Adding demo CLI for fetching tokens using the device auth flow

oidc-device-flow/helpers.py

@@ -0,0 +1,86 @@
+import os
+import requests
+import jwt
+import time
+import json
+import webbrowser
+import http.server
+from urllib.parse import urlencode, parse_qs
+
+def get_discovery_document(url):
+    response = requests.get(url)
+    return response.json()
+
+
+def request_device_code(discovery_doc, client_credentials):
+    data={}
+    data.update(client_credentials)
+    data.update({'scope': 'offline_access'  })
+    response = requests.post(
+        discovery_doc["device_authorization_endpoint"], data=data
+    )
+    if response.status_code == 200:
+        return response.json()
+    else:
+        print(f"Failed to obtain device code. Status code: {response.status_code}")
+        print(f"Response content: {response.content}")
+        return None
+
+
+
+def poll_for_access_token(
+    discovery_doc, client_credentials, device_code, interval, timeout
+):
+    payload = {
+        "grant_type": "urn:ietf:params:oauth:grant-type:device_code",
+        "device_code": device_code,
+        "client_id": client_credentials["client_id"]
+    }
+    start_time = time.time()
+    print("\nWaiting for device to be authorized ...")
+    while time.time() - start_time < timeout:
+        response = requests.post(discovery_doc["token_endpoint"], data=payload)
+        if response.status_code == 200:
+            return response.json()
+        elif response.status_code == 400:
+            error = response.json().get("error", "")
+            if error == "authorization_pending":
+                print("Waiting for device to be authorized ...")
+                time.sleep(interval)
+            else:
+                return None
+        else:
+            return None
+
+
+def device_login(discovery_doc, client_credentials):
+    device_code_response = request_device_code(discovery_doc, client_credentials)
+    if device_code_response:
+        verification_uri_complete = device_code_response.get("verification_uri_complete", None)
+        webbrowser.open(verification_uri_complete)
+        if verification_uri_complete:
+            print(
+                f"The following URL has been opened in your browser: {verification_uri_complete}"
+            )
+        else:
+            print(f"Something went wrong")
+
+
+        interval = device_code_response["interval"]
+        timeout = device_code_response["expires_in"]
+        device_login = poll_for_access_token(
+            discovery_doc,
+            client_credentials,
+            device_code_response["device_code"],
+            interval,
+            timeout,
+        )
+        if device_login:
+            print("Device login successfull")
+            return device_login
+        else:
+            print("Failed to obtain an device login")
+            return None
+    else:
+        print("Failed to obtain device code")
+        return None

oidc-device-flow/oidc-cli-example.py

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+from pprint import pprint 
+
+from helpers import (
+    get_discovery_document,
+    device_login,
+)
+
+discovery_doc = get_discovery_document("https://auth.apex.esa.int/realms/apex/.well-known/openid-configuration")
+
+client_credentials ={
+  "client_id": "project-a-catalogue-dev-browser"
+}
+
+response = device_login(discovery_doc, client_credentials)
+
+print("\n\nScopes: %s" % response["scope"])
+
+print("\naccess token ( Expires after %s seconds ):\n-------------------------------------------------------------------------------------------------------------------" % response["expires_in"])
+print(response["access_token"])
+print("-------------------------------------------------------------------------------------------------------------------")
+
+print("\nRefresh token ( Expires after %s seconds ):\n-------------------------------------------------------------------------------------------------------------------" % response["refresh_expires_in"])
+print(response["refresh_token"])
+print("-------------------------------------------------------------------------------------------------------------------\n")