Implement initial flow (#2)

custom_components/auth_oidc/endpoints/finish.py

@@ -0,0 +1,24 @@
+from aiohttp import web
+from homeassistant.components.http import HomeAssistantView
+import logging
+
+PATH = "/auth/oidc/finish"
+
+_LOGGER = logging.getLogger(__name__)
+
+class OIDCFinishView(HomeAssistantView):
+    """OIDC Plugin Finish View."""
+
+    requires_auth = False
+    url = PATH
+    name = "auth:oidc:finish"
+
+    async def get(self, request: web.Request) -> web.Response:
+        """Receive response."""
+
+        code = request.query.get("code", "FAIL")
+
+        return web.Response(
+            headers={"content-type": "text/html"},
+            text=f"<h1>Done!</h1><p>Your code is: <b>{code}</b></p><p>Please return to the Home Assistant login screen (or your mobile app) and fill in this code into the single login field. It should be visible if you select 'Login with OpenID Connect (SSO)'.</p>",
+        )