限制每个用户上传到AWS S3的总大小(MB)(使用Shrine)

时间:2017-01-06 13:07:18

标签: ruby-on-rails amazon-s3 ruby-on-rails-5 shrine

我正在开发一个Rails应用程序,允许用户通过神社将他们的图像上传到AWS S3。到目前为止设置工作正常 - 但是,我想知道是否有任何直接提取每个用户的上传总大小。

例如,我确实希望免费用户只允许上传最大500MB,而会员可以说4GB。

Haven在Github或Google上发现任何可用的东西,一般来说,也许有人可以分享他们的知识。干杯!

当前代码:

photo.rb

class Photo < ApplicationRecord
  include ImageUploader[:image]

  before_create :set_name

  belongs_to :employee
  belongs_to :user

  private

    def set_name
      self.name = "Photo"
    end
end

image_uploader.rb

require "image_processing/mini_magick"

class ImageUploader < Shrine
  include ImageProcessing::MiniMagick
  plugin :determine_mime_type
  plugin :remove_attachment
  plugin :store_dimensions
  plugin :validation_helpers
  plugin :pretty_location
  plugin :processing
  plugin :versions

  Attacher.validate do
    validate_max_size 5.megabytes, message: "is too large (max is 5 MB)"
    validate_mime_type_inclusion %w[image/jpeg image/png], message: " extension is invalid. Please upload JPEGs, JPGs and PNGs only."
    validate_min_width 400, message: " must have a minimum width of 400 pixel."
    validate_min_height 250, message: " must have a minimum height of 250 pixel."
  end

  process(:store) do |io, context|

    size_800 = resize_to_limit!(io.download, 800, 800)
    size_300 = resize_to_limit!(io.download, 300, 300)

    {original: io, large: size_800, small: size_300}
  end
end

2 个答案:

答案 0 :(得分:2)

如果要在Photo模型的image列上添加验证错误消息,可以在Shrine验证中执行此操作,因为您可以访问那里的Photo记录。

class ImageUploader < Shrine
  # ...

  Attacher.validate do
    record #=> #<Photo ...>

    all_images = record.user.photos
      .select { |photo| photo.image_attacher.stored? }
      .map { |photo| photo.image[:large] }

    total_size = all_images.map(&:size).inject(0, :+)

    if total_size + get.size > 500.megabytes
      errors << "exceeds total maximum filesize for your account (max is 500MB)"
    end

    # ...
  end
end

首先,我们只过滤存在并上传到永久存储空间的附件(例如,如果您使用后台处理,则只会附加缓存文件的时间段。)

然后我们会对large版本的所有图片大小进行总结,如您的示例所示。

最后,我们将当前附件大小添加到总大小,如果超出限制,我们会添加验证错误。

答案 1 :(得分:0)

所以这是我的解决方案 - 自定义验证器。非常基本,但我认为这样做(没有经过全面测试,需要赶飞机):

class Photo < ApplicationRecord
  include ImageUploader[:image]
  include ActiveModel::Validations

  before_create :set_name

  belongs_to :employee
  belongs_to :user

  validate :upload_size_validation

  private

    def set_name
      self.name = "Photo"
    end

    def upload_size_validation
      size = 0

      user.photos.each do |photo|
        byebug
        size = size + photo.image[:large].size.to_i
      end

      errors[:photo] << " cannot be uploaded as you hit the quota of 5 MB" if size > 50000
    end
end

如果有更好的解决方案,请分享!