paragraph-sign: exception-safe metadata graph enumeration

Metadata graph enumeration can throw from a number
functions and break things in horrible ways.
Here we sanitize against the most egregious offenders,
but not all possible sources.

Change-Id: I40e006ea433dd7274d4fa08f3e8f8507680ef2f4
Reviewed-on: https://gerrit.libreoffice.org/63009
Tested-by: Jenkins
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>

sw/inc/rdfhelper.hxx

@@ -26,6 +26,7 @@ namespace com { namespace sun { namespace star {
         class XModel;
     }
     namespace rdf {
+        class XDocumentMetadataAccess;
         class XResource;
         class XURI;
     }
@@ -35,6 +36,11 @@ namespace com { namespace sun { namespace star {
 class SW_DLLPUBLIC SwRDFHelper
 {
 public:
+    /// Gets all graph-names in RDF of a given type.
+    static css::uno::Sequence<css::uno::Reference<css::rdf::XURI>>
+    getGraphNames(const css::uno::Reference<css::rdf::XDocumentMetadataAccess>& xDocumentMetadataAccess,
+                  const css::uno::Reference<css::rdf::XURI>& xType);
+
     /// Gets all graph-names in RDF of a given type.
     static css::uno::Sequence<css::uno::Reference<css::rdf::XURI>>
     getGraphNames(const css::uno::Reference<css::frame::XModel>& xModel, const OUString& rType);

sw/source/core/doc/rdfhelper.cxx

@@ -23,15 +23,40 @@
 
 using namespace com::sun::star;
 
+css::uno::Sequence<css::uno::Reference<css::rdf::XURI>> SwRDFHelper::getGraphNames(
+    const css::uno::Reference<rdf::XDocumentMetadataAccess>& xDocumentMetadataAccess,
+    const css::uno::Reference<rdf::XURI>& xType)
+{
+    try
+    {
+        return xDocumentMetadataAccess->getMetadataGraphsWithType(xType);
+    }
+    catch (const uno::RuntimeException&)
+    {
+        return uno::Sequence<uno::Reference<rdf::XURI>>();
+    }
+}
+
 css::uno::Sequence<uno::Reference<css::rdf::XURI>>
 SwRDFHelper::getGraphNames(const css::uno::Reference<css::frame::XModel>& xModel,
                            const OUString& rType)
 {
-    uno::Reference<uno::XComponentContext> xComponentContext(
-        comphelper::getProcessComponentContext());
-    uno::Reference<rdf::XURI> xType = rdf::URI::create(xComponentContext, rType);
-    uno::Reference<rdf::XDocumentMetadataAccess> xDocumentMetadataAccess(xModel, uno::UNO_QUERY);
-    return xDocumentMetadataAccess->getMetadataGraphsWithType(xType);
+    try
+    {
+        uno::Reference<uno::XComponentContext> xComponentContext(
+            comphelper::getProcessComponentContext());
+        // rdf::URI::create may fail with type: com.sun.star.uno.DeploymentException
+        // message: component context fails to supply service com.sun.star.rdf.URI of type com.sun.star.rdf.XURI
+        // context: cppu::ComponentContext
+        uno::Reference<rdf::XURI> xType = rdf::URI::create(xComponentContext, rType);
+        uno::Reference<rdf::XDocumentMetadataAccess> xDocumentMetadataAccess(xModel,
+                                                                             uno::UNO_QUERY);
+        return getGraphNames(xDocumentMetadataAccess, xType);
+    }
+    catch (const ::css::uno::Exception&)
+    {
+        return uno::Sequence<uno::Reference<rdf::XURI>>();
+    }
 }
 
 std::map<OUString, OUString>
@@ -76,7 +101,7 @@ void SwRDFHelper::addStatement(const css::uno::Reference<css::frame::XModel>& xM
     uno::Reference<uno::XComponentContext> xComponentContext(comphelper::getProcessComponentContext());
     uno::Reference<rdf::XURI> xType = rdf::URI::create(xComponentContext, rType);
     uno::Reference<rdf::XDocumentMetadataAccess> xDocumentMetadataAccess(xModel, uno::UNO_QUERY);
-    uno::Sequence< uno::Reference<rdf::XURI> > aGraphNames = xDocumentMetadataAccess->getMetadataGraphsWithType(xType);
+    const uno::Sequence< uno::Reference<rdf::XURI> > aGraphNames = getGraphNames(xDocumentMetadataAccess, xType);
     uno::Reference<rdf::XURI> xGraphName;
     if (aGraphNames.hasElements())
         xGraphName = aGraphNames[0];
@@ -96,8 +121,7 @@ bool SwRDFHelper::hasMetadataGraph(const css::uno::Reference<css::frame::XModel>
     uno::Reference<uno::XComponentContext> xComponentContext(comphelper::getProcessComponentContext());
     uno::Reference<rdf::XURI> xType = rdf::URI::create(xComponentContext, rType);
     uno::Reference<rdf::XDocumentMetadataAccess> xDocumentMetadataAccess(xModel, uno::UNO_QUERY);
-    uno::Sequence< uno::Reference<rdf::XURI> > aGraphNames = xDocumentMetadataAccess->getMetadataGraphsWithType(xType);
-    return aGraphNames.hasElements();
+    return getGraphNames(xDocumentMetadataAccess, xType).hasElements();
 }
 
 void SwRDFHelper::removeStatement(const css::uno::Reference<css::frame::XModel>& xModel,
@@ -108,7 +132,7 @@ void SwRDFHelper::removeStatement(const css::uno::Reference<css::frame::XModel>&
     uno::Reference<uno::XComponentContext> xComponentContext(comphelper::getProcessComponentContext());
     uno::Reference<rdf::XURI> xType = rdf::URI::create(xComponentContext, rType);
     uno::Reference<rdf::XDocumentMetadataAccess> xDocumentMetadataAccess(xModel, uno::UNO_QUERY);
-    uno::Sequence< uno::Reference<rdf::XURI> > aGraphNames = xDocumentMetadataAccess->getMetadataGraphsWithType(xType);
+    const uno::Sequence< uno::Reference<rdf::XURI> > aGraphNames = getGraphNames(xDocumentMetadataAccess, xType);
     if (!aGraphNames.hasElements())
         return;
 
@@ -125,7 +149,7 @@ void SwRDFHelper::clearStatements(const css::uno::Reference<css::frame::XModel>&
     uno::Reference<uno::XComponentContext> xComponentContext(comphelper::getProcessComponentContext());
     uno::Reference<rdf::XURI> xType = rdf::URI::create(xComponentContext, rType);
     uno::Reference<rdf::XDocumentMetadataAccess> xDocumentMetadataAccess(xModel, uno::UNO_QUERY);
-    uno::Sequence< uno::Reference<rdf::XURI> > aGraphNames = xDocumentMetadataAccess->getMetadataGraphsWithType(xType);
+    const uno::Sequence< uno::Reference<rdf::XURI> > aGraphNames = getGraphNames(xDocumentMetadataAccess, xType);
     if (!aGraphNames.hasElements())
         return;
 
@@ -152,7 +176,7 @@ void SwRDFHelper::cloneStatements(const css::uno::Reference<css::frame::XModel>&
     uno::Reference<uno::XComponentContext> xComponentContext(comphelper::getProcessComponentContext());
     uno::Reference<rdf::XURI> xType = rdf::URI::create(xComponentContext, rType);
     uno::Reference<rdf::XDocumentMetadataAccess> xDocumentMetadataAccess(xSrcModel, uno::UNO_QUERY);
-    uno::Sequence< uno::Reference<rdf::XURI> > aGraphNames = xDocumentMetadataAccess->getMetadataGraphsWithType(xType);
+    const uno::Sequence< uno::Reference<rdf::XURI> > aGraphNames = getGraphNames(xDocumentMetadataAccess, xType);
     if (!aGraphNames.hasElements())
         return;
 
@@ -188,7 +212,7 @@ void SwRDFHelper::removeTextNodeStatement(const OUString& rType, SwTextNode& rTe
     uno::Reference<uno::XComponentContext> xComponentContext(comphelper::getProcessComponentContext());
     uno::Reference<rdf::XURI> xType = rdf::URI::create(xComponentContext, rType);
     uno::Reference<rdf::XDocumentMetadataAccess> xDocumentMetadataAccess(rTextNode.GetDoc()->GetDocShell()->GetBaseModel(), uno::UNO_QUERY);
-    uno::Sequence< uno::Reference<rdf::XURI> > aGraphNames = xDocumentMetadataAccess->getMetadataGraphsWithType(xType);
+    const uno::Sequence< uno::Reference<rdf::XURI> > aGraphNames = getGraphNames(xDocumentMetadataAccess, xType);
     if (!aGraphNames.hasElements())
         return;
 
@@ -205,7 +229,7 @@ void SwRDFHelper::updateTextNodeStatement(const OUString& rType, const OUString&
     uno::Reference<uno::XComponentContext> xComponentContext(comphelper::getProcessComponentContext());
     uno::Reference<rdf::XURI> xType = rdf::URI::create(xComponentContext, rType);
     uno::Reference<rdf::XDocumentMetadataAccess> xDocumentMetadataAccess(rTextNode.GetDoc()->GetDocShell()->GetBaseModel(), uno::UNO_QUERY);
-    uno::Sequence< uno::Reference<rdf::XURI> > aGraphNames = xDocumentMetadataAccess->getMetadataGraphsWithType(xType);
+    const uno::Sequence< uno::Reference<rdf::XURI> > aGraphNames = getGraphNames(xDocumentMetadataAccess, xType);
     uno::Reference<rdf::XURI> xGraphName;
     if (aGraphNames.hasElements())
     {