nextcloud/lib/files/cache/cache.php

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<?php
/**
* Copyright (c) 2012 Robin Appelman <icewind@owncloud.com>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
namespace OC\Files\Cache;
class Cache {
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const NOT_FOUND = 0;
const PARTIAL = 1; //only partial data available, file not cached in the database
const SHALLOW = 2; //folder in cache, but not all child files are completely scanned
const COMPLETE = 3;
/**
* @var \OC\Files\Storage\Storage
*/
private $storage;
/**
* @var array partial data for the cache
*/
private $partial = array();
private $storageId;
/**
* @param \OC\Files\Storage\Storage $storage
*/
public function __construct(\OC\Files\Storage\Storage $storage) {
$this->storage = $storage;
$this->storageId = $storage->getId();
}
/**
* get the stored metadata of a file or folder
*
* @param string/int $file
* @return array
*/
public function get($file) {
if (is_string($file)) {
$where = 'WHERE `storage` = ? AND `path_hash` = ?';
$params = array($this->storageId, md5($file));
} else { //file id
$where = 'WHERE `fileid` = ?';
$params = array($file);
}
$query = \OC_DB::prepare(
'SELECT `fileid`, `storage`, `path`, `parent`, `name`, `mimetype`, `mimepart`, `size`, `mtime`, `encrypted`
FROM `*PREFIX*filecache` ' . $where);
$result = $query->execute($params);
$data = $result->fetchRow();
//merge partial data
if (!$data and is_string($file)) {
if (isset($this->partial[$file])) {
$data = $this->partial[$file];
}
} else {
//fix types
$data['fileid'] = (int)$data['fileid'];
$data['size'] = (int)$data['size'];
$data['mtime'] = (int)$data['mtime'];
$data['encrypted'] = (bool)$data['encrypted'];
}
return $data;
}
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/**
* get the metadata of all files stored in $folder
*
* @param string $folder
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* @return array
*/
public function getFolderContents($folder) {
$fileId = $this->getId($folder);
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if ($fileId > -1) {
$query = \OC_DB::prepare(
'SELECT `fileid`, `storage`, `path`, `parent`, `name`, `mimetype`, `mimepart`, `size`, `mtime`, `encrypted`
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FROM `*PREFIX*filecache` WHERE parent = ?');
$result = $query->execute(array($fileId));
return $result->fetchAll();
} else {
return array();
}
}
/**
* store meta data for a file or folder
*
* @param string $file
* @param array $data
*
* @return int file id
*/
public function put($file, array $data) {
if (($id = $this->getId($file)) > -1) {
$this->update($id, $data);
return $id;
} else {
if (isset($this->partial[$file])) { //add any saved partial data
$data = array_merge($this->partial[$file], $data);
unset($this->partial[$file]);
}
$requiredFields = array('size', 'mtime', 'mimetype');
foreach ($requiredFields as $field) {
if (!isset($data[$field])) { //data not complete save as partial and return
$this->partial[$file] = $data;
return -1;
}
}
$data['path'] = $file;
$data['parent'] = $this->getParentId($file);
$data['name'] = basename($file);
$data['encrypted'] = isset($data['encrypted']) ? ((int)$data['encrypted']) : 0;
list($queryParts, $params) = $this->buildParts($data);
$queryParts[] = '`storage`';
$params[] = $this->storageId;
$valuesPlaceholder = array_fill(0, count($queryParts), '?');
$query = \OC_DB::prepare('INSERT INTO `*PREFIX*filecache`(' . implode(', ', $queryParts) . ') VALUES(' . implode(', ', $valuesPlaceholder) . ')');
$query->execute($params);
return (int)\OC_DB::insertid('*PREFIX*filecache');
}
}
/**
* update the metadata in the cache
*
* @param int $id
* @param array $data
*/
public function update($id, array $data) {
list($queryParts, $params) = $this->buildParts($data);
$params[] = $id;
$query = \OC_DB::prepare('UPDATE `*PREFIX*filecache` SET ' . implode(' = ?, ', $queryParts) . '=? WHERE fileid = ?');
$query->execute($params);
}
/**
* extract query parts and params array from data array
*
* @param array $data
* @return array
*/
static function buildParts(array $data) {
$fields = array('path', 'parent', 'name', 'mimetype', 'size', 'mtime', 'encrypted');
$params = array();
$queryParts = array();
foreach ($data as $name => $value) {
if (array_search($name, $fields) !== false) {
$params[] = $value;
$queryParts[] = '`' . $name . '`';
if ($name === 'path') {
$params[] = md5($value);
$queryParts[] = '`path_hash`';
} elseif ($name === 'mimetype') {
$params[] = substr($value, 0, strpos($value, '/'));
$queryParts[] = '`mimepart`';
}
}
}
return array($queryParts, $params);
}
/**
* get the file id for a file
*
* @param string $file
* @return int
*/
public function getId($file) {
$pathHash = md5($file);
$query = \OC_DB::prepare('SELECT `fileid` FROM `*PREFIX*filecache` WHERE `storage` = ? AND `path_hash` = ?');
$result = $query->execute(array($this->storageId, $pathHash));
if ($row = $result->fetchRow()) {
return $row['fileid'];
} else {
return -1;
}
}
/**
* get the id of the parent folder of a file
*
* @param string $file
* @return int
*/
public function getParentId($file) {
if ($file === '') {
return -1;
} else {
$parent = dirname($file);
if ($parent === '.') {
$parent = '';
}
return $this->getId($parent);
}
}
/**
* check if a file is available in the cache
*
* @param string $file
* @return bool
*/
public function inCache($file) {
return $this->getId($file) != -1;
}
/**
* remove a file or folder from the cache
*
* @param string $file
*/
public function remove($file) {
$pathHash = md5($file);
$query = \OC_DB::prepare('DELETE FROM `*PREFIX*filecache` WHERE `storage` = ? AND `path_hash` = ?');
$query->execute(array($this->storageId, $pathHash));
}
/**
* remove all entries for files that are stored on the storage from the cache
*/
public function clear() {
$query = \OC_DB::prepare('DELETE FROM `*PREFIX*filecache` WHERE storage=?');
$query->execute(array($this->storageId));
}
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/**
* @param string $file
*
* @return int, Cache::NOT_FOUND, Cache::PARTIAL, Cache::SHALLOW or Cache::COMPLETE
*/
public function getStatus($file) {
$pathHash = md5($file);
$query = \OC_DB::prepare('SELECT * FROM `*PREFIX*filecache` WHERE `storage` = ? AND `path_hash` = ?');
$result = $query->execute(array($this->storageId, $pathHash));
if ($row = $result->fetchRow()) {
if ((int)$row['size'] === -1) {
return self::SHALLOW;
} else {
return self::COMPLETE;
}
} else {
if (isset($this->partial[$file])) {
return self::PARTIAL;
} else {
return self::NOT_FOUND;
}
}
}
}