latestcast.py

import urllib, subprocess, os

# fetches latest youtube video from specified channel and casts to chromecast
# needs to be run as root to scan the network for the mac address
# requires: castnow and arp-scan installed

author = "rhettandlink2" # youtube channel
mac = "UR:MA:CA:DD:RE:SS" # chromecast mac address
iface = "wlan0" # interface to LAN

inp = urllib.urlopen(r'https://www.youtube.com/user/'+author+'/videos')
first = '<a href="/watch?v='
content = inp.read()
inp.close()

loc = content.find(first)

if loc < 0:
    exit()

trimcontent = content[loc+len(first):]
loc2 = trimcontent.find("\"")

if loc2 < 0:
    exit()

output = trimcontent[:loc2]

try:
    network = subprocess.check_output("arp-scan --interface="+iface+" --localnet | grep "+mac, shell=True)
except:
    print "arp-scan failed, make sure it is installed and you are root"
    exit()

ip = network.split()[0]
url = "https://youtube.com/watch?v="+output

os.system("castnow --quiet --address "+ip+" "+url+" &")