bornhack-website/shop/pdf.py

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from wkhtmltopdf.views import PDFTemplateResponse
from PyPDF2 import PdfFileWriter, PdfFileReader
from django.test.client import RequestFactory
from django.conf import settings
import StringIO
def generate_pdf_letter(filename, template, formatdict):
### produce text-only PDF from template
pdfgenerator = PDFTemplateResponse(
request=RequestFactory().get('/'),
template=template,
context=formatdict,
cmd_options={
'margin-top': 40,
'margin-bottom': 50,
},
)
textonlypdf = StringIO.StringIO()
textonlypdf.write(pdfgenerator.rendered_content)
### create a blank pdf to work with
finalpdf = PdfFileWriter()
### open the text-only pdf
pdfreader = PdfFileReader(textonlypdf)
### get watermark from watermark file
watermark = PdfFileReader(open(settings.LETTERHEAD_PDF_PATH, 'rb'))
### add the watermark to all pages
for pagenum in xrange(pdfreader.getNumPages()):
page = pdfreader.getPage(pagenum)
try:
page.mergePage(watermark.getPage(0))
except ValueError:
### watermark pdf might be broken?
return False
### add page to output
finalpdf.addPage(page)
### save the generated pdf to the archive
with open(settings.PDF_ARCHIVE_PATH+filename, 'wb') as fh:
finalpdf.write(fh)
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print('Saved pdf to archive: %s' % settings.PDF_ARCHIVE_PATH+filename)
### return a file object with the data
returnfile = StringIO.StringIO()
finalpdf.write(returnfile)
return returnfile