Basic-Lti-Demo
What is it?
A demo of basic LTI authentication in Spring Web MVC, not requiring the deprecated Spring-Security-Oauth
How to use
This is a maven project that should compile and run if the run.mycode.basiclti dependency is installed. (You'll have to download and mvn install yourself, not currently available on maven central).
The project should compile and execute with the command mvn spring-boot:run
In Canvas, you will be able to create an app with the url http://localhost:8080/lti/ using the consumer key KEY00001 and shared secret
secretkey then create an Assignment with External Tool Url http://localhost:8080/lti/test
Dependencies
This demo Spring Web MVC app relies on the IMS Global basiclti-util-java for signature verification, and my own basic lti authentication filter. You should only have to manually install my filter, it will install the IMS Global LTI util.
What to look for
run.mycode.basicltidemo.controller.LtiController
A demo controller. It shows an example endpoint /lti/test that only appears to properly verified LTI launch requests. It extracts the LTI Launch data
provided by the tool consumer into an LtiLaunchData object.
run.mycode.basicltidemo.config.LtiSecurityConfig
Configures the http stack to use the LtiAuthenticationProcessingFilter for all requests to the /lti/** tree (anything under /lti)
The LtiAuthenticationFilter requires a KeyService which can provide secrets for the consumer keys that are included in the launch request.
run.mycode.basicltidemo.service.MockKeyService
This is a demo key service that simply generates some consumer keys and associates them with Users. (Keys and secrets should be harder than
this to guess.)
run.mycode.basicltidemo.persistence.model.user
This is a demo User class that inherits from LtiKey to link consumer keys and shared secrets