X-Git-Url: http://gitweb.michael.orlitzky.com/?p=dead%2Flwn-epub.git;a=blobdiff_plain;f=src%2FLWN%2FHTTP.hs;h=71058dc67040b69da700e2744fe1daa796ae3607;hp=8b4c14d0cc04a09badc271f15bd0ea628ca24390;hb=8202cb1437ece6be41677c0bbdae4713041199ac;hpb=241e9b547e48d4af7eb37ca6989775c0d09152bc

diff --git a/src/LWN/HTTP.hs b/src/LWN/HTTP.hs
index 8b4c14d..71058dc 100644
--- a/src/LWN/HTTP.hs
+++ b/src/LWN/HTTP.hs
@@ -1,6 +1,10 @@
+{-# LANGUAGE DoAndIfThenElse #-}
+
 module LWN.HTTP
 where
 
+import qualified Data.ByteString as B (hPut)
+
 import Network.Curl (
   CurlCode(..),
   CurlOption(..),
@@ -10,9 +14,14 @@ import Network.Curl (
   initialize,
   respBody,
   respCurlCode,
-  withCurlDo               
+  withCurlDo
   )
-import System.IO (hPutStrLn, stderr)
+import Network.Curl.Download (openURI)
+import System.Directory (doesFileExist, getTemporaryDirectory)
+import System.IO (hClose, hPutStrLn, stderr)
+import System.IO.Temp (openBinaryTempFile, openTempFile)
+
+import LWN.URI (filename)
 
 login_url :: URLString
 login_url = "https://lwn.net/login"
@@ -35,16 +44,23 @@ default_curl_opts =
     -- And we don't want to use a DNS cache anyway.
     CurlDNSCacheTimeout 0,
 
-    -- Give it a little time...
-    CurlTimeout 45,
+    -- Follow redirects.
+    CurlFollowLocation True,
 
-    -- And let us know when things go wrong.
-    CurlVerbose True ]
+    -- Give it a little time...
+    CurlTimeout 45 ]
 
 
+make_cookie_jar :: IO FilePath
+make_cookie_jar = do
+  temp_dir <- getTemporaryDirectory
+  let file_name_template = "lwn-epub-cookies.txt"
+  (out_path, out_handle) <- openTempFile temp_dir file_name_template
+  hClose out_handle -- We just want to create it for now.
+  return out_path
 
-get_page :: Maybe FilePath -> URLString -> IO (Maybe String)
-get_page cookie_jar url =
+get_page :: Maybe FilePath -> URLString -> IO (Either String String)
+get_page cookie_file url =
   withCurlDo $ do
     -- Create a curl instance.
     curl <- initialize
@@ -52,29 +68,30 @@ get_page cookie_jar url =
     -- Perform the request, and get back a CurlResponse object.
     -- The cast is needed to specify how we would like our headers
     -- and body returned (Strings).
-    resp <- do_curl_ curl login_url curl_opts :: IO CurlResponse
+    resp <- do_curl_ curl url curl_opts :: IO CurlResponse
 
     -- Pull out the response code as a CurlCode.
     let code = respCurlCode resp
 
-    case code of
-      CurlOK -> return $ Just (respBody resp)
-      error_code -> do
-        hPutStrLn stderr ("HTTP Error: " ++ (show error_code))
+    return $
+      case code of
+        CurlOK -> Right (respBody resp)
+        error_code -> Left ("HTTP Error: " ++ (show error_code))
         -- If an error occurred, we want to dump as much information as
         -- possible. If this becomes a problem, we can use respGetInfo to
         -- query the response object for more information
-        return Nothing
   where
     get_opts =
-      case cookie_jar of
+      case cookie_file of
         Nothing -> []
-        Just cookies -> [ CurlCookieJar cookies ]
+        Just cookies -> [ CurlCookieFile cookies ]
 
     curl_opts = default_curl_opts ++ get_opts
 
 
-log_in :: FilePath -> String -> String -> IO Bool
+-- | Log in using curl. Store the resulting session cookies in the
+--   supplied file.
+log_in :: FilePath -> String -> String -> IO (Either String String)
 log_in cookie_jar username password =
   withCurlDo $ do
     -- Create a curl instance.
@@ -88,14 +105,13 @@ log_in cookie_jar username password =
     -- Pull out the response code as a CurlCode.
     let code = respCurlCode resp
 
-    case code of
-      CurlOK -> return True
-      error_code -> do
-        hPutStrLn stderr ("HTTP Error: " ++ (show error_code))
+    return $
+      case code of
+        CurlOK -> Right (respBody resp)
+        error_code -> Left $ "HTTP Error: " ++ (show error_code)
         -- If an error occurred, we want to dump as much information as
         -- possible. If this becomes a problem, we can use respGetInfo to
         -- query the response object for more information
-        return False
   where
     post_submit :: String
     post_submit = submit_field ++ "=Log+In"
@@ -107,7 +123,7 @@ log_in cookie_jar username password =
     post_password = password_field ++ "=" ++ password
 
     post_data :: [String]
-    post_data = [post_username, post_password]
+    post_data = [post_username, post_password, post_submit]
 
     post_opts :: [CurlOption]
     post_opts =
@@ -118,3 +134,33 @@ log_in cookie_jar username password =
         
     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
+  it_exists <- doesFileExist url
+  if it_exists then do
+    -- It's local, just use it.
+    return $ Just url
+  else 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