Integrate Discourse Connect (SSO)

app/controllers/discourse/sso_controller.rb

@@ -0,0 +1,17 @@
+class Discourse::SsoController < ApplicationController
+  before_action :authenticate_user!
+
+  def connect
+    secret = Setting.discourse_connect_secret
+    sso = DiscourseApi::SingleSignOn.parse(request.query_string, secret)
+    sso.external_id = current_user.id
+    sso.email = current_user.email
+    sso.username = current_user.cn
+    sso.name = current_user.display_name
+    sso.admin = current_user.is_admin?
+    sso.sso_secret = secret
+
+    redirect_to sso.to_url("#{Setting.discourse_public_url}/session/sso_login"),
+                allow_other_host: true
+  end
+end