[FIX] auth_oauth: fragment_to_query_string return

Use the `fragment_to_query_string` decorator before the `route`
decorator on a controller endpoint. Traceback when the endpoint is
called as a `str` object is not a `Response` object.

Since httpocalypse it is advised that all decorators used with http-type
controllers return a Response. This makes it possible to decorate the
endpoint in any order, even before `@route`.

    # Preferred
    @route(...)
    @fragment_to_query_string
    def endpoint(...):
        ...

    # This work
    @fragment_to_query_string
    @route(...)
    def endpoint(...):
        ...

X-original-commit: 4a879cb4a395ad5ef47384937fcc383acdb3e431
Part-of: odoo/odoo#110034

addons/auth_oauth/controllers/main.py

@@ -12,7 +12,7 @@ from werkzeug.exceptions import BadRequest
 
 from odoo import api, http, SUPERUSER_ID, _
 from odoo.exceptions import AccessDenied
-from odoo.http import request
+from odoo.http import request, Response
 from odoo import registry as registry_get
 
 from odoo.addons.auth_signup.controllers.main import AuthSignupHome as Home
@@ -30,7 +30,7 @@ def fragment_to_query_string(func):
     def wrapper(self, *a, **kw):
         kw.pop('debug', False)
         if not kw:
-            return """<html><head><script>
+            return Response("""<html><head><script>
                 var l = window.location;
                 var q = l.hash.substring(1);
                 var r = l.pathname + l.search;
@@ -42,7 +42,7 @@ def fragment_to_query_string(func):
                     r = '/';
                 }
                 window.location = r;
-            </script></head><body></body></html>"""
+            </script></head><body></body></html>""")
         return func(self, *a, **kw)
     return wrapper