module LWN.HTTP
where
+import qualified Data.ByteString as B (hPut)
import Network.Curl (
CurlCode(..),
CurlOption(..),
respCurlCode,
withCurlDo
)
+import Network.Curl.Download (openURI)
+import System.Directory (getTemporaryDirectory)
import System.IO (hPutStrLn, stderr)
+import System.IO.Temp (openBinaryTempFile)
+
+import LWN.URI (filename)
login_url :: URLString
login_url = "https://lwn.net/login"
curl_opts :: [CurlOption]
curl_opts = default_curl_opts ++ post_opts
+
+
+-- | Save the image at 'url'. Saves to a temporary file, and
+-- returns the path to that file if successful. Otherwise,
+-- returns 'Nothing'.
+--
+-- We need to be able to parse the filename out of the URL
+-- so that when we stick our image in the document, the reader
+-- knows that type (jpg, png, etc.) it is.
+save_image :: URLString -> IO (Maybe FilePath)
+save_image url = do
+ let fn = filename url
+ case fn of
+ Nothing -> return Nothing
+ Just file -> do
+ temp_dir <- getTemporaryDirectory
+ (out_path, out_handle) <- openBinaryTempFile temp_dir file
+ result <- openURI url
+ case result of
+ Left err -> do
+ hPutStrLn stderr ("HTTP Error: " ++ err)
+ return Nothing
+ Right bs -> do
+ B.hPut out_handle bs
+ return $ Just out_path