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[Rakka.git] / Rakka / Utils.hs

diff --git a/Rakka/Utils.hs b/Rakka/Utils.hs
index 9eb667c115971c10d816f0176e8d9bda2b4a1632..15bc6f4043f5a87f149cd09a5147c4cb4cb5be7c 100644 (file)
--- a/Rakka/Utils.hs
+++ b/Rakka/Utils.hs
@@ -1,14 +1,25 @@
 module Rakka.Utils
     ( yesOrNo
+    , trueOrFalse
     , parseYesOrNo
     , maybeA
     , deleteIfEmpty
     , chomp
+    , guessMIMEType
+    , isSafeChar
+    , mkQueryString
     )
     where
 
+import qualified Codec.Binary.UTF8.String as UTF8
 import           Control.Arrow
 import           Control.Arrow.ArrowList
+import qualified Data.ByteString.Lazy as Lazy (ByteString)
+import qualified Data.ByteString.Lazy.Char8 as L8 hiding (ByteString)
+import           Magic
+import           Network.HTTP.Lucu
+import           Network.URI
+import           System.IO.Unsafe
 
 
 yesOrNo :: Bool -> String
@@ -16,6 +27,11 @@ yesOrNo True  = "yes"
 yesOrNo False = "no"
 
 
+trueOrFalse :: Bool -> String
+trueOrFalse True  = "true"
+trueOrFalse False = "false"
+
+
 parseYesOrNo :: ArrowChoice a => a String Bool
 parseYesOrNo 
     = proc str -> do case str of
@@ -41,3 +57,33 @@ deleteIfEmpty
 
 chomp :: String -> String
 chomp = reverse . snd . break (/= '\n') . reverse
+
+
+guessMIMEType :: Lazy.ByteString -> MIMEType
+guessMIMEType = read . unsafePerformIO . magicString magic . L8.unpack
+    where
+      magic :: Magic
+      magic = unsafePerformIO
+              $ do m <- magicOpen [MagicMime]
+                   magicLoadDefault m
+                   return m
+
+
+isSafeChar :: Char -> Bool
+isSafeChar c
+    | c == '/'            = True
+    | isReserved c        = False
+    | c > ' ' && c <= '~' = True
+    | otherwise           = False
+
+
+mkQueryString :: [(String, String)] -> String
+mkQueryString []            = ""
+mkQueryString ((k, v) : xs) = encode k ++ "=" ++ encode v ++
+                              if xs == [] then
+                                  ""
+                              else
+                                  ';' : mkQueryString(xs)
+    where
+      encode :: String -> String
+      encode = escapeURIString isSafeChar . UTF8.encodeString
\ No newline at end of file