PHP Cron job to backup to Google Drive - php

Question

I am trying to set up a cron job that will back up various files from my server to Google Drive. I have looked at many solutions and none seem to work! The closest I have got (using oAuth) is this:
<?php
/*
* Copyright 2011 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
require_once __DIR__ . '/../vendor/autoload.php';
require_once "base.php";
echo pageHeader("File Upload - Uploading a large file");
/*************************************************
* Ensure you've downloaded your oauth credentials
************************************************/
if (!$oauth_credentials = getOAuthCredentialsFile()) {
echo missingOAuth2CredentialsWarning();
return;
}
/************************************************
* The redirect URI is to the current page, e.g:
* http://localhost:8080/large-file-upload.php
************************************************/
$redirect_uri = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
echo "<br>$redirect_uri";
$client = new Google_Client();
echo "<br>got client";
$client->setAuthConfig($oauth_credentials);
$client->setRedirectUri($redirect_uri);
$client->addScope("https://www.googleapis.com/auth/drive");
$service = new Google_Service_Drive($client);
// add "?logout" to the URL to remove a token from the session
if (isset($_REQUEST['logout'])) {
unset($_SESSION['upload_token']);
}
echo "<br>got service";
/************************************************
* If we have a code back from the OAuth 2.0 flow,
* we need to exchange that with the
* Google_Client::fetchAccessTokenWithAuthCode()
* function. We store the resultant access token
* bundle in the session, and redirect to ourself.
************************************************/
if (isset($_GET['code'])) {
echo "<br>getting token";
$token = $client->fetchAccessTokenWithAuthCode($_GET['code']);
echo "<br>Got token";
$client->setAccessToken($token);
// store in the session also
$_SESSION['upload_token'] = $token;
// redirect back to the example
header('Location: ' . filter_var($redirect_uri, FILTER_SANITIZE_URL));
}
// set the access token as part of the client
if (!empty($_SESSION['upload_token'])) {
echo "<br>getting access token";
$client->setAccessToken($_SESSION['upload_token']);
if ($client->isAccessTokenExpired()) {
unset($_SESSION['upload_token']);
}
} else {
$authUrl = $client->createAuthUrl();
}
echo "<br>Ready to go";
/************************************************
* If we're signed in then lets try to upload our
* file.
************************************************/
if ($_SERVER['REQUEST_METHOD'] == 'POST' && $client->getAccessToken()) {
/************************************************
* We'll setup an empty 20MB file to upload.
************************************************/
DEFINE("TESTFILE", 'testfile.txt');
if (!file_exists(TESTFILE)) {
$fh = fopen(TESTFILE, 'w');
fseek($fh, 1024*1024*20);
fwrite($fh, "!", 1);
fclose($fh);
}
$file = new Google_Service_Drive_DriveFile();
$file->name = "Big File";
$chunkSizeBytes = 1 * 1024 * 1024;
echo "<br>created file";
// Call the API with the media upload, defer so it doesn't immediately return.
$client->setDefer(true);
$request = $service->files->create($file);
// Create a media file upload to represent our upload process.
$media = new Google_Http_MediaFileUpload(
$client,
$request,
'text/plain',
null,
true,
$chunkSizeBytes
);
$media->setFileSize(filesize(TESTFILE));
echo "<br>created media";
// Upload the various chunks. $status will be false until the process is
// complete.
$status = false;
$handle = fopen(TESTFILE, "rb");
while (!$status && !feof($handle)) {
// read until you get $chunkSizeBytes from TESTFILE
// fread will never return more than 8192 bytes if the stream is read buffered and it does not represent a plain file
// An example of a read buffered file is when reading from a URL
$chunk = readVideoChunk($handle, $chunkSizeBytes);
$status = $media->nextChunk($chunk);
}
// The final value of $status will be the data from the API for the object
// that has been uploaded.
$result = false;
if ($status != false) {
$result = $status;
}
fclose($handle);
}
function readVideoChunk ($handle, $chunkSize)
{
$byteCount = 0;
$giantChunk = "";
while (!feof($handle)) {
// fread will never return more than 8192 bytes if the stream is read buffered and it does not represent a plain file
$chunk = fread($handle, 8192);
$byteCount += strlen($chunk);
$giantChunk .= $chunk;
if ($byteCount >= $chunkSize)
{
return $giantChunk;
}
}
return $giantChunk;
}
?>
<div class="box">
<?php if (isset($authUrl)): ?>
<div class="request">
<a class='login' href='<?= $authUrl ?>'>Connect Me!</a>
</div>
<?php elseif($_SERVER['REQUEST_METHOD'] == 'POST'): ?>
<div class="shortened">
<p>Your call was successful! Check your drive for this file:</p>
<p><?= $result->name ?></p>
<p>Now try downloading a large file from Drive.
</div>
<?php else: ?>
<form method="POST">
<input type="submit" value="Click here to upload a large (20MB) test file" />
</form>
<?php endif ?>
</div>
<?= pageFooter(__FILE__) ?>
But it seems to get as far as the "Getting token" comment and stops - have poked around in the Google API code with more tracing but surely I should not need to do this?
Yes I have oauth credentials set up for this - gets past them

Answer 1

You should consider using a service account if you are working with a cron job which will need to be run without user intervention.
Just note that a service account is a dummy user files uploaded by the service account will be owned by the service account you will need to set the service account up to grant your personal account permissions on the files it uploads.
Also files will be uploaded to the service accounts drive account unless you give it permissions to write to a directory on your personal drive account and upload to that instead.
// Load the Google API PHP Client Library.
require_once __DIR__ . '/vendor/autoload.php';
// Use the developers console and download your service account
// credentials in JSON format. Place the file in this directory or
// change the key file location if necessary.
putenv('GOOGLE_APPLICATION_CREDENTIALS='.__DIR__.'/service-account.json');
/**
* Gets the Google client refreshing auth if needed.
* Documentation: https://developers.google.com/identity/protocols/OAuth2ServiceAccount
* Initializes a client object.
* #return A google client object.
*/
function getGoogleClient() {
return getServiceAccountClient();
}
/**
* Builds the Google client object.
* Documentation: https://developers.google.com/api-client-library/php/auth/service-accounts
* Scopes will need to be changed depending upon the API's being accessed.
* array(Google_Service_Analytics::ANALYTICS_READONLY, Google_Service_Analytics::ANALYTICS)
* List of Google Scopes: https://developers.google.com/identity/protocols/googlescopes
* #return A google client object.
*/
function getServiceAccountClient() {
try {
// Create and configure a new client object.
$client = new Google_Client();
$client->useApplicationDefaultCredentials();
$client->addScope([YOUR SCOPES HERE]);
return $client;
} catch (Exception $e) {
print "An error occurred: " . $e->getMessage();
}
}