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AUTHENTICATION.md

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Authentication

The recommended way to authenticate to the Google Cloud PHP library is to use Application Default Credentials (ADC), which discovers your credentials automatically, based on the environment where your code is running. To review all of your authentication options see Credential Lookup.

For more information about authentication at Google, see the authentication guide. Specific instructions and environment variables for each individual service are linked from the README documents listed below for each service.

Credential Lookup

The Google Cloud PHP library provides several mechanisms to configure your system without providing Service Account Credentials directly in code.

Credentials are discovered in the following order:

  1. Credentials specified in code
  2. Path to credential file in environment variables
  3. Credentials specified in a local ADC file
  4. Credentials from an attached service account (for code running on Google Cloud Platform)

Google Cloud Platform environments

While running on Google Cloud Platform environments such as Google Compute Engine, Google App Engine and Google Kubernetes Engine, no extra work is needed. The Credentials and are discovered automatically from the attached service account. Code should be written as if already authenticated.

For more information, see Set up ADC for Google Cloud services.

Environment Variables

NOTE: This library uses getenv, so if your environemnt variables are set in PHP, they must use putenv,

putenv("GOOGLE_APPLICATION_CREDENTIALS=" . __DIR__ . '/your-credentials-file.json');

The Credentials JSON can be placed in environment variables instead of declaring them directly in code.

Here are the environment variables that Google Cloud PHP checks for credentials:

  1. GOOGLE_APPLICATION_CREDENTIALS - Path to JSON file

The JSON file can contain credentials created for workload identity federation, workforce identity federation, or a service account key.

Note: Service account keys are a security risk if not managed correctly. You should choose a more secure alternative to service account keys whenever possible.

Project ID detection

Some libraries support setting up the project ID via the GOOGLE_CLOUD_PROJECT environment variable.

putenv("GOOGLE_CLOUD_PROJECT=<YOUR_PROJECT_ID>");

The libraries that support this environment variable are:

  • Bigtable
  • PubSub
  • Storage
  • Spanner
  • BigQuery
  • Datastore
  • Firestore
  • Debugger
  • Logging
  • Trace
  • Translate

Client Authentication

Each Google Cloud PHP client may be authenticated in code when creating a client library instance.

Most clients use the credentials option for providing credentials as a constructor option:

require 'vendor/autoload.php';

use Google\Cloud\VideoIntelligence\V1\VideoIntelligenceServiceClient;

// Authenticating with keyfile data.
$video = new VideoIntelligenceServiceClient([
    'credentials' => json_decode(file_get_contents('/path/to/credential-file.json'), true)
]);

// Authenticating with a keyfile path.
$video = new VideoIntelligenceServiceClient([
    'credentials' => '/path/to/credential-file.json'
]);

Local ADC file

This option allows for an easy way to authenticate in a local environment during development. If credentials are not provided in code or in environment variables, then your user credentials can be discovered from your local ADC file.

To set up a local ADC file:

  1. Download, install, and initialize the Cloud SDK
  2. Create your local ADC file:
gcloud auth application-default login
  1. Write code as if already authenticated.

NOTE: Because this method relies on your user credentials, it is not recommended for running in production.

For more information about setting up authentication for a local development environment, see Set up Application Default Credentials.

Troubleshooting

If you're having trouble authenticating open a Github Issue to get help. Also consider searching or asking questions on StackOverflow.