Class: AtomicLti1v1::Lti1v1Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/atomic_lti_1v1/lti_1v1_middleware.rb

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Lti1v1Middleware

Returns a new instance of Lti1v1Middleware.



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# File 'lib/atomic_lti_1v1/lti_1v1_middleware.rb', line 4

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/atomic_lti_1v1/lti_1v1_middleware.rb', line 14

def call(env)
  request = Rack::Request.new(env)
  if matches_path_prefixes?(request) && AtomicLti1v1::Lti1v1.is_lti_1v1?(request)
    oauth_consumer_key = request.params['oauth_consumer_key']

    lti_secret = nil
    begin
      lti_secret = AtomicLti1v1.secret_provider.call(oauth_consumer_key)
    rescue StandardError => e
      Rails.logger.error("Error looking up lti secret, #{e}")
    ensure
      if lti_secret.blank?
        Rails.logger.warn("No lti secret found for oauth_consumer_key: #{oauth_consumer_key}")
      end
    end

    if lti_secret.present? && AtomicLti1v1::Lti1v1.valid_lti_request?(request, lti_secret)
      env['atomic.validated.oauth_consumer_key'] = oauth_consumer_key
    elsif lti_secret.present? && !AtomicLti1v1::Lti1v1.valid_lti_request?(request, lti_secret)
      raise AtomicLti1v1::LtiValidationFailed, "Validation failed for oauth_consumer_key: #{oauth_consumer_key}"
    end

    # Let the frontend know there's no state to validate.  This is an LTI 1.3 thing.
    env["atomic.validated.state_validation"] = {
      state_verified: true,
    }
  end

  @app.call(env)
end

#matches_path_prefixes?(request) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/atomic_lti_1v1/lti_1v1_middleware.rb', line 8

def matches_path_prefixes?(request)
  AtomicLti1v1.path_prefixes.any? do |prefix|
    request.path.starts_with? prefix
  end
end