Remove the license check from SmartTemplate4

smarttemplate4_crack.py

#!/usr/bin/env python3
# (Requires Python 3.8 or later.)
#
# Remove the license check from the Thunderbird add-on SmartTemplate4:
# https://github.com/RealRaven2000/SmartTemplate4
# This script is up to date as of SmartTemplate4 version 3.7.
#
# Usage: python3 smarttemplate4_crack.py INPUT_XPI_PATH OUTPUT_PATH

import sys, re
from zipfile import ZipFile

input_path, output_path = sys.argv[1:3]

replacers = [
    dict(filename = 'chrome/content/smartTemplate-overlay.js',
        found = False,
        string = 'if (SmartTemplate4.Util.licenseInfo.status != "Valid" && SmartTemplate4.Util.licenseInfo.trialDays<=0)',
        repl = 'if (false)'),
    dict(filename = 'chrome/content/smartTemplate-util.js',
        found = False,
        string = 'hasLicense = util.hasLicense(),',
        repl = 'hasLicense = true,')]

with ZipFile(input_path, 'r') as inp, ZipFile(output_path, 'w') as out:
    for item in inp.infolist():
        x = inp.read(item.filename)
        if replacer := next(
                (r for r in replacers if r['filename'] == item.filename),
                None):
            replacer['found'] = True
            x, n = re.subn(
                re.escape(replacer['string']),
                replacer['repl'],
                x.decode('UTF-8'), count = 1)
            if not n:
                exit('No match: ' + repr(replacer))
            x = x.encode('UTF-8')
        out.writestr(item, x)

if not_found := next((r for r in replacers if not r['found']), None):
    exit('Not found in archive: ' + not_found['filename'])