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# IMS LTI

[![Build Status](https://travis-ci.org/instructure/ims-lti.svg?branch=2.1.x)](https://travis-ci.org/instructure/ims-lti)

LTI ruby implementation

## Installation

Add this line to your application's Gemfile:

gem 'ims-lti'

And then execute:

$ bundle

Or install it yourself as:

$ gem install lti

## 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
```ruby
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

```

## Contributing

1. Fork it ( http://github.com/instructure/ims-lti/fork )
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

CANCEL

Name	Type	Size	Modified	Actions
↩ ..	DIR	—	—
📁 lib/	DIR	—	2023-09-24 03:48
📄 Changelog.txt	TXT	0 B	2023-09-24 03:48	EDIT
📄 LICENSE.txt	TXT	1 KB	2023-09-24 03:48	EDIT
📄 README.md	MD	1.2 KB	2023-09-24 03:48	EDIT