Make network request return ByteString

[functorrent.git] / src / Tracker.hs

diff --git a/src/Tracker.hs b/src/Tracker.hs
index 75c3a00c09505ab737e34fcdf6f97e912a608a1d..6c558e5798e6df86358a790398bc1f78d15f939a 100644 (file)
--- a/src/Tracker.hs
+++ b/src/Tracker.hs
@@ -1,40 +1,52 @@
 module Tracker where
 
--- import qualified Bencode as Benc
-import qualified Data.ByteString.Char8 as BC
-import qualified Network.HTTP.Base as HB
-import Data.Char
--- import Network.HTTP
+import Prelude hiding (lookup)
 
-type Url = String
+import Bencode (BVal(..), InfoDict, encode)
+import Crypto.Hash.SHA1 (hash)
+import Data.ByteString.Char8 (ByteString, pack, unpack)
+import Data.Char (chr)
+import Data.List (intercalate)
+import Data.Maybe (fromJust)
+import Data.Map as M (Map, (!))
+import Network.HTTP (simpleHTTP, defaultGETRequest_, getResponseBody)
+import Network.HTTP.Base (urlEncode)
+import Network.URI (parseURI)
+import Utils (splitN)
+import qualified Data.ByteString.Base16 as B16 (encode)
 
-splitN :: Int -> BC.ByteString -> [BC.ByteString]
-splitN n bs | BC.null bs = []
-            | otherwise = (BC.take n bs) : splitN n (BC.drop n bs)
+type Url = String
 
--- | urlEncode
+-- | urlEncodeHash
 --
--- >>> urlEncode $ BC.pack "123456789abcdef123456789abcdef123456789a"
+-- >>> urlEncodeHash $ pack "123456789abcdef123456789abcdef123456789a"
 -- "%124Vx%9a%bc%de%f1%23Eg%89%ab%cd%ef%124Vx%9a"
-urlEncode :: BC.ByteString -> String
-urlEncode bs = concatMap (encode . BC.unpack) (splitN 2 bs)
-  where encode b@(c1 : c2 : []) = let c =  chr (read ("0x" ++ b))
-                                  in
-                                   escape c c1 c2
-        encode _ = ""
-        escape i c1 c2 | isAsciiUpper i ||
-                         isAsciiLower i ||
-                         isDigit i ||
-                         i == '-' ||
-                         i == '_' ||
-                         i == '.' ||
-                         i == '~'
-                         = [i]
+urlEncodeHash :: ByteString -> String
+urlEncodeHash bs = concatMap (encode' . unpack) (splitN 2 bs)
+  where encode' b@[c1, c2] = let c =  chr (read ("0x" ++ b))
+                            in escape c c1 c2
+        encode' _ = ""
+        escape i c1 c2 | i `elem` nonSpecialChars = [i]
                        | otherwise = "%" ++ [c1] ++ [c2]
 
--- (chr . read . ("0x" ++) . BC.unpack)
--- connect :: Url -> String -> IO (Benc.BVal)
--- connect url infoHash = case (parseUrl url) of
---                         Nothing -> putStrLn "invalid tracker URL"
---                         Just req -> let 
-              
+        nonSpecialChars = ['A'..'Z'] ++ ['a'..'z'] ++ ['0'..'9'] ++ "-_.~"
+
+infoHash :: Map BVal BVal -> ByteString
+infoHash m = let info = m ! Bstr (pack "info")
+             in (hash . pack . encode) info
+
+prepareRequest :: InfoDict -> String -> Integer -> String
+prepareRequest d peer_id len =
+  let p = [("info_hash", urlEncodeHash ((B16.encode . infoHash) d)),
+           ("peer_id", urlEncode peer_id),
+           ("port", "6881"),
+           ("uploaded", "0"),
+           ("downloaded", "0"),
+           ("left", show len),
+           ("compact", "1"),
+           ("event", "started")]
+  in intercalate "&" [f ++ "=" ++ s | (f,s) <- p]
+
+connect :: Url -> String -> IO ByteString
+connect baseurl qstr = simpleHTTP (defaultGETRequest_ url) >>= getResponseBody
+    where url = fromJust . parseURI $ (baseurl ++ "?" ++ qstr)