Add models, remove cookie auth

get_current_user returns a User model instead of a dict.
using cookies for Hub auth is deprecated, so removed
that option and refactored get_current_user

examples/service-fastapi/app/security.py

@@ -4,83 +4,55 @@ from fastapi import HTTPException
 from fastapi import Security
 from fastapi import status
 from fastapi.security import OAuth2AuthorizationCodeBearer
-from fastapi.security.api_key import APIKeyCookie
 from fastapi.security.api_key import APIKeyQuery
 
 from .client import get_client
+from .models import User
 
-### For authenticated endpoints, we want to get auth from one of three ways
-### 1. "token" in the url params
-### 2. "jupyterhub-services" cookie (or config via env)
-### 3. Authorization Bearer header (with oauth to Hub support)
+### Endpoints can require authentication using Depends(get_current_user)
+### get_current_user will look for a token in url params or
+### Authorization: bearer token (header).
+### Hub technically supports cookie auth too, but it is deprecated so
+### not being included here.
 auth_by_param = APIKeyQuery(name="token", auto_error=False)
 
-COOKIE_NAME = os.getenv("JUPYTERHUB_COOKIE_NAME", "jupyterhub-services")
-auth_by_cookie = APIKeyCookie(name=COOKIE_NAME, auto_error=False)
-
-if "PUBLIC_HOST" in os.environ:
-    ### When running in Docker or maybe other infrastructure,
-    ### JUPYTERHUB_API_URL is "http://jupyterhub" but we need to give
-    ### clients (swagger webpage) a link to the public url
-    auth_url = os.environ["PUBLIC_HOST"] + "/hub/api/oauth2/authorize"
-else:
-    auth_url = os.environ["JUPYTERHUB_API_URL"] + "/oauth2/authorize"
+auth_url = os.environ["PUBLIC_HOST"] + "/hub/api/oauth2/authorize"
 auth_by_header = OAuth2AuthorizationCodeBearer(
     authorizationUrl=auth_url, tokenUrl="get_token", auto_error=False
 )
-### ^^ For Oauth in the Swagger webpage, we set the authorizationUrl
-### to the Hub /oauth2/authorize endpoint, so browser does a GET there and
-### receives a 'code' in return.  Then the browser does a POST to our
-### internal /get_token endpoint with that code, and our server subsequently
-### POSTs to Hub /oauth2/token to get/return an acecss_token.
-### The reason for the double POST is that the client (swagger ui) doesn't have
-### the client_secret (JUPYTERHUB_API_TOKEN), but our server does.
+### ^^ The flow for OAuth2 in Swagger is that the "authorize" button
+### will redirect user (browser) to "auth_url", which is the Hub login page.
+### After logging in, the browser will POST to our internal /get_token endpoint
+### with the auth code.  That endpoint POST's to Hub /oauth2/token with
+### our client_secret (JUPYTERHUB_API_TOKEN) and that code to get an
+### access_token, which it returns to browser, which places in Authorization header.
 
-### For consideration: build a pydantic User model
-### instead of just returning the dict from Hub api?
-### Also: optimize performance with a cache instead of
+### For consideration: optimize performance with a cache instead of
 ### always hitting the Hub api?
 async def get_current_user(
-    auth_by_cookie: str = Security(auth_by_cookie),
     auth_by_param: str = Security(auth_by_param),
     auth_by_header: str = Security(auth_by_header),
 ):
-    ### Note all three Security functions are auto_error=False,
-    ### meaning if the scheme (header/cookie/param) isn't present
-    ### then they return None.
-    ### The cookie can be tricky.  Navigating to the Hub login
-    ### page but not logging in still sets a cookie, but
-    ### Hub API returns a 404 if you query that cookie
-    user = None
-    if auth_by_param is not None or auth_by_header is not None:
-        token = auth_by_param or auth_by_header
-        async with get_client() as client:
-            endpoint = "/authorizations/token/%s" % token
-            resp = await client.get(endpoint)
-            if resp.is_error:
-                raise HTTPException(
-                    resp.status_code,
-                    detail={
-                        "msg": "Error getting user info from token",
-                        "request_url": str(resp.request.url),
-                        "token": token,
-                        "hub_response": resp.json(),
-                    },
-                )
-            else:
-                user = resp.json()
-
-    elif auth_by_cookie is not None:
-        async with get_client() as client:
-            endpoint = "/authorizations/cookie/%s/%s" % (COOKIE_NAME, auth_by_cookie)
-            resp = await client.get(endpoint)
-            if not resp.is_error:
-                user = resp.json()
-
-    if user is None:
+    token = auth_by_param or auth_by_header
+    if token is None:
         raise HTTPException(
             status.HTTP_401_UNAUTHORIZED,
-            detail="Must login with token parameter, cookie, or header",
+            detail="Must login with token parameter or Authorization bearer header",
         )
-    else:
-        return user
+
+    async with get_client() as client:
+        endpoint = "/authorizations/token/%s" % token
+        resp = await client.get(endpoint)
+        if resp.is_error:
+            raise HTTPException(
+                status.HTTP_400_BAD_REQUEST,
+                detail={
+                    "msg": "Error getting user info from token",
+                    "request_url": str(resp.request.url),
+                    "token": token,
+                    "response_code": resp.status_code,
+                    "hub_response": resp.json(),
+                },
+            )
+    user = User(**resp.json())
+    return user