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Diffstat (limited to 'tex/context/base/lpdf-xmp.lua')
| -rw-r--r-- | tex/context/base/lpdf-xmp.lua | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/tex/context/base/lpdf-xmp.lua b/tex/context/base/lpdf-xmp.lua new file mode 100644 index 000000000..c8e7b2b57 --- /dev/null +++ b/tex/context/base/lpdf-xmp.lua @@ -0,0 +1,165 @@ +if not modules then modules = { } end modules ['lpdf-xmp'] = { + version = 1.001, + comment = "companion to lpdf-ini.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files", + comment = "with help from Peter Rolf", +} + +local format, random, char, gsub, concat = string.format, math.random, string.char, string.gsub, table.concat +local xmlfillin = xml.fillin + +local trace_xmp = false trackers.register("backend.xmp", function(v) trace_xmp = v end) + +local pdfdictionary = lpdf.dictionary +local pdfconstant = lpdf.constant + +-- i wonder why this begin end is empty / w (no time now to look into it) + +local xpacket = [[ +<?xpacket begin="" id="%s"?> + +%s + +<?xpacket end="w"?>]] + +local mapping = { + -- user defined keys (pdfx:) + ["ConTeXt.Jobname"] = "rdf:Description/pdfx:ConTeXt.Jobname", + ["ConTeXt.Time"] = "rdf:Description/pdfx:ConTeXt.Time", + ["ConTeXt.Url"] = "rdf:Description/pdfx:ConTeXt.Url", + ["ConTeXt.Version"] = "rdf:Description/pdfx:ConTeXt.Version", + ["ID"] = "rdf:Description/pdfx:ID", + ["PTEX.Fullbanner"] = "rdf:Description/pdfx:PTEX.Fullbanner", + -- Adobe PDF schema + ["Keywords"] = "rdf:Description/pdf:Keywords", + ["Producer"] = "rdf:Description/pdf:Producer", + -- ["Trapped"] = "rdf:Description/pdf:Trapped", -- '/False' in /Info, but 'False' in XMP + -- Dublin Core schema + ["Author"] = "rdf:Description/dc:creator/rdf:Seq/rdf:li", + ["Format"] = "rdf:Description/dc:format", -- optional, but nice to have + ["Subject"] = "rdf:Description/dc:description", + ["Title"] = "rdf:Description/dc:title/rdf:Alt/rdf:li", + -- XMP Basic schema + ["CreateDate"] = "rdf:Description/xmp:CreateDate", + ["Creator"] = "rdf:Description/xmp:CreatorTool", + ["MetadataDate"] = "rdf:Description/xmp:MetadataDate", + ["ModifyDate"] = "rdf:Description/xmp:ModifyDate", + -- XMP Media Management schema + ["DocumentID"] = "rdf:Description/xmpMM:DocumentID", + ["InstanceID"] = "rdf:Description/xmpMM:InstanceID", + ["RenditionClass"] = "rdf:Description/xmpMM:RenditionClass", -- PDF/X-4 + ["VersionID"] = "rdf:Description/xmpMM:VersionID", -- PDF/X-4 + -- additional entries + -- PDF/X + ["GTS_PDFXVersion"] = "rdf:Description/pdfxid:GTS_PDFXVersion", + -- optional entries + -- all what is visible in the 'document properties --> additional metadata' window + -- XMP Rights Management schema (optional) + ["Marked"] = "rdf:Description/xmpRights:Marked", + -- ["Owner"] = "rdf:Description/xmpRights:Owner/rdf:Bag/rdf:li", -- maybe useful (not visible) + -- ["UsageTerms"] = "rdf:Description/xmpRights:UsageTerms", -- maybe useful (not visible) + ["WebStatement"] = "rdf:Description/xmpRights:WebStatement", + -- Photoshop PDF schema (optional) + ["AuthorsPosition"] = "rdf:Description/photoshop:AuthorsPosition", + ["Copyright"] = "rdf:Description/photoshop:Copyright", + ["CaptionWriter"] = "rdf:Description/photoshop:CaptionWriter", +} + +-- maybe some day we will load the xmp file at runtime + +local xmp, xmpfile, xmpname = nil, nil, "lpdf-xmp.xml" + +function lpdf.setxmpfile(name) + xmpfile = resolvers.findctxfile(name) or "" + if xmpfile == "" then + xmpfile = nil + end +end + +local function valid_xmp() + if not xmp then + local xmpfile = xmpfile or resolvers.find_file(xmpname) or "" + local xmpdata = (xmpfile ~= "" and io.loaddata(xmpfile)) or "" + xmp = xml.convert(xmpdata) + end + return xmp +end + +function lpdf.addxmpinfo(tag,value,check) + local pattern = mapping[tag] + if pattern then + xmlfillin(xmp or valid_xmp(),pattern,value,check) + end +end + +-- redefined + +local addtoinfo = lpdf.addtoinfo +local addxmpinfo = lpdf.addxmpinfo + +function lpdf.addtoinfo(tag,pdfvalue,strvalue) + addtoinfo(tag,pdfvalue) + addxmpinfo(tag,strvalue or gsub(tostring(pdfvalue),"^%((.*)%)$","%1")) -- hack +end + +-- for the do-it-yourselvers + +function lpdf.insertxmpinfo(pattern,whatever,prepend) + xml.insert(xmp or valid_xmp(),pattern,whatever,prepend) +end + +function lpdf.injectxmpinfo(pattern,whatever,prepend) + xml.inject(xmp or valid_xmp(),pattern,whatever,prepend) +end + +-- flushing + +local t = { } for i=1,24 do t[i] = random() end + +local function flushxmpinfo() + + commands.freezerandomseed(os.clock()) -- hack + + local t = { } for i=1,24 do t[i] = char(96 + random(26)) end + local packetid = concat(t) + local time = lpdf.timestamp() + addxmpinfo("Producer",format("LuaTeX-%0.2f.%s",tex.luatexversion/100,tex.luatexrevision)) + addxmpinfo("DocumentID",format("uuid:%s",os.uuid())) + addxmpinfo("InstanceID",format("uuid:%s",os.uuid())) + addxmpinfo("CreatorTool","LuaTeX + ConTeXt MkIV") + addxmpinfo("CreateDate",time) + addxmpinfo("ModifyDate",time) + addxmpinfo("MetadataDate",time) + addxmpinfo("PTEX.Fullbanner", tex.pdftexbanner) + local blob = xml.tostring(xml.first(xmp or valid_xmp(),"/x:xmpmeta")) + local md = pdfdictionary { + Subtype = pdfconstant("XML"), + Type = pdfconstant("Metadata"), + } + if trace_xmp then + commands.writestatus("system","xmp data flushed (see log file)") + texio.write_nl("log","") + texio.write("log","\n% ",(gsub(blob,"[\r\n]","\n%% ")),"\n") + end + blob = format(xpacket,packetid,blob) + if tex.pdfcompresslevel > 0 then + blob = gsub(blob,">%s+<","><") + end + local r = pdf.obj { + immediate = true, + compresslevel = 0, + type = "stream", + string = blob, + attr = md(), + } + lpdf.addtocatalog("Metadata",lpdf.reference(r)) + + commands.defrostrandomseed() -- hack + +end + +-- his will be enabled when we can inhibit compression for a stream at the lua end + +lpdf.registerdocumentfinalizer(flushxmpinfo,1) |