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Allow mediaCast sender to run in background context

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hensm
2019-07-27 07:56:43 +01:00
parent 79fd72022b
commit 9e196465e5
12 changed files with 527 additions and 523 deletions
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54
ext/src/shim/export.ts
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@@ -4,11 +4,12 @@ import * as cast from "./cast";
import { BridgeInfo } from "../lib/bridge";
import { Message } from "../types";
import { onMessage } from "./eventMessageChannel";
import { onMessage, onMessageResponse, sendMessage } from "./eventMessageChannel";
let initializedBridgeInfo: BridgeInfo;
let initializedBackgroundPort: browser.runtime.Port;
let initializedBackgroundPort: MessagePort;
/**
* To support exporting an API from a module, we need to
@@ -17,7 +18,7 @@ let initializedBackgroundPort: browser.runtime.Port;
* for and emits these messages, and changing that behavior
* is too messy.
*/
export function ensureInit (): Promise<browser.runtime.Port> {
export function ensureInit (): Promise<MessagePort> {
return new Promise(async (resolve, reject) => {
// If already initialized, just return existing bridge info
@@ -31,6 +32,9 @@ export function ensureInit (): Promise<browser.runtime.Port> {
return;
}
const channel = new MessageChannel();
initializedBackgroundPort = channel.port1;
/**
* If the module is imported into a background script
* context, the location will be the internal extension URL,
@@ -38,14 +42,48 @@ export function ensureInit (): Promise<browser.runtime.Port> {
* URL.
*/
if (window.location.protocol === "moz-extension:") {
//
const { default: createShim } = await import("../createShim");
// port2 will post bridge messages to port 1
await createShim(channel.port2);
// bridge -> shim
channel.port1.onmessage = ev => {
const message = ev.data as Message;
// Send message to shim
sendMessage(message);
handleIncomingMessageToShim(message);
};
// shim -> bridge
onMessageResponse(message => {
channel.port1.postMessage(message);
});
} else {
// Trigger message port setup side-effects
/**
* Import reference to message port created by contentBridge.
* Creation of the port triggers side-effects in the
* background script.
*/
const { backgroundPort } = await import("./contentBridge");
initializedBackgroundPort = backgroundPort;
// backgroundPort -> channel.port2
backgroundPort.onMessage.addListener((message: Message) => {
channel.port2.postMessage(message);
});
// channel.port2 -> backgroundPort
channel.port2.onmessage = ev => {
const message = ev.data as Message;
backgroundPort.postMessage(message);
};
// Handle shim messages
onMessage(handleIncomingMessageToShim);
}
onMessage(message => {
function handleIncomingMessageToShim (message: Message) {
switch (message.subject) {
case "shim:/initialized": {
initializedBridgeInfo = message.data;
@@ -57,7 +95,7 @@ export function ensureInit (): Promise<browser.runtime.Port> {
}
}
}
});
}
});
}