Support SP-Initiated workflow

[distortedsignal]

Investigate and implement an SP-Initiated workflow.

[rbmcnicholas]

@distortedsignal can you elaborate on this? Is SP-initiated SAML not supported right now? While trying to get SP-initiated SAML setup, I see the 302 Redirect occurring from the SP to the IdP, however, the Redirect does not have the SAMLRequest/AuthNRequest attached.

Is SP-initiated SAML in a half-working state at the moment?

[distortedsignal]

@rbmcnicholas I think you've got it right. It "works"... kinda. If your IdP is being really nice, this feature works. However, if your IdP expects you to provide a payload, you will not be able to authenticate in an SP initiated fashion. I think this is doable, but my work (specifically, my 9-5) is currently on other projects. I've got this in the back of my brain, but I don't know when I'll get to it.

[mnouh]

@distortedsignal Our IdP is not being very nice. It seems that the library is not generating the SAMLRequest query parameter in the redirect request.

Do you know what is left and missing to make this functional? I can look to help with this.

[Snowned0425]

I know this is very old, but I just started looking at this today, and I am blocked by this same issue. We can't do any sort of auth with our IdP for the same reason. Thanks.