Compare commits

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16 Commits

Author SHA1 Message Date
Xe Iaso
0d51f21a24 chore: spelling
Signed-off-by: Xe Iaso <me@xeiaso.net>
2025-08-28 12:17:41 +00:00
Xe Iaso
55ad36ec10 docs(blog): add post about the odd CPU core count bug
Signed-off-by: Xe Iaso <me@xeiaso.net>
2025-08-28 12:14:36 +00:00
Xe Iaso
c661bc37d1 fix(worker): constrain nonce value to be a whole integer (#1045)
* fix(worker): constrain nonce value to be a whole integer

Closes #1043

Sometimes the worker could get into a strange state where it has a
decimal nonce, but the server assumes that the nonce can only be a whole
number. This patch constrains the nonce to be a whole number on the
worker end by detecting if the nonce is a decimal number and then
truncating away the decimal portion.

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore: spelling

Signed-off-by: Xe Iaso <me@xeiaso.net>

* fix(algorithms/fast): truncate decimal place on number of threads

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>
2025-08-26 14:05:03 -04:00
dependabot[bot]
fb8ce508ee build(deps-dev): bump the npm group across 1 directory with 3 updates (#1032)
Bumps the npm group with 3 updates in the / directory: [cssnano](https://github.com/cssnano/cssnano), [cssnano-preset-advanced](https://github.com/cssnano/cssnano) and [esbuild](https://github.com/evanw/esbuild).


Updates `cssnano` from 7.1.0 to 7.1.1
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/cssnano@7.1.0...cssnano@7.1.1)

Updates `cssnano-preset-advanced` from 7.0.8 to 7.0.9
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/cssnano-preset-advanced@7.0.8...cssnano-preset-advanced@7.0.9)

Updates `esbuild` from 0.25.8 to 0.25.9
- [Release notes](https://github.com/evanw/esbuild/releases)
- [Changelog](https://github.com/evanw/esbuild/blob/main/CHANGELOG.md)
- [Commits](https://github.com/evanw/esbuild/compare/v0.25.8...v0.25.9)

---
updated-dependencies:
- dependency-name: cssnano
  dependency-version: 7.1.1
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: npm
- dependency-name: cssnano-preset-advanced
  dependency-version: 7.0.9
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: npm
- dependency-name: esbuild
  dependency-version: 0.25.9
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: npm
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
2025-08-25 00:33:44 +00:00
Jason Cameron
573b0079fb Update metadata (#1031) 2025-08-24 21:40:12 +00:00
Skyler Mäntysaari
d1d631a18a lib/checker: Implement X-Original-URI support (#1015) 2025-08-23 23:14:37 -04:00
Timo Tijhof
f3cd6c9ca4 docs: fix "stored" typo in CHANGELOG.md (#1008)
Co-authored-by: Jason Cameron <git@jasoncameron.dev>
2025-08-24 03:12:08 +00:00
Brad Parbs
23772fd3cb s/Wordpress/WordPress in docs (#1020)
Signed-off-by: Brad Parbs <brad@bradparbs.com>
2025-08-24 02:52:09 +00:00
Xe Iaso
a7a61690fc chore: commit for v1.22.0-pre1
Signed-off-by: Xe Iaso <me@xeiaso.net>
2025-08-23 22:39:43 -04:00
Xe Iaso
f5afe8b6c8 chore: release v1.22.0-pre1
Signed-off-by: Xe Iaso <me@xeiaso.net>
2025-08-24 02:38:54 +00:00
Julian Krieger
61682e4987 Update installation.mdx to include a link to the Caddy docs (#993)
* Update installation.mdx to include a link to the Caddy docs

Signed-off-by: Julian Krieger <julian.krieger@hm.edu>

* Update CHANGELOG.md to include documentation changes

Signed-off-by: Julian Krieger <julian.krieger@hm.edu>

---------

Signed-off-by: Julian Krieger <julian.krieger@hm.edu>
2025-08-20 23:02:49 +00:00
Xe Iaso
b0fa256e3e fix(default-config): also block alibaba cloud (#1005)
* fix(default-config): also block alibaba cloud

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore: spelling

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>
2025-08-20 23:01:49 +00:00
Xe Iaso
ee55d857eb fix(default-config): block Huawei Cloud (#1004)
* fix(default-config): block Huawei Cloud

Closes #978

Huawei Cloud has been egregious about its scraping. All attempts to
contact their abuse team have failed. If you work for Huawei Cloud,
please raise this issue internally and get the scraping to just stop.

* chore: spelling

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>
2025-08-20 22:40:07 +00:00
Xe Iaso
993ea8da1b chore: copy SECURITY.md from TecharoHQ/.github
This hopefully makes the security policy harder to miss.

Signed-off-by: Xe Iaso <xe.iaso@techaro.lol>
2025-08-20 12:42:02 -04:00
Xe Iaso
6e4e471792 fix(lib): ensure issued challenges don't get double-spent (#1003)
* fix(lib): ensure issued challenges don't get double-spent

Closes #1002

TL;DR: challenge IDs were not validated at time of token issuance. A
dedicated attacker could solve a challenge once and reuse it across
multiple sessons in order to mint additional tokens.

With the advent of store based challenge issuance in #749, this means
that these challenge IDs are only good for 30 minutes. Websites using
the most recent version of Anubis have limited exposure to this problem.

Websites using older versions of Anubis have a much more increased
exposure to this problem and are encouraged to keep this software
updated as often and as frequently as possible.

* docs: update CHANGELOG

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>
2025-08-20 12:33:32 -04:00
Xe Iaso
e8dfff6350 feat(blog): add short funding update post (#994)
* feat(blog): add short funding update post

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore: spelling

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>
2025-08-18 08:42:27 -04:00
24 changed files with 2545 additions and 139 deletions

View File

@@ -1,5 +1,6 @@
acs
Aibrew
alibaba
alrest
amazonbot
anthro
@@ -17,6 +18,7 @@ badregexes
bbolt
bdba
berr
bezier
bingbot
Bitcoin
bitrate
@@ -63,6 +65,7 @@ Cromite
crt
Cscript
daemonizing
dayjob
DDOS
Debian
debrpm
@@ -80,6 +83,7 @@ dracula
dronebl
droneblresponse
dropin
dsilence
duckduckbot
eerror
ellenjoe
@@ -98,6 +102,7 @@ Factset
fastcgi
fediverse
ffprobe
financials
finfos
Firecrawl
flagenv
@@ -112,6 +117,7 @@ geoip
geoipchecker
gha
GHSA
Ghz
gipc
gitea
godotenv
@@ -125,6 +131,7 @@ goyaml
GPG
GPT
gptbot
Graphene
grpcprom
grw
Hashcash
@@ -134,11 +141,13 @@ healthcheck
healthz
hec
hmc
homelab
hostable
htmlc
htmx
httpdebug
Huawei
huawei
hypertext
iaskspider
iaso
@@ -254,6 +263,7 @@ runlevels
RUnlock
runtimedir
runtimedirectory
Ryzen
sas
sasl
searchbot
@@ -285,6 +295,7 @@ SVCNAME
tagline
tarballs
tarrif
taviso
tbn
tbr
techaro
@@ -299,6 +310,7 @@ Tik
Timpibot
TLog
traefik
trunc
uberspace
Unbreak
unbreakdocker
@@ -327,6 +339,7 @@ wordpress
Workaround
workdir
wpbot
XCircle
Xeact
xeiaso
xeserv
@@ -336,6 +349,7 @@ xff
XForwarded
XNG
XOB
XOriginal
XReal
yae
YAMLTo

13
SECURITY.md Normal file
View File

@@ -0,0 +1,13 @@
# Security Policy
Techaro follows the [Semver 2.0 scheme](https://semver.org/).
## Supported Versions
Techaro strives to support the two most recent minor versions of Anubis. Patches to those versions will be published as patch releases.
## Reporting a Vulnerability
Email security@techaro.lol with details on the vulnerability and reproduction steps. You will get a response as soon as possible.
Please take care to send your email as a mixed plaintext and HTML message. Messages with GPG signatures or that are plaintext only may be blocked by the spam filter.

View File

@@ -12,8 +12,8 @@
bots:
# Pathological bots to deny
- # This correlates to data/bots/deny-pathological.yaml in the source tree
# https://github.com/TecharoHQ/anubis/blob/main/data/bots/deny-pathological.yaml
- # This correlates to data/bots/_deny-pathological.yaml in the source tree
# https://github.com/TecharoHQ/anubis/blob/main/data/bots/_deny-pathological.yaml
import: (data)/bots/_deny-pathological.yaml
- import: (data)/bots/aggressive-brazilian-scrapers.yaml

View File

@@ -2,3 +2,5 @@
- import: (data)/bots/headless-browsers.yaml
- import: (data)/bots/us-ai-scraper.yaml
- import: (data)/bots/custom-async-http-client.yaml
- import: (data)/crawlers/alibaba-cloud.yaml
- import: (data)/crawlers/huawei-cloud.yaml

View File

@@ -0,0 +1,881 @@
- name: alibaba-cloud
action: DENY
# Updated 2025-08-20 from IP addresses for AS45102
remote_addresses:
- 103.81.186.0/23
- 110.76.21.0/24
- 110.76.23.0/24
- 116.251.64.0/18
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View File

@@ -0,0 +1,617 @@
- name: huawei-cloud
action: DENY
# Updated 2025-08-20 from IP addresses for AS136907
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---
slug: 2025/funding-update
title: Funding update
authors: [xe]
tags: [funding]
image: around-the-bend.webp
---
![](./around-the-bend.webp)
As we finish up work on [all of the features in the next release of Anubis](/docs/CHANGELOG#unreleased), I took a moment to add up the financials and here's an update on the recurring revenue of the project. Once I reach the [$5000 per month](https://github.com/TecharoHQ/anubis/discussions/278) mark, I can start reducing hours at my dayjob and start to make working on Anubis my full time job.
{/* truncate */}
Note that this only counts _recurring_ revenue (subscriptions to [BotStopper](/docs/admin/botstopper) and monthly repeating donations). Every one of the one-time donations I get is a gift and I am grateful for them, but I cannot make critically important financial decisions off of sporadic one-time donations.
:::note
All currency figures in this article are USD (United States Dollars) unless denoted otherwise.
:::
Here's the funding breakdown by income stream:
```mermaid
pie title Funding update August 2025
"GitHub Sponsors" : 3500
"Patreon" : 1500
"Liberapay" : 100
"Remaining" : 4800
```
Assuming that some of my private support contracts and other sales effort go through, this will slightly change the shapes of this (a new pie chart segment will emerge for "Manual invoices"), but I am halfway there. This is a huge bar to pass and as it stands right now this is just enough income to pay for my monthly rent (not accounting for tax).
As a reminder, here's the rough plan for the phases I want to hit based on the _recurring_ donation totals:
| Monthly donations | Details |
| :-------------------------- | :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| $0-5,000 per month | Anubis is a nights and weekends project based on how much spare time and energy I have. |
| $5,000-10,000 per month | Anubis gets 1-2 days per week of my time put into it consistently and I go part-time at my dayjob. |
| $10,000-15,000 per month | Anubis becomes my full time job. Features that are currently exclusive to [BotStopper](/docs/admin/botstopper/) start to trickle down to the open source version of Anubis. |
| $15,000 per month and above | I start planning hiring for Techaro. |
If your organization benefits from Anubis, please consider donating to the project in order to make this sustainable. The fewer financial problems I have means the more that Anubis can become better.
## New funding platform: Liberapay
After many comments about the funding options, I have set up [Liberapay](https://liberapay.com/Xe/) as an option to receive donations. Additional funding targets will be added to Liberapay as soon as I hear back from my accountant with more information. All money received via Liberapay goes directly towards supporting the project.
## Next goals
Here's my short term goals for the immediate future:
1. Finish [Thoth](/docs/admin/thoth/) and run a backfill to mass issue API keys.
2. Document and publish the writeup for the multi-region Google Cloud spot instance setup that Thoth is built upon.
3. Release v1.22.0 of Anubis with Traefik support and other important fixes.
4. Continue growing the project into a sustainable business.
5. Work through the [blog backlog](https://github.com/TecharoHQ/anubis/issues?q=is%3Aissue%20state%3Aopen%20label%3Ablog) to document the thoughts behind Anubis and how parts of it work.
Thank you for supporting Anubis! It's only going to get better from here.

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import React, { useState, useEffect, useMemo } from 'react';
import styles from './styles.module.css';
// A helper function to perform SHA-256 hashing.
// It takes a string, encodes it, hashes it, and returns a hex string.
async function sha256(message) {
try {
const msgBuffer = new TextEncoder().encode(message);
const hashBuffer = await crypto.subtle.digest('SHA-256', msgBuffer);
const hashArray = Array.from(new Uint8Array(hashBuffer));
const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
return hashHex;
} catch (error) {
console.error("Hashing failed:", error);
return "Error hashing data";
}
}
// Generates a random hex string of a given byte length
const generateRandomHex = (bytes = 16) => {
const buffer = new Uint8Array(bytes);
crypto.getRandomValues(buffer);
return Array.from(buffer)
.map(byte => byte.toString(16).padStart(2, '0'))
.join('');
};
// Icon components for better visual feedback
const CheckIcon = () => (
<svg xmlns="http://www.w3.org/2000/svg" className={styles.iconGreen} fill="none" viewBox="0 0 24 24" stroke="currentColor">
<path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 12l2 2 4-4m6 2a9 9 0 11-18 0 9 9 0 0118 0z" />
</svg>
);
const XCircleIcon = () => (
<svg xmlns="http://www.w3.org/2000/svg" className={styles.iconRed} fill="none" viewBox="0 0 24 24" stroke="currentColor">
<path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M10 14l2-2m0 0l2-2m-2 2l-2-2m2 2l2 2m7-2a9 9 0 11-18 0 9 9 0 0118 0z" />
</svg>
);
// Main Application Component
export default function App() {
// State for the challenge, initialized with a random 16-byte hex string.
const [challenge, setChallenge] = useState(() => generateRandomHex(16));
// State for the nonce, which is the variable we can change
const [nonce, setNonce] = useState(0);
// State to store the resulting hash
const [hash, setHash] = useState('');
// A flag to indicate if the current hash is the "winning" one
const [isMining, setIsMining] = useState(false);
const [isFound, setIsFound] = useState(false);
// The mining difficulty, i.e., the required number of leading zeros
const difficulty = "00";
// Memoize the combined data to avoid recalculating on every render
const combinedData = useMemo(() => `${challenge}${nonce}`, [challenge, nonce]);
// This effect hook recalculates the hash whenever the combinedData changes.
useEffect(() => {
let isMounted = true;
const calculateHash = async () => {
const calculatedHash = await sha256(combinedData);
if (isMounted) {
setHash(calculatedHash);
setIsFound(calculatedHash.startsWith(difficulty));
}
};
calculateHash();
return () => { isMounted = false; };
}, [combinedData, difficulty]);
// This effect handles the automatic mining process
useEffect(() => {
if (!isMining) return;
let miningNonce = nonce;
let continueMining = true;
const mine = async () => {
while (continueMining) {
const currentData = `${challenge}${miningNonce}`;
const currentHash = await sha256(currentData);
if (currentHash.startsWith(difficulty)) {
setNonce(miningNonce);
setIsMining(false);
break;
}
miningNonce++;
// Update the UI periodically to avoid freezing the browser
if (miningNonce % 100 === 0) {
setNonce(miningNonce);
await new Promise(resolve => setTimeout(resolve, 0)); // Yield to the browser
}
}
};
mine();
return () => {
continueMining = false;
}
}, [isMining, challenge, nonce, difficulty]);
const handleMineClick = () => {
setIsMining(true);
}
const handleStopClick = () => {
setIsMining(false);
}
const handleResetClick = () => {
setIsMining(false);
setNonce(0);
}
const handleNewChallengeClick = () => {
setIsMining(false);
setChallenge(generateRandomHex(16));
setNonce(0);
}
// Helper to render the hash with colored leading characters
const renderHash = () => {
if (!hash) return <span>...</span>;
const prefix = hash.substring(0, difficulty.length);
const suffix = hash.substring(difficulty.length);
const prefixColor = isFound ? styles.hashPrefixGreen : styles.hashPrefixRed;
return (
<>
<span className={`${prefixColor} ${styles.hashPrefix}`}>{prefix}</span>
<span className={styles.hashSuffix}>{suffix}</span>
</>
);
};
return (
<div className={styles.container}>
<div className={styles.innerContainer}>
<div className={styles.grid}>
{/* Challenge Block */}
<div className={styles.block}>
<h2 className={styles.blockTitle}>1. Challenge</h2>
<p className={styles.challengeText}>{challenge}</p>
</div>
{/* Nonce Control Block */}
<div className={styles.block}>
<h2 className={styles.blockTitle}>2. Nonce</h2>
<div className={styles.nonceControls}>
<button onClick={() => setNonce(n => n - 1)} disabled={isMining} className={styles.nonceButton}>
<svg xmlns="http://www.w3.org/2000/svg" className={styles.iconSmall} fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M20 12H4" /></svg>
</button>
<span className={styles.nonceValue}>{nonce}</span>
<button onClick={() => setNonce(n => n + 1)} disabled={isMining} className={styles.nonceButton}>
<svg xmlns="http://www.w3.org/2000/svg" className={styles.iconSmall} fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 4v16m8-8H4" /></svg>
</button>
</div>
</div>
{/* Combined Data Block */}
<div className={styles.block}>
<h2 className={styles.blockTitle}>3. Combined Data</h2>
<p className={styles.combinedDataText}>{combinedData}</p>
</div>
</div>
{/* Arrow pointing down */}
<div className={styles.arrowContainer}>
<svg xmlns="http://www.w3.org/2000/svg" className={styles.iconGray} fill="none" viewBox="0 0 24 24" stroke="currentColor">
<path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 14l-7 7m0 0l-7-7m7 7V3" />
</svg>
</div>
{/* Hash Output Block */}
<div className={`${styles.hashContainer} ${isFound ? styles.hashContainerSuccess : styles.hashContainerError}`}>
<div className={styles.hashContent}>
<div className={styles.hashText}>
<h2 className={styles.blockTitle}>4. Resulting Hash (SHA-256)</h2>
<p className={styles.hashValue}>{renderHash()}</p>
</div>
<div className={styles.hashIcon}>
{isFound ? <CheckIcon /> : <XCircleIcon />}
</div>
</div>
</div>
{/* Mining Controls */}
<div className={styles.buttonContainer}>
{!isMining ? (
<button onClick={handleMineClick} className={`${styles.button} ${styles.buttonCyan}`}>
Auto-Mine
</button>
) : (
<button onClick={handleStopClick} className={`${styles.button} ${styles.buttonYellow}`}>
Stop Mining
</button>
)}
<button onClick={handleNewChallengeClick} className={`${styles.button} ${styles.buttonIndigo}`}>
New Challenge
</button>
<button onClick={handleResetClick} className={`${styles.button} ${styles.buttonGray}`}>
Reset Nonce
</button>
</div>
</div>
</div>
);
}

View File

@@ -0,0 +1,317 @@
/* Main container styles */
.container {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
color: white;
font-family: ui-sans-serif, system-ui, sans-serif;
margin-top: 2rem;
margin-bottom: 2rem;
}
.innerContainer {
width: 100%;
max-width: 56rem;
margin: 0 auto;
}
/* Header styles */
.header {
text-align: center;
margin-bottom: 2.5rem;
}
.title {
font-size: 2.25rem;
font-weight: 700;
color: rgb(34 211 238);
}
.subtitle {
font-size: 1.125rem;
color: rgb(156 163 175);
margin-top: 0.5rem;
}
/* Grid layout styles */
.grid {
display: grid;
grid-template-columns: repeat(3, 1fr);
gap: 1rem;
align-items: center;
text-align: center;
}
/* Block styles */
.block {
background-color: rgb(31 41 55);
padding: 1.5rem;
border-radius: 0.5rem;
box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
height: 100%;
display: flex;
flex-direction: column;
justify-content: center;
}
.blockTitle {
font-size: 1.125rem;
font-weight: 600;
color: rgb(34 211 238);
margin-bottom: 0.5rem;
}
.challengeText {
font-size: 0.875rem;
color: rgb(209 213 219);
word-break: break-all;
font-family: ui-monospace, SFMono-Regular, monospace;
}
.combinedDataText {
font-size: 0.875rem;
color: rgb(156 163 175);
word-break: break-all;
font-family: ui-monospace, SFMono-Regular, monospace;
}
/* Nonce control styles */
.nonceControls {
display: flex;
align-items: center;
justify-content: center;
gap: 1rem;
}
.nonceButton {
background-color: rgb(55 65 81);
border-radius: 9999px;
padding: 0.5rem;
transition: background-color 200ms;
}
.nonceButton:hover:not(:disabled) {
background-color: rgb(34 211 238);
}
.nonceButton:disabled {
opacity: 0.5;
cursor: not-allowed;
}
.nonceValue {
font-size: 1.5rem;
font-family: ui-monospace, SFMono-Regular, monospace;
width: 6rem;
text-align: center;
}
/* Icon styles */
.icon {
height: 2rem;
width: 2rem;
}
.iconGreen {
height: 2rem;
width: 2rem;
color: rgb(74 222 128);
}
.iconRed {
height: 2rem;
width: 2rem;
color: rgb(248 113 113);
}
.iconSmall {
height: 1.5rem;
width: 1.5rem;
}
.iconGray {
height: 2.5rem;
width: 2.5rem;
color: rgb(75 85 99);
animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}
/* Arrow animation */
@keyframes pulse {
0%,
100% {
opacity: 1;
}
50% {
opacity: 0.5;
}
}
.arrowContainer {
display: flex;
justify-content: center;
margin: 1.5rem 0;
}
/* Hash output styles */
.hashContainer {
padding: 1.5rem;
border-radius: 0.5rem;
box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
transition: all 300ms;
border: 2px solid;
}
.hashContainerSuccess {
background-color: rgb(20 83 45 / 0.5);
border-color: rgb(74 222 128);
}
.hashContainerError {
background-color: rgb(127 29 29 / 0.5);
border-color: rgb(248 113 113);
}
.hashContent {
display: flex;
flex-direction: column;
align-items: center;
justify-content: space-between;
}
.hashText {
text-align: center;
}
.hashTextLg {
text-align: left;
}
.hashValue {
font-size: 0.875rem;
word-break: break-all;
}
.hashValueLg {
font-size: 1rem;
word-break: break-all;
}
.hashIcon {
margin-top: 1rem;
}
.hashIconLg {
margin-top: 0;
}
/* Hash highlighting */
.hashPrefix {
font-family: ui-monospace, SFMono-Regular, monospace;
}
.hashPrefixGreen {
color: rgb(74 222 128);
}
.hashPrefixRed {
color: rgb(248 113 113);
}
.hashSuffix {
font-family: ui-monospace, SFMono-Regular, monospace;
color: rgb(156 163 175);
}
/* Button styles */
.buttonContainer {
margin-top: 2rem;
display: flex;
align-items: center;
justify-content: center;
gap: 1rem;
}
.button {
font-weight: 700;
padding: 0.75rem 1.5rem;
border-radius: 0.5rem;
transition: transform 150ms;
}
.button:hover {
transform: scale(1.05);
}
.buttonCyan {
background-color: rgb(8 145 178);
color: white;
}
.buttonCyan:hover {
background-color: rgb(6 182 212);
}
.buttonYellow {
background-color: rgb(202 138 4);
color: white;
}
.buttonYellow:hover {
background-color: rgb(245 158 11);
}
.buttonIndigo {
background-color: rgb(79 70 229);
color: white;
}
.buttonIndigo:hover {
background-color: rgb(99 102 241);
}
.buttonGray {
background-color: rgb(55 65 81);
color: white;
}
.buttonGray:hover {
background-color: rgb(75 85 99);
}
/* Responsive styles */
@media (min-width: 768px) {
.title {
font-size: 3rem;
}
.grid {
grid-template-columns: repeat(3, 1fr);
gap: 1rem;
}
.hashContent {
flex-direction: row;
}
.hashText {
text-align: left;
}
.hashValue {
font-size: 1rem;
}
.hashIcon {
margin-top: 0;
}
}
@media (max-width: 767px) {
.grid {
display: flex;
flex-direction: column;
gap: 1rem;
}
}

View File

@@ -0,0 +1,129 @@
---
slug: 2025/cpu-core-odd
title: Sometimes CPU cores are odd
description: "TL;DR: all the assumptions you have about processor design are wrong and if you are unlucky you will never run into problems that users do through sheer chance."
authors: [xe]
tags:
- bugfix
- implementation
image: parc-dsilence.webp
---
import ProofOfWorkDiagram from "./ProofOfWorkDiagram";
![](./parc-dsilence.webp)
One of the biggest lessons that I've learned in my career is that all software has bugs, and the more complicated your software gets the more complicated your bugs get. A lot of the time those bugs will be fairly obvious and easy to spot, validate, and replicate. Sometimes, the process of fixing it will uncover your core assumptions about how things work in ways that will leave you feeling like you just got trolled.
Today I'm going to talk about a single line fix that prevents people on a large number of devices from having weird irreproducible issues with Anubis rejecting people when it frankly shouldn't. Stick around, it's gonna be a wild ride.
{/* truncate */}
## How this happened
Anubis is a web application firewall that tries to make sure that the client is a browser. It uses a few [challenge methods](/docs/admin/configuration/challenges/) to do this determination, but the main method is the [proof of work](/docs/admin/configuration/challenges/proof-of-work/) challenge which makes clients grind away at cryptographic checksums in order to rate limit clients from connecting too eagerly.
:::note
In retrospect implementing the proof of work challenge may have been a mistake and it's likely to be supplanted by things like [Proof of React](https://github.com/TecharoHQ/anubis/pull/1038) or other methods that have yet to be developed. Your patience and polite behaviour in the bug tracker is appreciated.
:::
In order to make sure the proof of work challenge screen _goes away as fast as possible_, the [worker code](https://github.com/TecharoHQ/anubis/tree/main/web/js/worker) is optimized within an inch of its digital life. One of the main ways that this code is optimized is with how it's run. Over the last 10-20 years, the main way that CPUs have gotten fast is via increasing multicore performance. Anubis tries to make sure that it can use as many cores as possible in order to take advantage of your device's CPU as much as it can.
This strategy sometimes has some issues though, for one Firefox seems to get _much slower_ if you have Anubis try to absolutely saturate all of the cores on the system. It also has a fairly high overhead between JavaScript JIT code and [WebCrypto](https://developer.mozilla.org/en-US/docs/Web/API/Web_Crypto_API). I did some testing and found out that Firefox's point of diminishing returns was about half of the CPU cores.
## Another "invalid response" bug
One of the complaints I've been getting from users and administrators using Anubis is that they've been running into issues where users get randomly rejected with an error message only saying "invalid response". This happens when the challenge validating process fails. This issue has been blocking the release of the next version of Anubis.
In order to demonstrate this better, I've made a little interactive diagram for the proof of work process:
<ProofOfWorkDiagram />
I've fixed a lot of the easy bugs in Anubis by this point. A lot of what's left is the hard bugs, but also specifically the kinds of hard bugs that involve weird hardware configurations. In order to try and catch these issues before software hits prod, I test Anubis against a bunch of hardware I have locally. Any issues I find and fix before software ships are issues that you don't hit in production.
Let's consider [the line of code](https://github.com/TecharoHQ/anubis/blob/main/web/js/algorithms/fast.mjs) that was causing this issue:
```js
threads = Math.max(navigator.hardwareConcurrency / 2, 1),
```
This is intended to make your browser spawn a proof of work worker for _half_ of your available CPU cores. If you only have one CPU core, you should only have one worker. Each thread is given this number of threads and uses that to increment the nonce so that each thread doesn't try to find a solution that another worker has already performed.
One of the subtle problems here is that all of the parts of this assume that the thread ID and nonce are integers without a decimal portion. Famously, [all JavaScript numbers are IEEE 754 floating point numbers](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number). Surely there wouldn't be a case where the thread count could be a _decimal_ number, right?
Here's all the devices I use to test Anubis _and their core counts_:
| Device Name | Core Count |
| :--------------------------- | :--------- |
| MacBook Pro M3 Max | 16 |
| MacBook Pro M4 Max | 16 |
| AMD Ryzen 9 7950x3D | 32 |
| Google Pixel 9a (GrapheneOS) | 8 |
| iPhone 15 Pro Max | 6 |
| iPad Pro (M1) | 8 |
| iPad mini | 6 |
| Steam Deck | 8 |
| Core i5 10600 (homelab) | 12 |
| ROG Ally | 16 |
Notice something? All of those devices have an _even_ number of cores. Some devices such as the [Pixel 8 Pro](https://www.gsmarena.com/google_pixel_8_pro-12545.php) have an _odd_ number of cores. So what happens with that line of code as the JavaScript engine evaluates it?
Let's replace the [`navigator.hardwareConcurrency`](https://developer.mozilla.org/en-US/docs/Web/API/Navigator/hardwareConcurrency) with the Pixel 8 Pro's 9 cores:
```js
threads = Math.max(9 / 2, 1),
```
Then divide it by two:
```js
threads = Math.max(4.5, 1),
```
Oops, that's not ideal. However `4.5` is bigger than `1`, so [`Math.max`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/max) returns that:
```js
threads = 4.5,
```
This means that each time the proof of work equation is calculated, there is a 50% chance that a valid solution would include a nonce with a decimal portion in it. If the client finds a solution with such a nonce, then it would think the client was successful and submit the solution to the server, but the server only expects whole numbers back so it rejects that as an invalid response.
I keep telling more junior people that when you have the weirdest, most inconsistent bugs in software that it's going to boil down to the dumbest possible thing you can possibly imagine. People don't believe me, then they encounter bugs like this. Then they suddenly believe me.
Here is the fix:
```js
threads = Math.trunc(Math.max(navigator.hardwareConcurrency / 2, 1)),
```
This uses [`Math.trunc`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc) to truncate away the decimal portion so that the Pixel 8 Pro has `4` workers instead of `4.5` workers.
## Today I learned this was possible
This was a total "today I learned" moment. I didn't actually think that hardware vendors shipped processors with an odd number of cores, however if you look at the core geometry of the Pixel 8 Pro, it has _three_ tiers of processor cores:
| Core type | Core model | Number |
| :----------------- | :------------------- | :----- |
| High performance | 3 Ghz Cortex X3 | 1 |
| Medium performance | 2.45 Ghz Cortex A715 | 4 |
| High efficiency | 2.15 Cortex A510 | 4 |
| Total | | 9 |
I guess every assumption that developers have about CPU design is probably wrong.
This probably isn't helped by the fact that for most of my career, the core count in phones has been largely irrelevant and most of the desktop / laptop CPUs I've had (where core count does matter) uses [simultaneous multithreading](https://en.wikipedia.org/wiki/Simultaneous_multithreading) to "multiply" the core count by two.
The client side fix is a bit of an "emergency stop" button to try and mitigate the badness as early as possible. In general I'm quite aware of the terrible UX involved with this flow failing and I'm still noodling through ways to make that UX better and easier for users / administrators to debug.
I'm looking into the following:
1. This could have been prevented on the server side by doing less strict input validation in compliance with [Postel's Law](https://en.wikipedia.org/wiki/Robustness_principle). I feel nervous about making such a security-sensitive endpoint _more liberal_ with the inputs it can accept, but it may be fine? I need to consult with a security expert.
2. Showing an encrypted error message on the "invalid response" page so that the user and administrator can work together to fix or report the issue. I remember Google doing this at least once, but I can't recall where I've seen it in the past. Either way, this is probably the most robust method even though it would require developing some additional tooling. I think it would be worth it.
I'm likely going to go with the second option. I will need to figure out a good flow for this. It's likely going to involve [age](https://github.com/FiloSottile/age). I'll say more about this when I have more to say.
In the meantime though, looks like I need to expense a used Pixel 8 Pro to add to the testing jungle for Anubis. If anyone has a deal out there, please let me know!
Thank you to the people that have been polite and helpful when trying to root cause and fix this issue.

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@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
<!-- This changes the project to: -->
- Added a missing link to the Caddy installation environment in the installation documentation.
- Downstream consumers can change the default [log/slog#Logger](https://pkg.go.dev/log/slog#Logger) instance that Anubis uses by setting `opts.Logger` to your slog instance of choice ([#864](https://github.com/TecharoHQ/anubis/issues/864)).
- The [Thoth client](https://anubis.techaro.lol/docs/admin/thoth) is now public in the repo instead of being an internal package.
- [Custom-AsyncHttpClient](https://github.com/AsyncHttpClient/async-http-client)'s default User-Agent has an increased weight by default ([#852](https://github.com/TecharoHQ/anubis/issues/852)).
@@ -30,6 +31,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
- The hard dependency on WebCrypto has been removed, allowing a proof of work challenge to work over plain (unencrypted) HTTP.
- Firefox for Android support has been fixed by embedding the challenge ID into the pass-challenge route. This also fixes some inconsistent issues with other mobile browsers.
- The Anubis version number is put in the footer of every page.
- Prevent the proof of work nonce from being a decimal value by using Math.trunc to coerce it back to an integer if it happens ([#1043](https://github.com/TecharoHQ/anubis/issues/1043)).
- The legacy JSON based policy file example has been removed and all documentation for how to write a policy file in JSON has been deleted. JSON based policy files will still work, but YAML is the superior option for Anubis configuration.
- A standard library HTTP server log message about HTTP pipelining not working has been filtered out of Anubis' logs. There is no action that can be taken about it.
- The default `favicon` pattern in `data/common/keep-internet-working.yaml` has been updated to permit requests for png/gif/jpg/svg files as well as ico.
@@ -38,6 +40,25 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
- Add optional restrictions for JWT based on the value of a header ([#697](https://github.com/TecharoHQ/anubis/pull/697))
- The word "hack" has been removed from the translation strings for Anubis due to incidents involving people misunderstanding that word and sending particularly horrible things to the project lead over email.
- Bump AI-robots.txt to version 1.39
- Add a default block rule for Huawei Cloud.
- Add a default block rule for Alibaba Cloud.
- Add X-Request-URI support so that Subrequest Authentication has path support.
### Security-relevant changes
#### Fix potential double-spend for challenges
Anubis operates by issuing a challenge and having the client present a solution for that challenge. Challenges are identified by a unique UUID, which is stored in the database.
The problem is that a challenge could potentially be used twice by a dedicated attacker making a targeted attack against Anubis. Challenge records did not have a "spent" or "used" field. In total, a dedicated attacker could solve a challenge once and reuse that solution across multiple sessions in order to mint additional tokens.
This was fixed by adding a "spent" field to challenges in the data store. When a challenge is solved, that "spent" field gets set to `true`. If a future attempt to solve this challenge is observed, it gets rejected.
With the advent of store based challenge issuance in [#749](https://github.com/TecharoHQ/anubis/pull/749), this means that these challenge IDs are [only good for 30 minutes](https://github.com/TecharoHQ/anubis/blob/e8dfff635015d6c906dddd49cb0eaf591326092a/lib/anubis.go#L130-L135d). Websites using the most recent version of Anubis have limited exposure to this problem.
Websites using older versions of Anubis have a much more increased exposure to this problem and are encouraged to keep this software updated as often and as frequently as possible.
Thanks to [@taviso](https://github.com/taviso) for reporting this issue.
### Breaking changes

View File

@@ -1,6 +1,6 @@
# Wordpress
# WordPress
Wordpress is the most popular blog engine on the planet.
WordPress is the most popular blog engine on the planet.
## Using a multi-site setup with Anubis
@@ -27,7 +27,7 @@ flowchart LR
US --> |whatever you're doing| B
```
Wordpress may not realize that the underlying connection is being done over HTTPS. This could lead to a redirect loop in the `/wp-admin/` routes. In order to fix this, add the following to your `wp-config.php` file:
WordPress may not realize that the underlying connection is being done over HTTPS. This could lead to a redirect loop in the `/wp-admin/` routes. In order to fix this, add the following to your `wp-config.php` file:
```php
if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https') {
@@ -36,4 +36,4 @@ if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROT
}
```
This will make Wordpress think that your connection is over HTTPS instead of plain HTTP.
This will make WordPress think that your connection is over HTTPS instead of plain HTTP.

View File

@@ -178,6 +178,7 @@ Alternatively here is a key generated by your browser:
To get Anubis filtering your traffic, you need to make sure it's added to your HTTP load balancer or platform configuration. See the [environments category](/docs/category/environments) for detailed information on individual environments.
- [Apache](./environments/apache.mdx)
- [Caddy](./environments/caddy.mdx)
- [Docker compose](./environments/docker-compose.mdx)
- [Kubernetes](./environments/kubernetes.mdx)
- [Nginx](./environments/nginx.mdx)

View File

@@ -454,6 +454,12 @@ func (s *Server) PassChallenge(w http.ResponseWriter, r *http.Request) {
return
}
if chall.Spent {
lg.Error("double spend prevented", "reason", "double_spend")
s.respondWithError(w, r, fmt.Sprintf("%s: %s", localizer.T("internal_server_error"), "double_spend"))
return
}
impl, ok := challenge.Get(chall.Method)
if !ok {
lg.Error("check failed", "err", err)
@@ -527,6 +533,12 @@ func (s *Server) PassChallenge(w http.ResponseWriter, r *http.Request) {
s.SetCookie(w, CookieOpts{Path: cookiePath, Host: r.Host, Value: tokenString})
chall.Spent = true
j := store.JSON[challenge.Challenge]{Underlying: s.store}
if err := j.Set(r.Context(), "challenge:"+chall.ID, *chall, 30*time.Minute); err != nil {
lg.Debug("can't update information about challenge", "err", err)
}
challengesValidated.WithLabelValues(rule.Challenge.Algorithm).Inc()
lg.Debug("challenge passed, redirecting to app")
http.Redirect(w, r, redir, http.StatusFound)

View File

@@ -9,4 +9,5 @@ type Challenge struct {
RandomData string `json:"randomData"` // The random data the client processes
IssuedAt time.Time `json:"issuedAt"` // When the challenge was issued
Metadata map[string]string `json:"metadata"` // Challenge metadata such as IP address and user agent
Spent bool `json:"spent"` // Has the challenge already been solved?
}

View File

@@ -102,6 +102,13 @@ func NewPathChecker(rexStr string) (checker.Impl, error) {
}
func (pc *PathChecker) Check(r *http.Request) (bool, error) {
originalUrl := r.Header.Get("X-Original-URI")
if originalUrl != "" {
if pc.regexp.MatchString(originalUrl) {
return true, nil
}
}
if pc.regexp.MatchString(r.URL.Path) {
return true, nil
}

View File

@@ -198,3 +198,96 @@ func TestHeaderExistsChecker(t *testing.T) {
})
}
}
func TestPathChecker_XOriginalURI(t *testing.T) {
tests := []struct {
name string
regex string
xOriginalURI string
urlPath string
headerKey string
expectedMatch bool
expectError bool
}{
{
name: "X-Original-URI matches regex (with trailing space - current typo)",
regex: "^/api/.*",
xOriginalURI: "/api/users",
urlPath: "/different/path",
headerKey: "X-Original-URI",
expectedMatch: true,
expectError: false,
},
{
name: "X-Original-URI doesn't match, falls back to URL.Path",
regex: "^/admin/.*",
xOriginalURI: "/api/users",
urlPath: "/admin/dashboard",
headerKey: "X-Original-URI",
expectedMatch: true,
expectError: false,
},
{
name: "Neither X-Original-URI nor URL.Path match",
regex: "^/admin/.*",
xOriginalURI: "/api/users",
urlPath: "/public/info",
headerKey: "X-Original-URI ",
expectedMatch: false,
expectError: false,
},
{
name: "Empty X-Original-URI, URL.Path matches",
regex: "^/static/.*",
xOriginalURI: "",
urlPath: "/static/css/style.css",
headerKey: "X-Original-URI",
expectedMatch: true,
expectError: false,
},
{
name: "Complex regex matching X-Original-URI",
regex: `^/api/v[0-9]+/(users|posts)/[0-9]+$`,
xOriginalURI: "/api/v1/users/123",
urlPath: "/different",
headerKey: "X-Original-URI",
expectedMatch: true,
expectError: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
// Create the PathChecker
pc, err := NewPathChecker(tt.regex)
if err != nil {
if !tt.expectError {
t.Fatalf("NewPathChecker() unexpected error: %v", err)
}
return
}
if tt.expectError {
t.Fatal("NewPathChecker() expected error but got none")
}
req, err := http.NewRequest("GET", "http://example.com"+tt.urlPath, nil)
if err != nil {
t.Fatalf("Failed to create request: %v", err)
}
if tt.xOriginalURI != "" {
req.Header.Set(tt.headerKey, tt.xOriginalURI)
}
match, err := pc.Check(req)
if err != nil {
t.Fatalf("Check() unexpected error: %v", err)
}
if match != tt.expectedMatch {
t.Errorf("Check() = %v, want %v", match, tt.expectedMatch)
}
})
}
}

254
package-lock.json generated
View File

@@ -1,20 +1,20 @@
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},
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@@ -924,15 +924,15 @@
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"resolved": "https://registry.npmjs.org/cssnano-preset-advanced/-/cssnano-preset-advanced-7.0.8.tgz",
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"resolved": "https://registry.npmjs.org/cssnano-preset-advanced/-/cssnano-preset-advanced-7.0.9.tgz",
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"dev": true,
"license": "MIT",
"dependencies": {
"autoprefixer": "^10.4.21",
"browserslist": "^4.25.1",
"cssnano-preset-default": "^7.0.8",
"cssnano-preset-default": "^7.0.9",
"postcss-discard-unused": "^7.0.4",
"postcss-merge-idents": "^7.0.1",
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@@ -946,9 +946,9 @@
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},
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"resolved": "https://registry.npmjs.org/cssnano-preset-default/-/cssnano-preset-default-7.0.8.tgz",
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@@ -957,7 +957,7 @@
"cssnano-utils": "^5.0.1",
"postcss-calc": "^10.1.1",
"postcss-colormin": "^7.0.4",
"postcss-convert-values": "^7.0.6",
"postcss-convert-values": "^7.0.7",
"postcss-discard-comments": "^7.0.4",
"postcss-discard-duplicates": "^7.0.2",
"postcss-discard-empty": "^7.0.1",
@@ -1143,9 +1143,9 @@
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"resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.25.8.tgz",
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"dev": true,
"hasInstallScript": true,
"license": "MIT",
@@ -1156,32 +1156,32 @@
"node": ">=18"
},
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}
},
"node_modules/escalade": {
@@ -1718,9 +1718,9 @@
}
},
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"resolved": "https://registry.npmjs.org/postcss-convert-values/-/postcss-convert-values-7.0.6.tgz",
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"dev": true,
"license": "MIT",
"dependencies": {

View File

@@ -1,6 +1,6 @@
{
"name": "@techaro/anubis",
"version": "1.21.3",
"version": "1.22.0-pre1",
"description": "",
"main": "index.js",
"scripts": {
@@ -18,9 +18,9 @@
"author": "",
"license": "ISC",
"devDependencies": {
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"esbuild": "^0.25.8",
"cssnano": "^7.1.1",
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"playwright": "^1.52.0",
"postcss-cli": "^11.0.1",
"postcss-import": "^16.1.1",
@@ -30,4 +30,4 @@
"dependencies": {
"@aws-crypto/sha256-js": "^5.2.0"
}
}
}

View File

@@ -4,7 +4,7 @@ export default function process(
difficulty = 5,
signal = null,
progressCallback = null,
threads = Math.max(navigator.hardwareConcurrency / 2, 1),
threads = Math.trunc(Math.max(navigator.hardwareConcurrency / 2, 1)),
) {
console.debug("fast algo");

View File

@@ -53,6 +53,18 @@ addEventListener('message', async ({ data: eventData }) => {
nonce += threads;
iterations++;
/* Truncate the decimal portion of the nonce. This is a bit of an evil bit
* hack, but it works reliably enough. The core of why this works is:
*
* > 13.4 % 1 !== 0
* true
* > 13 % 1 !== 0
* false
*/
if (nonce % 1 !== 0) {
nonce = Math.trunc(nonce);
}
// Send a progress update from the main thread every 1024 iterations.
if (isMainThread && (iterations & 1023) === 0) {
postMessage(nonce);

View File

@@ -49,6 +49,18 @@ addEventListener("message", async ({ data: eventData }) => {
nonce += threads;
iterations++;
/* Truncate the decimal portion of the nonce. This is a bit of an evil bit
* hack, but it works reliably enough. The core of why this works is:
*
* > 13.4 % 1 !== 0
* true
* > 13 % 1 !== 0
* false
*/
if (nonce % 1 !== 0) {
nonce = Math.trunc(nonce);
}
// Send a progress update from the main thread every 1024 iterations.
if (isMainThread && (iterations & 1023) === 0) {
postMessage(nonce);