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<?php
/***************************************************************************
* functions.php *
* ------------------- *
* application : PhpWebGallery 1.3 *
* author : Pierrick LE GALL <pierrick@z0rglub.com> *
* *
***************************************************************************
***************************************************************************
* *
* 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; *
* *
***************************************************************************/
$tab_ext_create_TN = array ( 'jpg', 'png', 'JPG', 'PNG' );
// is_image returns true if the given $filename (including the path) is a
// picture according to its format and its extension.
// As GD library can only generate pictures from jpeg and png files, if you
// ask if the filename is an image for thumbnail creation (second parameter
// set to true), the only authorized formats are jpeg and png.
function is_image( $filename, $create_thumbnail = false )
{
global $conf, $tab_ext_create_TN;
if ( is_file( $filename ) )
{
$size = getimagesize( $filename );
// $size[2] == 1 means GIF
// $size[2] == 2 means JPG
// $size[2] == 3 means PNG
if ( !$create_thumbnail )
{
if ( in_array( get_extension( $filename ), $conf['picture_ext'] )
and ( $size[2] == 1 or $size[2] == 2 or $size[2] == 3 ) )
{
return true;
}
}
else
{
if ( in_array( get_extension( $filename ), $tab_ext_create_TN )
and ( $size[2] == 2 or $size[2] == 3 ) )
{
return true;
}
}
}
return false;
}
function TN_exists( $dir, $file )
{
global $conf;
$filename = get_filename_wo_extension( $file );
foreach ( $conf['picture_ext'] as $ext ) {
$test = $dir.'/thumbnail/'.$conf['prefix_thumbnail'].$filename.'.'.$ext;
if ( is_file ( $test ) )
{
return $ext;
}
}
return false;
}
// The function delete_site deletes a site
// and call the function delete_category for each primary category of the site
function delete_site( $id )
{
// destruction of the categories of the site
$query = 'SELECT id';
$query.= ' FROM '.PREFIX_TABLE.'categories';
$query.= ' WHERE site_id = '.$id;
$query.= ';';
$result = mysql_query( $query );
while ( $row = mysql_fetch_array( $result ) )
{
delete_category( $row['id'] );
}
// destruction of the site
$query = 'DELETE FROM '.PREFIX_TABLE.'sites';
$query.= ' WHERE id = '.$id;
$query.= ';';
mysql_query( $query );
}
// The function delete_category deletes the category identified by the $id
// It also deletes (in the database) :
// - all the images of the images (thanks to delete_image, see further)
// - all the restrictions linked to the category
// The function works recursively.
function delete_category( $id )
{
// destruction of all the related images
$query = 'SELECT id';
$query.= ' FROM '.PREFIX_TABLE.'images';
$query.= ' WHERE cat_id = '.$id;
$query.= ';';
$result = mysql_query( $query );
while ( $row = mysql_fetch_array( $result ) )
{
delete_image( $row['id'] );
}
// destruction of the access linked to the category
$query = 'DELETE FROM '.PREFIX_TABLE.'user_access';
$query.= ' WHERE cat_id = '.$id;
$query.= ';';
mysql_query( $query );
$query = 'DELETE FROM '.PREFIX_TABLE.'group_access';
$query.= ' WHERE cat_id = '.$id;
$query.= ';';
mysql_query( $query );
// destruction of the sub-categories
$query = 'SELECT id';
$query.= ' FROM '.PREFIX_TABLE.'categories';
$query.= ' WHERE id_uppercat = '.$id;
$query.= ';';
$result = mysql_query( $query );
while( $row = mysql_fetch_array( $result ) )
{
delete_category( $row['id'] );
}
// destruction of the category
$query = 'DELETE FROM '.PREFIX_TABLE.'categories';
$query.= ' WHERE id = '.$id;
$query.= ';';
mysql_query( $query );
}
// The function delete_image deletes the image identified by the $id
// It also deletes (in the database) :
// - all the comments related to the image
// - all the favorites associated to the image
function delete_image( $id )
{
global $count_deleted;
// destruction of the comments on the image
$query = 'DELETE FROM '.PREFIX_TABLE.'comments';
$query.= ' WHERE image_id = '.$id;
$query.= ';';
mysql_query( $query );
// destruction of the favorites associated with the picture
$query = 'DELETE FROM '.PREFIX_TABLE.'favorites';
$query.= ' WHERE image_id = '.$id;
$query.= ';';
mysql_query( $query );
// destruction of the image
$query = 'DELETE FROM '.PREFIX_TABLE.'images';
$query.= ' WHERE id = '.$id;
$query.= ';';
mysql_query( $query );
$count_deleted++;
}
// The delete_user function delete a user identified by the $user_id
// It also deletes :
// - all the access linked to this user
// - all the links to any group
// - all the favorites linked to this user
// - all sessions linked to this user
function delete_user( $user_id )
{
// destruction of the access linked to the user
$query = 'DELETE FROM '.PREFIX_TABLE.'user_access';
$query.= ' WHERE user_id = '.$user_id;
$query.= ';';
mysql_query( $query );
// destruction of the group links for this user
$query = 'DELETE FROM '.PREFIX_TABLE.'user_group';
$query.= ' WHERE user_id = '.$user_id;
$query.= ';';
mysql_query( $query );
// destruction of the favorites associated with the user
$query = 'DELETE FROM '.PREFIX_TABLE.'favorites';
$query.= ' WHERE user_id = '.$user_id;
$query.= ';';
mysql_query( $query );
// destruction of the sessions linked with the user
$query = 'DELETE FROM '.PREFIX_TABLE.'sessions';
$query.= ' WHERE user_id = '.$user_id;
$query.= ';';
mysql_query( $query );
// destruction of the user
$query = 'DELETE FROM '.PREFIX_TABLE.'users';
$query.= ' WHERE id = '.$user_id;
$query.= ';';
mysql_query( $query );
}
// delete_group deletes a group identified by its $group_id.
// It also deletes :
// - all the access linked to this group
// - all the links between this group and any user
function delete_group( $group_id )
{
// destruction of the access linked to the group
$query = 'DELETE FROM '.PREFIX_TABLE.'group_access';
$query.= ' WHERE group_id = '.$group_id;
$query.= ';';
mysql_query( $query );
// destruction of the group links for this group
$query = 'DELETE FROM '.PREFIX_TABLE.'user_group';
$query.= ' WHERE group_id = '.$group_id;
$query.= ';';
mysql_query( $query );
// destruction of the group
$query = 'DELETE FROM '.PREFIX_TABLE.'groups';
$query.= ' WHERE id = '.$group_id;
$query.= ';';
mysql_query( $query );
}
// The check_favorites function deletes all the favorites of a user if he is
// not allowed to see them (the category or an upper category is restricted
// or invisible)
function check_favorites( $user_id )
{
$query = 'SELECT status';
$query.= ' FROM '.PREFIX_TABLE.'users';
$query.= ' WHERE id = '.$user_id;
$query.= ';';
$row = mysql_fetch_array( mysql_query( $query ) );
$status = $row['status'];
// retrieving all the restricted categories for this user
$restricted_cat = get_all_restrictions( $user_id, $status );
// retrieving all the favorites for this user and comparing their
// categories to the restricted categories
$query = 'SELECT image_id, cat_id';
$query.= ' FROM '.PREFIX_TABLE.'favorites, '.PREFIX_TABLE.'images';
$query.= ' WHERE user_id = '.$user_id;
$query.= ' AND id = image_id';
$query.= ';';
$result = mysql_query ( $query );
while ( $row = mysql_fetch_array( $result ) )
{
if ( in_array( $row['cat_id'], $restricted_cat ) )
{
$query = 'DELETE FROM '.PREFIX_TABLE.'favorites';
$query.= ' WHERE image_id = '.$row['image_id'];
$query.= ' AND user_id = '.$user_id;
$query.= ';';
mysql_query( $query );
}
}
}
?>
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