wpt/html/browsers/origin/origin-keyed-agent-clusters/getter-special-cases/two-sandboxed-iframes.https.html at 2f335b8cc20209b09de4111623b61daf4d38ec87 · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Two sandboxed iframes are in different agent clusters</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div id="log"></div>

<script type="module">
// Each sandboxed iframe (without allow-same-origin) gets a unique opaque
// origin and so should be in its own agent cluster. Sending a
// WebAssembly.Module from one sandboxed iframe to another should therefore
// fire messageerror, not a successful message event.

const helperSrcdoc = `
  <script>
    addEventListener("message", e => {
      if (e.data && e.data.cmd === "send-wasm") {
        const wasm = new WebAssembly.Module(new Uint8Array([0,97,115,109,1,0,0,0]));
        parent.frames[e.data.targetIndex].postMessage(wasm, "*");
        return;
      }
      if (e.data instanceof WebAssembly.Module) {
        parent.postMessage({ result: "message" }, "*");
      }
    });
    addEventListener("messageerror", () => {
      parent.postMessage({ result: "messageerror" }, "*");
    });
  <\/script>
`;

function insertSandboxedIframe() {
  const iframe = document.createElement("iframe");
  iframe.sandbox = "allow-scripts";
  iframe.srcdoc = helperSrcdoc;
  const loaded = new Promise(resolve => iframe.addEventListener("load", resolve));
  document.body.append(iframe);
  return loaded.then(() => iframe);
}

function nextResult() {
  return new Promise(resolve => {
    addEventListener("message", e => {
      if (e.data && e.data.result)
        resolve(e.data.result);
    }, { once: true });
  });
}

promise_test(async () => {
  const iframe1 = await insertSandboxedIframe();
  await insertSandboxedIframe();

  const result = nextResult();
  iframe1.contentWindow.postMessage({ cmd: "send-wasm", targetIndex: 1 }, "*");
  assert_equals(await result, "messageerror");
}, "Sending a WebAssembly.Module between two sandboxed iframes must fire messageerror");
</script>