module Network.Wai.Logger.IP (
    NumericAddress, showSockAddr
  ) where

import Data.Bits (shift, (.&.))
import Data.Word (Word32)
import Network.Socket (SockAddr(..))
import System.ByteOrder (ByteOrder(..), byteOrder)
import Text.Printf (printf)

-- |  A type for IP address in numeric string representation.
type NumericAddress = String

showIPv4 :: Word32 -> Bool -> NumericAddress
showIPv4 :: Word32 -> Bool -> NumericAddress
showIPv4 Word32
w32 Bool
little
    | Bool
little    = Word32 -> NumericAddress
forall a. Show a => a -> NumericAddress
show Word32
b1 NumericAddress -> NumericAddress -> NumericAddress
forall a. [a] -> [a] -> [a]
++ NumericAddress
"." NumericAddress -> NumericAddress -> NumericAddress
forall a. [a] -> [a] -> [a]
++ Word32 -> NumericAddress
forall a. Show a => a -> NumericAddress
show Word32
b2 NumericAddress -> NumericAddress -> NumericAddress
forall a. [a] -> [a] -> [a]
++ NumericAddress
"." NumericAddress -> NumericAddress -> NumericAddress
forall a. [a] -> [a] -> [a]
++ Word32 -> NumericAddress
forall a. Show a => a -> NumericAddress
show Word32
b3 NumericAddress -> NumericAddress -> NumericAddress
forall a. [a] -> [a] -> [a]
++ NumericAddress
"." NumericAddress -> NumericAddress -> NumericAddress
forall a. [a] -> [a] -> [a]
++ Word32 -> NumericAddress
forall a. Show a => a -> NumericAddress
show Word32
b4
    | Bool
otherwise = Word32 -> NumericAddress
forall a. Show a => a -> NumericAddress
show Word32
b4 NumericAddress -> NumericAddress -> NumericAddress
forall a. [a] -> [a] -> [a]
++ NumericAddress
"." NumericAddress -> NumericAddress -> NumericAddress
forall a. [a] -> [a] -> [a]
++ Word32 -> NumericAddress
forall a. Show a => a -> NumericAddress
show Word32
b3 NumericAddress -> NumericAddress -> NumericAddress
forall a. [a] -> [a] -> [a]
++ NumericAddress
"." NumericAddress -> NumericAddress -> NumericAddress
forall a. [a] -> [a] -> [a]
++ Word32 -> NumericAddress
forall a. Show a => a -> NumericAddress
show Word32
b2 NumericAddress -> NumericAddress -> NumericAddress
forall a. [a] -> [a] -> [a]
++ NumericAddress
"." NumericAddress -> NumericAddress -> NumericAddress
forall a. [a] -> [a] -> [a]
++ Word32 -> NumericAddress
forall a. Show a => a -> NumericAddress
show Word32
b1
  where
    t1 :: Word32
t1 = Word32
w32
    t2 :: Word32
t2 = Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shift Word32
t1 (-Int
8)
    t3 :: Word32
t3 = Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shift Word32
t2 (-Int
8)
    t4 :: Word32
t4 = Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shift Word32
t3 (-Int
8)
    b1 :: Word32
b1 = Word32
t1 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.&. Word32
0x000000ff
    b2 :: Word32
b2 = Word32
t2 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.&. Word32
0x000000ff
    b3 :: Word32
b3 = Word32
t3 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.&. Word32
0x000000ff
    b4 :: Word32
b4 = Word32
t4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.&. Word32
0x000000ff

showIPv6 :: (Word32,Word32,Word32,Word32) -> String
showIPv6 :: (Word32, Word32, Word32, Word32) -> NumericAddress
showIPv6 (Word32
w1,Word32
w2,Word32
w3,Word32
w4) =
    NumericAddress
-> Word32
-> Word32
-> Word32
-> Word32
-> Word32
-> Word32
-> Word32
-> Word32
-> NumericAddress
forall r. PrintfType r => NumericAddress -> r
printf NumericAddress
"%x:%x:%x:%x:%x:%x:%x:%x" Word32
s1 Word32
s2 Word32
s3 Word32
s4 Word32
s5 Word32
s6 Word32
s7 Word32
s8
  where
    (Word32
s1,Word32
s2) = Word32 -> (Word32, Word32)
forall a. (Bits a, Num a) => a -> (a, a)
split16 Word32
w1
    (Word32
s3,Word32
s4) = Word32 -> (Word32, Word32)
forall a. (Bits a, Num a) => a -> (a, a)
split16 Word32
w2
    (Word32
s5,Word32
s6) = Word32 -> (Word32, Word32)
forall a. (Bits a, Num a) => a -> (a, a)
split16 Word32
w3
    (Word32
s7,Word32
s8) = Word32 -> (Word32, Word32)
forall a. (Bits a, Num a) => a -> (a, a)
split16 Word32
w4
    split16 :: a -> (a, a)
split16 a
w = (a
h1,a
h2)
      where
        h1 :: a
h1 = a -> Int -> a
forall a. Bits a => a -> Int -> a
shift a
w (-Int
16) a -> a -> a
forall a. Bits a => a -> a -> a
.&. a
0x0000ffff
        h2 :: a
h2 = a
w a -> a -> a
forall a. Bits a => a -> a -> a
.&. a
0x0000ffff
-- | Convert 'SockAddr' to 'NumericAddress'. If the address is
--   IPv4-embedded IPv6 address, the IPv4 is extracted.
showSockAddr :: SockAddr -> NumericAddress
-- HostAddr is network byte order.
showSockAddr :: SockAddr -> NumericAddress
showSockAddr (SockAddrInet PortNumber
_ Word32
addr4)                       = Word32 -> Bool -> NumericAddress
showIPv4 Word32
addr4 (ByteOrder
byteOrder ByteOrder -> ByteOrder -> Bool
forall a. Eq a => a -> a -> Bool
== ByteOrder
LittleEndian)
-- HostAddr6 is host byte order.
showSockAddr (SockAddrInet6 PortNumber
_ Word32
_ (Word32
0,Word32
0,Word32
0x0000ffff,Word32
addr4) Word32
_) = Word32 -> Bool -> NumericAddress
showIPv4 Word32
addr4 Bool
False
showSockAddr (SockAddrInet6 PortNumber
_ Word32
_ (Word32
0,Word32
0,Word32
0,Word32
1) Word32
_)              = NumericAddress
"::1"
showSockAddr (SockAddrInet6 PortNumber
_ Word32
_ (Word32, Word32, Word32, Word32)
addr6 Word32
_)                  = (Word32, Word32, Word32, Word32) -> NumericAddress
showIPv6 (Word32, Word32, Word32, Word32)
addr6
showSockAddr (SockAddrUnix NumericAddress
_)                             = NumericAddress
"-"