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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 {
+}