downvote.py

import urllib.parse, urllib.request, json, http.cookiejar, re, sys, time

user = ''
passwd = ''
target = ''

def main():
	# login
	jar = http.cookiejar.CookieJar()
	opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(jar))
	data = {'user':user,'passwd':passwd,'api_type':'json'}
	data = urllib.parse.urlencode(data).encode('utf-8')
	response = opener.open('https://ssl.reddit.com/api/login/'+user, data)

	# parse response	
	jso = json.loads(response.read().decode('utf-8'))["json"]["data"]
	modhash = jso["modhash"]

	lastid = ''
	# get comments
	while (True):

		response = opener.open('http://www.reddit.com/user/'+target)
		toSearch = str(response.read())
		search = re.search('data-fullname="([^"]+)"', toSearch)
		id = search.group(1)

		if (id != lastid):

			data = {'id':id,'dir':-1,'uh':modhash}
			data = urllib.parse.urlencode(data).encode('utf-8')
			response = opener.open('http://www.reddit.com/api/vote', data)

			if (len(response.read()) > 5):
				print(response.read())
				sys.exit('bad')

			lastid = id
			print('downvoted',id)
		
		time.sleep(30)

	

if __name__ == '__main__':
	main()