70 lines
2.0 KiB
Python
70 lines
2.0 KiB
Python
import io
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import logging
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import os
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from django.conf import settings
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from django.contrib.auth.models import AnonymousUser
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from django.test.client import RequestFactory
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from PyPDF2 import PdfFileReader, PdfFileWriter
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from wkhtmltopdf.views import PDFTemplateResponse
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logger = logging.getLogger("bornhack.%s" % __name__)
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def generate_pdf_letter(filename, template, formatdict):
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logger.debug(
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"Generating PDF with filename %s and template %s" % (filename, template)
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)
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# conjure up a fake request for PDFTemplateResponse
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request = RequestFactory().get("/")
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request.user = AnonymousUser()
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request.session = {}
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# produce text-only PDF from template
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pdfgenerator = PDFTemplateResponse(
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request=request,
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template=template,
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context=formatdict,
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cmd_options={"margin-top": 50, "margin-bottom": 50},
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)
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textonlypdf = io.BytesIO()
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textonlypdf.write(pdfgenerator.rendered_content)
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# create a blank pdf to work with
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finalpdf = PdfFileWriter()
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# open the text-only pdf
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pdfreader = PdfFileReader(textonlypdf)
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# get watermark from watermark file
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watermark = PdfFileReader(
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open(
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os.path.join(
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settings.STATICFILES_DIRS[0], "pdf", settings.PDF_LETTERHEAD_FILENAME
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),
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"rb",
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)
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)
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# add the watermark to all pages
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for pagenum in range(pdfreader.getNumPages()):
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page = pdfreader.getPage(pagenum)
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try:
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page.mergePage(watermark.getPage(0))
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except ValueError:
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# watermark pdf might be broken?
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return False
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# add page to output
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finalpdf.addPage(page)
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# save the generated pdf to the archive
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fullpath = os.path.join(settings.PDF_ARCHIVE_PATH, filename)
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with open(fullpath, "wb") as fh:
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finalpdf.write(fh)
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logger.info("Saved pdf to archive: %s" % fullpath)
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returnfile = io.BytesIO()
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finalpdf.write(returnfile)
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return returnfile
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