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应用程序

我正在编写一个需要从用户那里获取图片并将它们保存在 AWS S3 存储桶中的应用程序。

应用程序/模型/图片.rb

class Picture < ActiveRecord::Base

  include Paperclip::Glue

  belongs_to :user

  scope :active_objects, -> { where(is_deleted: false)}

  has_attached_file :image,

  :styles => {:medium => "800>", :small => "480>", :thumb => "100>"},
  :convert_options => {:medium =>'-quality 90', :small =>'-quality 80', :thumb => '-quality 50' },
  :storage => :s3,
  :url => ":s3_domain_url",
  :path => 'pictures/:id/image/:style/:basename.:extension',
  # :s3_permissions => :private,
  :s3_region => 's3-ap-southeast-1.amazonaws.com',
  :s3_endpoint => 's3-ap-southeast-1.amazonaws.com',
  :s3_credentials => Proc.new { |a| a.instance.s3_credentials }

  def s3_credentials
    {:bucket => App.secrets.bucket_name, :access_key_id => App.secrets.aws_access_key_id, 
      :secret_access_key => App.secrets.aws_secret_access_key}
  end

  def url(style_name = :original, time = 30.minutes.to_i)
    image.s3_permissions == :private ? (image.expiring_url(time, style_name)) : (image.url(style_name))
  end

end

问题

如您所见,我已将 s3_permissions 设置为 true,并且为了访问这些图片,我使用了 expiring_url 方法。现在,我想公开这些图片,所以我评论了 s3_permissions。

上传新图片后,我可以在不使用expiring_url方法的情况下访问图片

>> Picture.last.url

并且响应中的 url 在浏览器选项卡中打开了一个图像,但仍然无法访问之前上传的图像(Picture.first)。当我尝试打开网址时,它给了我这个

<Error>
<Code>AccessDenied</Code>
<Message>Access Denied</Message>
<RequestId>6423906A78A3FDFF</RequestId>
<HostId>
fowfNEi6+mM265iGig+jhT1/ih2P7yhPzNegHiS9Q6NrP4mnGNKkXFDefLva85tjAQ0uNbenYew=
</HostId>
</Error>

此外,他们的 s3_permissions 以 public_read 的形式出现。

>> Picture.first.image.s3_permissions
A, [2018-05-01T01:18:05.171381 #94266]   ANY -- : 2018-05-01 01:18:05 +0530 severity=DEBUG, Picture Load (0.7ms)  SELECT  "pictures".* FROM "pictures" ORDER BY "pictures"."id" ASC LIMIT $1  [["LIMIT", 1]]
=> :public_read
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1 回答 1

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您必须在 S3 端配置此访问权限。

将其放入您的存储桶策略中:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "PublicReadGetObject",
            "Effect": "Allow",
            "Principal": "*",
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::your_bucket_name/*"
        }
    ]
}
于 2018-04-30T23:46:19.550 回答