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Helmut Januschka hjanuschka

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@hjanuschka
hjanuschka / gist_ab_proof.md
Created May 13, 2026 13:13
Newsletter form captcha submit – A/B proof (RED/GREEN)

Newsletter Form – Captcha Submit A/B Proof

Short verification of the current integration on https://www.alstertal-einkaufszentrum.de/newsletter-registration/unsubscribe/?subId=… (same code path as Rheinparkcenter and other ECE centers).

TL;DR

The captcha SDK works correctly. The intermittent rejection comes from a custom submit listener that is registered before KROT.interceptForm(form) and calls e.stopImmediatePropagation(). When that branch is taken, the SDK's own submit listener never runs, so no token is computed and no token is sent.

@hjanuschka
hjanuschka / rheinparkcenter-neuss-captcha-fix-README.md
Created May 7, 2026 11:57
Rheinparkcenter Neuss captcha integration fix: missing token in POST due to fragile click handler flow

Rheinparkcenter Newsletter – Captcha Token Missing Fix

Context

On https://www.rheinparkcenter-neuss.de/newsletter-registration/, the current integration sometimes logs a generated captcha solution but the final POST request does not include it.

Root cause is the custom click-based orchestration around KROT.getSolution() plus KROT.interceptForm(form, true).

Existing problem points

Current code:

  • intercepts button click instead of stable form submit semantics
@hjanuschka
hjanuschka / README.txt
Last active April 7, 2026 12:10
Captcha.eu Joomla J6 compatibility package (base64 zip)
Captcha.eu Joomla plugin (J6 compatibility build, commit d741158)
This gist contains a Base64-encoded ZIP because GitHub Gist does not accept binary uploads via API/gh CLI.
Decode command (macOS/Linux):
base64 -d captcha_eu-j6-compat-1.0.2-root.zip.base64 > captcha_eu-j6-compat-1.0.2-root.zip
SHA256:
98b4b226dc51d4fb02ee795fbb750ea77b497215f5010bf47cc94312bdf595b1
@hjanuschka
hjanuschka / jxl_cmyk_icc_regression_test.cc
Last active March 31, 2026 22:05
Chromium JXL regression test: incremental CMYK ICC metadata visibility (crbug.com/498155364)
// Source: chromium/src/third_party/blink/renderer/platform/image-decoders/jxl/jxl_image_decoder_test.cc
// Regression test for crbug.com/498155364.
// With incremental input, basic image info should not become observable before
// the embedded ICC profile is parsed.
TEST_F(JXLImageDecoderTest, DecodeCmykIccProfileIncrementalNoCrash) {
scoped_refptr<SharedBuffer> full_data =
ReadFileToSharedBuffer(kJxlTestDir, "conformance_cmyk_layers.jxl");
ASSERT_TRUE(full_data);
Vector<char> full_data_vec = full_data->CopyAs<Vector<char>>();
@hjanuschka
hjanuschka / render_i480978106_macos.sh
Created March 27, 2026 14:30
Render i-480978106 page screenshot on macOS with headless Chrome/Chromium
#!/usr/bin/env bash
set -euo pipefail
# Usage:
# ./render_i480978106_macos.sh [page_path_or_url] [output_png]
#
# Examples:
# ./render_i480978106_macos.sh
# ./render_i480978106_macos.sh ~/my-host/static-files/i-480978106/index.html
# ./render_i480978106_macos.sh https://static.januschka.com/i-480978106/
@hjanuschka
hjanuschka / chrome-146-downloads.md
Created March 24, 2026 07:36
Chrome 146.0.7680.x Windows Download Links

Chrome 146.0.7680.x — Windows Download Links

All versions share revision 1582197 (M146 branch base).

Chrome for Testing (exact version builds)

146.0.7680.31

@hjanuschka
hjanuschka / use-local-jxl-rs.sh
Created March 12, 2026 08:07
Script to switch Chromium between vendored and local jxl-rs checkout (symlinks, bisect, override)
#!/bin/bash
# Switch Chromium to use local jxl-rs checkout for development
# Usage: ./use-local-jxl-rs.sh [setup|restore|status|clean|bisect|override]
set -e
CHROMIUM_SRC="/home/chrome/chromium_2/src"
CHROMIUM_VENDOR="$CHROMIUM_SRC/third_party/rust/chromium_crates_io/vendor"
LOCAL_JXL="$HOME/jxl-rs_1"
BUILD_GN="$CHROMIUM_SRC/third_party/rust/jxl/v0_3/BUILD.gn"
@hjanuschka
hjanuschka / jxl-decoder-rewrite.patch
Created March 12, 2026 07:51
JXL decoder: use frame scanner + seeking for animations, progressive flush
diff --git a/third_party/blink/renderer/platform/image-decoders/jxl/jxl_image_decoder.cc b/third_party/blink/renderer/platform/image-decoders/jxl/jxl_image_decoder.cc
index 5cadd5f76b2b7..995f304d6fffa 100644
--- a/third_party/blink/renderer/platform/image-decoders/jxl/jxl_image_decoder.cc
+++ b/third_party/blink/renderer/platform/image-decoders/jxl/jxl_image_decoder.cc
@@ -16,20 +16,21 @@
namespace blink {
using jxl_rs::jxl_rs_decoder_create;
+using jxl_rs::jxl_rs_frame_scanner_create;
using jxl_rs::jxl_rs_signature_check;
@hjanuschka
hjanuschka / lock.html
Last active February 16, 2026 01:22
screen.orientation.lock() tester for DevTools device emulation (crbug.com/40807290)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>screen.orientation.lock() Test</title>
<style>
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, monospace;
@hjanuschka
hjanuschka / joomla3-fix.patch
Created February 12, 2026 07:55
Fix Joomla 3.x compatibility for captcha.eu plugin - adds fallback for getWebAssetManager()
diff --git a/captcha_eu.php b/captcha_eu.php
index e73a26a..72e549d 100644
--- a/captcha_eu.php
+++ b/captcha_eu.php
@@ -88,10 +88,16 @@ class PlgCaptchacaptcha_eu extends CMSPlugin
$sdkSrc = 'https://www.captcha.eu/sdk.js';
- // Load assets, the callback should be first
- $this->app->getDocument()->getWebAssetManager()