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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 tostring, type = tostring, type
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) / begin can also be "?"
local xpacket = [[
<?xpacket begin="" id="%s"?>
%s
<?xpacket end="w"?>]]
local mapping = {
-- user defined keys (pdfx:)
["ConTeXt.Jobname"] = { "context", "rdf:Description/pdfx:ConTeXt.Jobname" },
["ConTeXt.Time"] = { "date", "rdf:Description/pdfx:ConTeXt.Time" },
["ConTeXt.Url"] = { "context", "rdf:Description/pdfx:ConTeXt.Url" },
["ConTeXt.Version"] = { "context", "rdf:Description/pdfx:ConTeXt.Version" },
["ID"] = { "id", "rdf:Description/pdfx:ID" }, -- has date
["PTEX.Fullbanner"] = { "metadata","rdf:Description/pdfx:PTEX.Fullbanner" },
-- Adobe PDF schema
["Keywords"] = { "metadata","rdf:Description/pdf:Keywords" },
["Producer"] = { "metadata","rdf:Description/pdf:Producer" },
-- ["Trapped"] = { "pdf", "rdf:Description/pdf:Trapped" }, -- '/False' in /Info, but 'False' in XMP
-- Dublin Core schema
["Author"] = { "metadata","rdf:Description/dc:creator/rdf:Seq/rdf:li" },
["Format"] = { "metadata","rdf:Description/dc:format" }, -- optional, but nice to have
["Subject"] = { "metadata","rdf:Description/dc:description/rdf:Alt/rdf:li" },
["Title"] = { "metadata","rdf:Description/dc:title/rdf:Alt/rdf:li" },
-- XMP Basic schema
["CreateDate"] = { "date", "rdf:Description/xmp:CreateDate" },
["CreationDate"] = { "date", "rdf:Description/xmp:CreationDate" }, -- dummy
["Creator"] = { "metadata","rdf:Description/xmp:CreatorTool" },
["MetadataDate"] = { "date", "rdf:Description/xmp:MetadataDate" },
["ModDate"] = { "date", "rdf:Description/xmp:ModDate" }, -- dummy
["ModifyDate"] = { "date", "rdf:Description/xmp:ModifyDate" },
-- XMP Media Management schema
["DocumentID"] = { "id", "rdf:Description/xmpMM:DocumentID" }, -- uuid
["InstanceID"] = { "id", "rdf:Description/xmpMM:InstanceID" }, -- uuid
["RenditionClass"] = { "pdf", "rdf:Description/xmpMM:RenditionClass" }, -- PDF/X-4
["VersionID"] = { "pdf", "rdf:Description/xmpMM:VersionID" }, -- PDF/X-4
-- additional entries
-- PDF/X
["GTS_PDFXVersion"] = { "pdf", "rdf:Description/pdfxid:GTS_PDFXVersion" },
-- optional entries
-- all what is visible in the 'document properties --> additional metadata' window
-- XMP Rights Management schema (optional)
["Marked"] = { "pdf", "rdf:Description/xmpRights:Marked" },
-- ["Owner"] = { "metadata", "rdf:Description/xmpRights:Owner/rdf:Bag/rdf:li" }, -- maybe useful (not visible)
-- ["UsageTerms"] = { "metadata", "rdf:Description/xmpRights:UsageTerms" }, -- maybe useful (not visible)
["WebStatement"] = { "metadata", "rdf:Description/xmpRights:WebStatement" },
-- Photoshop PDF schema (optional)
["AuthorsPosition"] = { "metadata", "rdf:Description/photoshop:AuthorsPosition" },
["Copyright"] = { "metadata", "rdf:Description/photoshop:Copyright" },
["CaptionWriter"] = { "metadata", "rdf:Description/photoshop:CaptionWriter" },
}
pdf.setsuppressoptionalinfo(
0 --
+ 1 -- pdfnofullbanner
+ 2 -- pdfnofilename
+ 4 -- pdfnopagenumber
+ 8 -- pdfnoinfodict
+ 16 -- pdfnocreator
+ 32 -- pdfnocreationdate
+ 64 -- pdfnomoddate
+ 128 -- pdfnoproducer
+ 256 -- pdfnotrapped
-- + 512 -- pdfnoid
)
local included = table.setmetatableindex( {
context = true,
id = true,
metadata = true,
date = true,
id = true,
pdf = true,
}, function(t,k)
return true
end)
function lpdf.settrailerid(v)
if v then
local b = toboolean(v) or v == ""
if b then
v = "This file is processed by ConTeXt and LuaTeX."
else
v = tostring(v)
end
local h = md5.HEX(v)
if b then
report_info("using frozen trailer id")
else
report_info("using hashed trailer id %a (%a)",v,h)
end
pdf.settrailerid(format("[<%s> <%s>]",h,h))
end
end
function lpdf.setdates(v)
local t = type(v)
if t == "number" or t == "string" then
t = converters.totime(v)
if t then
included.date = true
included.id = "fake"
report_info("forced date/time information %a will be used",lpdf.settime(t))
lpdf.settrailerid(false)
return
end
end
v = toboolean(v)
included.date = v
if v then
included.id = true
else
report_info("no date/time but fake id information will be added")
lpdf.settrailerid(true)
included.id = "fake"
-- maybe: lpdf.settime(231631200) -- 1975-05-05 % first entry of knuth about tex mentioned in DT
end
end
function lpdf.id() -- overload of ini
local banner = tex.jobname
if included.date then
return format("%s.%s",banner,lpdf.timestamp())
else
return banner
end
end
directives.register("backend.trailerid", lpdf.settrailerid)
directives.register("backend.date", lpdf.setdates)
local function permitdetail(what)
local m = mapping[what]
if m then
return included[m[1]] and m[2]
else
return included[what] and true or false
end
end
lpdf.permitdetail = permitdetail
-- 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
interfaces.implement {
name = "setxmpfile",
arguments = "string",
actions = 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 = permitdetail(tag)
if type(pattern) == "string" then
xmlfillin(xmp or valid_xmp(),pattern,value,check)
end
end
-- redefined
local pdfaddtoinfo = lpdf.addtoinfo
local pdfaddxmpinfo = lpdf.addxmpinfo
function lpdf.addtoinfo(tag,pdfvalue,strvalue)
local pattern = permitdetail(tag)
if pattern then
pdfaddtoinfo(tag,pdfvalue)
end
if type(pattern) == "string" then
local value = strvalue or gsub(tostring(pdfvalue),"^%((.*)%)$","%1") -- hack
if trace_info then
report_info("set %a to %a",tag,value)
end
xmlfillin(xmp or valid_xmp(),pattern,value,check)
end
end
local pdfaddtoinfo = lpdf.addtoinfo -- used later
-- 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 function randomstring(n)
local t = { }
for i=1,n do
t[i] = char(96 + random(26))
end
return concat(t)
end
randomstring(26) -- kind of initializes and kicks off random
local function flushxmpinfo()
commands.pushrandomseed()
commands.setrandomseed(os.time())
local packetid = "no unique packet id here" -- 24 chars
local documentid = "no unique document id here"
local instanceid = "no unique instance id here"
local producer = format("LuaTeX-%0.2f.%s",status.luatex_version/100,status.luatex_revision)
local creator = "LuaTeX + ConTeXt MkIV"
local time = lpdf.timestamp()
local fullbanner = status.banner
if included.id ~= "fake" then
packetid = randomstring(24)
documentid = "uuid:%s" .. os.uuid()
instanceid = "uuid:%s" .. os.uuid()
end
pdfaddxmpinfo("DocumentID", documentid)
pdfaddxmpinfo("InstanceID", instanceid)
pdfaddxmpinfo("Producer", producer)
pdfaddxmpinfo("CreatorTool", creator)
pdfaddxmpinfo("CreateDate", time)
pdfaddxmpinfo("ModifyDate", time)
pdfaddxmpinfo("MetadataDate", time)
pdfaddxmpinfo("PTEX.Fullbanner", fullbanner)
pdfaddtoinfo("Producer", producer)
pdfaddtoinfo("Creator", creator)
pdfaddtoinfo("CreationDate", time)
pdfaddtoinfo("ModDate", time)
-- pdfaddtoinfo("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 pdf.getcompresslevel() > 0 then
blob = gsub(blob,">%s+<","><")
end
local r = pdfflushstreamobject(blob,md,false) -- uncompressed
lpdf.addtocatalog("Metadata",pdfreference(r))
commands.poprandomseed() -- 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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