Proxy server for fetching daily bing wallpaper, can work with SpeedDial2 theme

bing_daily_wallpaper_proxy.py

from datetime import datetime
import BaseHTTPServer
import time
import random
import requests


HOST_NAME = '0.0.0.0'
PORT_NUMBER = 23796

REQUEST_IMAGE_NUM = 15
BING_PIC_URL = 'http://www.bing.com/HPImageArchive.aspx?format=js&idx=0&n={0}'.format(REQUEST_IMAGE_NUM)

# TODO: find a nicer image...
LAST_RESORT = 'http://www.planwallpaper.com/static/images/wallpapers-hd-8000-8331-hd-wallpapers.jpg'


class RedirectHandler(BaseHTTPServer.BaseHTTPRequestHandler):

    # cache image for daily purpose
    _last_update_day = None
    _image_urls = []

    @classmethod
    def should_fetch(cls):
        if cls._last_update_day is None:
            return True

        if cls._last_update_day < datetime.today().day:
            return True

        return False


    @classmethod
    def fetch_bing_pic(cls):
        try:
            r = requests.get(BING_PIC_URL)
            bing_json = r.json()

            images = bing_json['images']

            cls._image_urls = [image['url'] for image in images]
            cls._last_update_day = datetime.today().day
            print '[{0}] - refresh bing url {1}'.format(time.asctime(), cls._image_urls)
        except Exception, e:
            daily_image = LAST_RESORT


    def do_HEAD(s):
        print '[{0}] - request from {1}'.format(time.asctime(), s.client_address)

        if s.should_fetch():
            s.fetch_bing_pic()

        which_image = random.randint(0, len(s._image_urls) - 1)
        redirect_to = s._image_urls[which_image]

        s.send_response(302)
        s.send_header("Location", redirect_to)
        s.end_headers()

    def do_GET(s):
        s.do_HEAD()


if __name__ == '__main__':
    server_class = BaseHTTPServer.HTTPServer
    httpd = server_class((HOST_NAME, PORT_NUMBER), RedirectHandler)
    print time.asctime(), "Server Starts - %s:%s" % (HOST_NAME, PORT_NUMBER)
    try:
        httpd.serve_forever()
    except KeyboardInterrupt:
        pass
    httpd.server_close()
    print time.asctime(), "Server Stops - %s:%s" % (HOST_NAME, PORT_NUMBER)