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vapi-background.js
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/*******************************************************************************
uBlock Origin - a browser extension to block requests.
Copyright (C) 2014-2015 The uBlock Origin authors
Copyright (C) 2014-present Raymond Hill
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 {http://www.gnu.org/licenses/}.
Home: https://github.com/gorhill/uBlock
*/
// For background page
'use strict';
/******************************************************************************/
import webext from './webext.js';
import { ubolog } from './console.js';
/******************************************************************************/
const manifest = browser.runtime.getManifest();
vAPI.cantWebsocket =
browser.webRequest.ResourceType instanceof Object === false ||
browser.webRequest.ResourceType.WEBSOCKET !== 'websocket';
vAPI.canWASM = vAPI.webextFlavor.soup.has('chromium') === false;
if ( vAPI.canWASM === false ) {
const csp = manifest.content_security_policy;
vAPI.canWASM = csp !== undefined && csp.indexOf("'unsafe-eval'") !== -1;
}
vAPI.supportsUserStylesheets = vAPI.webextFlavor.soup.has('user_stylesheet');
// The real actual webextFlavor value may not be set in stone, so listen
// for possible future changes.
window.addEventListener('webextFlavor', function() {
vAPI.supportsUserStylesheets =
vAPI.webextFlavor.soup.has('user_stylesheet');
}, { once: true });
/******************************************************************************/
vAPI.app = {
name: manifest.name.replace(/ dev\w+ build/, ''),
version: (( ) => {
let version = manifest.version;
const match = /(\d+\.\d+\.\d+)(?:\.(\d+))?/.exec(version);
if ( match && match[2] ) {
const v = parseInt(match[2], 10);
version = match[1] + (v < 100 ? 'b' + v : 'rc' + (v - 100));
}
return version;
})(),
intFromVersion: function(s) {
const parts = s.match(/(?:^|\.|b|rc)\d+/g);
if ( parts === null ) { return 0; }
let vint = 0;
for ( let i = 0; i < 4; i++ ) {
const pstr = parts[i] || '';
let pint;
if ( pstr === '' ) {
pint = 0;
} else if ( pstr.startsWith('.') || pstr.startsWith('b') ) {
pint = parseInt(pstr.slice(1), 10);
} else if ( pstr.startsWith('rc') ) {
pint = parseInt(pstr.slice(2), 10) + 100;
} else {
pint = parseInt(pstr, 10);
}
vint = vint * 1000 + pint;
}
return vint;
},
restart: function() {
browser.runtime.reload();
},
};
/******************************************************************************/
/******************************************************************************/
vAPI.storage = webext.storage.local;
/******************************************************************************/
/******************************************************************************/
// https://github.com/gorhill/uMatrix/issues/234
// https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/privacy/network
// https://github.com/gorhill/uBlock/issues/2048
// Do not mess up with existing settings if not assigning them stricter
// values.
vAPI.browserSettings = (( ) => {
// Not all platforms support `browser.privacy`.
const bp = webext.privacy;
if ( bp instanceof Object === false ) { return; }
return {
// https://github.com/uBlockOrigin/uBlock-issues/issues/1723#issuecomment-919913361
canLeakLocalIPAddresses:
vAPI.webextFlavor.soup.has('firefox') &&
vAPI.webextFlavor.soup.has('mobile'),
set: function(details) {
for ( const setting in details ) {
if ( details.hasOwnProperty(setting) === false ) { continue; }
switch ( setting ) {
case 'prefetching':
const enabled = !!details[setting];
if ( enabled ) {
bp.network.networkPredictionEnabled.clear({
scope: 'regular',
});
} else {
bp.network.networkPredictionEnabled.set({
value: false,
scope: 'regular',
});
}
if ( vAPI.prefetching instanceof Function ) {
vAPI.prefetching(enabled);
}
break;
case 'hyperlinkAuditing':
if ( !!details[setting] ) {
bp.websites.hyperlinkAuditingEnabled.clear({
scope: 'regular',
});
} else {
bp.websites.hyperlinkAuditingEnabled.set({
value: false,
scope: 'regular',
});
}
break;
case 'webrtcIPAddress':
if ( this.canLeakLocalIPAddresses === false ) { return; }
if ( !!details[setting] ) {
bp.network.webRTCIPHandlingPolicy.clear({
scope: 'regular',
});
} else {
bp.network.webRTCIPHandlingPolicy.set({
value: 'default_public_interface_only',
scope: 'regular'
});
}
break;
default:
break;
}
}
}
};
})();
/******************************************************************************/
/******************************************************************************/
vAPI.isBehindTheSceneTabId = function(tabId) {
return tabId < 0;
};
vAPI.unsetTabId = 0;
vAPI.noTabId = -1; // definitely not any existing tab
// To ensure we always use a good tab id
const toTabId = function(tabId) {
return typeof tabId === 'number' && isNaN(tabId) === false
? tabId
: 0;
};
// https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webNavigation
// https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/tabs
vAPI.Tabs = class {
constructor() {
browser.webNavigation.onCreatedNavigationTarget.addListener(details => {
this.onCreatedNavigationTargetHandler(details);
});
browser.webNavigation.onCommitted.addListener(details => {
this.onCommittedHandler(details);
});
browser.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
this.onUpdatedHandler(tabId, changeInfo, tab);
});
browser.tabs.onActivated.addListener(details => {
this.onActivated(details);
});
// https://github.com/uBlockOrigin/uBlock-issues/issues/151
// https://github.com/uBlockOrigin/uBlock-issues/issues/680#issuecomment-515215220
if ( browser.windows instanceof Object ) {
browser.windows.onFocusChanged.addListener(windowId => {
this.onFocusChangedHandler(windowId);
});
}
browser.tabs.onRemoved.addListener((tabId, details) => {
this.onRemovedHandler(tabId, details);
});
}
async executeScript() {
let result;
try {
result = await webext.tabs.executeScript(...arguments);
}
catch(reason) {
}
return Array.isArray(result) ? result : [];
}
async get(tabId) {
if ( tabId === null ) {
return this.getCurrent();
}
if ( tabId <= 0 ) { return null; }
let tab;
try {
tab = await webext.tabs.get(tabId);
}
catch(reason) {
}
return tab instanceof Object ? tab : null;
}
async getCurrent() {
const tabs = await this.query({ active: true, currentWindow: true });
return tabs.length !== 0 ? tabs[0] : null;
}
async insertCSS(tabId, details) {
if ( vAPI.supportsUserStylesheets ) {
details.cssOrigin = 'user';
}
try {
await webext.tabs.insertCSS(...arguments);
}
catch(reason) {
}
}
async query(queryInfo) {
let tabs;
try {
tabs = await webext.tabs.query(queryInfo);
}
catch(reason) {
}
return Array.isArray(tabs) ? tabs : [];
}
async removeCSS(tabId, details) {
if ( vAPI.supportsUserStylesheets ) {
details.cssOrigin = 'user';
}
try {
await webext.tabs.removeCSS(...arguments);
}
catch(reason) {
}
}
// Properties of the details object:
// - url: 'URL', => the address that will be opened
// - index: -1, => undefined: end of the list, -1: following tab,
// or after index
// - active: false, => opens the tab... in background: true,
// foreground: undefined
// - popup: 'popup' => open in a new window
async create(url, details) {
if ( details.active === undefined ) {
details.active = true;
}
const subWrapper = async ( ) => {
const updateDetails = {
url: url,
active: !!details.active
};
// Opening a tab from incognito window won't focus the window
// in which the tab was opened
const focusWindow = tab => {
if ( tab.active && vAPI.windows instanceof Object ) {
vAPI.windows.update(tab.windowId, { focused: true });
}
};
if ( !details.tabId ) {
if ( details.index !== undefined ) {
updateDetails.index = details.index;
}
browser.tabs.create(updateDetails, focusWindow);
return;
}
// update doesn't accept index, must use move
const tab = await vAPI.tabs.update(
toTabId(details.tabId),
updateDetails
);
// if the tab doesn't exist
if ( tab === null ) {
browser.tabs.create(updateDetails, focusWindow);
} else if ( details.index !== undefined ) {
browser.tabs.move(tab.id, { index: details.index });
}
};
// Open in a standalone window
//
// https://github.com/uBlockOrigin/uBlock-issues/issues/168#issuecomment-413038191
// Not all platforms support vAPI.windows.
//
// For some reasons, some platforms do not honor the left,top
// position when specified. I found that further calling
// windows.update again with the same position _may_ help.
if ( details.popup !== undefined && vAPI.windows instanceof Object ) {
const createDetails = {
url: details.url,
type: details.popup,
};
if ( details.box instanceof Object ) {
Object.assign(createDetails, details.box);
}
const win = await vAPI.windows.create(createDetails);
if ( win === null ) { return; }
if ( details.box instanceof Object === false ) { return; }
if (
win.left === details.box.left &&
win.top === details.box.top
) {
return;
}
vAPI.windows.update(win.id, {
left: details.box.left,
top: details.box.top
});
return;
}
if ( details.index !== -1 ) {
subWrapper();
return;
}
const tab = await vAPI.tabs.getCurrent();
if ( tab !== null ) {
details.index = tab.index + 1;
} else {
details.index = undefined;
}
subWrapper();
}
// Properties of the details object:
// - url: 'URL', => the address that will be opened
// - tabId: 1, => the tab is used if set, instead of creating a new one
// - index: -1, => undefined: end of the list, -1: following tab, or
// after index
// - active: false, => opens the tab in background - true and undefined:
// foreground
// - select: true, => if a tab is already opened with that url, then select
// it instead of opening a new one
// - popup: true => open in a new window
async open(details) {
let targetURL = details.url;
if ( typeof targetURL !== 'string' || targetURL === '' ) {
return null;
}
// extension pages
if ( /^[\w-]{2,}:/.test(targetURL) !== true ) {
targetURL = vAPI.getURL(targetURL);
}
if ( !details.select ) {
this.create(targetURL, details);
return;
}
// https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/tabs/query#Parameters
// "Note that fragment identifiers are not matched."
// Fragment identifiers ARE matched -- we need to remove the fragment.
const pos = targetURL.indexOf('#');
const targetURLWithoutHash = pos === -1
? targetURL
: targetURL.slice(0, pos);
const tabs = await vAPI.tabs.query({ url: targetURLWithoutHash });
if ( tabs.length === 0 ) {
this.create(targetURL, details);
return;
}
let tab = tabs[0];
const updateDetails = { active: true };
// https://github.com/uBlockOrigin/uBlock-issues/issues/592
if ( tab.url.startsWith(targetURL) === false ) {
updateDetails.url = targetURL;
}
tab = await vAPI.tabs.update(tab.id, updateDetails);
if ( vAPI.windows instanceof Object === false ) { return; }
vAPI.windows.update(tab.windowId, { focused: true });
}
async update() {
let tab;
try {
tab = await webext.tabs.update(...arguments);
}
catch (reason) {
}
return tab instanceof Object ? tab : null;
}
// Replace the URL of a tab. Noop if the tab does not exist.
replace(tabId, url) {
tabId = toTabId(tabId);
if ( tabId === 0 ) { return; }
let targetURL = url;
// extension pages
if ( /^[\w-]{2,}:/.test(targetURL) !== true ) {
targetURL = vAPI.getURL(targetURL);
}
vAPI.tabs.update(tabId, { url: targetURL });
}
async remove(tabId) {
tabId = toTabId(tabId);
if ( tabId === 0 ) { return; }
try {
await webext.tabs.remove(tabId);
}
catch (reason) {
}
}
async reload(tabId, bypassCache = false) {
tabId = toTabId(tabId);
if ( tabId === 0 ) { return; }
try {
await webext.tabs.reload(
tabId,
{ bypassCache: bypassCache === true }
);
}
catch (reason) {
}
}
async select(tabId) {
tabId = toTabId(tabId);
if ( tabId === 0 ) { return; }
const tab = await vAPI.tabs.update(tabId, { active: true });
if ( tab === null ) { return; }
if ( vAPI.windows instanceof Object === false ) { return; }
vAPI.windows.update(tab.windowId, { focused: true });
}
// https://forums.lanik.us/viewtopic.php?f=62&t=32826
// Chromium-based browsers: sanitize target URL. I've seen data: URI with
// newline characters in standard fields, possibly as a way of evading
// filters. As per spec, there should be no whitespaces in a data: URI's
// standard fields.
sanitizeURL(url) {
if ( url.startsWith('data:') === false ) { return url; }
const pos = url.indexOf(',');
if ( pos === -1 ) { return url; }
const s = url.slice(0, pos);
if ( s.search(/\s/) === -1 ) { return url; }
return s.replace(/\s+/, '') + url.slice(pos);
}
onCreatedNavigationTargetHandler(details) {
if ( typeof details.url !== 'string' ) {
details.url = '';
}
if ( /^https?:\/\//.test(details.url) === false ) {
details.frameId = 0;
details.url = this.sanitizeURL(details.url);
this.onNavigation(details);
}
this.onCreated(details);
}
onCommittedHandler(details) {
details.url = this.sanitizeURL(details.url);
this.onNavigation(details);
}
onUpdatedHandler(tabId, changeInfo, tab) {
// Ignore uninteresting update events
const { status = '', title = '', url = '' } = changeInfo;
if ( status === '' && title === '' && url === '' ) { return; }
// https://github.com/gorhill/uBlock/issues/3073
// Fall back to `tab.url` when `changeInfo.url` is not set.
if ( url === '' ) {
changeInfo.url = tab && tab.url;
}
if ( changeInfo.url ) {
changeInfo.url = this.sanitizeURL(changeInfo.url);
}
this.onUpdated(tabId, changeInfo, tab);
}
onRemovedHandler(tabId, details) {
this.onClosed(tabId, details);
}
onFocusChangedHandler(windowId) {
if ( windowId === browser.windows.WINDOW_ID_NONE ) { return; }
vAPI.tabs.query({ active: true, windowId }).then(tabs => {
if ( tabs.length === 0 ) { return; }
const tab = tabs[0];
this.onActivated({ tabId: tab.id, windowId: tab.windowId });
});
}
onActivated(/* details */) {
}
onClosed(/* tabId, details */) {
}
onCreated(/* details */) {
}
onNavigation(/* details */) {
}
onUpdated(/* tabId, changeInfo, tab */) {
}
};
/******************************************************************************/
/******************************************************************************/
if ( webext.windows instanceof Object ) {
vAPI.windows = {
get: async function() {
let win;
try {
win = await webext.windows.get(...arguments);
}
catch (reason) {
}
return win instanceof Object ? win : null;
},
create: async function() {
let win;
try {
win = await webext.windows.create(...arguments);
}
catch (reason) {
}
return win instanceof Object ? win : null;
},
update: async function() {
let win;
try {
win = await webext.windows.update(...arguments);
}
catch (reason) {
}
return win instanceof Object ? win : null;
},
};
}
/******************************************************************************/
/******************************************************************************/
if ( webext.browserAction instanceof Object ) {
vAPI.browserAction = {
setTitle: async function() {
try {
await webext.browserAction.setTitle(...arguments);
}
catch (reason) {
}
},
};
// Not supported on Firefox for Android
if ( webext.browserAction.setIcon ) {
vAPI.browserAction.setBadgeTextColor = async function() {
try {
await webext.browserAction.setBadgeTextColor(...arguments);
}
catch (reason) {
}
};
vAPI.browserAction.setBadgeBackgroundColor = async function() {
try {
await webext.browserAction.setBadgeBackgroundColor(...arguments);
}
catch (reason) {
}
};
vAPI.browserAction.setBadgeText = async function() {
try {
await webext.browserAction.setBadgeText(...arguments);
}
catch (reason) {
}
};
vAPI.browserAction.setIcon = async function() {
try {
await webext.browserAction.setIcon(...arguments);
}
catch (reason) {
}
};
}
}
/******************************************************************************/
/******************************************************************************/
// Must read: https://code.google.com/p/chromium/issues/detail?id=410868#c8
// https://github.com/chrisaljoudi/uBlock/issues/19
// https://github.com/chrisaljoudi/uBlock/issues/207
// Since we may be called asynchronously, the tab id may not exist
// anymore, so this ensures it does still exist.
// https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/browserAction#Browser_compatibility
// Firefox for Android does no support browser.browserAction.setIcon().
// Performance: use ImageData for platforms supporting it.
// https://github.com/uBlockOrigin/uBlock-issues/issues/32
// Ensure ImageData for toolbar icon is valid before use.
vAPI.setIcon = (( ) => {
const browserAction = vAPI.browserAction;
const titleTemplate =
browser.runtime.getManifest().browser_action.default_title +
' ({badge})';
const icons = [
{ path: { '16': 'img/icon_16-off.png', '32': 'img/icon_32-off.png' } },
{ path: { '16': 'img/icon_16.png', '32': 'img/icon_32.png' } },
];
(( ) => {
if ( browserAction.setIcon === undefined ) { return; }
// The global badge text and background color.
if ( browserAction.setBadgeBackgroundColor !== undefined ) {
browserAction.setBadgeBackgroundColor({ color: '#666666' });
}
if ( browserAction.setBadgeTextColor !== undefined ) {
browserAction.setBadgeTextColor({ color: '#FFFFFF' });
}
// As of 2018-05, benchmarks show that only Chromium benefits for sure
// from using ImageData.
//
// Chromium creates a new ImageData instance every call to setIcon
// with paths:
// https://cs.chromium.org/chromium/src/extensions/renderer/resources/set_icon.js?l=56&rcl=99be185c25738437ecfa0dafba72a26114196631
//
// Firefox uses an internal cache for each setIcon's paths:
// https://searchfox.org/mozilla-central/rev/5ff2d7683078c96e4b11b8a13674daded935aa44/browser/components/extensions/parent/ext-browserAction.js#631
if ( vAPI.webextFlavor.soup.has('chromium') === false ) { return; }
const imgs = [];
for ( let i = 0; i < icons.length; i++ ) {
const path = icons[i].path;
for ( const key in path ) {
if ( path.hasOwnProperty(key) === false ) { continue; }
imgs.push({ i: i, p: key });
}
}
// https://github.com/uBlockOrigin/uBlock-issues/issues/296
const safeGetImageData = function(ctx, w, h) {
let data;
try {
data = ctx.getImageData(0, 0, w, h);
} catch(ex) {
}
return data;
};
const onLoaded = function() {
for ( const img of imgs ) {
if ( img.r.complete === false ) { return; }
}
const ctx = document.createElement('canvas').getContext('2d');
const iconData = [ null, null ];
for ( const img of imgs ) {
const w = img.r.naturalWidth, h = img.r.naturalHeight;
ctx.width = w; ctx.height = h;
ctx.clearRect(0, 0, w, h);
ctx.drawImage(img.r, 0, 0);
if ( iconData[img.i] === null ) { iconData[img.i] = {}; }
const imgData = safeGetImageData(ctx, w, h);
if (
imgData instanceof Object === false ||
imgData.data instanceof Uint8ClampedArray === false ||
imgData.data[0] !== 0 ||
imgData.data[1] !== 0 ||
imgData.data[2] !== 0 ||
imgData.data[3] !== 0
) {
return;
}
iconData[img.i][img.p] = imgData;
}
for ( let i = 0; i < iconData.length; i++ ) {
if ( iconData[i] ) {
icons[i] = { imageData: iconData[i] };
}
}
};
for ( const img of imgs ) {
img.r = new Image();
img.r.addEventListener('load', onLoaded, { once: true });
img.r.src = icons[img.i].path[img.p];
}
})();
// parts: bit 0 = icon
// bit 1 = badge text
// bit 2 = badge color
// bit 3 = hide badge
return async function(tabId, details) {
tabId = toTabId(tabId);
if ( tabId === 0 ) { return; }
const tab = await vAPI.tabs.get(tabId);
if ( tab === null ) { return; }
const { parts, state, badge, color } = details;
if ( browserAction.setIcon !== undefined ) {
if ( parts === undefined || (parts & 0b0001) !== 0 ) {
browserAction.setIcon(
Object.assign({ tabId: tab.id }, icons[state])
);
}
if ( (parts & 0b0010) !== 0 ) {
browserAction.setBadgeText({
tabId: tab.id,
text: (parts & 0b1000) === 0 ? badge : ''
});
}
if ( (parts & 0b0100) !== 0 ) {
browserAction.setBadgeBackgroundColor({ tabId: tab.id, color });
}
}
// Insert the badge text in the title if:
// - the platform does not support browserAction.setIcon(); OR
// - the rendering of the badge is disabled
if (
browserAction.setTitle !== undefined && (
browserAction.setIcon === undefined || (parts & 0b1000) !== 0
)
) {
browserAction.setTitle({
tabId: tab.id,
title: titleTemplate.replace(
'{badge}',
state === 1 ? (badge !== '' ? badge : '0') : 'off'
)
});
}
if ( vAPI.contextMenu instanceof Object ) {
vAPI.contextMenu.onMustUpdate(tabId);
}
};
})();
browser.browserAction.onClicked.addListener(function(tab) {
vAPI.tabs.open({
select: true,
url: 'popup.html?tabId=' + tab.id + '&responsive=1'
});
});
/******************************************************************************/
/******************************************************************************/
// https://github.com/uBlockOrigin/uBlock-issues/issues/710
// uBO uses only ports to communicate with its auxiliary pages and
// content scripts. Whether a message can trigger a privileged operation is
// decided based on whether the port from which a message is received is
// privileged, which is a status evaluated once, at port connection time.
vAPI.messaging = {
ports: new Map(),
listeners: new Map(),
defaultHandler: null,
PRIVILEGED_URL: vAPI.getURL(''),
NOOPFUNC: function(){},
UNHANDLED: 'vAPI.messaging.notHandled',
listen: function(details) {
this.listeners.set(details.name, {
fn: details.listener,
privileged: details.privileged === true
});
},
onPortDisconnect: function(port) {
this.ports.delete(port.name);
},
// https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/runtime/Port
// port.sender is always present for onConnect() listeners.
onPortConnect: function(port) {
port.onDisconnect.addListener(port =>
this.onPortDisconnect(port)
);
port.onMessage.addListener((request, port) =>
this.onPortMessage(request, port)
);
const portDetails = { port };
const sender = port.sender;
const { tab, url } = sender;
portDetails.frameId = sender.frameId;
portDetails.frameURL = url;
portDetails.privileged = url.startsWith(this.PRIVILEGED_URL);
if ( tab ) {
portDetails.tabId = tab.id;
portDetails.tabURL = tab.url;
}
this.ports.set(port.name, portDetails);
// https://bugzilla.mozilla.org/show_bug.cgi?id=1652925#c24
port.sender = undefined;
},
setup: function(defaultHandler) {
if ( this.defaultHandler !== null ) { return; }
if ( typeof defaultHandler !== 'function' ) {
defaultHandler = function() {
return this.UNHANDLED;
};
}
this.defaultHandler = defaultHandler;
browser.runtime.onConnect.addListener(
port => this.onPortConnect(port)
);
// https://bugzilla.mozilla.org/show_bug.cgi?id=1392067
// Workaround: manually remove ports matching removed tab.
if (
vAPI.webextFlavor.soup.has('firefox') &&
vAPI.webextFlavor.major < 61
) {
browser.tabs.onRemoved.addListener(tabId => {
for ( const { port, tabId: portTabId } of this.ports.values() ) {
if ( portTabId !== tabId ) { continue; }
this.onPortDisconnect(port);
}
});
}
},
broadcast: function(message) {
const messageWrapper = { broadcast: true, msg: message };
for ( const { port } of this.ports.values() ) {
try {
port.postMessage(messageWrapper);
} catch(ex) {
this.onPortDisconnect(port);
}
}
},
onFrameworkMessage: function(request, port, callback) {
const portDetails = this.ports.get(port.name) || {};
const tabId = portDetails.tabId;
const msg = request.msg;
switch ( msg.what ) {
case 'connectionAccepted':
case 'connectionRefused': {
const toPort = this.ports.get(msg.fromToken);
if ( toPort !== undefined ) {
msg.tabId = tabId;
toPort.port.postMessage(request);
} else {
msg.what = 'connectionBroken';
port.postMessage(request);
}
break;
}
case 'connectionRequested':
msg.tabId = tabId;
for ( const { port: toPort } of this.ports.values() ) {
if ( toPort === port ) { continue; }
try {
toPort.postMessage(request);
} catch (ex) {
this.onPortDisconnect(toPort);
}
}
break;
case 'connectionBroken':
case 'connectionCheck':
case 'connectionMessage': {
const toPort = this.ports.get(
port.name === msg.fromToken ? msg.toToken : msg.fromToken
);
if ( toPort !== undefined ) {
msg.tabId = tabId;
toPort.port.postMessage(request);
} else {
msg.what = 'connectionBroken';
port.postMessage(request);
}
break;
}
case 'extendClient':
vAPI.tabs.executeScript(tabId, {
file: '/js/vapi-client-extra.js',
frameId: portDetails.frameId,
}).then(( ) => {
callback();
});
break;
case 'localStorage': {
if ( portDetails.privileged !== true ) { break; }
const args = msg.args || [];
vAPI.localStorage[msg.fn](...args).then(result => {
callback(result);
});
break;
}
case 'userCSS':
if ( tabId === undefined ) { break; }
const promises = [];
if ( msg.add ) {
const details = {
code: undefined,
frameId: portDetails.frameId,
matchAboutBlank: true,
runAt: 'document_start',
};
for ( const cssText of msg.add ) {
details.code = cssText;
promises.push(vAPI.tabs.insertCSS(tabId, details));
}
}
if ( msg.remove ) {
const details = {
code: undefined,
frameId: portDetails.frameId,
matchAboutBlank: true,
};
for ( const cssText of msg.remove ) {
details.code = cssText;
promises.push(vAPI.tabs.removeCSS(tabId, details));
}
}
Promise.all(promises).then(( ) => {
callback();
});
break;
}
},
// Use a wrapper to avoid closure and to allow reuse.
CallbackWrapper: class {
constructor(messaging, port, msgId) {
this.messaging = messaging;
this.callback = this.proxy.bind(this); // bind once
this.init(port, msgId);
}