feat: Adds countdown to return to page

post_install.sh

@@ -60,3 +60,9 @@ if [ -z "$WAYLAND_DISPLAY" ] && [ "$(tty)" = "/dev/tty1" ]; then
     exec cage firefox --kiosk https://c3nav.de
 fi
 EOF
+
+mkdir -p /home/kiosk/.mozilla/firefox
+curl -fsSL -o /tmp/Firefox.zip "https://git.hamburg.ccc.de/Firefox.zip"
+unzip -o /tmp/Firefox.zip -d /home/kiosk/.mozilla/firefox
+chown -R kiosk:kiosk /home/kiosk/.mozilla/firefox
+rm -f /tmp/Firefox.zip

preseed.cfg

@@ -53,6 +53,7 @@ d-i pkgsel/include string \
     sudo \
     cage \
     firefox-esr \
+    unzip \
     curl
 
 d-i pkgsel/exclude string gnome-software
@@ -64,4 +65,4 @@ d-i finish-install/reboot_in_progress note
 d-i preseed/late_command string \
     in-target curl -o /tmp/post_install.sh https://git.hamburg.ccc.de/ViMaSter/preseed/raw/branch/main/post_install.sh; \
     in-target chmod +x /tmp/post_install.sh; \
-    in-target /tmp/post_install.sh
+    in-target /tmp/post_install.sh;

tampermonkey/backtohome.js

@@ -9,22 +9,31 @@
 // @grant        GM_addStyle
 // ==/UserScript==
 
+const target = "https://kiosk.39c3.by.vincent.mahn.ke/";
 (function() {
     'use strict';
 
+    // if the user is on target already or subdomain, do nothing
+    if (window.location.href === target || window.location.href.startsWith(target + '/')) {
+        return;
+    }
+
     const btn = document.createElement('button');
     btn.textContent = 'Home';
     btn.style.cssText = '     all: unset; box-sizing: border-box; border: 2px solid #141414; background: #faf5f5; text-align: center; color: #141414;  position: fixed;    right: 10px;    bottom: 10px;    width: 60px;    height: 60px;    z-index: 2147483647;    padding-top: 6px;    border-radius: 60px;';
     btn.innerHTML = '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-house-icon lucide-house"><path d="M15 21v-8a1 1 0 0 0-1-1h-4a1 1 0 0 0-1 1v8"/><path d="M3 10a2 2 0 0 1 .709-1.528l7-6a2 2 0 0 1 2.582 0l7 6A2 2 0 0 1 21 10v9a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z"/></svg>';
     btn.addEventListener('click', () => {
-      window.location.href = 'http://127.0.0.1:8080';
+      window.location.href = target;
     });
     (document.body || document.documentElement).appendChild(btn);
 
 
-    const IDLE_LIMIT_MS = 30_000; // 30 seconds
+    const IDLE_LIMIT_MS = 60_000;
     let idleTimer = null;
     let promptVisible = false;
+    const PROMPT_LIMIT_MS = 30_000;
+    let promptInterval = null;
+    let promptTimeout = null;
 
     const modal = document.createElement('div');
     modal.id = 'idle-modal';
@@ -46,6 +55,7 @@
       <p>Do you want to stay on this page or go back to the home page?</p>
       <button id="idle-stay">Stay</button>
       <button id="idle-go">Go to Home</button>
+      <p id="idle-countdown-msg" style="margin-top:8px">Auto return in <span id="idle-countdown">30</span>s</p>
     `;
     document.body.appendChild(modal);
 
@@ -76,21 +86,57 @@
       promptVisible = true;
       modal.hidden = false;
       backdrop.hidden = false;
-      debugger;
+
-      // Move focus to the primary action for accessibility
+      // Clear any previous prompt timers
-        document.querySelector("#idle-stay").addEventListener("click", () => {
+      if (promptInterval) { clearInterval(promptInterval); promptInterval = null; }
+      if (promptTimeout) { clearTimeout(promptTimeout); promptTimeout = null; }
+
+      // Wire button actions (once to avoid duplicates)
+      const stayBtn = document.querySelector("#idle-stay");
+      const goBtn = document.querySelector("#idle-go");
+
+      if (stayBtn) {
+        stayBtn.addEventListener("click", () => {
           hidePrompt();
           resetIdleTimer();
-      });
+        }, { once: true });
-        document.querySelector("#idle-go").addEventListener("click", () => {
+      }
-          window.location.href = 'https://www.google.com';
+
-      });
+      if (goBtn) {
+        goBtn.addEventListener("click", () => {
+          window.location.href = target;
+        }, { once: true });
+      }
+
+      // 30s countdown visible to the user
+      let remaining = PROMPT_LIMIT_MS / 1000; // seconds
+      const countdownEl = document.querySelector("#idle-countdown");
+      if (countdownEl) countdownEl.textContent = String(remaining);
+
+      promptInterval = setInterval(() => {
+        remaining -= 1;
+        if (remaining >= 0 && countdownEl) {
+          countdownEl.textContent = String(remaining);
+        }
+      }, 1000);
+
+      // Auto-go when expired
+      promptTimeout = setTimeout(() => {
+        const go = document.querySelector("#idle-go");
+        if (go) {
+          go.click();
+        } else {
+          window.location.href = target;
+        }
+      }, PROMPT_LIMIT_MS);
     }
 
     function hidePrompt() {
       promptVisible = false;
       modal.hidden = true;
       backdrop.hidden = true;
+      if (promptInterval) { clearInterval(promptInterval); promptInterval = null; }
+      if (promptTimeout) { clearTimeout(promptTimeout); promptTimeout = null; }
     }
 
     function onIdle() {