33 lines
764 B
Haskell
33 lines
764 B
Haskell
module Web.Authenticate.Internal
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( qsEncode
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, qsUrl
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) where
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import Codec.Binary.UTF8.String (encode)
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import Numeric (showHex)
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import Data.List (intercalate)
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qsUrl :: String -> [(String, String)] -> String
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qsUrl s [] = s
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qsUrl url pairs =
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url ++ delim : intercalate "&" (map qsPair pairs)
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where
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qsPair (x, y) = qsEncode x ++ '=' : qsEncode y
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delim = if '?' `elem` url then '&' else '?'
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qsEncode :: String -> String
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qsEncode =
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concatMap go . encode
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where
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go 32 = "+" -- space
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go 46 = "."
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go 45 = "-"
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go 126 = "~"
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go 95 = "_"
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go c
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| 48 <= c && c <= 57 = [w2c c]
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| 65 <= c && c <= 90 = [w2c c]
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| 97 <= c && c <= 122 = [w2c c]
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go c = '%' : showHex c ""
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w2c = toEnum . fromEnum
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