module FuncTorrent.Metainfo
(Info(..),
Metainfo(..),
- infoHash,
mkInfo,
- mkMetaInfo
+ torrentToMetainfo
) where
import Prelude hiding (lookup)
import Crypto.Hash.SHA1 (hash)
import Data.Maybe (maybeToList)
-import FuncTorrent.Bencode (BVal(..), InfoDict, encode, bstrToString)
+import FuncTorrent.Bencode (BVal(..), encode, decode, bstrToString, bValToInteger)
-- only single file mode supported for the time being.
data Info = Info { pieceLength :: !Integer
data Metainfo = Metainfo { info :: !Info
, announceList :: ![String]
- , creationDate :: !(Maybe String)
+ , creationDate :: !(Maybe Integer)
, comment :: !(Maybe String)
, createdBy :: !(Maybe String)
, encoding :: !(Maybe String)
+ , infoHash :: !ByteString
} deriving (Eq, Show)
mkInfo :: BVal -> Maybe Info
, md5sum = md5sum'}
mkInfo _ = Nothing
-maybeBstrToString :: Maybe BVal -> Maybe String
-maybeBstrToString (Just (Bstr bs)) = Just $ unpack bs
-maybeBstrToString _ = Nothing
-
-mkMetaInfo :: BVal -> Maybe Metainfo
-mkMetaInfo (Bdict m) = let (Just info') = mkInfo $ m ! "info"
- announce' = lookup "announce" m
- announceList' = lookup "announce-list" m
- -- creationDate = lookup (Bstr (pack "creation date")) m
- creationDate' = Nothing
- comment' = lookup "comment" m
- createdBy' = lookup "created by" m
- encoding' = lookup "encoding" m
- in Just Metainfo { info = info'
- , announceList = maybeToList (announce' >>= bstrToString)
- ++ getAnnounceList announceList'
- , creationDate = creationDate'
- , comment = maybeBstrToString comment'
- , createdBy = maybeBstrToString createdBy'
- , encoding = maybeBstrToString encoding'
- }
-mkMetaInfo _ = Nothing
+mkMetaInfo :: BVal -> Either String Metainfo
+mkMetaInfo (Bdict m) =
+ let (Just info') = mkInfo $ m ! "info"
+ announce' = lookup "announce" m
+ announceList' = lookup "announce-list" m
+ creationDate' = lookup "creation date" m
+ comment' = lookup "comment" m
+ createdBy' = lookup "created by" m
+ encoding' = lookup "encoding" m
+ in Right Metainfo {
+ info = info'
+ , announceList = maybeToList (announce' >>= bstrToString)
+ ++ getAnnounceList announceList'
+ , creationDate = bValToInteger =<< creationDate'
+ , comment = bstrToString =<< comment'
+ , createdBy = bstrToString =<< createdBy'
+ , encoding = bstrToString =<< encoding'
+ , infoHash = hash . encode $ (m ! "info")
+ }
+mkMetaInfo _ = Left "mkMetaInfo: expect an input dict"
getAnnounceList :: Maybe BVal -> [String]
getAnnounceList Nothing = []
[Bstr s''] -> unpack s''
_ -> ""
_ -> "") l
-
getAnnounceList (Just (Bdict _)) = []
--- | Info hash is urlencoded 20 byte SHA1 hash of the value of the info key from
--- the Metainfo file. Note that the value will be a bencoded dictionary, given
--- the definition of the info key above. TODO: `Metainfo -> ByteString`
-infoHash :: InfoDict -> ByteString
-infoHash m = hash . encode $ (m ! "info")
+torrentToMetainfo :: ByteString -> Either String Metainfo
+torrentToMetainfo s =
+ case decode s of
+ Right d -> mkMetaInfo d
+ Left e -> Left $ show e