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<!doctype html>
<meta charset="utf-8">
<title>Referrer Policy: iframe src="about:blank"</title>
<link rel="author" title="Hiroshige Hayashizaki" href="mailto:hiroshige@chromium.org">
<link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<meta name="referrer" content="origin">
<body>
<script>
const testFetchClientReferrer =
async_test("The fetch() API in an about:blank iframe with the 'client' " +
"referrer is fetched with no 'Referer' header");
const testFetchURLReferrer =
async_test("The fetch() API in an about:blank iframe with a custom URL " +
"referrer is fetched with a 'Referer` header that uses the " +
"outer document's URL along with its referrer policy");
const testDocumentReferrer =
async_test("The value of document.referrer in an about:blank iframe is the " +
"outer document's full URL, regardless of referrer policy");
const testSubresource =
async_test("A subresource fetched from an about:blank iframe is fetched " +
"with no 'Referer' header");
window.addEventListener("message", msg => {
const test_name = msg.data.test;
const referrer = msg.data.referrer;
if (test_name === "testFetchClientReferrer") {
testFetchClientReferrer.step_func_done(() => {
// Because the URL of the Document of <iframe src="about:blank"> is
// "about:blank", the stripped URL is no referrer:
// https://w3c.github.io/webappsec-referrer-policy/#strip-url.
assert_equals(referrer, undefined);
})();
} else if (test_name === "testFetchURLReferrer") {
// <iframe src="about:blank"> inherits its parent's referrer policy.
// Note: Setting an explicit URL as referrer succeeds
// because the same-origin check at
// https://fetch.spec.whatwg.org/#dom-request
// is done against <iframe>'s origin, which inherits the parent
// Document's origin == location.orgin. Furthermore, since the iframe
// inherits its parent's referrer policy, the URL should be restricted to
// its origin.
testFetchURLReferrer.step_func_done(() => {
assert_equals(referrer, location.origin + '/');
})();
} else if (test_name === "testDocumentReferrer") {
// The referrer of the initial document in an about:blank iframe is set to
// its creating document's URL, unredacted by a referrer policy, as per step
// 13 of:
// https://html.spec.whatwg.org/multipage/browsers.html#creating-a-new-browsing-context.
testDocumentReferrer.step_func_done(() => {
assert_equals(referrer, location.href);
})();
} else if (test_name === "testSubresource") {
// Because the URL of the Document of <iframe src="about:blank"> is
// "about:blank", the stripped URL is no referrer:
// https://w3c.github.io/webappsec-referrer-policy/#strip-url.
testSubresource.step_func_done(() => {
assert_equals(referrer, "");
})();
}
});
const iframe = document.createElement("iframe");
iframe.addEventListener("load", function() {
const iframe_script = iframe.contentDocument.createElement('script');
iframe_script.textContent = `
// Test fetch() API with default "client" referrer.
fetch("${location.origin}/common/security-features/subresource/xhr.py?name=testFetchClientReferrer")
.then(r => r.json())
.then(j => {
top.postMessage({test: "testFetchClientReferrer", referrer: j.headers.referer}, "*")
}).catch(e => {
top.postMessage({test: "testFetchClientReferrer", referrer: "FAILURE"}, "*");
});
// Test fetch() API with custom URL referrer.
fetch("${location.origin}/common/security-features/subresource/xhr.py?name=URL",
{referrer: "${location.href}/custom"})
.then(r => r.json())
.then(j => {
top.postMessage({test: "testFetchURLReferrer", referrer: j.headers.referer}, "*")
}).catch(e => {
top.postMessage({test: "testFetchURLReferrer", referrer: "FAILURE"}, "*");
});
// Test document.referrer.
top.postMessage({test: "testDocumentReferrer", referrer: document.referrer}, "*");
// Test a subresource being fetched by the iframe.
const subresource_script = document.createElement('script');
subresource_script.src = "${location.origin}/common/security-features/subresource/referrer.py";
subresource_script.onload = e => {
top.postMessage({test: "testSubresource", referrer: window.referrer}, "*");
}
subresource_script.onerror = function(e) {
top.postMessage({test: "testSubresource", referrer: "FAILURE"}, "*");
};
document.head.appendChild(subresource_script);
`;
iframe.contentDocument.body.appendChild(iframe_script);
});
document.body.appendChild(iframe);
</script>
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