Invalid redirect with callback to absolute URI

[fatal10110]

What you were expecting:
Im using custom routes, passing redirect property to Create component

<Create
      redirect={(resource, id, data) => `/resourceA/<raId1>/resourceB/<rbId2>/resourceC/${id}`}
      mutationOptions={{ meta: { ... } }}
      resource="resourceC"
    >
...
</Create>

Expected to redirect to the absolute uri returned from the callback /resourceA/1/resourceB/2/resourceC/3

What happened instead:
instead I was redirected to /1/resourceB/2/resourceC/3 , according to the code of redirect function from ra-core

            } else if (typeof redirectTo === 'function') {
                const target: To = redirectTo(resource, id, data);
                const absoluteTarget =
                    typeof target === 'string'
                        ? `${basename}/${target}`
                        : {
                              pathname: `${basename}/${target.pathname}`,
                              ...target,
                          };
                navigate(absoluteTarget, {
                    state: { _scrollToTop: true, ...state },
                });
                return;

the result will be <basename>//resourceA/1/resourceB/2/resourceC/3 the double slash is causing the issue I belive, I would expect the check for leading slash before concatination

Environment

• React-admin version: 5.4.3
• Browser: Edge

[fzaninotto]

I want to be sure about the problem you meet:

1. the basename has a trailing slash
2. the redirect target has a leading slash
3. the resulting URI has a double slash

Is it the right description? If so, I don't see a bug. You should either remove the trailing slash from 1 or the leading slash from 2.