[BUG] Flytectl authentication not working with GCP IAP

[gverkes]

Describe the bug

After having set up IAP with Flyte according to https://pypi.org/project/flytekitplugins-identity-aware-proxy/, the flytectl command during flyte authentication seems to fail due to IAP. During the Flyte authentication the initial IAP works fine, but during the callback I get the error: Couldn't get access token due to error: oauth2: cannot fetch token: 401 Unauthorized Response: Invalid IAP credentials: empty token. Connecting through Flytekit or the console works fine.

versions

$ flytectl version
{
  "App": "flytectl",
  "Build": "89efcc62a",
  "Version": "0.9.2",
  "BuildTime": "2024-12-06 10:06:41.50991 +0000 WET m=+0.017617709"
}

flyte-core: 1.13.3

Expected behavior

The proxyCommand provides a token for IAP, that should be properly propagated, such that the Flyte authentication succeeds. Just like Flytekit

Additional context to reproduce

1. Setup Flyte + IAP according to the tutorial on https://pypi.org/project/flytekitplugins-identity-aware-proxy/
2. Set config.yaml to something like (also used for flytekit, which does work):

admin:
  endpoint: dns:///example.com
  insecure: false
  insecureSkipVerify: false
  authType: Pkce
  proxyCommand: ["flyte-iap", "generate-user-id-token", "--desktop_client_id", "xxxxx.apps.googleusercontent.com", "--desktop_client_secret_gcp_secret_name", "flyte-desktop-oauth-client-secret", "--webapp_client_id", "xxxxx.apps.googleusercontent.com", "--project", "project-1"]

3. Try to run something like flytectl get project

Screenshots

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