nfc.py full code

import argparse
import logging
import sys
import time

import pychromecast
from pychromecast.controllers.spotify import SpotifyController
import spotify_token as st
import spotipy
from spotipy.oauth2 import SpotifyOAuth

DEFAULT_SONG_URI = 'spotify:track:5WvDO1ZKap15ehQeNRHJ9H'
CAST_NAME = 'Bedroom speaker'

SP_DC = 'sp_dc cookie was here'
SP_KEY = 'sp_key cookie was here'
CLIENT_ID = 'Client ID was here'
CLIENT_SECRET = 'Client Secret was here'
SPOTIPY_REDIRECT_URI = 'http://localhost'
SPOTIFY_USERNAME = 'Username was here'

parser = argparse.ArgumentParser(description="Cast songs/albums to Google Home via nfc controls.")
parser.add_argument("--show-debug", help="Enable debug log", action="store_true")
parser.add_argument(
    "--uri",
    help='Spotify uri(s) (default: "%(default)s")',
    default=DEFAULT_SONG_URI,
    nargs="+",
)
parser.add_argument("--cast", help='Name of cast device (default: "%(default)s")', default=CAST_NAME)
#parser.add_argument("--user", help="Spotify username", required=True)
#parser.add_argument("--password", help="Spotify password", required=True)
args = parser.parse_args()

if args.show_debug:
    logging.basicConfig(level=logging.DEBUG)

def n():
    print("\n")


chromecasts, browser  = pychromecast.get_listed_chromecasts(friendly_names=[args.cast])
home = None
for _cast in chromecasts:
    if _cast.name == args.cast:
        home = _cast
        break

if not home:
    print('No chromecast with name "{}" discovered'.format(args.cast))
    print("Discovered casts: {}".format(chromecasts))
    sys.exit(1)

print("cast {}".format(home))

home.wait() # Start a new worker thread/wait for connection

# Log device and status
n()
print(home.device)
n()
print(home.status)
n()

spotify_device_id = None

# Create a spotify token
data = st.start_session(SP_DC, SP_KEY)
access_token = data[0]
expires = data[1] - int(time.time())

# Create a spotify client
scope = "user-library-read"

client = spotipy.Spotify(auth=access_token, auth_manager=SpotifyOAuth(client_id=CLIENT_ID, client_secret=CLIENT_SECRET, scope=scope, redirect_uri=SPOTIPY_REDIRECT_URI, username=SPOTIFY_USERNAME))
if args.show_debug:
    spotipy.trace = True
    spotipy.trace_out = True

# Launch the spotify app on the home
sp = SpotifyController(access_token, expires)
home.register_handler(sp)
sp.launch_app()

n()
print(home.status)
n()

if not sp.is_launched and not sp.credential_error:
    print("Failed to launch spotify controller due to timeout")
    sys.exit(1)
if not sp.is_launched and sp.credential_error:
    print("Failed to launch spotify controller due to credential error")
    sys.exit(1)

# Query spotify for active devices
devices_available = client.devices()

# Match active spotify devices with the spotify controller's device id
for device in devices_available["devices"]:
    if device["id"] == sp.device:
        spotify_device_id = device["id"]
        break

if not spotify_device_id:
    print('No device with id "{}" known by Spotify'.format(sp.device))
    print("Known devices: {}".format(devices_available["devices"]))
    sys.exit(1)

# Start playback
if args.uri[0].find("track") > 0:
    client.start_playback(device_id=spotify_device_id, uris=args.uri)
else:
    client.start_playback(device_id=spotify_device_id, context_uri=args.uri[0])

# Shut down discovery
pychromecast.discovery.stop_discovery(browser)