From d5725cac044cc46245edc209e7c61c717e0d23db Mon Sep 17 00:00:00 2001 From: Mark Longair Date: Mon, 3 Jun 2013 15:11:05 +0100 Subject: Fix for subject lines with invalid UTF-8 as the last character This seems to be the bug mentioned here: http://po-ru.com/diary/fixing-invalid-utf-8-in-ruby-revisited/ That explains that some versions of Iconv don't ignore invalid characters when converting to UTF-8 even with //IGNORE if that invalid character happens to be at the end of the string. In fact, as Matthew Somerville pointed out, with some versions of iconv (e.g. 1.14 on Mac OS, apparently) it's necessary to add and remove more than one space at the end, in case the first character of the byte sequence indicates a long sequence. We add and remove 4 to be on the safe side. --- lib/mail_handler/backends/mail_extensions.rb | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) (limited to 'lib/mail_handler/backends/mail_extensions.rb') diff --git a/lib/mail_handler/backends/mail_extensions.rb b/lib/mail_handler/backends/mail_extensions.rb index d25012e39..54599639b 100644 --- a/lib/mail_handler/backends/mail_extensions.rb +++ b/lib/mail_handler/backends/mail_extensions.rb @@ -73,7 +73,12 @@ module Mail if match encoding = match[1] str = Ruby18.decode_base64(match[2]) - str = Iconv.conv('UTF-8//IGNORE', fix_encoding(encoding), str) + # Adding and removing trailing spaces is a workaround + # for Iconv.conv throwing an exception if it finds an + # invalid character at the end of the string, even + # with UTF-8//IGNORE: + # http://po-ru.com/diary/fixing-invalid-utf-8-in-ruby-revisited/ + str = Iconv.conv('UTF-8//IGNORE', fix_encoding(encoding), str + " ")[0...-4] end str end @@ -86,7 +91,12 @@ module Mail # Remove trailing = if it exists in a Q encoding string = string.sub(/\=$/, '') str = Encodings::QuotedPrintable.decode(string) - str = Iconv.conv('UTF-8//IGNORE', fix_encoding(encoding), str) + # Adding and removing trailing spaces is a workaround + # for Iconv.conv throwing an exception if it finds an + # invalid character at the end of the string, even + # with UTF-8//IGNORE: + # http://po-ru.com/diary/fixing-invalid-utf-8-in-ruby-revisited/ + str = Iconv.conv('UTF-8//IGNORE', fix_encoding(encoding), str + " ")[0...-4] end str end -- cgit v1.2.3