-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)
+-- | Make arguments that should be posted to tracker.
+-- This is a separate pure function for testability.
+mkArgs :: Metainfo -> String -> [(String, ByteString)]
+mkArgs m peer_id = [("info_hash", pack . urlEncodeHash . B16.encode . infoHash $ m),
+ ("peer_id", pack . urlEncode $ peer_id),
+ ("port", "6881"),
+ ("uploaded", "0"),
+ ("downloaded", "0"),
+ ("left", pack . show . lengthInBytes $ info m),
+ ("compact", "1"),
+ ("event", "started")]
+
+-- | Make a query string from a alist of k, v
+-- TODO: Url encode each argument
+mkParams :: [(String, ByteString)] -> ByteString
+mkParams params = BC.intercalate "&" [concat [pack f, "=", s] | (f,s) <- params]
+
+get :: String -> [(String, ByteString)] -> IO ByteString
+get url args = simpleHTTP (defaultGETRequest_ url') >>= getResponseBody
+ where url' = case parseURI $ unpack $ concat [pack url, "?", qstr] of
+ Just x -> x
+ _ -> error "Bad tracker URL"
+ qstr = mkParams args