add whoami-oauth-basic example

implements oauth without inheriting from HubOAuthenticated

should be easier to parse for users with alternate oauth implementations

examples/external-oauth/launch-service-basic.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# the service needs to know:
+# 1. API token
+if [[ -z "${JUPYTERHUB_API_TOKEN}" ]]; then
+    echo 'set API token with export JUPYTERHUB_API_TOKEN=$(openssl rand -hex 32)'
+fi
+
+# 2. oauth client ID
+export JUPYTERHUB_CLIENT_ID='whoami-oauth-client-test'
+# 3. where the Hub is
+export JUPYTERHUB_URL='http://127.0.0.1:8000'
+
+# 4. where to run
+export JUPYTERHUB_SERVICE_URL='http://127.0.0.1:5555'
+
+# launch the service
+exec python3 whoami-oauth-basic.py