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<?php
// +-----------------------------------------------------------------------+
// | Piwigo - a PHP based picture gallery |
// +-----------------------------------------------------------------------+
// | Copyright(C) 2008-2010 Piwigo Team http://piwigo.org |
// | Copyright(C) 2003-2008 PhpWebGallery Team http://phpwebgallery.net |
// | Copyright(C) 2002-2003 Pierrick LE GALL http://le-gall.net/pierrick |
// +-----------------------------------------------------------------------+
// | 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 category id that corresponds to the given permalink (or null)
* @param string permalink
*/
function get_cat_id_from_permalink( $permalink )
{
$query ='
SELECT id FROM '.CATEGORIES_TABLE.'
WHERE permalink=\''.$permalink.'\'';
$ids = array_from_query($query, 'id');
if (!empty($ids))
{
return $ids[0];
}
return null;
}
/** returns a category id that has used before this permalink (or null)
* @param string permalink
* @param boolean is_hit if true update the usage counters on the old permalinks
*/
function get_cat_id_from_old_permalink($permalink)
{
$query='
SELECT c.id
FROM '.OLD_PERMALINKS_TABLE.' op INNER JOIN '.CATEGORIES_TABLE.' c
ON op.cat_id=c.id
WHERE op.permalink="'.$permalink.'"
LIMIT 1';
$result = pwg_query($query);
$cat_id = null;
if ( pwg_db_num_rows($result) )
list( $cat_id ) = pwg_db_fetch_row($result);
return $cat_id;
}
/** deletes the permalink associated with a category
* returns true on success
* @param int cat_id the target category id
* @param boolean save if true, the current category-permalink association
* is saved in the old permalinks table in case external links hit it
*/
function delete_cat_permalink( $cat_id, $save )
{
global $page, $cache;
$query = '
SELECT permalink
FROM '.CATEGORIES_TABLE.'
WHERE id=\''.$cat_id.'\'
;';
$result = pwg_query($query);
if ( pwg_db_num_rows($result) )
{
list($permalink) = pwg_db_fetch_row($result);
}
if ( !isset($permalink) )
{// no permalink; nothing to do
return true;
}
if ($save)
{
$old_cat_id = get_cat_id_from_old_permalink($permalink);
if ( isset($old_cat_id) and $old_cat_id!=$cat_id )
{
$page['errors'][] =
sprintf(
l10n('Permalink %s has been previously used by category %s. Delete from the permalink history first'),
$permalink, $old_cat_id
);
return false;
}
}
$query = '
UPDATE '.CATEGORIES_TABLE.'
SET permalink=NULL
WHERE id='.$cat_id.'
LIMIT 1';
pwg_query($query);
unset( $cache['cat_names'] ); //force regeneration
if ($save)
{
if ( isset($old_cat_id) )
{
$query = '
UPDATE '.OLD_PERMALINKS_TABLE.'
SET date_deleted=NOW()
WHERE cat_id='.$cat_id.' AND permalink=\''.$permalink.'\'';
}
else
{
$query = '
INSERT INTO '.OLD_PERMALINKS_TABLE.'
(permalink, cat_id, date_deleted)
VALUES
( \''.$permalink.'\','.$cat_id.',NOW() )';
}
pwg_query( $query );
}
return true;
}
/** sets a new permalink for a category
* returns true on success
* @param int cat_id the target category id
* @param string permalink the new permalink
* @param boolean save if true, the current category-permalink association
* is saved in the old permalinks table in case external links hit it
*/
function set_cat_permalink( $cat_id, $permalink, $save )
{
global $page, $cache;
$sanitized_permalink = preg_replace( '#[^a-zA-Z0-9_/-]#', '' ,$permalink);
$sanitized_permalink = trim($sanitized_permalink, '/');
$sanitized_permalink = str_replace('//', '/', $sanitized_permalink);
if ( $sanitized_permalink != $permalink
or preg_match( '#^(\d)+(-.*)?$#', $permalink) )
{
$page['errors'][] = l10n('The permalink name must be composed of a-z, A-Z, 0-9, "-", "_" or "/". It must not be numeric or start with number followed by "-"');
return false;
}
// check if the new permalink is actively used
$existing_cat_id = get_cat_id_from_permalink( $permalink );
if ( isset($existing_cat_id) )
{
if ( $existing_cat_id==$cat_id )
{// no change required
return true;
}
else
{
$page['errors'][] =
sprintf(
l10n('Permalink %s is already used by category %s'),
$permalink, $existing_cat_id
);
return false;
}
}
// check if the new permalink was historically used
$old_cat_id = get_cat_id_from_old_permalink($permalink);
if ( isset($old_cat_id) and $old_cat_id!=$cat_id )
{
$page['errors'][] =
sprintf(
l10n('Permalink %s has been previously used by category %s. Delete from the permalink history first'),
$permalink, $old_cat_id
);
return false;
}
if ( !delete_cat_permalink($cat_id, $save ) )
{
return false;
}
if ( isset($old_cat_id) )
{// the new permalink must not be active and old at the same time
assert( $old_cat_id==$cat_id );
$query = '
DELETE FROM '.OLD_PERMALINKS_TABLE.'
WHERE cat_id='.$old_cat_id.' AND permalink=\''.$permalink.'\'';
pwg_query($query);
}
$query = '
UPDATE '.CATEGORIES_TABLE.'
SET permalink=\''.$permalink.'\'
WHERE id='.$cat_id;
// LIMIT 1';
pwg_query($query);
unset( $cache['cat_names'] ); //force regeneration
return true;
}
?>
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