* initial commit of the stripped restful-authentication

* http basic auth and login from cookie have been removed
* no it does not work yet, it's so f*cking secure, it won't even let legitimate users login

1 files changed, 127 insertions, 0 deletions

diff --git a/lib/authenticated_system.rb b/lib/authenticated_system.rb
new file mode 100644
index 0000000..7b813f4
--- /dev/null
+++ b/lib/authenticated_system.rb
@@ -0,0 +1,127 @@
+module AuthenticatedSystem
+  protected
+    # Returns true or false if the user is logged in.
+    # Preloads @current_user with the user model if they're logged in.
+    def logged_in?
+      !!current_user
+    end
+
+    # Accesses the current user from the session.
+    # Future calls avoid the database because nil is not equal to false.
+    def current_user
+      @current_user ||= login_from_session unless @current_user == false
+    end
+
+    # Store the given user id in the session.
+    def current_user=(new_user)
+      session[:user_id] = new_user ? new_user.id : nil
+      @current_user = new_user || false
+    end
+
+    # Check if the user is authorized
+    #
+    # Override this method in your controllers if you want to restrict access
+    # to only a few actions or if you want to check if the user
+    # has the correct rights.
+    #
+    # Example:
+    #
+    #  # only allow nonbobs
+    #  def authorized?
+    #    current_user.login != "bob"
+    #  end
+    #
+    def authorized?(action = action_name, resource = nil)
+      logged_in?
+    end
+
+    # Filter method to enforce a login requirement.
+    #
+    # To require logins for all actions, use this in your controllers:
+    #
+    #   before_filter :login_required
+    #
+    # To require logins for specific actions, use this in your controllers:
+    #
+    #   before_filter :login_required, :only => [ :edit, :update ]
+    #
+    # To skip this in a subclassed controller:
+    #
+    #   skip_before_filter :login_required
+    #
+    def login_required
+      authorized? || access_denied
+    end
+
+    # Redirect as appropriate when an access request fails.
+    #
+    # The default action is to redirect to the login screen.
+    #
+    # Override this method in your controllers if you want to have special
+    # behavior in case the user is not authorized
+    # to access the requested action.  For example, a popup window might
+    # simply close itself.
+    def access_denied
+      respond_to do |format|
+        format.html do
+          store_location
+          redirect_to new_session_path
+        end
+      end
+    end
+
+    # Store the URI of the current request in the session.
+    #
+    # We can return to this location by calling #redirect_back_or_default.
+    def store_location
+      session[:return_to] = request.request_uri
+    end
+
+    # Redirect to the URI stored by the most recent store_location call or
+    # to the passed default.  Set an appropriately modified
+    #   after_filter :store_location, :only => [:index, :new, :show, :edit]
+    # for any controller you want to be bounce-backable.
+    def redirect_back_or_default(default)
+      redirect_to(session[:return_to] || default)
+      session[:return_to] = nil
+    end
+
+    # Inclusion hook to make #current_user and #logged_in?
+    # available as ActionView helper methods.
+    def self.included(base)
+      base.send :helper_method, :current_user, :logged_in?, :authorized? if base.respond_to? :helper_method
+    end
+
+    #
+    # Login
+    #
+
+    # Called from #current_user.  First attempt to login by the user id stored in the session.
+    def login_from_session
+      self.current_user = User.find_by_id(session[:user_id]) if session[:user_id]
+    end
+    
+    #
+    # Logout
+    #
+
+    # This is ususally what you want; resetting the session willy-nilly wreaks
+    # havoc with forgery protection, and is only strictly necessary on login.
+    # However, **all session state variables should be unset here**.
+    def logout_keeping_session!
+      # Kill server-side auth cookie
+      @current_user.forget_me if @current_user.is_a? User
+      @current_user = false     # not logged in, and don't do it for me
+      kill_remember_cookie!     # Kill client-side auth cookie
+      session[:user_id] = nil   # keeps the session but kill our variable
+      # explicitly kill any other session variables you set
+    end
+
+    # The session should only be reset at the tail end of a form POST --
+    # otherwise the request forgery protection fails. It's only really necessary
+    # when you cross quarantine (logged-out to logged-in).
+    def logout_killing_session!
+      logout_keeping_session!
+      reset_session
+    end
+end