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/*
* Copyright (C) 2021 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/>.
*/
/* global
* api
*/
/**
* This class is used to return the ancestor frame IDs for the current frame.
* This is a workaround to using the `webNavigation.getAllFrames` API, which
* would require an additional permission that is otherwise unnecessary.
*/
class FrameAncestryHandler {
/**
* Creates a new instance.
* @param frameId The frame ID of the current frame the instance is instantiated in.
*/
constructor(frameId) {
this._frameId = frameId;
this._isPrepared = false;
this._requestMessageId = 'FrameAncestryHandler.requestFrameInfo';
this._responseMessageId = `${this._requestMessageId}.response`;
}
/**
* Gets the frame ID that the instance is instantiated in.
*/
get frameId() {
return this._frameId;
}
/**
* Initializes event event listening.
*/
prepare() {
if (this._isPrepared) { return; }
window.addEventListener('message', this._onWindowMessage.bind(this), false);
this._isPrepared = true;
}
/**
* Gets the frame ancestry information for the current frame. If the frame is the
* root frame, an empty array is returned. Otherwise, an array of frame IDs is returned,
* starting from the nearest ancestor.
* @param timeout The maximum time to wait to receive a response to frame information requests.
* @returns An array of frame IDs corresponding to the ancestors of the current frame.
*/
getFrameAncestryInfo(timeout=5000) {
return new Promise((resolve, reject) => {
const targetWindow = window.parent;
if (window === targetWindow) {
resolve([]);
return;
}
const uniqueId = generateId(16);
const responseMessageId = this._responseMessageId;
const results = [];
let resultsExpectedCount = null;
let resultsCount = 0;
let timer = null;
const cleanup = () => {
if (timer !== null) {
clearTimeout(timer);
timer = null;
}
chrome.runtime.onMessage.removeListener(onMessage);
};
const onMessage = (message, sender, sendResponse) => {
// Validate message
if (
typeof message !== 'object' ||
message === null ||
message.action !== responseMessageId
) {
return;
}
const {params} = message;
if (params.uniqueId !== uniqueId) { return; } // Wrong ID
const {frameId, index, more} = params;
console.log({frameId, index, more});
if (typeof results[index] !== 'undefined') { return; } // Invalid repeat
// Add result
results[index] = frameId;
++resultsCount;
if (!more) {
resultsExpectedCount = index + 1;
}
if (resultsExpectedCount !== null && resultsCount >= resultsExpectedCount) {
// Cleanup
cleanup();
sendResponse();
// Finish
resolve(results);
} else {
resetTimeout();
}
};
const onTimeout = () => {
timer = null;
cleanup();
reject(new Error(`Request for parent frame ID timed out after ${timeout}ms`));
};
const resetTimeout = () => {
if (timer !== null) { clearTimeout(timer); }
timer = setTimeout(onTimeout, timeout);
};
// Start
chrome.runtime.onMessage.addListener(onMessage);
resetTimeout();
this._requestFrameInfo(targetWindow, uniqueId, this._frameId, 0);
});
}
// Private
_onWindowMessage(event) {
const {data} = event;
if (
typeof data === 'object' &&
data !== null &&
data.action === this._requestMessageId
) {
try {
this._onRequestFrameInfo(data.params);
} catch (e) {
// NOP
}
}
}
_onRequestFrameInfo({uniqueId, originFrameId, index}) {
if (
typeof uniqueId !== 'string' ||
typeof originFrameId !== 'number' ||
!this._isNonNegativeInteger(index)
) {
return;
}
const {parent} = window;
const more = (window !== parent);
const responseParams = {uniqueId, frameId: this._frameId, index, more};
this._safeSendMessageToFrame(originFrameId, this._responseMessageId, responseParams);
if (more) {
this._requestFrameInfo(parent, uniqueId, originFrameId, index + 1);
}
}
async _safeSendMessageToFrame(frameId, action, params) {
try {
await api.sendMessageToFrame(frameId, action, params);
} catch (e) {
// NOP
}
}
_requestFrameInfo(targetWindow, uniqueId, originFrameId, index) {
targetWindow.postMessage({
action: this._requestMessageId,
params: {uniqueId, originFrameId, index}
}, '*');
}
_isNonNegativeInteger(value) {
return (
typeof value === 'number' &&
Number.isFinite(value) &&
value >= 0 &&
Math.floor(value) === value
);
}
}
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