LTI (http://www.imsglobal.org/lti/) allows an LMS to make use of the service(s) you provide. This gem makes it a little easier to enable LTI in your service or application.
Take a look at the example application (in the "examples" directory of the gem's installation) to get the basic idea.
Simply require this gem (sinatra-lti) in your Sinatra-based application. Doing so will add the following routes:
/config /launch /lti_required
The '/config' route can be used to provide an XML file to configure the LMS to use your service. The document is produced in accordance with the configuration you provide via a simple YAML file. You will need to notify the Sinatra-LTI of your YAML configuration. To do so, use Sinatra's configuration and:
set :lti_config, Pathname(FILE).dirname.join('lti_config.yml')
An example configuration file is available in the "example" directory of the gem's installation.
The '/launch' route is the entry point for the LMS and is where OAuth2 is validated and identity information is exchanged. If you must manually configure your LMS, this is the URL to which it should land first.
One note: as you create your application, you will also need to provide a '/' route in your Sinatra app. After a successful "launch" from the LMS, Sinatra-LTI will redirect to '/' with the expectation that this route will be the user's entry point to your service's functionality.
More documentation will be forthcoming. This set is intended to be just enough for you to puzzle out the rest. More robust and friendly docs are in the works.