X-Git-Url: http://andersk.mit.edu/gitweb/scripts-static-cat.git/blobdiff_plain/59962b4ac6b131aec2940ccfa1fa0735f7a0445d..6d268c6bee974a197eee5753450829c65316015a:/StaticCat.hs diff --git a/StaticCat.hs b/StaticCat.hs index f7e4ad8..456e6c1 100644 --- a/StaticCat.hs +++ b/StaticCat.hs @@ -1,11 +1,14 @@ {-# LANGUAGE DeriveDataTypeable, ViewPatterns #-} {-# OPTIONS_GHC -O2 -Wall #-} +import Prelude hiding (catch) import Control.Applicative -import Control.Exception import Control.Monad +import Control.Monad.CatchIO import qualified Data.ByteString.Lazy as B +import Data.Char import Data.Dynamic +import Data.Int import qualified Data.Map as M import Data.Time.Clock.POSIX import Data.Time.Format @@ -13,31 +16,99 @@ import Network.CGI import Numeric import System.FilePath import System.IO -import System.IO.Error +import System.IO.Error (isDoesNotExistError, isPermissionError) +import System.IO.Unsafe import System.Locale import System.Posix import System.Posix.Handle encodings :: M.Map String String encodings = M.fromList [ + (".bz2", "bzip2"), (".gz", "gzip"), - (".bz2", "bzip2") + (".z", "compress") ] types :: M.Map String String types = M.fromList [ - (".html", "text/html") + (".avi", "video/x-msvideo"), + (".css", "text/css"), + (".doc", "application/msword"), + (".docm", "application/vnd.ms-word.document.macroEnabled.12"), + (".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"), + (".dot", "application/msword"), + (".dotm", "application/vnd.ms-word.template.macroEnabled.12"), + (".dotx", "application/vnd.openxmlformats-officedocument.wordprocessingml.template"), + (".gif", "image/gif"), + (".htm", "text/html"), + (".html", "text/html"), + (".ico", "image/vnd.microsoft.icon"), + (".il", "application/octet-stream"), + (".jar", "application/java-archive"), + (".jpeg", "image/jpeg"), + (".jpg", "image/jpeg"), + (".js", "application/x-javascript"), + (".mid", "audio/midi"), + (".midi", "audio/midi"), + (".mov", "video/quicktime"), + (".mp3", "audio/mpeg"), + (".mpeg", "video/mpeg"), + (".mpg", "video/mpeg"), + (".odb", "application/vnd.oasis.opendocument.database"), + (".odc", "application/vnd.oasis.opendocument.chart"), + (".odf", "application/vnd.oasis.opendocument.formula"), + (".odg", "application/vnd.oasis.opendocument.graphics"), + (".odi", "application/vnd.oasis.opendocument.image"), + (".odm", "application/vnd.oasis.opendocument.text-master"), + (".odp", "application/vnd.oasis.opendocument.presentation"), + (".ods", "application/vnd.oasis.opendocument.spreadsheet"), + (".odt", "application/vnd.oasis.opendocument.text"), + (".otf", "application/octet-stream"), + (".otg", "application/vnd.oasis.opendocument.graphics-template"), + (".oth", "application/vnd.oasis.opendocument.text-web"), + (".otp", "application/vnd.oasis.opendocument.presentation-template"), + (".ots", "application/vnd.oasis.opendocument.spreadsheet-template"), + (".ott", "application/vnd.oasis.opendocument.text-template"), + (".pdf", "application/pdf"), + (".png", "image/png"), + (".pot", "application/vnd.ms-powerpoint"), + (".potm", "application/vnd.ms-powerpoint.template.macroEnabled.12"), + (".potx", "application/vnd.openxmlformats-officedocument.presentationml.template"), + (".ppa", "application/vnd.ms-powerpoint"), + (".ppam", "application/vnd.ms-powerpoint.addin.macroEnabled.12"), + (".pps", "application/vnd.ms-powerpoint"), + (".ppsm", "application/vnd.ms-powerpoint.slideshow.macroEnabled.12"), + (".ppsx", "application/vnd.openxmlformats-officedocument.presentationml.slideshow"), + (".ppt", "application/vnd.ms-powerpoint"), + (".pptm", "application/vnd.ms-powerpoint.presentation.macroEnabled.12"), + (".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"), + (".ps", "application/postscript"), + (".svg", "image/svg+xml"), + (".swf", "application/x-shockwave-flash"), + (".tar", "application/x-tar"), + (".tgz", "application/x-gzip"), + (".tif", "image/tiff"), + (".tiff", "image/tiff"), + (".ttf", "application/octet-stream"), + (".wav", "audio/x-wav"), + (".wmv", "video/x-ms-wmv"), + (".xaml", "application/xaml+xml"), + (".xap", "application/x-silverlight-app"), + (".xhtml", "application/xhtml+xml"), + (".xla", "application/vnd.ms-excel"), + (".xlam", "application/vnd.ms-excel.addin.macroEnabled.12"), + (".xls", "application/vnd.ms-excel"), + (".xlsb", "application/vnd.ms-excel.sheet.binary.macroEnabled.12"), + (".xlsm", "application/vnd.ms-excel.sheet.macroEnabled.12"), + (".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"), + (".xlt", "application/vnd.ms-excel"), + (".xltm", "application/vnd.ms-excel.template.macroEnabled.12"), + (".xltx", "application/vnd.openxmlformats-officedocument.spreadsheetml.template"), + (".xml", "text/xml"), + (".xsl", "text/xml"), + (".zip", "application/zip") ] -throwExceptionCGI :: Exception e => e -> CGI a -throwExceptionCGI = throwCGI . toException - -catchExceptionCGI :: Exception e => CGI a -> (e -> CGI a) -> CGI a -a `catchExceptionCGI` handler = - a `catchCGI` \e -> case fromException e of - Nothing -> throwCGI e - Just e_ -> handler e_ - data MyError = NotModified | Forbidden | NotFound | BadMethod | BadRange deriving (Show, Typeable) @@ -53,14 +124,14 @@ outputMyError BadRange = outputError 416 "Requested Range Not Satisfiable" [] checkExtension :: FilePath -> CGI () checkExtension file = do let (base, ext) = splitExtension file - ext' <- case M.lookup ext encodings of + ext' <- case M.lookup (map toLower ext) encodings of Nothing -> return ext Just e -> do setHeader "Content-Encoding" e return $ takeExtension base - case M.lookup ext' types of - Nothing -> throwExceptionCGI Forbidden + case M.lookup (map toLower ext') types of + Nothing -> throw Forbidden Just t -> setHeader "Content-Type" t checkMethod :: CGI CGIResult -> CGI CGIResult @@ -70,7 +141,7 @@ checkMethod rOutput = do "HEAD" -> rOutput >> outputNothing "GET" -> rOutput "POST" -> rOutput - _ -> throwExceptionCGI BadMethod + _ -> throw BadMethod httpDate :: String httpDate = "%a, %d %b %Y %H:%M:%S %Z" @@ -85,7 +156,7 @@ checkModified :: EpochTime -> CGI () checkModified mTime = do setHeader "Last-Modified" $ formatHTTPDate mTime (requestHeader "If-Modified-Since" >>=) $ maybe (return ()) $ \ims -> - when (parseHTTPDate ims >= Just mTime) $ throwExceptionCGI NotModified + when (parseHTTPDate ims >= Just mTime) $ throw NotModified checkIfRange :: EpochTime -> CGI (Maybe ()) checkIfRange mTime = do @@ -93,10 +164,12 @@ checkIfRange mTime = do return $ if parseHTTPDate ir == Just mTime then Just () else Nothing parseRange :: String -> FileOffset -> Maybe (FileOffset, FileOffset) +parseRange (splitAt 6 -> ("bytes=", '-':(readDec -> [(len, "")]))) size = + Just (max 0 (size - len), size - 1) parseRange (splitAt 6 -> ("bytes=", readDec -> [(a, "-")])) size = Just (a, size - 1) -parseRange (splitAt 6 -> ("bytes=", readDec -> [(a, '-':(readDec -> [(b, "")]))])) _ = - Just (a, b) +parseRange (splitAt 6 -> ("bytes=", readDec -> [(a, '-':(readDec -> [(b, "")]))])) size = + Just (a, min (size - 1) b) parseRange _ _ = Nothing checkRange :: EpochTime -> FileOffset -> CGI (Maybe (FileOffset, FileOffset)) @@ -106,40 +179,54 @@ checkRange mTime size = do (checkIfRange mTime >>=) $ maybe (return Nothing) $ \() -> do case parseRange range size of Just (a, b) | a <= b -> return $ Just (a, b) - _ -> throwExceptionCGI BadRange + Just _ -> throw BadRange + Nothing -> return Nothing + +outputAll :: Handle -> FileOffset -> CGI CGIResult +outputAll h size = do + setHeader "Content-Length" $ show size + outputFPS =<< liftIO (B.hGetContents h) + +-- | Lazily read a given number of bytes from the handle into a +-- 'ByteString', then close the handle. +hGetClose :: Handle -> Int64 -> IO B.ByteString +hGetClose h len = do + contents <- B.hGetContents h + end <- unsafeInterleaveIO (hClose h >> return B.empty) + return (B.append (B.take len contents) end) + +outputRange :: Handle -> FileOffset -> Maybe (FileOffset, FileOffset) -> CGI CGIResult +outputRange h size Nothing = outputAll h size +outputRange h size (Just (a, b)) = do + let len = b - a + 1 + + setStatus 206 "Partial Content" + setHeader "Content-Range" $ + "bytes " ++ show a ++ "-" ++ show b ++ "/" ++ show size + setHeader "Content-Length" $ show len + liftIO $ hSeek h AbsoluteSeek (fromIntegral a) + outputFPS =<< liftIO (hGetClose h (fromIntegral len)) serveFile :: FilePath -> CGI CGIResult -serveFile file = (`catchExceptionCGI` outputMyError) $ do +serveFile file = (`catch` outputMyError) $ do checkExtension file checkMethod $ do - h <- (`catchExceptionCGI` \e -> - if isDoesNotExistError e then throwExceptionCGI NotFound - else if isPermissionError e then throwExceptionCGI Forbidden - else throwExceptionCGI e) $ - liftIO $ openBinaryFile file ReadMode - (`catchCGI` \e -> - (liftIO $ hClose h) >> throwCGI e) $ do + let handleOpenError e = + if isDoesNotExistError e then throw NotFound + else if isPermissionError e then throw Forbidden + else throw e + h <- liftIO (openBinaryFile file ReadMode) `catch` handleOpenError + (`onException` liftIO (hClose h)) $ do status <- liftIO $ hGetStatus h let mTime = modificationTime status size = fileSize status checkModified mTime - checkRange mTime size >>= maybe - (do - setHeader "Content-Length" $ show size - outputFPS =<< (liftIO $ B.hGetContents h)) - (\(a, b) -> do - let len = b - a + 1 - - setStatus 206 "Partial Content" - setHeader "Content-Range" $ - "bytes " ++ show a ++ "-" ++ show b ++ "/" ++ show size - setHeader "Content-Length" $ show len - liftIO $ hSeek h AbsoluteSeek (fromIntegral a) - outputFPS =<< (liftIO $ B.hGet h (fromIntegral len))) + range <- checkRange mTime size + outputRange h size range main :: IO () main = runCGI $ handleErrors $ serveFile =<< pathTranslated