ref/haskell: refactor error handling for bech32Decode #41
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| maybeToRight :: l -> Maybe r -> Either l r | ||
| maybeToRight l = maybe (Left l) Right | ||
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| verify :: Bool -> a -> Either a () |
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I feel that this would work better with the argument order reversed. Then it would be similar to maybeToRight.
| case bech32Decode checksum of | ||
| Nothing -> assertFailure (show checksum) | ||
| Just (resultHRP, resultData) -> do | ||
| Left err -> assertFailure (show checksum ++ show err) |
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something like intercalate ", " [show checksum, show err] would stop the assert failure message from being smooshed together.
| segwitEncode hrp witver witprog = do | ||
| guard $ segwitCheck witver witprog | ||
| bech32Encode hrp $ UnsafeWord5 witver : toBase32 witprog | ||
| rightToMaybe $ bech32Encode hrp $ UnsafeWord5 witver : toBase32 witprog |
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I think foo . bar $ x is preferred to foo $ bar $ x generally speaking. But this isn't show-stopping.
| Just (first, rest') = BS.uncons rest | ||
| checksumCorrupted = (hrp `BS.snoc` (first `xor` 1)) `BS.append` rest' | ||
| assertBool (show checksum ++ " corrupted") $ isNothing (bech32Decode checksumCorrupted) | ||
| assertBool (show checksum ++ " corrupted") $ isLeft (bech32Decode checksumCorrupted) |
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Shouldn't this be isError ChecksumVerificationFail instead of isLeft?
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Okay, the choice of corruption sometimes produces invalid characters.
| assertEqual (show checksum ++ " re-encode") expectedChecksum checksumEncoded | ||
| , testCase "Invalid checksums" $ forM_ invalidChecksums $ | ||
| \checksum -> assertBool (show checksum) (isNothing $ bech32Decode checksum) | ||
| \checksum -> assertBool (show checksum) (isLeft $ bech32Decode checksum) |
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Same here: Shouldn't this be isError ChecksumVerificationFail instead of isLeft?
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Okay I see these fail for various different reasons.
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The main reason to refactor was the
Maybein a signature. It is not clear why the given bech32 string is invalid.