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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
Cu.crashIfNotInAutomation();
// Exposes the browser.test.onMessage event on web-platform.test pages.
export class WPTMessagesChild extends JSWindowActorChild {
observe() {
// Only observing "content-document-global-created" to trigger the actor.
}
actorCreated() {
let win = this.contentWindow.wrappedJSObject;
if (!Object.hasOwn(win, "browser")) {
let test = {
onMessage: {
addListener: arg => this.#addListener(arg),
removeListener: arg => this.#removeListener(arg),
},
};
Object.defineProperty(win, "browser", {
configurable: true,
enumerable: true,
value: Cu.cloneInto({ test }, win, { cloneFunctions: true }),
writable: true,
});
}
}
receiveMessage({ name, data }) {
for (let callback of this.#listeners) {
try {
callback(name, Cu.cloneInto(data, this.contentWindow));
} catch (e) {
Cu.reportError(
`Error in browser.test.onMessage listener: ${e.message}`,
e.stack
);
}
}
}
#addListener(callback) {
if (!this.#listeners.size) {
this.sendAsyncMessage("onMessage.addListener");
}
this.#listeners.add(callback);
}
#removeListener(callback) {
this.#listeners.delete(callback);
if (!this.#listeners.size) {
this.sendAsyncMessage("onMessage.removeListener");
}
}
#listeners = new Set();
}