module Doorkeeper::Helpers::Controller

def self.included(base)
  base.send :private,
            :authenticate_resource_owner!,
            :authenticate_admin!,
            :current_resource_owner,
            :resource_owner_from_credentials
end

def authenticate_admin!
  instance_eval &Doorkeeper.configuration.authenticate_admin
end

def authenticate_resource_owner!
  current_resource_owner
end

def current_resource_owner
  instance_eval &Doorkeeper.configuration.authenticate_resource_owner
end

def get_error_response_from_exception(exception)
  error_name = case exception
  when Errors::InvalidTokenStrategy
    :unsupported_grant_type
  when Errors::InvalidAuthorizationStrategy
    :unsupported_response_type
  when Errors::MissingRequestStrategy
    :invalid_request
  end
  OAuth::ErrorResponse.new :name => error_name, :state => params[:state]
end

def handle_token_exception(exception)
  error = get_error_response_from_exception exception
  self.headers.merge!  error.headers
  self.response_body = error.body.to_json
  self.status        = error.status
end

def resource_owner_from_credentials
  instance_eval &Doorkeeper.configuration.resource_owner_from_credentials
end

def server
  @server ||= Server.new(self)
end