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/*
* Copyright (C) 2020-2022 Yomichan Authors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
class FrameClient {
constructor() {
this._secret = null;
this._token = null;
this._frameId = null;
}
get frameId() {
return this._frameId;
}
async connect(frame, targetOrigin, hostFrameId, setupFrame, timeout=10000) {
const {secret, token, frameId} = await this._connectIternal(frame, targetOrigin, hostFrameId, setupFrame, timeout);
this._secret = secret;
this._token = token;
this._frameId = frameId;
}
isConnected() {
return (this._secret !== null);
}
createMessage(data) {
if (!this.isConnected()) {
throw new Error('Not connected');
}
return {
token: this._token,
secret: this._secret,
data
};
}
_connectIternal(frame, targetOrigin, hostFrameId, setupFrame, timeout) {
return new Promise((resolve, reject) => {
const tokenMap = new Map();
let timer = null;
let {
promise: frameLoadedPromise,
resolve: frameLoadedResolve,
reject: frameLoadedReject
} = deferPromise();
const postMessage = (action, params) => {
const contentWindow = frame.contentWindow;
if (contentWindow === null) { throw new Error('Frame missing content window'); }
let validOrigin = true;
try {
validOrigin = (contentWindow.location.origin === targetOrigin);
} catch (e) {
// NOP
}
if (!validOrigin) { throw new Error('Unexpected frame origin'); }
contentWindow.postMessage({action, params}, targetOrigin);
};
const onMessage = (message) => {
onMessageInner(message);
return false;
};
const onMessageInner = async (message) => {
try {
if (!isObject(message)) { return; }
const {action, params} = message;
if (!isObject(params)) { return; }
await frameLoadedPromise;
if (timer === null) { return; } // Done
switch (action) {
case 'frameEndpointReady':
{
const {secret} = params;
const token = generateId(16);
tokenMap.set(secret, token);
postMessage('frameEndpointConnect', {secret, token, hostFrameId});
}
break;
case 'frameEndpointConnected':
{
const {secret, token} = params;
const frameId = message.frameId;
const token2 = tokenMap.get(secret);
if (typeof token2 !== 'undefined' && token === token2) {
cleanup();
resolve({secret, token, frameId});
}
}
break;
}
} catch (e) {
cleanup();
reject(e);
}
};
const onLoad = () => {
if (frameLoadedResolve === null) {
cleanup();
reject(new Error('Unexpected load event'));
return;
}
if (FrameClient.isFrameAboutBlank(frame)) {
return;
}
frameLoadedResolve();
frameLoadedResolve = null;
frameLoadedReject = null;
};
const cleanup = () => {
if (timer === null) { return; } // Done
clearTimeout(timer);
timer = null;
frameLoadedResolve = null;
if (frameLoadedReject !== null) {
frameLoadedReject(new Error('Terminated'));
frameLoadedReject = null;
}
chrome.runtime.onMessage.removeListener(onMessage);
frame.removeEventListener('load', onLoad);
};
// Start
timer = setTimeout(() => {
cleanup();
reject(new Error('Timeout'));
}, timeout);
chrome.runtime.onMessage.addListener(onMessage);
frame.addEventListener('load', onLoad);
// Prevent unhandled rejections
frameLoadedPromise.catch(() => {}); // NOP
try {
setupFrame(frame);
} catch (e) {
cleanup();
reject(e);
}
});
}
static isFrameAboutBlank(frame) {
try {
const contentDocument = frame.contentDocument;
if (contentDocument === null) { return false; }
const url = contentDocument.location.href;
return /^about:blank(?:[#?]|$)/.test(url);
} catch (e) {
return false;
}
}
}
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