sk_sp<SkPDFObject> SkPDFMetadata::MakeDocumentInformationDict(
const SkDocument::PDFMetadata& metadata) {
auto dict = sk_make_sp<SkPDFDict>();
for (const auto keyValuePtr : gMetadataKeys) {
const SkString& value = metadata.*(keyValuePtr.valuePtr);
if (value.size() > 0) {
dict->insertString(keyValuePtr.key, value);
}
}
dict->insertString("Producer", "Skia/PDF m" SKPDF_STRING(SK_MILESTONE));
if (metadata.fCreation.fEnabled) {
dict->insertString("CreationDate",
pdf_date(metadata.fCreation.fDateTime));
}
if (metadata.fModified.fEnabled) {
dict->insertString("ModDate", pdf_date(metadata.fModified.fDateTime));
}
return dict;
}
SkPDFObject* SkPDFMetadata::createDocumentInformationDict() const {
auto dict = sk_make_sp<SkPDFDict>();
static const char* keys[] = {
"Title", "Author", "Subject", "Keywords", "Creator"};
for (const char* key : keys) {
for (const SkDocument::Attribute& keyValue : fInfo) {
if (keyValue.fKey.equals(key)) {
dict->insertString(key, keyValue.fValue);
}
}
}
dict->insertString("Producer", "Skia/PDF m" SKPDF_STRING(SK_MILESTONE));
if (fCreation) {
dict->insertString("CreationDate", pdf_date(*fCreation.get()));
}
if (fModified) {
dict->insertString("ModDate", pdf_date(*fModified.get()));
}
return dict.release();
}
sk_sp<SkPDFObject> SkPDFMetadata::MakeXMPObject(
const SkDocument::PDFMetadata& metadata,
const UUID& doc,
const UUID& instance) {
static const char templateString[] =
"<?xpacket begin=\"\" id=\"W5M0MpCehiHzreSzNTczkc9d\"?>\n"
"<x:xmpmeta xmlns:x=\"adobe:ns:meta/\"\n"
" x:xmptk=\"Adobe XMP Core 5.4-c005 78.147326, "
"2012/08/23-13:03:03\">\n"
"<rdf:RDF "
"xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\">\n"
"<rdf:Description rdf:about=\"\"\n"
" xmlns:xmp=\"http://ns.adobe.com/xap/1.0/\"\n"
" xmlns:dc=\"http://purl.org/dc/elements/1.1/\"\n"
" xmlns:xmpMM=\"http://ns.adobe.com/xap/1.0/mm/\"\n"
" xmlns:pdf=\"http://ns.adobe.com/pdf/1.3/\"\n"
" xmlns:pdfaid=\"http://www.aiim.org/pdfa/ns/id/\">\n"
"<pdfaid:part>2</pdfaid:part>\n"
"<pdfaid:conformance>B</pdfaid:conformance>\n"
"%s" // ModifyDate
"%s" // CreateDate
"%s" // xmp:CreatorTool
"<dc:format>application/pdf</dc:format>\n"
"%s" // dc:title
"%s" // dc:description
"%s" // author
"%s" // keywords
"<xmpMM:DocumentID>uuid:%s</xmpMM:DocumentID>\n"
"<xmpMM:InstanceID>uuid:%s</xmpMM:InstanceID>\n"
"<pdf:Producer>Skia/PDF m" SKPDF_STRING(SK_MILESTONE) "</pdf:Producer>\n"
"%s" // pdf:Keywords
"</rdf:Description>\n"
"</rdf:RDF>\n"
"</x:xmpmeta>\n" // Note: the standard suggests 4k of padding.
"<?xpacket end=\"w\"?>\n";
SkString creationDate;
SkString modificationDate;
if (metadata.fCreation.fEnabled) {
SkString tmp;
metadata.fCreation.fDateTime.toISO8601(&tmp);
SkASSERT(0 == count_xml_escape_size(tmp));
// YYYY-mm-ddTHH:MM:SS[+|-]ZZ:ZZ; no need to escape
creationDate = SkStringPrintf("<xmp:CreateDate>%s</xmp:CreateDate>\n",
tmp.c_str());
}
if (metadata.fModified.fEnabled) {
SkString tmp;
metadata.fModified.fDateTime.toISO8601(&tmp);
SkASSERT(0 == count_xml_escape_size(tmp));
modificationDate = SkStringPrintf(
"<xmp:ModifyDate>%s</xmp:ModifyDate>\n", tmp.c_str());
}
SkString title =
escape_xml(metadata.fTitle,
"<dc:title><rdf:Alt><rdf:li xml:lang=\"x-default\">",
"</rdf:li></rdf:Alt></dc:title>\n");
SkString author =
escape_xml(metadata.fAuthor, "<dc:creator><rdf:Bag><rdf:li>",
"</rdf:li></rdf:Bag></dc:creator>\n");
// TODO: in theory, XMP can support multiple authors. Split on a delimiter?
SkString subject = escape_xml(
metadata.fSubject,
"<dc:description><rdf:Alt><rdf:li xml:lang=\"x-default\">",
"</rdf:li></rdf:Alt></dc:description>\n");
SkString keywords1 =
escape_xml(metadata.fKeywords, "<dc:subject><rdf:Bag><rdf:li>",
"</rdf:li></rdf:Bag></dc:subject>\n");
SkString keywords2 = escape_xml(metadata.fKeywords, "<pdf:Keywords>",
"</pdf:Keywords>\n");
// TODO: in theory, keywords can be a list too.
SkString creator = escape_xml(metadata.fCreator, "<xmp:CreatorTool>",
"</xmp:CreatorTool>\n");
SkString documentID = uuid_to_string(doc); // no need to escape
SkASSERT(0 == count_xml_escape_size(documentID));
SkString instanceID = uuid_to_string(instance);
SkASSERT(0 == count_xml_escape_size(instanceID));
return sk_make_sp<PDFXMLObject>(SkStringPrintf(
templateString, modificationDate.c_str(), creationDate.c_str(),
creator.c_str(), title.c_str(), subject.c_str(), author.c_str(),
keywords1.c_str(), documentID.c_str(), instanceID.c_str(),
keywords2.c_str()));
}
