<!DOCTYPE html>
<meta charset=utf-8>
<title>The preload's referrerpolicy attribute should be respected</title>
<meta name="timeout" content="long">
<script src="resources/dummy.js?link-header-preload2"></script>
<script src="/common/get-host-info.sub.js"></script>
<script src="/common/utils.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/preload/resources/preload_helper.js"></script>
<body>
    <p>The preload's referrerpolicy attribute should be respected,
    and consumed regardless of consumer referrer policy</p>
<script>
window.referrers = {};
const {REMOTE_ORIGIN} = get_host_info();
const loaders = {
    header: async (t, {preloadPolicy, resourcePolicy, href, id}) => {
        const iframe = document.createElement('iframe');
        const params = new URLSearchParams();
        params.set('href', href);
        params.set('resource-policy', resourcePolicy);
        if (preloadPolicy === '')
            params.set('preload-policy', '');
        else
            params.set('preload-policy', `referrerpolicy=${preloadPolicy}`);
        iframe.src = `resources/link-header-referrer-policy.py?${params.toString()}`;
        t.add_cleanup(() => iframe.remove());
        const done = new Promise(resolve => {
            window.addEventListener('message', ({data}) => {
                if (id in data.referrers)
                    resolve({actualReferrer: data.referrers[id], entries: data.entries});
            })
        });
        document.body.appendChild(iframe);
        const {actualReferrer, entries} = await done;
        return {actualReferrer, unsafe: iframe.src, entries};
    },
    element: async (t, {preloadPolicy, resourcePolicy, href, id}) => {
        const link = document.createElement('link');
        link.href = href;
        link.as = 'script';
        link.rel = 'preload';
        link.referrerPolicy = preloadPolicy;
        const preloaded = new Promise(resolve => link.addEventListener('load', resolve));
        t.add_cleanup(() => link.remove());
        document.head.appendChild(link);
        await preloaded;
        const script = document.createElement('script');
        script.src = href;
        script.referrerPolicy = resourcePolicy;
        const loaded = new Promise(resolve => script.addEventListener('load', resolve));
        document.body.appendChild(script);
        await loaded;
        return {unsafe: location.href, actualReferrer: window.referrers[id], entries: performance.getEntriesByName(script.src).length}
    },
};

function test_referrer_policy(preloadPolicy, resourcePolicy, crossOrigin, type) {
    promise_test(async t => {
        const id = token();
        const href = `${crossOrigin ? REMOTE_ORIGIN : ''}/preload/resources/echo-referrer.py?uid=${id}`;
        const {actualReferrer, unsafe, entries} = await loaders[type](t, {preloadPolicy, resourcePolicy, href, id})
        assert_equals(entries, 1);
        const origin = window.origin + '/';
        switch (preloadPolicy) {
            case '':
                assert_equals(actualReferrer, crossOrigin ? origin : unsafe);
                break;

            case 'no-referrer':
                assert_equals(actualReferrer, '');
                break;

            case 'same-origin':
                assert_equals(actualReferrer, crossOrigin ? '' : unsafe);
                break;

            case 'origin-when-cross-origin':
            case 'strict-origin-when-cross-origin':
                assert_equals(actualReferrer, crossOrigin ? origin : unsafe);
                break;

            case 'origin':
                assert_equals(actualReferrer, origin);
                break;

            case 'unsafe-url':
                assert_equals(actualReferrer, unsafe);
                break;

            default:
                assert_equals(actualReferrer, '');
                break;

        }
    }, `referrer policy (${preloadPolicy} -> ${resourcePolicy}, ${type}, ${crossOrigin ? 'cross-origin' : 'same-origin'})`)
}
const policies = [
"",
"no-referrer",
"same-origin",
"origin",
"origin-when-cross-origin",
"strict-origin-when-cross-origin",
"unsafe-url"]

for (const preloadPolicy of policies) {
    for (const resourcePolicy of policies) {
        for (const type of ['element', 'header']) {
            for (const crossOrigin of [true, false]) {
                test_referrer_policy(preloadPolicy, resourcePolicy, crossOrigin, type);
            }
        }
    }
}

</script>
</body>
