From: Petite Abeille <petite.abeille@...>
Date: 2012-02-21T17:53:09+09:00
Subject: Net::IMAP::ResponseParseError

Hello,

Net::IMAP seems to chock on some IMAP strings.

% ruby -v
ruby 1.8.7 (2010-01-10 patchlevel 249) [universal-darwin10.0]

For example:

require 'net/imap'

imap = Net::IMAP.new('localhost', 1143 )
imap.login('user', 'password')
imap.examine('INBOX')
imap.search(["ALL"]).each do |message_id|
  envelope = imap.fetch(message_id, "ENVELOPE")[0].attr["ENVELOPE"]
  puts "#{envelope.subject}"
end

ruby/1.8/net/imap.rb:3129:in `parse_error': unknown token - "\"Lua," (Net::IMAP::ResponseParseError)
	from ruby/1.8/net/imap.rb:3074:in `next_token'
	from ruby/1.8/net/imap.rb:2991:in `lookahead'
	from ruby/1.8/net/imap.rb:2889:in `nstring'
	from ruby/1.8/net/imap.rb:2086:in `envelope'

The over-the-wire protocol exchange looks like the following:

c: RUBY1300 FETCH 1297 ENVELOPE
s: * 1297 fetch (envelope ("Wed, 13 Oct 1999 12:44:07 +0000" "Lua, strfind \0-quirk/bug" (("Jon Kleiser" nil "jon.kleiser" "usit.uio.no")) (("Jon Kleiser" nil "jon.kleiser" "usit.uio.no")) (("Jon Kleiser" nil "jon.kleiser" "usit.uio.no")) ((nil nil "lua" "tecgraf.puc-rio.br")) (("Lua discussion list" nil "lua-l" "tecgraf.puc-rio.br")) nil nil "<v03110702b42a0d6d2710@[129.240.92.61]>"))

Note the envelope subject:

"Lua, strfind \0-quirk/bug"

Notice the literal "\0". As there is no escape sequences in IMAP, \0 should be treated as a regular string.