Use CredentialsLoader::makeCredentials(). Another option is to specify the service account in your code. Use the Environment variable method which will be checked first. If you need Identity Tokens, do not use Well Know File (gcloud auth application-default login). If the CLI is not installed or you have not authenticated with the application-default option, then that method will not find the file and will skip to the next method. The only method that requires the CLI to be installed is Well Known File. Compute Engine: Access and Identity Tokens.ĪDC is implemented by ApplicationDefaultCredentials. App Engine Standard: Access and Identity Tokens.Environment: Access and Identity Tokens.Type of tokens created by the above methods: Compute Engine: Service Account assigned to the service.App Engine Standard: Service Account assigned to the service.The source of credentials created by the above methods: This includes App Engine Flexible, Cloud Functions, and Cloud Run. App Engine Standard: App Identity Service.Locations for credentials are searched in the following order: If all of the supported methods are not available or one is configured incorrectly, a DomainException exception is thrown. The Google Cloud PHP SDK google/auth version 1.16 searches various locations to create credentials from. Create a Guzzle HTTP Client to call a Cloud Run service that requires an OIDC Identity Token from an identity authorized with the roles/run.invoker role.Create a Guzzle HTTP Client to call the Compute Engine Aggregate List Instance API and display all instances in a project.In this article, we will use the SDK to create several example programs: The default lifetime is 3,600 seconds (one hour). In summary, a Refresh Token is used to request a new Access Token or Identity Token as both have a lifetime. Since the Google SDKs manage the refresh of both Access Tokens and Identity Tokens, this article ignores Refresh Tokens. OIDC is a layer above OAuth that generates Identity Tokens. OAuth generates Access Tokens and Refresh Tokens. Google also supports API Keys which I do not cover. In this article, I discuss OAuth 2 and OIDC credentials. For example, authenticate with a user identity and then impersonate a service account identity. You can also combine both identities to obtain impersonated credentials. The first is a user identity, the second is a service account identity. There are two types of identities that credentials can be created from. The Google Cloud PHP SDK will search specific locations and use the first valid method to create credentials. ADC is a strategy to locate sources that contain secrets/key material to create credentials. Google Cloud Application Default Credentials (ADC) are not credentials. This article is more technical and includes details directly from the Google Cloud google/auth PHP SDK with SDK source code links. I wrote another article on ADC that includes Python examples. This article will cover Google Cloud Application Default Credentials (ADC) and how to create credentials using various methods in PHP.
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