function WikiGalleryThumbnail($pagename, $auth = "read")
{
global $WikiGallery_UseAuthorization, $WikiGalleryThumbProviders, $WikiGallery_DefaultGroup;
// get filename
if (!isset($_GET["image"])) {
Abort('no image given');
}
if (!isset($_GET["group"])) {
$group = $WikiGallery_DefaultGroup;
} else {
$group = $_GET["group"];
}
$path = WikiGallerySecurePath(urldecode($_GET["image"]));
// group exists?
if (!isset($WikiGalleryThumbProviders[$group])) {
Abort("Invalid gallery group \"{$group}\" given");
}
$provider =& $WikiGalleryThumbProviders[$group];
// get size
$width = intval(@$_GET["width"]);
$height = intval(@$_GET["height"]);
if ($width < 0 || $width > 1600) {
$width = 0;
}
if ($height < 0 || $height > 1200) {
$height = 0;
}
$resizeMode = urldecode(@$_GET["mode"]);
// check authorization
$pagename = fileNameToPageName($path);
if ($WikiGallery_UseAuthorization) {
$page = RetrieveAuthPage($pagename, $auth, true, READPAGE_CURRENT);
if (!$page) {
Abort('?cannot read $pagename');
}
PCache($pagename, $page);
}
// get image
$provider->thumb($path, $width, $height, $resizeMode);
exit;
}
function picture($width, $height, $resizeMode, $path, $random = false)
{
$path = WikiGallerySecurePath($path);
// random picture?
if ($random) {
// get pictures
$pictures = $this->provider->getFilenames("/" . $path);
if (!$pictures) {
// no pictures found. Try albums instead
$albums = $this->provider->getFilenames("/" . $path, true);
if (!albums) {
return false;
}
$path .= "/" . $albums[rand(0, count($albums) - 1)];
return $this->picture($width, $height, $resizeMode, $path, true);
}
// choose random picture
$num = rand(0, count($pictures) - 1);
$path .= "/" . $pictures[$num];
}
// return thumb url
return $this->provider->thumb($path, $width, $height, $resizeMode);
}