Example code to make hmac signed oauth2 requests

oauth2_mac_client_example.rb

require 'uri'
require 'cgi'
require 'net/https'
require 'json'
require 'oauth2_mac_client'

# oauth2_mac_client gem at https://github.com/herestomwiththeweather/oauth2_mac_client
# usage using this test class:
# > client = OAuth2Client.new
# > client.get_token('refresh_token') # get a new MAC type access token
# > client.list_payments # GET
# > client.test_payment # POST

class OAuth2Client
  attr_accessor :refresh_token, :access_token, :access_secret, :issued_at

  def initialize
    @access_token = ""
    @access_secret = ""
    @issued_at = nil
    @refresh_token = refresh_token
  end

  def provider_url
    'https://evening-ocean-4975.herokuapp.com'
    #ENV['OAUTH_PROVIDER_URL'] || ""
  end

  def client_id
    'Y0UrvQT9mhmlr8mwsAV09w=='
    #ENV['OAUTH_CLIENT_ID'] || ""
  end

  def client_secret
    'OwGJBrKY23dbEnpo5wGPsTz5N57htGIFn5/yqEO+55F7dReK0bK3kpj/lMk3gq7LpKiU0rsTXXd4L24InXiolQ=='
    #ENV['OAUTH_CLIENT_SECRET'] || ""
  end

  def code
    ENV['OAUTH_CLIENT_CODE'] || ""
  end

  def refresh_token
    'nKuK5wZTkHkgPZ9mhS7l9G4n0SpJi8UDG0jxqy5fKOA5yMDST7jjr8hVitfrzhEjXiygeW3I14sNxmA85CU9dg==' || ''
    #ENV['OAUTH_CLIENT_REFRESH_TOKEN'] || ""
  end

  def redirect_uri
    'http://ubuntu.local:3001/oauth/callback'
    #ENV['OAUTH_REDIRECT_URI'] || ""
  end

  def test_payment
    access_token=Oauth2MacClient::Token.new(access_token:@access_token,mac_key:@access_secret,mac_algorithm:'hmac-sha-256',issued_at:@issued_at)
    payment_url=provider_url+'/transacts/credits'
    uri=URI.parse(payment_url)
    http=Net::HTTP.new(uri.host,uri.port)
    http.set_debug_output(Logger.new(STDOUT))
    http.use_ssl=true
    http.ca_path = '/etc/ssl/certs'
    http.verify_mode = OpenSSL::SSL::VERIFY_PEER
    body={to:'herestomwiththeweather@gmail.com',amount:12.50,note:'guitar lessons'}
    request=Net::HTTP::Post.new(uri.request_uri)
    request.set_form_data(body)
    request['Authorization']=access_token.construct_authorization_header(payment_url,'post',request.body)
    request['Accept']='application/json'
    response=http.request(request)
  end

  def list_payments
    access_token=Oauth2MacClient::Token.new(access_token:@access_token,mac_key:@access_secret,mac_algorithm:'hmac-sha-256',issued_at:@issued_at)
    payment_url=provider_url+'/transacts/credits'
    uri=URI.parse(payment_url)
    http=Net::HTTP.new(uri.host,uri.port)
    http.set_debug_output(Logger.new(STDOUT))
    http.use_ssl=true
    http.ca_path = '/etc/ssl/certs'
    http.verify_mode = OpenSSL::SSL::VERIFY_PEER
    request=Net::HTTP::Get.new(uri.request_uri)
    request['Authorization']=access_token.construct_authorization_header(payment_url,'get')
    request['Accept']='application/json'
    response=http.request(request)
  end

  def code_or_refresh_token(grant_type)
    if('authorization_code'==grant_type)
      "code=#{CGI::escape code}"
    else # refresh_token
      "refresh_token=#{CGI::escape refresh_token}"
    end
  end

  def get_token(grant_type)
    u = URI.parse(provider_url)
    http = ::Net::HTTP.new(u.host,u.port)
    http.use_ssl = true
    http.ca_path = '/etc/ssl/certs'
    http.verify_mode = OpenSSL::SSL::VERIFY_PEER

    body = ''
    body += "client_id=#{CGI::escape client_id}"
    body += "&client_secret=#{CGI::escape client_secret}"
    body += "&#{code_or_refresh_token(grant_type)}"
    body += "&grant_type=#{grant_type}"
    body += "&redirect_uri=#{CGI::escape redirect_uri}"

    response = http.post('/oauth/token',body,"Content-Type" => "application/x-www-form-urlencoded")

    @body = JSON.parse(response.body)
    if @body['error'].nil?
      @access_secret = ''
      @access_token = @body['access_token']
      if 'mac' == @body['token_type']
        @access_secret = @body['mac_key']
      end
      log_tokens
      @issued_at = Time.now
      if('authorization_code'==grant_type)
        @refresh_token = @body['refresh_token']
      end
    else
      puts "***#{@body['error']}*** #{@body['error_description']}"
      false
    end
  end

  def log_tokens
    token_type = @body['token_type']
    expires_in = @body['expires_in']
    puts "[#{token_type}] token expires in #{expires_in} sec"
    puts "access_token: #{@access_token}"
    if 'mac' == @body['token_type']
      puts "access_secret: #{@access_secret}"
      puts "mac algorithm: #{@body['mac_algorithm']}"
    end
    puts "refresh_token: #{@refresh_token}"
  end
end