feat: Add relay state for SAML SSO (#12597)

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/controllers/devise_overrides/omniauth_callbacks_controller.rb

@@ -19,6 +19,19 @@ class DeviseOverrides::OmniauthCallbacksController < DeviseTokenAuth::OmniauthCa
     redirect_to login_page_url(email: encoded_email, sso_auth_token: @resource.generate_sso_auth_token)
   end
 
+  def sign_in_user_on_mobile
+    @resource.skip_confirmation! if confirmable_enabled?
+
+    # once the resource is found and verified
+    # we can just send them to the login page again with the SSO params
+    # that will log them in
+    encoded_email = ERB::Util.url_encode(@resource.email)
+    params = { email: encoded_email, sso_auth_token: @resource.generate_sso_auth_token }.to_query
+
+    mobile_deep_link_base = GlobalConfigService.load('MOBILE_DEEP_LINK_BASE', 'chatwootapp')
+    redirect_to "#{mobile_deep_link_base}://auth/saml?#{params}", allow_other_host: true
+  end
+
   def sign_up_user
     return redirect_to login_page_url(error: 'no-account-found') unless account_signup_allowed?
     return redirect_to login_page_url(error: 'business-account-only') unless validate_signup_email_is_business_domain?