1 files changed, 33 insertions, 0 deletions
diff --git a/Codec/MIME/Utils.hs b/Codec/MIME/Utils.hs
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+++ b/Codec/MIME/Utils.hs
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+--------------------------------------------------------------------
+-- |
+-- Module    : Codec.MIME.Utils
+-- Copyright : (c) 2006-2009, Galois, Inc. 
+-- License   : BSD3
+--
+-- Maintainer: Sigbjorn Finne <sigbjorn.finne@gmail.com>
+-- Stability : provisional
+-- Portability: portable
+--
+-- Extracting content from MIME values and types.
+-- 
+--------------------------------------------------------------------
+module Codec.MIME.Utils
+  ( findMultipartNamed -- :: String -> MIMEValue -> Maybe MIMEValue
+  )  where
+
+import Codec.MIME.Type
+import Data.List ( find )
+import Control.Monad ( msum )
+import Data.Text(Text)
+
+-- | Given a parameter name, locate it within a MIME value,
+-- returning the corresponding (sub) MIME value.
+findMultipartNamed :: Text -> MIMEValue -> Maybe MIMEValue
+findMultipartNamed nm mv =
+ case mime_val_content mv of
+   Multi ms  -> msum (map (findMultipartNamed nm) ms)
+   Single {} -> do cd <- mime_val_disp mv
+                   _ <- find (withDispName nm) (dispParams cd)
+                   return mv
+ where withDispName a (Name b) = a == b
+       withDispName _ _ = False