import org.springframework.security.core.context.SecurityContextHolder
import org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler
import org.springframework.stereotype.Controller
import org.springframework.web.bind.annotation.GetMapping
import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse

@Controller
class LogoutController {

    @GetMapping("/logout")
    fun logout(request: HttpServletRequest, response: HttpServletResponse): String {
        val auth = SecurityContextHolder.getContext().authentication
        if (auth != null) {
            SecurityContextLogoutHandler().logout(request, response, auth)
        }
        return "redirect:${oauthProviderLogoutUrl}"
    }

    companion object {
        const val oauthProviderLogoutUrl = "https://oauth-provider.com/logout"
    }
}