A Django class-based view generating PDF responses using WeasyPrint.
Install and update using pip:
pip install -U django-weasyprint
WeasyPrint is automatically installed as a dependency of this package. If you run into any problems be sure to check their install instructions for help!
Tip
In version 53 WeasyPrint switched to pydyf as PDF generator instead of Cairo. With that change PNG output was dropped and you might encounter other changes in the generated PDF.
You can continue using WeasyPrint/Cairo by installing django-weasyprint 1.x!
Use WeasyTemplateView as class based view base class or the
mixin WeasyTemplateResponseMixin on a TemplateView (or subclass
thereof).
# views.py
import functools
from django.conf import settings
from django.views.generic import DetailView
from django_weasyprint import WeasyTemplateResponseMixin
from django_weasyprint.views import WeasyTemplateResponse
from django_weasyprint.utils import django_url_fetcher
class MyDetailView(DetailView):
# vanilla Django DetailView
template_name = 'mymodel.html'
def custom_url_fetcher(url, *args, **kwargs):
# rewrite requests for CDN URLs to file path in STATIC_ROOT to use local file
cloud_storage_url = 'https://s3.amazonaws.com/django-weasyprint/static/'
if url.startswith(cloud_storage_url):
url = 'file://' + url.replace(cloud_storage_url, settings.STATIC_URL)
return django_url_fetcher(url, *args, **kwargs)
class CustomWeasyTemplateResponse(WeasyTemplateResponse):
# customized response class to pass a kwarg to URL fetcher
def get_url_fetcher(self):
# disable host and certificate check
context = ssl.create_default_context()
context.check_hostname = False
context.verify_mode = ssl.CERT_NONE
return functools.partial(custom_url_fetcher, ssl_context=context)
class PrintView(WeasyTemplateResponseMixin, MyDetailView):
# output of MyDetailView rendered as PDF with hardcoded CSS
pdf_stylesheets = [
settings.STATIC_ROOT + 'css/app.css',
]
# show pdf in-line (default: True, show download dialog)
pdf_attachment = False
# custom response class to configure url-fetcher
response_class = CustomWeasyTemplateResponse
class DownloadView(WeasyTemplateResponseMixin, MyDetailView):
# suggested filename (is required for attachment/download!)
pdf_filename = 'foo.pdf'
# set PDF variant to 'pdf/ua-1' (see weasyprint.DEFAULT_OPTIONS)
pdf_options = {'pdf_variant': 'pdf/ua-1'}
class DynamicNameView(WeasyTemplateResponseMixin, MyDetailView):
# dynamically generate filename
def get_pdf_filename(self):
return 'foo-{at}.pdf'.format(
at=timezone.now().strftime('%Y%m%d-%H%M'),
)# tasks.py
from celery import shared_task
from django.template.loader import render_to_string
from django_weasyprint.utils import django_url_fetcher
@shared_task
def generate_pdf(filename='mymodel.pdf'):
weasy_html = weasyprint.HTML(
string=render_to_string('mymodel.html'),
url_fetcher=django_url_fetcher,
base_url='file://',
)
weasy_html.write_pdf(filename)<!-- mymodel.html -->
<!doctype html>
<html>
<head>
<!-- Use "static" template tag and configure STATIC_URL as usual. -->
<link rel="stylesheet" href="{% static 'css/app.css' %}" />
</head>
<body>
Hello PDF-world!
</body>
</html>By default WeasyTemplateResponse determines the base_url for
weasyprint.HTML and weasyprint.CSS automatically using Django's
request.build_absolute_uri().
To disable that set WEASYPRINT_BASEURL to a fixed value, e.g.:
# Disable prefixing relative URLs with request.build_absolute_uri().
# Instead, handle them as absolute file paths.
WEASYPRINT_BASEURL = '/'See CHANGELOG.md