module Debian.URI
( module Network.URI
, URIString
, uriToString'
, fileFromURI
, fileFromURIStrict
, dirFromURI
) where
import Control.Exception (ErrorCall(ErrorCall), try)
import qualified Data.ByteString.Lazy.Char8 as L
import qualified Data.ByteString as B
import Data.Maybe (catMaybes)
import Network.URI
import System.Directory (getDirectoryContents)
import System.Exit
import System.Unix.Process (lazyCommand, collectOutput)
import Text.Regex (mkRegex, matchRegex)
uriToString' uri = uriToString id uri ""
instance Ord URI where
compare a b = compare (uriToString' a) (uriToString' b)
type URIString = String
fileFromURI :: URI -> IO (Either ErrorCall L.ByteString)
fileFromURI uri =
case (uriScheme uri, uriAuthority uri) of
("file:", Nothing) -> try (L.readFile (uriPath uri))
("ssh:", Just auth) -> cmdOutput ("ssh " ++ uriUserInfo auth ++ uriRegName auth ++ uriPort auth ++
" cat " ++ show (uriPath uri))
_ -> cmdOutput ("curl -s -g '" ++ uriToString' uri ++ "'")
fileFromURIStrict :: URI -> IO (Either ErrorCall B.ByteString)
fileFromURIStrict uri =
case (uriScheme uri, uriAuthority uri) of
("file:", Nothing) -> try (B.readFile (uriPath uri))
("ssh:", Just auth) -> cmdOutputStrict ("ssh " ++ uriUserInfo auth ++ uriRegName auth ++ uriPort auth ++
" cat " ++ show (uriPath uri))
_ -> cmdOutputStrict ("curl -s -g '" ++ uriToString' uri ++ "'")
webServerDirectoryContents :: L.ByteString -> [String]
webServerDirectoryContents text =
catMaybes . map (second . matchRegex re) . lines . L.unpack $ text
where
re = mkRegex "( <A HREF|<a href)=\"([^/][^\"]*)/\""
second (Just [_, b]) = Just b
second _ = Nothing
dirFromURI :: URI -> IO (Either ErrorCall [String])
dirFromURI uri =
case (uriScheme uri, uriAuthority uri) of
("file:", Nothing) -> try (getDirectoryContents (uriPath uri))
("ssh:", Just auth) -> cmdOutput ("ssh " ++ uriUserInfo auth ++ uriRegName auth ++ uriPort auth ++
" ls -1 " ++ uriPath uri) >>=
return . either Left (Right . lines . L.unpack)
_ -> cmdOutput ("curl -s -g '" ++ uriToString' uri ++ "/'") >>= return . either Left (Right . webServerDirectoryContents)
cmdOutput :: String -> IO (Either ErrorCall L.ByteString)
cmdOutput cmd =
do (out, _err, code) <- lazyCommand cmd L.empty >>= return . collectOutput
case code of
(ExitSuccess : _) -> return (Right out)
(ExitFailure _ : _) -> return . Left . ErrorCall $ "Failure: " ++ show cmd
[] -> return . Left . ErrorCall $ "Failure: no exit code"
cmdOutputStrict :: String -> IO (Either ErrorCall B.ByteString)
cmdOutputStrict cmd =
do (out, _err, code) <- lazyCommand cmd L.empty >>= return . f . collectOutput
case code of
(ExitSuccess : _) -> return (Right out)
(ExitFailure _ : _) -> return . Left . ErrorCall $ "Failure: " ++ show cmd
[] -> return . Left . ErrorCall $ "Failure: no exit code"
where
f :: (L.ByteString, L.ByteString, [ExitCode]) -> (B.ByteString, B.ByteString, [ExitCode])
f (o, e, c) = (toStrict o, toStrict e, c)
toLazy :: B.ByteString -> L.ByteString
toLazy b = L.fromChunks [b]
toStrict :: L.ByteString -> B.ByteString
toStrict b = B.concat (L.toChunks b)