control spotify from firefox through mpris on sway

mpris-wrapper.py

#!/usr/bin/env python

# goal of this script is to control (play / pause) multimedia played
# on a firefox tab through dbus

# requirements:
# * dbus (session)
import dbus
import sys

if len(sys.argv) < 2:
    print(f"usage: {sys.argv[0]} play-pause|next|previous")
    exit(1)

action = sys.argv[1]

# used to identify a Dbus firefox instance
CHROMIUM_INSTANCE_PATTERN = "org.mpris.MediaPlayer2.firefox"

session = dbus.SessionBus()

# we first need to find out the "instance" of firefox we want to control
dbus = session.get_object(
    "org.freedesktop.DBus",
    "/org/freedesktop/DBus",
)

names = dbus.ListNames()
mpris= None
for name in names:
    if not CHROMIUM_INSTANCE_PATTERN in name:
        continue
    mpris = session.get_object(
        name,
        "/org/mpris/MediaPlayer2",
    )

dbus_interface = "org.mpris.MediaPlayer2.Player"

if mpris:
    match action:
        case "play-pause":
            mpris.PlayPause(dbus_interface=dbus_interface)
        case "previous":
            mpris.Previous(dbus_interface=dbus_interface)
        case "next":
            mpris.Next(dbus_interface=dbus_interface)

sway-config

    bindsym XF86AudioPlay exec ~/.scripts/mpris-wrapper.py play-pause
    bindsym XF86AudioNext exec ~/.scripts/mpris-wrapper.py next
    bindsym XF86AudioPrev exec ~/.scripts/mpris-wrapper.py previous