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add --pdfa argument to attach an icc profile for PDF/A-1b compliant output

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Johannes 'josch' Schauer 4 years ago
parent bca3f802ac
commit 93f65a49c9
Signed by untrusted user: josch
GPG Key ID: F2CBA5C78FBD83E1
1 changed files with 101 additions and 11 deletions
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112
src/img2pdf.py
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@ -33,6 +33,7 @@ from io import BytesIO
import logging
import struct
import platform
import hashlib
have_pdfrw = True
try:
@ -502,7 +503,7 @@ class MyPdfWriter:
obj.identifier = newid
self.objects.append(obj)
def tostream(self, info, stream, version="1.3"):
def tostream(self, info, stream, version="1.3", ident=None):
xreftable = list()
# justification of the random binary garbage in the header from
@ -559,10 +560,11 @@ class MyPdfWriter:
for x in xreftable:
stream.write(x)
stream.write(b"trailer\n")
stream.write(
parse({b"/Size": len(xreftable), b"/Info": info, b"/Root": self.catalog})
+ b"\n"
)
trailer = {b"/Size": len(xreftable), b"/Info": info, b"/Root": self.catalog}
if ident is not None:
md5 = hashlib.md5(ident).hexdigest().encode("ascii")
trailer[b"/ID"] = b"[<%s><%s>]" % (md5, md5)
stream.write(parse(trailer) + b"\n")
stream.write(b"startxref\n")
stream.write(("%d\n" % xrefoffset).encode())
stream.write(b"%%EOF\n")
@ -619,6 +621,7 @@ class pdfdoc(object):
fit_window=False,
center_window=False,
fullscreen=False,
pdfa=None,
):
if engine is None:
if have_pikepdf:
@ -655,7 +658,7 @@ class pdfdoc(object):
continue
if engine != Engine.pikepdf:
v = PdfString.encode(v)
self.writer.docinfo[getattr(PdfName,k)] = v
self.writer.docinfo[getattr(PdfName, k)] = v
now = datetime.now()
for k in ["CreationDate", "ModDate"]:
@ -665,6 +668,8 @@ class pdfdoc(object):
if v is None:
v = now
v = ("D:" + datetime_to_pdfdate(v)).encode("ascii")
if engine == Engine.internal:
v = b"(" + v + b")"
self.writer.docinfo[getattr(PdfName, k)] = v
if keywords is not None:
if engine == Engine.pikepdf:
@ -674,6 +679,38 @@ class pdfdoc(object):
",".join(keywords)
)
def datetime_to_xmpdate(dt):
return dt.strftime("%Y-%m-%dT%H:%M:%SZ")
self.xmp = b"""<?xpacket begin='\xef\xbb\xbf' id='W5M0MpCehiHzreSzNTczkc9d'?>
<x:xmpmeta xmlns:x='adobe:ns:meta/' x:xmptk='XMP toolkit 2.9.1-13, framework 1.6'>
<rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#' xmlns:iX='http://ns.adobe.com/iX/1.0/'>
<rdf:Description rdf:about='' xmlns:pdf='http://ns.adobe.com/pdf/1.3/'%s/>
<rdf:Description rdf:about='' xmlns:xmp='http://ns.adobe.com/xap/1.0/'>
%s
%s
</rdf:Description>
<rdf:Description rdf:about='' xmlns:pdfaid='http://www.aiim.org/pdfa/ns/id/' pdfaid:part='1' pdfaid:conformance='B'/>
</rdf:RDF>
</x:xmpmeta>
<?xpacket end='w'?>
""" % (
b" pdf:Producer='%s'" % producer.encode("ascii")
if producer is not None
else b"",
b""
if creationdate is None and nodate
else b"<xmp:ModifyDate>%s</xmp:ModifyDate>"
% datetime_to_xmpdate(now if creationdate is None else creationdate).encode(
"ascii"
),
b""
if moddate is None and nodate
else b"<xmp:CreateDate>%s</xmp:CreateDate>"
% datetime_to_xmpdate(now if moddate is None else moddate).encode("ascii"),
)
if engine != Engine.pikepdf:
# this is done because pdfrw adds info, catalog and pages as the first
# three objects in this order
@ -691,6 +728,7 @@ class pdfdoc(object):
self.fullscreen = fullscreen
self.engine = engine
self.output_version = version
self.pdfa = pdfa
def add_imagepage(
self,
@ -722,7 +760,6 @@ class pdfdoc(object):
elif self.engine == Engine.pdfrw:
from pdfrw import PdfDict, PdfName, PdfObject, PdfString
from pdfrw.py23_diffs import convert_load
elif self.engine == Engine.internal:
PdfDict = MyPdfDict
PdfName = MyPdfName
@ -906,12 +943,13 @@ class pdfdoc(object):
PdfName = pikepdf.Name
elif self.engine == Engine.pdfrw:
from pdfrw import PdfDict, PdfName, PdfArray, PdfObject
from pdfrw.py23_diffs import convert_load
elif self.engine == Engine.internal:
PdfDict = MyPdfDict
PdfName = MyPdfName
PdfObject = MyPdfObject
PdfArray = MyPdfArray
convert_load = my_convert_load
else:
raise ValueError("unknown engine: %s" % self.engine)
NullObject = None if self.engine == Engine.pikepdf else PdfObject("null")
@ -1040,17 +1078,57 @@ class pdfdoc(object):
else:
raise ValueError("unknown page layout: %s" % self.page_layout)
if self.pdfa is not None:
if self.engine == Engine.pikepdf:
metadata = self.writer.make_stream(self.xmp)
else:
metadata = PdfDict(stream=convert_load(self.xmp))
metadata[PdfName.Subtype] = PdfName.XML
metadata[PdfName.Type] = PdfName.Metadata
with open(self.pdfa, "rb") as f:
icc = f.read()
intents = PdfDict()
if self.engine == Engine.pikepdf:
iccstream = self.writer.make_stream(icc)
iccstream.stream_dict.N = 3
else:
iccstream = PdfDict(stream=convert_load(zlib.compress(icc)))
iccstream[PdfName.N] = 3
iccstream[PdfName.Filter] = PdfName.FlateDecode
intents[PdfName.S] = PdfName.GTS_PDFA1
intents[PdfName.Type] = PdfName.OutputIntent
intents[PdfName.OutputConditionIdentifier] = (
b"sRGB" if self.engine == Engine.pikepdf else b"(sRGB)"
)
intents[PdfName.DestOutputProfile] = iccstream
catalog[PdfName.OutputIntents] = PdfArray([intents])
catalog[PdfName.Metadata] = metadata
if self.engine == Engine.internal:
self.writer.addobj(metadata)
self.writer.addobj(iccstream)
# now write out the PDF
if self.engine == Engine.pikepdf:
self.writer.save(outputstream, min_version=self.output_version, linearize=True)
self.writer.save(
outputstream, min_version=self.output_version, linearize=True
)
elif self.engine == Engine.pdfrw:
self.writer.trailer.Info = self.writer.docinfo
# setting the version attribute of the pdfrw PdfWriter object will
# influence the behaviour of the write() function
self.writer.version = self.output_version
if self.pdfa:
md5 = hashlib.md5(b"").hexdigest().encode("ascii")
self.writer.trailer[PdfName.ID] = PdfArray([md5, md5])
self.writer.write(outputstream)
elif self.engine == Engine.internal:
self.writer.tostream(self.writer.docinfo, outputstream, self.output_version)
self.writer.tostream(
self.writer.docinfo,
outputstream,
self.output_version,
None if self.pdfa is None else b"",
)
else:
raise ValueError("unknown engine: %s" % self.engine)
@ -1847,6 +1925,7 @@ def convert(*images, **kwargs):
bleedborder=None,
trimborder=None,
artborder=None,
pdfa=None,
)
for kwname, default in _default_kwargs.items():
if kwname not in kwargs:
@ -1871,6 +1950,7 @@ def convert(*images, **kwargs):
kwargs["viewer_fit_window"],
kwargs["viewer_center_window"],
kwargs["viewer_fullscreen"],
kwargs["pdfa"],
)
# backwards compatibility with older img2pdf versions where the first
@ -3164,7 +3244,7 @@ RGB.""",
"The internal engine does not have additional requirements and writes "
"out a human readable PDF. The pikepdf engine requires the pikepdf "
"Python module and qpdf library, is most featureful, can "
"linearize PDFs (\"fast web view\") and can compress more parts of it."
'linearize PDFs ("fast web view") and can compress more parts of it.'
"The pdfrw engine requires the pdfrw Python "
"module but does not support unicode metadata (See "
"https://github.com/pmaupin/pdfrw/issues/39) or palette data (See "
@ -3191,6 +3271,15 @@ RGB.""",
% Image.MAX_IMAGE_PIXELS,
)
outargs.add_argument(
"--pdfa",
nargs="?",
const="/usr/share/color/icc/ghostscript/srgb.icc",
default=None,
help="Output a PDF/A-1b complient document. By default, this will "
"embed /usr/share/color/icc/ghostscript/srgb.icc as the color profile.",
)
sizeargs = parser.add_argument_group(
title="Image and page size and layout arguments",
description="""\
@ -3530,6 +3619,7 @@ and left/right, respectively. It is not possible to specify asymmetric borders.
bleedborder=args.bleed_border,
trimborder=args.trim_border,
artborder=args.art_border,
pdfa=args.pdfa,
)
except Exception as e:
logging.error("error: " + str(e))

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