+{-
+ - 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/>
+ -}
+
+{-# LANGUAGE DuplicateRecordFields #-}
+
module FuncTorrent.Metainfo
- (Info(..),
- Metainfo(..),
- infoHash,
- mkInfo,
- mkMetaInfo
+ (Info(..)
+ , Metainfo(..)
+ , FileInfo(..)
+ , torrentToMetainfo
) where
import Prelude hiding (lookup)
import Data.ByteString.Char8 (ByteString, unpack)
import Data.Map as M ((!), lookup)
+import Data.List (intercalate)
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
, pieces :: !ByteString
, private :: !(Maybe Integer)
- , name :: !String
- , lengthInBytes :: !Integer
- , md5sum :: !(Maybe String)
+ , files :: ![FileInfo]
} deriving (Eq, Show)
+data FileInfo = FileInfo { lengthInBytes :: Integer
+ , md5sum :: Maybe String
+ , path :: String
+ } deriving (Eq, Show)
+
data Metainfo = Metainfo { info :: !Info
, announceList :: ![String]
, creationDate :: !(Maybe Integer)
, comment :: !(Maybe String)
, createdBy :: !(Maybe String)
, encoding :: !(Maybe String)
+ , infoHash :: !ByteString
} deriving (Eq, Show)
+mkPath :: String -> [BVal] -> String
+mkPath base xs = base ++ "/" ++ (intercalate "/" $ map (\b -> let (Just s) = bstrToString b in s) xs)
+
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
-
-maybeBstrToString :: Maybe BVal -> Maybe String
-maybeBstrToString (Just (Bstr bs)) = Just $ unpack bs
-maybeBstrToString _ = Nothing
+ bdictfiles = lookup "files" m
+ in
+ case bdictfiles of
+ Just fs -> let (Blist files') = fs
+ (Bstr name') = m ! "name"
+ dname' = unpack name'
+ in
+ Just Info { pieceLength = pieceLength'
+ , pieces = pieces'
+ , private = private'
+ , files =
+ map (\(Bdict f) ->
+ let (Just len') = bValToInteger (f ! "length")
+ (Blist ds) = f ! "path"
+ path' = mkPath dname' ds
+ in
+ FileInfo { lengthInBytes = len',
+ md5sum = Nothing,
+ path = path'
+ })
+ files' }
+ Nothing -> let (Bstr name') = m ! "name"
+ (Bint length') = m ! "length"
+ md5sum' = Nothing
+ in
+ Just Info { pieceLength = pieceLength'
+ , pieces = pieces'
+ , private = private'
+ , files = [ FileInfo {
+ path = unpack name',
+ lengthInBytes = length',
+ md5sum = md5sum'
+ }
+ ]
+ }
-maybeBstrToInteger :: Maybe BVal -> Maybe Integer
-maybeBstrToInteger (Just (Bint bs)) = Just bs
-maybeBstrToInteger _ = Nothing
+mkInfo _ = 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 "creation date" m
- 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 = maybeBstrToInteger 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 = []
-getAnnounceList (Just (Bint _)) = []
-getAnnounceList (Just (Bstr _)) = []
+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 _)) = []
--- | 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
projects / functorrent.git / blobdiff