如何在 Ruby On Rails 中使用 CarrierWave 对 S3 上传应用 sync_clock 选项

Question

由于请求时间与当前时间的差异太大，我每次都收到此错误。我发现我们需要应用 sync_clock 选项但无法配置地点。请参阅我的配置，请帮助我们配置同步时钟

错误：

  Expected(200) <=> Actual(403 Forbidden)
  request => {:headers=>{"Content-Length"=>54911, "Content-Type"=>"image/jpeg", "x-amz-acl"=>"public-read", "Cache-Control"=>"max-age=315576000", "Date"=>"Thu, 24 Oct 2013 01:14:14 +0000", "Authorization"=>"changed", "Host"=>"changed"}, :host=>"changed", :mock=>nil, :path=>"/uploads%2Fproject%2Fimage_1%2F697%2FHamburg-Speicher-im-Bau-090825.jpg", :port=>"443", :query=>nil, :scheme=>"https", :body=>#<File:/app/tmp/carrierwave/20131024-0114-2-7499/Hamburg-Speicher-im-Bau-090825.jpg>, :expects=>200, :idempotent=>true, :method=>"PUT"}
  response => #<Excon::Response:0x0000000b72f0a0 @body="<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Error><Code>RequestTimeTooSkewed</Code><Message>The difference between the request time and the current time is too large.</Message><MaxAllowedSkewMilliseconds>900000</MaxAllowedSkewMilliseconds><RequestId>EA8E8FF76B54D7F3</RequestId><HostId>/RiS+pn3JcKzOoArMhFRYmSBRYwRAptugp8W32XAT4vupukmxMCtHRKIHy7wy9BL</HostId><RequestTime>Thu, 24 Oct 2013 01:14:14 +0000</RequestTime><ServerTime>2013-10-24T01:29:49Z</ServerTime></Error>", @headers={"x-amz-request-id"=>"EA8E8FF76B54D7F3", "x-amz-id-2"=>"/RiS+pn3JcKzOoArMhFRYmSBRYwRAptugp8W32XAT4vupukmxMCtHRKIHy7wy9BL", "Content-Type"=>"application/xml", "Transfer-Encoding"=>"chunked", "Date"=>"Thu, 24 Oct 2013 01:29:47 GMT", "Connection"=>"close", "Server"=>"AmazonS3"}, @status=403>
  vendor/bundle/ruby/1.9.1/gems/excon-0.6.6/lib/excon/connection.rb:190:in `request' 

初始化器

  CarrierWave.configure do |config|
  if Rails.env.production?
    config.fog_directory  = 'ese-prod'
    config.fog_host       = 'https://s3.amazonaws.com/ese-prod'
  else
    config.fog_directory  = 'ese-dev'
    config.fog_host       = 'https://s3.amazonaws.com/ese-dev'
  end
  if Rails.env.production? || Rails.env.development?

    config.fog_credentials = {
       :provider               => 'AWS',
       :aws_access_key_id      => 'AAAAAAAAAAA',
       :aws_secret_access_key  => 'BBBBBBBBBBBB',
       :region                 => 'us-east-1'
     }
    config.fog_public     = true
    config.fog_attributes = {'Cache-Control' => 'max-age=315576000'}

    config.root = Rails.root.join('tmp') # adding these...
    config.cache_dir = 'carrierwave' # ...two lines

  # elsif Rails.env.development?
  #  config.storage = :file
  else
    config.storage = :file
  end
end

上传者

class ImageUploader < CarrierWave::Uploader::Base

  include CarrierWave::MiniMagick
  if Rails.env.production? || Rails.env.development?
    storage :fog
  else
    storage :file
  end

  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

  version :thumb do
    process :resize_to_limit => [50, 50]
  end

  version :partner do
    process :resize_to_limit => [150, 150]
  end

  def extension_white_list
    %w(jpg jpeg gif png)
  end
end

Answer 1

不幸的是，这是发生的事情。值得庆幸的是有一个修复。

在初始化程序中，您应该能够执行以下操作：

Fog::Storage.new(fog_credentials).sync_clock

您应该能够在此处为雾凭据的初始化程序中使用传递给配置的相同值。 sync_clock 向 S3 发出一个简单的请求并存储偏移量（然后通过偏移量修改它发送的时间戳）。所以这应该确保你不会再看到这个错误（尽管它不应该经常出现，即如果你重新部署到heroku，新的测功机可能不会仍然有偏差）。希望可以解决问题，但如果需要，我们很乐意提供更多帮助。

Answer 2

S3 的响应意味着您请求中的“日期”标头不正确超过 15 分钟。你应该检查：

1. 您的系统时间设置正确
2. 您的时区设置正确

另见：

• https://stackoverflow.com/a/7749214/1546887
• http://www.whatibroke.com/?p=702
• http://www.bucketexplorer.com/documentation/amazon-s3--difference-between-requesttime-currenttime-too-large.html