class TencentCloud::Common::AbstractClient

def build_req_with_v3_signature(action, params, req, options = {})
  content_type = req.method == 'GET' ? FORM_URLENCODED_CONTENT : JSON_CONTENT
  content_type = MULTIPART_CONTENT if options['IsMultipart']
  timestamp = Time.now.to_i
  req.header['Content-Type'] = content_type
  req.header['Host'] = endpoint
  req.header['X-TC-Action'] = action
  req.header['X-TC-Timestamp'] = timestamp
  req.header['X-TC-Version'] = @api_version
  req.header['X-TC-Region'] = @region
  req.header['X-TC-Language'] = @profile.language
  req.header['X-TC-Token'] = @credential.token if @credential.token
  req.header['X-TC-Content-SHA256'] = 'UNSIGNED-PAYLOAD' if @profile.unsigned_payload
  if req.method == 'GET'
    params = AbstractModel.format_params(nil, params)
    req.data = URI.encode_www_form(params)
    canonical_querystring = req.data
    payload = ''
  else
    case content_type
    when JSON_CONTENT
      req.data = JSON.generate(params, { 'ascii_only' => true, 'space' => ' ' })
    when MULTIPART_CONTENT
      binparas = options['binparas'] || []
      boundary = SecureRandom.hex
      req.header['Content-Type'] += '; boundary=' + boundary
      body = ''
      params.each do |k, v|
        body += "--#{boundary}\r\n"
        body += "Content-Disposition: form-data; name=\"#{k}\""
        if binparas.include? k
          body += "; filename=\"File\"\r\n"
        else
          body += "\r\n"
          if v.is_a?(Array) || v.is_a?(Hash)
            v = JSON.generate(v, { 'ascii_only' => true, 'space' => ' ' })
            body += "Content-Type: application/json\r\n"
          end
        end
        body += "\r\n#{v}\r\n"
      end
      body += "--#{boundary}--\r\n" unless body.empty?
      req.data = body
      # req.is_multipart = options['IsMultipart']
    else
      raise TencentCloudSDKException.new('ContentTypeError', "Unsupported content type: #{content_type}")
    end
    payload = req.data
    canonical_querystring = ''
  end
  payload = 'UNSIGNED-PAYLOAD' if @profile.unsigned_payload
  hashed_payload = Digest::SHA256.hexdigest(payload)
  authorization = Sign.sign_v3(content_type, endpoint, @profile.http_profile.req_method, req.uri,
                               canonical_querystring, hashed_payload, req.header['X-TC-Timestamp'],
                               @credential.secret_id, @credential.secret_key)
  req.header['Authorization'] = authorization
end