nextcloud/apps/files_external/lib/config.php

742 lines
24 KiB
PHP
Raw Normal View History

<?php
/**
* ownCloud
*
* @author Michael Gapczynski
* @copyright 2012 Michael Gapczynski mtgap@owncloud.com
* @copyright 2014 Vincent Petry <pvince81@owncloud.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library 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 AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
set_include_path(
get_include_path() . PATH_SEPARATOR .
\OC_App::getAppPath('files_external') . '/3rdparty/phpseclib/phpseclib'
);
/**
* Class to configure mount.json globally and for users
*/
class OC_Mount_Config {
// TODO: make this class non-static and give it a proper namespace
const MOUNT_TYPE_GLOBAL = 'global';
const MOUNT_TYPE_GROUP = 'group';
const MOUNT_TYPE_USER = 'user';
// whether to skip backend test (for unit tests, as this static class is not mockable)
public static $skipTest = false;
/**
* Get details on each of the external storage backends, used for the mount config UI
* If a custom UI is needed, add the key 'custom' and a javascript file with that name will be loaded
* If the configuration parameter should be secret, add a '*' to the beginning of the value
* If the configuration parameter is a boolean, add a '!' to the beginning of the value
* If the configuration parameter is optional, add a '&' to the beginning of the value
2013-04-19 00:20:52 +04:00
* If the configuration parameter is hidden, add a '#' to the beginning of the value
* @return string
*/
public static function getBackends() {
2013-02-22 20:21:57 +04:00
// FIXME: do not rely on php key order for the options order in the UI
2012-12-15 05:21:26 +04:00
$backends['\OC\Files\Storage\Local']=array(
'backend' => 'Local',
'configuration' => array(
'datadir' => 'Location'));
2012-12-15 05:21:26 +04:00
$backends['\OC\Files\Storage\AmazonS3']=array(
'backend' => 'Amazon S3 and compliant',
'configuration' => array(
2013-07-03 19:58:44 +04:00
'key' => 'Access Key',
'secret' => '*Secret Key',
'bucket' => 'Bucket',
'hostname' => '&Hostname (optional)',
'port' => '&Port (optional)',
'region' => '&Region (optional)',
2013-07-03 19:58:44 +04:00
'use_ssl' => '!Enable SSL',
'use_path_style' => '!Enable Path Style'));
2012-12-15 05:21:26 +04:00
$backends['\OC\Files\Storage\Dropbox']=array(
'backend' => 'Dropbox',
'configuration' => array(
'configured' => '#configured',
'app_key' => 'App key',
'app_secret' => '*App secret',
'token' => '#token',
'token_secret' => '#token_secret'),
'custom' => 'dropbox');
2012-12-15 05:21:26 +04:00
if(OC_Mount_Config::checkphpftp()) $backends['\OC\Files\Storage\FTP']=array(
'backend' => 'FTP',
'configuration' => array(
'host' => 'Hostname',
'user' => 'Username',
'password' => '*Password',
'root' => '&Root',
'secure' => '!Secure ftps://'));
if(OC_Mount_Config::checkcurl()) $backends['\OC\Files\Storage\Google']=array(
'backend' => 'Google Drive',
'configuration' => array(
'configured' => '#configured',
'client_id' => 'Client ID',
'client_secret' => '*Client secret',
'token' => '#token'),
'custom' => 'google');
2013-02-22 20:21:57 +04:00
if(OC_Mount_Config::checkcurl()) {
$backends['\OC\Files\Storage\Swift'] = array(
'backend' => 'OpenStack Object Storage',
'configuration' => array(
'user' => 'Username (required)',
'bucket' => 'Bucket (required)',
2013-10-29 13:21:50 +04:00
'region' => '&Region (optional for OpenStack Object Storage)',
'key' => '*API Key (required for Rackspace Cloud Files)',
2013-10-29 13:21:50 +04:00
'tenant' => '&Tenantname (required for OpenStack Object Storage)',
'password' => '*Password (required for OpenStack Object Storage)',
2013-10-29 13:21:50 +04:00
'service_name' => '&Service Name (required for OpenStack Object Storage)',
'url' => '&URL of identity endpoint (required for OpenStack Object Storage)',
'timeout' => '&Timeout of HTTP requests in seconds (optional)',
)
);
}
2013-02-22 20:21:57 +04:00
2013-08-15 14:00:02 +04:00
if (!OC_Util::runningOnWindows()) {
if (OC_Mount_Config::checksmbclient()) {
$backends['\OC\Files\Storage\SMB'] = array(
'backend' => 'SMB / CIFS',
'configuration' => array(
'host' => 'URL',
'user' => 'Username',
'password' => '*Password',
'share' => 'Share',
'root' => '&Root'));
}
}
2013-02-22 20:21:57 +04:00
if(OC_Mount_Config::checkcurl()){
$backends['\OC\Files\Storage\DAV']=array(
'backend' => 'WebDAV',
'configuration' => array(
'host' => 'URL',
'user' => 'Username',
'password' => '*Password',
'root' => '&Root',
'secure' => '!Secure https://'));
$backends['\OC\Files\Storage\OwnCloud']=array(
'backend' => 'ownCloud',
'configuration' => array(
'host' => 'URL',
'user' => 'Username',
'password' => '*Password',
'root' => '&Remote subfolder',
'secure' => '!Secure https://'));
}
2013-02-22 20:21:57 +04:00
$backends['\OC\Files\Storage\SFTP']=array(
'backend' => 'SFTP',
'configuration' => array(
'host' => 'URL',
2013-02-22 20:21:57 +04:00
'user' => 'Username',
'password' => '*Password',
'root' => '&Root'));
$backends['\OC\Files\Storage\iRODS']=array(
'backend' => 'iRODS',
'configuration' => array(
'host' => 'Host',
'port' => 'Port',
2013-04-19 00:20:52 +04:00
'use_logon_credentials' => '!Use ownCloud login',
'user' => 'Username',
'password' => '*Password',
2013-04-26 19:37:41 +04:00
'auth_mode' => 'Authentication Mode',
'zone' => 'Zone'));
return($backends);
}
/**
* Hook that mounts the given user's visible mount points
* @param array $data
*/
public static function initMountPointsHook($data) {
$mountPoints = self::getAbsoluteMountPoints($data['user']);
2014-03-20 15:52:09 +04:00
foreach ($mountPoints as $mountPoint => $options) {
\OC\Files\Filesystem::mount($options['class'], $options['options'], $mountPoint);
}
}
/**
* Returns the mount points for the given user.
* The mount point is relative to the data directory.
*
* @param string $user user
* @return array of mount point string as key, mountpoint config as value
*/
public static function getAbsoluteMountPoints($user) {
$mountPoints = array();
$datadir = \OC_Config::getValue("datadirectory", \OC::$SERVERROOT . "/data");
$mount_file = \OC_Config::getValue("mount_file", $datadir . "/mount.json");
//move config file to it's new position
if (is_file(\OC::$SERVERROOT . '/config/mount.json')) {
rename(\OC::$SERVERROOT . '/config/mount.json', $mount_file);
}
// Load system mount points
$mountConfig = self::readData(false);
if (isset($mountConfig[self::MOUNT_TYPE_GLOBAL])) {
foreach ($mountConfig[self::MOUNT_TYPE_GLOBAL] as $mountPoint => $options) {
$options['options'] = self::decryptPasswords($options['options']);
$mountPoints[$mountPoint] = $options;
}
}
if (isset($mountConfig[self::MOUNT_TYPE_GROUP])) {
foreach ($mountConfig[self::MOUNT_TYPE_GROUP] as $group => $mounts) {
if (\OC_Group::inGroup($user, $group)) {
foreach ($mounts as $mountPoint => $options) {
$mountPoint = self::setUserVars($user, $mountPoint);
foreach ($options as &$option) {
$option = self::setUserVars($user, $option);
}
$options['options'] = self::decryptPasswords($options['options']);
$mountPoints[$mountPoint] = $options;
}
}
}
}
if (isset($mountConfig[self::MOUNT_TYPE_USER])) {
foreach ($mountConfig[self::MOUNT_TYPE_USER] as $mountUser => $mounts) {
if ($mountUser === 'all' or strtolower($mountUser) === strtolower($user)) {
foreach ($mounts as $mountPoint => $options) {
$mountPoint = self::setUserVars($user, $mountPoint);
foreach ($options as &$option) {
$option = self::setUserVars($user, $option);
}
$options['options'] = self::decryptPasswords($options['options']);
$mountPoints[$mountPoint] = $options;
}
}
}
}
// Load personal mount points
$mountConfig = self::readData(true);
if (isset($mountConfig[self::MOUNT_TYPE_USER][$user])) {
foreach ($mountConfig[self::MOUNT_TYPE_USER][$user] as $mountPoint => $options) {
$options['options'] = self::decryptPasswords($options['options']);
$mountPoints[$mountPoint] = $options;
}
}
return $mountPoints;
}
/**
* fill in the correct values for $user
*
* @param string $user
* @param string $input
* @return string
*/
private static function setUserVars($user, $input) {
return str_replace('$user', $user, $input);
}
/**
* Get details on each of the external storage backends, used for the mount config UI
* Some backends are not available as a personal backend, f.e. Local and such that have
* been disabled by the admin.
*
* If a custom UI is needed, add the key 'custom' and a javascript file with that name will be loaded
* If the configuration parameter should be secret, add a '*' to the beginning of the value
* If the configuration parameter is a boolean, add a '!' to the beginning of the value
* If the configuration parameter is optional, add a '&' to the beginning of the value
* If the configuration parameter is hidden, add a '#' to the beginning of the value
* @return array
*/
public static function getPersonalBackends() {
$backends = self::getBackends();
// Remove local storage and other disabled storages
unset($backends['\OC\Files\Storage\Local']);
$allowed_backends = explode(',', OCP\Config::getAppValue('files_external', 'user_mounting_backends', ''));
foreach ($backends as $backend => $null) {
if (!in_array($backend, $allowed_backends)) {
unset($backends[$backend]);
}
}
return $backends;
}
/**
* Get the system mount points
* The returned array is not in the same format as getUserMountPoints()
* @return array
*/
public static function getSystemMountPoints() {
$mountPoints = self::readData(false);
$backends = self::getBackends();
$system = array();
if (isset($mountPoints[self::MOUNT_TYPE_GROUP])) {
foreach ($mountPoints[self::MOUNT_TYPE_GROUP] as $group => $mounts) {
foreach ($mounts as $mountPoint => $mount) {
// Update old classes to new namespace
if (strpos($mount['class'], 'OC_Filestorage_') !== false) {
$mount['class'] = '\OC\Files\Storage\\'.substr($mount['class'], 15);
}
$mount['options'] = self::decryptPasswords($mount['options']);
// Remove '/$user/files/' from mount point
$mountPoint = substr($mountPoint, 13);
$config = array(
'class' => $mount['class'],
'mountpoint' => $mountPoint,
'backend' => $backends[$mount['class']]['backend'],
'options' => $mount['options'],
'applicable' => array('groups' => array($group), 'users' => array()),
'status' => self::getBackendStatus($mount['class'], $mount['options'])
);
$hash = self::makeConfigHash($config);
// If an existing config exists (with same class, mountpoint and options)
if (isset($system[$hash])) {
// add the groups into that config
$system[$hash]['applicable']['groups']
= array_merge($system[$hash]['applicable']['groups'], array($group));
} else {
$system[$hash] = $config;
}
}
}
}
if (isset($mountPoints[self::MOUNT_TYPE_USER])) {
foreach ($mountPoints[self::MOUNT_TYPE_USER] as $user => $mounts) {
foreach ($mounts as $mountPoint => $mount) {
// Update old classes to new namespace
if (strpos($mount['class'], 'OC_Filestorage_') !== false) {
$mount['class'] = '\OC\Files\Storage\\'.substr($mount['class'], 15);
}
$mount['options'] = self::decryptPasswords($mount['options']);
// Remove '/$user/files/' from mount point
$mountPoint = substr($mountPoint, 13);
$config = array(
'class' => $mount['class'],
'mountpoint' => $mountPoint,
'backend' => $backends[$mount['class']]['backend'],
'options' => $mount['options'],
'applicable' => array('groups' => array(), 'users' => array($user)),
'status' => self::getBackendStatus($mount['class'], $mount['options'])
);
$hash = self::makeConfigHash($config);
// If an existing config exists (with same class, mountpoint and options)
if (isset($system[$hash])) {
// add the users into that config
$system[$hash]['applicable']['users']
= array_merge($system[$hash]['applicable']['users'], array($user));
} else {
$system[$hash] = $config;
}
}
}
}
return array_values($system);
}
/**
* Get the personal mount points of the current user
* The returned array is not in the same format as getUserMountPoints()
* @return array
*/
public static function getPersonalMountPoints() {
$mountPoints = self::readData(true);
$backends = self::getBackends();
$uid = OCP\User::getUser();
$personal = array();
if (isset($mountPoints[self::MOUNT_TYPE_USER][$uid])) {
foreach ($mountPoints[self::MOUNT_TYPE_USER][$uid] as $mountPoint => $mount) {
// Update old classes to new namespace
if (strpos($mount['class'], 'OC_Filestorage_') !== false) {
$mount['class'] = '\OC\Files\Storage\\'.substr($mount['class'], 15);
}
$mount['options'] = self::decryptPasswords($mount['options']);
$personal[] = array(
'class' => $mount['class'],
// Remove '/uid/files/' from mount point
'mountpoint' => substr($mountPoint, strlen($uid) + 8),
'backend' => $backends[$mount['class']]['backend'],
'options' => $mount['options'],
'status' => self::getBackendStatus($mount['class'], $mount['options'])
);
}
}
return $personal;
}
/**
* Test connecting using the given backend configuration
* @param string $class backend class name
* @param array $options backend configuration options
* @return bool true if the connection succeeded, false otherwise
*/
private static function getBackendStatus($class, $options) {
if (self::$skipTest) {
return true;
}
foreach ($options as &$option) {
$option = self::setUserVars(OCP\User::getUser(), $option);
}
if (class_exists($class)) {
try {
$storage = new $class($options);
return $storage->test();
} catch (Exception $exception) {
\OCP\Util::logException('files_external', $exception);
return false;
}
}
return false;
}
/**
* Add a mount point to the filesystem
* @param string $mountPoint Mount point
* @param string $class Backend class
* @param array Backend parameters for the class
* @param string $mountType MOUNT_TYPE_GROUP | MOUNT_TYPE_USER
* @param string $applicable User or group to apply mount to
* @param bool Personal or system mount point i.e. is this being called from the personal or admin page
* @return boolean
*/
public static function addMountPoint($mountPoint,
$class,
$classOptions,
$mountType,
$applicable,
$isPersonal = false) {
$backends = self::getBackends();
$mountPoint = OC\Files\Filesystem::normalizePath($mountPoint);
if ($mountPoint === '' || $mountPoint === '/' || $mountPoint == '/Shared') {
// can't mount at root or "Shared" folder
return false;
}
if (!isset($backends[$class])) {
// invalid backend
return false;
}
if ($isPersonal) {
// Verify that the mount point applies for the current user
// Prevent non-admin users from mounting local storage and other disabled backends
$allowed_backends = self::getPersonalBackends();
if ($applicable != OCP\User::getUser() || !isset($allowed_backends[$class])) {
return false;
}
$mountPoint = '/'.$applicable.'/files/'.ltrim($mountPoint, '/');
} else {
$mountPoint = '/$user/files/'.ltrim($mountPoint, '/');
}
$mount = array($applicable => array(
$mountPoint => array(
'class' => $class,
'options' => self::encryptPasswords($classOptions))
)
);
$mountPoints = self::readData($isPersonal);
// Merge the new mount point into the current mount points
if (isset($mountPoints[$mountType])) {
if (isset($mountPoints[$mountType][$applicable])) {
$mountPoints[$mountType][$applicable]
= array_merge($mountPoints[$mountType][$applicable], $mount[$applicable]);
} else {
$mountPoints[$mountType] = array_merge($mountPoints[$mountType], $mount);
}
} else {
$mountPoints[$mountType] = $mount;
}
self::writeData($isPersonal, $mountPoints);
return self::getBackendStatus($class, $classOptions);
}
/**
*
* @param string Mount point
* @param string MOUNT_TYPE_GROUP | MOUNT_TYPE_USER
* @param string User or group to remove mount from
* @param bool Personal or system mount point
* @return bool
*/
public static function removeMountPoint($mountPoint, $mountType, $applicable, $isPersonal = false) {
// Verify that the mount point applies for the current user
if ($isPersonal) {
if ($applicable != OCP\User::getUser()) {
return false;
}
$mountPoint = '/'.$applicable.'/files/'.ltrim($mountPoint, '/');
} else {
$mountPoint = '/$user/files/'.ltrim($mountPoint, '/');
}
$mountPoints = self::readData($isPersonal);
// Remove mount point
unset($mountPoints[$mountType][$applicable][$mountPoint]);
// Unset parent arrays if empty
if (empty($mountPoints[$mountType][$applicable])) {
unset($mountPoints[$mountType][$applicable]);
if (empty($mountPoints[$mountType])) {
unset($mountPoints[$mountType]);
}
}
self::writeData($isPersonal, $mountPoints);
return true;
}
/**
* Read the mount points in the config file into an array
* @param boolean $isPersonal Personal or system config file
* @return array
*/
private static function readData($isPersonal) {
$parser = new \OC\ArrayParser();
if ($isPersonal) {
2013-02-16 04:50:40 +04:00
$phpFile = OC_User::getHome(OCP\User::getUser()).'/mount.php';
$jsonFile = OC_User::getHome(OCP\User::getUser()).'/mount.json';
} else {
2013-02-16 04:50:40 +04:00
$phpFile = OC::$SERVERROOT.'/config/mount.php';
2014-02-24 13:35:24 +04:00
$datadir = \OC_Config::getValue('datadirectory', \OC::$SERVERROOT . '/data/');
$jsonFile = \OC_Config::getValue('mount_file', $datadir . '/mount.json');
}
2013-02-16 04:50:40 +04:00
if (is_file($jsonFile)) {
$mountPoints = json_decode(file_get_contents($jsonFile), true);
if (is_array($mountPoints)) {
return $mountPoints;
}
} elseif (is_file($phpFile)) {
$mountPoints = $parser->parsePHP(file_get_contents($phpFile));
if (is_array($mountPoints)) {
return $mountPoints;
}
}
return array();
}
/**
* Write the mount points to the config file
* @param bool Personal or system config file
* @param array Mount points
* @param boolean $isPersonal
*/
private static function writeData($isPersonal, $data) {
if ($isPersonal) {
2013-02-16 04:50:40 +04:00
$file = OC_User::getHome(OCP\User::getUser()).'/mount.json';
} else {
2014-02-24 13:35:24 +04:00
$datadir = \OC_Config::getValue('datadirectory', \OC::$SERVERROOT . '/data/');
$file = \OC_Config::getValue('mount_file', $datadir . '/mount.json');
}
2014-03-26 14:29:04 +04:00
$options = 0;
if (defined('JSON_PRETTY_PRINT')) {
// only for PHP >= 5.4
$options = JSON_PRETTY_PRINT;
}
$content = json_encode($data, $options);
@file_put_contents($file, $content);
@chmod($file, 0640);
}
/**
* Returns all user uploaded ssl root certificates
* @return array
*/
public static function getCertificates() {
$path=OC_User::getHome(OC_User::getUser()) . '/files_external/uploads/';
\OCP\Util::writeLog('files_external', 'checking path '.$path, \OCP\Util::INFO);
if ( ! is_dir($path)) {
//path might not exist (e.g. non-standard OC_User::getHome() value)
//in this case create full path using 3rd (recursive=true) parameter.
mkdir($path, 0777, true);
}
$result = array();
$handle = opendir($path);
2013-09-05 13:58:57 +04:00
if(!is_resource($handle)) {
return array();
}
while (false !== ($file = readdir($handle))) {
if ($file != '.' && $file != '..') $result[] = $file;
}
return $result;
}
/**
* creates certificate bundle
*/
public static function createCertificateBundle() {
$path=OC_User::getHome(OC_User::getUser()) . '/files_external';
$certs = OC_Mount_Config::getCertificates();
$fh_certs = fopen($path."/rootcerts.crt", 'w');
foreach ($certs as $cert) {
$file=$path.'/uploads/'.$cert;
$fh = fopen($file, "r");
$data = fread($fh, filesize($file));
fclose($fh);
if (strpos($data, 'BEGIN CERTIFICATE')) {
fwrite($fh_certs, $data);
fwrite($fh_certs, "\r\n");
}
}
fclose($fh_certs);
return true;
}
/**
2013-01-14 23:30:39 +04:00
* check if smbclient is installed
*/
public static function checksmbclient() {
if(function_exists('shell_exec')) {
$output=shell_exec('command -v smbclient 2> /dev/null');
2013-08-17 14:58:10 +04:00
return !empty($output);
}else{
2013-08-17 14:58:10 +04:00
return false;
}
}
/**
2013-02-22 20:21:57 +04:00
* check if php-ftp is installed
*/
public static function checkphpftp() {
if(function_exists('ftp_login')) {
2013-08-17 14:58:10 +04:00
return true;
}else{
2013-08-17 14:58:10 +04:00
return false;
}
}
/**
* check if curl is installed
*/
public static function checkcurl() {
2013-08-17 14:58:10 +04:00
return function_exists('curl_init');
}
/**
* check dependencies
*/
public static function checkDependencies() {
2012-12-11 17:07:01 +04:00
$l= new OC_L10N('files_external');
$txt='';
2013-08-15 14:00:02 +04:00
if (!OC_Util::runningOnWindows()) {
if(!OC_Mount_Config::checksmbclient()) {
$txt.=$l->t('<b>Warning:</b> "smbclient" is not installed. Mounting of CIFS/SMB shares is not possible. Please ask your system administrator to install it.').'<br />';
}
2013-02-14 20:57:19 +04:00
}
if(!OC_Mount_Config::checkphpftp()) {
2013-02-15 18:54:51 +04:00
$txt.=$l->t('<b>Warning:</b> The FTP support in PHP is not enabled or installed. Mounting of FTP shares is not possible. Please ask your system administrator to install it.').'<br />';
2013-02-14 20:57:19 +04:00
}
if(!OC_Mount_Config::checkcurl()) {
$txt.=$l->t('<b>Warning:</b> The Curl support in PHP is not enabled or installed. Mounting of ownCloud / WebDAV or GoogleDrive is not possible. Please ask your system administrator to install it.').'<br />';
}
2013-08-17 14:58:10 +04:00
return $txt;
}
/**
* Encrypt passwords in the given config options
* @param array $options mount options
* @return array updated options
*/
private static function encryptPasswords($options) {
if (isset($options['password'])) {
$options['password_encrypted'] = self::encryptPassword($options['password']);
// do not unset the password, we want to keep the keys order
// on load... because that's how the UI currently works
$options['password'] = '';
}
return $options;
}
/**
* Decrypt passwords in the given config options
* @param array $options mount options
* @return array updated options
*/
private static function decryptPasswords($options) {
// note: legacy options might still have the unencrypted password in the "password" field
if (isset($options['password_encrypted'])) {
$options['password'] = self::decryptPassword($options['password_encrypted']);
unset($options['password_encrypted']);
}
return $options;
}
/**
* Encrypt a single password
* @param string $password plain text password
* @return encrypted password
*/
private static function encryptPassword($password) {
$cipher = self::getCipher();
$iv = \OCP\Util::generateRandomBytes(16);
$cipher->setIV($iv);
return base64_encode($iv . $cipher->encrypt($password));
}
/**
* Decrypts a single password
* @param string $encryptedPassword encrypted password
* @return plain text password
*/
private static function decryptPassword($encryptedPassword) {
$cipher = self::getCipher();
$binaryPassword = base64_decode($encryptedPassword);
$iv = substr($binaryPassword, 0, 16);
$cipher->setIV($iv);
$binaryPassword = substr($binaryPassword, 16);
return $cipher->decrypt($binaryPassword);
}
/**
* Returns the encryption cipher
*/
private static function getCipher() {
if (!class_exists('Crypt_AES', false)) {
include('Crypt/AES.php');
}
$cipher = new Crypt_AES(CRYPT_AES_MODE_CBC);
$cipher->setKey(\OCP\Config::getSystemValue('passwordsalt'));
return $cipher;
}
/**
* Computes a hash based on the given configuration.
* This is mostly used to find out whether configurations
* are the same.
*/
private static function makeConfigHash($config) {
$data = json_encode(
array(
'c' => $config['class'],
'm' => $config['mountpoint'],
'o' => $config['options']
)
);
return hash('md5', $data);
}
}