/**
* Unzip an uploaded zip file
*
* @param array $file the $_FILES information
* @param int $container_guid the container to put the files/folders under
* @param int $parent_guid the parrent folder
*
* @return bool
*/
function file_tools_unzip($file, $container_guid, $parent_guid = 0)
{
$container_guid = (int) $container_guid;
$parent_guid = (int) $parent_guid;
if (empty($file) || empty($container_guid)) {
return false;
}
$container_entity = get_entity($container_guid);
if (empty($container_entity)) {
return false;
}
$extracted = false;
$allowed_extensions = file_tools_allowed_extensions();
$zipfile = elgg_extract('tmp_name', $file);
$access_id = get_input('access_id', false);
if ($access_id === false) {
$parent_folder = get_entity($parent_guid);
if (elgg_instanceof($parent_folder, 'object', FILE_TOOLS_SUBTYPE)) {
$access_id = $parent_folder->access_id;
} else {
if ($container_entity instanceof ElggGroup) {
$access_id = $container_entity->group_acl;
} else {
$access_id = get_default_access($container_entity);
}
}
}
// open the zip file
$zip = zip_open($zipfile);
while ($zip_entry = zip_read($zip)) {
// open the zip entry
zip_entry_open($zip, $zip_entry);
// set some variables
$zip_entry_name = zip_entry_name($zip_entry);
$filename = basename($zip_entry_name);
// check for folder structure
if (strlen($zip_entry_name) != strlen($filename)) {
// there is a folder structure, check it and create missing items
file_tools_create_folders($zip_entry, $container_guid, $parent_guid);
}
// extract the folder structure from the zip entry
$folder_array = explode('/', $zip_entry_name);
$parent = $parent_guid;
foreach ($folder_array as $folder) {
$folder = utf8_encode($folder);
$entity = file_tools_check_foldertitle_exists($folder, $container_guid, $parent);
if (!empty($entity)) {
$parent = $entity->getGUID();
} else {
if ($folder !== end($folder_array)) {
continue;
}
$prefix = 'file/';
$extension_array = explode('.', $folder);
$file_extension = end($extension_array);
if (!in_array(strtolower($file_extension), $allowed_extensions)) {
continue;
}
$buf = zip_entry_read($zip_entry, zip_entry_filesize($zip_entry));
$filestorename = elgg_strtolower(time() . $folder);
// create the file
$filehandler = new ElggFile();
$filehandler->setFilename($prefix . $filestorename);
$filehandler->title = $folder;
$filehandler->originalfilename = $folder;
$filehandler->owner_guid = elgg_get_logged_in_user_guid();
$filehandler->container_guid = $container_guid;
$filehandler->access_id = $access_id;
if (!$filehandler->save()) {
continue;
}
$filehandler->open('write');
$filehandler->write($buf);
$filehandler->close();
$mime_type = $filehandler->detectMimeType($filehandler->getFilenameOnFilestore());
// hack for Microsoft zipped formats
$info = pathinfo($folder);
$office_formats = ['docx', 'xlsx', 'pptx'];
if ($mime_type == 'application/zip' && in_array($info['extension'], $office_formats)) {
switch ($info['extension']) {
case 'docx':
$mime_type = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
break;
case 'xlsx':
$mime_type = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
break;
case 'pptx':
$mime_type = 'application/vnd.openxmlformats-officedocument.presentationml.presentation';
break;
}
}
// check for bad ppt detection
if ($mime_type == 'application/vnd.ms-office' && $info['extension'] == 'ppt') {
$mime_type = 'application/vnd.ms-powerpoint';
}
$simple_type = file_get_simple_type($mime_type);
$filehandler->setMimeType($mime_type);
$filehandler->simpletype = $simple_type;
if ($simple_type == 'image') {
if ($filehandler->saveIconFromElggFile($filehandler)) {
$filehandler->thumbnail = $filehandler->getIcon('small')->getFilename();
$filehandler->smallthumb = $filehandler->getIcon('medium')->getFilename();
$filehandler->largethumb = $filehandler->getIcon('large')->getFilename();
}
}
set_input('folder_guid', $parent);
$filehandler->save();
$extracted = true;
if (!empty($parent)) {
add_entity_relationship($parent, FILE_TOOLS_RELATIONSHIP, $filehandler->getGUID());
}
}
}
zip_entry_close($zip_entry);
}
zip_close($zip);
return $extracted;
}
