ruby-on-rails - Rails 4 - 如何使用载波在 froala 编辑器中上传图像？

Question

我不知道如何在 froala 编辑器中上传图片。我有 carrierwave 用于将图像上传到谷歌云存储以用于我的应用程序的其他部分，现在我希望在 froala 编辑器中上传图像也能正常工作。

这是我到目前为止所做的

上传图片

class PostImageUploader < CarrierWave::Uploader::Base

  # Choose what kind of storage to use for this uploader:
   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
    "post-image"
  end


  # Add a white list of extensions which are allowed to be uploaded.
  # For images you might use something like this:
   def extension_white_list
     %w(jpg jpeg gif png)
   end

  # Override the filename of the uploaded files:
  # Avoid using model.id or version_name here, see uploader/store.rb for details.
  def filename
   "#{model.id}-#{original_filename}" if original_filename.present?
  end

end

我做了一个后期图片模型

class PostImage < ActiveRecord::Base
  belongs_to :post
  mount_uploader :image, PostImageUploader
  validate  :image_size

    # Validates the size of an uploaded picture.
    def image_size
      if image.size > 5.megabytes
        errors.add(:picture, "should be less than 5MB")
      end
    end

end

我在我的 post Controller 中制作了 attach 和 detach 方法，但我不知道在它们里面放什么。

 def attach
 end

 def detach
 end

 def image_params
   params.require(:post_image).permit(:image)
 end

创建了连接和分离方法的路由，但它们可能是错误的，因为我不确定我是否需要这些方法。

match '/guides/:guide_id/posts/attach' => 'posts#attach', :via => :create, as: :attach_guide_post_image
match '/guides/:guide_id/posts/detach'=> 'posts#detach', :via => :delete, as: :detach_guide_post_image

我的 carriwewave 初始化器已经设置好并且可以工作(因为我在网站的其他地方使用它)所以我认为我不需要添加它。而且我认为我不需要添加我的后 Controller new 和 create 方法，它们的标准。

从这里我去了froala docs for image uploads ，但我不知道要输入哪些值，哪些是我需要的，哪些是我不需要的。我的问题是用大写字母写的评论。

 <script>
  $(function() {
    $('.editor')
      .froalaeditor({
        // Set the image upload parameter.
        imageUploadParam: 'image',
        // 1. I'M GUESSING THIS IS THE PARAM PASSED

        // Set the image upload URL.
        imageUploadURL: <%= attach_guide_post_image_path =%>,
        // 2. MADE THIS PATH IN THE ROUTES


        // Set request type.
        imageUploadMethod: 'POST',

        // Set max image size to 5MB.
        imageMaxSize: 5 * 1024 * 1024,

        // Allow to upload PNG and JPG.
        imageAllowedTypes: ['jpeg', 'jpg', 'png', 'gif']
      })
      .on('froalaEditor.image.beforeUpload', function (e, editor, images) {
        // Return false if you want to stop the image upload.

        //3. SO I PUT ERROR MESSAGE IN THESE?? IF SO SHOULD IT BE A POPUP OR TEXT ON THE SCREEN AND HOW
      })
      .on('froalaEditor.image.uploaded', function (e, editor, response) {
        // Image was uploaded to the server.
      })
      .on('froalaEditor.image.inserted', function (e, editor, $img, response) {
        // Image was inserted in the editor.
      })
      .on('froalaEditor.image.replaced', function (e, editor, $img, response) {
        // Image was replaced in the editor.
      })
      .on('froalaEditor.image.error', function (e, editor, error, response) {
        // Bad link.
        else if (error.code == 1) { ... }

        // No link in upload response.
        else if (error.code == 2) { ... }

        // Error during image upload.
        else if (error.code == 3) { ... }

        // Parsing response failed.
        else if (error.code == 4) { ... }

        // Image too text-large.
        else if (error.code == 5) { ... }

        // Invalid image type.
        else if (error.code == 6) { ... }

        // Image can be uploaded only to same domain in IE 8 and IE 9.
        else if (error.code == 7) { ... }

        // Response contains the original server response to the request if available.
      });
  });
</script>

这就是我得到的。我了解基本的 JS，并且已经使用 Rails 大约 6 个月了，所以我对它还很陌生。我从来没有在 rails 和 js 中做过这样的事情，也找不到可靠的指南。

以上是我得到的，但我卡住了。希望得到一些帮助，了解从那里需要做什么才能使图片上传正常工作。

Answer 1

我遇到了同样的问题，决定完全绕过 carrierwave，直接上传到 S3，如下所示:

      $('.post-editor').froalaEditor({
          toolbarBottom: true,
          toolbarButtons: ['bold', 'italic', 'underline', 'fontFamily', 'fontSize', 'paragraphFormat', 'align', 'formatOL', 'formatUL', 'insertLink', 'insertImage', 'insertVideo'],
          imageUploadToS3: {
            bucket: "<%= @hash[:bucket] %>",
            region: 's3-us-west-1',
            keyStart: "<%= @hash[:key_start] %>",
            callback: function (url, key) {},
            params: {
              acl: "<%= @hash[:acl] %>", // ACL according to Amazon Documentation.
              AWSAccessKeyId: "<%= @hash[:access_key] %>", // Access Key from Amazon.
              policy: "<%= @hash[:policy] %>", // Policy string computed in the backend.
              signature: "<%= @hash[:signature] %>", // Signature computed in the backend.
            }
          }
        })  

在 config/initializers/AWS_CONFIG.rb 中设置初始化程序:

AWS_CONFIG = {
  'access_key_id' => ENV["S3_ACCESS_KEY"],
  'secret_access_key' => ENV["S3_SECRET_KEY"],
  'bucket' => 'froala-bucket',
  'acl' => 'public-read',
  'key_start' => 'uploads/'
}

在 lib/amazon_signature.rb 中设置亚马逊签名:

module AmazonSignature
  extend self

  def signature
    Base64.encode64(
        OpenSSL::HMAC.digest(
          OpenSSL::Digest.new('sha1'),
          AWS_CONFIG['secret_access_key'], self.policy
        )
      ).gsub("\n", "")
  end

  def policy
    Base64.encode64(self.policy_data.to_json).gsub("\n", "")
  end

  def policy_data
    {
      expiration: 10.hours.from_now.utc.iso8601,
      conditions: [
        ["starts-with", "$key", AWS_CONFIG['key_start']],
        ["starts-with", "$x-requested-with", "xhr"],
        ["content-length-range", 0, 20.megabytes],
        ["starts-with", "$content-type", ""],
        {bucket: AWS_CONFIG['bucket']},
        {acl: AWS_CONFIG['acl']},
        {success_action_status: "201"}
      ]
    }
  end

  def data_hash
    {:signature => self.signature, :policy => self.policy, :bucket => AWS_CONFIG['bucket'], :acl => AWS_CONFIG['acl'], :key_start => AWS_CONFIG['key_start'], :access_key => AWS_CONFIG['access_key_id']}
  end
end

最后在你的 PostsController 中调用它:

before_action :set_hash_for_froala

...

def set_hash_for_froala
  @hash = AmazonSignature::data_hash
end

此视频非常有帮助:http://rubythursday.com/episodes/ruby-snack-23-froala-wysiwyg-saving-images-on-amazon-s3