本文介绍了使用carrierwave和rmagick上传到s3的exif图像旋转问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我的 Rails 应用中有照片上传功能.该应用程序通过 rmagick 和fog 通过carrierwave 直接上传到s3.我遇到的问题是当照片通过移动设备通过纵向的拍照选项"上传时(注意这是使用 iphone 但我相信 android 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，图像似乎旋转了 90 度.

I've got a photo upload feature in my rails app. The app uploads direct to s3 through carrierwave via rmagick and fog. The issue I am having is when a photo is uploaded via mobile through the "take a photo option" in portrait (note this is with iphone but I believe android has the same issue). Once uploaded the image appears fine on mobile, however when viewed on desktop the image appears rotated 90 degrees.

通过我的研究，它看起来是 exif 的问题.此stackoverflow 响应程序概述了 2 种可能的解决方案.这个 gist 看起来也很有前景.

Through my research it looks to be an issue with exif. This stackoverflow responder outlines 2 potential solutions. This gist also looks promising as well.

到目前为止，我发现了一些已发布的解决方案，但都没有奏效.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.

So far I have found a few solutions posted but none have worked. Ideally I would like the photo to be saved to s3 as a portrait, then just display the image as is.

非常感谢任何建议.

下面是我的代码

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，我使用这个 Railscast 作为设置我的指南s3 上传.

btw I used this Railscast as a guide for setting up my s3 upload.

推荐答案

好吧，我使用雾或carrierwave_direct 来解决这个问题.

Well I got this working using fog instead or carrierwave_direct.

以下是最终为我工作的代码:

Below is the code that ended up working for me:

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

初始化程序/carrierwave.rb

initializers/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

这篇关于使用carrierwave和rmagick上传到s3的exif图像旋转问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！