func TokenSource(ctx context.Context, ts oauth2.TokenSource, config *Config) (oauth2.TokenSource, error)
TokenSource returns an impersonated TokenSource configured with the provided config using ts as the base credential provider for making requests.
Config for generating impersonated credentials.
type Config struct {
// Target is the service account to impersonate. Required.
Target string
// Scopes the impersonated credential should have. Required.
Scopes []string
// Delegates are the service accounts in a delegation chain. Each service
// account must be granted roles/iam.serviceAccountTokenCreator on the next
// service account in the chain. Optional.
Delegates []string
}