aboutsummaryrefslogtreecommitdiffstats
path: root/include/functions_comment.inc.php
blob: 9db0a4c176a44f6d4027e9928238d3ac47bc5e4c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
<?php
// +-----------------------------------------------------------------------+
// | PhpWebGallery - a PHP based picture gallery                           |
// | Copyright (C) 2002-2003 Pierrick LE GALL - pierrick@phpwebgallery.net |
// | Copyright (C) 2003-2007 PhpWebGallery Team - http://phpwebgallery.net |
// +-----------------------------------------------------------------------+
// | file          : $Id$
// | last update   : $Date$
// | last modifier : $Author$
// | revision      : $Revision$
// +-----------------------------------------------------------------------+
// | 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                                          |
// |                                                                       |
// | 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.                                                                  |
// +-----------------------------------------------------------------------+

/**
 * returns a "secret key" that is to be sent back when a user enters a comment
 */
function get_comment_post_key($image_id)
{
  global $conf;
  $time = time();
  return $time.':'.hash_hmac('md5', $time.':'.$image_id, $conf['secret_key'] );
}

//returns string action to perform on a new comment: validate, moderate, reject
function user_comment_check($action, $comment)
{
  global $conf,$user;

  if ($action=='reject')
    return $action;

  $my_action = $conf['comment_spam_reject'] ? 'reject':'moderate';

  if ($action==$my_action)
    return $action;

  // we do here only BASIC spam check (plugins can do more)
  if ( !$user['is_the_guest'] )
    return $action;

  $link_count = preg_match_all( '/https?:\/\//',
    $comment['content'], $matches);

  if ( strpos($comment['author'], 'http://')!==false )
  {
    $link_count++;
  }
  
  if ( $link_count>$conf['comment_spam_max_links'] )
    return $my_action;

  if ( isset($comment['ip']) and $conf['comment_spam_check_ip'] 
      and $_SERVER["SERVER_ADDR"] != $comment['ip']  
    )
  {
    $rev_ip = implode( '.', array_reverse( explode('.',$comment['ip']) ) );
    $lookup = $rev_ip . '.sbl-xbl.spamhaus.org.';
    $res = gethostbyname( $lookup );
    if ( $lookup != $res )
      return $my_action;
  }

  return $action;
}


add_event_handler('user_comment_check', 'user_comment_check',
  EVENT_HANDLER_PRIORITY_NEUTRAL, 2);

/**
 * Tries to insert a user comment in the database and returns one of :
 * validate, moderate, reject
 * @param array comm contains author, content, image_id
 * @param string key secret key sent back to the browser
 * @param array infos out array of messages
 */
function insert_user_comment( &$comm, $key, &$infos )
{
  global $conf, $user;
  
  $comm = array_merge( $comm, 
    array(
      'ip' => $_SERVER['REMOTE_ADDR'],
      'agent' => $_SERVER['HTTP_USER_AGENT']
    )
   );

  $infos = array();
  if (!$conf['comments_validation'] or is_admin())
  {
    $comment_action='validate'; //one of validate, moderate, reject
  }
  else
  {
    $comment_action='moderate'; //one of validate, moderate, reject
  }

  if ( $user['is_the_guest'] )
  {
    if ( empty($comm['author']) )
    {
      $comm['author'] = 'guest';
    }
    // if a guest try to use the name of an already existing user, he must be
    // rejected
    if ( $comm['author'] != 'guest' )
    {
      $query = '
SELECT COUNT(*) AS user_exists
  FROM '.USERS_TABLE.'
  WHERE '.$conf['user_fields']['username']." = '".addslashes($comm['author'])."'";
      $row = mysql_fetch_assoc( pwg_query( $query ) );
      if ( $row['user_exists'] == 1 )
      {
        array_push($infos, l10n('comment_user_exists') );
        $comment_action='reject';
      }
    }
  }
  else
  {
    $comm['author'] = $user['username'];
  }
  if ( empty($comm['content']) )
  { // empty comment content
    $comment_action='reject';
  }

  $key = explode( ':', @$key );
  if ( count($key)!=2
        or $key[0]>time()-2 // page must have been retrieved more than 2 sec ago
        or $key[0]<time()-3600 // 60 minutes expiration
        or hash_hmac(
              'md5', $key[0].':'.$comm['image_id'], $conf['secret_key']
            ) != $key[1]
      )
  {
    $comment_action='reject';
  }
  
  if ($comment_action!='reject' and $conf['anti-flood_time']>0 )
  { // anti-flood system
    $reference_date = time() - $conf['anti-flood_time'];
    $query = '
SELECT id FROM '.COMMENTS_TABLE.'
  WHERE date > FROM_UNIXTIME('.$reference_date.')
    AND author = "'.addslashes($comm['author']).'"';
    if ( mysql_num_rows( pwg_query( $query ) ) > 0 )
    {
      array_push( $infos, l10n('comment_anti-flood') );
      $comment_action='reject';
    }
  }

  // perform more spam check
  $comment_action = trigger_event('user_comment_check',
      $comment_action, $comm
    );

  if ( $comment_action!='reject' )
  {
    $query = '
INSERT INTO '.COMMENTS_TABLE.'
  (author, content, date, validated, validation_date, image_id)
  VALUES (
    "'.addslashes($comm['author']).'",
    "'.addslashes($comm['content']).'",
    NOW(),
    "'.($comment_action=='validate' ? 'true':'false').'",
    '.($comment_action=='validate' ? 'NOW()':'NULL').',
    '.$comm['image_id'].'      
  )
';

    pwg_query($query);

    $comm['id'] = mysql_insert_id();

    if ( ($comment_action=='validate' and $conf['email_admin_on_comment'])
      or $conf['email_admin_on_comment_validation'] )
    {
      include_once(PHPWG_ROOT_PATH.'include/functions_mail.inc.php');

      $del_url =
          get_absolute_root_url().'comments.php?delete='.$comm['id'];

      $content =
         'Author: '.$comm['author']."\n"
        .'Comment: '.$comm['content']."\n"
        .get_block_mail_admin_info()
        .'Delete: '.$del_url."\n";

      if ($comment_action!='validate')
      {
        $content .=
          'Validate: '
          .get_absolute_root_url().'comments.php?validate='.$comm['id'];
      }

      pwg_mail
      (
        format_email('administrators', get_webmaster_mail_address()),
        array
        (
          'subject' => 'PWG comment by '.$comm['author'], 
          'content' => $content,
          'Bcc' => get_administrators_email()
        )
      );
    }
  }
  return $comment_action;
}

?>