feat(xo-server-auth-saml): allow customizing callback URL (#6278)

This will allow you to enter the full path of the callback URL. As stated in issue #6108 the SAML plugin wont work with Azure AD as the callback URL needs to be HTTPS. This was solved by @jens-rabe

CHANGELOG.unreleased.md

@@ -29,5 +29,6 @@
 
 - @xen-orchestra/mixins patch
 - xo-web patch
+- xo-server-auth-saml minor 
 
 <!--packages-end-->

packages/xo-server-auth-saml/src/index.js

@@ -11,6 +11,11 @@ export const configurationSchema = {
     'Important: When registering your instance to your identity provider, you must configure its callback URL to `https://<xo.company.net>/signin/saml/callback`!',
   type: 'object',
   properties: {
+    callbackUrl: {
+      title: 'callbackUrl',
+      description: "the callback URL",
+      type: 'string',
+    },
     cert: {
       title: 'Certificate',
       description: "Copy/paste the identity provider's certificate",
@@ -60,10 +65,9 @@ class AuthSamlXoPlugin {
     this._conf = {
       ...this._strategyOptions,
       ...DEFAULTS,
-      ...conf,
-
-      // must match the callback URL
       path: '/signin/saml/callback',
+
+      ...conf,
     }
 
     if (loaded) {