Rails 上传文件到 ftp 服务器 [英] Rails upload file to ftp server

问题描述

我正在使用 Rails 2.3.5 和 Ruby 1.8.6，并试图弄清楚如何让用户通过我的 Rails 应用程序将文件上传到另一台机器上的 FTP 服务器.此外，我的 Rails 应用程序将托管在 Heroku 上，这不利于将文件写入本地文件系统.

I'm on Rails 2.3.5 and Ruby 1.8.6 and trying to figure out how to let a user upload a file to a FTP server on a different machine via my Rails app. Also my Rails app will be hosted on Heroku which doesn't facilitate the writing of files to the local filesystem.

index.html.erb

index.html.erb

<% form_tag '/ftp/upload', :method => :post, :multipart => true do %>
<label for="file">File to Upload</label> <%= file_field_tag "file" %>
<%= submit_tag 'Upload' %>
<% end %>

ftp_controller.rb

ftp_controller.rb

require 'net/ftp'

class FtpController < ApplicationController
  def upload
    file = params[:file]
    ftp = Net::FTP.new('remote-ftp-server')
    ftp.login(user = "***", passwd = "***")
    ftp.putbinaryfile(file.read, File.basename(file.original_filename))
    ftp.quit()
  end

  def index
  end

end

目前我只是想让 Rails 应用程序在我的 Windows 笔记本电脑上运行.使用上面的代码，我得到了这个错误

Currently I'm just trying to get the Rails app to work on my Windows laptop. With the above code, I'm getting this error

Errno::ENOENT in FtpController#upload
No such file or directory -.... followed by a dump of the file contents

我正在尝试上传一个 CSV 文件，如果这有什么不同的话.有谁知道怎么回事?

I'm trying to upload a CSV file if that makes any difference. Anyone knows what's going on?

推荐答案

经过大量研究和头脑风暴，我最终阅读了 putbinaryfile 方法的源代码，以找出解决 putbinaryfile 限制的解决方法.这是工作代码，替换此行

After much research and head banging, I ended up reading the source code for putbinaryfile method to figure out a workaround for the limitation of putbinaryfile. Here's the working code, replace this line

ftp.putbinaryfile(file.read, File.basename(file.original_filename))

与

ftp.storbinary("STOR " + file.original_filename, StringIO.new(file.read), Net::FTP::DEFAULT_BLOCKSIZE)

如果您想知道，STOR 是一个原始的 FTP 命令，是的.我很惊讶这种情况并不能更容易地由 Ruby 标准库处理，当然需要做什么并不明显.

And in case you are wondering, STOR is a raw FTP command, yeah it came to that. I'm rather surprised this scenario isn't more easily handled by Ruby standard libraries, it certainly wasn't obvious what needed to be done.

如果您的应用在 Heroku 上，请添加此行

And if your app is on Heroku, add this line

ftp.passive = true

Heroku 的防火墙设置不允许 FTP 主动模式，还要确保您的 FTP 服务器支持被动模式.

Heroku's firewall setup does not allow for FTP active mode, also make sure that your FTP server supports passive mode.

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