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<?php
/**
* @file
* Classes used for updating various files in the Drupal webroot. These
* classes use a FileTransfer object to actually perform the operations.
* Normally, the FileTransfer is provided when the site owner is redirected to
* authorize.php as part of a multistep process.
*/
/**
* Interface for a class which can update a Drupal project.
*
* An Updater currently serves the following purposes:
* - It can take a given directory, and determine if it can operate on it.
* - It can move the contents of that directory into the appropriate place
* on the system using FileTransfer classes.
* - It can return a list of "next steps" after an update or install.
* - In the future, it will most likely perform some of those steps as well.
*/
interface DrupalUpdaterInterface {
/**
* Checks if the project is installed.
*
* @return bool
*/
public function isInstalled();
/**
* Returns the system name of the project.
*
* @param string $directory
* A directory containing a project.
*/
public static function getProjectName($directory);
/**
* @return string
* An absolute path to the default install location.
*/
public function getInstallDirectory();
/**
* Determine if the Updater can handle the project provided in $directory.
*
* @todo: Provide something more rational here, like a project spec file.
*
* @param string $directory
*
* @return bool
* TRUE if the project is installed, FALSE if not.
*/
public static function canUpdateDirectory($directory);
/**
* Actions to run after an install has occurred.
*/
public function postInstall();
/**
* Actions to run after an update has occurred.
*/
public function postUpdate();
}
/**
* Base class for Updaters used in Drupal.
*/
class Updater {
/**
* @var string $source Directory to install from.
*/
public $source;
public function __construct($source) {
$this->source = $source;
$this->name = self::getProjectName($source);
$this->title = self::getProjectTitle($source);
}
/**
* Return an Updater of the appropriate type depending on the source.
*
* If a directory is provided which contains a module, will return a
* ModuleUpdater.
*
* @param string $source
* Directory of a Drupal project.
*
* @return Updater
*/
public static function factory($source) {
if (is_dir($source)) {
$updater = self::getUpdaterFromDirectory($source);
}
else {
throw new UpdaterException(t('Unable to determine the type of the source directory.'));
}
return new $updater($source);
}
/**
* Determine which Updater class can operate on the given directory.
*
* @param string $directory
* Extracted Drupal project.
*
* @return string
* The class name which can work with this project type.
*/
public static function getUpdaterFromDirectory($directory) {
// Gets a list of possible implementing classes.
$updaters = drupal_get_updaters();
foreach ($updaters as $updater) {
$class = $updater['class'];
if (call_user_func(array($class, 'canUpdateDirectory'), $directory)) {
return $class;
}
}
throw new UpdaterException(t('Cannot determine the type of project.'));
}
/**
* Figure out what the most important (or only) info file is in a directory.
*
* Since there is no enforcement of which info file is the project's "main"
* info file, this will get one with the same name as the directory, or the
* first one it finds. Not ideal, but needs a larger solution.
*
* @param string $directory
* Directory to search in.
*
* @return string
* Path to the info file.
*/
public static function findInfoFile($directory) {
$info_files = file_scan_directory($directory, '/.*\.info$/');
if (!$info_files) {
return FALSE;
}
foreach ($info_files as $info_file) {
if (drupal_substr($info_file->filename, 0, -5) == drupal_basename($directory)) {
// Info file Has the same name as the directory, return it.
return $info_file->uri;
}
}
// Otherwise, return the first one.
$info_file = array_shift($info_files);
return $info_file->uri;
}
/**
* Get the name of the project directory (basename).
*
* @todo: It would be nice, if projects contained an info file which could
* provide their canonical name.
*
* @param string $directory
*
* @return string
* The name of the project.
*/
public static function getProjectName($directory) {
return drupal_basename($directory);
}
/**
* Return the project name from a Drupal info file.
*
* @param string $directory
* Directory to search for the info file.
*
* @return string
* The title of the project.
*/
public static function getProjectTitle($directory) {
$info_file = self::findInfoFile($directory);
$info = drupal_parse_info_file($info_file);
if (empty($info)) {
throw new UpdaterException(t('Unable to parse info file: %info_file.', array('%info_file' => $info_file)));
}
if (empty($info['name'])) {
throw new UpdaterException(t("The info file (%info_file) does not define a 'name' attribute.", array('%info_file' => $info_file)));
}
return $info['name'];
}
/**
* Store the default parameters for the Updater.
*
* @param array $overrides
* An array of overrides for the default parameters.
*
* @return array
* An array of configuration parameters for an update or install operation.
*/
protected function getInstallArgs($overrides = array()) {
$args = array(
'make_backup' => FALSE,
'install_dir' => $this->getInstallDirectory(),
'backup_dir' => $this->getBackupDir(),
);
return array_merge($args, $overrides);
}
/**
* Updates a Drupal project, returns a list of next actions.
*
* @param FileTransfer $filetransfer
* Object that is a child of FileTransfer. Used for moving files
* to the server.
* @param array $overrides
* An array of settings to override defaults; see self::getInstallArgs().
*
* @return array
* An array of links which the user may need to complete the update
*/
public function update(&$filetransfer, $overrides = array()) {
try {
// Establish arguments with possible overrides.
$args = $this->getInstallArgs($overrides);
// Take a Backup.
if ($args['make_backup']) {
$this->makeBackup($args['install_dir'], $args['backup_dir']);
}
if (!$this->name) {
// This is bad, don't want to delete the install directory.
throw new UpdaterException(t('Fatal error in update, cowardly refusing to wipe out the install directory.'));
}
// Make sure the installation parent directory exists and is writable.
$this->prepareInstallDirectory($filetransfer, $args['install_dir']);
// Note: If the project is installed in sites/all, it will not be
// deleted. It will be installed in sites/default as that will override
// the sites/all reference and not break other sites which are using it.
if (is_dir($args['install_dir'] . '/' . $this->name)) {
// Remove the existing installed file.
$filetransfer->removeDirectory($args['install_dir'] . '/' . $this->name);
}
// Copy the directory in place.
$filetransfer->copyDirectory($this->source, $args['install_dir']);
// Make sure what we just installed is readable by the web server.
$this->makeWorldReadable($filetransfer, $args['install_dir'] . '/' . $this->name);
// Run the updates.
// @TODO: decide if we want to implement this.
$this->postUpdate();
// For now, just return a list of links of things to do.
return $this->postUpdateTasks();
}
catch (FileTransferException $e) {
throw new UpdaterFileTransferException(t('File Transfer failed, reason: !reason', array('!reason' => strtr($e->getMessage(), $e->arguments))));
}
}
/**
* Installs a Drupal project, returns a list of next actions.
*
* @param FileTransfer $filetransfer
* Object that is a child of FileTransfer.
* @param array $overrides
* An array of settings to override defaults; see self::getInstallArgs().
*
* @return array
* An array of links which the user may need to complete the install.
*/
public function install(&$filetransfer, $overrides = array()) {
try {
// Establish arguments with possible overrides.
$args = $this->getInstallArgs($overrides);
// Make sure the installation parent directory exists and is writable.
$this->prepareInstallDirectory($filetransfer, $args['install_dir']);
// Copy the directory in place.
$filetransfer->copyDirectory($this->source, $args['install_dir']);
// Make sure what we just installed is readable by the web server.
$this->makeWorldReadable($filetransfer, $args['install_dir'] . '/' . $this->name);
// Potentially enable something?
// @TODO: decide if we want to implement this.
$this->postInstall();
// For now, just return a list of links of things to do.
return $this->postInstallTasks();
}
catch (FileTransferException $e) {
throw new UpdaterFileTransferException(t('File Transfer failed, reason: !reason', array('!reason' => strtr($e->getMessage(), $e->arguments))));
}
}
/**
* Make sure the installation parent directory exists and is writable.
*
* @param FileTransfer $filetransfer
* Object which is a child of FileTransfer.
* @param string $directory
* The installation directory to prepare.
*/
public function prepareInstallDirectory(&$filetransfer, $directory) {
// Make the parent dir writable if need be and create the dir.
if (!is_dir($directory)) {
$parent_dir = dirname($directory);
if (!is_writable($parent_dir)) {
@chmod($parent_dir, 0755);
// It is expected that this will fail if the directory is owned by the
// FTP user. If the FTP user == web server, it will succeed.
try {
$filetransfer->createDirectory($directory);
$this->makeWorldReadable($filetransfer, $directory);
}
catch (FileTransferException $e) {
// Probably still not writable. Try to chmod and do it again.
// @todo: Make a new exception class so we can catch it differently.
try {
$old_perms = substr(sprintf('%o', fileperms($parent_dir)), -4);
$filetransfer->chmod($parent_dir, 0755);
$filetransfer->createDirectory($directory);
$this->makeWorldReadable($filetransfer, $directory);
// Put the permissions back.
$filetransfer->chmod($parent_dir, intval($old_perms, 8));
}
catch (FileTransferException $e) {
$message = t($e->getMessage(), $e->arguments);
$throw_message = t('Unable to create %directory due to the following: %reason', array('%directory' => $directory, '%reason' => $message));
throw new UpdaterException($throw_message);
}
}
// Put the parent directory back.
@chmod($parent_dir, 0555);
}
}
}
/**
* Ensure that a given directory is world readable.
*
* @param FileTransfer $filetransfer
* Object which is a child of FileTransfer.
* @param string $path
* The file path to make world readable.
* @param bool $recursive
* If the chmod should be applied recursively.
*/
public function makeWorldReadable(&$filetransfer, $path, $recursive = TRUE) {
if (!is_executable($path)) {
// Set it to read + execute.
$new_perms = substr(sprintf('%o', fileperms($path)), -4, -1) . "5";
$filetransfer->chmod($path, intval($new_perms, 8), $recursive);
}
}
/**
* Perform a backup.
*
* @todo Not implemented.
*/
public function makeBackup(&$filetransfer, $from, $to) {
}
/**
* Return the full path to a directory where backups should be written.
*/
public function getBackupDir() {
return file_stream_wrapper_get_instance_by_scheme('temporary')->getDirectoryPath();
}
/**
* Perform actions after new code is updated.
*/
public function postUpdate() {
}
/**
* Perform actions after installation.
*/
public function postInstall() {
}
/**
* Return an array of links to pages that should be visited post operation.
*
* @return array
* Links which provide actions to take after the install is finished.
*/
public function postInstallTasks() {
return array();
}
/**
* Return an array of links to pages that should be visited post operation.
*
* @return array
* Links which provide actions to take after the update is finished.
*/
public function postUpdateTasks() {
return array();
}
}
/**
* Exception class for the Updater class hierarchy.
*
* This is identical to the base Exception class, we just give it a more
* specific name so that call sites that want to tell the difference can
* specifically catch these exceptions and treat them differently.
*/
class UpdaterException extends Exception {
}
/**
* Child class of UpdaterException that indicates a FileTransfer exception.
*
* We have to catch FileTransfer exceptions and wrap those in t(), since
* FileTransfer is so low-level that it doesn't use any Drupal APIs and none
* of the strings are translated.
*/
class UpdaterFileTransferException extends UpdaterException {
}