qr-imager (empty) → 0.1.0.0

raw patch · 6 files changed

+195/−0 lines, 6 filesdep +JuicyPixelsdep +aesondep +basesetup-changed

Dependencies added: JuicyPixels, aeson, base, bytestring, cryptonite, directory, haskell-qrencode, jose-jwt, lens, qr-imager, vector

Files

LICENSE +30/−0
README.md +25/−0
Setup.hs +2/−0
app/Main.hs +11/−0
qr-imager.cabal +42/−0
src/Data/QRCodes.hs +85/−0

+ LICENSE view

@@ -0,0 +1,30 @@+Copyright Vanessa McHale (c) 2016++All rights reserved.++Redistribution and use in source and binary forms, with or without+modification, are permitted provided that the following conditions are met:++    * Redistributions of source code must retain the above copyright+      notice, this list of conditions and the following disclaimer.++    * Redistributions in binary form must reproduce the above+      copyright notice, this list of conditions and the following+      disclaimer in the documentation and/or other materials provided+      with the distribution.++    * Neither the name of Vanessa McHale nor the names of other+      contributors may be used to endorse or promote products derived+      from this software without specific prior written permission.++THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

+ README.md view

@@ -0,0 +1,25 @@+#QR Imager Library+This is a library to generate `.png` files from QR codes.++##Dependencies+The library depends on the C library [https://github.com/fukuchi/libqrencode](libqrencode) which you will need to install separately.++##Usage+The library exports main functions - `createQRCode` and `byteStringToQR` - and their secured/signed versions. The first takes any object that is an instance of `ToJSON` and writes an image to file, while the second takes a (strict) bytestring and writes it to file.++##Executable++###Installation+For building haskell, the best tool is currently [http://haskellstack.org](stack). Install it, and then type++```+stack install --install-ghc+```++in the appropriate directory, and it will be installed on your path. ++###Use++Compiling will generate an executable called `QRPipe` which reads from `stdin` and outputs a file as the second argument, e.g.++```echo 'My name is:" | QRPipe "nametag.png"```

+ Setup.hs view

@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

+ app/Main.hs view

@@ -0,0 +1,11 @@+{-#LANGUAGE OverloadedStrings #-}++import Data.QRCodes+import qualified Data.ByteString as B+import System.Environment (getArgs)++main :: IO ()+main = do+    pipeIn <- B.getContents+    filepath <- fmap (flip (!!) 0) getArgs+    byteStringToQRSec pipeIn filepath

+ qr-imager.cabal view

@@ -0,0 +1,42 @@+name:                qr-imager+version:             0.1.0.0+synopsis:            Library to generate QR codes from bytestrings and objects+description:         Please see README.md+homepage:            https://github.com/vmchale/QRImager#readme+license:             BSD3+license-file:        LICENSE+author:              Vanessa McHale+maintainer:          tmchale@wisc.edu+copyright:           Copyright: (c) 2016 Vanessa McHale+category:            Data+build-type:          Simple+extra-source-files:  README.md+cabal-version:       >=1.10++library+  hs-source-dirs:      src+  exposed-modules:     Data.QRCodes+  build-depends:       base >= 4.7 && < 5+                     , aeson+                     , JuicyPixels+                     , vector+                     , bytestring+                     , lens+                     , cryptonite+                     , jose-jwt+                     , directory+                     , haskell-qrencode+  default-language:    Haskell2010++executable QRPipe+  hs-source-dirs:      app+  main-is:             Main.hs+  ghc-options:         -threaded -rtsopts -with-rtsopts=-N+  build-depends:       base+                     , qr-imager+                     , bytestring+  default-language:    Haskell2010++source-repository head+  type:     git+  location: https://github.com/vmchale/QRImager

+ src/Data/QRCodes.hs view

@@ -0,0 +1,85 @@+{-# LANGUAGE GADTs            #-}+{-# LANGUAGE FlexibleContexts #-}++module Data.QRCodes (createSecureQRCode+              , createQRCode+              , byteStringToQR+              , byteStringToQRSec+              ) where++import Data.Aeson+import Data.QRCode+import Codec.Picture.Types as T+import Codec.Picture.Png (writePng)+import Data.Word (Word8)+import qualified Data.Vector.Storable as V+import Data.ByteString.Lazy (toStrict)+import qualified Data.ByteString as BS+import qualified Data.ByteString.Lazy as BSL+import Data.List (replicate)+import Data.Char (toLower)+import Prelude as P+import Crypto.PubKey.RSA as Cr+import Jose.Jws+import System.Directory (doesFileExist)+import Control.Lens.Tuple+import Control.Lens (view)+import Jose.Jwt (unJwt, JwtError)+import Jose.Jwa (JwsAlg (RS512))+import Data.Either (either)+import Data.Bits ((.&.))+import Control.Applicative ((<$>))++checkSig :: BS.ByteString -> IO (Either JwtError BS.ByteString)+checkSig tok = do+    key <- read <$> readFile "~/.key.hk" :: IO (Cr.PublicKey, Cr.PrivateKey)+    let jws = rsaDecode (view _1 key) tok+    return $ fmap (view _2) jws++mkSig :: BS.ByteString -> IO BS.ByteString+mkSig string = do+    switch <- doesFileExist "~/.key.hk"+    if not switch then do+        putStrLn "generating key..."+        key <- Cr.generate 512 0x10001+        writeFile "~/.key.hk" (show key)+    else+        return ()+    key' <- read <$> readFile "~/.key.hk" :: IO (Cr.PublicKey, Cr.PrivateKey)+    signedToken <- rsaEncode RS512 (view _2 key') string+    let signed = fmap unJwt signedToken+    liftEither id (return <$> signed)++-- | Creates a signed QR code from a strict bytestring+byteStringToQRSec :: BS.ByteString -> FilePath -> IO ()+byteStringToQRSec string filepath = (flip byteStringToQR filepath) =<< (mkSig string)++-- | Creates a signed QR code from an object that is part of the ToJSON class+createSecureQRCode :: (ToJSON a) => a -> FilePath -> IO ()+createSecureQRCode object = byteStringToQRSec (toStrict $ encode object)++liftEither :: (Show b, Monad m) => (t -> m a) -> Either b t -> m a+liftEither = either (error . show)++-- | Creates a QR code from an object that is part of the ToJSON class+createQRCode :: (ToJSON a) => a -> FilePath -> IO ()+createQRCode object filepath = let input = toStrict $ encode object in byteStringToQR input filepath++-- | Creates a QR code from a strict bytestring+byteStringToQR :: BS.ByteString -> FilePath -> IO ()+byteStringToQR input filepath = do+    smallMatrix <- toMatrix <$> encodeByteString input Nothing QR_ECLEVEL_H QR_MODE_EIGHT False+    let qrMatrix = fattenList 8 $ P.map (fattenList 8) smallMatrix+    writePng filepath (encodePng qrMatrix)++encodePng :: [[Word8]] -> T.Image Word8+encodePng matrix = Image dim dim vector+    where dim    = P.length matrix+          vector = V.map ((*255) . swapWord) $ V.fromList $ P.concat matrix++fattenList :: Int -> [a] -> [a]+fattenList i l = P.concat $ P.foldr ((:) . (P.replicate i)) [] l++swapWord :: Word8 -> Word8+swapWord 1 = 0+swapWord 0 = 1