126 lines
4.2 KiB
Python
126 lines
4.2 KiB
Python
##
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## @copyright Copyright (C) 2020, struktur AG
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##
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## @author Joachim Bauch <mail@joachim-bauch.de>
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##
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## @license AGPL-3.0
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##
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## This program is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Affero General Public License as
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## published by the Free Software Foundation, either version 3 of the
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## License, or (at your option) any later version.
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##
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU Affero General Public License for more details.
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##
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## You should have received a copy of the GNU Affero General Public License
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## along with this program. If not, see <https://www.gnu.org/licenses/>.
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##
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from __future__ import print_function
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from io import BytesIO
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import sys
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import time
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try:
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basestring
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except NameError:
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# Python 3
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basestring = str
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try:
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from PyPDF2.generic import ArrayObject, BooleanObject, DictionaryObject, FloatObject, NameObject, RectangleObject, TextStringObject
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from PyPDF2.pdf import PdfFileReader, PdfFileWriter
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except ImportError:
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# Development
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sys.path.append('PyPDF2')
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try:
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from PyPDF2.generic import ArrayObject, BooleanObject, DictionaryObject, FloatObject, NameObject, RectangleObject, TextStringObject
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from PyPDF2.pdf import PdfFileReader, PdfFileWriter
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except ImportError:
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# Fallback to package "python-pypdf" in the system.
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from pyPdf.generic import ArrayObject, BooleanObject, DictionaryObject, FloatObject, NameObject, RectangleObject, TextStringObject
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from pyPdf.pdf import PdfFileReader, PdfFileWriter
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BYTE_TO_COLOR = 1.0 / 255.0
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def annotate(fp_in, annotations):
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reader = PdfFileReader(fp_in)
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pdf = PdfFileWriter()
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for page in reader.pages:
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pdf.addPage(page)
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for annotation in annotations:
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page = annotation.get('page', 0)
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try:
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pdfpage = pdf.getPage(page)
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except IndexError:
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print('Page %d not found in pdf, not adding annotation %r' % (page, annotation), file=sys.stderr)
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continue
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size = pdfpage.mediaBox
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angle = int(pdfpage.get('/Rotate', 0))
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x = annotation['x']
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y = annotation['y']
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if angle == 0:
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x = float(x)
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y = float(size[3]) - float(y) - 20
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elif angle == 90:
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x, y = float(y) - 2, float(x) - 15
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else:
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x = float(x)
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y = float(y)
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print('Page rotated by %d degrees not implemented yet' % (angle), file=sys.stderr)
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color = annotation.get('color', None)
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if isinstance(color, basestring):
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if color[:1] != '#':
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print('Unsupported color format: %s' % (color), file=sys.stderr)
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color = None
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else:
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# Assume HTML color with format "#RRGGBB".
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try:
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color = int(color[1:], 16)
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except ValueError as e:
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print('Unsupported color format: %s (%s)' % (color, e), file=sys.stderr)
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color = None
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if color is not None:
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r, g, b = color >> 16, (color >> 8) & 0xff, color & 0xff
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color = (r * BYTE_TO_COLOR, g * BYTE_TO_COLOR, b * BYTE_TO_COLOR)
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else:
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color = None
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pages = pdf.getObject(pdf._pages)
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pageref = pages["/Kids"][page]
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anno = DictionaryObject()
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anno.update({
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NameObject('/Type'): NameObject('/Annot'),
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NameObject('/Subtype'): NameObject('/Text'),
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NameObject('/P'): pageref,
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NameObject('/Rect'): RectangleObject([x, y, x+18, y+20]),
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NameObject('/Contents'): TextStringObject(annotation['text']),
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NameObject('/C'): ArrayObject([FloatObject(x) for x in color]),
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NameObject('/Open'): BooleanObject(True),
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})
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author = annotation.get('author', None)
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if author:
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anno[NameObject('/T')] = TextStringObject(author)
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modified = annotation.get('modified', None)
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if modified:
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modified = time.strftime('%Y%m%d%H%M%SZ', time.gmtime(modified))
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anno[NameObject('/M')] = TextStringObject(modified)
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annoRef = pdf._addObject(anno)
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annots = pdfpage.get('/Annots', None)
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if annots is None:
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annots = pdfpage[NameObject('/Annots')] = ArrayObject([annoRef])
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else:
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annots.append(annoRef)
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fp_out = BytesIO()
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pdf.write(fp_out)
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return fp_out.getvalue()
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