require "oauth/signature/base"

module OAuth::Signature::HMAC
  class SHA256 < OAuth::Signature::Base
    implements "hmac-sha256"

    def body_hash
      Base64.encode64(OpenSSL::Digest::SHA256.digest(request.body || "")).chomp.delete("\n")
    end

    private

    def digest
      OpenSSL::HMAC.digest(OpenSSL::Digest.new("sha256"), secret, signature_base_string)
    end
  end
end