commit bab9c14: [Minor] Allow to disable hash trimming in maybe_obfuscate_string

[Anton Yuzhaninov]

Author: Anton Yuzhaninov
Date: 2019-07-01 17:33:24 +0100
URL: https://github.com/rspamd/rspamd/commit/bab9c14b048bee2b33b8f2aa9d5ce4215f0413f7 (refs/pull/2956/head)

[Minor] Allow to disable hash trimming in maybe_obfuscate_string
Don't trim hash if <prefix>_privacy_length is zero.

---
 lualib/lua_util.lua | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lualib/lua_util.lua b/lualib/lua_util.lua
index d1d43564d..e8dc57429 100644
--- a/lualib/lua_util.lua
+++ b/lualib/lua_util.lua
@@ -943,7 +943,7 @@ end
 -- * <prefix>_privacy = false - subject privacy is off
 -- * <prefix>_privacy_alg = 'blake2' - default hash-algorithm to obfuscate subject
 -- * <prefix>_privacy_prefix = 'obf' - prefix to show it's obfuscated
--- * <prefix>_privacy_length = 16 - cut the length of the hash
+-- * <prefix>_privacy_length = 16 - cut the length of the hash; if 0 or fasle full hash is returned
 -- @return obfuscated or validated subject
 --]]
 
@@ -958,7 +958,7 @@ exports.maybe_obfuscate_string = function(subject, settings, prefix)
     local subject_hash = hash.create_specific(hash_alg, subject)
 
     local strip_len = settings[prefix .. '_privacy_length']
-    if strip_len then
+    if strip_len and strip_len > 0 then
       subject = subject_hash:hex():sub(1, strip_len)
     else
       subject = subject_hash:hex()