<?php

/* Reminder: always indent with 4 spaces (no tabs). */
// +---------------------------------------------------------------------------+
// | Geeklog 1.8                                                               |
// +---------------------------------------------------------------------------+
// | syndication.php                                                           |
// |                                                                           |
// | Geeklog content syndication administration                                |
// +---------------------------------------------------------------------------+
// | Copyright (C) 2003-2011 by the following authors:                         |
// |                                                                           |
// | Authors: Dirk Haun         - dirk AT haun-online DOT de                   |
// |          Michael Jervis    - mike AT fuckingbrit DOT com                  |
// +---------------------------------------------------------------------------+
// |                                                                           |
// | This program is free software; you can redistribute it and/or             |
// | modify it under the terms of the GNU General Public License               |
// | as published by the Free Software Foundation; either version 2            |
// | of the License, or (at your option) any later version.                    |
// |                                                                           |
// | This program is distributed in the hope that it will be useful,           |
// | but WITHOUT ANY WARRANTY; without even the implied warranty of            |
// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             |
// | GNU General Public License for more details.                              |
// |                                                                           |
// | You should have received a copy of the GNU General Public License         |
// | along with this program; if not, write to the Free Software Foundation,   |
// | Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.           |
// |                                                                           |
// +---------------------------------------------------------------------------+

/**
* Content syndication administration page: Here you can create, edit, and
* delete feeds in various formats for Geeklog and its plugins.
*
*/

/**
* Geeklog common function library
*/
require_once '../lib-common.php';

/**
* Security check to ensure user even belongs on this page
*/
require_once 'auth.inc.php';

$display = '';

if (!SEC_hasRights('syndication.edit')) {
    $display .= COM_siteHeader('menu', $MESSAGE[30])
             . COM_showMessageText($MESSAGE[29], $MESSAGE[30])
             . COM_siteFooter();
    COM_accessLog("User {$_USER['username']} tried to illegally access the content syndication administration screen.");
    COM_output($display);
    exit;
}

/**
* Delete a feed's file
*
* @param    string  filename (without the path) of the feed
* @return   void
*
*/
function deleteFeedFile($filename)
{
    if (! empty($filename)) {
        $feedfile = SYND_getFeedPath($filename);
        if (file_exists($feedfile)) {
            @unlink($feedfile);
        }
    }
}

/**
* Toggle status of a feed from enabled to disabled and back
*
* @param    array   $enabledfeeds   array containing ids of enabled feeds
* @param    array   $visiblefeeds   array containing ids of visible feeds
* @return   void
*
*/
function changeFeedStatus($enabledfeeds, $visiblefeeds)
{
    global $_TABLES;

    $enabled_feed = 0;

    $disabled = array_diff($visiblefeeds, $enabledfeeds);

    // disable feeds
    $in = implode(',', $disabled);
    if (! empty($in)) {
        $sql = "UPDATE {$_TABLES['syndication']} SET is_enabled = 0 WHERE fid IN ($in)";
        DB_query($sql);
    }

    // enable feeds
    $in = implode(',', $enabledfeeds);
    if (! empty($in)) {
        // if we just enabled a feed, figure out which one it was
        $sql = "SELECT fid FROM {$_TABLES['syndication']} WHERE fid IN ($in) AND is_enabled = 0";
        $result = DB_query($sql);
        if (DB_numRows($result) > 0) {
            list($enabled_feed) = DB_fetchArray($result);
        }

        $sql = "UPDATE {$_TABLES['syndication']} SET is_enabled = 1 WHERE fid IN ($in)";
        DB_query($sql);
    }

    // ensure files for disabled feeds are deleted
    $result = DB_query("SELECT filename FROM {$_TABLES['syndication']} WHERE is_enabled = 0");
    $num_feeds_off = DB_numRows($result);
    for ($i = 0; $i < $num_feeds_off; $i++) {
        list($feedfile) = DB_fetchArray($result);
        deleteFeedFile($feedfile);
    }

    // if we enabled a feed, update it
    if ($enabled_feed > 0) {
        SYND_updateFeed($enabled_feed);
    }
}

/**
* Get a list of feed formats from the feed parser factory.
*
* @return   array   array of names of feed formats (and versions)
*
*/
function find_feedFormats ()
{
    global $_CONF;

    // Import the feed handling classes:
    require_once $_CONF['path_system']
                 . '/classes/syndication/parserfactory.class.php';

    $factory = new FeedParserFactory ();
    $formats = $factory->getFeedTypes ();
    sort ($formats);

    return $formats;
}

/**
* Return list of types available for article feeds
*
* @return   array   an array with id/name pairs for every feed
*
*/
function get_articleFeeds()
{
    global $_CONF, $_TABLES, $LANG33;

    $options = array ();

    $sql = "SELECT tid,topic FROM {$_TABLES['topics']} WHERE perm_anon >= 2 ORDER BY ";
    if ($_CONF['sortmethod'] == 'alpha') {
        $sql .= 'topic ASC';
    } else {
        $sql .= 'sortnum';
    }
    $result = DB_query ($sql);
    $num = DB_numRows ($result);

    if ($num > 0) {
        $options[] = array ('id' => '::all',       'name' => $LANG33[23]);
        $options[] = array ('id' => '::frontpage', 'name' => $LANG33[53]);
    }

    for ($i = 0; $i < $num; $i++) {
        $A = DB_fetchArray ($result);
        $options[] = array ('id' => $A['tid'], 'name' => '-- ' . $A['topic']);
    }

    return $options;
}

/**
* List all feeds
*
* @return   string  HTML with the list of all feeds
*
*/
function listfeeds()
{
    global $_CONF, $_TABLES, $LANG_ADMIN, $LANG33, $_IMAGE_TYPE;

    require_once $_CONF['path_system'] . 'lib-admin.php';

    $retval = '';
    $token = SEC_createToken();

    $header_arr = array(      # display 'text' and use table field 'field'
                    array('text' => $LANG_ADMIN['edit'], 'field' => 'edit', 'sort' => false),
                    array('text' => $LANG_ADMIN['title'], 'field' => 'title', 'sort' => true),
                    array('text' => $LANG_ADMIN['type'], 'field' => 'type', 'sort' => true),
                    array('text' => $LANG33[17], 'field' => 'format', 'sort' => true),
                    array('text' => $LANG33[16], 'field' => 'filename', 'sort' => true),
                    array('text' => $LANG_ADMIN['topic'], 'field' => 'header_tid', 'sort' => true),
                    array('text' => $LANG33[18], 'field' => 'updated', 'sort' => true),
                    array('text' => $LANG_ADMIN['enabled'], 'field' => 'is_enabled', 'sort' => true)
    );

    $defsort_arr = array('field' => 'title', 'direction' => 'asc');

    $menu_arr = array (
                    array('url' => $_CONF['site_admin_url'] . '/syndication.php?mode=edit',
                          'text' => $LANG_ADMIN['create_new']),
                    array('url' => $_CONF['site_admin_url'],
                          'text' => $LANG_ADMIN['admin_home'])
    );

    $retval .= COM_startBlock($LANG33[10], '',
                              COM_getBlockTemplate('_admin_block', 'header'));

    $retval .= ADMIN_createMenu(
        $menu_arr,
        $LANG33[13],
        $_CONF['layout_url'] . '/images/icons/syndication.' . $_IMAGE_TYPE
    );

    $text_arr = array(
        'has_extras' => true,
        'form_url'   => $_CONF['site_admin_url'] . '/syndication.php'
    );

    $query_arr = array('table' => 'syndication',
                       'sql' => "SELECT *,UNIX_TIMESTAMP(updated) AS date FROM {$_TABLES['syndication']} WHERE 1=1",
                       'query_fields' => array('title', 'filename'),
                       'default_filter' => '');

    // this is a dummy variable so we know the form has been used if all feeds
    // should be disabled in order to disable the last one.
    $form_arr = array(
        'top'    => '<input type="hidden" name="' . CSRF_TOKEN . '" value="'
                    . $token . '"' . XHTML . '>',
        'bottom' => '<input type="hidden" name="feedenabler" value="true"'
                    . XHTML . '>'
    );

    $retval .= ADMIN_list('syndication', 'ADMIN_getListField_syndication',
                          $header_arr, $text_arr, $query_arr, $defsort_arr, '',
                          $token, '', $form_arr);
    $retval .= COM_endBlock(COM_getBlockTemplate('_admin_block', 'footer'));

    return $retval;
}

/**
* Display the feed editor.
*
* @param    int      $fid    feed id (0 for new feeds)
* @param    string   $type   type of feed, e.g. 'article'
* @return   string           HTML for the feed editor
*
*/
function editfeed ($fid = 0, $type = '')
{
    global $_CONF, $_TABLES, $LANG33, $LANG_ADMIN, $MESSAGE;

    if ($fid > 0) {
        $result = DB_query ("SELECT *,UNIX_TIMESTAMP(updated) AS date FROM {$_TABLES['syndication']} WHERE fid = '$fid'");
        $A = DB_fetchArray ($result);
        $fid = $A['fid'];
    }
    if ($fid == 0) {
        if (!empty ($type)) { // set defaults
            $A['fid'] = $fid;
            $A['type'] = $type;
            $A['topic'] = '::all';
            $A['header_tid'] = 'none';
            $A['format'] = 'RSS-2.0';
            $A['limits'] = $_CONF['rdf_limit'];
            $A['content_length'] = $_CONF['rdf_storytext'];
            $A['title'] = $_CONF['site_name'];
            $A['description'] = $_CONF['site_slogan'];
            $A['feedlogo'] = '';
            $A['filename'] = '';
            $A['charset'] = $_CONF['default_charset'];
            $A['language'] = $_CONF['rdf_language'];
            $A['is_enabled'] = 1;
            $A['updated'] = '';
            $A['update_info'] = '';
            $A['date'] = time();
        } else {
            return COM_refresh ($_CONF['site_admin_url'] . '/syndication.php');
        }
    }

    $retval = '';
    $token = SEC_createToken();

    $feed_template = COM_newTemplate($_CONF['path_layout'] . 'admin/syndication');
    $feed_template->set_file ('editor', 'feededitor.thtml');

    $start_block = COM_startBlock($LANG33[24], '',
                        COM_getBlockTemplate('_admin_block', 'header'));
    $start_block .= SEC_getTokenExpiryNotice($token);

    $feed_template->set_var('start_feed_editor', $start_block);
    $feed_template->set_var('end_block',
            COM_endBlock(COM_getBlockTemplate('_admin_block', 'footer')));

    $feed_template->set_var ('lang_feedtitle', $LANG33[25]);
    $feed_template->set_var ('lang_enabled', $LANG33[19]);
    $feed_template->set_var ('lang_format', $LANG33[17]);
    $feed_template->set_var ('lang_limits', $LANG33[26]);
    $feed_template->set_var ('lang_content_length', $LANG33[27]);
    $feed_template->set_var ('lang_clen_explain', $LANG33[28]);
    $feed_template->set_var ('lang_description', $LANG33[29]);
    $feed_template->set_var ('lang_feedlogo', $LANG33[49]);
    $feed_template->set_var ('lang_feedlogo_explain', $LANG33[50]);
    $feed_template->set_var ('lang_filename', $LANG33[16]);
    $feed_template->set_var ('lang_updated', $LANG33[30]);
    $feed_template->set_var ('lang_type', $LANG33[15]);
    $feed_template->set_var ('lang_charset', $LANG33[31]);
    $feed_template->set_var ('lang_language', $LANG33[32]);
    $feed_template->set_var ('lang_topic', $LANG33[33]);

    if ($A['header_tid'] == 'all') {
        $feed_template->set_var('all_selected', 'selected="selected"');
    } elseif ($A['header_tid'] == 'none') {
        $feed_template->set_var('none_selected', 'selected="selected"');
    }

    $feed_template->set_var('lang_header_all', $LANG33[43]);
    $feed_template->set_var('lang_header_none', $LANG33[44]);
    $feed_template->set_var('lang_header_topic', $LANG33[45]);
    $feed_template->set_var('header_topic_options',
                        COM_topicList('tid,topic', $A['header_tid'], 1, true));
    $feed_template->set_var('lang_save', $LANG_ADMIN['save']);
    $feed_template->set_var('lang_cancel', $LANG_ADMIN['cancel']);
    if ($A['fid'] > 0) {
        $delbutton = '<input type="submit" value="' . $LANG_ADMIN['delete']
                   . '" name="mode"%s' . XHTML . '>';
        $jsconfirm = ' onclick="return confirm(\'' . $MESSAGE[76] . '\');"';
        $feed_template->set_var ('delete_option',
                                 sprintf ($delbutton, $jsconfirm));
        $feed_template->set_var ('delete_option_no_confirmation',
                                 sprintf ($delbutton, ''));
    }
    $feed_template->set_var ('feed_id', $A['fid']);
    $feed_template->set_var ('feed_title', $A['title']);
    $feed_template->set_var ('feed_description', $A['description']);
    $feed_template->set_var ('feed_logo', $A['feedlogo']);
    $feed_template->set_var ('feed_content_length', $A['content_length']);
    $feed_template->set_var ('feed_filename', $A['filename']);
    $feed_template->set_var ('feed_type', $A['type']);
    if ($A['type'] == 'article') {
        $feed_template->set_var('feed_type_display', $LANG33[55]);
    } else {
        $feed_template->set_var('feed_type_display', ucwords($A['type']));
    }
    $feed_template->set_var ('feed_charset', $A['charset']);
    $feed_template->set_var ('feed_language', $A['language']);

    if (($A['is_enabled'] == 1) && !empty($A['updated'])) {
        $nicedate = COM_getUserDateTimeFormat($A['date']);
        $feed_template->set_var('feed_updated', $nicedate[0]);
    } else {
        $feed_template->set_var('feed_updated', $LANG_ADMIN['na']);
    }

    $formats = find_feedFormats ();
    $selection = '<select name="format">' . LB;
    foreach ($formats as $f) {
        // if one changes this format below ('name-version'), also change parsing
        // in COM_siteHeader. It uses explode( "-" , $string )
        $selection .= '<option value="' . $f['name'] . '-' . $f['version']
                   . '"';
        if ($A['format'] == $f['name'] . '-' . $f['version']) {
            $selection .= ' selected="selected"';
        }
        $selection .= '>' . ucwords ($f['name'] . ' ' . $f['version'])
                   . '</option>' . LB;
    }
    $selection .= '</select>' . LB;
    $feed_template->set_var ('feed_format', $selection);

    $limits = $A['limits'];
    $hours = false;
    if (substr ($A['limits'], -1) == 'h') {
        $limits = substr ($A['limits'], 0, -1);
        $hours = true;
    }
    $selection = '<select name="limits_in">' . LB;
    $selection .= '<option value="0"';
    if (!$hours) {
        $selection .= ' selected="selected"';
    }
    $selection .= '>' . $LANG33[34] . '</option>' . LB;
    $selection .= '<option value="1"';
    if ($hours) {
        $selection .= ' selected="selected"';
    }
    $selection .= '>' . $LANG33[35] . '</option>' . LB;
    $selection .= '</select>' . LB;
    $feed_template->set_var ('feed_limits', $limits);
    $feed_template->set_var ('feed_limits_what', $selection);

    if ($A['type'] == 'article') {
        $options = get_articleFeeds();
    } else {
        $result = DB_query("SELECT pi_enabled FROM {$_TABLES['plugins']} WHERE pi_name='{$A['type']}'");
        if($result)
        {
            $P = DB_fetchArray($result);
            if($P['pi_enabled'] == 0)
            {
                echo COM_refresh($_CONF['site_admin_url'].'/syndication.php?msg=80');
                exit;
            }
        }
        $options = PLG_getFeedNames ($A['type']);
    }
    $selection = '<select name="topic">' . LB;
    foreach ($options as $o) {
        $selection .= '<option value="' . $o['id'] . '"';
        if ($A['topic'] == $o['id']) {
            $selection .= ' selected="selected"';
        }
        $selection .= '>' . $o['name'] . '</option>' . LB;
    }
    $selection .= '</select>' . LB;
    $feed_template->set_var ('feed_topic', $selection);

    if ($A['is_enabled'] == 1) {
        $feed_template->set_var ('is_enabled', 'checked="checked"');
    } else {
        $feed_template->set_var ('is_enabled', '');
    }
    $feed_template->set_var('gltoken_name', CSRF_TOKEN);
    $feed_template->set_var('gltoken', $token);

    $retval .= $feed_template->finish($feed_template->parse('output',
                                                            'editor'));
    return $retval;
}

/**
* Create a new feed. This is an extra step to take once you have a plugin
* installed that supports the new Feed functions in the Plugin API. This
* will let you select for which plugin (or Geeklog) you're creating the feed.
*
* @return   string   HTML for the complete page (selection or feed editor)
*
*/
function newfeed ()
{
    global $_CONF, $LANG33;

    $retval = '';

    $plugins = PLG_supportingFeeds ();
    if (count($plugins) == 0) {
        // none of the installed plugins are supporting feeds
        // - go directly to the feed editor
        $retval = COM_siteHeader ('menu', $LANG33[11])
                . editfeed (0, 'article')
                . COM_siteFooter ();
    } else {
        $selection = '<select name="type">' . LB;
        $selection .= '<option value="article">' . $LANG33[55]
                   . '</option>' . LB;
        foreach ($plugins as $p) {
            $selection .= '<option value="' . $p . '">' . ucwords ($p)
                       . '</option>' . LB;
        }
        $selection .= '</select>' . LB;

        $feed_template = COM_newTemplate($_CONF['path_layout'] . 'admin/syndication');
        $feed_template->set_file ('type', 'selecttype.thtml');

        $feed_template->set_var ('type_selection', $selection);

        $feed_template->set_var ('lang_explain', $LANG33[54]);
        $feed_template->set_var ('lang_go', $LANG33[1]);

        $retval .= COM_siteHeader ('menu', $LANG33[11]);
        $retval .= COM_startBlock ($LANG33[36], '',
                COM_getBlockTemplate ('_admin_block', 'header'));
        $retval .= $feed_template->finish ($feed_template->parse ('output',
                                                                  'type'));
        $retval .= COM_endBlock (COM_getBlockTemplate ('_admin_block', 'footer'));
        $retval .= COM_siteFooter ();
    }

    return $retval;
}

/**
* Save feed.
*
* @param    array    $A
* @return   string   HTML redirect on success or feed editor + error message
*
*/
function savefeed ($A)
{
    global $_CONF, $_TABLES, $LANG33;

    foreach ($A as $name => $value) {
        $A[$name] = COM_stripslashes ($value);
    }

    if (isset($A['is_enabled']) && ($A['is_enabled'] == 'on')) {
        $A['is_enabled'] = 1;
    } else {
        $A['is_enabled'] = 0;
    }
    if (empty ($A['title']) || empty ($A['description']) ||
            empty ($A['filename'])) {
        $retval = COM_siteHeader ('menu', $LANG33[38])
                . COM_showMessageText($LANG33[39], $LANG33[38])
                . editfeed ($A['fid'], $A['type'])
                . COM_siteFooter ();
        return $retval;
    }

    $result = DB_query("SELECT COUNT(*) AS count FROM {$_TABLES['syndication']} WHERE filename = '{$A['filename']}' AND (fid <> '{$A['fid']}')");
    $C = DB_fetchArray($result);
    if ($C['count'] > 0) {
        $retval = COM_siteHeader ('menu', $LANG33[52])
                . COM_showMessageText($LANG33[51], $LANG33[52])
                . editfeed ($A['fid'], $A['type'])
                . COM_siteFooter ();
        return $retval;
    }

    if ($A['limits'] <= 0) {
        $retval = COM_siteHeader ('menu', $LANG33[38])
                . COM_showMessageText($LANG33[40], $LANG33[38])
                . editfeed ($A['fid'], $A['type'])
                . COM_siteFooter ();
        return $retval;
    }
    if ($A['limits_in'] == 1) {
        $A['limits'] .= 'h';
    }

    // we can compensate if these are missing ...
    if (empty ($A['charset'])) {
        $A['charset'] = $_CONF['default_charset'];
        if (empty ($A['charset'])) {
            $A['charset'] = 'UTF-8';
        }
    }
    if (empty ($A['language'])) {
        $A['language'] = $_CONF['rdf_language'];
        if (empty ($A['language'])) {
            $A['language'] = $_CONF['locale'];
        }
    }
    if (empty ($A['content_length']) || ($A['content_length'] < 0)) {
        $A['content_length'] = 0;
    }

    foreach ($A as $name => $value) {
        $A[$name] = addslashes ($value);
    }

    DB_save($_TABLES['syndication'], 'fid,type,topic,header_tid,format,limits,content_length,title,description,feedlogo,filename,charset,language,is_enabled,updated,update_info',
        "{$A['fid']},'{$A['type']}','{$A['topic']}','{$A['header_tid']}','{$A['format']}','{$A['limits']}',{$A['content_length']},'{$A['title']}','{$A['description']}','{$A['feedlogo']}','{$A['filename']}','{$A['charset']}','{$A['language']}',{$A['is_enabled']},'0000-00-00 00:00:00',NULL");

    if ($A['fid'] == 0) {
        $A['fid'] = DB_insertId();
    }
    if ($A['is_enabled'] == 1) {
        SYND_updateFeed($A['fid']);
    } else {
        deleteFeedFile($A['filename']);
    }

    return COM_refresh($_CONF['site_admin_url'] . '/syndication.php?msg=58');
}

/**
* Delete a feed.
*
* @param    int      $fid   feed id
* @return   string          HTML redirect
*
*/
function deletefeed($fid)
{
    global $_CONF, $_TABLES;

    if ($fid > 0) {
        $feedfile = DB_getItem($_TABLES['syndication'], 'filename',
                               "fid = $fid");
        deleteFeedFile($feedfile);
        DB_delete($_TABLES['syndication'], 'fid', $fid);

        return COM_refresh($_CONF['site_admin_url']
                           . '/syndication.php?msg=59');
    }

    return COM_refresh($_CONF['site_admin_url'] . '/syndication.php');
}


// MAIN
$display = '';

if ($_CONF['backend'] && isset($_POST['feedenabler']) && SEC_checkToken()) {
    $enabledfeeds = array();
    if (isset($_POST['enabledfeeds'])) {
        $enabledfeeds = $_POST['enabledfeeds'];
    }
    $visiblefeeds = array();
    if (isset($_POST['visiblefeeds'])) {
        $visiblefeeds = $_POST['visiblefeeds'];
    }
    changeFeedStatus($enabledfeeds, $visiblefeeds);
}
$mode = '';
if (isset($_REQUEST['mode'])) {
    $mode = $_REQUEST['mode'];
}
if ($mode == 'edit') {
    if (empty ($_REQUEST['fid'])) {
        $display .= newfeed ();
    } else {
        $display .= COM_siteHeader ('menu', $LANG33[24])
                 . editfeed (COM_applyFilter($_REQUEST['fid']))
                 . COM_siteFooter ();
    }
}
elseif (($mode == $LANG33[1]) && !empty ($LANG33[1]))
{
    $display .= COM_siteHeader ('menu', $LANG33[24])
             . editfeed (0, COM_applyFilter($_REQUEST['type']))
             . COM_siteFooter ();
}
elseif (($mode == $LANG_ADMIN['save']) && !empty($LANG_ADMIN['save']) && SEC_checkToken())
{
    $display .= savefeed($_POST);
}
elseif (($mode == $LANG_ADMIN['delete']) && !empty($LANG_ADMIN['delete']) && SEC_checkToken()) {
    $fid = 0;
    if (isset($_POST['fid'])) {
        $fid = COM_applyFilter($_POST['fid'], true);
    }
    $display .= deletefeed($fid);
}
else
{
    $display .= COM_siteHeader('menu', $LANG33[10]);
    $display .= COM_showMessageFromParameter();
    $display .= listfeeds();
    $display .= COM_siteFooter();
}

COM_output($display);

?>
