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Address discrepancies between PDF and XMP timestamps

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The PDF format and XMP metadata specs define different syntax for dates,
so account for these discrepancies by more carefully constructing the
final timestamps by post-processing strftime() output.
This commit is contained in:
Patrick McCarty 2023-05-29 17:23:24 -07:00
parent 1dd05cc36b
commit 5a414ce4e4
1 changed files with 16 additions and 2 deletions
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18
src/img2pdf.py
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@ -721,8 +721,16 @@ class pdfdoc(object):
if engine != Engine.pikepdf: if engine != Engine.pikepdf:
self.writer.docinfo = PdfDict(indirect=True) self.writer.docinfo = PdfDict(indirect=True)
timezone_regex = r'^([+-])([0-9]{2})([0-9]{2})([0-9.]+)?$'
def datetime_to_pdfdate(dt): def datetime_to_pdfdate(dt):
return dt.strftime("%Y%m%d%H%M%S%z") time_no_tz = dt.strftime("%Y%m%d%H%M%S")
# Format for `%z` specifier is [+-]HHMM(SS(\.ffffff)?)?, but the
# PDF format only accepts the [+-]HHMM part, and it must be
# formatted as [+-]HH'MM'.
tz = dt.strftime("%z")
tz_pdf = re.sub(timezone_regex, r"\1\2'\3'", tz)
return time_no_tz + tz_pdf
for k in ["Title", "Author", "Creator", "Producer", "Subject"]: for k in ["Title", "Author", "Creator", "Producer", "Subject"]:
v = locals()[k.lower()] v = locals()[k.lower()]
@ -752,7 +760,13 @@ class pdfdoc(object):
) )
def datetime_to_xmpdate(dt): def datetime_to_xmpdate(dt):
return dt.strftime("%Y-%m-%dT%H:%M:%S%z") time_no_tz = dt.strftime("%Y-%m-%dT%H:%M:%S")
# Format for `%z` specifier is [+-]HHMM(SS(\.ffffff)?)?, but the
# XMP metadata only accepts the [+-]HHMM part, and it must be
# formatted as [+-]HH:MM.
tz = dt.strftime("%z")
tz_xmp = re.sub(timezone_regex, r'\1\2:\3', tz)
return time_no_tz + tz_xmp
self.xmp = b"""<?xpacket begin='\xef\xbb\xbf' id='W5M0MpCehiHzreSzNTczkc9d'?> 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'> <x:xmpmeta xmlns:x='adobe:ns:meta/' x:xmptk='XMP toolkit 2.9.1-13, framework 1.6'>