Heroku上のDjangoでwkhtmltopdfにて、HTMLページをPDFページを変換する

HTML/CSSでデザインされたページをPDFに変換する

事前準備

以下のビルドパックをHerokuにインストール

myproject/myproject/myapp/settings.py

PDF_OPTIONS = {
    'page-size': 'A4',
    'orientation': 'Portrait',
    'margin-top': '0.4in',
    'margin-right': '0.4in',
    'margin-bottom': '0.4in',
    'margin-left': '0.4in',
    'encoding': "UTF-8",
    'no-outline': None,
    'header-right': '[page] / [toPage]ページ'
}

myproject/myapp/myapp/views.py

from django.conf import settings
from django.views.generic import ListView

import pdfkit
from django.template import Context
from django.template.loader import render_to_string


class MyModelPdfView(ListView):
    model = MyModel

    def get(self, request, *args, **kwargs):

        object_list = MyModel.objects.all()

        context = {
            'object_list': object_list,
        }
        t = render_to_string('myapp/pdf.html', context)
        if 'DYNO' in os.environ:
            print("environ:DYNO")
            config = pdfkit.configuration(wkhtmltopdf='/app/bin/wkhtmltopdf')
            pdf_buf = pdfkit.from_string(t, False, configuration=config, options=settings.PDF_OPTIONS)
        else:
            pdf_buf = pdfkit.from_string(t, False, options=settings.PDF_OPTIONS)
        response = HttpResponse(pdf_buf, content_type='application/pdf')  # Generates the response as pdf response.
        response['Content-Disposition'] = 'attachment; filename=output.pdf'
        return response