diff options
Diffstat (limited to 'MIME')
| -rw-r--r-- | MIME/Base64.hs | 141 | ||||
| -rw-r--r-- | MIME/Decode.hs | 56 | ||||
| -rw-r--r-- | MIME/Parse.hs | 241 | ||||
| -rw-r--r-- | MIME/QuotedPrintable.hs | 12 | ||||
| -rw-r--r-- | MIME/Type.hs | 166 | ||||
| -rw-r--r-- | MIME/Utils.hs | 30 |
6 files changed, 0 insertions, 646 deletions
diff --git a/MIME/Base64.hs b/MIME/Base64.hs deleted file mode 100644 index 848e034..0000000 --- a/MIME/Base64.hs +++ /dev/null @@ -1,141 +0,0 @@ -{- | - - Module : MIME.Parse - Copyright : (c) 2006 - - Maintainer : - Stability : unstable - Portability : GHC - - Base64 decoding and encoding routines. --} -module MIME.Base64 - ( encodeRaw -- :: Bool -> String -> [Word8] - , encodeRawString -- :: Bool -> String -> String - , encodeRawPrim -- :: Bool -> Char -> Char -> [Word8] -> String - - , formatOutput -- :: Int -> Maybe String -> String -> String - - , decode -- :: String -> [Word8] - , decodeToString -- :: String -> String - , decodePrim -- :: Char -> Char -> String -> [Word8] - ) where - -import Data.Bits -import Data.Char -import Data.Word -import Data.Maybe - -encodeRawString :: Bool -> String -> String -encodeRawString trail xs = encodeRaw trail (map (fromIntegral.ord) xs) - --- | 'formatOutput n mbLT str' formats 'str', splitting it --- into lines of length 'n'. The optional value lets you control what --- line terminator sequence to use; the default is CRLF (as per MIME.) -formatOutput :: Int -> Maybe String -> String -> String -formatOutput n mbTerm str - | n <= 0 = error ("formatOutput: negative line length " ++ show n) - | otherwise = chop n str - where - crlf :: String - crlf = fromMaybe "\r\n" mbTerm - - chop _ "" = "" - chop i xs = - case splitAt i xs of - (as,"") -> as - (as,bs) -> as ++ crlf ++ chop i bs - -encodeRaw :: Bool -> [Word8] -> String -encodeRaw trail bs = encodeRawPrim trail '+' '/' bs - --- lets you control what non-alphanum characters to use --- (The base64url variation uses '*' and '-', for instance.) --- No support for mapping these to multiple characters in the output though. -encodeRawPrim :: Bool -> Char -> Char -> [Word8] -> String -encodeRawPrim trail ch62 ch63 ls = encoder ls - where - trailer xs ys - | not trail = xs - | otherwise = xs ++ ys - f = fromB64 ch62 ch63 - encoder [] = [] - encoder [x] = trailer (take 2 (encode3 f x 0 0 "")) "==" - encoder [x,y] = trailer (take 3 (encode3 f x y 0 "")) "=" - encoder (x:y:z:ws) = encode3 f x y z (encoder ws) - -encode3 :: (Word8 -> Char) -> Word8 -> Word8 -> Word8 -> String -> String -encode3 f a b c rs = - f (low6 (w24 `shiftR` 18)) : - f (low6 (w24 `shiftR` 12)) : - f (low6 (w24 `shiftR` 6)) : - f (low6 w24) : rs - where - w24 :: Word32 - w24 = (fromIntegral a `shiftL` 16) + - (fromIntegral b `shiftL` 8) + - fromIntegral c - -decodeToString :: String -> String -decodeToString str = map (chr.fromIntegral) $ decode str - -decode :: String -> [Word8] -decode str = decodePrim '+' '/' str - -decodePrim :: Char -> Char -> String -> [Word8] -decodePrim ch62 ch63 str = decoder $ takeUntilEnd str - where - takeUntilEnd "" = [] - takeUntilEnd ('=':_) = [] - takeUntilEnd (x:xs) = - case toB64 ch62 ch63 x of - Nothing -> takeUntilEnd xs - Just b -> b : takeUntilEnd xs - -decoder :: [Word8] -> [Word8] -decoder [] = [] -decoder [x] = take 1 (decode4 x 0 0 0 []) -decoder [x,y] = take 1 (decode4 x y 0 0 []) -- upper 4 bits of second val are known to be 0. -decoder [x,y,z] = take 2 (decode4 x y z 0 []) -decoder (x:y:z:w:xs) = decode4 x y z w (decoder xs) - -decode4 :: Word8 -> Word8 -> Word8 -> Word8 -> [Word8] -> [Word8] -decode4 a b c d rs = - (lowByte (w24 `shiftR` 16)) : - (lowByte (w24 `shiftR` 8)) : - (lowByte w24) : rs - where - w24 :: Word32 - w24 = - (fromIntegral a) `shiftL` 18 .|. - (fromIntegral b) `shiftL` 12 .|. - (fromIntegral c) `shiftL` 6 .|. - (fromIntegral d) - -toB64 :: Char -> Char -> Char -> Maybe Word8 -toB64 a b ch - | ch >= 'A' && ch <= 'Z' = Just (fromIntegral (ord ch - ord 'A')) - | ch >= 'a' && ch <= 'z' = Just (26 + fromIntegral (ord ch - ord 'a')) - | ch >= '0' && ch <= '9' = Just (52 + fromIntegral (ord ch - ord '0')) - | ch == a = Just 62 - | ch == b = Just 63 - | otherwise = Nothing - -fromB64 :: Char -> Char -> Word8 -> Char -fromB64 ch62 ch63 x - | x < 26 = chr (ord 'A' + xi) - | x < 52 = chr (ord 'a' + (xi-26)) - | x < 62 = chr (ord '0' + (xi-52)) - | x == 62 = ch62 - | x == 63 = ch63 - | otherwise = error ("fromB64: index out of range " ++ show x) - where - xi :: Int - xi = fromIntegral x - -low6 :: Word32 -> Word8 -low6 x = fromIntegral (x .&. 0x3f) - -lowByte :: Word32 -> Word8 -lowByte x = (fromIntegral x) .&. 0xff - diff --git a/MIME/Decode.hs b/MIME/Decode.hs deleted file mode 100644 index f23454a..0000000 --- a/MIME/Decode.hs +++ /dev/null @@ -1,56 +0,0 @@ -module MIME.Decode where - -import Data.Char -import MIME.QuotedPrintable as QP -import MIME.Base64 as Base64 - -decodeBody :: String -> String -> String -decodeBody enc body = - case map toLower enc of - "base64" -> map (chr.fromIntegral) $ Base64.decode body - "quoted-printable" -> QP.decode body - _ -> body - --- Decoding of RFC 2047's "encoded-words' production --- (as used in email-headers and some HTTP header cases --- (AtomPub's Slug: header)) -decodeWord :: String -> Maybe (String, String) -decodeWord str = - case str of - '=':'?':xs -> - case dropLang $ break (\ch -> ch =='?' || ch == '*') xs of - (cs,_:x:'?':bs) - | isKnownCharset (map toLower cs) -> - case toLower x of - 'q' -> decodeQ cs (break (=='?') bs) - 'b' -> decodeB cs (break (=='?') bs) - _ -> Nothing - _ -> Nothing - _ -> Nothing - where - isKnownCharset cs = cs `elem` ["iso-8859-1", "us-ascii"] - - -- ignore RFC 2231 extension of permitting a language tag to be supplied - -- after the charset. - dropLang (as,'*':bs) = (as,dropWhile (/='?') bs) - dropLang (as,bs) = (as,bs) - - decodeQ cset (fs,'?':'=':rs) = Just (fromCharset cset (QP.decode fs),rs) - decodeQ _ _ = Nothing - - decodeB cset (fs,'?':'=':rs) = - Just (fromCharset cset (Base64.decodeToString fs),rs) - decodeB _ _ = Nothing - - fromCharset _cset cs = cs - -decodeWords :: String -> String -decodeWords "" = "" -decodeWords (x:xs) - | isSpace x = x : decodeWords xs - | otherwise = - case decodeWord (x:xs) of - Nothing -> x : decodeWords xs - Just (as,bs) -> as ++ decodeWords bs - - diff --git a/MIME/Parse.hs b/MIME/Parse.hs deleted file mode 100644 index 06fffc6..0000000 --- a/MIME/Parse.hs +++ /dev/null @@ -1,241 +0,0 @@ -{- | - Module : MIME.Parse - Copyright : (c) 2006 - - Maintainer : tse-dev-team@galois.com - Stability : unstable - Portability : GHC - - Parsing MIME content. --} -module MIME.Parse - ( parseMIMEBody - , parseMIMEType - ) where - -import MIME.Type -import MIME.Decode - -import Data.Char -import Data.Maybe -import Data.List -import Debug.Trace ( trace ) - -parseMIMEBody :: [(String,String)] -> String -> MIMEValue -parseMIMEBody headers_in body = - case mimeType mty of - Multipart{} -> fst (parseMultipart mty body) - Message{} -> fst (parseMultipart mty body) - _ -> MIMEValue mty (parseContentDisp headers) - (Single (processBody headers body)) - - where headers = [ (map toLower k,v) | (k,v) <- headers_in ] - mty = fromMaybe defaultType - (parseContentType =<< lookup "content-type" headers) -defaultType :: Type -defaultType = Type { mimeType = Text "plain" - , mimeParams = [("charset", "us-ascii")] - } - -parseContentDisp :: [(String,String)] -> Maybe Disposition -parseContentDisp headers = - (processDisp . dropFoldingWSP) =<< lookup "content-disposition" headers - where - processDisp "" = Nothing - processDisp xs = Just $ - case break (\ch -> isSpace ch || ch == ';') xs of - (as,"") -> Disposition { dispType = toDispType (map toLower as) - , dispParams = [] - } - (as,bs) -> Disposition { dispType = toDispType (map toLower as) - , dispParams = processParams (parseParams bs) - } - - processParams = map procP - where - procP (as,val) - | "name" == asl = Name val - | "filename" == asl = Filename val - | "creation-date" == asl = CreationDate val - | "modification-date" == asl = ModDate val - | "read-date" == asl = ReadDate val - | "size" == asl = Size val - | otherwise = OtherParam (map toLower as) val - where asl = map toLower as - - toDispType t = case t of - "inline" -> DispInline - "attachment" -> DispAttachment - "form-data" -> DispFormData - _ -> DispOther t - - -processBody :: [(String,String)] -> String -> String -processBody headers body = - case lookup "content-transfer-encoding" headers of - Nothing -> body - Just v -> decodeBody v body - -parseMIMEMessage :: String -> MIMEValue -parseMIMEMessage entity = - case parseHeaders entity of - (as,bs) -> parseMIMEBody as bs - -parseHeaders :: String -> ([(String,String)], String) -parseHeaders str = - case findFieldName "" str of - Left (nm, rs) -> parseFieldValue nm (dropFoldingWSP rs) - Right body -> ([],body) - where - findFieldName _acc "" = Right "" - findFieldName _acc ('\r':'\n':xs) = Right xs - findFieldName acc (':':xs) = Left (reverse (dropWhile isHSpace acc), xs) - findFieldName acc (x:xs) = findFieldName (x:acc) xs - - parseFieldValue nm xs = - case takeUntilCRLF xs of - (as,"") -> ([(nm,as)],"") - (as,bs) -> let (zs,ys) = parseHeaders bs in ((nm,as):zs,ys) - -parseMultipart :: Type -> String -> (MIMEValue, String) -parseMultipart mty body = - case lookup "boundary" (mimeParams mty) of - Nothing -> trace ("Multipart mime type, " ++ showType mty ++ - ", has no required boundary parameter. Defaulting to text/plain") $ - (MIMEValue defaultType Nothing (Single body), "") - Just bnd -> (MIMEValue mty Nothing (Multi vals), rs) - where (vals,rs) = splitMulti bnd body - -splitMulti :: String -> String -> ([MIMEValue], String) -splitMulti bnd body_in = - -- Note: we insert a CRLF if it looks as if the boundary string starts - -- right off the bat. No harm done if this turns out to be incorrect. - let body = case body_in of - '-':'-':_ -> ('\r':'\n':body_in) - _ -> body_in - in case untilMatch dashBoundary body of - Nothing -> ([],"") - Just ('-':'-':xs) -> ([],xs) - Just xs -> splitMulti1 (dropTrailer xs) - - where - dashBoundary = ("\r\n--" ++ bnd) - - splitMulti1 xs = - case matchUntil dashBoundary xs of - ("","") -> ([],"") - (as,"") -> ([parseMIMEMessage as],"") - (as,'-':'-':bs) -> ([parseMIMEMessage as], dropTrailer bs) - (as,bs) -> let (zs,ys) = splitMulti1 (dropTrailer bs) - in ((parseMIMEMessage as) : zs,ys) - - dropTrailer xs = - case dropWhile isHSpace xs of - '\r':'\n':xs1 -> xs1 - xs1 -> xs1 -- hmm, flag an error? - -parseMIMEType :: String -> Maybe Type -parseMIMEType = parseContentType - -parseContentType :: String -> Maybe Type -parseContentType str = - case break (=='/') (dropFoldingWSP str) of - (maj,_:minor) -> - case break (\ ch -> isHSpace ch || isTSpecial ch) minor of - (as,bs) -> - Just Type { mimeType = toType maj as - , mimeParams = parseParams (dropWhile isHSpace bs) - } - _ -> trace ("unable to parse content-type: " ++ show str) $ Nothing - where - toType a b = case lookup (map toLower a) mediaTypes of - Just ctor -> ctor b - _ -> Other a b - - -parseParams :: String -> [(String,String)] -parseParams "" = [] -parseParams (';':xs) = - case break (=='=') (dropFoldingWSP xs) of - (nm,_:vs) -> - case vs of - '"':vs1 -> - case break (=='"') vs1 of - (val,"") -> [(nm,val)] - (val,_:zs) -> (nm,val):parseParams (dropWhile isHSpace zs) - _ -> case break (\ ch -> isHSpace ch || isTSpecial ch) vs of - (val,zs) -> (nm,val):parseParams (dropWhile isHSpace zs) - _ -> [] - -parseParams cs = trace ("curious: " ++ show cs) [] - -mediaTypes :: [(String, String -> MIMEType)] -mediaTypes = - [ ("multipart", (Multipart . toMultipart)) - , ("application", Application) - , ("audio", Audio) - , ("image", Image) - , ("message", Message) - , ("model", Model) - , ("text", Text) - , ("video", Video) - ] - where toMultipart b = fromMaybe other (lookup (map toLower b) multipartTypes) - where other = case b of - 'x':'-':_ -> Extension b - _ -> OtherMulti b - - -multipartTypes :: [(String, Multipart)] -multipartTypes = - [ ("alternative", Alternative) - , ("byteranges", Byteranges) - , ("digest", Digest) - , ("encrypted", Encrypted) - , ("form-data", FormData) - , ("mixed", Mixed) - , ("parallel", Parallel) - , ("related", Related) - , ("signed", Signed) - ] - - -untilMatch :: String -> String -> Maybe String -untilMatch str xs = go str xs - where go "" rs = Just rs - go _ "" = Nothing - go (a:as) (b:bs) = if a == b then go as bs else go str bs - -matchUntil :: String -> String -> (String, String) -matchUntil _ "" = ("", "") -matchUntil str xs - -- slow, but it'll do for now. - | str `isPrefixOf` xs = ("", drop (length str) xs) -matchUntil str (x:xs) = let (as,bs) = matchUntil str xs in (x:as,bs) - - - -isHSpace :: Char -> Bool -isHSpace c = c == ' ' || c == '\t' - -isTSpecial :: Char -> Bool -isTSpecial x = x `elem` "()<>@,;:\\\"/[]?=" - - -dropFoldingWSP :: String -> String -dropFoldingWSP "" = "" -dropFoldingWSP (x:xs) - | isHSpace x = dropFoldingWSP xs -dropFoldingWSP ('\r':'\n':x:xs) - | isHSpace x = dropFoldingWSP xs -dropFoldingWSP (x:xs) = x:xs - -takeUntilCRLF :: String -> (String, String) -takeUntilCRLF str = go "" str - where - go acc "" = (reverse (dropWhile isHSpace acc), "") - go acc ('\r':'\n':x:xs) - | isHSpace x = go (' ':acc) xs - | otherwise = (reverse (dropWhile isHSpace acc), x:xs) - go acc (x:xs) = go (x:acc) xs - diff --git a/MIME/QuotedPrintable.hs b/MIME/QuotedPrintable.hs deleted file mode 100644 index 514ce4e..0000000 --- a/MIME/QuotedPrintable.hs +++ /dev/null @@ -1,12 +0,0 @@ -module MIME.QuotedPrintable where - -import Data.Char - -decode :: String -> String -decode "" = "" -decode ('=':x1:x2:xs) - | isHexDigit x1 && isHexDigit x2 = - chr (digitToInt x1 * 16 + digitToInt x2) : decode xs -decode ('=':xs) = '=':decode xs - -- make it explicit that we propagate other '=' occurrences. -decode (x1:xs) = x1:decode xs diff --git a/MIME/Type.hs b/MIME/Type.hs deleted file mode 100644 index e9266ec..0000000 --- a/MIME/Type.hs +++ /dev/null @@ -1,166 +0,0 @@ -{- | - - Module : MIME.Type - Copyright : (c) 2006 - - Maintainer : tse-dev-team@galois.com - Stability : unstable - Portability : GHC - - Representing MIME types and values. --} -module MIME.Type where - -import Data.List ( concatMap, isSuffixOf ) - -data Type - = Type - { mimeType :: MIMEType - , mimeParams :: [(String,String)] - } deriving ( Show, Ord, Eq ) - -showType :: Type -> String -showType t = showMIMEType (mimeType t) ++ showMIMEParams (mimeParams t) - -showMIMEParams :: [(String,String)] -> String -showMIMEParams ps = concatMap showP ps - where - showP (a,b) = ';':a ++ '=':'"':b ++ "\"" - - -data MIMEType - = Application SubType - | Audio SubType - | Image SubType - | Message SubType - | Model SubType - | Multipart Multipart - | Text TextType - | Video SubType - | Other String SubType - deriving ( Show, Ord, Eq ) - -showMIMEType :: MIMEType -> String -showMIMEType t = - case t of - Application s -> "application/"++s - Audio s -> "audio/"++s - Image s -> "image/"++s - Message s -> "message/"++s - Model s -> "model/"++s - Multipart s -> "multipart/"++showMultipart s - Text s -> "text/"++s - Video s -> "video/"++s - Other a b -> a ++ '/':b - --- | a (type, subtype) MIME pair. -data MIMEPair - = MIMEPair String SubType - deriving ( Eq ) - -showMIMEPair :: MIMEPair -> String -showMIMEPair (MIMEPair a b) = a ++ '/':b - --- | default subtype representation. -type SubType = String - --- | subtype for text content; currently just a string. -type TextType = SubType - -subTypeString :: Type -> String -subTypeString t = - case break (=='/') (showMIMEType (mimeType t)) of - (_,"") -> "" - (_,_:bs) -> bs - -majTypeString :: Type -> String -majTypeString t = - case break (=='/') (showMIMEType (mimeType t)) of - (as,_) -> as - -data Multipart - = Alternative - | Byteranges - | Digest - | Encrypted - | FormData - | Mixed - | Parallel - | Related - | Signed - | Extension String -- ^ e.g., 'x-foo' (i.e., includes the 'x-' bit) - | OtherMulti String -- unrecognized\/uninterpreted. - -- (e.g., appledouble, voice-message, etc.) - deriving ( Show, Ord, Eq ) - -isXmlBased :: Type -> Bool -isXmlBased t = - case mimeType t of - Multipart{} -> False - _ -> "+xml" `isSuffixOf` subTypeString t - -isXmlType :: Type -> Bool -isXmlType t = isXmlBased t || - case mimeType t of - Application s -> s `elem` xml_media_types - Text s -> s `elem` xml_media_types - _ -> False - where - -- Note: xml-dtd isn't considered an XML type here. - xml_media_types :: [String] - xml_media_types = - [ "xml" - , "xml-external-parsed-entity" - ] - - -showMultipart :: Multipart -> String -showMultipart m = - case m of - Alternative -> "alternative" - Byteranges -> "byteranges" - Digest -> "digest" - Encrypted -> "encrypted" - FormData -> "form-data" - Mixed -> "mixed" - Parallel -> "parallel" - Related -> "related" - Signed -> "signed" - Extension e -> e - OtherMulti e -> e - -type Content = String - -data MIMEValue = MIMEValue { - mime_val_type :: Type, - mime_val_disp :: Maybe Disposition, - mime_val_content :: MIMEContent } - deriving ( Show, Eq ) - -data MIMEContent - = Single Content - | Multi [MIMEValue] - deriving (Eq,Show) - -data Disposition - = Disposition - { dispType :: DispType - , dispParams :: [DispParam] - } deriving ( Show, Eq ) - -data DispType - = DispInline - | DispAttachment - | DispFormData - | DispOther String - deriving ( Show, Eq) - -data DispParam - = Name String - | Filename String - | CreationDate String - | ModDate String - | ReadDate String - | Size String - | OtherParam String String - deriving ( Show, Eq) diff --git a/MIME/Utils.hs b/MIME/Utils.hs deleted file mode 100644 index a5db2d9..0000000 --- a/MIME/Utils.hs +++ /dev/null @@ -1,30 +0,0 @@ -{- | - Module : MIME.Utils - Copyright : (c) 2007 - - Maintainer : tse-dev-team@galois.com - Stability : unstable - Portability : GHC - - Extracting content from MIME values and types. --} -module MIME.Utils - ( findMultipartNamed -- :: String -> MIMEValue -> Maybe MIMEValue - ) where - -import MIME.Type -import Data.List ( find ) -import Control.Monad ( msum ) - --- | Given a parameter name, locate it within a MIME value, --- returning the corresponding (sub) MIME value. -findMultipartNamed :: String -> MIMEValue -> Maybe MIMEValue -findMultipartNamed nm mv = - case mime_val_content mv of - Multi ms -> msum (map (findMultipartNamed nm) ms) - Single {} -> do cd <- mime_val_disp mv - find (withDispName nm) (dispParams cd) - return mv - where withDispName a (Name b) = a == b - withDispName _ _ = False - |