From: Rupak Sah <sah.rupak@...>
Date: 2011-10-24T15:34:10+09:00
Subject: IMAP : Fail to download Audio attachment in correct format

Hi All,

I am using IMAP apis to access my mailbox and download attachments (.wav
audio file) if any. After saving the attachment, I expect it to be a
valid .wav file which I could play, but it gives me invalid file.

When I save the attachment after decoding
(mail.attachments.first.decoded), it has the following contents:
  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
  $$$$$

If I save the attachment as it is (mail.attachments.first), it has the
following:
  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


Here is the code snippet:

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

Please let me know how to get the attachment in correct format.

Any help would highly be appreciated.

~Rupak

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