Rpxnow module written.

.gitignore

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+*.swp
+dist

LICENSE

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+The following license covers this documentation, and the source code, except
+where otherwise indicated.
+
+Copyright 2008, Michael Snoyman. 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.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS "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 HOLDERS 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.

Setup.lhs

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+#!/usr/bin/env runhaskell
+
+> module Main where
+> import Distribution.Simple
+
+> main :: IO ()
+> main = defaultMain

Web/Authenticate/Rpxnow.hs

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+---------------------------------------------------------
+-- |
+-- Module        : Web.Authenticate.Rpxnow
+-- Copyright     : Michael Snoyman
+-- License       : BSD3
+--
+-- Maintainer    : Michael Snoyman <michael@snoyman.com>
+-- Stability     : Unstable
+-- Portability   : portable
+--
+-- Facilitates authentication with "http://rpxnow.com/".
+--
+---------------------------------------------------------
+module Web.Authenticate.Rpxnow
+    ( Identifier (..)
+    , authenticate
+    ) where
+
+import Text.JSON
+import Network.HTTP.Wget
+import Data.Maybe (isJust, fromJust)
+
+-- | Information received from Rpxnow after a valid login.
+data Identifier = Identifier
+    { identifier :: String
+    , extraData :: [(String, String)]
+    }
+
+-- | Attempt to log a user in.
+authenticate :: Monad m
+             => String -- ^ API key given by RPXNOW.
+             -> String -- ^ Token passed by client.
+             -> IO (m Identifier)
+authenticate apiKey token = do
+    body <- wget
+                "https://rpxnow.com/api/v2/auth_info"
+                []
+                [ ("apiKey", apiKey)
+                , ("token", token)
+                ]
+    case body of
+        Left s -> return $ fail $ "Unable to connect to rpxnow: " ++ s
+        Right b ->
+          case decode b >>= getObject of
+            Error s -> return $ fail $ "Not a valid JSON response: " ++ s
+            Ok o ->
+              case valFromObj "stat" o of
+                Error _ -> return $ fail "Missing 'stat' field"
+                Ok "ok" -> return $ parseProfile o
+                Ok stat -> return $ fail $ "Login not accepted: " ++ stat
+
+parseProfile :: Monad m => JSObject JSValue -> m Identifier
+parseProfile v = do
+    profile <- resultToMonad $ valFromObj "profile" v >>= getObject
+    ident <- resultToMonad $ valFromObj "identifier" profile
+    let pairs = fromJSObject profile
+        pairs' = filter (\(k, _) -> k /= "identifier") pairs
+        pairs'' = map fromJust . filter isJust . map takeString $ pairs'
+    return $ Identifier ident pairs''
+
+takeString :: (String, JSValue) -> Maybe (String, String)
+takeString (k, JSString v) = Just (k, fromJSString v)
+takeString _ = Nothing
+
+getObject :: Monad m => JSValue -> m (JSObject JSValue)
+getObject (JSObject o) = return o
+getObject _ = fail "Not an object"
+
+resultToMonad :: Monad m => Result a -> m a
+resultToMonad (Ok x) = return x
+resultToMonad (Error s) = fail s

authenticate.cabal

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+name:            authenticate
+version:         0.0.0
+license:         BSD3
+license-file:    LICENSE
+author:          Michael Snoyman <michael@snoyman.com>
+maintainer:      Michael Snoyman <michael@snoyman.com>
+synopsis:        Authentication methods for Haskell web applications.
+description:     Focus is on remote authentication methods, such as OpenID,
+                 rpxnow and Google.
+category:        Web
+stability:       unstable
+cabal-version:   >= 1.2
+build-type:      Simple
+
+library
+    build-depends:   base, json, http-wget
+    exposed-modules: Web.Authenticate.Rpxnow
+    ghc-options:     -Wall