mirror of
https://gitlab.com/flectra-community/reporting-engine.git
synced 2024-11-22 14:12:06 +00:00
111 lines
3.9 KiB
Python
111 lines
3.9 KiB
Python
# © 2016 Therp BV <http://therp.nl>
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# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
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from base64 import b64decode
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from logging import getLogger
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from PIL import Image
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from io import BytesIO
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try:
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# we need this to be sure PIL has loaded PDF support
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from PIL import PdfImagePlugin # noqa: F401
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except ImportError:
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pass
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from flectra import api, models, fields, tools
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logger = getLogger(__name__)
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try:
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from PyPDF2 import PdfFileWriter, PdfFileReader # pylint: disable=W0404
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from PyPDF2.utils import PdfReadError # pylint: disable=W0404
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except ImportError:
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logger.debug('Can not import PyPDF2')
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class Report(models.Model):
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_inherit = 'ir.actions.report'
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pdf_watermark = fields.Binary('Watermark')
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pdf_watermark_expression = fields.Char(
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'Watermark expression', help='An expression yielding the base64 '
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'encoded data to be used as watermark. \n'
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'You have access to variables `env` and `docs`')
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@api.multi
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def render_qweb_pdf(self, res_ids=None, data=None):
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if not self.env.context.get('res_ids'):
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return super(
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Report, self.with_context(res_ids=res_ids)
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).render_qweb_pdf(res_ids=res_ids, data=data)
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return super(Report, self).render_qweb_pdf(res_ids=res_ids, data=data)
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@api.model
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def _run_wkhtmltopdf(self, bodies, header=None, footer=None,
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landscape=False, specific_paperformat_args=None,
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set_viewport_size=False):
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result = super(Report, self)._run_wkhtmltopdf(
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bodies, header=header, footer=footer, landscape=landscape,
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specific_paperformat_args=specific_paperformat_args,
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set_viewport_size=set_viewport_size)
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docids = self.env.context.get('res_ids', False)
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watermark = None
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if self.pdf_watermark:
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watermark = b64decode(self.pdf_watermark)
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elif docids:
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watermark = tools.safe_eval(
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self.pdf_watermark_expression or 'None',
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dict(env=self.env, docs=self.env[self.model].browse(docids)),
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)
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if watermark:
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watermark = b64decode(watermark)
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if not watermark:
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return result
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pdf = PdfFileWriter()
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pdf_watermark = None
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try:
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pdf_watermark = PdfFileReader(BytesIO(watermark))
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except PdfReadError:
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# let's see if we can convert this with pillow
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try:
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Image.init()
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image = Image.open(BytesIO(watermark))
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pdf_buffer = BytesIO()
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if image.mode != 'RGB':
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image = image.convert('RGB')
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resolution = image.info.get(
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'dpi', self.paperformat_id.dpi or 90
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)
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if isinstance(resolution, tuple):
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resolution = resolution[0]
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image.save(pdf_buffer, 'pdf', resolution=resolution)
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pdf_watermark = PdfFileReader(pdf_buffer)
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except:
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logger.exception('Failed to load watermark')
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if not pdf_watermark:
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logger.error(
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'No usable watermark found, got %s...', watermark[:100]
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)
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return result
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if pdf_watermark.numPages < 1:
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logger.error('Your watermark pdf does not contain any pages')
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return result
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if pdf_watermark.numPages > 1:
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logger.debug('Your watermark pdf contains more than one page, '
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'all but the first one will be ignored')
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for page in PdfFileReader(BytesIO(result)).pages:
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watermark_page = pdf.addBlankPage(
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page.mediaBox.getWidth(), page.mediaBox.getHeight()
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)
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watermark_page.mergePage(pdf_watermark.getPage(0))
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watermark_page.mergePage(page)
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pdf_content = BytesIO()
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pdf.write(pdf_content)
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return pdf_content.getvalue()
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