Using Microsoft Azure AD for API Authentication with Rails and Warden - azure_ad_json_web_token_strategy.rb

azure_ad_json_web_token_strategy.rb

require 'azure_ad_json_web_token'

class AzureAdJsonWebTokenStrategy < ::Warden::Strategies::Base
  def valid?
    token
  end

  def authenticate!
    if claims
      success! claims
    else
      fail!
    end
  end

  def claims
    ::AzureAdJsonWebToken.decode(token)[0]
  rescue
    nil
  end

  def token
    unless request.env['HTTP_AUTHORIZATION'].nil?
      request.env['HTTP_AUTHORIZATION'].split(' ').last
    end
  end
end