[Libreoffice-commits] core.git: filter/Library_xmlfd.mk filter/source

[Mike Kaganski]

 filter/Library_xmlfd.mk                        |    1 
 filter/source/xmlfilterdetect/filterdetect.cxx |   47 +++++++++++++++++++++++--
 2 files changed, 45 insertions(+), 3 deletions(-)

New commits:
commit 156f778593ca9c57845076a88c6b544a63e12e7a
Author: Mike Kaganski <mike.kaganski at collabora.com>
Date:   Tue Apr 4 22:37:45 2017 +0300

    tdf#106955: Detect XML by MediaType
    
    According to Extensible Markup Language (XML) 1.0 (see
    https://www.w3.org/TR/2008/REC-xml-20081126/#sec-prolog-dtd),
    all parts of XML prolog (including XML declaration) are optional,
    so XML stream without <?xml ... ?> is well-formed (though not
    valid).
    
    XMLFilterDetect uses only XML declaration to detect if the file is
    to be processed further. However, this creates problems with said
    documents.
    
    This commit checks if the document has MediaType set to one of
    known XML media types, in case when the check for XML declaration
    failed.
    
    Change-Id: I31627c0e3a39bee241f609650280ebac3f1cede8
    Reviewed-on: https://gerrit.libreoffice.org/36101
    Tested-by: Jenkins <ci at libreoffice.org>
    Reviewed-by: Mike Kaganski <mike.kaganski at collabora.com>

diff --git a/filter/Library_xmlfd.mk b/filter/Library_xmlfd.mk
index 54fdd0aa01e9..601a7678312b 100644
--- a/filter/Library_xmlfd.mk
+++ b/filter/Library_xmlfd.mk
@@ -30,6 +30,7 @@ $(eval $(call gb_Library_use_libraries,xmlfd,\
 	cppuhelper \
 	cppu \
 	sal \
+	svl \
 	utl \
 	tl \
 	$(gb_UWINAPI) \
diff --git a/filter/source/xmlfilterdetect/filterdetect.cxx b/filter/source/xmlfilterdetect/filterdetect.cxx
index 9916b2cee94d..b8937fbd7608 100644
--- a/filter/source/xmlfilterdetect/filterdetect.cxx
+++ b/filter/source/xmlfilterdetect/filterdetect.cxx
@@ -27,6 +27,7 @@
 #include <cppuhelper/supportsservice.hxx>
 #include <ucbhelper/content.hxx>
 #include <unotools/ucbstreamhelper.hxx>
+#include <svl/inettype.hxx>
 #include <memory>
 
 using namespace com::sun::star::container;
@@ -49,6 +50,25 @@ OUString supportedByType( const OUString& clipBoardFormat,  const OUString& resu
     return sTypeName;
 }
 
+bool IsMediaTypeXML( const OUString& mediaType )
+{
+    if (!mediaType.isEmpty())
+    {
+        OUString sType, sSubType;
+        INetContentTypes::parse(mediaType, sType, sSubType);
+        if (sType.equalsIgnoreAsciiCase("application"))
+        {
+            // RFC 3023: application/xml; don't detect text/xml
+            if (sSubType.equalsIgnoreAsciiCase("xml"))
+                return true;
+            // Registered media types: application/XXXX+xml
+            if (sSubType.endsWithIgnoreAsciiCase("+xml"))
+                return true;
+        }
+    }
+    return false;
+}
+
 }
 
 OUString SAL_CALL FilterDetect::detect( css::uno::Sequence< css::beans::PropertyValue >& aArguments )
@@ -125,9 +145,30 @@ OUString SAL_CALL FilterDetect::detect( css::uno::Sequence< css::beans::Property
             resultString = read_uInt16s_ToOUString( *pInStream, nSize );
 
         if ( !resultString.startsWith( "<?xml" ) )
-            // This is not an XML stream.  It makes no sense to try to detect
-            // a non-XML file type here.
-            return OUString();
+        {
+            // Check the content type; XML declaration is optional in XML files according to XML 1.0 ch.2.8
+            // (see https://www.w3.org/TR/2008/REC-xml-20081126/#sec-prolog-dtd)
+            OUString sMediaType;
+            try
+            {
+                ::ucbhelper::Content aContent(
+                    sUrl, Reference< css::ucb::XCommandEnvironment >(),
+                    mxCtx);
+                aContent.getPropertyValue("MediaType") >>= sMediaType;
+                if (sMediaType.isEmpty())
+                {
+                    aContent.getPropertyValue("Content-Type") >>= sMediaType;
+                }
+            }
+            catch (...) {}
+
+            if (!IsMediaTypeXML(sMediaType))
+            {
+                // This is not an XML stream.  It makes no sense to try to detect
+                // a non-XML file type here.
+                return OUString();
+            }
+        }
 
         // test typedetect code
         Reference <XNameAccess> xTypeCont(mxCtx->getServiceManager()->createInstanceWithContext("com.sun.star.document.TypeDetection", mxCtx), UNO_QUERY);