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LTI ruby implementation


Add these lines to your application's Gemfile:

gem 'ims-lti'
# only necessary if using ToolProxyRegistrationService:
gem 'faraday-oauth' # or faraday_middleware if using Faraday < 2.0

And then execute:

$ bundle

Or install it yourself as:

$ gem install lti


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 =, 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

params = { user_id: '123', lti_message_type: IMS::LTI::Models::Messages::BasicLTILaunchRequest::MESSAGE_TYPE }

header =, '', params, consumer_key: oauth_consumer_key, consumer_secret: secret)

signed_params = header.signed_attributes.merge(params), signed_params, secret)


  1. Fork it ( )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request