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<script>
function assert(cond, msg) {
console.assert(cond, msg);
if (!cond) {
(window.opener || window.parent).postMessage({ type: 'error', msg }, '*');
throw new Error(msg);
}
}
function assert_if(when, cond, msg) {
if (when) assert(cond, msg);
}
addEventListener("load", () => {
const params = new URLSearchParams(location.search);
const testId = params.get("testId");
const type = params.get("type");
const method = params.get("method") || 'load';
const childHost = params.get("childHost") || location.host;
assert(type == 'popup' || type == 'iframe', 'type must be popup or iframe');
assert(method == 'write' || method == 'load', 'method must be write or load');
assert(testId != null && !isNaN(testId), 'must provide testId');
assert_if(method == 'write', !params.get("childHost"), 'childHost does not apply for method=write');
childURL.host = childHost;
if (method == 'write') {
childURL = new URL('about:blank');
}
let childWindow;
if (type == 'popup') {
childWindow = window.open(childURL);
} else if (type == 'iframe') {
const iframe = document.createElement("iframe");
iframe.src = childURL;
document.body.append(iframe);
childWindow = iframe.contentWindow;
}
childWindow.x = testId;
if (method == 'write') {
try {
childWindow.document.write(`
<script>
const testNum = decodeURIComponent(window.location.search.substring(1));
(window.opener || window.parent).postMessage("${testId} - " + window.x, "*");
window.close();
</scr`+`ipt>
`)
} catch (e) {
if (e.name != "SecurityError" || e.code != 18) {
assert(false, `Unknown error ${e.name}: ${e.message}`);
}
// Security error on cross-site write() is fine
childWindow.close();
}
}
})
addEventListener("message", ({ data }) => {
// forward further to test
(window.opener || window.parent).postMessage(data, "*");
// We expect to be done once we received a message
window.close();
})
</script>