Redirect with query params after oauth (#7034)

* Redirect with query params after oauth

* add changeset

* fix redirect

* align online and offline

* location

* Update gradio/oauth.py

Co-authored-by: Abubakar Abid <abubakar@huggingface.co>

* Update gradio/oauth.py

Co-authored-by: Abubakar Abid <abubakar@huggingface.co>

---------

Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
Co-authored-by: Abubakar Abid <abubakar@huggingface.co>

.changeset/sweet-doodles-cheer.md

@@ -0,0 +1,5 @@
+---
+"gradio": minor
+---
+
+feat:Redirect with query params after oauth

gradio/components/login_button.py

@@ -104,13 +104,15 @@ def _check_login_status(self, request: Request) -> LoginButton:
 _js_handle_redirect = """
 (buttonValue) => {
     if (buttonValue === BUTTON_DEFAULT_VALUE) {
+        url = '/login/huggingface' + window.location.search;
         if ( window !== window.parent ) {
-            window.open('/login/huggingface', '_blank');
+            window.open(url, '_blank');
         } else {
-            window.location.assign('/login/huggingface');
+            window.location.assign(url);
         }
     } else {
-        window.location.assign('/logout');
+        url = '/logout' + window.location.search
+        window.location.assign(url);
     }
 }
 """

gradio/oauth.py

@@ -3,6 +3,7 @@
 import hashlib
 import os
 import typing
+import urllib.parse
 import warnings
 from dataclasses import dataclass, field
 
@@ -87,24 +88,22 @@ def _add_oauth_routes(app: fastapi.FastAPI) -> None:
     @app.get("/login/huggingface")
     async def oauth_login(request: fastapi.Request):
         """Endpoint that redirects to HF OAuth page."""
-        redirect_uri = str(request.url_for("oauth_redirect_callback"))
-        if ".hf.space" in redirect_uri:
-            # In Space, FastAPI redirect as http but we want https
-            redirect_uri = redirect_uri.replace("http://", "https://")
+        # Define target (where to redirect after login)
+        redirect_uri = _generate_redirect_uri(request)
         return await oauth.huggingface.authorize_redirect(request, redirect_uri)  # type: ignore
 
     @app.get("/login/callback")
     async def oauth_redirect_callback(request: fastapi.Request) -> RedirectResponse:
         """Endpoint that handles the OAuth callback."""
         oauth_info = await oauth.huggingface.authorize_access_token(request)  # type: ignore
         request.session["oauth_info"] = oauth_info
-        return RedirectResponse("/")
+        return _redirect_to_target(request)
 
     @app.get("/logout")
     async def oauth_logout(request: fastapi.Request) -> RedirectResponse:
         """Endpoint that logs out the user (e.g. delete cookie session)."""
         request.session.pop("oauth_info", None)
-        return RedirectResponse("/")
+        return _redirect_to_target(request)
 
 
 def _add_mocked_oauth_routes(app: fastapi.FastAPI) -> None:
@@ -124,19 +123,49 @@ def _add_mocked_oauth_routes(app: fastapi.FastAPI) -> None:
     @app.get("/login/huggingface")
     async def oauth_login(request: fastapi.Request):
         """Fake endpoint that redirects to HF OAuth page."""
-        return RedirectResponse("/login/callback")
+        # Define target (where to redirect after login)
+        redirect_uri = _generate_redirect_uri(request)
+        return RedirectResponse(
+            "/login/callback?" + urllib.parse.urlencode({"_target_url": redirect_uri})
+        )
 
     @app.get("/login/callback")
     async def oauth_redirect_callback(request: fastapi.Request) -> RedirectResponse:
         """Endpoint that handles the OAuth callback."""
         request.session["oauth_info"] = mocked_oauth_info
-        return RedirectResponse("/")
+        return _redirect_to_target(request)
 
     @app.get("/logout")
     async def oauth_logout(request: fastapi.Request) -> RedirectResponse:
         """Endpoint that logs out the user (e.g. delete cookie session)."""
         request.session.pop("oauth_info", None)
-        return RedirectResponse("/")
+        logout_url = str(request.url).replace("/logout", "/")  # preserve query params
+        return RedirectResponse(url=logout_url)
+
+
+def _generate_redirect_uri(request: fastapi.Request) -> str:
+    if "_target_url" in request.query_params:
+        # if `_target_url` already in query params => respect it
+        target = request.query_params["_target_url"]
+    else:
+        # otherwise => keep query params
+        target = "/?" + urllib.parse.urlencode(request.query_params)
+
+    redirect_uri = request.url_for("oauth_redirect_callback").include_query_params(
+        _target_url=target
+    )
+    redirect_uri_as_str = str(redirect_uri)
+    if redirect_uri.netloc.endswith(".hf.space"):
+        # In Space, FastAPI redirect as http but we want https
+        redirect_uri_as_str = redirect_uri_as_str.replace("http://", "https://")
+    return redirect_uri_as_str
+
+
+def _redirect_to_target(
+    request: fastapi.Request, default_target: str = "/"
+) -> RedirectResponse:
+    target = request.query_params.get("_target_url", default_target)
+    return RedirectResponse(target)
 
 
 @dataclass