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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
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import { MessageHandler } from "chrome://remote/content/shared/messagehandler/MessageHandler.sys.mjs";
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+ FrameTransport:
+ "chrome://remote/content/shared/messagehandler/transports/FrameTransport.sys.mjs",
+ SessionData:
+ "chrome://remote/content/shared/messagehandler/sessiondata/SessionData.sys.mjs",
+ SessionDataMethod:
+ "chrome://remote/content/shared/messagehandler/sessiondata/SessionData.sys.mjs",
+ WindowGlobalMessageHandler:
+ "chrome://remote/content/shared/messagehandler/WindowGlobalMessageHandler.sys.mjs",
+});
+
+/**
+ * A RootMessageHandler is the root node of a MessageHandler network. It lives
+ * in the parent process. It can forward commands to MessageHandlers in other
+ * layers (at the moment WindowGlobalMessageHandlers in content processes).
+ */
+export class RootMessageHandler extends MessageHandler {
+ #frameTransport;
+ #sessionData;
+
+ /**
+ * Returns the RootMessageHandler module path.
+ *
+ * @return {String}
+ */
+ static get modulePath() {
+ return "root";
+ }
+
+ /**
+ * Returns the RootMessageHandler type.
+ *
+ * @return {String}
+ */
+ static get type() {
+ return "ROOT";
+ }
+
+ /**
+ * The ROOT MessageHandler is unique for a given MessageHandler network
+ * (ie for a given sessionId). Reuse the type as context id here.
+ */
+ static getIdFromContext(context) {
+ return RootMessageHandler.type;
+ }
+
+ /**
+ * Create a new RootMessageHandler instance.
+ *
+ * @param {String} sessionId
+ * ID of the session the handler is used for.
+ */
+ constructor(sessionId) {
+ super(sessionId, null);
+
+ this.#frameTransport = new lazy.FrameTransport(this);
+ this.#sessionData = new lazy.SessionData(this);
+ }
+
+ get sessionData() {
+ return this.#sessionData;
+ }
+
+ destroy() {
+ this.#sessionData.destroy();
+ super.destroy();
+ }
+
+ /**
+ * Add new session data items of a given module, category and
+ * contextDescriptor.
+ *
+ * Forwards the call to the SessionData instance owned by this
+ * RootMessageHandler and propagates the information via a command to existing
+ * MessageHandlers.
+ */
+ addSessionData(sessionData = {}) {
+ sessionData.method = lazy.SessionDataMethod.Add;
+ return this.updateSessionData([sessionData]);
+ }
+
+ /**
+ * Emit a public protocol event. This event will be sent over to the client.
+ *
+ * @param {String} name
+ * Name of the event. Protocol level events should be of the
+ * form [module name].[event name].
+ * @param {Object} data
+ * The event's data.
+ */
+ emitProtocolEvent(name, data) {
+ this.emit("message-handler-protocol-event", {
+ name,
+ data,
+ sessionId: this.sessionId,
+ });
+ }
+
+ /**
+ * Forward the provided command to WINDOW_GLOBAL MessageHandlers via the
+ * FrameTransport.
+ *
+ * @param {Command} command
+ * The command to forward. See type definition in MessageHandler.js
+ * @return {Promise}
+ * Returns a promise that resolves with the result of the command.
+ */
+ forwardCommand(command) {
+ switch (command.destination.type) {
+ case lazy.WindowGlobalMessageHandler.type:
+ return this.#frameTransport.forwardCommand(command);
+ default:
+ throw new Error(
+ `Cannot forward command to "${command.destination.type}" from "${this.constructor.type}".`
+ );
+ }
+ }
+
+ matchesContext() {
+ return true;
+ }
+
+ /**
+ * Remove session data items of a given module, category and
+ * contextDescriptor.
+ *
+ * Forwards the call to the SessionData instance owned by this
+ * RootMessageHandler and propagates the information via a command to existing
+ * MessageHandlers.
+ */
+ removeSessionData(sessionData = {}) {
+ sessionData.method = lazy.SessionDataMethod.Remove;
+ return this.updateSessionData([sessionData]);
+ }
+
+ /**
+ * Update session data items of a given module, category and
+ * contextDescriptor.
+ *
+ * Forwards the call to the SessionData instance owned by this
+ * RootMessageHandler.
+ */
+ async updateSessionData(sessionData = []) {
+ await this.#sessionData.updateSessionData(sessionData);
+ }
+}