yammat/Handler/Common.hs

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-- yammat - Yet Another MateMAT
-- Copyright (C) 2015 Amedeo Molnár
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as published
-- by the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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-- | Common handler functions.
module Handler.Common where
import Data.FileEmbed (embedFile)
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import Yesod.Form.Bootstrap3
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import qualified Data.Text as T
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import qualified Data.Text.Lazy as TL
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import qualified Data.List as L
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import qualified Data.Text.Lazy.Encoding as E
import qualified Data.Text.Read as R
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import Data.Maybe
import qualified Data.Char as C
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import Yesod.Form.Functions
import Text.Shakespeare.Text
import Network.Mail.Mime
import Import
-- These handlers embed files in the executable at compile time to avoid a
-- runtime dependency, and for efficiency.
getFaviconR :: Handler TypedContent
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getFaviconR = do
cacheSeconds $ 60 * 60 * 24 * 30 -- cache for a month
return $ TypedContent "image/x-icon"
$ toContent $(embedFile "config/favicon.ico")
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getRobotsR :: Handler TypedContent
getRobotsR = return $ TypedContent typePlain
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$ toContent $(embedFile "config/robots.txt")
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msgToBSSubmit :: AppMessage -> BootstrapSubmit AppMessage
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msgToBSSubmit t = BootstrapSubmit
{ bsValue = t
, bsClasses = "btn-default"
, bsAttrs = []
}
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removeItem :: Eq a => a -> [a] -> [a]
removeItem _ [] = []
removeItem x (y:ys)
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| x == y = removeItem x ys
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| otherwise = y : (removeItem x ys)
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updateCashier :: Int -> Text -> Handler ()
updateCashier amount desc = do
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mCashier <- runDB $ selectFirst [] [Desc CashierId]
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trans <- liftIO $ (return . Transaction desc amount) =<< getCurrentTime
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case mCashier of
Just entCash -> do
runDB $ update (entityKey entCash) [CashierBalance +=. amount]
runDB $ insert_ trans
Nothing -> do
currentTime <- liftIO getCurrentTime
runDB $ insert_ $ Cashier amount currentTime
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runDB $ insert_ trans
getCashierBalance :: Handler Int
getCashierBalance = do
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mCashier <- runDB $ selectFirst [] [Desc CashierId]
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case mCashier of
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Just cashier ->
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return $ cashierBalance $ entityVal cashier
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Nothing ->
return 0
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currencyField :: (RenderMessage (HandlerSite m) FormMessage, Show a, Monad m, Integral a) => Field m a
currencyField = Field
{ fieldParse = parseHelper $ \rawVals ->
case R.double (prependZero rawVals) of
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Right (a, "") -> Right $ floor $ (100 * a) + 0.5
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_ -> Left $ MsgInvalidNumber rawVals
, fieldView = \theId name attr val req -> toWidget [hamlet|$newline never
<input id=#{theId} name=#{name} *{attr} type="number" step=0.01 min=0 :req:required="required" value=#{showVal val}>
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|]
, fieldEnctype = UrlEncoded
}
where
showVal = either id (pack . showA)
showA x = show ((fromIntegral x :: Double) / 100)
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volumeField :: (RenderMessage (HandlerSite m) FormMessage, Show a, Monad m, Integral a) => Field m a
volumeField = Field
{ fieldParse = parseHelper $ \rawVals ->
case R.double (prependZero rawVals) of
Right (a, "") -> Right $ floor $ 1000 * a
_ -> Left $ MsgInvalidNumber rawVals
, fieldView = \theId name attr val req -> toWidget [hamlet|$newline never
<input id=#{theId} name=#{name} *{attr} type="number" step=0.01 min=0 :req:required="required" value=#{showVal val}>
|]
, fieldEnctype = UrlEncoded
}
where
showVal = either id (pack . showA)
showA x = show ((fromIntegral x :: Double) / 1000)
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barcodeField :: (RenderMessage (HandlerSite m) FormMessage, Monad m) => Field m [Text]
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barcodeField = Field
{ fieldParse = parseHelper $ Right . removeItem "" . L.nub . T.splitOn ", "
, fieldView = \theId name attrs val isReq -> toWidget [hamlet|$newline never
<input type="text" id="#{theId}" name="#{name}" :isReq:required="" *{attrs} value="#{either id (T.intercalate ", ") val}">
|]
, fieldEnctype = UrlEncoded
}
handleBarcodes :: Either UserId BeverageId -> [Text] -> Handler ()
handleBarcodes (Left uId) nbs = do
raws <- runDB $ selectList [BarcodeUser ==. Just uId] []
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let obs = map (barcodeCode . entityVal) raws
let toDel = obs L.\\ nbs
let toAdd = nbs L.\\ obs
mapM_ (\b -> runDB $ insert_ $ Barcode
b
True
(Just uId)
Nothing
) toAdd
ents <- mapM (runDB . getBy . UniqueBarcode) toDel
mapM_ (runDB . delete . entityKey . fromJust) ents
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handleBarcodes (Right bId) nbs = do
raws <- runDB $ selectList [BarcodeBev ==. Just bId] []
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let obs = map (barcodeCode . entityVal) raws
let toDel = obs L.\\ nbs
let toAdd = nbs L.\\ obs
mapM_ (\b -> runDB $ insert_ $ Barcode
b
False
Nothing
(Just bId)
) toAdd
ents <- mapM (runDB . getBy . UniqueBarcode) toDel
mapM_ (runDB . delete . entityKey . fromJust) ents
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handleGetParam :: Maybe Text -> Either UserId BeverageId -> Handler ()
handleGetParam Nothing _ =
return ()
handleGetParam (Just b) eub = do
f <- return $ T.filter C.isAlphaNum b
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if T.length f > 0 && b /= ", "
then do
e <- runDB $ getBy $ UniqueBarcode f
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if isNothing e
then do
_ <- case eub of
Left uId -> do
-- should usernames containing, among other, spaces cause problems, replace b for f here
runDB $ insert_ $ Barcode b True (Just uId) Nothing
Right bId -> do
-- and here
runDB $ insert_ $ Barcode b False Nothing (Just bId)
setMessageI MsgBarcodeAdded
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else
setMessageI MsgBarcodeDuplicate
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else
setMessageI MsgProvideBarcode
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amountField :: (RenderMessage (HandlerSite m) FormMessage, Show a, Monad m, Integral a) => Field m a
amountField = Field
{ fieldParse = parseHelper $ \s ->
case R.decimal s of
Right (a, "") -> Right a
_ -> Left $ MsgInvalidInteger s
, fieldView = \theId name attr val req -> toWidget [hamlet|$newline never
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<input #crement id=#{theId} name=#{name} *{attr} type="number" step=1 min=0 :req:required="required" value="#{showVal val}">
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|]
, fieldEnctype = UrlEncoded
}
where
showVal = either id (pack . showI)
showI x = show (fromIntegral x :: Integer)
checkAlert :: BeverageId -> Int -> Handler ()
checkAlert bId oldamount = do
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bev <- runDB $ getJust bId
let alert = beverageAlertAmount bev
when (beverageAmount bev < alert && oldamount > alert) $ do
master <- getYesod
let tos = appEmail $ appSettings master
mapM_ (\to ->
liftIO $ sendMail to "Niedriger Bestand"
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[stext|
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Hallo,
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Der Bestand an #{beverageIdent bev} ist unterhalb der Warnschwelle von #{beverageAlertAmount bev}.
Der momentane Bestand ist bei #{beverageAmount bev} Artikeln.
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Viele Grüße,
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Dein Matemat
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|]
) tos
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sendMail :: MonadIO m => Text -> Text -> TL.Text -> m ()
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sendMail to subject body =
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liftIO $ renderSendMail
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Mail
{ mailFrom = Address Nothing "noreply"
, mailTo = [Address Nothing to]
, mailCc = []
, mailBcc = []
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, mailHeaders = [("Subject", subject),
("List-Id", "\"Matemat\" <matemat@matemat.hq.c3d2.de>")]
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, mailParts =[[Part
{ partType = "text/plain; charset=utf-8"
, partEncoding = None
, partFilename = Nothing
, partHeaders = []
, partContent = E.encodeUtf8 body
}]]
}
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formatIntVolume :: Int -> Text
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formatIntVolume x = formatFloat (fromIntegral x / 1000)
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--------------------------------------------------------------------------------
-- common case patterns
--------------------------------------------------------------------------------
isUser :: UserId -> Route App -> Handler User
isUser uId route = do
mUser <- runDB $ get uId
case mUser of
Nothing -> do
setMessageI MsgUserUnknown
redirectWith status404 route
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Just user ->
return user
isBeverage :: BeverageId -> Route App -> Handler Beverage
isBeverage bId route = do
mBev <- runDB $ get bId
case mBev of
Nothing -> do
setMessageI MsgItemUnknown
redirectWith status404 route
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Just bev ->
return bev