optools/net/mirroring/check.py

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Python
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2017-10-08 20:05:50 -04:00
#!/usr/bin/env python3
import argparse
import csv
import datetime
import difflib
import hashlib
import lzma
import os
import pickle
from urllib.request import urlopen
# TODO: to avoid race conditions, we should probably simply ignore/remove
# timestamps and just touch the cache file whenever checking.
class website(object):
def __init__(self, args, csvline):
# Field names
self.fnames = ('UUID', 'url', 'checksum', 'timestamp')
self.args = args
self.parseCSV([csvline])
self.cache = args['cache_dir']
self.cacheControl()
self.remoteFetch()
return
def parseCSV(self, data):
_rows = csv.DictReader(data,
fieldnames = self.fnames,
delimiter = ',',
quotechar = '"')
for r in _rows:
self.meta = r
break # We only want one, so if we SOMEHOW got more than one line...
return()
def cacheControl(self):
os.makedirs(self.cache, exist_ok = True)
self.site = {}
_cachefile = os.path.join(self.cache, self.meta['UUID'])
if os.path.isfile(_cachefile):
with lzma.open(_cachefile, mode = 'rb') as f:
self.site['local'] = pickle.load(f)
else:
with urlopen(self.meta['url']) as _site,\
lzma.open(_cachefile,
mode = 'wb',
check = lzma.CHECK_SHA256,
preset = 9|lzma.PRESET_EXTREME) as f:
_data = _site.read().decode('utf-8')
pickle.dump(_data, f)
self.site['local'] = _data
self.meta['timestamp'] = str(int(datetime.datetime.now().timestamp()))
_hash = hashlib.sha256(self.site['local'].encode('utf-8'))
self.meta['checksum'] = str(_hash.hexdigest())
return()
def remoteFetch(self):
with urlopen(self.meta['url']) as _site:
self.site['remote'] = _site.read().decode('utf-8')
_hash = hashlib.sha256(self.site['remote'].encode('utf-8'))
self.site['remotesum'] = str(_hash.hexdigest())
self.meta['timestamp'] = str(int(datetime.datetime.now().timestamp()))
return()
def compare(self):
# Don't even compare if the checksums match.
if self.site['remotesum'] == self.meta['checksum']:
self.diff = None
#print('{0}: Doing nothing'.format(self.meta['UUID']))
return()
print('{{{0}}}: "{1}":'.format(self.meta['UUID'], self.meta['url']))
diff = difflib.unified_diff(self.site['local'].splitlines(1),
self.site['remote'].splitlines(1))
self.diff = ''.join(diff)
print(self.diff)
with urlopen(self.meta['url']) as _site,\
lzma.open(os.path.join(self.cache, self.meta['UUID']),
mode = 'wb',
check = lzma.CHECK_SHA256,
preset = 9|lzma.PRESET_EXTREME) as f:
_data = _site.read().decode('utf-8')
pickle.dump(_data, f)
return()
def writeCSV(self):
#if self.diff: # We actually WANT to write, because we're updating the last fetch timestamp.
_lines = []
with open(self.args['urls_csv'], 'r') as f:
_f = f.read()
_rows = csv.DictReader(_f.splitlines(),
fieldnames = self.fnames,
delimiter = ',',
quotechar = '"')
for r in _rows:
_uuid = r['UUID']
if _uuid == self.meta['UUID']:
r['checksum'] = self.site['remotesum']
r['timestamp'] = self.meta['timestamp']
_lines.append(r)
with open(self.args['urls_csv'], 'w', newline = '') as f:
_w = csv.DictWriter(f,
fieldnames = self.fnames,
delimiter = ',',
quotechar = '"',
quoting = csv.QUOTE_ALL)
_w.writerows(_lines)
return()
def parseArgs():
# Define defaults
_self_dir = os.path.dirname(os.path.realpath(__file__))
_cache_dir = os.path.join(_self_dir, 'cache')
_urls_csv = os.path.join(_self_dir, 'urls.csv')
args = argparse.ArgumentParser()
args.add_argument('-c',
'--cache-dir',
metavar = '/path/to/cache/dir/',
default = _cache_dir,
dest = 'cache_dir',
type = str,
help = ('The path to where cached versions of websites are stored. ' +
'They are stored in the python binary "pickle" format. ' +
'Default: \n\n\t\033[1m{0}\033[0m').format(_cache_dir))
args.add_argument('-u',
'--urls',
metavar = '/path/to/urls.csv',
default = _urls_csv,
dest = 'urls_csv',
type = str,
help = ('The path to where a CSV file of the URLs to check should be. ' +
'Note that it should be writeable by whatever user the script is running as.' +
'See urls.csv.spec for the specification. ' +
'Default: \n\n\t\033[1m{0}\033[0m').format(_urls_csv))
return(args)
def main():
args = vars(parseArgs().parse_args())
for d in ('cache_dir', 'urls_csv'):
args[d] = os.path.realpath(os.path.expanduser(args[d]))
with open(args['urls_csv'], 'r', newline = '') as f:
_csv = f.read()
for line in _csv.splitlines():
w = website(args, line)
w.compare()
w.writeCSV()
if w.diff:
print(w.diff)
if __name__ == '__main__':
main()