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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/examples/Main.hs b/examples/Main.hs new file mode 100644 --- /dev/null +++ b/examples/Main.hs @@ -0,0 +1,26 @@ +{-# LANGUAGE OverloadedStrings #-} + +module Main (main) where + +import Data.Aeson (object, (.=)) +import Data.Text.Lazy.Encoding (encodeUtf8) +import Web.Scotty (scotty, get, json, text, setHeader, raw) + +import Web.Scotty.Format.Trans (respondTo, formatJson, formatText, format) + + +main :: IO () +main = scotty 8080 $ do + get "/hello" $ do + let content = "Hello world!" + respondTo $ do + formatJson $ + json $ object ["content" .= content] + formatText $ + text content + format "application/vnd.chess-pgn" $ do + setHeader "Content-Type" "application/vnd.chess-pgn; charset=utf-8" + raw $ encodeUtf8 "1. e4" + + get "/error" $ + respondTo $ return () diff --git a/scotty-format.cabal b/scotty-format.cabal new file mode 100644 --- /dev/null +++ b/scotty-format.cabal @@ -0,0 +1,53 @@ +name: scotty-format +version: 0.1.0.0 +synopsis: Response format helper for the Scotty web framework. +description: Please see README.md +homepage: https://github.com/potomak/scotty-format#readme +license: Apache-2.0 +license-file: LICENSE +author: Giovanni Cappellotto +maintainer: potomak84@gmail.com +copyright: 2016 Giovanni Cappellotto +category: Web +build-type: Simple +-- extra-source-files: +cabal-version: >=1.10 + +library + hs-source-dirs: src + exposed-modules: Web.Scotty.Format.Trans + ghc-options: -Wall + build-depends: + aeson, + base >= 4.7 && < 5, + http-media, + http-types, + scotty >= 0.10 && < 0.12, + text + default-language: Haskell2010 + +executable scotty-format-example + hs-source-dirs: examples + main-is: Main.hs + ghc-options: -threaded -rtsopts -with-rtsopts=-N -Wall + build-depends: + aeson, + base, + scotty, + scotty-format, + text + default-language: Haskell2010 + +test-suite scotty-format-test + type: exitcode-stdio-1.0 + hs-source-dirs: test + main-is: Spec.hs + build-depends: + base, + scotty-format + ghc-options: -threaded -rtsopts -with-rtsopts=-N -Wall + default-language: Haskell2010 + +source-repository head + type: git + location: https://github.com/potomak/scotty-format diff --git a/src/Web/Scotty/Format/Trans.hs b/src/Web/Scotty/Format/Trans.hs new file mode 100644 --- /dev/null +++ b/src/Web/Scotty/Format/Trans.hs @@ -0,0 +1,73 @@ +{-# LANGUAGE OverloadedStrings #-} + +module Web.Scotty.Format.Trans ( + respondTo, + formatHtml, + formatText, + formatJson, + format +) where + +import Control.Monad (liftM, ap) +import Data.Maybe (fromMaybe) +import Data.Monoid ((<>)) +import Data.Text.Lazy (toStrict) +import Data.Text.Encoding (encodeUtf8) +import Network.HTTP.Media (MediaType, mapAcceptMedia) +import Network.HTTP.Types (notAcceptable406) +import Web.Scotty.Trans (ActionT, ScottyError, status, header) + + +respondTo :: (ScottyError e, Monad m) + => ResponseFormat e m () + -> ActionT e m () +respondTo (RF preferences ()) = do + accept <- maybe "*/*" (encodeUtf8 . toStrict) <$> header "Accept" + fromMaybe (status notAcceptable406) (mapAcceptMedia preferences accept) + + +formatHtml :: (ScottyError e, Monad m) + => ActionT e m () + -> ResponseFormat e m () +formatHtml = format "text/html" + + +formatText :: (ScottyError e, Monad m) + => ActionT e m () + -> ResponseFormat e m () +formatText = format "text/plain" + + +formatJson :: (ScottyError e, Monad m) + => ActionT e m () + -> ResponseFormat e m () +formatJson = format "application/json" + + +format :: (ScottyError e, Monad m) + => MediaType + -> ActionT e m () + -> ResponseFormat e m () +format mediaType action = RF [(mediaType, action)] () + + +-- Private + +data ResponseFormat e m a = RF [(MediaType, ActionT e m ())] a + +instance Monad (ResponseFormat e m) where + return = RF [] + RF formats a >>= f = + let RF newFormats b = f a + in RF (formats <> newFormats) b + +instance Functor (ResponseFormat e m) where + fmap = liftM + +instance Applicative (ResponseFormat e m) where + pure = return + (<*>) = ap + +instance Monoid (ResponseFormat e m a) where + mempty = RF mempty undefined + mappend (RF a _) (RF b _) = RF (a <> b) undefined diff --git a/test/Spec.hs b/test/Spec.hs new file mode 100644 --- /dev/null +++ b/test/Spec.hs @@ -0,0 +1,2 @@ +main :: IO () +main = putStrLn "Test suite not yet implemented"