Hello,
My Go application calls several Cloud Functions, and I am writing Unit tests for it. The documentation seems to recommend using the following [1]
func makeGetRequest(w io.Writer, targetURL string, audience string) error {
// For Cloud Functions, endpoint (`serviceUrl`) and `audience` are the same.
// Example `audience` value (Cloud Functions): https://<PROJECT>-<REGION>-<PROJECT_ID>.cloudfunctions.net/myFunction
// (`targetURL` and `audience` will differ for GET parameters)
ctx := context.Background()
// client is a http.Client that automatically adds an "Authorization" header
// to any requests made.
client, err := idtoken.NewClient(ctx, audience)
if err != nil {
return fmt.Errorf("idtoken.NewClient: %v", err)
}
resp, err := client.Get(targetURL)
if err != nil {
return fmt.Errorf("client.Get: %v", err)
}
defer resp.Body.Close()
if _, err := io.Copy(w, resp.Body); err != nil {
return fmt.Errorf("io.Copy: %v", err)
}
return nil
}
I can mock the targetUrl rather easily by using httptest to generate a testServer and use its URL property:
testServer = httptest.NewServer(http.HandlerFunc(MockHandlerFunc))
MockRegisterTriggerUrls(testServer.URL)
But using the same URL for the audience gives the following error:
idtoken: unsupported credentials type
Is there any workaround for this?
[1] https://cloud.google.com/functions/docs/securing/authenticating#generating_tokens_programmatically