Collective PDF rendering environment (work-in-progress)
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import os
import json
from flask import Flask, request, render_template, redirect, url_for
from urllib.request import urlopen
from urllib.parse import urlencode
# To sanitize Flask input fields
from markupsafe import Markup, escape
# To sanitize Markdown input
import pypandoc
# import bleach
# To read the Markdown metadat
import markdown
APP = Flask(__name__)
APP.config.from_pyfile('settings.py')
# ---
def get_pad_content(pad_name, ext=""):
if ext:
pad_name = f'{ pad_name }{ ext }'
print(pad_name)
arguments = {
'padID' : pad_name,
'apikey' : APP.config['PAD_API_KEY']
}
api_call = 'getText'
response = json.load(urlopen(f"{ APP.config['PAD_API_URL'] }/{ api_call }", data=urlencode(arguments).encode()))
# create pad in case it does not yet exist
if response['code'] == 1 and 'padID does not exist' == response['message']:
api_call = 'createPad'
urlopen(f"{ APP.config['PAD_API_URL'] }/{ api_call }", data=urlencode(arguments).encode())
api_call = 'getText'
response = json.load(urlopen(f"{ APP.config['PAD_API_URL'] }/{ api_call }", data=urlencode(arguments).encode()))
content = response['data']['text']
return content
def all_pads():
arguments = {
'apikey' : APP.config['PAD_API_KEY'],
}
api_call = 'listAllPads'
response = json.load(urlopen(f"{ APP.config['PAD_API_URL'] }/{ api_call }", data=urlencode(arguments).encode()))
return response
def create_pad_on_first_run(name, ext):
pads = all_pads()
pad = name+ext
if pad not in pads['data']['padIDs']:
# Select default template
if 'md' in ext:
default_template = 'templates/default.md'
elif 'css' in ext:
default_template = 'templates/default.css'
default_template = open(default_template).read()
# Create pad and add the default template
arguments = {
'padID' : pad,
'apikey' : APP.config['PAD_API_KEY'],
'text' : default_template
}
api_call = 'createPad'
json.load(urlopen(f"{ APP.config['PAD_API_URL'] }/{ api_call }", data=urlencode(arguments).encode()))
def md_to_html(md_pad_content):
# Convert Markdown to HTML
# html = markdown.markdown(md_pad_content, extensions=['meta', 'attr_list']) # attr_list does not work
html = pypandoc.convert_text(md_pad_content, 'html', format='md')
# Sanitize the Markdown
# html = bleach.clean(html)
# Another built-in Flask way to sanitize
# html = escape(html)
html = Markup(html)
return html
def get_md_metadata(md_pad_content):
# Read the metadata from the Markdown
md = markdown.Markdown(extensions=['meta'])
md.convert(md_pad_content)
metadata = md.Meta
return metadata
# ---
@APP.route('/', methods=['GET', 'POST'])
def index():
name = False
if request.values.get('name'):
name = escape(request.values.get('name')) # Returns a Markup() object, which is "None" when False
if name:
# This is when the environment is "created"
# The pads are filled with the default templates (pad, stylesheet, template)
exts = ['.md', '.css']
for ext in exts:
create_pad_on_first_run(name, ext)
return redirect(url_for("pad", name=name))
else:
return render_template('start.html', pad_url=APP.config['PAD_URL'])
@APP.route('/<name>/')
def main(name):
return redirect(url_for("pad", name=name))
@APP.route('/<name>/pad/')
def pad(name):
url = f"{ APP.config['PAD_URL'] }/{ name }.md"
return render_template('iframe.html', url=url, name=name.strip(), pad_url=APP.config['PAD_URL'])
@APP.route('/<name>/stylesheet/')
def stylesheet(name):
url = f"{ APP.config['PAD_URL'] }/{ name }.css"
return render_template('iframe.html', url=url, name=name.strip(), pad_url=APP.config['PAD_URL'])
@APP.route('/<name>/html/')
def html(name):
url = f"/{ name }/preview.html"
return render_template('iframe.html', url=url, name=name.strip(), pad_url=APP.config['PAD_URL'])
@APP.route('/<name>/pdf/')
def pdf(name):
url = f"/{name}/pagedjs.html"
return render_template('pdf.html', url=url, name=name.strip(), pad_url=APP.config['PAD_URL'])
# //////////////////
# RENDERED RESOURCES
# //////////////////
# (These are not saved as a file on the server)
@APP.route('/<name>/stylesheet.css')
def css(name):
css = get_pad_content(name, '.css')
# Insert CSS sanitizer here.
return css, 200, {'Content-Type': 'text/css; charset=utf-8'}
@APP.route('/<name>/preview.html')
def preview(name):
# TO GENERATE THE PREVIEW WEBPAGE
md_pad_content = get_pad_content(name, ext='.md')
html = md_to_html(md_pad_content)
metadata = get_md_metadata(md_pad_content)
if metadata:
lang = metadata['language'][0]
title = metadata['title'][0]
else:
lang = "en"
title = "No title"
return render_template('preview.html', name=name.strip(), pad_content=html, lang=lang, title=title)
@APP.route('/<name>/pagedjs.html')
def pagedjs(name):
# TO GENERATE THE PAGED.JS WEBPAGE
md_pad_content = get_pad_content(name, ext='.md')
html = md_to_html(md_pad_content)
metadata = get_md_metadata(md_pad_content)
lang = metadata['language'][0]
title = metadata['title'][0]
return render_template('pagedjs.html', name=name.strip(), pad_content=html, lang=lang, title=title)
# //////////////////
if __name__ == '__main__':
APP.debug = True
APP.env = "development"
APP.run(host="0.0.0.0", port=APP.config["PORTNUMBER"], threaded=True)