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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
/**
* Bug 1226498 - Shim Facebook SDK
*
* The Facebook SDK is commonly used by sites to allow users to authenticate
* for logins, but it is blocked by strict tracking protection. It is possible
* to shim the SDK and allow users to still opt into logging in via Facebook.
* It is also possible to replace any Facebook widgets or comments with
* placeholders that the user may click to opt into loading the content.
*/
if (!window.FB) {
const originalUrl = document.currentScript.src;
const pendingParses = [];
function getGUID() {
return (
Math.random()
.toString(36)
.substring(2) + Date.now().toString(36)
);
}
const shimId = "FacebookSDK";
const sendMessageToAddon = (function() {
const pendingMessages = new Map();
const channel = new MessageChannel();
channel.port1.onerror = console.error;
channel.port1.onmessage = event => {
const { messageId, response } = event.data;
const resolve = pendingMessages.get(messageId);
if (resolve) {
pendingMessages.delete(messageId);
resolve(response);
}
};
function reconnect() {
const detail = {
pendingMessages: [...pendingMessages.values()],
port: channel.port2,
shimId,
};
window.dispatchEvent(new CustomEvent("ShimConnects", { detail }));
}
window.addEventListener("ShimHelperReady", reconnect);
reconnect();
return function(message) {
const messageId = getGUID();
return new Promise(resolve => {
const payload = {
message,
messageId,
shimId,
};
pendingMessages.set(messageId, resolve);
channel.port1.postMessage(payload);
});
};
})();
let ready = false;
let initInfo;
const needPopup =
!/app_runner/.test(window.name) && !/iframe_canvas/.test(window.name);
const popupName = getGUID();
if (needPopup) {
const oldWindowOpen = window.open;
window.open = function(href, name, params) {
try {
const url = new URL(href);
if (
url.protocol === "https:" &&
(url.hostname === "m.facebook.com" ||
url.hostname === "www.facebook.com") &&
url.pathname.endsWith("/oauth")
) {
name = popupName;
}
} catch (_) {}
return oldWindowOpen.call(window, href, name, params);
};
}
async function allowFacebookSDK(callback) {
await sendMessageToAddon("optIn");
window.FB = undefined;
const oldInit = window.fbAsyncInit;
window.fbAsyncInit = () => {
ready = true;
if (typeof initInfo !== "undefined") {
window.FB.init(initInfo);
} else if (oldInit) {
oldInit();
}
if (callback) {
callback();
}
};
const s = document.createElement("script");
s.src = originalUrl;
await new Promise((resolve, reject) => {
s.onerror = reject;
s.onload = function() {
for (const args of pendingParses) {
window.FB.XFBML.parse.apply(window.FB.XFBML, args);
}
resolve();
};
document.head.appendChild(s);
});
}
function buildPopupParams() {
const { outerWidth, outerHeight, screenX, screenY } = window;
const { width, height } = window.screen;
const w = Math.min(width, 400);
const h = Math.min(height, 400);
const ua = navigator.userAgent;
const isMobile = ua.includes("Mobile") || ua.includes("Tablet");
const left = screenX + (screenX < 0 ? width : 0) + (outerWidth - w) / 2;
const top = screenY + (screenY < 0 ? height : 0) + (outerHeight - h) / 2.5;
let params = `left=${left},top=${top},width=${w},height=${h},scrollbars=1,toolbar=0,location=1`;
if (!isMobile) {
params = `${params},width=${w},height=${h}`;
}
return params;
}
async function doLogin(a, b) {
window.FB.login(a, b);
}
function proxy(name, fn) {
return function() {
if (ready) {
return window.FB[name].apply(this, arguments);
}
return fn.apply(this, arguments);
};
}
window.FB = {
api: proxy("api", () => {}),
AppEvents: {
EventNames: {},
logPageView: () => {},
},
Event: {
subscribe: () => {},
},
getAccessToken: proxy("getAccessToken", () => null),
getAuthResponse: proxy("getAuthResponse", () => {
return { status: "" };
}),
getLoginStatus: proxy("getLoginStatus", cb => {
cb({ status: "" });
}),
getUserID: proxy("getUserID", () => {}),
init: _initInfo => {
if (ready) {
doLogin(_initInfo);
} else {
initInfo = _initInfo; // in case the site is not using fbAsyncInit
}
},
login: (a, b) => {
// We have to load Facebook's script, and then wait for it to call
// window.open. By that time, the popup blocker will likely trigger.
// So we open a popup now with about:blank, and then make sure FB
// will re-use that same popup later.
if (needPopup) {
window.open("about:blank", popupName, buildPopupParams());
}
allowFacebookSDK(() => {
doLogin(a, b);
});
},
logout: proxy("logout", cb => cb()),
XFBML: {
parse: e => {
pendingParses.push([e]);
},
},
};
if (window.fbAsyncInit) {
window.fbAsyncInit();
}
}
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