Auto wallpaper changer for National Geographic - Photo of the day

natgeo-photo_of_the_day.desktop

[Desktop Entry]
Type=Application
Exec=natgeo-photo_of_the_day.py
Hidden=false
NoDisplay=false
X-GNOME-Autostart-enabled=true
Name=NatGeo Photo of the day - Wallpaper
Comment=Auto wallpaper changer for National Geographic - Photo of the day

natgeo-photo_of_the_day.py

#!/usr/bin/env python3

import json
import os
import schedule  # pip install schedule
import subprocess
import time
from base64 import b64decode
from datetime import datetime
from urllib import request
from urllib.error import URLError, HTTPError

DEBUG = False
URL = 'aHR0cHM6Ly93d3cubmF0aW9uYWxnZW9ncmFwaGljLmNvbS9waG90b2dyYXBoeS9waG90by1vZi10aGUtZGF5L19qY3JfY29udGVudC8uZ2FsbGVyeS5qc29u'


def _get_url(url):
    # if network is not ready (wakeup from suspend etc.), loop until connection to establish.
    while True:
        try:
            response = request.urlopen(url)
        except URLError or HTTPError:
            time.sleep(1)
        else:
            # TODO: Find a elegant way to check VPN connection is up after wake from suspend and then execute
            time.sleep(2)  # wait for VPN connection after wake from suspend.
            data = json.load(response)['items'][0]['image']
            return data['title'], data['id'], data['uri']


def _wallpaper_file():
    title, _id, photo_of_the_day_url = _get_url(b64decode(URL).decode('utf-8'))
    background_folder = '{}/.local/share/backgrounds/NatGeo - Photo of the Day/'.format(os.environ['HOME'])
    background_file = '{}.jpg'.format(_id)
    if not os.path.exists(background_folder):
        os.mkdir(background_folder)
    return background_folder + background_file, photo_of_the_day_url


def _download_picture(photo_of_the_day_url, background_file):
    img_data = request.urlopen(photo_of_the_day_url)
    with open(background_file, 'wb') as f:
        f.write(img_data.read())


def _set_wallpaper(background_file):
    file = "'file://{}'".format(background_file)
    subprocess.call(['gsettings', 'set', 'org.gnome.desktop.background', 'picture-options', "'zoom'"])
    subprocess.call(['gsettings', 'set', 'org.gnome.desktop.background', 'picture-uri', file])


def _changing_wallpaper(message):
    background_file, photo_of_the_day_url = _wallpaper_file()
    if not os.path.isfile(background_file):
        if DEBUG:
            print(message)
        _download_picture(photo_of_the_day_url, background_file)
        _set_wallpaper(background_file)
    else:
        if DEBUG:
            print('NatGeo - Photo of the Day: Wallpaper already downloaded or not changed since last updated. Using downloaded wallpaper.')
        _set_wallpaper(background_file)


def _bg_change_time():
    # Photo of the day updated at 5AM UTC everyday. So calculate it for any timezone.
    time_difference = datetime.utcnow() - datetime.utcnow().replace(hour=5, minute=0, second=0, microsecond=0)
    return (datetime.now() - time_difference).strftime('%H:%M')


_changing_wallpaper('NatGeo - Photo of the Day: First run. Setting wallpaper.')  # set wallpaper on first run
schedule.every().day.at(_bg_change_time()).do(_changing_wallpaper, 'NatGeo - Photo of the Day: Scheduled change wallpaper.')

while True:
    schedule.run_pending()
    time.sleep(1)