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https://github.com/sigmasternchen/axowall
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reduce size
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52309a8e21
commit
c32124b3fc
6 changed files with 43 additions and 61 deletions
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@ -1,5 +1,5 @@
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{
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"algo": "SHA-256",
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"prefixBits": "15",
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"prefixBits": 15,
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"input": "challenge:"
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}
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@ -5,6 +5,5 @@ export type Challenge = {
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input: string,
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}
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export function validateChallenge(challenge: Challenge): boolean {
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return !!challenge.algo && challenge.prefixBits > 0 && !!challenge.input;
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}
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export const validateChallenge = (challenge: Challenge): boolean =>
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!!challenge.algo && challenge.prefixBits > 0 && !!challenge.input;
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@ -1,18 +0,0 @@
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const suffixCharset = [
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"0123456789",
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"abcdefghijklmnopqrstuvwxyz",
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
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"+-",
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].flatMap(set => set.split(""));
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const suffixCharsetBits = 6;
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export function makeSuffix(index: number): string {
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let result = "";
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while (index > 0) {
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result += suffixCharset[index & ((1 << suffixCharsetBits) - 1)];
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index >>= suffixCharsetBits;
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}
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return result;
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}
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@ -2,7 +2,7 @@
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width: 300px;
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height: 70px;
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padding: 19px;
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border: 1px solid grey;
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border: 1px solid #888;
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box-sizing: border-box;
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font-size: 20px;
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font-family: sans-serif;
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@ -19,18 +19,18 @@
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height: 30px;
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width: 30px;
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display: inline-block;
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background-color: white;
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background-color: #fff;
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cursor: pointer;
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border: 1px solid black;
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border: 1px solid #000;
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border-radius: 3px;
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}
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.captcha .checkbox:hover {
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background-color: lightgrey;
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background-color: #eee;
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}
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.captcha .checkbox.checked {
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background-color: #2196F3;
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background-color: #29F;
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}
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.captcha .checkbox.checked::before {
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@ -41,7 +41,7 @@
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height: 15px;
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top: 2px;
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left: 9px;
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border: white solid;
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border: #fff solid;
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border-width: 0 5px 5px 0;
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transform: rotate(45deg);
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}
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@ -59,11 +59,11 @@
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height: 17px;
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border: 4px solid;
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border-radius: 50%;
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border-color: black transparent black transparent;
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animation: captchaLoading infinite 1s;
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border-color: #000 transparent #000 transparent;
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animation: _aw_l infinite 1s;
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}
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@keyframes captchaLoading {
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@keyframes _aw_l {
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to {
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transform: rotate(.5turn)
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}
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10
src/hash.ts
10
src/hash.ts
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@ -1,6 +1,3 @@
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const hexCharset = "0123456789abcdef".split("");
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export const sha256: AlgorithmIdentifier = "SHA-256";
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declare global {
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interface Uint8Array {
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@ -10,7 +7,7 @@ declare global {
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}
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Uint8Array.prototype.toHex = function(): string {
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return [...this].map(c => hexCharset[c >> 4] + hexCharset[c & 15]).join("");
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return [...this].map(c => (c >> 4).toString(16) + (c & 15).toString(16)).join("");
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};
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Uint8Array.prototype.hasPrefix = function(prefix: Uint8Array, bits: number): boolean {
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@ -27,6 +24,5 @@ Uint8Array.prototype.hasPrefix = function(prefix: Uint8Array, bits: number): boo
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return true;
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};
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export async function digest(algo: AlgorithmIdentifier, input: string): Promise<Uint8Array> {
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return new Uint8Array(await crypto.subtle.digest(algo, new TextEncoder().encode(input)));
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}
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export const digest = async (algo: AlgorithmIdentifier, input: string): Promise<Uint8Array> =>
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new Uint8Array(await crypto.subtle.digest(algo, new TextEncoder().encode(input)));
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51
src/main.ts
51
src/main.ts
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@ -1,16 +1,19 @@
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import {makeSuffix} from "./content";
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import {digest, sha256} from "./hash";
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import {digest} from "./hash";
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import "./default-styles.css";
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import {Challenge, validateChallenge} from "./challenge";
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async function findHashWithPrefix(hashPrefixBits: number, inputPrefix: string): Promise<string> {
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const CLASS_CHECKBOX = "checkbox";
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const CLASS_LOADING = "loading";
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const CLASS_CHECKED = "checked";
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const findHashWithPrefix = async (algo: string, hashPrefixBits: number, inputPrefix: string): Promise<string> => {
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const hashPrefix = new Uint8Array(Array(Math.ceil(hashPrefixBits / 8)).map(_ => 0));
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let iteration = 0;
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do {
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var message = inputPrefix + makeSuffix(iteration++);
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var hash = await digest(sha256, message);
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var message = inputPrefix + (iteration++).toString(36);
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var hash = await digest(algo, message);
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} while (!hash.hasPrefix(hashPrefix, hashPrefixBits));
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return message;
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@ -18,54 +21,56 @@ async function findHashWithPrefix(hashPrefixBits: number, inputPrefix: string):
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function initCaptchaContentAndGetCheckbox(captcha: Element): Element {
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const checkbox = document.createElement("div");
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checkbox.classList.add("checkbox");
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captcha.append(checkbox);
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checkbox.classList.add(CLASS_CHECKBOX, CLASS_LOADING);
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const text = document.createElement("span");
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text.innerText = "I am not a robot";
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captcha.append(text);
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captcha.append(checkbox, text);
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return checkbox;
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}
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const toggleChecked = (checkbox: Element) =>
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checkbox.classList.toggle(CLASS_CHECKED);
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const toggleLoading = (checkbox: Element) =>
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checkbox.classList.toggle(CLASS_LOADING);
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function prepareChallengeExecution(challenge: Challenge): () => Promise<void> {
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return async function() {
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console.log("Calculating...");
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this.classList.add("loading");
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toggleLoading(this);
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const response = await findHashWithPrefix(challenge.prefixBits, challenge.input);
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const response = await findHashWithPrefix(challenge.algo, challenge.prefixBits, challenge.input);
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console.log("Challenge Response: " + response);
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this.classList.remove("loading");
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this.classList.add("checked");
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toggleLoading(this);
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toggleChecked(this);
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}
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}
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async function prepareCaptcha(captcha: Element) {
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const prepareCaptcha = async (captcha: Element) => {
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const challengeUrl = captcha.getAttribute("data-challenge-url");
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if (!challengeUrl) {
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console.warn("No challenge URL found.");
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return;
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throw "No challenge URL found.";
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}
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const checkbox = initCaptchaContentAndGetCheckbox(captcha);
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checkbox.classList.add("loading");
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const challengeResponse = await fetch(challengeUrl);
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const challenge = await challengeResponse.json() as Challenge;
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if (!validateChallenge(challenge)) {
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console.warn("Challenge is invalid.");
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return;
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throw "Challenge is invalid.";
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}
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checkbox.classList.remove("loading");
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toggleLoading(checkbox);
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checkbox.addEventListener("click", prepareChallengeExecution(challenge));
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}
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window.addEventListener("load", () => {
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console.log("load");
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[...document.getElementsByClassName("captcha")].forEach(prepareCaptcha);
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});
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window.addEventListener("load", () =>
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[...document.getElementsByClassName("captcha")].forEach(prepareCaptcha)
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);
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