UI Improvements (#7)

* Initial version with UI templates

* Implement basic screens

* Linting & bump to 0.3.0

* Tick off some TODOs

custom_components/auth_oidc/endpoints/callback.py

@@ -4,7 +4,7 @@ from homeassistant.components.http import HomeAssistantView
 from aiohttp import web
 from ..oidc_client import OIDCClient
 from ..provider import OpenIDAuthProvider
-from ..helpers import get_url
+from ..helpers import get_url, get_view
 
 PATH = "/auth/oidc/callback"
 
@@ -30,21 +30,29 @@ class OIDCCallbackView(HomeAssistantView):
         state = params.get("state")
 
         if not (code and state):
-            return web.Response(
-                headers={"content-type": "text/html"},
-                text="<h1>Error</h1><p>Missing code or state parameter</p>",
+            view_html = await get_view(
+                "error",
+                {
+                    "error": "Missing code or state parameter.",
+                    "link": get_url("/auth/oidc/redirect"),
+                },
             )
+            return web.Response(text=view_html, content_type="text/html")
 
         redirect_uri = get_url("/auth/oidc/callback")
         user_details = await self.oidc_client.async_complete_token_flow(
             redirect_uri, code, state
         )
         if user_details is None:
-            return web.Response(
-                headers={"content-type": "text/html"},
-                text="<h1>Error</h1><p>Failed to get user details, see console.</p>",
+            view_html = await get_view(
+                "error",
+                {
+                    "error": "Failed to get user details, "
+                    + "see Home Assistant logs for more information.",
+                    "link": get_url("/auth/oidc/redirect"),
+                },
             )
+            return web.Response(text=view_html, content_type="text/html")
 
         code = await self.oidc_provider.async_save_user_info(user_details)
-
         return web.HTTPFound(get_url("/auth/oidc/finish?code=" + code))