/usr/lib/ruby/vendor_ruby/ramaze/helper/user.rb is in ruby-ramaze 2012.12.08-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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module Helper
##
# This helper provides a convenience wrapper for handling authentication
# and persistence of users.
#
# On every request, when you use the {UserHelper#user} method for the first
# time, we confirm the authentication and store the returned object in the
# request.env, usually this will involve a request to your database.
#
# @example Basic usage with User::authenticate
# # We assume that User::[] will make a query and returns the requested
# # User instance. This instance will be wrapped and cached.
#
# class User
# def self.authenticate(creds)
# User[:name => creds['name'], :pass => creds['pass']]
# end
# end
#
# class Profiles < Ramaze::Controller
# helper :user
#
# def edit
# redirect_referrer unless logged_in?
# "Your profile is shown, your are logged in."
# end
# end
#
# class Accounts < Ramaze::Controller
# helper :user
#
# def login
# return unless request.post?
# user_login(request.subset(:name, :pass))
# redirect Profiles.r(:edit)
# end
#
# def logout
# user_logout
# redirect_referer
# end
# end
#
# On every request it checks authentication again and retrieves the model,
# we are not using a normal cache for this as it may lead to behaviour that
# is very hard to predict and debug.
#
# You can however, add your own caching quite easily.
#
# @example caching the authentication lookup with memcached
# # Add the name of the cache you are going to use for the authentication
# # and set all caches to use memcached
#
# Ramaze::Cache.options do |cache|
# cache.names = [:session, :user]
# cache.default = Ramaze::Cache::MemCache
# end
#
# class User
#
# # Try to fetch the user from the cache, if that fails make a query.
# # We are using a ttl (time to live) of one hour, that's just to show
# # you how to do it and not necessary.
# def self.authenticate(credentials)
# cache = Ramaze::Cache.user
#
# if user = cache[credentials]
# return user
# elsif user = User[:name => creds['name'], :pass => creds['pass']]
# cache.store(credentials, user, :ttl => 3600)
# end
# end
# end
#
# @example Using a lambda instead of User::authenticate
# # assumes all your controllers inherit from this one
#
# class Controller < Ramaze::Controller
# trait :user_callback => lambda{|creds|
# User[:name => creds['name'], :pass => creds['pass']]
# }
# end
#
# @example Using a different model instead of User
# # assumes all your controllers inherit from this one
#
# class Controller < Ramaze::Controller
# trait :user_model => Account
# end
#
# @author manveru
#
module UserHelper
# Using this as key in request.env
RAMAZE_HELPER_USER = 'ramaze.helper.user'.freeze
##
# Use this method in your application, but do not use it in conditionals
# as it will never be nil or false.
#
# @api external
# @author manveru
# @return [Ramaze::Helper::User::Wrapper] wrapped return value from
# model or callback
#
def user
env = request.env
found = env[RAMAZE_HELPER_USER]
return found if found
model, callback = ancestral_trait.values_at(:user_model, :user_callback)
model ||= ::User unless callback
env[RAMAZE_HELPER_USER] = Wrapper.new(model, callback)
end
##
# This method is used to authenticate a user against the supplied
# credentials (which default to ``request.params``).
#
# This method is a proxy to user._login which returns the value as
# returned by ``Ramaze::Helper::User::Wrapper#_login``.
#
# The supplied argument should be a hash with the user's credentials. The
# credentials hash may use any naming for the hash keys as long as they
# are consistent with the model which authenticates them (through the
# ``authenticate()`` method) such as:
#
# {"username" =>"name", "password" => "the_passwd"}
#
# On success it returns a hash of the credentials embedded within a hash
# whose only key is ':credentials' such as the following:
#
# {:credentials=>{"username"=>"myuser", "password"=>"mypassword"}}
#
# On failure to authenticate this method returns nil.
#
# @example
# auth = {"username" => "my_username", "password" => "mypass"}
# creds = user_login(auth)
# if creds
# respond 'You have been logged in as #{creds[:credentials]["username"]}', 200
# else
# respond 'You could not be logged in', 401
# end
#
# @author manveru
# @api external
# @see Ramaze::Helper::User::Wrapper#_login
# @param [Hash] creds the credentials that will be passed to the callback or model.
# @return [nil Hash[Hash]]
#
def user_login(creds = request.params)
user._login(creds)
end
##
# Shortcut for user._logout
#
# @author manveru
# @api external
# @see Ramaze::Helper::User::Wrapper#_logout
# @return [NilClass]
#
def user_logout
user._logout
end
##
# Checks if the user is logged in and returns true if this is the case and
# false otherwise.
#
# @author manveru
# @api external
# @see Ramaze::Helper::User::Wrapper#_logged_in?
# @return [TrueClass|FalseClass] whether the user is logged in already.
#
def logged_in?
user._logged_in?
end
##
# Wrapper for the ever-present "user" in your application. It wraps
# around an arbitrary instance and worries about authentication and
# storing information about the user in the session.
#
# In order to not interfere with the wrapped instance/model we start our
# methods with an underscore.
#
# Patches and suggestions are highly appreciated.
#
class Wrapper < BlankSlate
attr_accessor :_model, :_callback, :_user
def initialize(model, callback)
@_model, @_callback = model, callback
@_user = nil
_login
end
##
# @author manveru
# @see Ramaze::Helper::User#user_login
# @param [Hash] creds this hash will be stored in the session on
# successful login
# @return [Ramaze::Helper::User::Wrapper] wrapped return value from
# model or callback
#
def _login(creds = nil)
if creds
if @_user = _would_login?(creds)
Current.session.resid!
self._persistence = {:credentials => creds}
end
elsif persistence = self._persistence
@_user = _would_login?(persistence[:credentials])
end
end
##
# The callback should return an instance of the user, otherwise it
# should answer with nil.
#
# This will not actually login, just check whether the credentials
# would result in a user.
#
def _would_login?(creds)
return unless creds
if c = @_callback
c.call(creds)
elsif _model.respond_to?(:authenticate)
_model.authenticate(creds)
else
Log.warn(
"Helper::User has no callback and there is no %p::authenticate" \
% _model
)
nil
end
end
##
# @author manveru
# @api internal
# @see Ramaze::Helper::User#user_logout
#
def _logout
(_persistence || {}).clear
Current.request.env['ramaze.helper.user'] = nil
Current.session.resid!
end
##
# @author manveru
# @api internal
# @see Ramaze::Helper::User#logged_in?
# @return [true false] whether the current user is logged in.
#
def _logged_in?
!!_user
end
def _persistence=(obj)
Current.session[:USER] = obj
end
def _persistence
Current.session[:USER]
end
##
# Refer everything not known
# THINK: This might be quite confusing... should we raise instead?
#
def method_missing(meth, *args, &block)
return unless _user
_user.send(meth, *args, &block)
end
end
end # User
end # Helper
end # Ramaze
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