-
-handleStaticFile :: FilePath -> Resource ()
-handleStaticFile path
- = do isFile <- liftIO $ doesFileExist path
- if isFile then
- -- 存在はした。讀めるかどうかは知らない。
- do readable <- liftIO $ fileAccess path True False False
- unless readable
- -- 讀めない
- $ abort Forbidden [] Nothing
-
- -- 讀める
- tag <- liftIO $ generateETagFromFile path
- lastMod <- liftIO $ getModificationTime path
- foundEntity tag lastMod
-
- -- MIME Type を推定
- conf <- getConfig
- case guessTypeByFileName (cnfExtToMIMEType conf) path of
- Nothing -> return ()
- Just mime -> setContentType mime
-
- -- 實際にファイルを讀んで送る
- (liftIO $ B.readFile path) >>= outputBS
- else
- do isDir <- liftIO $ doesDirectoryExist path
- if isDir then
- abort Forbidden [] Nothing
- else
- foundNoEntity Nothing
-
-
--- inode-size-lastmod
-generateETagFromFile :: FilePath -> IO ETag
+octetStream ∷ MIMEType
+octetStream = mkMIMEType "application" "octet-stream"
+
+handleStaticFile ∷ Bool → FilePath → Resource ()
+handleStaticFile sendContent path
+ = do exists ← liftIO $ fileExist path
+ unless exists
+ $ foundNoEntity Nothing
+
+ readable ← liftIO $ fileAccess path True False False
+ unless readable
+ $ abort Forbidden [] Nothing
+
+ stat ← liftIO $ getFileStatus path
+ when (isDirectory stat)
+ $ abort Forbidden [] Nothing
+
+ tag ← liftIO $ generateETagFromFile path
+ let lastMod = posixSecondsToUTCTime
+ $ fromRational
+ $ toRational
+ $ modificationTime stat
+ foundEntity tag lastMod
+
+ conf ← getConfig
+ case guessTypeByFileName (cnfExtToMIMEType conf) path of
+ Nothing → setContentType octetStream
+ Just mime → setContentType mime
+
+ when sendContent
+ $ liftIO (B.readFile path) ≫= putChunk
+
+-- |@'generateETagFromFile' fpath@ generates a strong entity tag from
+-- a file. The file doesn't necessarily have to be a regular file; it
+-- may be a FIFO or a device file. The tag is made of inode ID, size
+-- and modification time.
+--
+-- Note that the tag is not strictly strong because the file could be
+-- modified twice at a second without changing inode ID or size, but
+-- it's not really possible to generate a strictly strong ETag from a
+-- file as we don't want to simply grab the entire file and use it as
+-- an ETag. It is indeed possible to hash it with SHA-1 or MD5 to
+-- increase strictness, but it's too inefficient if the file is really
+-- large (say, 1 TiB).
+generateETagFromFile ∷ FilePath → IO ETag