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{-# LANGUAGE OverloadedStrings, ScopedTypeVariables, GeneralizedNewtypeDeriving,
DeriveDataTypeable, FlexibleContexts, MultiParamTypeClasses, TemplateHaskell,
TypeFamilies, RecordWildCards, BangPatterns #-}
module Main where
import Control.Applicative ((<$>), (<*>), optional, pure)
import Control.Exception (bracket)
import Control.Monad (msum, mzero, when, unless)
import Control.Monad.IO.Class (liftIO)
import Control.Monad.State (get, put)
import Control.Monad.Reader (ask)
import qualified Crypto.Hash.SHA512 as SHA
import Data.Acid
import Data.Acid.Advanced
import Data.Acid.Local
import qualified Data.ByteString.Base64 as B64 (encode)
import Data.ByteString.Char8 (ByteString, pack, unpack)
import Data.Data (Data, Typeable)
import Data.Monoid (mempty)
import Data.Text (Text)
import qualified Data.Text as T
import Data.Time
import Data.SafeCopy (base, deriveSafeCopy)
import Happstack.Server hiding (Session)
import System.Environment(getEnv)
import System.Locale (defaultTimeLocale)
import Blog
import BlogDB hiding (addComment, updateEntry)
import Locales
{- Server -}
tmpPolicy :: BodyPolicy
tmpPolicy = (defaultBodyPolicy "./tmp/" 0 200000 1000)
main :: IO()
main = do
putStrLn ("TazBlog " ++ version ++ " in Haskell starting")
tbDir <- getEnv "TAZBLOG"
bracket (openLocalStateFrom (tbDir ++ "/BlogState") initialBlogState)
(createCheckpointAndClose)
(\acid -> simpleHTTP nullConf {port = 80} $ tazBlog acid)
tazBlog :: AcidState Blog -> ServerPart Response
tazBlog acid =
msum [ dir (show DE) $ blogHandler acid DE
, dir (show EN) $ blogHandler acid EN
, do nullDir
showIndex acid DE
, do dir " " $ nullDir
seeOther ("https://plus.google.com/115916629925754851590" :: Text) (toResponse ())
, path $ \(year :: Int) -> path $ \(month :: Int) -> path $ \(id_ :: String) -> formatOldLink year month id_
, dir "res" $ serveDirectory DisableBrowsing [] "../res"
, dir "notice" $ ok $ toResponse showSiteNotice
{- :Admin handlers -}
, do dirs "admin/postentry" $ nullDir
guardSession acid
postEntry acid
, do dirs "admin/entrylist" $ dir (show DE) $ nullDir
guardSession acid
entryList acid DE
, do dirs "admin/entrylist" $ dir (show EN) $ nullDir
guardSession acid
entryList acid EN
, do guardSession acid
dirs "admin/edit" $ path $ \(eId :: Integer) -> editEntry acid eId
, do dirs "admin/updateentry" $ nullDir
updateEntry acid
, do dir "admin" $ nullDir
guardSession acid
ok $ toResponse $ adminIndex ("tazjin" :: Text)
, dir "admin" $ ok $ toResponse $ adminLogin
, dir "dologin" $ processLogin acid
, serveDirectory DisableBrowsing [] "../res"
, notFound $ toResponse $ showError NotFound DE
]
blogHandler :: AcidState Blog -> BlogLang -> ServerPart Response
blogHandler acid lang =
msum [ path $ \(eId :: Integer) -> showEntry acid lang $ EntryId eId
, do decodeBody tmpPolicy
dir "postcomment" $ path $
\(eId :: Integer) -> addComment acid lang $ EntryId eId
, do nullDir
showIndex acid lang
, notFound $ toResponse $ showError NotFound lang
]
formatOldLink :: Int -> Int -> String -> ServerPart Response
formatOldLink y m id_ =
flip seeOther (toResponse ()) $
concat $ intersperse' "/" ["de", show y, show m, replace '.' '/' id_]
showEntry :: AcidState Blog -> BlogLang -> EntryId -> ServerPart Response
showEntry acid lang eId = do
entry <- query' acid (GetEntry eId)
tryEntry entry lang
tryEntry :: Maybe Entry -> BlogLang -> ServerPart Response
tryEntry Nothing lang = notFound $ toResponse $ showError NotFound lang
tryEntry (Just entry) _ = ok $ toResponse $ blogTemplate eLang eTitle $ renderEntry entry
where
eTitle = T.append ": " (title entry)
eLang = lang entry
showIndex :: AcidState Blog -> BlogLang -> ServerPart Response
showIndex acid lang = do
entries <- query' acid (LatestEntries lang)
(page :: Maybe Int) <- optional $ lookRead "page"
ok $ toResponse $ blogTemplate lang "" $
renderEntries False (eDrop page entries) (topText lang) (Just $ showLinks page lang)
where
eDrop :: Maybe Int -> [a] -> [a]
eDrop (Just i) = drop ((i-1) * 6)
eDrop Nothing = drop 0
addComment :: AcidState Blog -> BlogLang -> EntryId -> ServerPart Response
addComment acid lang eId = do
now <- liftIO $ getCurrentTime >>= return
nCtext <- lookText' "ctext"
nComment <- Comment <$> pure now
<*> lookText' "cname"
<*> pure (commentEscape nCtext)
update' acid (AddComment eId nComment)
seeOther ("/" ++ show lang ++ "/" ++ show eId) (toResponse())
commentEscape :: Text -> Text
commentEscape = newlineEscape . ltEscape . gtEscape . ampEscape
where
newlineEscape = T.replace "\n" "<br>"
ampEscape = T.replace "&" "&"
ltEscape = T.replace "<" "<"
gtEscape = T.replace ">" ">"
{- ADMIN stuff -}
postEntry :: AcidState Blog -> ServerPart Response
postEntry acid = do
decodeBody tmpPolicy
now <- liftIO $ getCurrentTime
let eId = timeToId now
lang <- look "lang"
nBtext <- lookText' "btext"
nMtext <- lookText' "mtext"
nEntry <- Entry <$> pure eId
<*> getLang lang
<*> readCookieValue "sUser"
<*> lookText' "title"
<*> pure (entryEscape nBtext)
<*> pure (entryEscape nMtext)
<*> pure now
<*> pure [] -- NYI
<*> pure []
update' acid (InsertEntry nEntry)
seeOther ("/" ++ lang ++ "/" ++ show eId) (toResponse())
where
timeToId :: UTCTime -> EntryId
timeToId t = EntryId . read $ formatTime defaultTimeLocale "%s" t
getLang :: String -> ServerPart BlogLang
getLang "de" = return DE
getLang "en" = return EN
entryEscape :: Text -> Text
entryEscape = newlineEscape . newlineRNEscape
where
newlineEscape = T.replace "\n" "<br>"
newlineRNEscape = T.replace "\r\n" "<br>"
entryList :: AcidState Blog -> BlogLang -> ServerPart Response
entryList acid lang = do
entries <- query' acid (LatestEntries lang)
ok $ toResponse $ adminEntryList entries
editEntry :: AcidState Blog -> Integer -> ServerPart Response
editEntry acid i = do
(Just entry) <- query' acid (GetEntry eId)
ok $ toResponse $ editPage entry
where
eId = EntryId i
updateEntry :: AcidState Blog -> ServerPart Response
updateEntry acid = do
decodeBody tmpPolicy
(eId :: Integer) <- lookRead "eid"
(Just entry) <- query' acid (GetEntry $ EntryId eId)
nTitle <- lookText' "title"
nBtext <- lookText' "btext"
nMtext <- lookText' "mtext"
let nEntry = entry { title = nTitle
, btext = entryEscape nBtext
, mtext = entryEscape nMtext}
update' acid (UpdateEntry nEntry)
seeOther (concat $ intersperse' "/" [show $ lang entry, show eId])
(toResponse ())
guardSession :: AcidState Blog -> ServerPartT IO ()
guardSession acid = do
(sId :: Text) <- readCookieValue "session"
(uName :: Text) <- readCookieValue "sUser"
now <- liftIO $ getCurrentTime
mS <- query' acid (GetSession $ SessionID sId)
case mS of
Nothing -> mzero
(Just Session{..}) -> unless (and [ uName == username user
, sessionTimeDiff now sdate])
mzero
where
sessionTimeDiff :: UTCTime -> UTCTime -> Bool
sessionTimeDiff now sdate = (diffUTCTime now sdate) < 43200
processLogin :: AcidState Blog -> ServerPart Response
processLogin acid = do
decodeBody tmpPolicy
account <- lookText' "account"
password <- look "password"
login <- query' acid (CheckUser (Username account) password)
if' login
(createSession account)
(ok $ toResponse $ adminLogin)
where
createSession account = do
now <- liftIO getCurrentTime
let sId = hashString $ show now
addCookie (MaxAge 43200) (mkCookie "session" $ unpack sId)
addCookie (MaxAge 43200) (mkCookie "sUser" $ T.unpack account)
(Just user) <- query' acid (GetUser $ Username account)
let nSession = Session (T.pack $ unpack sId) user now
update' acid (AddSession nSession)
seeOther ("/admin?do=login" :: Text) (toResponse())
|
