使用 Paperclip 和 Multipart 请求将文件上传到 Rails JSON API 服务器

问题描述：

我想将文件从 Android 客户端上传到 Rails JSON API 服务器.

I want to upload a file from an Android client to a Rails JSON API server.

我正在从 Android 客户端发送一个 Multipart/form 请求，如下所示:

I'm sending a Multipart/form request from the Android client which looks like that:

Content-Type: multipart/form-data; boundary=d99ArGa2SaAsrXaGL_AdkNlmGn2wuflo5
Host: 10.0.2.2:3000
Connection: Keep-Alive
User-Agent: Apache-HttpClient/UNAVAILABLE (java 1.4)

--d99ArGa2SaAsrXaGL_AdkNlmGn2wuflo5
Content-Disposition: form-data; name="POSTDATA"
Content-Type: application/json; charset=UTF-8
Content-Transfer-Encoding: 8bit

{"tags":["test"],"location_id":1,"post":{"content":"test"}}
--d99ArGa2SaAsrXaGL_AdkNlmGn2wuflo5
Content-Disposition: form-data; name="IMAGEDATA"; filename="testimage.jpg"
Content-Type: image/jpeg
Content-Transfer-Encoding: binary

<BINARY DATA?
--d99ArGa2SaAsrXaGL_AdkNlmGn2wuflo5--

在 rails 控制器中，我正在使用以下代码创建新帖子:

in the rails controller i'm creating the new post with this code:

@parsed_json = JSON(params[:POSTDATA])
@post = @current_user.posts.new(@parsed_json["post"])

如何让 Paperclip 保存多部分表单中的附件?

how do I make Paperclip save the attachment from the multipart form ?

我可以这样做:

if params.has_key?(:IMAGEDATA)
    photo = params[:IMAGEDATA]
    photo.rewind

    @filename = "/tmp/tempfile"
    File.open(@filename, "wb") do |file|
      file.write(photo.read)
    end

    @post.photo = File.open(@filename)
  end

但它看起来不是最好的解决方案，而且，未使用在多部分请求中传递的文件名.

but it doesn't look like the best solution, also, the filename that is being passed in ther multipart request is not used.

答

纯 json 方法是不传递 content-type multipart-form，而是将文件作为 json 中的 base64 编码字符串传递.

The pure json way to do this is to not pass content-type multipart-form and pass the file as a base64 encoded string in the json.

我想通了，感谢这篇文章:http://www.rqna.net/qna/xyxun-paperclip-throws-nohandlererror-with-base64-photo.html

I figured this out thanks this post: http://www.rqna.net/qna/xyxun-paperclip-throws-nohandlererror-with-base64-photo.html

这是一个 json 示例:

Here's an example of the json:

"{\"account\":{\"first_name\":\"John\",\"last_name\":\"Smith\",\"email\":\"john@test.com\",\"password\":\"testtest\",\"avatar\":{\"data\":\"INSERT BASE64 ENCODED STRING OF FILE HERE\",\"filename\":\"avatar.jpg\",\"content_type\":\"image/jpg\"}}}"

然后在控制器中像这样在保存模型之前处理传入的头像.

Then in the controller process the incoming avatar like this before saving the model.

def process_avatar
  if params[:account] && params[:account][:avatar]
    data = StringIO.new(Base64.decode64(params[:account][:avatar][:data]))
    data.class.class_eval { attr_accessor :original_filename, :content_type }
    data.original_filename = params[:account][:avatar][:filename]
    data.content_type = params[:account][:avatar][:content_type]
    params[:account][:avatar] = data
  end
end

使用 Paperclip 和 Multipart 请求将文件上传到 Rails JSON API 服务器

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