python3

#!/usr/bin/python3


from flask import Flask, make_response, request
import base64
import datetime
import hashlib
import ujson
import time
import urllib

img = base64.b64decode(b'R0lGODlhAQABAIABAAAAAP///yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==')

class Session(object):
    def __init__(self, request):
        self.request = request
        self.expire_date = datetime.datetime.now()
        self.expire_date = self.expire_date + datetime.timedelta(days=15*365)
    def make_id(self):
        s = request.headers.getlist("X-Forwarded-For")[0] + str(self.expire_date.strftime("%Y%m%d%H%M%S"))
        return(hashlib.sha1(s.encode("utf-8")).hexdigest())

app = Flask(__name__)

@app.route("/")
def index():
    response = make_response(img)
    response.headers['Content-Type'] = 'image/gif'
    response.headers['Cache-Control'] = 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0, max-age=0'
    response.headers['Pragma'] = 'no-cache'
    response.headers['Expires'] = '-1'

    if request.cookies.get("sid") == None:
        session = Session(request)
        sid = session.make_id()
        response.set_cookie('sid', 
                            value=sid)
    else:
        sid = request.cookies.get('sid')
    if request.cookies.get("cid") == None:
        session = Session(request)
        cid = session.make_id()
        response.set_cookie('cid', 
                            value=cid,
                            expires=session.expire_date)
    else:
        cid = request.cookies.get('cid')

    data = {"site": request.args.get("site"),
            "url": urllib.parse.unquote(request.referrer),
            "ip": request.headers.getlist("X-Forwarded-For")[0],
            "user-agent": request.headers.get("User-Agent"),
            "date": datetime.datetime.now().strftime("%Y/%m/%d %H:%M:%S"),
            "unixtime": time.time(),
            "referrer": request.args.get("referrer"),
            "sid": sid,
            "cid": cid}
    print(data)
    f = open("data/" + datetime.datetime.now().strftime("%Y%m%d"), "a")
    f.write(ujson.dumps(data)+"\n")
    f.close()
    return response

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=6000)