Snapshot Proxy for mjpg_streamer

#!/usr/bin/env python
#Licence: GPLv3.0
#Copyright: 2017 Krasimir S. Stefanov (lokster)
#Website: http://lokspace.eu

import SocketServer
from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
import urllib2
import base64
import os
import time

MJS_AUTH_USER = "the user for your mjpg_streamer stream"
MJS_AUTH_PASS = "the password for your mjpg_streamer stream"
MJS_SNAPSHOT_ADDRESS = "the mjpg_streamer snapshot url"
AUTH_USER = "the user for accessing this snapshot"
AUTH_PASS = "the password for accessing this snapshot"
PORT_NUMBER = 8083

os.chdir(os.path.dirname(os.path.abspath(__file__)))
authString = "Basic %s" % base64.b64encode('%s:%s' % (AUTH_USER, AUTH_PASS))


class Handler(BaseHTTPRequestHandler):
    ''' Main class to present webpages and authentication. '''
    def do_HEAD(self):
        print "send header"
        self.send_response(200)
        self.send_header('Content-type', 'image/jpeg')
        #self.send_header('Content-type', 'text/html')
        self.end_headers()

    def do_AUTHHEAD(self):
        print "send header"
        self.send_response(401)
        self.send_header('WWW-Authenticate', 'Basic realm=\"Snapshot Proxy\"')
        self.send_header('Content-type', 'text/html')
        self.end_headers()

    def do_GET(self):
        ''' Present frontpage with user authentication. '''
        if self.headers.getheader('Authorization') == None:
            self.do_AUTHHEAD()
            self.wfile.write('no auth header received')
            pass
        elif self.headers.getheader('Authorization') == authString:
            self.do_HEAD()
            if (MJS_AUTH_USER and MJS_AUTH_PASS):
                os.system('wget -O- "%s" --user="%s" --password="%s" 2>/dev/null | convert - /tmp/snapshot.jpg 2>/dev/null' % (MJS_SNAPSHOT_ADDRESS, MJS_AUTH_USER, MJS_AUTH_PASS))
            else:
                os.system('wget -O- "%s" 2>/dev/null | convert - /tmp/snapshot.jpg 2>/dev/null' % SNAPSHOT_ADDRESS)
            self.wfile.write(open('/tmp/snapshot.jpg', 'r').read())
            os.system('rm /tmp/snapshot.jpg')
            pass
        else:
            self.do_AUTHHEAD()
            self.wfile.write(self.headers.getheader('Authorization'))
            self.wfile.write('not authenticated')
            pass

try:
    #Create a web server and define the handler to manage the
    #incoming request
    server = HTTPServer(('', PORT_NUMBER), Handler)
    print 'Started httpserver on port ' , PORT_NUMBER

    #Wait forever for incoming htto requests
    server.serve_forever()

except KeyboardInterrupt:
    print '^C received, shutting down the web server'
    server.socket.close()