sw: store paragraph signature as rdf metadata

Change-Id: I13e6079e2aa3bee3dac10b11b0a23e9b798e02a3
Reviewed-on: https://gerrit.libreoffice.org/40722Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>

sw/inc/rdfhelper.hxx

@@ -22,10 +22,17 @@ class SwTextNode;
 class SW_DLLPUBLIC SwRDFHelper
 {
 public:
-    /// Gets all (rNode, key, value) statements in RDF graphs of type rType.
-    static std::map<OUString, OUString> getTextNodeStatements(const OUString& rType, const SwTextNode& rNode);
+    /// Gets all (rTextNode, key, value) statements in RDF graphs of type rType.
+    static std::map<OUString, OUString> getTextNodeStatements(const OUString& rType, const SwTextNode& rTextNode);
+
     /// Add an (rTextNode, key, value) statement in the graph of type rType -- or if it does not exist, create a graph at rPath first.
     static void addTextNodeStatement(const OUString& rType, const OUString& rPath, SwTextNode& rTextNode, const OUString& rKey, const OUString& rValue);
+
+    /// Remove an (rTextNode, key, value) statement in the graph of type rType.
+    static void removeTextNodeStatement(const OUString& rType, SwTextNode& rTextNode, const OUString& rKey, const OUString& rValue);
+
+    /// Update an (rTextNode, key, value) statement in the graph of type rType from old value to new. Creates the graph at rPath if doesn't exist.
+    static void updateTextNodeStatement(const OUString& rType, const OUString& rPath, SwTextNode& rTextNode, const OUString& rKey, const OUString& rOldValue, const OUString& rNewValue);
 };
 
 #endif // INCLUDED_SW_INC_RDFHELPER_HXX

sw/source/core/doc/rdfhelper.cxx

@@ -73,4 +73,54 @@ void SwRDFHelper::addTextNodeStatement(const OUString& rType, const OUString& rP
     xGraph->addStatement(xSubject, xKey, xValue);
 }
 
+void SwRDFHelper::removeTextNodeStatement(const OUString& rType, SwTextNode& rTextNode, const OUString& rKey, const OUString& rValue)
+{
+    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);
+    if (!aGraphNames.hasElements())
+        return;
+
+    uno::Reference<rdf::XURI> xGraphName = aGraphNames[0];
+    uno::Reference<rdf::XNamedGraph> xGraph = xDocumentMetadataAccess->getRDFRepository()->getGraph(xGraphName);
+    uno::Reference<rdf::XResource> xSubject(SwXParagraph::CreateXParagraph(*rTextNode.GetDoc(), &rTextNode), uno::UNO_QUERY);
+    uno::Reference<rdf::XURI> xKey = rdf::URI::create(xComponentContext, rKey);
+    uno::Reference<rdf::XLiteral> xValue = rdf::Literal::create(xComponentContext, rValue);
+    xGraph->removeStatements(xSubject, xKey, xValue);
+}
+
+void SwRDFHelper::updateTextNodeStatement(const OUString& rType, const OUString& rPath, SwTextNode& rTextNode, const OUString& rKey, const OUString& rOldValue, const OUString& rNewValue)
+{
+    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);
+    uno::Reference<rdf::XURI> xGraphName;
+    if (aGraphNames.hasElements())
+    {
+        xGraphName = aGraphNames[0];
+    }
+    else
+    {
+        uno::Sequence< uno::Reference<rdf::XURI> > xTypes = { xType };
+        xGraphName = xDocumentMetadataAccess->addMetadataFile(rPath, xTypes);
+    }
+
+    uno::Reference<rdf::XNamedGraph> xGraph = xDocumentMetadataAccess->getRDFRepository()->getGraph(xGraphName);
+    uno::Reference<rdf::XResource> xSubject(SwXParagraph::CreateXParagraph(*rTextNode.GetDoc(), &rTextNode), uno::UNO_QUERY);
+    uno::Reference<rdf::XURI> xKey = rdf::URI::create(xComponentContext, rKey);
+
+    if (aGraphNames.hasElements())
+    {
+        // Remove the old value.
+        uno::Reference<rdf::XLiteral> xOldValue = rdf::Literal::create(xComponentContext, rOldValue);
+        xGraph->removeStatements(xSubject, xKey, xOldValue);
+    }
+
+    // Now add it with new value.
+    uno::Reference<rdf::XLiteral> xNewValue = rdf::Literal::create(xComponentContext, rNewValue);
+    xGraph->addStatement(xSubject, xKey, xNewValue);
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

sw/source/core/edit/edfcol.cxx

@@ -60,6 +60,7 @@
 #include <unoprnms.hxx>
 #include <rootfrm.hxx>
 #include <pagefrm.hxx>
+#include <rdfhelper.hxx>
 #include <sfx2/watermarkitem.hxx>
 
 #include <cppuhelper/bootstrap.hxx>
@@ -579,17 +580,32 @@ void SwEditShell::SignParagraph(SwPaM* pPaM)
         // 3. Sign it.
         svl::crypto::Signing signing(xCert);
         signing.AddDataRange(text.getStr(), text.getLength());
-        OStringBuffer signature;
-        if (!signing.Sign(signature))
+        OStringBuffer sigBuf;
+        if (!signing.Sign(sigBuf))
             return;
 
+        const OString signature = sigBuf.makeStringAndClear();
         const auto pData = reinterpret_cast<const unsigned char*>(text.getStr());
         const std::vector<unsigned char> data(pData, pData + text.getLength());
-        const std::vector<unsigned char> sig(svl::crypto::DecodeHexString(signature.makeStringAndClear()));
+        const std::vector<unsigned char> sig(svl::crypto::DecodeHexString(signature));
         if (!svl::crypto::Signing::Verify(data, true, sig, aInfo))
             return;
 
-        // 4. Add metadata.
+        // 4. Add metadata
+        static const OUString metaNS("urn:bails");
+        static const OUString metaFile("bails.rdf");
+
+        std::map<OUString, OUString> aStatements = SwRDFHelper::getTextNodeStatements(metaNS, *pNode);
+        OUString name = "loext:signature:index";
+        const OUString indexOld = aStatements[name];
+
+        // Update the index
+        const OUString index = OUString::number(indexOld.isEmpty() ? 1 : (indexOld.toInt32() + 1));
+        SwRDFHelper::updateTextNodeStatement(metaNS, metaFile, *pNode, name, indexOld, index);
+
+        // Add the signature
+        name = "loext:signature:signature" + index;
+        SwRDFHelper::addTextNodeStatement(metaNS, metaFile, *pNode, name, OStringToOUString(signature, RTL_TEXTENCODING_UTF8, 0));
     }
 }