1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
2 /*
3  * This file is part of the LibreOffice project.
4  *
5  * This Source Code Form is subject to the terms of the Mozilla Public
6  * License, v. 2.0. If a copy of the MPL was not distributed with this
7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8  */
9 
10 #include "SignatureLineContext.hxx"
11 
12 #include <com/sun/star/beans/XPropertySet.hpp>
13 #include <com/sun/star/embed/XStorage.hpp>
14 #include <com/sun/star/frame/XStorable.hpp>
15 #include <com/sun/star/graphic/XGraphic.hpp>
16 #include <com/sun/star/security/DocumentDigitalSignatures.hpp>
17 #include <com/sun/star/security/XDocumentDigitalSignatures.hpp>
18 #include <com/sun/star/xml/sax/XAttributeList.hpp>
19 
20 #include <sal/log.hxx>
21 #include <comphelper/processfactory.hxx>
22 #include <comphelper/storagehelper.hxx>
23 #include <xmloff/xmltoken.hxx>
24 #include <xmloff/xmlimp.hxx>
25 
26 using namespace css;
27 using namespace css::xml::sax;
28 using namespace css::uno;
29 using namespace css::drawing;
30 using namespace css::embed;
31 using namespace css::frame;
32 using namespace css::io;
33 using namespace css::graphic;
34 using namespace css::security;
35 using namespace xmloff::token;
36 
SignatureLineContext(SvXMLImport & rImport,sal_uInt16 nPrfx,const OUString & rLocalName,const Reference<XAttributeList> & xAttrList,const Reference<XShape> & rxShape)37 SignatureLineContext::SignatureLineContext(SvXMLImport& rImport, sal_uInt16 nPrfx,
38                                            const OUString& rLocalName,
39                                            const Reference<XAttributeList>& xAttrList,
40                                            const Reference<XShape>& rxShape)
41     : SvXMLImportContext(rImport, nPrfx, rLocalName)
42 {
43     Reference<beans::XPropertySet> xPropSet(rxShape, UNO_QUERY_THROW);
44 
45     xPropSet->setPropertyValue("IsSignatureLine", Any(true));
46 
47     xPropSet->setPropertyValue("SignatureLineId", Any(xAttrList->getValueByName("loext:id")));
48     xPropSet->setPropertyValue("SignatureLineSuggestedSignerName",
49                                Any(xAttrList->getValueByName("loext:suggested-signer-name")));
50     xPropSet->setPropertyValue("SignatureLineSuggestedSignerTitle",
51                                Any(xAttrList->getValueByName("loext:suggested-signer-title")));
52     xPropSet->setPropertyValue("SignatureLineSuggestedSignerEmail",
53                                Any(xAttrList->getValueByName("loext:suggested-signer-email")));
54     xPropSet->setPropertyValue("SignatureLineSigningInstructions",
55                                Any(xAttrList->getValueByName("loext:signing-instructions")));
56 
57     bool bShowSignDate = xAttrList->getValueByName("loext:show-sign-date") == GetXMLToken(XML_TRUE);
58     bool bCanAddComment
59         = xAttrList->getValueByName("loext:can-add-comment") == GetXMLToken(XML_TRUE);
60     xPropSet->setPropertyValue("SignatureLineShowSignDate", Any(bShowSignDate));
61     xPropSet->setPropertyValue("SignatureLineCanAddComment", Any(bCanAddComment));
62 
63     // Save unsigned graphic (need it when exporting)
64     Reference<XGraphic> xUnsignedGraphic;
65     xPropSet->getPropertyValue("Graphic") >>= xUnsignedGraphic;
66     if (xUnsignedGraphic.is())
67         xPropSet->setPropertyValue("SignatureLineUnsignedImage", Any(xUnsignedGraphic));
68 
69     Reference<XGraphic> xGraphic;
70     bool bIsSigned(false);
71     try
72     {
73         // Get the document signatures
74         Reference<XDocumentDigitalSignatures> xSignatures(
75             security::DocumentDigitalSignatures::createWithVersion(
76                 comphelper::getProcessComponentContext(), "1.2"));
77 
78         css::uno::Reference<XStorable> xStorable(GetImport().GetModel(), UNO_QUERY_THROW);
79         Reference<XStorage> xStorage = comphelper::OStorageHelper::GetStorageOfFormatFromURL(
80             ZIP_STORAGE_FORMAT_STRING, xStorable->getLocation(), ElementModes::READ);
81 
82         if (!xStorage.is())
83         {
84             SAL_WARN("xmloff", "No xStorage!");
85             return;
86         }
87 
88         Sequence<DocumentSignatureInformation> xSignatureInfo
89             = xSignatures->verifyDocumentContentSignatures(xStorage, Reference<XInputStream>());
90 
91         // Try to find matching signature line image - if none exists that is fine,
92         // then the signature line is not digitally signed.
93         auto pSignatureInfo = std::find_if(
94             xSignatureInfo.begin(), xSignatureInfo.end(),
95             [&xAttrList](const DocumentSignatureInformation& rSignatureInfo) {
96                 return rSignatureInfo.SignatureLineId == xAttrList->getValueByName("loext:id");
97             });
98         if (pSignatureInfo != xSignatureInfo.end())
99         {
100             bIsSigned = true;
101             if (pSignatureInfo->SignatureIsValid)
102             {
103                 // Signature is valid, use the 'valid' image
104                 SAL_WARN_IF(!pSignatureInfo->ValidSignatureLineImage.is(), "xmloff",
105                             "No ValidSignatureLineImage!");
106                 xGraphic = pSignatureInfo->ValidSignatureLineImage;
107             }
108             else
109             {
110                 // Signature is invalid, use the 'invalid' image
111                 SAL_WARN_IF(!pSignatureInfo->InvalidSignatureLineImage.is(), "xmloff",
112                             "No InvalidSignatureLineImage!");
113                 xGraphic = pSignatureInfo->InvalidSignatureLineImage;
114             }
115 
116             xPropSet->setPropertyValue("Graphic", Any(xGraphic));
117         }
118         xPropSet->setPropertyValue("SignatureLineIsSigned", Any(bIsSigned));
119     }
120     catch (css::uno::Exception&)
121     {
122         // DocumentDigitalSignatures service not available.
123         // We render the "unsigned" shape instead.
124     }
125 }
126 
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128