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-rw-r--r--lib/Uris.hs6
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/Uris.hs b/lib/Uris.hs
index 5ad9180..e2d9a5f 100644
--- a/lib/Uris.hs
+++ b/lib/Uris.hs
@@ -9,7 +9,7 @@ module Uris where
-import Control.Monad (unless)
+import Control.Monad (unless, when)
import Data.Aeson (FromJSON (..), Options (..),
SumEncoding (UntaggedValue),
defaultOptions, genericParseJSON)
@@ -58,6 +58,7 @@ data SubstError =
| IsBlocked
| DomainDoesNotExist Text
| WrongScope Text [Text]
+ | VarsDisallowed
-- ^ This link's schema exists, but cannot be used in this scope.
-- The second field contains a list of schemas that may be used instead.
@@ -65,7 +66,10 @@ data SubstError =
applySubst :: KnownSymbol s
=> Proxy s -> SchemaSet -> Text -> Either SubstError Text
applySubst s substs uri = do
+ when (uri =~ "{{{.*}}}")
+ $ Left VarsDisallowed
(schema, domain, rest) <- note NotALink $ parseUri uri
+
rules <- note (SchemaDoesNotExist schema) ( M.lookup schema substs)
unless (symbolVal s `elem` scope rules)
$ Left (WrongScope schema