haskell/xss-sanitize
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Use custom safe tags also for continuation.

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This commit is contained in:
Yitzchak Gale 2018-06-26 21:59:25 +03:00
parent cb252f660f
commit b1c8a1ceeb
1 changed files with 8 additions and 8 deletions
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16
Text/HTML/SanitizeXSS.hs
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@ -34,7 +34,7 @@ import Network.URI ( parseURIReference, URI (..),
isAllowedInURI, escapeURIString, uriScheme )
import Codec.Binary.UTF8.String ( encodeString )
import Data.Maybe (catMaybes)
import Data.Maybe (mapMaybe)
-- | Sanitize HTML to prevent XSS attacks. This is equivalent to @filterTags safeTags@.
@ -88,14 +88,14 @@ safeTags = mySafeTags safeTagName sanitizeAttribute
mySafeTags :: (Text -> Bool) -> ((Text, Text) -> Maybe (Text, Text)) ->
[Tag Text] -> [Tag Text]
mySafeTags _ _ [] = []
mySafeTags safeName _ (t@(TagClose name):tags)
| safeName name = t : safeTags tags
| otherwise = safeTags tags
mySafeTags safeName sanitizeAttr (t@(TagClose name):tags)
| safeName name = t : mySafeTags safeName sanitizeAttr tags
| otherwise = mySafeTags safeName sanitizeAttr tags
mySafeTags safeName sanitizeAttr (TagOpen name attributes:tags)
| safeName name = TagOpen name
(catMaybes $ map sanitizeAttr attributes) : safeTags tags
| otherwise = safeTags tags
mySafeTags _ _ (t:tags) = t:safeTags tags
| safeName name = TagOpen name (mapMaybe sanitizeAttr attributes) :
mySafeTags safeName sanitizeAttr tags
| otherwise = mySafeTags safeName sanitizeAttr tags
mySafeTags n a (t:tags) = t : mySafeTags n a tags
safeTagName :: Text -> Bool
safeTagName tagname = tagname `member` sanitaryTags