Add an option to customize ServerRedirectStrategy in the OAuth2AuthorizationRequestRedirectWebFilter

[igorbolic]

It would be nice to be able to customize the redirect strategy within OAuth2AuthorizationRequestRedirectWebFilter, so that we are able to return to the client e.g. HTTP Status 200 OK with redirect URL in the response payload, instead of the default behavior of HTTP Status 302 Found with Location header containing redirect URL.

Our FE is SPA and BE is Spring Boot application. The FE uses XMLHttpRequests client to retrieve the redirect URL from our BE service for the OAuth authorization flow.
The current OAuth2AuthorizationRequestRedirectWebFilter's response causes the FE client library to automatically follow Location URL.
Sending the response as HTTP Status 200 OK and having redirect URL as part of the payload via custom ServerRedirectStrategy, would allow us inform the FE client of the redirect URL and use the value to send the user to the OAuth providers page for authorization.

ATM we have a custom implementation of OAuth2AuthorizationRequestRedirectWebFilter, where we have changed only the ServerRedirectStrategy to achieve the above mentioned behavior.

[rwinch]

Thanks for reaching out @igorbolic Would you be interested in submitting a pull request for this?

[igorbolic]

Of course, I'll try to find some time this week... Thanks for quick reply 👍

[igorbolic]

@rwinch I've created a PR #11387 to resolve this issue