[sup-talk] [PATCH] detect and set charset on text/* attachments

From: Helge Titlestad <helgedt@tihlde.org>
To: sup-talk <sup-talk@rubyforge.org>
Subject: [sup-talk] [PATCH] detect and set charset on text/* attachments
Date: Mon, 19 Oct 2009 16:07:26 +0200	[thread overview]
Message-ID: <1255961127-sup-3168@tihlde.org> (raw)

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I got some feedback from non-suppers that my utf-8 text attachments were
messed up. When I checked they (the MIME headers) lacked any info on charset,
which I believe should be set for text/*.

Here's a patch that uses the chardet gem to (try to) detect the appropriate charset
and sets it in the Content-Type header.

Can't guarantee its robustness - have only tried on a couple of text files and
one non-text file.

Please tell me if I should use some different way of sending patches... This git
flow is a bit new to me. (=
-- 
alge

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From 735a5ceb757599af71702d4ece8d29cb11f2c65b Mon Sep 17 00:00:00 2001
From: Helge Titlestad <helgedt@tihlde.org>
Date: Mon, 19 Oct 2009 16:03:56 +0200
Subject: [PATCH] Detect charset for text/* file attachments.

Adds dependency on chardet gem, and uses it to detect the charset.
---
 README.txt      |    1 +
 Rakefile        |    1 +
 lib/sup/util.rb |    8 +++++++-
 3 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/README.txt b/README.txt
index 4204270..3a98fa3 100644
--- a/README.txt
+++ b/README.txt
@@ -106,6 +106,7 @@ Current limitations which will be fixed:
  - mime-types
  - gettext
  - fastthread
+ - chardet
 
 == INSTALL:
 
diff --git a/Rakefile b/Rakefile
index 67cd0d2..3fb0d5e 100644
--- a/Rakefile
+++ b/Rakefile
@@ -57,6 +57,7 @@ spec = Gem::Specification.new do |s|
   s.add_dependency "mime-types", "~> 1"
   s.add_dependency "gettext"
   s.add_dependency "fastthread"
+  s.add_dependency "chardet", ">= 0.9.0"
 end
 
 Rake::GemPackageTask.new(spec) do |pkg|
diff --git a/lib/sup/util.rb b/lib/sup/util.rb
index f99e1c1..ef7b892 100644
--- a/lib/sup/util.rb
+++ b/lib/sup/util.rb
@@ -3,6 +3,7 @@ require 'lockfile'
 require 'mime/types'
 require 'pathname'
 require 'set'
+require 'UniversalDetector'
 
 ## time for some monkeypatching!
 class Lockfile
@@ -71,8 +72,13 @@ module RMail
 
     def self.make_attachment payload, mime_type, encoding, filename
       a = Message.new
+
+      cs = UniversalDetector::chardet(payload)['encoding'] if mime_type =~ /^text\//i
+      ct = "#{mime_type}; name=#{filename.inspect}"
+      ct += "; charset=#{cs}" if cs
+      
       a.header.add "Content-Disposition", "attachment; filename=#{filename.inspect}"
-      a.header.add "Content-Type", "#{mime_type}; name=#{filename.inspect}"
+      a.header.add "Content-Type", ct
       a.header.add "Content-Transfer-Encoding", encoding if encoding
       a.body =
         case encoding
-- 
1.5.6.5


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