-- DAV.hs: WebDAV client library
-- Copyright © 2012-2014 Clint Adams
--
-- vim: softtabstop=4:shiftwidth=4:expandtab
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see .
{-# LANGUAGE OverloadedStrings, ConstraintKinds, FlexibleContexts,
QuasiQuotes, RankNTypes, GeneralizedNewtypeDeriving,
FlexibleInstances, MultiParamTypeClasses, UndecidableInstances,
TypeFamilies #-}
module Network.Protocol.HTTP.DAV (
DAVT(..)
, evalDAVT
, withDAVContext
, runDAVContext
, setCreds
, setDepth
, setResponseTimeout
, setUserAgent
, DAVContext(..)
, getProps
, getPropsAndContent
, putContentAndProps
, putContent
, deleteContent
, moveContent
, makeCollection
, caldavReport
, caldavReportM
, delContentM
, getPropsM
, getContentM
, withContentM
, mkCol
, moveContentM
, putPropsM
, putContentM
, putContentM'
, withLockIfPossible
, withLockIfPossibleForDelete
, module Network.Protocol.HTTP.DAV.TH
) where
import Network.Protocol.HTTP.DAV.TH
import Control.Applicative (liftA2, Applicative)
import Control.Error (EitherT(..))
import Control.Exception.Lifted (catchJust, finally, bracket, bracketOnError)
import Control.Lens ((^.), (.=), (%=))
import Control.Monad (liftM, liftM2, when, MonadPlus)
import Control.Monad.Base (MonadBase(..))
import Control.Monad.Error (MonadError)
import Control.Monad.Fix (MonadFix)
import Control.Monad.Trans (lift, MonadTrans)
import Control.Monad.IO.Class (liftIO, MonadIO)
import Control.Monad.State (evalStateT, runStateT, get, MonadState, StateT)
import Control.Monad.Trans.Control (MonadBaseControl(..))
import qualified Data.ByteString as B
import qualified Data.ByteString.Char8 as BC8
import qualified Data.ByteString.Lazy as BL
import qualified Data.Map as Map
import Data.Maybe (catMaybes, fromMaybe)
import Network.HTTP.Client (RequestBody(..), httpLbs, parseUrl, applyBasicAuth, Request(..), Response(..), newManager, closeManager, HttpException(..), BodyReader, withResponse)
import Network.HTTP.Client.TLS (tlsManagerSettings)
import Network.HTTP.Types (hContentType, Method, Status, RequestHeaders, unauthorized401, conflict409)
import qualified Text.XML as XML
import Text.XML.Cursor (($/), (&/), element, node, fromDocument, checkName)
import Text.Hamlet.XML (xml)
import Data.CaseInsensitive (mk)
newtype DAVT m a = DAVT { runDAVT :: EitherT String (StateT DAVContext m) a }
deriving (Applicative, Functor, Monad, MonadBase b, MonadError String, MonadFix, MonadIO, MonadPlus, MonadState DAVContext)
instance MonadBaseControl b m => MonadBaseControl b (DAVT m) where
newtype StM (DAVT m) a = StDAVT { unStDAVT :: StM (EitherT String (StateT DAVContext m)) a }
liftBaseWith f = DAVT . liftBaseWith $ \r -> f $ liftM StDAVT . r . runDAVT
restoreM = DAVT . restoreM . unStDAVT
instance MonadTrans DAVT where
lift = DAVT . lift . lift
type DAVURL = String
evalDAVT :: MonadIO m => DAVURL -> DAVT m a -> m (Either String a)
evalDAVT u f = do
ctx <- mkDAVContext u
r <- (evalStateT . runEitherT . runDAVT) f ctx
closeDAVContext ctx
return r
mkDAVContext :: MonadIO m => DAVURL -> m DAVContext
mkDAVContext u = liftIO $ do
mgr <- liftIO $ newManager tlsManagerSettings
req <- liftIO $ parseUrl u
return $ DAVContext [] req B.empty B.empty [] Nothing mgr Nothing "hDav-using application"
closeDAVContext :: MonadIO m => DAVContext -> m ()
closeDAVContext ctx = liftIO $ closeManager (ctx ^. httpManager)
withDAVContext :: (MonadIO m, MonadBaseControl IO m) => DAVURL -> (DAVContext -> m a) -> m a
withDAVContext u = bracket (mkDAVContext u) closeDAVContext
runDAVContext :: MonadIO m => DAVContext -> DAVT m a -> m (Either String a, DAVContext)
runDAVContext ctx f = (runStateT . runEitherT . runDAVT) f ctx
choke :: IO (Either String a) -> IO a
choke f = do
x <- f
case x of
Left e -> error e
Right r -> return r
setCreds :: MonadIO m => B.ByteString -> B.ByteString -> DAVT m ()
setCreds u p = basicusername .= u >> basicpassword .= p
setDepth :: MonadIO m => Maybe Depth -> DAVT m ()
setDepth d = depth .= d
setUserAgent :: MonadIO m => B.ByteString -> DAVT m ()
setUserAgent ua = userAgent .= ua
setResponseTimeout :: MonadIO m => Maybe Int -> DAVT m ()
setResponseTimeout rt = baseRequest %= \x -> x { responseTimeout = rt }
mkDavRequest :: MonadIO m => Method -> RequestHeaders -> RequestBody -> DAVT m Request
mkDavRequest meth addlhdrs rbody = do
ctx <- get
let hdrs = catMaybes
[ Just (mk "User-Agent", ctx ^. userAgent)
, fmap ((,) (mk "Depth") . BC8.pack . show) (ctx ^. depth)
] ++ addlhdrs
req = (ctx ^. baseRequest) { method = meth, requestHeaders = hdrs, requestBody = rbody }
authreq = if B.null (ctx ^. basicusername) && B.null (ctx ^. basicpassword)
then req
else applyBasicAuth (ctx ^. basicusername) (ctx ^. basicpassword) req
return authreq
davRequest :: MonadIO m => Method -> RequestHeaders -> RequestBody -> DAVT m (Response BL.ByteString)
davRequest meth addlhdrs rbody = go =<< mkDavRequest meth addlhdrs rbody
where
go req = do
ctx <- get
liftIO (httpLbs req (ctx ^. httpManager))
matchStatusCodeException :: Status -> HttpException -> Maybe ()
matchStatusCodeException want (StatusCodeException s _ _)
| s == want = Just ()
| otherwise = Nothing
matchStatusCodeException _ _ = Nothing
emptyBody :: RequestBody
emptyBody = RequestBodyLBS BL.empty
xmlBody :: XML.Document -> RequestBody
xmlBody = RequestBodyLBS . XML.renderLBS XML.def
getOptions :: MonadIO m => DAVT m ()
getOptions = do
optresp <- davRequest "OPTIONS" [] emptyBody
let meths = (B.splitWith (==(fromIntegral . fromEnum) ',') . fromMaybe B.empty . lookup "Allow" . responseHeaders) optresp
let cclass = (B.splitWith (==(fromIntegral . fromEnum) ',') . fromMaybe B.empty . lookup "DAV" . responseHeaders) optresp
complianceClasses .= cclass
allowedMethods .= meths
lockResource :: MonadIO m => Bool -> DAVT m ()
lockResource nocreate = do
let ahs' = [(hContentType, "application/xml; charset=\"utf-8\""), (mk "Depth", "0"), (mk "Timeout", "Second-300")]
let ahs = if nocreate then (mk "If-Match", "*"):ahs' else ahs'
lockresp <- davRequest "LOCK" ahs (xmlBody locky)
let hdrtoken = (lookup "Lock-Token" . responseHeaders) lockresp
lockToken .= hdrtoken
unlockResource :: MonadIO m => DAVT m ()
unlockResource = do
d <- get
case _lockToken d of
Nothing -> return ()
Just tok -> do let ahs = [(mk "Lock-Token", tok)]
_ <- davRequest "UNLOCK" ahs emptyBody
lockToken .= Nothing
supportsLocking :: DAVContext -> Bool
supportsLocking = liftA2 (&&) ("LOCK" `elem`) ("UNLOCK" `elem`) . _allowedMethods
supportsCalDAV :: DAVContext -> Bool
supportsCalDAV = ("calendar-access" `elem`) . _complianceClasses
getPropsM :: MonadIO m => DAVT m XML.Document
getPropsM = do
let ahs = [(hContentType, "application/xml; charset=\"utf-8\"")]
propresp <- davRequest "PROPFIND" ahs (xmlBody propname)
return $ (XML.parseLBS_ XML.def . responseBody) propresp
-- | Note that the entire request body is buffered in memory.
-- To stream large files use withContentM instead.
getContentM :: MonadIO m => DAVT m (Maybe B.ByteString, BL.ByteString)
getContentM = do
resp <- davRequest "GET" [] emptyBody
let ct = lookup hContentType (responseHeaders resp)
return (ct, responseBody resp)
withContentM :: MonadIO m => (Response BodyReader -> IO a) -> DAVT m a
withContentM handleresponse = do
req <- mkDavRequest "GET" [] emptyBody
ctx <- get
liftIO $ withResponse req (ctx ^. httpManager) handleresponse
-- | Note that the entire request body is buffered in memory; not suitable
-- for large files.
putContentM :: MonadIO m => (Maybe B.ByteString, BL.ByteString) -> DAVT m ()
putContentM (ct, body) = putContentM' (ct, RequestBodyLBS body)
-- | To send a large file, pass eg a RequestBodyStream containing the
-- file's content.
putContentM' :: MonadIO m => (Maybe B.ByteString, RequestBody) -> DAVT m ()
putContentM' (ct, requestbody) = do
d <- get
let ahs' = maybe [] (return . (,) (mk "If") . parenthesize) (d ^. lockToken)
let ahs = ahs' ++ maybe [] (return . (,) hContentType) ct
_ <- davRequest "PUT" ahs requestbody
return ()
delContentM :: MonadIO m => DAVT m ()
delContentM = do
_ <- davRequest "DELETE" [] emptyBody
return ()
moveContentM :: MonadIO m => B.ByteString -> DAVT m ()
moveContentM newurl = do
let ahs = [ (mk "Destination", newurl) ]
_ <- davRequest "MOVE" ahs emptyBody
return ()
mkCol' :: MonadIO m => DAVT m ()
mkCol' = do
_ <- davRequest "MKCOL" [] emptyBody
return ()
mkCol :: (MonadIO m, MonadBase IO m, MonadBaseControl IO m) => DAVT m Bool
mkCol = catchJust
(matchStatusCodeException conflict409)
(mkCol' >> return True)
(\_ -> return False)
parenthesize :: B.ByteString -> B.ByteString
parenthesize x = B.concat ["(", x, ")"]
putPropsM :: MonadIO m => XML.Document -> DAVT m ()
putPropsM props = do
d <- get
let ah' = (hContentType, "application/xml; charset=\"utf-8\"")
let ahs = ah':maybe [] (return . (,) (mk "If") . parenthesize) (_lockToken d)
_ <- davRequest "PROPPATCH" ahs ((RequestBodyLBS . props2patch) props) -- FIXME: should diff and remove props from target
return ()
props2patch :: XML.Document -> BL.ByteString
props2patch = XML.renderLBS XML.def . patch . props . fromDocument
where
props cursor = map node (cursor $/ element "{DAV:}response" &/ element "{DAV:}propstat" &/ element "{DAV:}prop" &/ checkName (not . flip elem blacklist))
patch prop = XML.Document (XML.Prologue [] Nothing []) (root prop) []
root [] = propertyupdate []
root prop = propertyupdate
[ XML.NodeElement $ XML.Element "D:set" Map.empty
[ XML.NodeElement $ XML.Element "D:prop" Map.empty prop ]
]
propertyupdate = XML.Element "D:propertyupdate" (Map.fromList [("xmlns:D", "DAV:")])
blacklist = [ "{DAV:}creationdate"
, "{DAV:}displayname"
, "{DAV:}getcontentlength"
, "{DAV:}getcontenttype"
, "{DAV:}getetag"
, "{DAV:}getlastmodified"
, "{DAV:}lockdiscovery"
, "{DAV:}resourcetype"
, "{DAV:}supportedlock"
]
caldavReportM :: MonadIO m => DAVT m XML.Document
caldavReportM = do
let ahs = [(hContentType, "application/xml; charset=\"utf-8\"")]
calrresp <- davRequest "REPORT" ahs (xmlBody calendarquery)
return $ (XML.parseLBS_ XML.def . responseBody) calrresp
getOptionsOnce :: MonadIO m => DAVT m ()
getOptionsOnce = getOptions -- this should only happen once
withLockIfPossible :: (MonadIO m, MonadBase IO m, MonadBaseControl IO m) => Bool -> DAVT m a -> DAVT m a
withLockIfPossible nocreate f = do
getOptionsOnce
o <- get
when (supportsLocking o) (lockResource nocreate)
f `finally` when (supportsLocking o) unlockResource
withLockIfPossibleForDelete :: (MonadIO m, MonadBase IO m, MonadBaseControl IO m) => Bool -> DAVT m a -> DAVT m a
withLockIfPossibleForDelete nocreate f = do
getOptionsOnce
o <- get
let lock = when (supportsLocking o) (lockResource nocreate)
-- a successful delete destroys locks, so only unlock on error
let unlock = when (supportsLocking o) unlockResource
bracketOnError lock (const unlock) (const f)
{-# DEPRECATED getProps "This function will be removed in favor of getPropsM" #-}
getProps :: String -> B.ByteString -> B.ByteString -> Maybe Depth -> IO XML.Document
getProps url username password md = choke $ evalDAVT url $ do
setCreds username password
setDepth md
getPropsM
{-# DEPRECATED getPropsAndContent "This function will be removed in favor of getPropsM and getContentM" #-}
getPropsAndContent :: String -> B.ByteString -> B.ByteString -> IO (XML.Document, (Maybe B.ByteString, BL.ByteString))
getPropsAndContent url username password = choke $ evalDAVT url $ do
setCreds username password
setDepth (Just Depth0)
withLockIfPossible True $ liftM2 (,) getPropsM getContentM
{-# DEPRECATED putContent "This function will be removed in favor of putContentM" #-}
putContent :: String -> B.ByteString -> B.ByteString -> (Maybe B.ByteString, BL.ByteString) -> IO ()
putContent url username password b = choke $ evalDAVT url $ do
setCreds username password
withLockIfPossible False $ putContentM b
{-# DEPRECATED putContentAndProps "This function will be removed in favor of putContentM and putPropsM" #-}
putContentAndProps :: String -> B.ByteString -> B.ByteString -> (XML.Document, (Maybe B.ByteString, BL.ByteString)) -> IO ()
putContentAndProps url username password (p, b) = choke $ evalDAVT url $ do
setCreds username password
withLockIfPossible False $ do putContentM b
putPropsM p
{-# DEPRECATED deleteContent "This function will be removed in favor of delContentM" #-}
deleteContent :: String -> B.ByteString -> B.ByteString -> IO ()
deleteContent url username password = choke $ evalDAVT url $ do
setCreds username password
withLockIfPossibleForDelete False delContentM
{-# DEPRECATED moveContent "This function will be removed in favor of moveContentM" #-}
moveContent :: String -> B.ByteString -> B.ByteString -> B.ByteString -> IO ()
moveContent url newurl username password = choke $ evalDAVT url $ do
setCreds username password
moveContentM newurl
{-# DEPRECATED caldavReport "This function will be removed in favor of caldavReportM" #-}
caldavReport :: String -> B.ByteString -> B.ByteString -> IO XML.Document
caldavReport url username password = choke $ evalDAVT url $ do
setCreds username password
setDepth (Just Depth1)
caldavReportM
-- | Creates a WebDAV collection, which is similar to a directory.
--
-- Returns False if the collection could not be made due to an intermediate
-- collection not existing. (Ie, collection /a/b/c/d cannot be made until
-- collection /a/b/c exists.)
{-# DEPRECATED makeCollection "This function will be removed in favor of mkCol" #-}
makeCollection :: String -> B.ByteString -> B.ByteString -> IO Bool
makeCollection url username password = choke $ evalDAVT url $ do
setCreds username password
mkCol
propname :: XML.Document
propname = XML.Document (XML.Prologue [] Nothing []) root []
where
root = XML.Element "D:propfind" (Map.fromList [("xmlns:D", "DAV:")]) [xml|
|]
locky :: XML.Document
locky = XML.Document (XML.Prologue [] Nothing []) root []
where
root = XML.Element "D:lockinfo" (Map.fromList [("xmlns:D", "DAV:")]) [xml|
Haskell DAV user
|]
calendarquery :: XML.Document
calendarquery = XML.Document (XML.Prologue [] Nothing []) root []
where
root = XML.Element "C:calendar-query" (Map.fromList [("xmlns:D", "DAV:"),("xmlns:C", "urn:ietf:params:xml:ns:caldav")]) [xml|
|]