Initial release of Discourse

app/controllers/admin/impersonate_controller.rb

@@ -0,0 +1,20 @@
+class Admin::ImpersonateController < Admin::AdminController
+
+  def create
+    requires_parameters(:username_or_email)
+
+    user = User.where(['username_lower = lower(?) or lower(email) = lower(?) or lower(name) = lower(?)', 
+                        params[:username_or_email], 
+                        params[:username_or_email],
+                        params[:username_or_email]]).first
+    raise Discourse::NotFound if user.blank?
+
+    guardian.ensure_can_impersonate!(user)
+
+    # Log on as the user
+    log_on_user(user)
+
+    render nothing: true
+  end  
+
+end