sebastian/pdf-sign
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Dieser Commit ist enthalten in:
Axel Svensson 2021-10-11 22:56:08 +02:00
Ursprung 823ec4b9cb
Commit e8eab02591
1 geänderte Dateien mit 66 neuen und 29 gelöschten Zeilen
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pdf-sign
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@ -2,35 +2,49 @@
#Dependencies: python3, pdftk, gs, mv, pdfinfo #Dependencies: python3, pdftk, gs, mv, pdfinfo
import os, queue, re, subprocess, sys, tempfile, threading, time, tkinter as tk import argparse, os, queue, re, subprocess, sys, tempfile, threading, time, tkinter as tk
signatureDir=os.path.expanduser(os.environ['PDF_SIGNATURE_DIR'] if 'PDF_SIGNATURE_DIR' in os.environ else "~/.pdf_signatures") signatureDir=os.path.expanduser(os.environ['PDF_SIGNATURE_DIR'] if 'PDF_SIGNATURE_DIR' in os.environ else "~/.pdf_signatures")
# Inspired by https://unix.stackexchange.com/a/141496 # Inspired by https://unix.stackexchange.com/a/141496
def main(filePath, pagestr=None): def main(args):
#filePath=os.path.expanduser(filePath) filePath=args.input
with tempfile.TemporaryDirectory() as tempdir: with tempfile.TemporaryDirectory() as tempdir:
intmp=lambda fileName: os.path.join(tempdir, fileName) intmp=lambda fileName: os.path.join(tempdir, fileName)
# Flatten (make forms non-editable) before signing # Maybe flatten (make forms non-editable) before signing
flatPDF=Cell(lambda: subprocess.run(['pdftk', filePath, 'output', intmp('flat.pdf'), 'flatten'], check=True) and intmp('flat.pdf')) @Cell
def inputPDF():
if args.flatten:
outFile=intmp('input.pdf')
subprocess.run([
'pdftk', filePath,
'output', outFile,
'flatten'
], check=True)
return outFile
return filePath
# The chosen page # The chosen page
pageCount=pdfCountPages(flatPDF()) pageCount=pdfCountPages(inputPDF())
pageNumber=Cell(int(pagestr) if pagestr else pageCount) if args.page < -pageCount or args.page==0 or pageCount < args.page:
pagePDF=Cell(lambda: subprocess.run(['pdftk', flatPDF(), 'cat', str(pageNumber()), 'output', intmp('page.pdf')], check=True) and intmp('page.pdf')) die('Page number out of range')
pageNumber=Cell(args.page if 0 < args.page else pageCount+args.page+1)
pagePDF=Cell(lambda: subprocess.run(['pdftk', inputPDF(), 'cat', str(pageNumber()), 'output', intmp('page.pdf')], check=True) and intmp('page.pdf'))
pageSize=Cell(lambda: pdfGetSize(pagePDF())) pageSize=Cell(lambda: pdfGetSize(pagePDF()))
# The chosen signature # The chosen signature
signatures=[*filter(lambda x: m("^.*\.pdf$", x), os.listdir(signatureDir))] if not args.signature and args.batch:
die('In batch mode, signature must be specified.')
signatures=[*filter(lambda x: m("^.*\.pdf$", x), os.listdir(signatureDir))] if not args.signature else [None]
signatureIndex=Cell(0) signatureIndex=Cell(0)
signatureAbsPath=Cell(lambda: os.path.join(signatureDir, signatures[signatureIndex()])) signaturePath=Cell(lambda: args.signature if args.signature else os.path.join(signatureDir, signatures[signatureIndex()]))
signatureSize=Cell(lambda: pdfGetSize(signatureAbsPath())) signatureSize=Cell(lambda: pdfGetSize(signaturePath()))
signaturePositionX=Cell(0.5) signaturePositionX=Cell(args.x_coordinate)
signaturePositionY=Cell(0.75) signaturePositionY=Cell(args.y_coordinate)
signatureScale=Cell(0) signatureScale=Cell(0)
@Cell @Cell
def signaturePositionedPDF(): def signaturePositionedPDF():
(w, h)=pageSize() (w, h)=pageSize()
(sw, sh)=signatureSize() (sw, sh)=signatureSize()
resize=1.1**signatureScale()*min(w/sw, h/sh)/3 resize=1.1**signatureScale()*min(args.width*w/sw, args.height*h/sh)
dx=w*signaturePositionX()/resize - sw/2 dx=w*signaturePositionX()/resize - sw/2
dy=h*(1-signaturePositionY())/resize - sh/2 dy=h*(1-signaturePositionY())/resize - sh/2
outFile=intmp('signature-positioned.pdf') outFile=intmp('signature-positioned.pdf')
@ -40,7 +54,7 @@ def main(filePath, pagestr=None):
'-sDEVICE=pdfwrite', '-sDEVICE=pdfwrite',
f'-dDEVICEWIDTHPOINTS={w}', f'-dDEVICEHEIGHTPOINTS={h}', '-dFIXEDMEDIA', f'-dDEVICEWIDTHPOINTS={w}', f'-dDEVICEHEIGHTPOINTS={h}', '-dFIXEDMEDIA',
'-c', f'<</BeginPage{{{resize} {resize} scale {dx} {dy} translate}}>> setpagedevice', '-c', f'<</BeginPage{{{resize} {resize} scale {dx} {dy} translate}}>> setpagedevice',
'-f', signatureAbsPath(), '-f', signaturePath(),
], check=True) ], check=True)
return outFile return outFile
# The signed page # The signed page
@ -73,7 +87,7 @@ def main(filePath, pagestr=None):
return outFile return outFile
# GUI # GUI
doSign=True doSign=True
gui=True gui=not args.batch
if gui: if gui:
doSign=False doSign=False
# Commands # Commands
@ -126,9 +140,10 @@ def main(filePath, pagestr=None):
pagemenu.add_command(label='Last page', underline=0, accelerator='End', command=cmd_lastPage) pagemenu.add_command(label='Last page', underline=0, accelerator='End', command=cmd_lastPage)
placemenu = tk.Menu(rootmenu, tearoff=0) placemenu = tk.Menu(rootmenu, tearoff=0)
rootmenu.add_cascade(label="Signature", underline=1, menu=placemenu) rootmenu.add_cascade(label="Signature", underline=1, menu=placemenu)
placemenu.add_command(label='Previous signature', underline=0, accelerator='Ctrl-Left', command=cmd_prevSignature) if not args.signature:
placemenu.add_command(label='Next signature', underline=0, accelerator='Ctrl-Right', command=cmd_nextSignature) placemenu.add_command(label='Previous signature', underline=0, accelerator='Ctrl-Left', command=cmd_prevSignature)
placemenu.add_separator() placemenu.add_command(label='Next signature', underline=0, accelerator='Ctrl-Right', command=cmd_nextSignature)
placemenu.add_separator()
placemenu.add_command(label='Enlarge signature', underline=0, accelerator='+', command=cmd_enlargeSignature) placemenu.add_command(label='Enlarge signature', underline=0, accelerator='+', command=cmd_enlargeSignature)
placemenu.add_command(label='Shrink signature', underline=0, accelerator='-', command=cmd_shrinkSignature) placemenu.add_command(label='Shrink signature', underline=0, accelerator='-', command=cmd_shrinkSignature)
placemenu.add_separator() placemenu.add_separator()
@ -208,19 +223,24 @@ def main(filePath, pagestr=None):
# End of GUI # End of GUI
if doSign: if doSign:
[ignored, pathPart1, pathPart2] = m("^(.*)(\.[Pp][Dd][Ff])$", filePath) [ignored, pathPart1, pathPart2] = m("^(.*)(\.[Pp][Dd][Ff])$", filePath)
signedFilePath=f'{pathPart1}.signed{pathPart2}' signedFilePath=args.output if args.output else f'{pathPart1}.signed{pathPart2}'
if os.path.exists(signedFilePath): if os.path.exists(signedFilePath):
backupFilePath=f'{pathPart1}.signed.backup{time.strftime("%Y%m%d_%H%M%S")}{pathPart2}' if args.existing=='backup':
subprocess.run([ backupFilePath=f'{signedFilePath}.backup{time.strftime("%Y%m%d_%H%M%S")}'
'mv', subprocess.run([
signedFilePath, 'mv',
backupFilePath, signedFilePath,
], check=True) backupFilePath,
print(f'Renamed {signedFilePath} to {backupFilePath}') ], check=True)
print(f'Renamed {signedFilePath} to {backupFilePath}')
elif args.existing=='fail':
die(f'Output file {signedFilePath} already exists')
else:
assert args.existing=='overwrite'
pnr=pageNumber() pnr=pageNumber()
subprocess.run([ subprocess.run([
'pdftk', 'pdftk',
f'A={flatPDF()}', f'A={inputPDF()}',
f'B={signedPagePDF()}', f'B={signedPagePDF()}',
'cat', 'cat',
*([f'A1-{pnr-1}'] if 1 < pnr else []), *([f'A1-{pnr-1}'] if 1 < pnr else []),
@ -310,4 +330,21 @@ class NonBlockingIterable:
except queue.Empty: except queue.Empty:
yield None yield None
main(*sys.argv[1:]) def die(reason):
print(reason, file=sys.stderr)
sys.exit(2)
parser = argparse.ArgumentParser(description='Sign a PDF file.')
parser.add_argument('input', metavar='input.pdf', type=str, help='Input PDF file.')
parser.add_argument('-p', '--page', type=int, default=-1, help='The page to sign, negative for counting from the end. (default: -1)')
parser.add_argument('-s', '--signature', type=str, help='Path to file used as signature. Required in batch mode. In GUI mode, the user can choose among files in $PDF_SIGNATURE_DIR or ~/.pdf_signatures.')
parser.add_argument('-x', '--x-coordinate', type=float, default=0.5, help='Horizontal coordinate of signature center, in page width units. (default: 0.5)')
parser.add_argument('-y', '--y-coordinate', type=float, default=0.75, help='Vertical coordinate of signature center, in page height units. (default: 0.75)')
parser.add_argument('-W', '--width', type=float, default=0.28, help='Width of box to fit signature to, in page width units. (default: 0.28)')
parser.add_argument('-H', '--height', type=float, default=0.28, help='Height of box to fit signature to, in page height units. (default: 0.28)')
parser.add_argument('-o', '--output', type=str, help='Output file. (default: Add ".signed" before the extension)')
parser.add_argument('-b', '--batch', action=argparse.BooleanOptionalAction, default=False, help='Batch mode: do not show GUI.')
parser.add_argument('-f', '--flatten', action=argparse.BooleanOptionalAction, default=True, help='Flatten before signing.')
parser.add_argument('-e', '--existing', type=str, choices=['backup', 'overwrite', 'fail'], default='backup', help='What to do if output file exists. (default: backup)')
main(parser.parse_args(sys.argv[1:] or ['-h']))