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antiRevoke.js
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antiRevoke.js
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'use strict';
const KEY_PREFIX = 'deleted_';
const BASE_URL = new URL('{{BASE_URL}}');
const myDeletedMessages = new Set();
function getDeletedPosts(channelId) {
return JSON.parse(localStorage.getItem(`${KEY_PREFIX}${channelId}`)) || [];
}
function storePost(post) {
const posts = getDeletedPosts(post.channel_id);
posts.push(post);
localStorage.setItem(`${KEY_PREFIX}${post.channel_id}`, JSON.stringify(posts));
}
window.clearDeletedPosts = function () {
Object.keys(localStorage)
.filter(key => key.startsWith(KEY_PREFIX))
.forEach(key => localStorage.removeItem(key));
}
function getReduxState() {
let reactRoot = document.getElementById('root')?._reactRootContainer?._internalRoot?.current;
if (!reactRoot) {
console.error('[!] Could not get internal root information from reactRoot element');
return;
}
while (reactRoot) {
const reduxState = reactRoot?.pendingProps?.store?.getState();
if (reduxState) {
return reduxState;
}
reactRoot = reactRoot.child;
}
console.error('[!] Could not find redux state');
}
function getUserById(userId) {
const reduxState = getReduxState();
const profiles = reduxState?.entities?.users?.profiles;
return profiles[userId]?.username || userId;
}
function getPostInfo(postId) {
const httpRequest = new XMLHttpRequest();
httpRequest.open("POST", `${BASE_URL.origin}/api/v4/posts/ids`, false);
httpRequest.setRequestHeader("x-requested-with", "XMLHttpRequest");
httpRequest.send(JSON.stringify([postId]));
if (httpRequest.status !== 200) {
return;
}
return JSON.parse(httpRequest.response)[0];
}
function onMessageHook(evt, originalOnMessage) {
if (!evt) {
return;
}
const msg = JSON.parse(evt.data);
if (!msg.event || msg.event !== "post_deleted") {
return originalOnMessage(evt);
}
const post = JSON.parse(msg.data.post);
if (myDeletedMessages.has(post.id)) {
myDeletedMessages.delete(post.id);
return originalOnMessage(evt);
}
console.log('[*] Message deleted!');
const now = new Date().getTime();
const deletedBy = msg.data?.delete_by || getPostInfo(post.id)?.props?.deleteBy;
msg.event = "post_edited";
post.update_at = now;
post.edit_at = now;
post.type = "system_ephemeral";
post.message += ` - [sent by @${getUserById(post.user_id)}]` +
(deletedBy ? ` - [deleted by @${getUserById(deletedBy)}]` : '') // delete_by field is sent only to admin users.
delete msg.data.delete_by;
msg.data.post = JSON.stringify(post);
storePost(post);
return originalOnMessage(Object.assign({ data: JSON.stringify(msg) }, evt));
}
function hookWebsocket() {
const { get: onmessageGet, set: onmessageSet } = Object.getOwnPropertyDescriptor(WebSocket.prototype, 'onmessage');
Object.defineProperty(WebSocket.prototype, 'onmessage', {
get() { return onmessageGet.apply(this); },
set(...args) {
if (args.length < 0 || typeof args[0] !== 'function') {
return onmessageSet.apply(this, args);
}
console.log('[*] Hooking websocket!');
const onMessageHandler = args[0];
args[0] = (evt) => onMessageHook(evt, onMessageHandler);
return onmessageSet.apply(this, args);
}
});
}
function onFetchPostsRequestHook(url, data) {
const channelDeletedPosts = getDeletedPosts((url.pathname.match(/\/channels\/(\w*)\//) || [])[1]);
if (!channelDeletedPosts.length) {
return data;
}
let added = 0;
data.order = data.order.reverse(); // Reversing the order to make the code simpler.
const newOrder = [...data.order];
for (let i = -1; i < data.order.length; i++) {
const currPost = data.posts[data.order[i]] || { create_at: Number.MIN_SAFE_INTEGER };
const nextPost = data.posts[data.order[i + 1]] || { create_at: Number.MAX_SAFE_INTEGER };
channelDeletedPosts.filter(post => {
return post.create_at >= currPost.create_at && post.create_at < nextPost.create_at;
})
.sort((post1, post2) => post1.create_at - post2.create_at)
.forEach((post) => {
if (!data.posts.hasOwnProperty(post.id)) {
newOrder.splice(i + added + 1, 0, post.id);
added++;
}
data.posts[post.id] = post;
});
}
data.order = newOrder.reverse();
return data;
}
function hookFetchRequests() {
const { fetch: originalFetch } = window;
window.fetch = async (url, options) => {
try {
url = new URL(url);
} catch (_) {
return await originalFetch(url, options);
}
if (url.origin !== BASE_URL.origin || !new RegExp(/\/posts(?:[\/]\w+)?$/).test(url.pathname)) {
return await originalFetch(url, options);
}
if (options.method === 'delete') {
myDeletedMessages.add(url.pathname.slice(url.pathname.lastIndexOf('/') + 1));
}
const response = await originalFetch(url, options);
response.json = options.method === 'get' ? () =>
response
.clone()
.json()
.then((data) => onFetchPostsRequestHook(url, data))
.catch((error) => console.error(error))
: response.json;
return response;
};
}
hookFetchRequests();
hookWebsocket();