FB2: support images embedded as data URIs + tests.

4 files changed, 75 insertions, 12 deletions

diff --git a/src/Tests/Old.hs b/src/Tests/Old.hs
index c6952520c..0400b0324 100644
--- a/src/Tests/Old.hs
+++ b/src/Tests/Old.hs
@@ -111,6 +111,7 @@ tests = [ testGroup "markdown"
           [ fb2WriterTest "basic" [] "fb2.basic.markdown" "fb2.basic.fb2"
           , fb2WriterTest "titles" [] "fb2.titles.markdown" "fb2.titles.fb2"
           , fb2WriterTest "images" [] "fb2.images.markdown" "fb2.images.fb2"
+          , fb2WriterTest "images-embedded" [] "fb2.images-embedded.html" "fb2.images-embedded.fb2"
           , fb2WriterTest "tables" [] "tables.native" "tables.fb2"
           , fb2WriterTest "math" [] "fb2.math.markdown" "fb2.math.fb2"
           , fb2WriterTest "math-webtex" ["--webtex"] "fb2.math.markdown" "fb2.math-webtex.fb2"
diff --git a/src/Text/Pandoc/Writers/FB2.hs b/src/Text/Pandoc/Writers/FB2.hs
index 924ffd819..0fbfb3968 100644
--- a/src/Text/Pandoc/Writers/FB2.hs
+++ b/src/Text/Pandoc/Writers/FB2.hs
@@ -28,8 +28,8 @@ module Text.Pandoc.Writers.FB2 (writeFB2)  where
 import Control.Monad.State (StateT, evalStateT, get, modify)
 import Control.Monad.State (liftM, liftM2, liftIO)
 import Data.ByteString.Base64 (encode)
-import Data.Char (toUpper, toLower, isSpace)
-import Data.List (intersperse, intercalate)
+import Data.Char (toUpper, toLower, isSpace, isAscii, isControl)
+import Data.List (intersperse, intercalate, isPrefixOf)
 import Data.Either (lefts, rights)
 import Network.Browser (browse, request, setAllowRedirects, setOutHandler)
 import Network.HTTP (catchIO_, getRequest, getHeaders, getResponseBody)
@@ -220,9 +220,15 @@ fetchImages links = do
 fetchImage :: String -> String -> IO (Either String Content)
 fetchImage href link = do
   mbimg <-
-      if isURI link
-      then fetchURL link
-      else do
+      case (isURI link, readDataURI link) of
+       (True, Just (mime,_,True,base64)) ->
+           let mime' = map toLower mime
+           in if mime' == "image/png" || mime' == "image/jpeg"
+              then return (Just (mime',base64))
+              else return Nothing
+       (True, Just _) -> return Nothing  -- not base64-encoded
+       (True, Nothing) -> fetchURL link
+       (False, _) -> do
         d <- nothingOnError $ B.readFile (unEscapeString link)
         let t = case map toLower (takeExtension link) of
                   ".png" -> Just "image/png"
@@ -230,15 +236,13 @@ fetchImage href link = do
                   ".jpeg" -> Just "image/jpeg"
                   ".jpe" -> Just "image/jpeg"
                   _ -> Nothing  -- only PNG and JPEG are supported in FB2
-        return $ liftM2 (,) t d
+        return $ liftM2 (,) t (liftM (toStr . encode) d)
   case mbimg of
     Just (imgtype, imgdata) -> do
-        let encdata = encode imgdata
-        let encstr = map (toEnum . fromEnum) . B.unpack $ encdata
         return . Right $ el "binary"
                    ( [uattr "id" href
                      , uattr "content-type" imgtype]
-                   , txt encstr )
+                   , txt imgdata )
     _ -> return (Left ('#':href))
   where
    nothingOnError :: (IO B.ByteString) -> (IO (Maybe B.ByteString))
@@ -246,8 +250,45 @@ fetchImage href link = do
    omnihandler :: E.SomeException -> IO (Maybe B.ByteString)
    omnihandler _ = return Nothing
 
+-- | Extract mime type and encoded data from the Data URI.
+readDataURI :: String -- ^ URI
+            -> Maybe (String,String,Bool,String)
+               -- ^ Maybe (mime,charset,isBase64,data)
+readDataURI uri =
+    let prefix = "data:"
+    in  if not (prefix `isPrefixOf` uri)
+        then Nothing
+        else
+            let rest = drop (length prefix) uri
+                meta = takeWhile (/= ',') rest  -- without trailing ','
+                uridata = drop (length meta + 1) rest
+                parts = split (== ';') meta
+                (mime,cs,enc)=foldr upd ("text/plain","US-ASCII",False) parts
+            in  Just (mime,cs,enc,uridata)
+ where
+   upd str m@(mime,cs,enc)
+       | isMimeType str               = (str,cs,enc)
+       | "charset=" `isPrefixOf` str  = (mime,drop (length "charset=") str,enc)
+       | str ==  "base64"             = (mime,cs,True)
+       | otherwise                    = m
+
+-- Without parameters like ;charset=...; see RFC 2045, 5.1
+isMimeType :: String -> Bool
+isMimeType s =
+    case split (=='/') s of
+      [mtype,msubtype] ->
+          ((map toLower mtype) `elem` types
+           || "x-" `isPrefixOf` (map toLower mtype))
+          && all valid mtype
+          && all valid msubtype
+      _ -> False
+ where
+   types =  ["text","image","audio","video","application","message","multipart"]
+   valid c = isAscii c && not (isControl c) && not (isSpace c) &&
+             c `notElem` "()<>@,;:\\\"/[]?="
+
 -- | Fetch URL, return its Content-Type and binary data on success.
-fetchURL :: String -> IO (Maybe (String, B.ByteString))
+fetchURL :: String -> IO (Maybe (String, String))
 fetchURL url = do
   flip catchIO_ (return Nothing) $ do
      r <- browse $ do
@@ -255,10 +296,15 @@ fetchURL url = do
            setAllowRedirects True
            liftM snd . request . getRequest $ url
      let content_type = lookupHeader HdrContentType (getHeaders r)
-     content <- liftM (Just . toBS) . getResponseBody $ Right r
+     content <- liftM (Just . toStr . encode . toBS) . getResponseBody $ Right r
      return $ liftM2 (,) content_type content
   where
-    toBS = B.pack . map (toEnum . fromEnum)
+
+toBS :: String -> B.ByteString
+toBS = B.pack . map (toEnum . fromEnum)
+
+toStr :: B.ByteString -> String
+toStr = map (toEnum . fromEnum) . B.unpack
 
 footnoteID :: Int -> String
 footnoteID i = "n" ++ (show i)
diff --git a/tests/fb2.images-embedded.fb2 b/tests/fb2.images-embedded.fb2
new file mode 100644
index 000000000..373eda7ff
--- /dev/null
+++ b/tests/fb2.images-embedded.fb2
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FictionBook xmlns="http://www.gribuser.ru/xml/fictionbook/2.0" xmlns:l="http://www.w3.org/1999/xlink"><description><title-info /><document-info><program-used>pandoc</program-used></document-info></description><body><title><p /></title><annotation><p></p></annotation><section><image l:href="#image1" l:type="imageType" alt="This image was embedded using data URI scheme" /><p>This image was embedded using data URI scheme</p></section></body><binary id="image1" content-type="image/png">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</binary></FictionBook>
\ No newline at end of file
diff --git a/tests/fb2.images-embedded.html b/tests/fb2.images-embedded.html
new file mode 100644
index 000000000..19c8f7c7a
--- /dev/null
+++ b/tests/fb2.images-embedded.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+  <meta http-equiv="Content-Style-Type" content="text/css" />
+  <meta name="generator" content="pandoc" />
+  <title></title>
+</head>
+<body>
+<div class="figure">
+<img 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