55 lines
2.1 KiB
JavaScript
55 lines
2.1 KiB
JavaScript
// Returns a Promise that gets resolved with `event.data` when `window` receives from `source` a
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// "message" event whose `event.data.type` matches the string `message_data_type`.
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function getMessageData(message_data_type, source) {
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return new Promise(resolve => {
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function waitAndRemove(e) {
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if (e.source != source || !e.data || e.data.type != message_data_type)
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return;
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window.removeEventListener("message", waitAndRemove);
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resolve(e.data);
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}
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window.addEventListener("message", waitAndRemove);
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});
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}
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// A helper that simulates user activation on the current frame if `activate` is true, then posts
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// `message` to `frame` with the target `origin` and specified `capability` to delegate. This helper
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// awaits and returns a Promise fulfilled with the result message sent in reply from `frame`.
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// However, if the `postMessage` call fails, the helper returns a Promise rejected with the
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// exception.
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async function postCapabilityDelegationMessage(frame, message, origin, capability, activate) {
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let result_promise = getMessageData("result", frame);
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if (activate)
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await test_driver.bless();
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let postMessageOptions = {targetOrigin: origin};
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if (capability)
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postMessageOptions["delegate"] = capability;
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try {
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frame.postMessage(message, postMessageOptions);
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} catch (exception) {
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return Promise.reject(exception);
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}
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return await result_promise;
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}
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// Returns the name of a capability for which `postMessage` delegation is supported by the user
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// agent, or undefined if no such capability is found.
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async function findOneCapabilitySupportingDelegation() {
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const capabilities = ["fullscreen", "payment", "display-capture"];
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for (let i = 0; i < capabilities.length; i++) {
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try {
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await postCapabilityDelegationMessage(window, "any_message", "/", capabilities[i], false);
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assert_unreached();
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} catch (exception) {
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if (exception.name != "NotSupportedError")
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return capabilities[i];
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// Ignore all other exceptions to continue searching through the list.
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}
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};
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return undefined;
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}
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