feat: redirect url takes base url from client for proxy use

Author: cavefire

custom_components/openid/authorize.js

@@ -25,8 +25,10 @@ window.fetch = async (...args) => {
     const urlParams = new URLSearchParams(window.location.search);
     const clientId = encodeURIComponent(urlParams.get('client_id'));
     const redirectUri = encodeURIComponent(urlParams.get('redirect_uri'));
+    const baseUrl = window.location.origin;
 
-    window.location.href = `/auth/openid/authorize?client_id=${clientId}&redirect_uri=${redirectUri}`;
+    const encodedUrl = encodeURIComponent(`/auth/openid/authorize?client_id=${clientId}&redirect_uri=${redirectUri}&base_url=${baseUrl}`);
+    window.location.href = decodeURIComponent(encodedUrl);
   };
 
   listNode.appendChild(listItemNode);

custom_components/openid/views.py

@@ -47,8 +47,8 @@ async def get(self, request: Request) -> Response:
         state = secrets.token_urlsafe(24)
 
         params = request.rel_url.query
-
-        redirect_uri = str(request.url.with_path("/auth/openid/callback"))
+        base_url = params.get("base_url", "")
+        redirect_uri = str(URL(base_url).with_path("/auth/openid/callback"))
 
         self.hass.data["_openid_state"][state] = params