feat(auth): add universe domain support to idtoken #11059
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🤖 I have created a release *beep* *boop* --- ## [0.14.0](https://github.com/googleapis/google-cloud-go/compare/auth/v0.13.0...auth/v0.14.0) (2025-01-08) ### Features * **auth:** Add universe domain support to idtoken ([#11059](https://github.com/googleapis/google-cloud-go/issues/11059)) ([72add7e](https://github.com/googleapis/google-cloud-go/commit/72add7e9f8f455af695e8ef79212a4bd3122fb3a)) ### Bug Fixes * **auth/oauth2adapt:** Update golang.org/x/net to v0.33.0 ([e9b0b69](https://github.com/googleapis/google-cloud-go/commit/e9b0b69644ea5b276cacff0a707e8a5e87efafc9)) * **auth:** Fix copy of delegates in impersonate.NewIDTokenCredentials ([#11386](https://github.com/googleapis/google-cloud-go/issues/11386)) ([ff7ef8e](https://github.com/googleapis/google-cloud-go/commit/ff7ef8e7ade7171bce3e4f30ff10a2e9f6c27ca0)), refs [#11379](https://github.com/googleapis/google-cloud-go/issues/11379) * **auth:** Update golang.org/x/net to v0.33.0 ([e9b0b69](https://github.com/googleapis/google-cloud-go/commit/e9b0b69644ea5b276cacff0a707e8a5e87efafc9)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).
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Summary
IdToken flow can be done in two ways: 1) OAuth2 server calls or 2) IAM service calls. The majority of implementations went with the OAuth2 server calls. In non-GDU environments, however, there is no OAuth2 server, so the IAM implementation must be used. This is enabled as follows:
impersonatedIDTokenProvider.Tokeninauth/credentials/impersonate/idtoken.gotoIDTokenIAMOptions.Tokeninauth/credentials/internal/impersonate/idtoken.goto enable reuse inauth/credentials/idtoken/iam.go.formatIAMServiceAccountNameinauth/credentials/impersonate/impersonate.gotoFormatIAMServiceAccountResourceinauth/internal/internal.go, for reuse.auth/credentials/idtoken/file.gointroduce a conditional (resolveUniverseDomain(f) == internal.DefaultUniverseDomain) which if true sustains the existing behavior (auth.New2LOTokenProvider) and if false introduces the new non-GDU behavior inIDTokenIAMOptions.TokenNote that to use the IAM endpoint in a non-GDU environment, the service account must have the
iam.serviceAccountTokenCreatorrole because the service account is not only the target service account, but also the caller; the Oauth2 endpoint doesn’t need this.