3 import qualified Data.ByteString.Char8 as BC
4 import qualified Data.Map as M
5 import qualified Data.List as List
6 import qualified Network.HTTP as HTTP
7 import qualified Bencode as Benc
8 import qualified Crypto.Hash.SHA1 as SHA1
9 import qualified Data.ByteString.Base16 as B16
10 import qualified Utils as U
12 -- import Network.HTTP
19 -- >>> urlEncode $ BC.pack "123456789abcdef123456789abcdef123456789a"
20 -- "%124Vx%9a%bc%de%f1%23Eg%89%ab%cd%ef%124Vx%9a"
21 urlEncode :: BC.ByteString -> String
22 urlEncode bs = concatMap (encode . BC.unpack) (U.splitN 2 bs)
23 where encode b@[c1, c2] = let c = chr (read ("0x" ++ b))
27 escape i c1 c2 | i `elem` nonSpecialChars = [i]
28 | otherwise = "%" ++ [c1] ++ [c2]
29 where nonSpecialChars = ['A'..'Z'] ++
34 infoHash :: M.Map Benc.BVal Benc.BVal -> BC.ByteString
35 infoHash m = let info = m M.! Benc.Bstr (BC.pack "info")
36 in (B16.encode . SHA1.hash . BC.pack . Benc.encode) info
38 peerHash :: String -> BC.ByteString
39 peerHash = B16.encode . SHA1.hash . BC.pack
41 prepareRequest :: Benc.BVal -> String -> Integer -> String
42 prepareRequest (Benc.Bdict d) peer_id len =
43 let p = [("info_hash", urlEncode (infoHash d)),
44 ("peer_id", urlEncode (peerHash peer_id)),
52 List.intercalate "&" [f ++ "=" ++ s | (f,s) <- p]
54 connect :: Url -> String -> IO String
55 connect baseurl qstr = let url = baseurl ++ "?" ++ qstr
56 in HTTP.simpleHTTP (HTTP.getRequest url) >>=