# SPDX-License-Identifier: CC0-1.0

"""
Haketilo unit tests - routing HTTP requests through background 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
from selenium.webdriver.support.ui import WebDriverWait

from ..script_loader import load_script
from ..world_wide_library import some_data

datas = {
    'resource':       'https://anotherdoma.in/resource/blocked/by/CORS.json',
    'nonexistent':    'https://nxdoma.in/resource.json',
    'invalid':        'w3csucks://invalid.url/',
    'redirected_ok':  'https://site.with.scripts.block.ed',
    'redirected_err': 'https://site.with.scripts.block.ed'
}

for name, url in [*datas.items()]:
    datas[name] = {'url': url}

datas['redirected_ok']['init']  = {'redirect': 'follow'}
datas['redirected_err']['init'] = {'redirect': 'error'}

content_script = '''\
const datas = %s;

async function fetch_resources() {
    const results = {};
    const promises = [];
    for (const [name, data] of Object.entries(datas)) {
        const sending = browser.runtime.sendMessage(["CORS_bypass", data]);
        promises.push(sending.then(response => results[name] = response));
    }

    await Promise.all(promises);

    window.wrappedJSObject.haketilo_fetch_results = results;
}

fetch_resources();
'''

content_script = content_script % json.dumps(datas);

@pytest.mark.ext_data({
    'content_script': content_script,
    'background_script':
    lambda: load_script('background/CORS_bypass_server.js') + '; start();'
})
@pytest.mark.usefixtures('webextension')
def test_CORS_bypass_server(driver, execute_in_page):
    """
    Test if CORS bypassing works and if errors get properly forwarded.
    """
    driver.get('https://gotmyowndoma.in/')

    # First, verify that requests without CORS bypass measures fail.
    results = execute_in_page(
        '''
        const result = {};
        let promises = [];
        for (const [name, data] of Object.entries(arguments[0])) {
            const [ok_cb, err_cb] =
                ["ok", "err"].map(status => () => result[name] = status);
            promises.push(fetch(data.url).then(ok_cb, err_cb));
        }
        // Make the promises non-failing.
        promises = promises.map(p => new Promise(cb => p.then(cb, cb)));
        returnval(Promise.all(promises).then(() => result));
        ''',
        {**datas, 'sameorigin': './nonexistent_resource'})

    assert results == dict([*[(k, 'err') for k in datas.keys()],
                            ('sameorigin', 'ok')])

    done = lambda d: d.execute_script('return window.haketilo_fetch_results;')
    results = WebDriverWait(driver, 10).until(done)

    assert set(results['invalid'].keys()) == {'error'}
    assert results['invalid']['error']['fileName'].endswith('background.js')
    assert type(results['invalid']['error']['lineNumber']) is int
    assert type(results['invalid']['error']['message']) is str
    assert results['invalid']['error']['name'] == 'TypeError'

    assert results['nonexistent']['status'] == 404
    assert results['nonexistent']['statusText'] == 'Not Found'
    assert any([name.lower() == 'content-length'
                for name, value in results['nonexistent']['headers']])
    assert bytes.fromhex(results['nonexistent']['body']) == \
        b'Handler for this URL not found.'

    assert results['resource']['status'] == 200
    assert results['resource']['statusText'] == 'OK'
    assert any([name.lower() == 'content-length'
                for name, value in results['resource']['headers']])
    assert bytes.fromhex(results['resource']['body']) == b'{"some": "data"}'

    assert results['redirected_ok']['status'] == 200
    assert results['redirected_err']['error']['name'] == 'TypeError'