From: Thomas Oettli <spacefreak@noop.ch>
Date: Mon, 15 Apr 2019 15:34:42 +0000 (+0200)
Subject: [Minor] mime_types: decode hex encoded characters
X-Git-Tag: 1.9.2~9^2~1
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=0e20e00c8d53433507f178098c17d152d754de78;p=thirdparty%2Frspamd.git

[Minor] mime_types: decode hex encoded characters
in filenames to improve file extension detection
---

diff --git a/src/plugins/lua/mime_types.lua b/src/plugins/lua/mime_types.lua
index c898540c09..1141047a27 100644
--- a/src/plugins/lua/mime_types.lua
+++ b/src/plugins/lua/mime_types.lua
@@ -851,6 +851,9 @@ local function check_mime_type(task)
               fname:sub(1, ch_pos)))
     end
 
+    -- Decode hex encoded characters
+    fname = string.gsub(fname, '%%(%x%x)', function (hex) return string.char(tonumber(hex,16)) end )
+
     -- Replace potentially bad characters with '?'
     fname = fname:gsub('[^%s%g]', '?')