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author | sternenseemann <git@lukasepple.de> | 2016-12-27 18:42:30 +0100 |
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committer | sternenseemann <git@lukasepple.de> | 2016-12-27 18:42:30 +0100 |
commit | e1343459d7e22605950405e3b63390b3496f65ba (patch) | |
tree | bb7f9dffe750e37e3ea27630679f435fbdb82f81 |
init
-rw-r--r-- | ChangeLog.md | 5 | ||||
-rw-r--r-- | LICENSE | 674 | ||||
-rw-r--r-- | Setup.hs | 2 | ||||
-rw-r--r-- | default.nix | 2 | ||||
-rw-r--r-- | gopher-proxy.cabal | 35 | ||||
-rw-r--r-- | gopher-proxy.css | 20 | ||||
-rw-r--r-- | gopher-proxy.nix | 17 | ||||
-rw-r--r-- | src/GopherProxy/Config.hs | 37 | ||||
-rw-r--r-- | src/GopherProxy/Protocol.hs | 43 | ||||
-rw-r--r-- | src/GopherProxy/Types.hs | 18 | ||||
-rw-r--r-- | src/Main.hs | 133 |
11 files changed, 986 insertions, 0 deletions
diff --git a/ChangeLog.md b/ChangeLog.md new file mode 100644 index 0000000..a932005 --- /dev/null +++ b/ChangeLog.md @@ -0,0 +1,5 @@ +# Revision history for gopher-proxy + +## 0.1.0.0 -- YYYY-mm-dd + +* First version. Released on an unsuspecting world. diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..45644ff --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see <http://www.gnu.org/licenses/>. + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + <program> Copyright (C) <year> <name of author> + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +<http://www.gnu.org/licenses/>. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +<http://www.gnu.org/philosophy/why-not-lgpl.html>. diff --git a/Setup.hs b/Setup.hs new file mode 100644 index 0000000..9a994af --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/default.nix b/default.nix new file mode 100644 index 0000000..9d84eb9 --- /dev/null +++ b/default.nix @@ -0,0 +1,2 @@ +let pkgs = import <nixpkgs> {}; +in pkgs.haskellPackages.callPackage ./gopher-proxy.nix { } diff --git a/gopher-proxy.cabal b/gopher-proxy.cabal new file mode 100644 index 0000000..07d81f8 --- /dev/null +++ b/gopher-proxy.cabal @@ -0,0 +1,35 @@ +-- Initial gopher-proxy.cabal generated by cabal init. For further +-- documentation, see http://haskell.org/cabal/users-guide/ + +name: gopher-proxy +version: 0.1.0.0 +synopsis: proxy gopher over http +license: GPL-3 +license-file: LICENSE +author: sternenseemann +maintainer: git@lukasepple.de +-- copyright: +category: Network +build-type: Simple +extra-source-files: ChangeLog.md +cabal-version: >=1.10 + +executable gopher-proxy + main-is: Main.hs + -- other-modules: + -- other-extensions: + build-depends: base + , wai + , warp + , http-types + , lucid + , bytestring + , text + , network + , attoparsec + , errors + , mime-types + , optparse-generic + , optparse-applicative + hs-source-dirs: src + default-language: Haskell2010 diff --git a/gopher-proxy.css b/gopher-proxy.css new file mode 100644 index 0000000..9937994 --- /dev/null +++ b/gopher-proxy.css @@ -0,0 +1,20 @@ +body { + font-family: monospace; + font-size: 100%; + white-space: pre-wrap; +} + +a:link, a:visited { + color: blue; +} + +.error { + color: red; +} + +ul { + padding:0; + margin:0; + list-style:none; + line-height:2em; +} diff --git a/gopher-proxy.nix b/gopher-proxy.nix new file mode 100644 index 0000000..9d8e448 --- /dev/null +++ b/gopher-proxy.nix @@ -0,0 +1,17 @@ +{ mkDerivation, attoparsec, base, bytestring, errors, http-types +, lucid, mime-types, network, optparse-applicative +, optparse-generic, stdenv, text, wai, warp +}: +mkDerivation { + pname = "gopher-proxy"; + version = "0.1.0.0"; + src = ./.; + isLibrary = false; + isExecutable = true; + executableHaskellDepends = [ + attoparsec base bytestring errors http-types lucid mime-types + network optparse-applicative optparse-generic text wai warp + ]; + description = "proxy gopher over http"; + license = stdenv.lib.licenses.gpl3; +} diff --git a/src/GopherProxy/Config.hs b/src/GopherProxy/Config.hs new file mode 100644 index 0000000..ec0b44e --- /dev/null +++ b/src/GopherProxy/Config.hs @@ -0,0 +1,37 @@ +{-# LANGUAGE DeriveGeneric #-} +{-# LANGUAGE OverloadedStrings #-} +module GopherProxy.Config + ( Config (..) + , dCssUrl + , dBaseUrl + ) where + +import qualified Data.ByteString as BS +import Data.Maybe (fromMaybe) +import Network.Socket (HostName (), PortNumber ()) +import Options.Applicative.Types +import Options.Generic + +data Config + = Config + { hostname :: HostName + , port :: PortNumber + , httpPort :: Int + , cssPath :: FilePath + , cssUrl :: Maybe BS.ByteString + , baseUrl :: Maybe Text + } deriving (Generic, Show) + +instance ParseRecord PortNumber where + parseRecord = fmap getOnly parseRecord + +instance ParseFields PortNumber where + parseFields a b = fmap fromIntegral (parseFields a b :: Parser Integer) + +instance ParseRecord Config + +dCssUrl :: Config -> BS.ByteString +dCssUrl = fromMaybe "/gopher-proxy.css" . cssUrl + +dBaseUrl :: Config -> Text +dBaseUrl = fromMaybe "/" . baseUrl diff --git a/src/GopherProxy/Protocol.hs b/src/GopherProxy/Protocol.hs new file mode 100644 index 0000000..c6308aa --- /dev/null +++ b/src/GopherProxy/Protocol.hs @@ -0,0 +1,43 @@ +{-# LANGUAGE OverloadedStrings #-} +module GopherProxy.Protocol where + +import GopherProxy.Types +import Control.Applicative ((<|>), some) +import Control.Error.Safe (readErr) +import Data.Attoparsec.ByteString.Lazy +import qualified Data.ByteString.Lazy as B +import Data.Char (chr) +import Data.Text (Text ()) +import qualified Data.Text as T +import Data.Text.Encoding (decodeUtf8) + +itemValue = takeTill (inClass "\t\r\n") + +gopherMenuParser :: Parser GopherResponse +gopherMenuParser = MenuResponse <$> some gopherMenuLine + +gopherMenuLine :: Parser MenuItem +gopherMenuLine = do + char <- chr . fromIntegral <$> anyWord8 + title <- B.fromStrict <$> itemValue + string "\t" + filePath <- B.fromStrict <$> itemValue + string "\t" + hostName <- itemValue + string "\t" + port <- T.unpack . decodeUtf8 <$> itemValue + string "\n" <|> string "\r\n" + + case (readErr "port" port) of + Left e + -> fail e + Right p + -> pure $ MenuItem char title filePath (T.unpack (decodeUtf8 hostName)) p + +gopherFileParser :: Parser GopherResponse +gopherFileParser = FileResponse <$> takeLazyByteString + +gopherResponseParser :: Maybe GopherResponseType -> Parser GopherResponse +gopherResponseParser (Just Menu) = gopherMenuParser +gopherResponseParser (Just File) = gopherFileParser +gopherResponseParser Nothing = gopherMenuParser <|> gopherFileParser diff --git a/src/GopherProxy/Types.hs b/src/GopherProxy/Types.hs new file mode 100644 index 0000000..d4b4d06 --- /dev/null +++ b/src/GopherProxy/Types.hs @@ -0,0 +1,18 @@ +module GopherProxy.Types where + +import Data.ByteString.Lazy (ByteString ()) +import Network.Socket (HostName (), PortNumber ()) + +data GopherResponse + = MenuResponse [MenuItem] + | FileResponse ByteString + deriving Show + +data GopherResponseType + = Menu + | File + +data MenuItem + = MenuItem Char ByteString ByteString HostName PortNumber + deriving Show + diff --git a/src/Main.hs b/src/Main.hs new file mode 100644 index 0000000..6b0eef1 --- /dev/null +++ b/src/Main.hs @@ -0,0 +1,133 @@ +{-# LANGUAGE OverloadedStrings #-} +{-# LANGUAGE LambdaCase #-} +{-# LANGUAGE DataKinds #-} +{-# LANGUAGE OverloadedStrings #-} +{-# LANGUAGE TypeOperators #-} +{-# LANGUAGE ScopedTypeVariables #-} + +import GopherProxy.Types +import GopherProxy.Protocol +import GopherProxy.Config + +import Prelude hiding (takeWhile) +import Control.Exception +import Data.Attoparsec.ByteString.Lazy +import Data.ByteString.Lazy (ByteString ()) +import qualified Data.ByteString.Lazy as B +import qualified Data.ByteString as BS +import Data.Char (chr) +import Data.Monoid ((<>)) +import Data.Text (Text ()) +import qualified Data.Text as T +import Data.Text.Encoding (decodeUtf8, encodeUtf8) +import GHC.IO.Handle +import GHC.IO.IOMode +import Network.HTTP.Types +import Network.Mime +import Network.Socket hiding (send, sendTo, recv, recvFrom) +import Network.Socket.ByteString +import Network.Wai +import Network.Wai.Handler.Warp +import Lucid +import Options.Generic + +gopherProxy :: Config -> Application +gopherProxy cfg r resp + | requestMethod r == "GET" && + rawPathInfo r == dCssUrl cfg = cssResponse cfg r resp `catch` \(e::IOException) -> + internalErrorResponse "An IO error occured while retrieving the css." r resp + | requestMethod r == "GET" = gopherResponse cfg r resp `catch` \(e::IOException) -> + internalErrorResponse (T.pack "An IO error occured while contacting the gopher server.") r resp + | otherwise = badRequestResponse cfg r resp + +cssResponse :: Config -> Application +cssResponse cfg _ respond = do + css <- B.readFile . cssPath $ cfg + respond $ responseLBS status200 [("Content-type", "text/css")] css + +gopherResponse :: Config -> Application +gopherResponse cfg r respond = do + (resp, mime) <- (flip fmap) + (makeGopherRequest (hostname cfg) (port cfg) (B.fromStrict (rawPathInfo r))) $ + \case + Just r -> r + Nothing -> ( MenuResponse [ MenuItem '3' "An error occured while retrieving server's response." "" "" 0 ] + , "text/html") + respond $ uncurry (responseLBS status200) $ + case resp of + MenuResponse _ -> + ([("Content-type", "text/html")], renderBS (gResponseToHtml cfg resp)) + FileResponse b -> + case fmap BS.tail (BS.span (/= 47) mime) of + ("text", "html") -> ([("Content-type", mime)], b) + ("text", _) -> ([("Content-type", "text/html")], renderBS (gResponseToHtml cfg resp)) + _ -> ([("Content-type", mime)], b) + +badRequestResponse :: Config -> Application +badRequestResponse cfg _ respond = respond $ responseLBS badRequest400 + [("Content-type", "text/plain")] "gopher-proxy did not understand your request" + +internalErrorResponse :: Text -> Application +internalErrorResponse err _ resp = resp $ responseLBS internalServerError500 + [("Content-type", "text/plain")] (B.fromStrict (encodeUtf8 err)) + +makeGopherRequest :: HostName -> PortNumber -> ByteString -> IO (Maybe (GopherResponse, MimeType)) +makeGopherRequest host port req = do + addri:_ <- getAddrInfo Nothing (Just host) Nothing + let addr = + case (addrAddress addri) of + SockAddrInet _ h -> SockAddrInet port h + SockAddrInet6 _ f h s -> SockAddrInet6 port f h s + x -> x + + sock <- socket (addrFamily addri) Stream (addrProtocol addri) + connect sock addr + hdl <- socketToHandle sock ReadWriteMode + hSetBuffering hdl NoBuffering + B.hPutStr hdl (req <> "\r\n") + resp <- BS.hGetContents hdl + pure $ case parseOnly (gopherResponseParser Nothing) resp of + Left _ -> Nothing + Right r -> case r of + MenuResponse _ -> Just (r, "text/html") + FileResponse _ -> Just (r, mimeByExt defaultMimeMap defaultMimeType (decodeUtf8 (B.toStrict req))) + +prependBaseUrl :: Text -> Text -> Text +prependBaseUrl base path + | T.null base || T.null path = base <> path + | T.head path == '/' = if T.last base == '/' + then base <> T.tail path + else base <> path + | T.last base == '/' = base <> path + | otherwise = base <> "/" <> path + +-- we generally assume that everything is utf-8 encoded +gResponseToHtml :: Config -> GopherResponse -> Html () +gResponseToHtml cfg res + = doctype_ <> html_ + (head_ (meta_ [charset_ "utf-8"] + <> title_ "gopher-proxy" + <> link_ [rel_ "stylesheet", type_ "text/css", href_ . decodeUtf8 . dCssUrl $ cfg]) + <> body_ bodyContent) + where bodyContent = case res of + FileResponse bytes -> pre_ (toHtml bytes) + MenuResponse items -> ul_ $ foldl (itemChain cfg) mempty items + +itemChain :: Config -> Html () -> MenuItem -> Html () +itemChain cfg acc (MenuItem typec desc path' host' port') + = acc <> li_ itemHtml + where path = decodeUtf8 . B.toStrict $ path' + itemHtml = case typec of + 'i' -> toHtml desc + '3' -> span_ [class_ "error"] (toHtml desc) + _ -> a_ [href_ url] (toHtml desc) + url = if "URL:" `T.isPrefixOf` path + then T.drop 4 path + else if host' == hostname cfg && port' == port cfg + then prependBaseUrl (dBaseUrl cfg) path + else prependBaseUrl ("gopher://" <> (T.pack host') <> ":" <> (T.pack (show port'))) path + +main :: IO () +main = do + config <- getRecord "gopher-proxy" + run (httpPort config) (gopherProxy config) |