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|
{-# LANGUAGE OverloadedStrings #-}
--------------------------------------------------------------------
-- |
-- Module : Codec.MIME.Type
-- Copyright : (c) 2006-2009, Galois, Inc.
-- License : BSD3
--
-- Maintainer: Sigbjorn Finne <sigbjorn.finne@gmail.com>
-- Stability : provisional
-- Portability: portable
--
--
-- Representing MIME types and values.
--
--------------------------------------------------------------------
module Codec.MIME.Type where
import qualified Data.Text as T
import Data.Monoid ((<>))
data MIMEParam = MIMEParam { paramName :: T.Text
, paramValue :: T.Text }
deriving (Show, Ord, Eq)
data Type = Type
{ mimeType :: MIMEType
, mimeParams :: [MIMEParam]
} deriving ( Show, Ord, Eq )
-- | The @null@ MIME record type value; currently a @text/plain@.
nullType :: Type
nullType = Type
{ mimeType = Text "plain"
, mimeParams = []
}
showType :: Type -> T.Text
showType t = showMIMEType (mimeType t) <> showMIMEParams (mimeParams t)
showMIMEParams :: [MIMEParam] -> T.Text
showMIMEParams ps = T.concat $ map showP ps
where
showP (MIMEParam a b) = "; " <> a <> "=\"" <> b <> "\""
data MIMEType
= Application SubType
| Audio SubType
| Image SubType
| Message SubType
| Model SubType
| Multipart Multipart
| Text TextType
| Video SubType
| Other {otherType :: T.Text, otherSubType :: SubType}
deriving ( Show, Ord, Eq )
showMIMEType :: MIMEType -> T.Text
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 T.Text SubType
deriving ( Eq )
showMIMEPair :: MIMEPair -> T.Text
showMIMEPair (MIMEPair a b) = a <> "/" <> b
-- | default subtype representation.
type SubType = T.Text
-- | subtype for text content; currently just a string.
type TextType = SubType
subTypeString :: Type -> T.Text
subTypeString t = T.drop 1 $ snd $ T.break (=='/') (showMIMEType (mimeType t))
majTypeString :: Type -> T.Text
majTypeString t = fst $ T.break (=='/') (showMIMEType (mimeType t))
data Multipart
= Alternative
| Byteranges
| Digest
| Encrypted
| FormData
| Mixed
| Parallel
| Related
| Signed
| Extension T.Text -- ^ e.g., 'x-foo' (i.e., includes the 'x-' bit)
| OtherMulti T.Text -- unrecognized\/uninterpreted.
-- (e.g., appledouble, voice-message, etc.)
deriving ( Show, Ord, Eq )
isXmlBased :: Type -> Bool
isXmlBased t =
case mimeType t of
Multipart{} -> False
_ -> "+xml" `T.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 :: [T.Text]
xml_media_types =
[ "xml"
, "xml-external-parsed-entity"
]
showMultipart :: Multipart -> T.Text
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 = T.Text
data MIMEValue = MIMEValue
{ mime_val_type :: Type
, mime_val_disp :: Maybe Disposition
, mime_val_content :: MIMEContent
, mime_val_headers :: [MIMEParam]
, mime_val_inc_type :: Bool
} deriving ( Show, Eq )
nullMIMEValue :: MIMEValue
nullMIMEValue = MIMEValue
{ mime_val_type = nullType
, mime_val_disp = Nothing
, mime_val_content = Multi []
, mime_val_headers = []
, mime_val_inc_type = True
}
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 T.Text
deriving ( Show, Eq)
data DispParam
= Name T.Text
| Filename T.Text
| CreationDate T.Text
| ModDate T.Text
| ReadDate T.Text
| Size T.Text
| OtherParam T.Text T.Text
deriving ( Show, Eq)
|
