sign_request

in gems/aws-sigv4/lib/aws-sigv4/signer.rb [152:211]
48 lines of code
6 McCabe index (conditional complexity)

      def sign_request(request)
        creds = fetch_credentials

        http_method = extract_http_method(request)
        url = extract_url(request)
        headers = downcase_headers(request[:headers])

        datetime =
          if headers.include? 'x-amz-date'
            Time.parse(headers.delete('x-amz-date'))
          end

        content_sha256 = headers.delete('x-amz-content-sha256')
        content_sha256 ||= sha256_hexdigest(request[:body] || '')

        sigv4_headers = {}
        sigv4_headers['host'] = headers['host'] || host(url)

        
        
        if headers.include? 'user-agent'
          headers['user-agent'] = "#{headers['user-agent']} crt-signer/#{@signing_algorithm}/#{Aws::Sigv4::VERSION}"
          sigv4_headers['user-agent'] = headers['user-agent']
        end

        headers = headers.merge(sigv4_headers) 

        config = Aws::Crt::Auth::SigningConfig.new(
          algorithm: @signing_algorithm,
          signature_type: :http_request_headers,
          region: @region,
          service: @service,
          date: datetime,
          signed_body_value: content_sha256,
          signed_body_header_type: @apply_checksum_header ?
            :sbht_content_sha256 : :sbht_none,
          credentials: creds,
          unsigned_headers: @unsigned_headers,
          use_double_uri_encode: @uri_escape_path,
          should_normalize_uri_path: @normalize_path,
          omit_session_token: @omit_session_token
        )
        http_request = Aws::Crt::Http::Message.new(
          http_method, url.to_s, headers
        )
        signable = Aws::Crt::Auth::Signable.new(http_request)

        signing_result = Aws::Crt::Auth::Signer.sign_request(config, signable)

        Signature.new(
          headers: sigv4_headers.merge(
            downcase_headers(signing_result[:headers])
          ),
          string_to_sign: 'CRT_INTERNAL',
          canonical_request: 'CRT_INTERNAL',
          content_sha256: content_sha256,
          extra: {config: config, signable: signable}
        )
      end