# Created by @PhilippIRL
# This script patches Spotify's offline.bnk file (this file caches the remote config) to trick Spotify into thinking that your account is enabled for dev tools.
# Spotify will automatically revert this local change after some time when it next fetches the remote config.
# Of course you will have to completely close Spotify before running this script.

import os, sys, platform

systemPlatform = platform.system()

if systemPlatform == 'Windows':
    filePath = os.environ['LOCALAPPDATA'] + '\\Spotify\\offline.bnk'

elif systemPlatform == 'Darwin':
    filePath = os.environ['HOME'] + '/Library/Application Support/Spotify/PersistentCache/offline.bnk'

elif systemPlatform == 'Linux':
    homePath = os.environ['HOME']
    
    snapSpotifyHome = os.environ['HOME'] + '/snap/spotify/common'
    if os.path.exists(snapSpotifyHome):
        homePath = snapSpotifyHome

    filePath = homePath + '/.cache/spotify/offline.bnk'

else:
    print('Sorry, your platform is not yet supported.')
    sys.exit(1)

# check if spotify is installed
if not os.path.exists(filePath):
    print('It seems like you don\'t have Spotify installed.')
    sys.exit(1)

file = open(filePath, 'r+b')
content = file.read()

# find last occurence of string 'app-developer'
loc = content.rindex(b'app-developer')

# 15 bytes after this string is the location we want to patch
patchLoc = loc + 15

# only patch if the value is what we expect
if not (content[patchLoc] == 48 or content[patchLoc] == 50):
    print('Unexpected value', content[patchLoc])
    sys.exit(1)

file.seek(patchLoc)

# change one byte to 50 (ascii '2')
file.write(bytes([50]))

file.close()