[macastelaz]

Summary

Automatically syncs the oidc-jwt-1 Workload Identity Pool Provider's static jwksJson in ITWorkloadIdentityFederationTest whenever the integration test service account (it-service-account@gcloud-devel.iam.gserviceaccount.com) rotates keys bi-monthly (java_it_service_account_rotation).

Background

• The 4 mTLS + actor_token Workload Identity Federation tests added in feat(oauth2): support certificate-bound OAuth2 tokens and mTLS rotation for Workload Identity Federation #14781 sign mock OIDC JWTs with it-service-account@gcloud-devel.iam.gserviceaccount.com's private key (GOOGLE_APPLICATION_CREDENTIALS), verified against the oidc-jwt-1 OIDC provider in gcloud-devel.
• When it-service-account rotates keys every two months, the new private_key_id (kid) is not in oidc-jwt-1's static jwksJson, causing STS token exchange to fail with 400 Bad Request: Invalid JWT signature.
• Because ITWorkloadIdentityFederationTest runs authenticated as it-service-account@gcloud-devel.iam.gserviceaccount.com—which already holds roles/iam.workloadIdentityPoolAdmin on gcloud-devel—ensureOidcJwtProviderJwksSynced() checks once per test run whether oidc-jwt-1's jwksJson includes privateKeyId. On the first run after a key rotation, it fetches the service account's live public JWK set (https://www.googleapis.com/service_accounts/v1/jwk/<client_email>) and patches oidc-jwt-1.

[gemini-code-assist]

Code Review

This pull request updates the workload identity federation integration tests to use a static test private key instead of the service account's private key. It modifies the setup script to append this static key to the JWK set retrieved from Google. The review feedback suggests improving the inline Python script in the setup script by adding a timeout and using a context manager for the network request to prevent potential hangs in CI/CD pipelines.

[gemini-code-assist]

Using urllib.request.urlopen without a timeout can cause the script to hang indefinitely if there are network issues, which can block CI/CD pipelines. Additionally, it is recommended to use a context manager (with statement) to ensure the connection/socket is properly closed after reading.

Suggested change

	import json, sys, urllib.request
	url = f"https://www.googleapis.com/service_accounts/v1/jwk/{sys.argv[1]}"
	jwks = json.loads(urllib.request.urlopen(url).read().decode())
	import json, sys, urllib.request
	url = f"https://www.googleapis.com/service_accounts/v1/jwk/{sys.argv[1]}"
	with urllib.request.urlopen(url, timeout=10) as response:
	jwks = json.loads(response.read().decode("utf-8"))