# SPDX-License-Identifier: CC0-1.0

"""
Haketilo unit tests - enforcing script blocking policy from content script
"""

# This file is part of Haketilo
#
# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the CC0 1.0 Universal License as published by
# the Creative Commons Corporation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# CC0 1.0 Universal License for more details.

import pytest
import json
import urllib.parse
from selenium.webdriver.support.ui import WebDriverWait

from ..script_loader import load_script
from .utils import are_scripts_allowed

# For simplicity, we'll use one nonce in all test cases.
nonce = 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855'

allow_policy = {'allow': True}
block_policy = {
    'allow': False,
    'csp': f"prefetch-src 'none'; script-src-attr 'none'; script-src 'none'; script-src-elem 'none'; frame-src http://* https://*;"
}
payload_policy = {
    'mapping': 'somemapping',
    'payload': {'identifier': 'someresource'},
    'csp': f"prefetch-src 'none'; script-src-attr 'none'; script-src 'nonce-{nonce}'; script-src-elem 'nonce-{nonce}';"
}

content_script = load_script('content/policy_enforcing.js') + ''';{
const smuggled_what_to_do = /^[^#]*#?(.*)$/.exec(document.URL)[1];
const what_to_do = smuggled_what_to_do === "" ? {allow: true} :
                   JSON.parse(decodeURIComponent(smuggled_what_to_do));

if (what_to_do.csp_off) {
    const orig_DOMParser = window.DOMParser;
    window.DOMParser = function() {
        parser = new orig_DOMParser();
        this.parseFromString = () => parser.parseFromString('', 'text/html');
    }
}

if (what_to_do.onbeforescriptexecute_off)
    prevent_script_execution = () => {};

if (what_to_do.sanitize_script_off) {
    sanitize_script = () => {};
    desanitize_script = () => {};
}

enforce_blocking(what_to_do.policy);
}'''

def get(driver, page, what_to_do):
    driver.get(page + '#' + urllib.parse.quote(json.dumps(what_to_do)))
    driver.execute_script('window.before_reload = true; location.reload();')
    done = lambda _: not driver.execute_script('return window.before_reload;')
    WebDriverWait(driver, 10).until(done)

@pytest.mark.ext_data({'content_script': content_script})
@pytest.mark.usefixtures('webextension')
def test_policy_enforcing(driver, execute_in_page):
    """
    A test case of sanitizing <script>s and <meta>s in pages.
    """
    # First, see if scripts run when not blocked.
    get(driver, 'https://gotmyowndoma.in/scripts_to_block_1.html', {
        'policy': allow_policy
    })

    for i in range(1, 3):
        driver.find_element_by_id(f'clickme{i}').click()

    assert set(driver.execute_script('return window.__run || [];')) == \
        {'inline', 'on', 'href', 'src', 'data'}

    # Now, verify scripts don't run when blocked.
    get(driver, 'https://gotmyowndoma.in/scripts_to_block_1.html', {
        'policy': block_policy
    })

    for i in range(1, 3):
        driver.find_element_by_id(f'clickme{i}').click()

    assert set(driver.execute_script('return window.__run || [];')) == set()
    assert not are_scripts_allowed(driver)

    # Now, verify only scripts with nonce can run when payload is injected.
    get(driver, 'https://gotmyowndoma.in/scripts_to_block_1.html', {
        'policy': payload_policy
    })

    for i in range(1, 3):
        driver.find_element_by_id(f'clickme{i}').click()

    assert set(driver.execute_script('return window.__run || [];')) == set()
    assert not are_scripts_allowed(driver)
    assert are_scripts_allowed(driver, nonce)