我的 Rails 应用程序中有照片上传功能。该应用程序通过 rmagick 和雾通过 Carrierwave 直接上传到 s3。我遇到的问题是，当通过手机通过肖像中的“拍照选项”上传照片时（注意这是 iPhone 上的，但我相信 Android 也有同样的问题）。上传后，图像在移动设备上显示正常，但在桌面上查看时，图像会旋转 90 度。

通过我的研究，这似乎是 exif 的问题。这堆栈溢出响应者 https://stackoverflow.com/a/1051177/2066855概述了 2 个潜在的解决方案。这gist https://gist.github.com/jcsrb/1510601看起来也很有希望。

到目前为止，我发现了一些已发布的解决方案，但没有一个有效。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。

如有任何建议，我们将不胜感激。

下面是我的代码

应用程序/上传器/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

应用程序/模型/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

配置/初始化器/Carrierwave.rb

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

顺便说一句我用过这个铁路广播公司 http://railscasts.com/episodes/383-uploading-to-amazon-s3作为设置我的 s3 上传的指南。

好吧，我使用雾或 Carrierwave_direct 来完成这项工作。

下面是最终为我工作的代码：

应用程序/上传器/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

应用程序/模型/s3_image.rb

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

  belongs_to :user
end

初始化器/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