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140 lines
4.3 KiB
Python
140 lines
4.3 KiB
Python
from datetime import datetime
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import unicodedata
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import os
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import subprocess
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import time
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import glob
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from io import BytesIO
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from pypdf import PdfReader, PdfWriter
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from django import template
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from django.template.loader import get_template
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from django.conf import settings
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from django.http import HttpResponse, HttpResponseRedirect
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from wsgiref.util import FileWrapper
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from PIL import Image
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def find_template(template_name):
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for engine in template.engines.all():
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for loader in engine.engine.template_loaders:
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for origin in loader.get_template_sources(template_name):
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if os.path.exists(origin.name):
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return origin.name
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raise template.TemplateDoesNotExist(f"Could not find template: {template_name}")
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def media_path(fp):
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return os.path.join(os.path.join(settings.MEDIA_MEMBERLISTS, "memberlists"), fp)
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def media_dir():
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return os.path.join(settings.MEDIA_MEMBERLISTS, "memberlists")
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def serve_pdf(filename_pdf):
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# provide the user with the resulting pdf file
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with open(media_path(filename_pdf), 'rb') as pdf:
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response = HttpResponse(FileWrapper(pdf))#, content='application/pdf')
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response['Content-Type'] = 'application/pdf'
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response['Content-Disposition'] = 'attachment; filename='+filename_pdf
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return response
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def render_tex(name, template_path, context, save_only=False):
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filename = name + "_" + datetime.today().strftime("%d_%m_%Y")
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filename = filename.replace(' ', '_').replace('&', '').replace('/', '_')
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# drop umlauts, accents etc.
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filename = unicodedata.normalize('NFKD', filename).encode('ASCII', 'ignore').decode()
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filename_tex = filename + '.tex'
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filename_pdf = filename + '.pdf'
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tmpl = get_template(template_path)
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res = tmpl.render(dict(context, creation_date=datetime.today().strftime('%d.%m.%Y')))
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if not os.path.exists(media_dir()):
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os.makedirs(media_dir())
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with open(media_path(filename_tex), 'w', encoding='utf-8') as f:
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f.write(res)
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# compile using pdflatex
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oldwd = os.getcwd()
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os.chdir(media_dir())
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subprocess.call(['pdflatex', '-halt-on-error',filename_tex])
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time.sleep(1)
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# do some cleanup
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for f in glob.glob('*.log'):
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os.remove(f)
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for f in glob.glob('*.aux'):
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os.remove(f)
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#os.remove(filename_tex)
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#os.remove(filename_table)
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os.chdir(oldwd)
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if save_only:
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return filename_pdf
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return serve_pdf(filename_pdf)
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def fill_pdf_form(name, template_path, fields, attachments=[], save_only=False):
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filename = name + "_" + datetime.today().strftime("%d_%m_%Y")
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filename = filename.replace(' ', '_').replace('&', '').replace('/', '_')
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# drop umlauts, accents etc.
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filename = unicodedata.normalize('NFKD', filename).encode('ASCII', 'ignore').decode()
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filename_pdf = filename + '.pdf'
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path = find_template(template_path)
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if not os.path.exists(media_dir()):
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os.makedirs(media_dir())
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reader = PdfReader(path)
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writer = PdfWriter()
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writer.append(reader)
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writer.update_page_form_field_values(None, fields, auto_regenerate=False)
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for fp in attachments:
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try:
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if fp.endswith(".pdf"):
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# append pdf directly
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img_pdf = PdfReader(fp)
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else:
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# convert ensures that png files with an alpha channel can be appended
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img = Image.open(fp).convert("RGB")
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img_pdf = BytesIO()
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img.save(img_pdf, "pdf")
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writer.append(img_pdf)
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except Exception as e:
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print("Could not add image", fp)
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print(e)
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with open(media_path(filename_pdf), 'wb') as output_stream:
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writer.write(output_stream)
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if save_only:
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return filename_pdf
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return serve_pdf(filename_pdf)
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def merge_pdfs(name, filenames, save_only=False):
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merger = PdfWriter()
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for pdf in filenames:
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merger.append(media_path(pdf))
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filename = name + "_" + datetime.today().strftime("%d_%m_%Y")
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filename = filename.replace(' ', '_').replace('&', '').replace('/', '_')
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filename = unicodedata.normalize('NFKD', filename).encode('ASCII', 'ignore').decode()
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filename_pdf = filename + ".pdf"
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merger.write(media_path(filename_pdf))
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merger.close()
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if save_only:
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return filename_pdf
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return serve_pdf(filename_pdf)
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