Configure redirect_uri for token request

[palantir]

Configure redirect_uri for token request

[bluekeyes]

This sounds like something we can add. I think it hasn't come up before because the existing strategy works as long as any reverse proxies preserve (or set) the Host header, which is the configuration we always use and seems to be common for other users.

I should be able to put something together in a few days or I'm happy to review a PR if you'd like to contribute this.

[steebchen]

Sounds good, in my case I'm using a different URL just for testing purposes, I guess I wouldn't have this problem in prod with a proper setup, but I do in my testing case.

My fix is basically this:

#176

So now I can do this

return oauth2.NewHandler(
	oauth2.GetConfig(config.Config.Github, []string{"user:email"}),
	oauth2.SetRedirectURI(getRedirectURI()),
	// ...
)

However, I'm not sure if this would break existing applications if for some reason the redirectURL would be set already, but I wouldn't know where it would.