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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright: (2013-2017) Michael Till Beck <Debianguru@gmx.de>
# License: GPL-2.0+
import io
from lxml import etree
import hashlib
import smtplib
from email.mime.text import MIMEText
from email.header import Header
from urllib.parse import urljoin
import os
import sys
import getopt
import traceback
import time
from time import strftime
import random
import importlib
config = None
defaultEncoding = 'utf-8'
# this is how an empty RSS feed looks like
emptyfeed = """<?xml version="1.0"?>
<rss version="2.0">
<channel>
<title>MailWebsiteChanges Feed</title>
<link>https://github.com/mtill/MailWebsiteChanges</link>
<description>MailWebsiteChanges Feed</description>
</channel>
</rss>"""
mailsession = None
# generates a new RSS feed item
def genFeedItem(subject, content, link, change):
feeditem = etree.Element('item')
titleitem = etree.Element('title')
titleitem.text = subject + ' #' + str(change)
feeditem.append(titleitem)
linkitem = etree.Element('link')
linkitem.text = link
feeditem.append(linkitem)
descriptionitem = etree.Element('description')
descriptionitem.text = content
feeditem.append(descriptionitem)
guiditem = etree.Element('guid')
guiditem.text = str(random.getrandbits(32))
feeditem.append(guiditem)
dateitem = etree.Element('pubDate')
dateitem.text = strftime("%a, %d %b %Y %H:%M:%S %Z", time.localtime())
feeditem.append(dateitem)
return feeditem
# sends mail notification
def sendmail(receiver, subject, content, sendAsHtml, link, encoding=None):
global mailsession, defaultEncoding
if encoding is None:
encoding = defaultEncoding
if sendAsHtml:
baseurl = None
if link is not None:
content = '<p><a href="' + link + '">' + subject + '</a></p>\n' + content
baseurl = urljoin(link, '/')
mail = MIMEText('<html><head><title>' + subject + '</title>' + ('<base href="' + baseurl + '">' if baseurl else '') + '</head><body>' + content + '</body></html>', 'html', encoding)
else:
if link is not None:
content = link + '\n\n' + content
mail = MIMEText(content, 'text', encoding)
mail['From'] = config.sender
mail['To'] = receiver
mail['Subject'] = Header(subject, encoding)
# initialize session once, not each time this method gets called
if mailsession is None:
mailsession = smtplib.SMTP(config.smtphost, config.smtpport)
if config.useTLS:
mailsession.ehlo()
mailsession.starttls()
if config.smtpusername is not None:
mailsession.login(config.smtpusername, config.smtppwd)
mailsession.sendmail(config.sender, receiver.split(','), mail.as_string())
# returns a list of all content that is stored locally for a specific site
def getStoredHashes(name):
result = []
filename = os.path.join(config.workingDirectory, name + ".txt")
if os.path.exists(filename):
with open(filename, 'r') as thefile:
for line in thefile:
result.append(line.rstrip())
return result
# updates list of content that is stored locally for a specific site
def storeHashes(name, contentHashes):
with open(os.path.join(config.workingDirectory, name + '.txt'), 'w') as thefile:
for h in contentHashes:
thefile.write(h + "\n")
def runParsers(parsers, contentList=None):
if contentList is None:
contentList = []
for parser in parsers:
contentList = parser.performAction(contentList)
return contentList
def pollWebsites():
global defaultEncoding
# parse existing feed or create a new one
rssfile = config.rssfile
if not os.path.isabs(rssfile):
rssfile = os.path.join(config.workingDirectory, rssfile)
if config.enableRSSFeed:
if os.path.isfile(rssfile):
feedXML = etree.parse(rssfile)
else:
feedXML = etree.parse(io.StringIO(emptyfeed))
# start polling sites
mailsSent = 0
for site in config.sites:
print('polling site [' + site['name'] + '] ...')
receiver = site.get('receiver', config.receiver)
try:
contentList = runParsers(site['parsers'])
except Exception as e:
# if something went wrong, notify the user
subject = '[' + site['name'] + '] WARNING'
print('WARNING: ' + str(e))
if config.enableMailNotifications:
if config.maxMailsPerSession == -1 or mailsSent < config.maxMailsPerSession:
sendmail(receiver=receiver, subject=subject, content=str(e), sendAsHtml=False, link=None)
mailsSent = mailsSent + 1
if config.enableRSSFeed:
feedXML.xpath('//channel')[0].append(genFeedItem(subject, str(e), "", 0))
continue
sessionHashes = []
changedContents = []
fileHashes = getStoredHashes(site['name'])
for content in contentList:
contenthash = hashlib.md5(content.content.encode(content.encoding)).hexdigest()
if contenthash not in fileHashes:
if config.maxMailsPerSession == -1 or mailsSent < config.maxMailsPerSession:
sessionHashes.append(contenthash)
changedContents.append(content)
subject = '[' + site['name'] + '] ' + content.title
print(' ' + subject)
if config.enableMailNotifications and len(fileHashes) > 0:
sendAsHtml = (content.contenttype == 'html')
sendmail(receiver=receiver, subject=subject, content=content.content, sendAsHtml=sendAsHtml, link=content.uri, encoding=content.encoding)
mailsSent = mailsSent + 1
if config.enableRSSFeed:
feedXML.xpath('//channel')[0].append(genFeedItem(subject, content.content, content.uri, len(changedContents)))
else:
sessionHashes.append(contenthash)
if 'postRun' in site:
runParsers(site['postRun'], changedContents)
if len(changedContents) > 0:
storeHashes(site['name'], sessionHashes)
print(' ' + str(len(changedContents)) + ' updates')
# store feed
if config.enableRSSFeed:
for o in feedXML.xpath('//channel/item[position()<last()-' + str(config.maxFeeds - 1) + ']'):
o.getparent().remove(o)
with open(rssfile, 'w') as thefile:
thefile.write(etree.tostring(feedXML, pretty_print=True, xml_declaration=True, encoding=defaultEncoding).decode(defaultEncoding, errors='ignore'))
if __name__ == "__main__":
configMod = 'config'
dryrun = None
try:
opts, args = getopt.getopt(sys.argv[1:], 'hc:d:', ['help', 'config=', 'dry-run='])
except getopt.GetoptError:
print('Usage: mwc.py --config=config --dry-run=name')
sys.exit(1)
for opt, arg in opts:
if opt == '-h':
print('Usage: mwc.py --config=config')
exit()
elif opt in ('-c', '--config'):
configMod = arg
elif opt in ('-d', '--dry-run'):
dryrun = arg
config = importlib.import_module(configMod)
if dryrun:
for thesite in config.sites:
if thesite['name'] == dryrun:
parseResult = runParsers(thesite['parsers'])
for p in parseResult:
print(p.title)
print(p.content)
print(str(len(parseResult)) + " results")
break
else:
try:
pollWebsites()
except:
msg = str(sys.exc_info()[0]) + '\n\n' + traceback.format_exc()
print(msg)
if config.receiver != '':
sendmail(receiver=config.receiver, subject='[mwc] Something went wrong ...', content=msg, sendAsHtml=False, link=None)
if mailsession:
mailsession.quit()
mailsession = None
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