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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* 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/. */
var EXPORTED_SYMBOLS = ["WebChannelParent"];
const { WebChannelBroker } = ChromeUtils.importESModule(
"resource://gre/modules/WebChannel.sys.mjs"
);
const ERRNO_MISSING_PRINCIPAL = 1;
const ERRNO_NO_SUCH_CHANNEL = 2;
class WebChannelParent extends JSWindowActorParent {
receiveMessage(msg) {
let data = msg.data.contentData;
let sendingContext = {
browsingContext: this.browsingContext,
browser: this.browsingContext.top.embedderElement,
eventTarget: msg.data.eventTarget,
principal: msg.data.principal,
};
// data must be a string except for a few legacy origins allowed by browser-content.js.
if (typeof data == "string") {
try {
data = JSON.parse(data);
} catch (e) {
Cu.reportError("Failed to parse WebChannel data as a JSON object");
return;
}
}
if (data && data.id) {
if (!msg.data.principal) {
this._sendErrorEventToContent(
data.id,
sendingContext,
ERRNO_MISSING_PRINCIPAL,
"Message principal missing"
);
} else {
let validChannelFound = WebChannelBroker.tryToDeliver(
data,
sendingContext
);
// if no valid origins send an event that there is no such valid channel
if (!validChannelFound) {
this._sendErrorEventToContent(
data.id,
sendingContext,
ERRNO_NO_SUCH_CHANNEL,
"No Such Channel"
);
}
}
} else {
Cu.reportError("WebChannel channel id missing");
}
}
/**
*
* @param id {String}
* The WebChannel id to include in the message
* @param sendingContext {Object}
* Message sending context
* @param [errorMsg] {String}
* Error message
* @private
*/
_sendErrorEventToContent(id, sendingContext, errorNo, errorMsg) {
let { eventTarget, principal } = sendingContext;
errorMsg = errorMsg || "Web Channel Parent error";
let { currentWindowGlobal = null } = this.browsingContext;
if (currentWindowGlobal) {
currentWindowGlobal
.getActor("WebChannel")
.sendAsyncMessage("WebChannelMessageToContent", {
id,
message: {
errno: errorNo,
error: errorMsg,
},
eventTarget,
principal,
});
} else {
Cu.reportError("Failed to send a WebChannel error. Target invalid.");
}
Cu.reportError(id.toString() + " error message. " + errorMsg);
}
}
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