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main.py
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import re
import lxml.html
from flask import Flask, url_for, abort, render_template
import logging
logger = logging.getLogger("gs-scroller.main")
if __name__ == '__main__':
logging.getLogger("gs-scroller").setLevel(logging.INFO)
else:
logging.getLogger("gs-scroller").setLevel(logging.INFO)
try:
import google.cloud.logging
logging_client = google.cloud.logging.Client()
from google.cloud.logging.handlers import CloudLoggingHandler, setup_logging
logging_handler = CloudLoggingHandler(logging_client)
except ImportError:
logger.warning("Google's logging module could not be imported")
else:
setup_logging(logging_handler)
logger.info("Google's logging module was imported")
logger.debug("Debug messages will be logged")
from converters import (
Base64Converter, DigitsConverter, DigitListConverter )
from cache import temporary_cache
import urlread
GOOGLE_TIMEOUT=30
app = Flask(__name__)
app.url_map.converters['base64'] = Base64Converter
app.url_map.converters['digits'] = DigitsConverter
app.url_map.converters['digitlist'] = DigitListConverter
@app.route('/')
def default():
return render_template('default.html')
@app.route('/e/<base64:sid>/<digits:gid>')
def sheet_e(sid, gid):
return sheet(sid="e/"+sid, gid=gid)
@app.route('/<base64:sid>/<digits:gid>')
def sheet(sid, gid):
return convert_google_sheet(sid, gid)
@app.route('/e/<base64:sid>/')
def spreadsheet_e(sid):
return spreadsheet(sid="e/"+sid)
@app.route('/<base64:sid>/')
def spreadsheet(sid):
title, sheets = google_spreadsheet_data(sid)
if not sheets:
raise GoogleSpreadsheetNotFound()
return render_template('spreadsheet.html', title=title, links=True,
sid=sid, sheets=sheets, )
@app.route('/e/<base64:sid>/(<digitlist:gids>)')
def spreadsheet_selection_e(sid, gids):
return spreadsheet_selection(sid="e/"+sid, gids=gids)
@app.route('/<base64:sid>/(<digitlist:gids>)')
def spreadsheet_selection(sid, gids):
try:
title, sheets = google_spreadsheet_data(sid)
except GoogleSpreadsheetNotResponding as error:
error.sid = error.gid = None
raise
gids = set(gids)
sheets = [ sheet
for sheet in sheets
if sheet['gid'] in gids ]
if not sheets:
raise GoogleSpreadsheetNotFound()
return render_template('spreadsheet.html', title=title, links=False,
sid=sid, sheets=sheets, )
@temporary_cache(60*5)
def convert_google_sheet(sid, gid):
html = parse_google_document(
'https://docs.google.com/spreadsheets/d/{sid}/pubhtml/sheet?gid={gid}'
.format(sid=sid, gid=gid),
errhelp={'sid' : sid, 'gid' : gid} )
for script in html.iter('script'):
script.getparent().remove(script)
for link in html.find('head').iter('link'):
link.rewrite_links(
lambda s:
'https:' + s
if s.startswith('//') else
'https://docs.google.com' + s )
html.find('head').append(lxml.html.Element( 'link',
rel='stylesheet', href=url_for('static', filename='metatable.css'),
))
html.find('body').append(lxml.html.Element( 'script',
src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"
))
html.find('body').append(lxml.html.Element( 'script',
src=url_for('static', filename='metatable.js')
))
script = lxml.html.Element('script')
script.text = ( "$(init); "
"function init() { "
"$('body').css('overflow', 'hidden'); "
"var $viewport = $('#sheets-viewport').detach(); "
"var $table = $viewport.find('table').detach(); "
"var $svgs = $viewport.find('svg'); "
"var $metatable = create_metatable($table); "
"$('body').empty(); "
"$('body').append($svgs); "
"$('body').append($metatable); "
"$viewport.remove(); "
"$metatable.resize(); "
" }" )
html.find('body').append(script)
return b'<!DOCTYPE html>\n<meta charset="UTF-8">\n' + \
lxml.html.tostring(html, encoding='utf-8')
SHEET_PATTERN = re.compile(
r'{[^{}]*'
r'name: "(?P<name>[^"]+)"'
r'[^{}]*'
r'gid: "(?P<gid>\d+)"'
r'[^{}]*}' )
@temporary_cache(60*5)
def google_spreadsheet_data(sid):
html = parse_google_document(
'https://docs.google.com/spreadsheets/d/{sid}/pubhtml?widget=true'
.format(sid=sid),
errhelp={'sid' : sid} )
title = html.find('head/title').text
sheets = []
for script in html.iter('script'):
if script.text is None:
continue
for match in SHEET_PATTERN.finditer(script.text):
sheets.append(match.groupdict())
if sheets:
break
return title, sheets
PARSER = lxml.html.HTMLParser(encoding="utf-8")
def parse_google_document(url, errhelp=None, parser=PARSER):
try:
reply_text = urlread.urlread(url, timeout=GOOGLE_TIMEOUT)
except urlread.NotFound:
raise GoogleSpreadsheetNotFound(errhelp)
except urlread.NotResponding:
raise GoogleSpreadsheetNotResponding(errhelp)
return lxml.html.fromstring(reply_text, parser=parser)
class GoogleSpreadsheetException(Exception):
def __init__(self, errhelp=None):
super(GoogleSpreadsheetException, self).__init__(self)
if errhelp is not None:
self.sid = errhelp.get('sid')
self.gid = errhelp.get('gid')
else:
self.sid = self.gid = None
class GoogleSpreadsheetNotFound(GoogleSpreadsheetException):
pass
class GoogleSpreadsheetNotResponding(GoogleSpreadsheetException):
pass
@app.errorhandler(GoogleSpreadsheetNotFound)
def sheet_not_found(exception):
return render_template('google-404.html', sid=exception.sid, gid=exception.gid), 404
@app.errorhandler(GoogleSpreadsheetNotResponding)
def sheet_timeout(exception):
return render_template('google-504.html', sid=exception.sid, gid=exception.gid), 504
@app.errorhandler(404)
def not_found(exception):
return render_template('404.html'), 404
if __name__ == '__main__':
app.run(host='0.0.0.0', port=8080, debug=False)