ruby-on-rails - 使用载波和rmagick上传到s3的exif图像旋转问题

Question

我的Rails应用程序中有照片上传功能。该应用程序通过rmagick和fog通过载波直接上传到s3。我遇到的问题是当通过肖像中的“拍摄照片选项”通过手机上传照片时(请注意，这是在iphone上，但我相信android也存在同样的问题)。上载后，图片在移动设备上看起来不错，但是在台式机上查看时，图片似乎旋转了90度。

通过我的研究，似乎与exif有关。该stackoverflow responder概述了2个潜在的解决方案。这个gist也看起来很有希望。

到目前为止，我发现已经发布了一些解决方案，但是没有一个起作用。理想情况下，我希望将照片作为肖像保存到s3，然后按原样显示图像。

任何建议都很好。

下面是我的代码

app / uploaders / image_uploader.rb

class ImageUploader < CarrierWave::Uploader::Base
  include CarrierWaveDirect::Uploader

  include CarrierWave::RMagick

  # Include the Sprockets helpers for Rails 3.1+ asset pipeline compatibility:
  include Sprockets::Helpers::RailsHelper
  include Sprockets::Helpers::IsolatedHelper

  include CarrierWave::MimeTypes
  process :fix_exif_rotation
  process :set_content_type


  version :thumb do
    process resize_to_fill: [200, 200]
  end

  def extension_white_list
    %w(jpg jpeg png)
  end


  def fix_exif_rotation #this is my attempted solution
    manipulate! do |img|
      img = img.auto_orient!
    end
  end


end

app / models / s3_image.rb

class S3Image < ActiveRecord::Base
  attr_accessible :image, :name, :user_id
  mount_uploader :image, ImageUploader

  belongs_to :user


  def image_name
    File.basename(image.path || image.filename) if image
  end


  class ImageWorker
    include Sidekiq::Worker

    def perform(id, key)
      s3_image = S3Image.find(id)
      s3_image.key = key
      s3_image.remote_image_url = s3_image.image.direct_fog_url(with_path: true)
      s3_image.save!
      s3_image.update_column(:image_processed, true)
    end
  end
end

config / initializers / carrierwave.rb

CarrierWave.configure do |config|
  config.fog_credentials = {
    provider: "AWS",
    aws_access_key_id: " ... ",
    aws_secret_access_key: " ... "
  }
  config.fog_directory = " ... "
end

顺便说一句，我将此 Railscast用作设置s3上传的指南。

Answer 1

好吧，我使用雾代替了这个方法，或者使用了carrierwave_direct。

以下是最终为我工作的代码:

app / uploaders / image_uploader.rb

class ImageUploader < CarrierWave::Uploader::Base
   include CarrierWave::MiniMagick

   include Sprockets::Helpers::RailsHelper
   include Sprockets::Helpers::IsolatedHelper

   storage :fog

  # Override the directory where uploaded files will be stored.
  # This is a sensible default for uploaders that are meant to be mounted:
  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end


  def fix_exif_rotation #this is my attempted solution
    manipulate! do |img|
      img.tap(&:auto_orient)
    end
  end

  process :fix_exif_rotation
end

app / models / s3_image.rb

class S3Image < ActiveRecord::Base
  attr_accessible :image, :name, :user_id, :image_cache
  mount_uploader :image, ImageUploader

  belongs_to :user
end

初始值设定项/carrierwave.rb

CarrierWave.configure do |config|
  config.fog_credentials = {
    provider: "AWS",
    aws_access_key_id: " ... ",
    aws_secret_access_key: " ... ",
    region: 'us-west-2'
  }
  config.fog_directory = " ... "
end