Custom redirect location after logout

[benparsons]

Is your suggestion related to a problem? Please describe.
When logging out of Element, it should be possible to set a custom location to redirect to.

Describe the solution you'd like
I would like to be able to set a web location in config.json, and have the webapp redirect there on logout.

Describe alternatives you've considered
Hitting an endpoint during the logout flow could also work

Additional context
This is to support users with custom SSO setups.

[jryans]

I do imagine we'll want something like this, but I think we'll need input from several SSO deployments before it's clear what shape it should take. For example, I think it would be surprising to a user if they are redirected to an SSO portal when logging out of Element.

[jonathanmmm]

I do imagine we'll want something like this, but I think we'll need input from several SSO deployments before it's clear what shape it should take. For example, I think it would be surprising to a user if they are redirected to an SSO portal when logging out of Element.

For keycloak you could use something like this:
https://keycloak.example.com/auth/realms/MY_REALM/protocol/openid-connect/logout?redirect_uri=https%3A%2F%2Felement-web.example.com%2F it would logout of keycloak and keycloak would redirect to https://element-web.example.com

Even with landing on an SSO portal, that would be the choice of the one deploying element web.

[t3chguy]

Otherwise Element Desktops won't be affected by a EW config.json

[t3chguy]

https://github.com/vector-im/element-web/blob/develop/docs/config.md#sso-setup logout_redirect_url