diff --git a/Text/Webrexp/IOMock.hs b/Text/Webrexp/IOMock.hs
new file mode 100644
--- /dev/null
+++ b/Text/Webrexp/IOMock.hs
@@ -0,0 +1,19 @@
+{-# LANGUAGE FlexibleInstances #-}
+module Text.Webrexp.IOMock ( IOMockable( .. ) ) where
+
+import Control.Monad.ST
+import Control.Applicative( (<$>) )
+
+-- | Mocking IO, to let the software use IO actions normally,
+-- and get back Nothing in case of non-authorization (like if
+-- we want the code to stay in ST to be embeddable). Effectively
+-- implement a form of sandboxing.
+class IOMockable m where
+    performIO :: IO a -> m (Maybe a)
+
+instance IOMockable IO where
+    performIO a = Just <$> a
+
+instance IOMockable (ST s) where
+    performIO _ = return Nothing
+
diff --git a/Webrexp.cabal b/Webrexp.cabal
--- a/Webrexp.cabal
+++ b/Webrexp.cabal
@@ -1,5 +1,5 @@
 Name:       Webrexp
-Version:    1.1.1
+Version:    1.1.2
 Synopsis:   Regexp-like engine to scrap web data
 Build-Type: Simple
 License:    BSD3
@@ -9,6 +9,15 @@
 Author: Vincent Berthoux
 Maintainer: Vincent Berthoux (twinside@gmail.com)
 
+Source-Repository head
+    Type:      git
+    Location:  git@github.com:Twinside/Webrexp.git
+
+Source-Repository this
+    Type:      git
+    Location:  git@github.com:Twinside/Webrexp.git
+    Tag:       v1.1.2
+
 Flag optimize
     Description: turn on optimisation
     Default: False
@@ -59,6 +68,7 @@
             Text.Webrexp.Eval.ActionFunc
             Text.Webrexp.HaXmlNode
             Text.Webrexp.HxtNode
+            Text.Webrexp.IOMock
             Text.Webrexp.JsonNode
             Text.Webrexp.ProjectByteString
             Text.Webrexp.Remote.MimeTypes