OIDC - support IdP logout (#670)

* OIDC - support IdP logout

Signed-off-by: Michael Tupitsyn <michael.tupitsyn@gmail.com>

* Add support of logout_idp_session parameter

Signed-off-by: Michael Tupitsyn <michael.tupitsyn@gmail.com>

* Fix merge conflict issue

Signed-off-by: Michael Tupitsyn <michael.tupitsyn@gmail.com>

* Restore original package-lock.json

Signed-off-by: Michael Tupitsyn <michael.tupitsyn@gmail.com>

* Cleanup

---------

Signed-off-by: Michael Tupitsyn <michael.tupitsyn@gmail.com>
Co-authored-by: Christoph Haas <christoph.h@sprinternet.at>

frontend/src/stores/auth.js

@@ -108,12 +108,19 @@ export const authStore = defineStore('auth',{
             this.setUserInfo(null)
             this.ResetReturnUrl() // just to be sure^^
 
+            let logoutResponse = null
             try {
-                await apiWrapper.post(`/auth/logout`)
+                logoutResponse = await apiWrapper.post(`/auth/logout`)
             } catch (e) {
                 console.log("Logout request failed:", e)
             }
 
+            const redirectUrl = logoutResponse?.RedirectUrl
+            if (redirectUrl) {
+                window.location.href = redirectUrl
+                return
+            }
+
             notify({
                 title: "Logged Out",
                 text: "Logout successful!",