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{- Url parsing.
-
- Copyright 2011-2023 Joey Hess <id@joeyh.name>
-
- License: BSD-2-clause
-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE CPP #-}
module Utility.Url.Parse (
parseURIPortable,
parseURIRelaxed,
) where
import Network.URI
#ifdef mingw32_HOST_OS
import qualified System.FilePath.Windows as PW
#endif
{- On unix this is the same as parseURI. But on Windows,
- it can parse urls such as file:///C:/path/to/file
- parseURI normally parses that as a path /C:/path/to/file
- and this simply removes the excess leading slash when there is a
- drive letter after it. -}
parseURIPortable :: String -> Maybe URI
#ifndef mingw32_HOST_OS
parseURIPortable = parseURI
#else
parseURIPortable s
| "file:" `isPrefixOf` s = do
u <- parseURI s
return $ case PW.splitDirectories (uriPath u) of
(p:d:_) | all PW.isPathSeparator p && PW.isDrive d ->
u { uriPath = dropWhile PW.isPathSeparator (uriPath u) }
_ -> u
| otherwise = parseURI s
#endif
{- Allows for spaces and other stuff in urls, properly escaping them. -}
parseURIRelaxed :: String -> Maybe URI
parseURIRelaxed s = maybe (parseURIRelaxed' s) Just $
parseURIPortable $ escapeURIString isAllowedInURI s
{- Some characters like '[' are allowed in eg, the address of
- an uri, but cannot appear unescaped further along in the uri.
- This handles that, expensively, by successively escaping each character
- from the back of the url until the url parses.
-}
parseURIRelaxed' :: String -> Maybe URI
parseURIRelaxed' s = go [] (reverse s)
where
go back [] = parseURI back
go back (c:cs) = case parseURI (escapeURIString isAllowedInURI (reverse (c:cs)) ++ back) of
Just u -> Just u
Nothing -> go (escapeURIChar escapemore c ++ back) cs
escapemore '[' = False
escapemore ']' = False
escapemore c = isAllowedInURI c
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