module Codec.Binary.Base64Url
( EncIncData(..)
, EncIncRes(..)
, encodeInc
, encode
, DecIncData(..)
, DecIncRes(..)
, decodeInc
, decode
, chop
, unchop
) where
import Codec.Binary.Util
import Data.Maybe
import Data.Word
import Data.Bits
import Data.Array
import qualified Data.Map as M
import qualified Codec.Binary.Base64 as Base64
_encMap :: [(Word8, Char)]
_encMap =
[ (0, 'A'), (1, 'B'), (2, 'C'), (3, 'D'), (4, 'E')
, (5, 'F') , (6, 'G'), (7, 'H'), (8, 'I'), (9, 'J')
, (10, 'K'), (11, 'L'), (12, 'M'), (13, 'N'), (14, 'O')
, (15, 'P'), (16, 'Q'), (17, 'R'), (18, 'S'), (19, 'T')
, (20, 'U'), (21, 'V'), (22, 'W'), (23, 'X'), (24, 'Y')
, (25, 'Z'), (26, 'a'), (27, 'b'), (28, 'c'), (29, 'd')
, (30, 'e'), (31, 'f'), (32, 'g'), (33, 'h'), (34, 'i')
, (35, 'j'), (36, 'k'), (37, 'l'), (38, 'm'), (39, 'n')
, (40, 'o'), (41, 'p'), (42, 'q'), (43, 'r'), (44, 's')
, (45, 't'), (46, 'u'), (47, 'v'), (48, 'w'), (49, 'x')
, (50, 'y'), (51, 'z'), (52, '0'), (53, '1'), (54, '2')
, (55, '3'), (56, '4'), (57, '5'), (58, '6'), (59, '7')
, (60, '8'), (61, '9'), (62, '-'), (63, '_') ]
encodeArray :: Array Word8 Char
encodeArray :: Array Word8 Char
encodeArray = (Word8, Word8) -> [(Word8, Char)] -> Array Word8 Char
forall i e. Ix i => (i, i) -> [(i, e)] -> Array i e
array (0, 64) [(Word8, Char)]
_encMap
decodeMap :: M.Map Char Word8
decodeMap :: Map Char Word8
decodeMap = [(Char, Word8)] -> Map Char Word8
forall k a. Ord k => [(k, a)] -> Map k a
M.fromList [((Word8, Char) -> Char
forall a b. (a, b) -> b
snd (Word8, Char)
i, (Word8, Char) -> Word8
forall a b. (a, b) -> a
fst (Word8, Char)
i) | (Word8, Char)
i <- [(Word8, Char)]
_encMap]
encodeInc :: EncIncData -> EncIncRes String
encodeInc :: EncIncData -> EncIncRes String
encodeInc e :: EncIncData
e = [Word8] -> EncIncData -> EncIncRes String
eI [] EncIncData
e
where
enc3 :: [Word8] -> String
enc3 [o1 :: Word8
o1, o2 :: Word8
o2, o3 :: Word8
o3] = String
cs
where
i1 :: Word8
i1 = Word8
o1 Word8 -> Int -> Word8
forall a. Bits a => a -> Int -> a
`shiftR` 2
i2 :: Word8
i2 = (Word8
o1 Word8 -> Int -> Word8
forall a. Bits a => a -> Int -> a
`shiftL` 4 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.|. Word8
o2 Word8 -> Int -> Word8
forall a. Bits a => a -> Int -> a
`shiftR` 4) Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. 0x3f
i3 :: Word8
i3 = (Word8
o2 Word8 -> Int -> Word8
forall a. Bits a => a -> Int -> a
`shiftL` 2 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.|. Word8
o3 Word8 -> Int -> Word8
forall a. Bits a => a -> Int -> a
`shiftR` 6) Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. 0x3f
i4 :: Word8
i4 = Word8
o3 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. 0x3f
cs :: String
cs = (Word8 -> Char) -> [Word8] -> String
forall a b. (a -> b) -> [a] -> [b]
map (Array Word8 Char
encodeArray Array Word8 Char -> Word8 -> Char
forall i e. Ix i => Array i e -> i -> e
!) [Word8
i1, Word8
i2, Word8
i3, Word8
i4]
eI :: [Word8] -> EncIncData -> EncIncRes String
eI [] EDone = String -> EncIncRes String
forall i. i -> EncIncRes i
EFinal []
eI [o1 :: Word8
o1] EDone = String -> EncIncRes String
forall i. i -> EncIncRes i
EFinal (Int -> String -> String
forall a. Int -> [a] -> [a]
take 2 String
cs String -> String -> String
forall a. [a] -> [a] -> [a]
++ "==")
where cs :: String
cs = [Word8] -> String
enc3 [Word8
o1, 0, 0]
eI [o1 :: Word8
o1, o2 :: Word8
o2] EDone = String -> EncIncRes String
forall i. i -> EncIncRes i
EFinal (Int -> String -> String
forall a. Int -> [a] -> [a]
take 3 String
cs String -> String -> String
forall a. [a] -> [a] -> [a]
++ "=")
where cs :: String
cs = [Word8] -> String
enc3 [Word8
o1, Word8
o2, 0]
eI lo :: [Word8]
lo (EChunk bs :: [Word8]
bs) = String -> [Word8] -> EncIncRes String
doEnc [] ([Word8]
lo [Word8] -> [Word8] -> [Word8]
forall a. [a] -> [a] -> [a]
++ [Word8]
bs)
where
doEnc :: String -> [Word8] -> EncIncRes String
doEnc acc :: String
acc (o1 :: Word8
o1:o2 :: Word8
o2:o3 :: Word8
o3:os :: [Word8]
os) = String -> [Word8] -> EncIncRes String
doEnc (String
acc String -> String -> String
forall a. [a] -> [a] -> [a]
++ [Word8] -> String
enc3 [Word8
o1, Word8
o2, Word8
o3]) [Word8]
os
doEnc acc :: String
acc os :: [Word8]
os = String -> (EncIncData -> EncIncRes String) -> EncIncRes String
forall i. i -> (EncIncData -> EncIncRes i) -> EncIncRes i
EPart String
acc ([Word8] -> EncIncData -> EncIncRes String
eI [Word8]
os)
encode :: [Word8] -> String
encode :: [Word8] -> String
encode = (EncIncData -> EncIncRes String) -> [Word8] -> String
forall a. (EncIncData -> EncIncRes [a]) -> [Word8] -> [a]
encoder EncIncData -> EncIncRes String
encodeInc
decodeInc :: DecIncData String -> DecIncRes String
decodeInc :: DecIncData String -> DecIncRes String
decodeInc d :: DecIncData String
d = String -> DecIncData String -> DecIncRes String
dI [] DecIncData String
d
where
dec4 :: String -> Maybe [Word8]
dec4 cs :: String
cs = let
ds :: [Maybe Word8]
ds = (Char -> Maybe Word8) -> String -> [Maybe Word8]
forall a b. (a -> b) -> [a] -> [b]
map ((Char -> Map Char Word8 -> Maybe Word8)
-> Map Char Word8 -> Char -> Maybe Word8
forall a b c. (a -> b -> c) -> b -> a -> c
flip Char -> Map Char Word8 -> Maybe Word8
forall k a. Ord k => k -> Map k a -> Maybe a
M.lookup Map Char Word8
decodeMap) String
cs
es :: [Word8]
es@[e1 :: Word8
e1, e2 :: Word8
e2, e3 :: Word8
e3, e4 :: Word8
e4] = (Maybe Word8 -> Word8) -> [Maybe Word8] -> [Word8]
forall a b. (a -> b) -> [a] -> [b]
map Maybe Word8 -> Word8
forall a. HasCallStack => Maybe a -> a
fromJust [Maybe Word8]
ds
o1 :: Word8
o1 = Word8
e1 Word8 -> Int -> Word8
forall a. Bits a => a -> Int -> a
`shiftL` 2 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.|. Word8
e2 Word8 -> Int -> Word8
forall a. Bits a => a -> Int -> a
`shiftR` 4
o2 :: Word8
o2 = Word8
e2 Word8 -> Int -> Word8
forall a. Bits a => a -> Int -> a
`shiftL` 4 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.|. Word8
e3 Word8 -> Int -> Word8
forall a. Bits a => a -> Int -> a
`shiftR` 2
o3 :: Word8
o3 = Word8
e3 Word8 -> Int -> Word8
forall a. Bits a => a -> Int -> a
`shiftL` 6 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.|. Word8
e4
allJust :: [Maybe a] -> Bool
allJust = [Bool] -> Bool
forall (t :: * -> *). Foldable t => t Bool -> Bool
and ([Bool] -> Bool) -> ([Maybe a] -> [Bool]) -> [Maybe a] -> Bool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (Maybe a -> Bool) -> [Maybe a] -> [Bool]
forall a b. (a -> b) -> [a] -> [b]
map Maybe a -> Bool
forall a. Maybe a -> Bool
isJust
in if [Maybe Word8] -> Bool
forall a. [Maybe a] -> Bool
allJust [Maybe Word8]
ds
then [Word8] -> Maybe [Word8]
forall a. a -> Maybe a
Just [Word8
o1, Word8
o2, Word8
o3]
else Maybe [Word8]
forall a. Maybe a
Nothing
dI :: String -> DecIncData String -> DecIncRes String
dI [] (DecIncData String
DDone) = [Word8] -> String -> DecIncRes String
forall i. [Word8] -> i -> DecIncRes i
DFinal [] []
dI lo :: String
lo (DecIncData String
DDone) = [Word8] -> String -> DecIncRes String
forall i. [Word8] -> i -> DecIncRes i
DFail [] String
lo
dI lo :: String
lo (DChunk s :: String
s) = [Word8] -> String -> DecIncRes String
doDec [] (String
lo String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
s)
where
doDec :: [Word8] -> String -> DecIncRes String
doDec acc :: [Word8]
acc s :: String
s@(c1 :: Char
c1:c2 :: Char
c2:'=':'=':cs :: String
cs) = DecIncRes String
-> ([Word8] -> DecIncRes String)
-> Maybe [Word8]
-> DecIncRes String
forall b a. b -> (a -> b) -> Maybe a -> b
maybe
([Word8] -> String -> DecIncRes String
forall i. [Word8] -> i -> DecIncRes i
DFail [Word8]
acc String
s)
(\ bs :: [Word8]
bs -> [Word8] -> String -> DecIncRes String
forall i. [Word8] -> i -> DecIncRes i
DFinal ([Word8]
acc [Word8] -> [Word8] -> [Word8]
forall a. [a] -> [a] -> [a]
++ Int -> [Word8] -> [Word8]
forall a. Int -> [a] -> [a]
take 1 [Word8]
bs) String
cs)
(String -> Maybe [Word8]
dec4 [Char
c1, Char
c2, 'A', 'A'])
doDec acc :: [Word8]
acc s :: String
s@(c1 :: Char
c1:c2 :: Char
c2:c3 :: Char
c3:'=':cs :: String
cs) = DecIncRes String
-> ([Word8] -> DecIncRes String)
-> Maybe [Word8]
-> DecIncRes String
forall b a. b -> (a -> b) -> Maybe a -> b
maybe
([Word8] -> String -> DecIncRes String
forall i. [Word8] -> i -> DecIncRes i
DFail [Word8]
acc String
s)
(\ bs :: [Word8]
bs -> [Word8] -> String -> DecIncRes String
forall i. [Word8] -> i -> DecIncRes i
DFinal ([Word8]
acc [Word8] -> [Word8] -> [Word8]
forall a. [a] -> [a] -> [a]
++ Int -> [Word8] -> [Word8]
forall a. Int -> [a] -> [a]
take 2 [Word8]
bs) String
cs)
(String -> Maybe [Word8]
dec4 [Char
c1, Char
c2, Char
c3, 'A'])
doDec acc :: [Word8]
acc s :: String
s@(c1 :: Char
c1:c2 :: Char
c2:c3 :: Char
c3:c4 :: Char
c4:cs :: String
cs) = DecIncRes String
-> ([Word8] -> DecIncRes String)
-> Maybe [Word8]
-> DecIncRes String
forall b a. b -> (a -> b) -> Maybe a -> b
maybe
([Word8] -> String -> DecIncRes String
forall i. [Word8] -> i -> DecIncRes i
DFail [Word8]
acc String
s)
(\ bs :: [Word8]
bs -> [Word8] -> String -> DecIncRes String
doDec ([Word8]
acc [Word8] -> [Word8] -> [Word8]
forall a. [a] -> [a] -> [a]
++ [Word8]
bs) String
cs)
(String -> Maybe [Word8]
dec4 [Char
c1, Char
c2, Char
c3, Char
c4])
doDec acc :: [Word8]
acc s :: String
s = [Word8]
-> (DecIncData String -> DecIncRes String) -> DecIncRes String
forall i. [Word8] -> (DecIncData i -> DecIncRes i) -> DecIncRes i
DPart [Word8]
acc (String -> DecIncData String -> DecIncRes String
dI String
s)
decode :: String -> Maybe [Word8]
decode :: String -> Maybe [Word8]
decode = (DecIncData String -> DecIncRes String) -> String -> Maybe [Word8]
forall i. (DecIncData i -> DecIncRes i) -> i -> Maybe [Word8]
decoder DecIncData String -> DecIncRes String
decodeInc
chop :: Int
-> String
-> [String]
chop :: Int -> String -> [String]
chop = Int -> String -> [String]
Base64.chop
unchop :: [String]
-> String
unchop :: [String] -> String
unchop = [String] -> String
Base64.unchop