Code examples to follow along with http://brett.is/writing/about/third-party-tracking-pixels/
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91 lines
3.2 KiB
91 lines
3.2 KiB
from Cookie import SimpleCookie
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from urlparse import parse_qs
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from uuid import uuid4
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from wsgiref.simple_server import make_server
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def tracking_server(environ, respond):
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"""Function used to handle all requests made to
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this tracking server
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"""
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if environ['PATH_INFO'] == '/track.js':
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return track_user(environ, respond)
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elif environ['PATH_INFO'] == '/buster.js':
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return cache_buster(environ, respond)
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elif environ['PATH_INFO'] == '/favicon.ico':
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respond('204 NO CONTENT', [])
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return ['']
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else:
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return html_content(environ, respond)
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def track_user(environ, respond):
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"""Function used to handle the route: /track.js
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This will check to make sure that the user
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has a cookie id=<USER_ID>, if not then we will
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generate a new uuid4 id for them and set the
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cookie.
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This will also print to stdout when we generate
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a new cookie as well as what the user searched for.
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"""
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cookies = SimpleCookie()
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cookies.load(environ.get('HTTP_COOKIE', ''))
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if not cookies.get('id'):
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user_id = uuid4()
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print 'User did not have id, giving: %s' % user_id
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else:
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user_id = cookies['id'].value
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query = parse_qs(environ['QUERY_STRING'])
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search = query.get('s', [''])[0]
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print 'User %s Searched For: %s' % (user_id, search)
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headers = [('Content-Type', 'application/javascript'),
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('Set-Cookie', 'id=%s' % user_id)]
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respond('200 OK', headers)
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return ['']
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def cache_buster(environ, respond):
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"""Function used to handle the /buster.js route
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This will simply return our cache buster javascript
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to the user, which adds a script tag to call /track.js
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"""
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headers = [('Content-Type', 'application/javascript')]
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respond('200 OK', headers)
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cb_js = """
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function getParameterByName(name){
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name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
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var regexS = "[\\?&]" + name + "=([^&#]*)";
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var regex = new RegExp(regexS);
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var results = regex.exec(window.location.search);
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if(results == null)
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return "";
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else
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return decodeURIComponent(results[1].replace(/\+/g, " "));
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}
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var now = new Date().getTime();
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var random = Math.random() * 99999999999;
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var search = getParameterByName('search');
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document.write('<script src="/track.js?t=' + now + '&r=' + random + '&s=' + search + '"></script>');
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"""
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return [cb_js]
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def html_content(environ, respond):
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"""Function used to handle any route that is not /track.js
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This will return to the user a very basic html page that has
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a script that to call our /buster.js script
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"""
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headers = [('Content-Type', 'text/html')]
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respond('200 OK', headers)
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return ['<html><head></head><body><h2>Welcome</h2><script src="/buster.js"></script></body></html>\n']
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if __name__ == '__main__':
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try:
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httpd = make_server('', 8000, tracking_server)
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print 'Tracking Server Listening on Port 8000...'
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httpd.serve_forever()
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except KeyboardInterrupt:
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print 'Exiting...'
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