- along with FuncTorrent; if not, see <http://www.gnu.org/licenses/>
-}
+{-# LANGUAGE OverloadedStrings #-}
module FuncTorrent.Metainfo
(Info(..),
Metainfo(..),
- mkInfo,
torrentToMetainfo
) where
import Prelude hiding (lookup)
import Data.ByteString.Char8 (ByteString, unpack)
import Data.Map as M ((!), lookup)
+import Data.List (intersperse)
import Crypto.Hash.SHA1 (hash)
import Data.Maybe (maybeToList)
import FuncTorrent.Bencode (BVal(..), encode, decode, bstrToString, bValToInteger)
--- only single file mode supported for the time being.
+data FileMeta = FileMeta { lengthInBytes :: !Integer
+ , md5sum :: !(Maybe String)
+ , path :: String
+ } deriving (Eq, Show)
+
data Info = Info { pieceLength :: !Integer
, pieces :: !ByteString
, private :: !(Maybe Integer)
, name :: !String
- , lengthInBytes :: !Integer
- , md5sum :: !(Maybe String)
+ , filemeta :: [FileMeta]
} deriving (Eq, Show)
-data Metainfo = Metainfo { info :: !Info
+data Metainfo = Metainfo { info :: !(Maybe Info)
, announceList :: ![String]
, creationDate :: !(Maybe Integer)
, comment :: !(Maybe String)
, infoHash :: !ByteString
} deriving (Eq, Show)
-mkInfo :: BVal -> Maybe Info
-mkInfo (Bdict m) = let (Bint pieceLength') = m ! "piece length"
- (Bstr pieces') = m ! "pieces"
- private' = Nothing
- (Bstr name') = m ! "name"
- (Bint length') = m ! "length"
- md5sum' = Nothing
- in Just Info { pieceLength = pieceLength'
- , pieces = pieces'
- , private = private'
- , name = unpack name'
- , lengthInBytes = length'
- , md5sum = md5sum'}
-mkInfo _ = Nothing
+bvalToInfo :: BVal -> Maybe Info
+bvalToInfo (Bdict m) = let (Bint pieceLength') = m ! "piece length"
+ (Bstr pieces') = m ! "pieces"
+ private' = Nothing
+ (Bstr name') = m ! "name"
+ -- is the key "files" present? If so, it is a multi-file torrent
+ -- if not, it is a single file torrent.
+ filesIfMulti = lookup "files" m
+ partialInfo = Info { pieceLength = pieceLength'
+ , pieces = pieces'
+ , private = private'
+ , name = unpack name'
+ , filemeta = []
+ }
+ in
+ case filesIfMulti of
+ Nothing -> let (Bint length') = m ! "length"
+ filemeta' = FileMeta { lengthInBytes = length'
+ , md5sum = Nothing
+ , path = unpack name' }
+ in Just (partialInfo { filemeta = [filemeta'] })
+ Just (Blist files) -> mapM toFileMeta files >>=
+ \filemeta' ->
+ Just partialInfo { filemeta = filemeta' }
+bvalToInfo _ = Nothing
+
+toFileMeta :: BVal -> Maybe FileMeta
+toFileMeta (Bdict fm) = let (Bint length) = fm ! "length"
+ (Blist pathElems) = fm ! "path"
+ pathStrings = fmap bstrToString pathElems
+ in
+ sequence pathStrings >>=
+ \pathList -> let path' = concat $ intersperse "/" pathList
+ in Just (FileMeta { lengthInBytes = length
+ , md5sum = Nothing
+ , path = path' })
+toFileMeta _ = Nothing
mkMetaInfo :: BVal -> Either String Metainfo
mkMetaInfo (Bdict m) =
- let (Just info') = mkInfo $ m ! "info"
+ let info' = bvalToInfo $ m ! "info"
announce' = lookup "announce" m
announceList' = lookup "announce-list" m
creationDate' = lookup "creation date" m