+{-
+ - Copyright (C) 2015-2016 Ramakrishnan Muthukrishnan <ram@rkrishnan.org>
+ -
+ - This file is part of FuncTorrent.
+ -
+ - FuncTorrent is free software; you can redistribute it and/or modify
+ - it under the terms of the GNU General Public License as published by
+ - the Free Software Foundation; either version 3 of the License, or
+ - (at your option) any later version.
+ -
+ - FuncTorrent is distributed in the hope that it will be useful,
+ - but WITHOUT ANY WARRANTY; without even the implied warranty of
+ - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ - GNU General Public License for more details.
+ -
+ - You should have received a copy of the GNU General Public License
+ - along with FuncTorrent; if not, see <http://www.gnu.org/licenses/>
+ -}
+
module FuncTorrent.Metainfo
- (Info,
- Metainfo,
- mkMetaInfo,
- mkInfo,
- announce,
- lengthInBytes,
- info,
- name
+ (Info(..),
+ Metainfo(..),
+ torrentToMetainfo
) where
import Prelude hiding (lookup)
import Data.ByteString.Char8 (ByteString, unpack)
import Data.Map as M ((!), lookup)
+import Crypto.Hash.SHA1 (hash)
+import Data.Maybe (maybeToList)
-import FuncTorrent.Bencode (BVal(..))
+import FuncTorrent.Bencode (BVal(..), encode, decode, bstrToString, bValToInteger)
-- only single file mode supported for the time being.
data Info = Info { pieceLength :: !Integer
} deriving (Eq, Show)
data Metainfo = Metainfo { info :: !Info
- , announce :: !String
- , announceList :: !(Maybe [[String]])
- , creationDate :: !(Maybe String)
+ , announceList :: ![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 Nothing = Nothing
-maybeBstrToString (Just s) = let (Bstr bs) = s
- in Just (unpack bs)
+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 = []
+getAnnounceList (Just (Bint _)) = []
+getAnnounceList (Just (Bstr _)) = []
+getAnnounceList (Just (Blist l)) = map (\s -> case s of
+ (Bstr s') -> unpack s'
+ (Blist s') -> case s' of
+ [Bstr s''] -> unpack s''
+ _ -> ""
+ _ -> "") l
+getAnnounceList (Just (Bdict _)) = []
-mkMetaInfo :: BVal -> Maybe Metainfo
-mkMetaInfo (Bdict m) = let (Just info') = mkInfo $ m ! "info"
- (Bstr announce') = m ! "announce"
- -- announceList = lookup (Bstr (pack "announce list"))
- announceList' = Nothing
- -- 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'
- , announce = unpack announce'
- , announceList = announceList'
- , creationDate = creationDate'
- , comment = maybeBstrToString comment'
- , createdBy = maybeBstrToString createdBy'
- , encoding = maybeBstrToString encoding'
- }
-mkMetaInfo _ = Nothing
+torrentToMetainfo :: ByteString -> Either String Metainfo
+torrentToMetainfo s =
+ case decode s of
+ Right d -> mkMetaInfo d
+ Left e -> Left $ show e