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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 trace_info = false trackers.register("backend.info", function(v) trace_info = v end)
local report_xmp = logs.reporter("backend","xmp")
local report_info = logs.reporter("backend","info")
local backends, lpdf = backends, lpdf
local codeinjections = backends.pdf.codeinjections -- normally it is registered
local pdfdictionary = lpdf.dictionary
local pdfconstant = lpdf.constant
local pdfreference = lpdf.reference
local pdfflushstreamobject = lpdf.flushstreamobject
-- 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-pdx.xml"
local function setxmpfile(name)
if xmp then
report_xmp("discarding loaded file %a",xmpfile)
xmp = nil
end
xmpfile = name ~= "" and name
end
codeinjections.setxmpfile = setxmpfile
commands.setxmpfile = setxmpfile
local function valid_xmp()
if not xmp then
-- local xmpfile = xmpfile or resolvers.findfile(xmpname) or ""
if xmpfile and xmpfile ~= "" then
xmpfile = resolvers.findfile(xmpfile) or ""
end
if not xmpfile or xmpfile == "" then
xmpfile = resolvers.findfile(xmpname) or ""
end
if xmpfile ~= "" then
report_xmp("using file %a",xmpfile)
end
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)
local value = strvalue or gsub(tostring(pdfvalue),"^%((.*)%)$","%1") -- hack
if trace_info then
report_info("set %a to %a",tag,value)
end
addxmpinfo(tag,value)
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 documentid = format("uuid:%s",os.uuid())
local instanceid = format("uuid:%s",os.uuid())
local producer = format("LuaTeX-%0.2f.%s",tex.luatexversion/100,tex.luatexrevision)
local creator = "LuaTeX + ConTeXt MkIV"
local time = lpdf.timestamp()
local fullbanner = tex.pdftexbanner
-- local fullbanner = gsub(tex.pdftexbanner,"kpse.*","")
addxmpinfo("DocumentID", documentid)
addxmpinfo("InstanceID", instanceid)
addxmpinfo("Producer", producer)
addxmpinfo("CreatorTool", creator)
addxmpinfo("CreateDate", time)
addxmpinfo("ModifyDate", time)
addxmpinfo("MetadataDate", time)
addxmpinfo("PTEX.Fullbanner", fullbanner)
addtoinfo("Producer", producer)
addtoinfo("Creator", creator)
addtoinfo("CreationDate", time)
addtoinfo("ModDate", time)
-- addtoinfo("PTEX.Fullbanner", fullbanner) -- no checking done on existence
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
report_xmp("data flushed, see log file")
logs.pushtarget("logfile")
report_xmp("start xmp blob")
logs.newline()
logs.writer(blob)
logs.newline()
report_xmp("stop xmp blob")
logs.poptarget()
end
blob = format(xpacket,packetid,blob)
if not verbose and tex.pdfcompresslevel > 0 then
blob = gsub(blob,">%s+<","><")
end
local r = pdfflushstreamobject(blob,md,false) -- uncompressed
lpdf.addtocatalog("Metadata",pdfreference(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,"metadata")
directives.register("backend.verbosexmp", function(v)
verbose = v
end)
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