问AWSAccessKeyId未授权

EN

AWS.NotAuthorized The identity contained in the request is not authorized to use this AWSAccessKeyId

    now = DateTime.now

    #For creating the signature hash
    data = "AWSMechanicalTurkRequesterGetFileUploadURL" + now.to_s
    sha256 = OpenSSL::Digest::SHA256.new
    sig = OpenSSL::HMAC.digest(sha256, Rails.configuration.secret_key, data)
    signature = Base64.encode64(sig)
    puts "https://mechanicalturk.amazonaws.com", "/?Service=AWSMechanicalTurkRequester&AWSAccessKeyId=#{Rails.configuration.aws_key}&Version=2014-08-15&Operation=GetFileUploadURL&Signature=#{sig}&Timestamp=#{now}&AssignmentId=#{mturk_results[0][:AssignmentId]}&QuestionIdentifier=file1"

    puts "\n\n"

    uri = URI('https://mechanicalturk.amazonaws.com')
    params = {:Service=>"AWSMechanicalTurkRequester", :AWSAccessKeyId=>Rails.configuration.aws_key, :Version=>"2014-08-15", :Operation=>"GetFileUPloadURL", :Signature=>sig, :Timestamp=>now, :AssignmentId=>mturk_results[0][:AssignmentId], :QuestionIdentifier=>"file1"}
    uri.query = URI.encode_www_form(params)
    res = 0
    Net::HTTP.start(uri.host, uri.port,
        :use_ssl => uri.scheme == 'https') do |http|
        request = Net::HTTP::Get.new uri

        res = http.request request # Net::HTTPResponse object
    end