From 843d0dca7ed054c1c65661662044bf8bcd51528c Mon Sep 17 00:00:00 2001
From: Igor Pashev <pashev.igor@gmail.com>
Date: Sat, 11 Jun 2016 16:46:49 +0800
Subject: Log user ID

---
 juandelacosa.cabal |  2 ++
 src/Application.hs | 10 +++++++---
 src/LogFormat.hs   | 40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 49 insertions(+), 3 deletions(-)
 create mode 100644 src/LogFormat.hs

diff --git a/juandelacosa.cabal b/juandelacosa.cabal
index a228f61..ddac3a9 100644
--- a/juandelacosa.cabal
+++ b/juandelacosa.cabal
@@ -32,6 +32,7 @@ executable juandelacosa
     main-is: Main.hs
     other-modules:
       Application
+      LogFormat
       Server
     build-depends:
         base                     >= 4.8 && < 50
@@ -40,6 +41,7 @@ executable juandelacosa
       , data-default-class
       , docopt                   >= 0.7
       , entropy                  >= 0.3
+      , fast-logger
       , http-types               >= 0.9
       , interpolatedstring-perl6 >= 1.0
       , mtl                      >= 2.2
diff --git a/src/Application.hs b/src/Application.hs
index b3d7fb1..616532c 100644
--- a/src/Application.hs
+++ b/src/Application.hs
@@ -12,11 +12,11 @@ import Data.Default.Class (def)
 import Data.Pool (Pool, withResource)
 import Data.Text.Lazy.Encoding (encodeUtf8, decodeUtf8)
 import Database.MySQL.Simple (Connection, Only(..), query, execute)
-import Network.HTTP.Types (notFound404,  badRequest400)
+import Network.HTTP.Types (notFound404, badRequest400)
 import Network.Wai (Application, Middleware)
 import Network.Wai.Middleware.RequestLogger (Destination(Handle),
   mkRequestLogger, RequestLoggerSettings(destination, outputFormat),
-  OutputFormat(Apache), IPAddrSource(FromHeader))
+  OutputFormat(CustomOutputFormat))
 import Network.Wai.Middleware.Static (addBase, hasPrefix, staticPolicy, (>->))
 import System.Entropy (getEntropy)
 import System.IO (stderr)
@@ -25,9 +25,13 @@ import Web.Scotty (ScottyM, ActionM, header, middleware, file, get, post,
 import qualified Data.ByteString.Char8 as BS
 import qualified Data.ByteString.Lazy.Char8 as LBS
 
+import LogFormat (logFormat)
+
+
 app :: Pool Connection -> FilePath -> IO Application
 app p f = do
-  logger <- mkRequestLogger def{ destination = Handle stderr, outputFormat = Apache FromHeader }
+  logger <- mkRequestLogger def{ destination = Handle stderr
+                               , outputFormat = CustomOutputFormat logFormat }
   scottyApp (juanDeLaCosa p logger f)
 
 juanDeLaCosa :: Pool Connection -> Middleware -> FilePath -> ScottyM ()
diff --git a/src/LogFormat.hs b/src/LogFormat.hs
new file mode 100644
index 0000000..51c36c6
--- /dev/null
+++ b/src/LogFormat.hs
@@ -0,0 +1,40 @@
+{-# LANGUAGE OverloadedStrings #-}
+
+module LogFormat (
+  logFormat
+) where
+
+import Data.Maybe (fromMaybe)
+import Data.Monoid ((<>))
+import Network.HTTP.Types (Status(statusCode))
+import Network.Wai (Request, httpVersion, requestHeaders, requestMethod,
+  rawPathInfo, requestHeaderReferer, requestHeaderUserAgent)
+import System.Log.FastLogger (LogStr, toLogStr)
+import qualified Data.ByteString.Char8 as BS
+
+-- Sligthly modified Common Log Format.
+-- User ID extracted from the From header.
+logFormat :: BS.ByteString -> Request -> Status -> Maybe Integer -> LogStr
+logFormat t req st msize = ""
+  <> toLogStr (fromMaybe "-" $ lookup "X-Forwarded-For" headers)
+  <> " - "
+  <> toLogStr (fromMaybe "-" $ lookup "From" headers)
+  <> " ["
+  <> toLogStr t
+  <> "] \""
+  <> toLogStr (requestMethod req)
+  <> " "
+  <> toLogStr (rawPathInfo req)
+  <> " "
+  <> toLogStr (show $ httpVersion req)
+  <> "\" "
+  <> toLogStr (show $ statusCode st)
+  <> " "
+  <> toLogStr (maybe "-" show msize)
+  <> " \""
+  <> toLogStr (fromMaybe "" $ requestHeaderReferer req)
+  <> "\" \""
+  <> toLogStr (fromMaybe "" $ requestHeaderUserAgent req)
+  <> "\"\n"
+  where headers = requestHeaders req
+
-- 
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