id']]['last_login']),
                ),
                array(
                    'tag' => 'id',
                    'content' => $guid,
                ),
            )
        );
    }
    else
    {
        $data = array(
            array(
                'tag' => 'username',
                'content' => $user_info['is_admin'] || $user_info['id'] == $profile['id'] ? $profile['username'] : null,
            ),
            array(
                'tag' => 'name',
                'content' => $profile['name'],
            ),
            array(
                'tag' => 'link',
                'content' => $scripturl . '?action=profile;u=' . $profile['id'],
            ),
            array(
                'tag' => 'posts',
                'content' => $profile['posts'],
            ),
            array(
                'tag' => 'post-group',
                'content' => $profile['post_group'],
            ),
            array(
                'tag' => 'language',
                'content' => $profile['language'],
            ),
            array(
                'tag' => 'last-login',
                'content' => gmdate('D, d M Y H:i:s \G\M\T', $user_profile[$profile['id']]['last_login']),
            ),
            array(
                'tag' => 'registered',
                'content' => gmdate('D, d M Y H:i:s \G\M\T', $user_profile[$profile['id']]['date_registered']),
            ),
            array(
                'tag' => 'gender',
                'content' => !empty($profile['gender']['name']) ? $profile['gender']['name'] : null,
            ),
            array(
                'tag' => 'avatar',
                'content' => !empty($profile['avatar']['url']) ? $profile['avatar']['url'] : null,
            ),
            array(
                'tag' => 'online',
                'content' => !empty($profile['online']['is_online']) ? '' : null,
            ),
            array(
                'tag' => 'signature',
                'content' => !empty($profile['signature']) ? $profile['signature'] : null,
            ),
            array(
                'tag' => 'blurb',
                'content' => !empty($profile['blurb']) ? $profile['blurb'] : null,
            ),
            array(
                'tag' => 'title',
                'content' => !empty($profile['title']) ? $profile['title'] : null,
            ),
            array(
                'tag' => 'position',
                'content' => !empty($profile['group']) ? $profile['group'] : null,
            ),
            array(
                'tag' => 'email',
                'content' => !empty($profile['show_email']) ? $profile['show_email'] : null,
            ),
            array(
                'tag' => 'website',
                'content' => empty($profile['website']['url']) ? null : array(
                    array(
                        'tag' => 'title',
                        'content' => !empty($profile['website']['title']) ? $profile['website']['title'] : null,
                    ),
                    array(
                        'tag' => 'link',
                        'content' => $profile['website']['url'],
                    ),
                ),
            ),
        );

        if (!empty($profile['birth_date']) && substr($profile['birth_date'], 0, 4) != '0000')
        {
            list ($birth_year, $birth_month, $birth_day) = sscanf($profile['birth_date'], '%d-%d-%d');
            $datearray = getdate(forum_time());
            $age = $datearray['year'] - $birth_year - (($datearray['mon'] > $birth_month || ($datearray['mon'] == $birth_month && $datearray['mday'] >= $birth_day)) ? 0 : 1);

            $data[] = array(
                'tag' => 'age',
                'content' => $age,
            );
        }
    }

    // Save some memory.
    unset($profile, $memberContext[$_GET['u']]);

    return $data;
}

?>