Use My Home Assistant for OAuth2 redirect callbacks (#72449)

Co-authored-by: Paulus Schoutsen <balloob@gmail.com>

homeassistant/helpers/config_entry_oauth2_flow.py

@@ -37,6 +37,7 @@ DATA_IMPLEMENTATIONS = "oauth2_impl"
 DATA_PROVIDERS = "oauth2_providers"
 AUTH_CALLBACK_PATH = "/auth/external/callback"
 HEADER_FRONTEND_BASE = "HA-Frontend-Base"
+MY_AUTH_CALLBACK_PATH = "https://my.home-assistant.io/redirect/oauth"
 
 CLOCK_OUT_OF_SYNC_MAX_SEC = 20
 
@@ -129,6 +130,9 @@ class LocalOAuth2Implementation(AbstractOAuth2Implementation):
     @property
     def redirect_uri(self) -> str:
         """Return the redirect uri."""
+        if "my" in self.hass.config.components:
+            return MY_AUTH_CALLBACK_PATH
+
         if (req := http.current_request.get()) is None:
             raise RuntimeError("No current request in context")