RubyでTwitterにOAuthする割りかし短めのコード

oauth.rb

class OAuth

	attr_reader :screen_name, :consumer_key, :consumer_secret, :token, :token_secret

	def initialize(screen_name, consumer_key, consumer_secret, token, token_secret)
		@screen_name = screen_name
		@consumer_key = consumer_key
		@consumer_secret = consumer_secret
		@token = token
		@token_secret = token_secret
	end


	def post(url, param = {})
		request(url, :POST, param)
	end


	def get(url, param = {})
		request(url, :GET, param)
	end


	def request(url, method, param = {})
		uri = URI.parse(url)
		http = Net::HTTP.new(uri.host, uri.port)
		http.use_ssl = true
		http.verify_mode = OpenSSL::SSL::VERIFY_NONE
		param = generate_param(url, method.to_s.upcase, param)

		case method
		when :POST
			data = http.post(uri.path, build_query(param)).body
		when :GET
			data = http.get("#{uri.path}?#{build_query(param)}").body
		else
			return
		end
		
		data = JSON.parse(data, symbolize_names: true)
		raise data[:errors][0][:message] if data.include?(:errors)

		data
	end


	def default_param
		{
			oauth_consumer_key: @consumer_key,
			oauth_nonce: [*'A'..'Z'].sample(16).join(''),
			oauth_signature_method: 'HMAC-SHA1',
			oauth_timestamp: Time.now.to_i,
			oauth_token: @token,
			oauth_version: '1.0'
		}
	end


	def generate_param(url, method, param)
		data = default_param.merge(param)
		data[:oauth_signature] = generate_signature(url, method, data)
		data.sort
	end


	def generate_signature(url, method, param)
		value = param.sort.map{|key, val| "#{key}=#{encode(val.to_s)}"}.join('&')
		value = "#{method}&#{encode(url)}&#{encode(value)}"
		value = OpenSSL::HMAC.digest(OpenSSL::Digest::SHA1.new, "#{@consumer_secret}&#{@token_secret}", value)
		[value].pack('m').gsub(/\n/, '')
	end


	def build_query(data)
		data.map{|key, val| "#{key.to_s}=#{CGI.escape(val.to_s)}"}.join('&')
	end


	def encode(str)
		CGI.escape(str).gsub('%7E', '~').gsub('+', '%20')
	end

end