<?php

/*

 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between

 * Copyright (C) 2006-2007 Dan Fuhry

 *

 * This program is Free Software; you can redistribute 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 details.

 */

/**

 * Class that handles comments. Has HTML/Javascript frontend support.

 * @package Enano CMS

 * @subpackage Comment manager

 * @license GNU General Public License <http://www.gnu.org/licenses/gpl.html>

 */

class Comments

{

  #

  # VARIABLES

  #

  /**

   * Current list of comments.

   * @var array

   */

  var $comments = Array();

  /**

   * Object to track permissions.

   * @var object

   */

  var $perms;

  #

  # METHODS

  #

  /**

   * Constructor.

   * @param string Page ID of the page to load comments for

   * @param string Namespace of the page to load comments for

   */

  function __construct($page_id, $namespace)

  {

    global $db, $session, $paths, $template, $plugins; // Common objects

    // Initialize permissions

    if ( $page_id == $paths->page_id && $namespace == $paths->namespace )

      $this->perms =& $GLOBALS['session'];

    else

      $this->perms = $session->fetch_page_acl($page_id, $namespace);

    $this->page_id = $db->escape($page_id);

    $this->namespace = $db->escape($namespace);

  }

  /**

   * Processes a command in JSON format.

   * @param string The JSON-encoded input, probably something sent from the Javascript/AJAX frontend

   */

  function process_json($json)

  {

    global $db, $session, $paths, $template, $plugins; // Common objects

    $data = enano_json_decode($json);

    $data = decode_unicode_array($data);

    if ( !isset($data['mode']) )

    {

      $ret = Array('mode'=>'error','error'=>'No mode defined!');

      echo enano_json_encode($ret);

      return $ret;

    }

    if ( getConfig('enable_comments') == '0' )

    {

      $ret = Array('mode'=>'error','error'=>'Comments are not enabled on this site.');

      echo enano_json_encode($ret);

      return $ret;

    }

    $ret = Array();

    $ret['mode'] = $data['mode'];

    $ret['avatar_directory'] = getConfig('avatar_directory');

    switch ( $data['mode'] )

    {

      case 'fetch':

        if ( !$template->theme_loaded )

          $template->load_theme();

        if ( !isset($data['have_template']) )

        {

          $ret['template'] = file_get_contents(ENANO_ROOT . '/themes/' . $template->theme . '/comment.tpl');

        }

        $q = $db->sql_query('SELECT c.comment_id,c.name,c.subject,c.comment_data,c.time,c.approved,( c.ip_address IS NOT NULL ) AS have_ip,u.user_level,u.user_id,u.signature,u.user_has_avatar,u.avatar_type, b.buddy_id IS NOT NULL AS is_buddy, ( b.is_friend IS NOT NULL AND b.is_friend=1 ) AS is_friend FROM '.table_prefix.'comments AS c

                               LEFT JOIN '.table_prefix.'users AS u

                                 ON (u.user_id=c.user_id)

                               LEFT JOIN '.table_prefix.'buddies AS b

                                 ON ( ( b.user_id=' . $session->user_id.' AND b.buddy_user_id=c.user_id ) OR b.user_id IS NULL)

                               WHERE page_id=\'' . $this->page_id . '\'

                                 AND namespace=\'' . $this->namespace . '\'

                               GROUP BY c.comment_id,c.name,c.subject,c.comment_data,c.time,c.approved,c.ip_address,u.user_level,u.user_id,u.signature,u.user_has_avatar,u.avatar_type,b.buddy_id,b.is_friend

                               ORDER BY c.time ASC;');

        $count_appr = 0;

        $count_total = 0;

        $count_unappr = 0;

        $ret['comments'] = Array();

        if (!$q)

          $db->die_json();

        if ( $row = $db->fetchrow() )

        {

          do {

            // Increment counters

            $count_total++;

            ( $row['approved'] == 1 ) ? $count_appr++ : $count_unappr++;

            if ( !$this->perms->get_permissions('mod_comments') && $row['approved'] == 0 )

              continue;

            // Send the source

            $row['comment_source'] = $row['comment_data'];

            // Format text

            $row['comment_data'] = RenderMan::render($row['comment_data']);

            if ( $row['is_buddy'] == 1 && $row['is_friend'] == 0 )

            {

              $seed = md5(sha1(mt_rand() . microtime()));

              $wrapper = '

                <div id="posthide_'.$seed.'" style="display: none;">

                  ' . $row['comment_data'] . '

                </div>

                <p><span style="opacity: 0.4; filter: alpha(opacity=40);">Post from foe hidden.</span> <span style="text-align: right;"><a href="#showpost" onclick="document.getElementById(\'posthide_'.$seed.'\').style.display=\'block\'; this.parentNode.parentNode.parentNode.removeChild(this.parentNode.parentNode); return false;">Display post</a></span></p>

              ';

              $row['comment_data'] = $wrapper;

            }

            // Format date

            $row['time'] = enano_date('F d, Y h:i a', $row['time']);

            // Format signature

            $row['signature'] = ( !empty($row['signature']) ) ? RenderMan::render($row['signature']) : '';

            // Do we have the IP?

            $row['have_ip'] = ( $row['have_ip'] == 1 );

            // Add the comment to the list

            $ret['comments'][] = $row;

          } while ( $row = $db->fetchrow() );

        }

        $db->free_result();

        $ret['count_appr'] = $count_appr;

        $ret['count_total'] = $count_total;

        $ret['count_unappr'] = $count_unappr;

        $ret['auth_mod_comments'] = $this->perms->get_permissions('mod_comments');

        $ret['auth_post_comments'] = $this->perms->get_permissions('post_comments');

        $ret['auth_edit_comments'] = $this->perms->get_permissions('edit_comments');

        $ret['user_id'] = $session->user_id;

        $ret['username'] = $session->username;

        $ret['logged_in'] = $session->user_logged_in;

        $ret['user_level'] = Array();

        $ret['user_level']['guest'] = USER_LEVEL_GUEST;

        $ret['user_level']['member'] = USER_LEVEL_MEMBER;

        $ret['user_level']['mod'] = USER_LEVEL_MOD;

        $ret['user_level']['admin'] = USER_LEVEL_ADMIN;

        $ret['approval_needed'] = ( getConfig('approve_comments') == '1' );

        $ret['guest_posting'] = getConfig('comments_need_login');

        if ( $ret['guest_posting'] == '1' && !$session->user_logged_in )

        {

          $session->kill_captcha();

          $ret['captcha'] = $session->make_captcha();

        }

        break;

      case 'edit':

        $cid = (string)$data['id'];

        if ( !preg_match('#^([0-9]+)$#i', $cid) || intval($cid) < 1 )

        {

          echo '{"mode":"error","error":"HACKING ATTEMPT"}';

          return false;

        }

        $cid = intval($cid);

        $q = $db->sql_query('SELECT c.user_id,c.approved FROM '.table_prefix.'comments c LEFT JOIN '.table_prefix.'users u ON (u.user_id=c.user_id) WHERE comment_id='.$cid.';');

        if(!$q)

          $db->die_json();

        $row = $db->fetchrow();

        $uid = intval($row['user_id']);

        $can_edit = ( ( $uid == $session->user_id && $uid != 1 && $this->perms->get_permissions('edit_comments') ) || ( $this->perms->get_permissions('mod_comments') ) );

        if(!$can_edit)

        {

          echo '{"mode":"error","error":"HACKING ATTEMPT"}';

          return false;

        }

        $data['data'] = str_replace("\r", '', $data['data']); // Windows compatibility

        $text = RenderMan::preprocess_text($data['data'], true, false);

        $text2 = $db->escape($text);

        $subj = $db->escape(htmlspecialchars($data['subj']));

        $q = $db->sql_query('UPDATE '.table_prefix.'comments SET subject=\'' . $subj . '\',comment_data=\'' . $text2 . '\' WHERE comment_id=' . $cid . ';');

        if(!$q)

          $db->die_json();

        $ret = Array(

            'mode' => 'redraw',

            'id'   => $data['local_id'],

            'subj' => htmlspecialchars($data['subj']),

            'text' => RenderMan::render($text),

            'src'  => $text,

            'approved' => $row['approved']

          );

        break;

      case 'delete':

        $cid = (string)$data['id'];

        if ( !preg_match('#^([0-9]+)$#i', $cid) || intval($cid) < 1 )

        {

          echo '{"mode":"error","error":"HACKING ATTEMPT"}';

          return false;

        }

        $cid = intval($cid);

        $q = $db->sql_query('SELECT c.user_id FROM '.table_prefix.'comments c LEFT JOIN '.table_prefix.'users u ON (u.user_id=c.user_id) WHERE comment_id='.$cid.';');

        if(!$q)

          $db->die_json();

        $row = $db->fetchrow();

        $uid = intval($row['user_id']);

        $can_edit = ( ( $uid == $session->user_id && $uid != 1 && $this->perms->get_permissions('edit_comments') ) || ( $this->perms->get_permissions('mod_comments') ) );

        if(!$can_edit)

        {

          echo '{"mode":"error","error":"HACKING ATTEMPT"}';

          return false;

        }

        $q = $db->sql_query('DELETE FROM '.table_prefix.'comments WHERE comment_id='.$cid.';');

        if(!$q)

          $db->die_json();

        $ret = Array(

            'mode' => 'annihilate',

            'id'   => $data['local_id']

          );

        break;

      case 'submit':

        // Now for a huge round of security checks...

        $errors = Array();

        // Authorization

        // Like the rest of the ACL system, this call is a one-stop check for ALL ACL entries.

        if ( !$this->perms->get_permissions('post_comments') )

          $errors[] = 'The site security policy prevents your user account from posting comments;';

        // Guest authorization

        if ( getConfig('comments_need_login') == '2' && !$session->user_logged_in )

          $errors[] = 'You need to log in before posting comments.';

        // CAPTCHA code

        if ( getConfig('comments_need_login') == '1' && !$session->user_logged_in )

        {

          $real_code = $session->get_captcha($data['captcha_id']);

          if ( $real_code != $data['captcha_code'] )

            $errors[] = 'The confirmation code you entered was incorrect.';

          $session->kill_captcha();

        }

        if ( count($errors) > 0 )

        {

          $ret = Array(

            'mode' => 'error',

            'error' => implode("\n", $errors)

            );

        }

        else

        {

          // We're authorized!

          // Preprocess

          $name = ( $session->user_logged_in ) ? htmlspecialchars($session->username) : htmlspecialchars($data['name']);

          $subj = htmlspecialchars($data['subj']);

          $text = RenderMan::preprocess_text($data['text'], true, false);

          $src = $text;

          $sql_text = $db->escape($text);

          $text = RenderMan::render($text);

          $appr = ( getConfig('approve_comments') == '1' ) ? '0' : '1';

          $time = time();

          $date = enano_date('F d, Y h:i a', $time);

          $ip = $_SERVER['REMOTE_ADDR'];

          if ( !is_valid_ip($ip) )

            die('Hacking attempt');

          // Send it to the database

          $q = $db->sql_query('INSERT INTO '.table_prefix.'comments(page_id,namespace,name,subject,comment_data,approved, time, user_id, ip_address) VALUES' . "\n  " .

                             "('$this->page_id', '$this->namespace', '$name', '$subj', '$sql_text', $appr, $time, {$session->user_id}, '$ip');");

          if(!$q)

            $db->die_json();

          // Re-fetch

          $q = $db->sql_query('SELECT c.comment_id,c.name,c.subject,c.comment_data,c.time,c.approved,u.user_level,u.user_id,u.signature,u.user_has_avatar,u.avatar_type FROM '.table_prefix.'comments AS c

                               LEFT JOIN '.table_prefix.'users AS u

                                 ON (u.user_id=c.user_id)

                               WHERE page_id=\'' . $this->page_id . '\'

                                 AND namespace=\'' . $this->namespace . '\'

                                 AND time='.$time.' ORDER BY comment_id DESC LIMIT 1;');

          if(!$q)

            $db->die_json();

          $row = $db->fetchrow();

          $db->free_result();

          $row['time'] = $date;

          $row['comment_data'] = $text;

          $row['comment_source'] = $src;

          $ret = Array(

              'mode' => 'materialize'

            );

          $ret = enano_safe_array_merge($ret, $row);

          $ret['auth_mod_comments'] = $this->perms->get_permissions('mod_comments');

          $ret['auth_post_comments'] = $this->perms->get_permissions('post_comments');

          $ret['auth_edit_comments'] = $this->perms->get_permissions('edit_comments');

          $ret['user_id'] = $session->user_id;

          $ret['username'] = $session->username;

          $ret['logged_in'] = $session->user_logged_in;

          $ret['signature'] = RenderMan::render($row['signature']);

          $ret['user_level_list'] = Array();

          $ret['user_level_list']['guest'] = USER_LEVEL_GUEST;

          $ret['user_level_list']['member'] = USER_LEVEL_MEMBER;

          $ret['user_level_list']['mod'] = USER_LEVEL_MOD;

          $ret['user_level_list']['admin'] = USER_LEVEL_ADMIN;

          $ret['avatar_directory'] = getConfig('avatar_directory');

        }

        break;

      case 'approve':

        if ( !$this->perms->get_permissions('mod_comments') )

        {

          $ret = Array(

          'mode' => 'error', 

          'error' => 'You are not authorized to moderate comments.'

          );

          echo enano_json_encode($ret);

          return $ret;

        }

        $cid = (string)$data['id'];

        if ( !preg_match('#^([0-9]+)$#i', $cid) || intval($cid) < 1 )

        {

          echo '{"mode":"error","error":"HACKING ATTEMPT"}';

          return false;

        }

        $cid = intval($cid);

        $q = $db->sql_query('SELECT subject,approved FROM '.table_prefix.'comments WHERE comment_id='.$cid.';');

        if(!$q || $db->numrows() < 1)

          $db->die_json();

        $row = $db->fetchrow();

        $db->free_result();

        $appr = ( $row['approved'] == '1' ) ? '0' : '1';

        $q = $db->sql_query('UPDATE '.table_prefix."comments SET approved=$appr WHERE comment_id=$cid;");

        if (!$q)

          $db->die_json();

        $ret = Array(

            'mode' => 'redraw',

            'approved' => $appr,

            'subj' => $row['subject'],

            'id'   => $data['local_id'],

            'approve_updated' => 'yes'

          );

        break;

      case 'view_ip':

        if ( !$session->get_permissions('mod_comments') )

        {

          return array(

              'mode' => 'error',

              'error' => 'Unauthorized'

            );

        }

        // fetch comment info

        if ( !is_int($data['id']) )

        {

          return array(

              'mode' => 'error',

              'error' => 'Unauthorized'

            );

        }

        $id =& $data['id'];

        $q = $db->sql_query('SELECT ip_address, name FROM ' . table_prefix . 'comments WHERE comment_id = ' . $id . ';');

        if ( !$q || $db->numrows() < 1 )

        {

          $db->die_json();

        }

        list($ip_addr, $name) = $db->fetchrow_num($q);

        $db->free_result();

        $name = $db->escape($name);

        $username = $db->escape($session->username);

        // log this action

        $q = $db->sql_query('INSERT INTO ' . table_prefix . "logs(time_id, log_type, action, page_text, author, edit_summary) VALUES\n  "

                            . "( " . time() . ", 'security', 'view_comment_ip', '$name', '$username', '{$_SERVER['REMOTE_ADDR']}' );");

        if ( !$q )

          $db->die_json();

        // send packet

        $ret = array(

            'mode' => 'redraw',

            'ip_addr' => $ip_addr,

            'local_id' => $data['local_id']

          );

        break;

      default:

        $ret = Array(

          'mode' => 'error', 

          'error' => $data['mode'] . ' is not a valid request mode'

          );

        break;

    }

    echo enano_json_encode($ret);

    return $ret;

  }

} // class Comments