Get Firestore access token for REST api with google-api-php lib

user_8979103 0
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I'm trying to get an access token to make REST calls to my Firestore DB. I'm using PHP (only way for now) and have taken the next steps:

And created this code:

putenv('GOOGLE_APPLICATION_CREDENTIALS='.__DIR__ .'/key.json');
$client = new Google_Client();
$client->useApplicationDefaultCredentials();
$client->addScope('https://www.googleapis.com/auth/datastore,https://www.googleapis.com/auth/cloud-platform');
$client->authorize();

I also replaced the

$client->useApplicationDefaultCredentials();

part with

$client->setAuthConfig(__DIR__ .'/key.json');

Now when I var_dump the $client, the token stays NULL.

I just can't figure out, how to get the access_token for my service account. Anybody an idea how I can get an access token?

google-api-php-client google-cloud-firestore firebase php
1 Answers

  1. If you want to add multiple scopes, you will have to use an array instead of a string. A string will only be treated as one single scope.

  2. The $client->authorize() returns a Client instance which is authorized to to access the Google Services for the given scopes. So, $authorizedClient = $client->authorize(); would be more appropriate.

  3. If you just want to retrieve the access token, you could use $client->fetchAccessTokenWithAssertion(), which would give you something like this:

    Array
(
    [access_token] => ya29.c..............
    [token_type] => Bearer
    [expires_in] => 3600
    [created] => 1511280489
)

Here is the complete script I used to test this:

<?php

require __DIR__.'/vendor/autoload.php';

$client = new Google_Client();
$client->useApplicationDefaultCredentials();
$client->addScope([
    'https://www.googleapis.com/auth/datastore',
    'https://www.googleapis.com/auth/cloud-platform'
]);
// $client->authorize();

print_r($client->fetchAccessTokenWithAssertion());
user_2843250
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