class OAuth2::Strategy::Password

def access_token_params(username, password, options={}) #:nodoc:
  super(options).merge({
    'grant_type'  => 'password',
    'username'    => username,
    'password'    => password
  })
end

def authorize_url
  raise NotImplementedError, "The authorization endpoint is not used in this strategy"
end

def get_access_token(username, password, options={})
  response = @client.request(:post, @client.access_token_url, access_token_params(username, password, options))
  params   = MultiJson.decode(response) rescue nil
  # the ActiveSupport JSON parser won't cause an exception when
  # given a formencoded string, so make sure that it was
  # actually parsed in an Hash. This covers even the case where
  # it caused an exception since it'll still be nil.
  params   = Rack::Utils.parse_query(response) unless params.is_a? Hash
  access   = params.delete('access_token')
  refresh  = params.delete('refresh_token')
  expires_in = params.delete('expires_in')
  OAuth2::AccessToken.new(@client, access, refresh, expires_in, params)
end