Using Google Drive API to restore files removed from shared folders

google-drive-restore.php

<?php
/**
 * Requires "google/apiclient"
 */

class GoogleDriveRestore
{
    /** @var Google_Client */
    private $client;

    /**
     * It needs a list of the files to be restored.
     * 
     * @see https://developers.google.com/admin-sdk/reports/v1/reference/activities
     * @param $files
     */
    public function restore($files)
    {
        foreach ($files as $file) {
            $this->restoreDocument($file['owner'], $file['fileId'], $file['parentId']);
        }
    }

    /**
     * @param string $actor
     * @return \Google_Auth_AssertionCredentials
     */
    private function buildCredentials($actor)
    {
        $privateKeyPath = '../GoogleServiceAccount-59cce8265c72.p12';
        if (!is_readable($privateKeyPath)) {
            throw new \RuntimeException("Server must be fully configured to remove this item");
        }

        return new \Google_Auth_AssertionCredentials(
            '[email protected]',
            array('https://www.googleapis.com/auth/drive'),
            file_get_contents($privateKeyPath),
            'notasecret',
            'http://oauth.net/grant_type/jwt/1.0/bearer',
            $actor
        );
    }

    /**
     * @param $ownerEmailAddress
     * @param $fileId
     * @param $parentId
     * @return Google_Service_Drive_DriveFile
     */
    protected function restoreDocument($ownerEmailAddress, $fileId, $parentId)
    {
        $this->client = new \Google_Client();
        $this->client->setAssertionCredentials($this->buildCredentials($ownerEmailAddress));
        /** @var \Google_Auth_OAuth2 $auth */
        $auth = $this->client->getAuth();
        if ($auth->isAccessTokenExpired()) {
            $auth->refreshTokenWithAssertion();
        }

        $drive = new \Google_Service_Drive($this->client);

        $file = $drive->files->get($fileId);
        if ($file->id !== $fileId) {
            print "\n\033[1;31mFile ID didn't match\033[0m";
        }
        if ($this->hasParent($file, $parentId)) {
            print "\n\033[1;33mAlready done\033[0m";

            return $file;
        }

        $file = new Google_Service_Drive_DriveFile();
        $file = $drive->files->patch($fileId, $file, array('addParents' => "$parentId"));

        if ($this->hasParent($file, $parentId)) {
            print "\n\033[1;32mSuccess\033[0m";
        } else {
            print "\n\033[1;31mFailed\033[0m";
        }

        return $file;
    }

    /**
     * @param Google_Service_Drive_DriveFile $file
     * @param $parentId
     * @return bool
     */
    private function hasParent(\Google_Service_Drive_DriveFile $file, $parentId)
    {
        $parents = $file->getParents();

        return isset($parents[0]) && $parents[0]['id'] === $parentId;
    }
}