blob: 284ab22d95c1bcc4d659d1fadefb5a9e946f6398 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
{-# LANGUAGE OverloadedStrings #-}
module F2Md.Export (writeMessage) where
import F2Md.Types
import Data.Text (Text)
import qualified Data.Text as T
import System.Posix.Process
import System.Posix.Files
import Data.Time
import Network.HostName
import System.Random
import System.FilePath
formatMessage :: Message -> Text
formatMessage (Message from subject date messageId body) =
"MIME-Version: 1.0\n" <> "Date: " <> date <> "\nSubject: " <> subject <>
"\nFrom: " <> from <> "\nMessage-ID: " <> messageId <>
"\nContent-Type: text/html" <> "\n\n" <> body
genFilename :: FilePath -> IO String
genFilename root = do
epoch <- formatTime defaultTimeLocale "%s" <$> getCurrentTime
pid <- getProcessID
host <- getHostName
rand <- randomRIO (10000, 99999) :: IO Int
return $ root </> "new" </> epoch <> "." <> show pid <> "." <>
host <> "." <> show rand
genUniqFilename :: FilePath -> IO String
genUniqFilename root = do
filename <- genFilename root
exists <- fileExist filename
if exists then genUniqFilename root else return filename
writeMessage :: FilePath -> Message -> IO ()
writeMessage root msg =
genUniqFilename root >>=
\filename -> writeFile filename $ T.unpack (formatMessage msg)
|
