IMS LTI

LTI ruby implementation

Installation

Add this line to your application's Gemfile:

gem 'qalam_ims_lti'

And then execute:

$ bundle

Usage

LTI 1.x

Validating Launches

You can use the classes in the IMS::LTI::Models::Messages module to valdiate Launches

For example in a rails app you would do the following

authenticator = IMS::LTI::Services::MessageAuthenticator.new(request.url, request.request_parameters, shared_secret)

#Check if the signature is valid
return false unless authenticator.valid_signature?

# check if `params['oauth_nonce']` has already been used

#check if the message is too old
return false if DateTime.strptime(request.request_parameters['oauth_timestamp'],'%s') < 5.minutes.ago