ruby - IMAP (Ruby) : Fail to fetch/save audio (. wav) 格式正确的附件

Question

我正在使用 IMAP api 访问我的邮箱并下载附件(.wav 音频文件)(如果有的话)。保存附件后，我希望它是一个可以播放的有效 .wav 文件，但它给了我无效的文件。

当我解码后保存附件(mail.attachments.first.decoded)时，它有以下内容:

  X-MCPBodyContent: --- 
  duration: 5
  internal_codec: alaw
  external_codec: wav
  type: 1
  filename: /9/04/04/04/05/m_88888_56b07809-1fe6-4cf7-8328-8e9bb0bd7716
  $$$$$

如果我按原样保存附件 (mail.attachments.first)，它具有以下内容:

  Date: Tue, 18 Oct 2011 09:06:07 -0400
  Mime-Version: 1.0
  Content-Type: audio/wav;
    charset=UTF-8
  Content-Transfer-Encoding: base64
  Content-Disposition: attachment;
   filename=m_88888_56b07809-1fe6-4cf7-8328-8e9bb0bd7716.wav
  Content-ID: <4e9d79bfa830f_7efc3f9579013bfc3648e@vavcafeserver2.mail>

  WC1NQ1BCb2R5Q29udGVudDogLS0tIApkdXJhdGlvbjogNQppbnRlcm5hbF9j
  b2RlYzogYWxhdwpleHRlcm5hbF9jb2RlYzogd2F2CnR5cGU6IDEKZmlsZW5h
  bWU6IC85LzA0LzA0LzA0LzA1L21fODg4ODhfNTZiMDc4MDktMWZlNi00Y2Y3
  LTgzMjgtOGU5YmIwYmQ3NzE2CiQkJCQk

这是代码片段:

require 'net/imap'
imap = Net::IMAP.new('the_url', 143, false, nil, false) 
imap.login('username', 'password') 
imap.select('Inbox') 
# All msgs in a folder 
msgs = imap.uid_search(["ALL"]) 

# Read each message 
msgs.each do |uid| 
  _body = imap.uid_fetch(uid, "RFC822")[0].attr["RFC822"]

  require 'mail'
  mail = Mail.new(_body)

  attachment = mail.attachments.first
  fn = attachment.filename
  begin
    File.open( fn, "w+b", 0644 ) { |f| f.write attachment.decoded}
  rescue Exception => e
    puts "Error : Unable to save data for #{fn} because #{e.message}"
  end
end  
imap.logout

请告诉我如何以正确的格式获取附件。

非常感谢任何帮助。

谢谢

Answer 1

以下适用于我 - 使用 mp3、jpg 和 pdf 文件进行测试。

new_mail = imap.search(["ALL"]).each do |uid|
  body = imap.fetch(uid, "BODY[]")[0].attr["BODY[]"]
  mail = Mail.new(body)
  mail.attachments.each do |a|
      File.open("/home/vknoll/Downloads/imap/#{a.filename}", 'wb') do |file|
        file.write(a.body.decoded)
      end
  end
end