Cant access Firestore documents from PHP scripts with API key - php

Question

I am new to Firebase/Firestore. I have created 2 projects that access the same data in Firestore.
One is in android and the other a web app in php. I am able to access data in android app but in PHP app
i had to create an API key in the credentials page. I want to use Firestore on trial basis initially but am not able to access the documents . It gives an error
Fatal error: Uncaught RuntimeException: Credentials fetcher does not implement Google\Auth\UpdateMetadataInterface in C:\xampp\htdocs\FirestoreProject\vendor\google\auth\src\FetchAuthTokenCache.php:190 Stack trace: #0 C:\xampp\htdocs\FirestoreProject\vendor\google\gax\src\CredentialsWrapper.php(197): Google\Auth\FetchAuthTokenCache->updateMetadata(Array, 'https://firesto...') #1 [internal function]: Google\ApiCore\CredentialsWrapper->Google\ApiCore{closure}(Object(stdClass)) #2 C:\xampp\htdocs\FirestoreProject\vendor\grpc\grpc\src\lib\ServerStreamingCall.php(44): Grpc\Call->startBatch(Array) #3 C:\xampp\htdocs\FirestoreProject\vendor\grpc\grpc\src\lib\BaseStub.php(364): Grpc\ServerStreamingCall->start(Object(Google\Cloud\Firestore\V1\BatchGetDocumentsRequest), Array, Array) #4 C:\xampp\htdocs\FirestoreProject\vendor\grpc\grpc\src\lib\BaseStub.php(589): Grpc\BaseStub->Grpc{closure}('/google.firesto...', Object(Google\Cloud\Firestore\V1\BatchGetDocumentsRequest), Array, Array, Array) #5 C:\xampp\htdocs\FirestoreProject\ve in C:\xampp\htdocs\FirestoreProject\vendor\google\auth\src\FetchAuthTokenCache.php on line 190
I have installed composer and updated the dependencies and gRPC.
My index.php file reads
<?php
session_start();
require_once 'vendor/autoload.php';
require_once "Firestore.php";
$apiKey = 'WWWWWWWWWWWWWWWWWWWWWW';
$url ='https://console.firebase.google.com/project/prject-ID/firestore?
key=Aasdads';
$fs = new Firestore('Users');
print_r($fs->getDocument('9427349073'));
return;
?>
My Firestore.php file reads
<?php
use Google\Cloud\Core\Exception\GoogleException;
use Google\Cloud\Firestore\FirestoreClient;
class Firestore
{
protected $db;
protected $name; // $name is name of collection
public function __construct(string $collection) // $collection =
// 'Users'
{
if (isset($this)) {
try {
$this->db = new FirestoreClient([
'projectId' => 'XXXXXXXXXXXXXXXXXXX'
]);
$this->name = $collection;
} catch (GoogleException $e) {
print_r($e->getMessage());
}
}else{
}
}
public function getDocument(string $name) // $name is name of document
{
return $this->db->collection($this->name)->document($name)-
>snapshot()->data();
}
}
?>
I tried activating the Credentials Page but they are asking for Credit card for billing to start trial , which i dont have. Cant we test the database without activating the Credentials? What is the difference between testing and trial basis usage ?
Please help
regards
Sanjish
I have made a test.php file after creating a service account and pointing to the key.json file on command prompt using set GOOGLE_APPLICATION_CREDENTIALS
<?php
require_once 'vendor/autoload.php';
session_start();
use Google\Cloud\Firestore\FirestoreClient;
initialize();
function initialize()
{
// Create the Cloud Firestore client
$db = new FirestoreClient([
'projectId' => 'Valbhai-xxx'
]);
$usersRef = $db->collection('Users'); // This works
$snapshot = $usersRef->documents(); // This does not work , gives
// the same error
foreach ($snapshot as $user) {
printf('User: %s' . PHP_EOL, $user->client_name());
}
}
?>

Answer 1

I reproduced your issue on my computer and I noticed that this is because PHP is ignoring the environment variable GOOGLE_APPLICATION_CREDENTIALS, because this is not defined for the user Apache(or httpd) in order to fix this I modified the initialization by using this code block
$db = new FirestoreClient([
'keyFilePath' => '/path/to/credentials.json',
'projectId' => 'my-project-id'
]);
With keyFilePath (this parameter is documented here), Firestore library going to search the GCP credentials using the string of the path instead the environment variable