source: branches/2.1/include/functions_comment.inc.php @ 6605

Last change on this file since 6605 was 6605, checked in by nikrou, 14 years ago

Bug 1744 fixed : Incorrect use of timezone with SQLite
Fixed anti-flood system.

Merge from trunk

  • Property svn:eol-style set to LF
File size: 10.1 KB
Line 
1<?php
2// +-----------------------------------------------------------------------+
3// | Piwigo - a PHP based picture gallery                                  |
4// +-----------------------------------------------------------------------+
5// | Copyright(C) 2008-2010 Piwigo Team                  http://piwigo.org |
6// | Copyright(C) 2003-2008 PhpWebGallery Team    http://phpwebgallery.net |
7// | Copyright(C) 2002-2003 Pierrick LE GALL   http://le-gall.net/pierrick |
8// +-----------------------------------------------------------------------+
9// | This program is free software; you can redistribute it and/or modify  |
10// | it under the terms of the GNU General Public License as published by  |
11// | the Free Software Foundation                                          |
12// |                                                                       |
13// | This program is distributed in the hope that it will be useful, but   |
14// | WITHOUT ANY WARRANTY; without even the implied warranty of            |
15// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      |
16// | General Public License for more details.                              |
17// |                                                                       |
18// | You should have received a copy of the GNU General Public License     |
19// | along with this program; if not, write to the Free Software           |
20// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
21// | USA.                                                                  |
22// +-----------------------------------------------------------------------+
23
24//returns string action to perform on a new comment: validate, moderate, reject
25function user_comment_check($action, $comment)
26{
27  global $conf,$user;
28
29  if ($action=='reject')
30    return $action;
31
32  $my_action = $conf['comment_spam_reject'] ? 'reject':'moderate';
33
34  if ($action==$my_action)
35    return $action;
36
37  // we do here only BASIC spam check (plugins can do more)
38  if ( !is_a_guest() )
39    return $action;
40
41  $link_count = preg_match_all( '/https?:\/\//',
42    $comment['content'], $matches);
43
44  if ( strpos($comment['author'], 'http://')!==false )
45  {
46    $link_count++;
47  }
48
49  if ( $link_count>$conf['comment_spam_max_links'] )
50    return $my_action;
51
52  return $action;
53}
54
55
56add_event_handler('user_comment_check', 'user_comment_check',
57  EVENT_HANDLER_PRIORITY_NEUTRAL, 2);
58
59/**
60 * Tries to insert a user comment in the database and returns one of :
61 * validate, moderate, reject
62 * @param array comm contains author, content, image_id
63 * @param string key secret key sent back to the browser
64 * @param array infos out array of messages
65 */
66function insert_user_comment( &$comm, $key, &$infos )
67{
68  global $conf, $user;
69
70  $comm = array_merge( $comm,
71    array(
72      'ip' => $_SERVER['REMOTE_ADDR'],
73      'agent' => $_SERVER['HTTP_USER_AGENT']
74    )
75   );
76
77  $infos = array();
78  if (!$conf['comments_validation'] or is_admin())
79  {
80    $comment_action='validate'; //one of validate, moderate, reject
81  }
82  else
83  {
84    $comment_action='moderate'; //one of validate, moderate, reject
85  }
86
87  // display author field if the user status is guest or generic
88  if (!is_classic_user())
89  {
90    if ( empty($comm['author']) )
91    {
92      $comm['author'] = 'guest';
93    }
94    $comm['author_id'] = $conf['guest_id'];
95    // if a guest try to use the name of an already existing user, he must be
96    // rejected
97    if ( $comm['author'] != 'guest' )
98    {
99      $query = '
100SELECT COUNT(*) AS user_exists
101  FROM '.USERS_TABLE.'
102  WHERE '.$conf['user_fields']['username']." = '".addslashes($comm['author'])."'";
103      $row = pwg_db_fetch_assoc( pwg_query( $query ) );
104      if ( $row['user_exists'] == 1 )
105      {
106        array_push($infos, l10n('This login is already used by another user') );
107        $comment_action='reject';
108      }
109    }
110  }
111  else
112  {
113    $comm['author'] = addslashes($user['username']);
114    $comm['author_id'] = $user['id'];
115  }
116
117  if ( empty($comm['content']) )
118  { // empty comment content
119    $comment_action='reject';
120  }
121
122  $key = explode( ':', @$key );
123  if ( count($key)!=2
124        or $key[0]>time()-2 // page must have been retrieved more than 2 sec ago
125        or $key[0]<time()-3600 // 60 minutes expiration
126        or hash_hmac(
127              'md5', $key[0].':'.$comm['image_id'], $conf['secret_key']
128            ) != $key[1]
129      )
130  {
131    $comment_action='reject';
132  }
133
134  if ($comment_action!='reject' and $conf['anti-flood_time']>0 )
135  { // anti-flood system
136    $reference_date = pwg_db_get_flood_period_expression($conf['anti-flood_time']);
137
138    $query = '
139SELECT count(1) FROM '.COMMENTS_TABLE.'
140  WHERE date > '.$reference_date.'
141    AND author_id = '.$comm['author_id'];
142    list($counter) = pwg_db_fetch_row(pwg_query($query));
143    if ( $counter > 0 )
144    {
145      array_push( $infos, l10n('Anti-flood system : please wait for a moment before trying to post another comment') );
146      $comment_action='reject';
147    }
148  }
149
150  // perform more spam check
151  $comment_action = trigger_event('user_comment_check',
152      $comment_action, $comm
153    );
154
155  if ( $comment_action!='reject' )
156  {
157    $query = '
158INSERT INTO '.COMMENTS_TABLE.'
159  (author, author_id, content, date, validated, validation_date, image_id)
160  VALUES (
161    \''.$comm['author'].'\',
162    '.$comm['author_id'].',
163    \''.$comm['content'].'\',
164    NOW(),
165    \''.($comment_action=='validate' ? 'true':'false').'\',
166    '.($comment_action=='validate' ? 'NOW()':'NULL').',
167    '.$comm['image_id'].'
168  )
169';
170
171    pwg_query($query);
172
173    $comm['id'] = pwg_db_insert_id(COMMENTS_TABLE);
174
175    if ($conf['email_admin_on_comment']
176        or ($conf['email_admin_on_comment_validation'] and 'moderate' == $comment_action))
177    {
178      include_once(PHPWG_ROOT_PATH.'include/functions_mail.inc.php');
179
180      $comment_url = get_absolute_root_url().'comments.php?comment_id='.$comm['id'];
181
182      $keyargs_content = array
183      (
184        get_l10n_args('Author: %s', stripslashes($comm['author']) ),
185        get_l10n_args('Comment: %s', stripslashes($comm['content']) ),
186        get_l10n_args('', ''),
187        get_l10n_args('Manage this user comment: %s', $comment_url)
188      );
189
190      if ('moderate' == $comment_action)
191      {
192        $keyargs_content[] = get_l10n_args('', '');
193        $keyargs_content[] = get_l10n_args('(!) This comment requires validation', '');
194      }
195
196      pwg_mail_notification_admins
197      (
198        get_l10n_args('Comment by %s', stripslashes($comm['author']) ),
199        $keyargs_content
200      );
201    }
202  }
203  return $comment_action;
204}
205
206/**
207 * Tries to delete a user comment in the database
208 * only admin can delete all comments
209 * other users can delete their own comments
210 * so to avoid a new sql request we add author in where clause
211 *
212 * @param comment_id
213 */
214function delete_user_comment($comment_id) {
215  $user_where_clause = '';
216  if (!is_admin())
217  {
218    $user_where_clause = '   AND author_id = \''.$GLOBALS['user']['id'].'\'';
219  }
220  $query = '
221DELETE FROM '.COMMENTS_TABLE.'
222  WHERE id = '.$comment_id.
223$user_where_clause.'
224;';
225  $result = pwg_query($query);
226  if ($result) {
227    email_admin('delete', 
228                array('author' => $GLOBALS['user']['username'],
229                      'comment_id' => $comment_id
230                  ));
231  }
232}
233
234/**
235 * Tries to update a user comment in the database
236 * only admin can update all comments
237 * users can edit their own comments if admin allow them
238 * so to avoid a new sql request we add author in where clause
239 *
240 * @param comment_id
241 * @param post_key
242 * @param content
243 */
244
245function update_user_comment($comment, $post_key)
246{
247  global $conf;
248
249  $comment_action = 'validate';
250
251  $key = explode( ':', $post_key );
252  if ( count($key)!=2
253       or $key[0]>time()-2 // page must have been retrieved more than 2 sec ago
254       or $key[0]<time()-3600 // 60 minutes expiration
255       or hash_hmac('md5', $key[0].':'.$comment['image_id'], $conf['secret_key']
256                    ) != $key[1]
257       )
258  {
259    $comment_action='reject';
260  }
261
262  // perform more spam check
263  $comment_action =
264    trigger_event('user_comment_check',
265                  $comment_action,
266                  array_merge($comment,
267                              array('author' => $GLOBALS['user']['username'])
268                              )
269                  );
270
271  if ( $comment_action!='reject' )
272  {
273    $user_where_clause = '';
274    if (!is_admin())
275    {
276      $user_where_clause = '   AND author_id = \''.
277        $GLOBALS['user']['id'].'\'';
278    }
279    $query = '
280UPDATE '.COMMENTS_TABLE.'
281  SET content = \''.$comment['content'].'\',
282      validation_date = now()
283  WHERE id = '.$comment['comment_id'].
284$user_where_clause.'
285;';
286    $result = pwg_query($query);
287    if ($result) {
288      email_admin('edit', array('author' => $GLOBALS['user']['username'],
289                                'content' => stripslashes($comment['content'])) );
290    }
291  }
292}
293
294function email_admin($action, $comment)
295{
296  global $conf;
297
298  if (!in_array($action, array('edit', 'delete'))
299      or (($action=='edit') and !$conf['email_admin_on_comment_edition'])
300      or (($action=='delete') and !$conf['email_admin_on_comment_deletion']))
301  {
302    return;
303  }
304
305  include_once(PHPWG_ROOT_PATH.'include/functions_mail.inc.php');
306
307  $keyargs_content = array();
308  $keyargs_content[] = get_l10n_args('Author: %s', $comment['author']);
309  if ($action=='delete')
310  {
311    $keyargs_content[] = get_l10n_args('This author removed the comment with id %d',
312                                       $comment['comment_id']
313                                       );
314  }
315  else
316  {
317    $keyargs_content[] = get_l10n_args('This author modified following comment:', '');
318    $keyargs_content[] = get_l10n_args('Comment: %s', $comment['content']);
319  }
320
321  pwg_mail_notification_admins(get_l10n_args('Comment by %s',
322                                             $comment['author']),
323                               $keyargs_content
324                               );
325}
326
327function get_comment_author_id($comment_id, $die_on_error=true)
328{
329  $query = '
330SELECT
331    author_id
332  FROM '.COMMENTS_TABLE.'
333  WHERE id = '.$comment_id.'
334;';
335  $result = pwg_query($query);
336  if (pwg_db_num_rows($result) == 0)
337  {
338    if ($die_on_error)
339    {
340      fatal_error('Unknown comment identifier');
341    }
342    else
343    {
344      return false;
345    }
346  }
347 
348  list($author_id) = pwg_db_fetch_row($result);
349
350  return $author_id;
351}
352
353function validate_user_comment($comment_id)
354{
355  $query = '
356UPDATE '.COMMENTS_TABLE.'
357  SET validated = \'true\'
358    , validation_date = NOW()
359  WHERE id = '.$comment_id.'
360;';
361  pwg_query($query);
362}
363?>
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