source: trunk/include/functions_comment.inc.php @ 5698

Last change on this file since 5698 was 5196, checked in by plg, 15 years ago

increase copyright year to 2010

File size: 10.5 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 = time() - $conf['anti-flood_time'];
137    $query = '
138SELECT id FROM '.COMMENTS_TABLE.'
139  WHERE date > FROM_UNIXTIME('.$reference_date.')
140    AND author_id = '.$comm['author_id'];
141    if ( pwg_db_num_rows( pwg_query( $query ) ) > 0 )
142    {
143      array_push( $infos, l10n('Anti-flood system : please wait for a moment before trying to post another comment') );
144      $comment_action='reject';
145    }
146  }
147
148  // perform more spam check
149  $comment_action = trigger_event('user_comment_check',
150      $comment_action, $comm
151    );
152
153  if ( $comment_action!='reject' )
154  {
155    $query = '
156INSERT INTO '.COMMENTS_TABLE.'
157  (author, author_id, content, date, validated, validation_date, image_id)
158  VALUES (
159    "'.$comm['author'].'",
160    '.$comm['author_id'].',
161    "'.$comm['content'].'",
162    NOW(),
163    "'.($comment_action=='validate' ? 'true':'false').'",
164    '.($comment_action=='validate' ? 'NOW()':'NULL').',
165    '.$comm['image_id'].'
166  )
167';
168
169    pwg_query($query);
170
171    $comm['id'] = pwg_db_insert_id(COMMENTS_TABLE);
172
173    if ($conf['email_admin_on_comment']
174        or ($conf['email_admin_on_comment_validation'] and 'moderate' == $comment_action))
175    {
176      include_once(PHPWG_ROOT_PATH.'include/functions_mail.inc.php');
177
178      $comment_url = get_absolute_root_url().'comments.php?comment_id='.$comm['id'];
179
180      $keyargs_content = array
181      (
182        get_l10n_args('Author: %s', stripslashes($comm['author']) ),
183        get_l10n_args('Comment: %s', stripslashes($comm['content']) ),
184        get_l10n_args('', ''),
185        get_l10n_args('Manage this user comment: %s', $comment_url)
186      );
187
188      if ('moderate' == $comment_action)
189      {
190        $keyargs_content[] = get_l10n_args('', '');
191        $keyargs_content[] = get_l10n_args('(!) This comment requires validation', '');
192      }
193
194      pwg_mail_notification_admins
195      (
196        get_l10n_args('Comment by %s', stripslashes($comm['author']) ),
197        $keyargs_content
198      );
199    }
200  }
201  return $comment_action;
202}
203
204/**
205 * Tries to delete a user comment in the database
206 * only admin can delete all comments
207 * other users can delete their own comments
208 * so to avoid a new sql request we add author in where clause
209 *
210 * @param comment_id
211 */
212function delete_user_comment($comment_id) {
213  $user_where_clause = '';
214  if (!is_admin())
215  {
216    $user_where_clause = '   AND author_id = \''.$GLOBALS['user']['id'].'\'';
217  }
218  $query = '
219DELETE FROM '.COMMENTS_TABLE.'
220  WHERE id = '.$comment_id.
221$user_where_clause.'
222;';
223  $result = pwg_query($query);
224  if ($result) {
225    email_admin('delete', array('author' => $GLOBALS['user']['username']));
226  }
227}
228
229/**
230 * Tries to update a user comment in the database
231 * only admin can update all comments
232 * users can edit their own comments if admin allow them
233 * so to avoid a new sql request we add author in where clause
234 *
235 * @param comment_id
236 * @param post_key
237 * @param content
238 */
239
240function update_user_comment($comment, $post_key)
241{
242  global $conf;
243
244  $comment_action = 'validate';
245
246  $key = explode( ':', $post_key );
247  if ( count($key)!=2
248       or $key[0]>time()-2 // page must have been retrieved more than 2 sec ago
249       or $key[0]<time()-3600 // 60 minutes expiration
250       or hash_hmac('md5', $key[0].':'.$comment['image_id'], $conf['secret_key']
251                    ) != $key[1]
252       )
253  {
254    $comment_action='reject';
255  }
256
257/* ? this is a MySql Error - author_id is not defined
258  if ($comment_action!='reject' and $conf['anti-flood_time']>0 )
259  { // anti-flood system
260    $reference_date = time() - $conf['anti-flood_time'];
261    $query = '
262SELECT id FROM '.COMMENTS_TABLE.'
263  WHERE date > FROM_UNIXTIME('.$reference_date.')
264    AND author_id = '.$comm['author_id'];
265    if ( pwg_db_num_rows( pwg_query( $query ) ) > 0 )
266    {
267      //?? array_push( $infos, l10n('Anti-flood system : please wait for a moment before trying to post another comment') );
268      $comment_action='reject';
269    }
270  }
271*/
272  // perform more spam check
273  $comment_action =
274    trigger_event('user_comment_check',
275                  $comment_action,
276                  array_merge($comment,
277                              array('author' => $GLOBALS['user']['username'])
278                              )
279                  );
280
281  if ( $comment_action!='reject' )
282  {
283    $user_where_clause = '';
284    if (!is_admin())
285    {
286      $user_where_clause = '   AND author_id = \''.
287        $GLOBALS['user']['id'].'\'';
288    }
289    $query = '
290UPDATE '.COMMENTS_TABLE.'
291  SET content = \''.$comment['content'].'\',
292      validation_date = now()
293  WHERE id = '.$comment['comment_id'].
294$user_where_clause.'
295;';
296    $result = pwg_query($query);
297    if ($result) {
298      email_admin('edit', array('author' => $GLOBALS['user']['username'],
299                                'content' => stripslashes($comment['content'])) );
300    }
301  }
302}
303
304function email_admin($action, $comment)
305{
306  global $conf;
307
308  if (!in_array($action, array('edit', 'delete'))
309      or (($action=='edit') and !$conf['email_admin_on_comment_edition'])
310      or (($action=='delete') and !$conf['email_admin_on_comment_deletion']))
311  {
312    return;
313  }
314
315  include_once(PHPWG_ROOT_PATH.'include/functions_mail.inc.php');
316
317  $keyargs_content = array();
318  $keyargs_content[] = get_l10n_args('Author: %s', $comment['author']);
319  if ($action=='delete')
320  {
321    $keyargs_content[] = get_l10n_args('This author removed the comment with id %d',
322                                       $comment['comment_id']
323                                       );
324  }
325  else
326  {
327    $keyargs_content[] = get_l10n_args('This author modified following comment:', '');
328    $keyargs_content[] = get_l10n_args('Comment: %s', $comment['content']);
329  }
330
331  pwg_mail_notification_admins(get_l10n_args('Comment by %s',
332                                             $comment['author']),
333                               $keyargs_content
334                               );
335}
336
337function get_comment_author_id($comment_id, $die_on_error=true)
338{
339  $query = '
340SELECT
341    author_id
342  FROM '.COMMENTS_TABLE.'
343  WHERE id = '.$comment_id.'
344;';
345  $result = pwg_query($query);
346  if (pwg_db_num_rows($result) == 0)
347  {
348    if ($die_on_error)
349    {
350      fatal_error('Unknown comment identifier');
351    }
352    else
353    {
354      return false;
355    }
356  }
357 
358  list($author_id) = pwg_db_fetch_row($result);
359
360  return $author_id;
361}
362
363function validate_user_comment($comment_id)
364{
365  $query = '
366UPDATE '.COMMENTS_TABLE.'
367  SET validated = "true"
368    , validation_date = NOW()
369  WHERE id = '.$comment_id.'
370;';
371  pwg_query($query);
372}
373?>
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