module Network.Wai.Application.Classic.Field where
import Control.Arrow (first)
import Control.Monad (mplus)
import Data.ByteString (ByteString)
import qualified Data.ByteString as BS hiding (pack)
import Data.ByteString.Char8 as BS (pack)
import qualified Data.Map as Map (toList)
import Data.Maybe
import Data.StaticHash (StaticHash)
import qualified Data.StaticHash as SH
import Network.HTTP.Date
import Network.HTTP.Types
import Network.Wai
import Network.Wai.Application.Classic.Header
import Network.Wai.Application.Classic.Lang
import Network.Wai.Application.Classic.Types
import Network.Wai.Application.Static (defaultMimeTypes, defaultMimeType, MimeType, fromFilePath)
import Network.Wai.Logger.Utils
languages :: Request -> [Ascii]
languages req = maybe [] parseLang $ lookupRequestField fkAcceptLanguage req
ifModifiedSince :: Request -> Maybe HTTPDate
ifModifiedSince = lookupAndParseDate fkIfModifiedSince
ifUnmodifiedSince :: Request -> Maybe HTTPDate
ifUnmodifiedSince = lookupAndParseDate fkIfUnmodifiedSince
ifRange :: Request -> Maybe HTTPDate
ifRange = lookupAndParseDate fkIfRange
lookupAndParseDate :: FieldKey -> Request -> Maybe HTTPDate
lookupAndParseDate key req = lookupRequestField key req >>= parseHTTPDate
textPlainHeader :: ResponseHeaders
textPlainHeader = [("Content-Type", "text/plain")]
textHtmlHeader :: ResponseHeaders
textHtmlHeader = [("Content-Type", "text/html")]
locationHeader :: ByteString -> ResponseHeaders
locationHeader url = [("Location", url)]
addServer :: ClassicAppSpec -> ResponseHeaders -> ResponseHeaders
addServer cspec hdr = ("Server", softwareName cspec) : hdr
addVia :: ClassicAppSpec -> Request -> ResponseHeaders -> ResponseHeaders
addVia cspec req hdr = ("Via", val) : hdr
where
ver = httpVersion req
showBS = BS.pack . show
val = BS.concat [
showBS (httpMajor ver)
, "."
, showBS (httpMinor ver)
, " "
, serverName req
, " ("
, softwareName cspec
, ")"
]
addForwardedFor :: Request -> ResponseHeaders -> ResponseHeaders
addForwardedFor req hdr = ("X-Forwarded-For", addr) : hdr
where
addr = BS.pack . showSockAddr . remoteHost $ req
addLength :: Integer -> ResponseHeaders -> ResponseHeaders
addLength len hdr = ("Content-Length", BS.pack . show $ len) : hdr
newHeader :: Bool -> ByteString -> HTTPDate -> ResponseHeaders
newHeader ishtml file mtime
| ishtml = lastMod : textHtmlHeader
| otherwise = lastMod : [("Content-Type", mimeType file)]
where
lastMod = ("Last-Modified", formatHTTPDate mtime)
mimeType :: ByteString -> MimeType
mimeType file =fromMaybe defaultMimeType . foldr1 mplus . map lok $ targets
where
targets = extensions file
lok x = SH.lookup x defaultMimeTypes'
extensions :: ByteString -> [ByteString]
extensions file = exts
where
entire = case BS.breakByte 46 file of
(_,"") -> ""
(_,x) -> BS.tail x
exts = if entire == "" then [] else entire : BS.split 46 file
defaultMimeTypes' :: StaticHash ByteString MimeType
defaultMimeTypes' = SH.fromList $ map (first (BS.pack.fromFilePath)) $ Map.toList defaultMimeTypes