[sup-devel] [PATCH] Bugfix: fix regexp for detecting filename in Content-Disposition header

From: Michael Stapelberg <michael+sup@stapelberg.de>
To: Rich Lane <rlane@club.cc.cmu.edu>
Cc: sup-devel <sup-devel@rubyforge.org>
Subject: [sup-devel] [PATCH] Bugfix: fix regexp for detecting filename in Content-Disposition header
Date: Sun, 10 Oct 2010 23:02:28 +0200	[thread overview]
Message-ID: <1286744439-sup-1534@midna.zekjur.net> (raw)

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Hi,

quote from the commit message:

    In a message written in some Microsoft mail program (the only header is
    "X-MimeOLE: Produced By Microsoft Exchange V6.5"), the filename part of
    the Content-Disposition header spans multiple lines (due to the filename
    being very long and encoded in base64 due to the use of UTF-8):
    
    Content-Disposition: attachment;
            filename="=?utf-8?B?VGFnIGRlciBPZmZlbmVuIFTDvHIgZGVzIFByb2pla3Rl?=
            =?utf-8?B?cyBMZXJucGF0ZW5zY2hhZnRlbiBpbSBFbW1lcnRzZ3I=?=
            =?utf-8?B?dW5kLmRvY3g=?="
    
    The previous regexp did not properly match the whole string, but only the
    first line. This is fixed by adding the 'm' option (to match newlines as
    characters) and using \z instead of $ ("end of string" instead of "end of
    line").
    
    The same fix is also applied to the Content-Type header one line below.


Best regards,
Michael

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From 8b34ae2c2ac7af0647c8aa5c0ad135f0eae42cdc Mon Sep 17 00:00:00 2001
From: Michael Stapelberg <michael@stapelberg.de>
Date: Sun, 10 Oct 2010 22:30:46 +0200
Subject: [PATCH] Bugfix: fix regexp for detecting filename in Content-Disposition header

In a message written in some Microsoft mail program (the only header is
"X-MimeOLE: Produced By Microsoft Exchange V6.5"), the filename part of
the Content-Disposition header spans multiple lines (due to the filename
being very long and encoded in base64 due to the use of UTF-8):

Content-Disposition: attachment;
        filename="=?utf-8?B?VGFnIGRlciBPZmZlbmVuIFTDvHIgZGVzIFByb2pla3Rl?=
        =?utf-8?B?cyBMZXJucGF0ZW5zY2hhZnRlbiBpbSBFbW1lcnRzZ3I=?=
        =?utf-8?B?dW5kLmRvY3g=?="

The previous regexp did not properly match the whole string, but only the
first line. This is fixed by adding the 'm' option (to match newlines as
characters) and using \z instead of $ ("end of string" instead of "end of
line").

The same fix is also applied to the Content-Type header one line below.
---
 lib/sup/message.rb |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/lib/sup/message.rb b/lib/sup/message.rb
index 69669bd..cf0e505 100644
--- a/lib/sup/message.rb
+++ b/lib/sup/message.rb
@@ -475,10 +475,12 @@ private
       end
     else
       filename =
-        ## first, paw through the headers looking for a filename
-        if m.header["Content-Disposition"] && m.header["Content-Disposition"] =~ /filename="?(.*?[^\\])("|;|$)/
+        ## first, paw through the headers looking for a filename.
+        ## RFC 2183 (Content-Disposition) specifies that disposition-parms are
+        ## separated by ";". So, we match everything up to " and ; (if present).
+        if m.header["Content-Disposition"] && m.header["Content-Disposition"] =~ /filename="?(.*?[^\\])("|;|\z)/m
           $1
-        elsif m.header["Content-Type"] && m.header["Content-Type"] =~ /name="?(.*?[^\\])("|;|$)/i
+        elsif m.header["Content-Type"] && m.header["Content-Type"] =~ /name="?(.*?[^\\])("|;|\z)/im
           $1
 
         ## haven't found one, but it's a non-text message. fake
-- 
1.7.1


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