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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, gsub, match = string.format, string.gsub, string.match
local concat = table.concat
local settings_to_array = utilities.parsers.settings_to_array
local utfchar = utf.char
local xmlfillin = xml.fillin
local md5HEX = md5.HEX
local osdate, ostime, ostimezone, osuuid = os.date, os.time, os.timezone, os.uuid
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 = backends
local pdfbackend = backends.registered.pdf
local codeinjections = pdfbackend.codeinjections
local lpdf = lpdf
local pdfdictionary = lpdf.dictionary
local pdfconstant = lpdf.constant
local pdfunicode = lpdf.unicode
local pdfstring = lpdf.string
local pdfreference = lpdf.reference
local pdfflushstreamobject = lpdf.flushstreamobject
-- The XMP packet wrapper is kind of fixed, see page 10 of XMPSpecificationsPart1.pdf from
-- XMP-Toolkit-SDK-CC201607.zip. So we hardcode the id.
local xpacket = format ( [[
<?xpacket begin="%s" id="W5M0MpCehiHzreSzNTczkc9d"?>
%%s
<?xpacket end="w"?>]], utfchar(0xFEFF) )
local unknown = { false, false }
local mapping = table.setmetatableindex ( {
-- 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.Support"] = { "context", "rdf:Description/pdfx:ConTeXt.Support" },
["ConTeXt.Version"] = { "context", "rdf:Description/pdfx:ConTeXt.Version" },
["ConTeXt.LMTX"] = { "context", "rdf:Description/pdfx:ConTeXt.LMTX" },
["TeX.Support"] = { "metadata","rdf:Description/pdfx:TeX.Support" },
["LuaTeX.Version"] = { "metadata","rdf:Description/pdfx:LuaTeX.Version" },
["LuaTeX.Functionality"] = { "metadata","rdf:Description/pdfx:LuaTeX.Functionality" },
["LuaTeX.LuaVersion"] = { "metadata","rdf:Description/pdfx:LuaTeX.LuaVersion" },
["LuaTeX.Platform"] = { "metadata","rdf:Description/pdfx:LuaTeX.Platform" },
["ID"] = { "id", "rdf:Description/pdfx:ID" }, -- has date
-- 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" },
}, function() return unknown end )
local metadata = nil
local trailerid = true
local creationdate = false
local modificationdate = false
local function pdftimestamp(str)
local t = type(str)
if t == "string" then
local Y, M, D, h, m, s, Zs, Zh, Zm = match(str,"^(%d%d%d%d)%-(%d%d)%-(%d%d)T(%d%d):(%d%d):(%d%d)([%+%-])(%d%d):(%d%d)$")
return Y and format("D:%s%s%s%s%s%s%s%s'%s'",Y,M,D,h,m,s,Zs,Zh,Zm)
else
return osdate("D:%Y%m%d%H%M%S",t == "number" and str or ostime()) -- maybe "!D..." : universal time
end
end
local function pdfgetmetadata()
if not metadata then
local contextversion = environment.version
local luatexversion = format("%1.2f",LUATEXVERSION)
local luatexfunctionality = tostring(LUATEXFUNCTIONALITY)
local jobname = environment.jobname or tex.jobname or "unknown"
local documentid = trailerid and ("uuid:" .. osuuid()) or "no unique document id here"
local instanceid = trailerid and ("uuid:" .. osuuid()) or "no unique instance id here"
metadata = creationdate and {
producer = format("LuaMetaTeX-%s",luatexversion),
creator = format("LuaMetaTeX %s %s + ConTeXt LMTX %s",luatexversion,luatexfunctionality,contextversion),
luatexversion = luatexversion,
contextversion = contextversion,
luatexfunctionality = luatexfunctionality,
luaversion = tostring(LUAVERSION),
platform = os.platform,
creationdate = creationdate,
modificationdate = modificationdate,
id = format("%s | %s",jobname,creationdate),
documentid = documentid,
instanceid = instanceid,
jobname = jobname,
} or {
producer = "LuaMetaTeX",
creator = "LuaMetaTeX + ConTeXt LMTX",
id = jobname,
documentid = documentid,
instanceid = instanceid,
jobname = jobname,
}
-- inspect(metadata)
end
return metadata
end
local function pdfsetmetadate(n,both)
if n then
n = converters.totime(n)
if n then
creationdate = osdate("%Y-%m-%dT%H:%M:%S",ostime(n)) .. ostimezone()
if both then
modificationdate = creationdate
end
end
end
return creationdate
end
lpdf.pdftimestamp = pdftimestamp
function lpdf.gettrailerid()
if trailerid == true then
return md5.HEX(osuuid())
elseif type(trailerid) == "string" then
return md5.HEX(trailerid)
else
return false
end
end
-- string: use that, true: uuid, false: nothing
directives.register("backend.trailerid", function(v)
trailerid = type(v) and v or toboolean(v)
end)
-- year-mm-dd : use that for creation and modification
local function setdates(v)
local t = type(v)
if t == "number" or t == "string" then
local d = converters.totime(v)
if d then
report_info("forced date/time information %a will be used",pdfsetmetadate(d,true))
return
end
end
if toboolean(v) then
creationdate = osdate("%Y-%m-%dT%H:%M:%S") .. ostimezone()
modificationdate = creationdate
else
creationdate = false
modificationdate = false
end
end
setdates(true)
directives.register("backend.date", setdates)
-- 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 = mapping[tag][2]
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 = mapping[tag][2]
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 add_xmp_blob = true
local indentity_done = false -- using "setupidentity = function() end" fails as the meaning is frozen in register
local function setupidentity()
if not done then
--
local identity = interactions.general.getidentity()
local title = identity.title
local subtitle = identity.subtitle
local author = identity.author
local date = identity.date
local keywords = identity.keywords
--
if date and date ~= "" then
pdfsetmetadate(date)
end
if keywords then
keywords = concat(settings_to_array(keywords), " ")
end
--
local metadata = pdfgetmetadata()
local creator = metadata.creator
local contextversion = metadata.contextversion
local id = metadata.id
local jobname = metadata.jobname
local creator = metadata.creator
local creation = metadata.creationdate
local modification = metadata.modificationdate
--
if creator then
pdfaddtoinfo("Creator",pdfunicode(creator),creator)
end
if creation then
pdfaddtoinfo("CreationDate",pdfstring(pdftimestamp(creation)),creation)
end
if modification then
pdfaddtoinfo("ModDate",pdfstring(pdftimestamp(modification)),modification)
end
if id then
pdfaddtoinfo("ID",pdfstring(id),id) -- needed for pdf/x
end
--
if title ~= "" then
pdfaddtoinfo("Title",pdfunicode(title),title)
end
if subtitle ~= "" then
pdfaddtoinfo("Subject",pdfunicode(subtitle),subtitle)
end
if author ~= "" then
pdfaddtoinfo("Author",pdfunicode(author),author) -- '/Author' in /Info, 'Creator' in XMP
end
if keywords and keywords ~= "" then
pdfaddtoinfo("Keywords",pdfunicode(keywords),keywords)
end
--
if contextversion then
pdfaddtoinfo("ConTeXt.Version",contextversion)
end
if creation then
pdfaddtoinfo("ConTeXt.Time",creation)
end
if jobname then
pdfaddtoinfo("ConTeXt.Jobname",jobname)
end
--
pdfaddtoinfo("ConTeXt.Url","www.pragma-ade.com")
pdfaddtoinfo("ConTeXt.Support","contextgarden.net")
pdfaddtoinfo("TeX.Support","tug.org")
--
done = true
else
-- no need for a message
end
end
local function flushxmpinfo()
commands.pushrandomseed()
commands.setrandomseed(ostime())
local metadata = pdfgetmetadata()
local time = metadata.time
local producer = metadata.producer
local creator = metadata.creator
local documentid = metadata.documentid
local instanceid = metadata.instanceid
pdfaddtoinfo("Producer",producer)
pdfaddtoinfo("Creator",creator)
pdfaddtoinfo("CreationDate",time)
pdfaddtoinfo("ModDate",time)
if add_xmp_blob then
pdfaddxmpinfo("DocumentID",documentid)
pdfaddxmpinfo("InstanceID",instanceid)
pdfaddxmpinfo("Producer",producer)
pdfaddxmpinfo("CreatorTool",creator)
pdfaddxmpinfo("CreateDate",time)
pdfaddxmpinfo("ModifyDate",time)
pdfaddxmpinfo("MetadataDate",time)
pdfaddxmpinfo("LuaTeX.Version",metadata.luatexversion)
pdfaddxmpinfo("LuaTeX.Functionality",metadata.luatexfunctionality)
pdfaddxmpinfo("LuaTeX.LuaVersion",metadata.luaversion)
pdfaddxmpinfo("LuaTeX.Platform",metadata.platform)
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,blob)
if not verbose and lpdf.compresslevel() > 0 then
blob = gsub(blob,">%s+<","><")
end
local r = pdfflushstreamobject(blob,md,false) -- uncompressed
lpdf.addtocatalog("Metadata",pdfreference(r))
end
commands.poprandomseed() -- hack
end
lpdf.registerpagefinalizer(setupidentity,"identity")
lpdf.registerdocumentfinalizer(flushxmpinfo,1,"metadata")
directives.register("backend.xmp", function(v) add_xmp_blob = v end)
directives.register("backend.verbosexmp", function(v) verbose = v end)
|