commit 35500fb44b1b5f4cc4ac722ccca66253d13f80c1 Author: Alex Catarineu acat@torproject.org Date: Sun Aug 2 19:12:25 2020 +0200

Bug 40069: Add helpers for message passing with extensions --- toolkit/components/extensions/ExtensionParent.jsm | 47 +++++++++++++++++++++++ 1 file changed, 47 insertions(+)

diff --git a/toolkit/components/extensions/ExtensionParent.jsm b/toolkit/components/extensions/ExtensionParent.jsm index e12ee5478403..a662b62c277f 100644 --- a/toolkit/components/extensions/ExtensionParent.jsm +++ b/toolkit/components/extensions/ExtensionParent.jsm @@ -264,6 +264,8 @@ const ProxyMessenger = { /** @type Map<number, ParentPort> */ ports: new Map(),

+ _torRuntimeMessageListeners: [], + init() { this.conduit = new BroadcastConduit(ProxyMessenger, { id: "ProxyMessenger", @@ -326,6 +328,10 @@ const ProxyMessenger = { },

async recvRuntimeMessage(arg, { sender }) { + // We need to listen to some extension messages in Tor Browser + for (const listener of this._torRuntimeMessageListeners) { + listener(arg); + } arg.firstResponse = true; let kind = await this.normalizeArgs(arg, sender); let result = await this.conduit.castRuntimeMessage(kind, arg); @@ -1880,6 +1886,45 @@ for (let name of StartupCache.STORE_NAMES) { StartupCache[name] = new CacheStore(name); }

+async function torSendExtensionMessage(extensionId, message) { + // This should broadcast the message to all children "conduits" + // listening for a "RuntimeMessage". Those children conduits + // will either be extension background pages or other extension + // pages listening to browser.runtime.onMessage. + const result = await ProxyMessenger.conduit.castRuntimeMessage("messenger", { + extensionId, + holder: new StructuredCloneHolder(message), + firstResponse: true, + sender: { + id: extensionId, + envType: "addon_child", + }, + }); + return result + ? result.value + : Promise.reject({ message: ERROR_NO_RECEIVERS }); +} + +async function torWaitForExtensionMessage(extensionId, checker) { + return new Promise(resolve => { + const msgListener = msg => { + try { + if (msg && msg.extensionId === extensionId) { + const deserialized = msg.holder.deserialize({}); + if (checker(deserialized)) { + const idx = ProxyMessenger._torRuntimeMessageListeners.indexOf( + msgListener + ); + ProxyMessenger._torRuntimeMessageListeners.splice(idx, 1); + resolve(deserialized); + } + } + } catch (e) {} + }; + ProxyMessenger._torRuntimeMessageListeners.push(msgListener); + }); +} + var ExtensionParent = { GlobalManager, HiddenExtensionPage, @@ -1891,6 +1936,8 @@ var ExtensionParent = { promiseExtensionViewLoaded, watchExtensionProxyContextLoad, DebugUtils, + torSendExtensionMessage, + torWaitForExtensionMessage, };

// browserPaintedPromise and browserStartupPromise are promises that