commit f515fae4e30941b4dd1dee8f9dea263bc3ee9631
Author: Joachim Hummel <jh@unixweb.de>
Date:   Mon Apr 13 09:11:52 2026 +0000

    First commit

diff --git a/.claude/commands/screens.md b/.claude/commands/screens.md
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+# Screens
+
+Suche nach Screenshots im `screens/`-Verzeichnis des aktuellen Arbeitsverzeichnisses (`process.cwd()/screens`).
+
+## Vorgehen
+
+1. Prüfe ob `./screens/` existiert — wenn nicht, darauf hinweisen und ggf. den Server starten
+2. Liste alle Dateien in `./screens/` auf (sortiert nach Änderungszeit, neueste zuerst)
+3. Zeige Dateinamen, Größe und Datum übersichtlich an
+4. Wenn der Nutzer nach einer bestimmten Datei fragt, suche per Glob oder Grep in `./screens/`
+
+## Befehle
+
+```bash
+# Alle Screenshots auflisten (neueste zuerst)
+ls -lt ./screens/
+
+# Nur Bilddateien
+ls -lt ./screens/*.{png,jpg,jpeg,gif,webp,bmp} 2>/dev/null
+
+# Nach Name suchen
+ls ./screens/*<suchbegriff>*
+```
+
+## Hinweise
+
+- Dateien werden durch den Screenshot-Upload-Server in `./screens/` gespeichert
+- Server starten: `server.sh start` (aus dem Projektverzeichnis)
+- Wenn `./screens/` nicht existiert, wurde noch kein Upload durchgeführt oder der Server läuft nicht
diff --git a/CLAUDE.md b/CLAUDE.md
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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+A minimal, self-contained image upload server written in vanilla Node.js (ES modules). No external dependencies — only Node.js built-ins (`http`, `fs`, `path`, `url`).
+
+## Running the Server
+
+```bash
+# Direct
+node server.mjs
+
+# Via daemon manager
+./server.sh start
+./server.sh stop
+./server.sh restart
+./server.sh status
+```
+
+- Listens on `0.0.0.0:8765` (hardcoded in `server.mjs`)
+- Logs to `/tmp/server_mjs.log`; PID tracked at `/tmp/server_mjs.pid`
+
+## Architecture
+
+The entire application lives in two files:
+
+**`server.mjs`** — Three logical sections:
+1. **Embedded HTML UI** (lines 9–85): Full self-contained frontend (HTML/CSS/JS) as a string constant — no separate asset files. Dark theme, drag-and-drop, German labels.
+2. **`parseMultipart()`** (lines 87–110): Custom binary multipart/form-data parser; no external library.
+3. **HTTP server** (lines 112–145): Two routes — `GET /` serves the UI, `POST /upload` saves files to the directory where `server.mjs` lives.
+
+**`server.sh`** — Daemon management (start/stop/restart/status). Note: the path inside the script points to `/home/joachim/git/ai-coding-kit/screens/server.mjs`, not the local copy — update if deploying from this directory.
+
+## Key Conventions
+
+- **Save location**: Files are written to the same directory as `server.mjs` via `fileURLToPath(import.meta.url)`.
+- **Filename sanitization**: `path.basename()` prevents path traversal; regex `/[^a-zA-Z0-9._\- ()äöüÄÖÜß]/g`replaces disallowed characters with underscores. German characters are intentionally allowed.
+- **Synchronous writes**: `fs.writeFileSync()` is used deliberately for simplicity.
+- **UI is embedded**: Keep HTML/CSS/JS inside the string constant in `server.mjs` — there are no separate asset files by design.
diff --git a/README.md b/README.md
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+# Screenshot-Server
+
+Ein minimaler Upload-Server für Screenshots und Bilder, geschrieben in vanilla Node.js – ohne externe Abhängigkeiten.
+
+## Funktionsweise
+
+Der Server stellt eine Web-Oberfläche bereit, über die Bilder per Drag & Drop oder Dateiauswahl hochgeladen werden können. Die Dateien werden direkt in das Verzeichnis gespeichert, in dem `server.mjs` liegt.
+
+- **Port:** 8765
+- **Erreichbar unter:** `http://<IP>:8765`
+- **Unterstützte Dateitypen:** Bilder (`image/*`)
+- **Dateinamen:** Sonderzeichen werden bereinigt; Umlaute (äöüÄÖÜß) sind erlaubt
+
+## Voraussetzungen
+
+- Node.js (ES-Module-Unterstützung, d.h. Node 14+)
+- Kein `npm install` notwendig
+
+## Starten
+
+### Direkt
+
+```bash
+node server.mjs
+```
+
+### Als Hintergrunddienst (über `server.sh`)
+
+```bash
+./server.sh start    # Starten
+./server.sh stop     # Stoppen
+./server.sh restart  # Neustart
+./server.sh status   # Status anzeigen
+```
+
+Logs werden nach `/tmp/server_mjs.log` geschrieben.
+
+> **Hinweis:** In `server.sh` ist der Pfad zur `server.mjs` hardcodiert. Bei abweichendem Speicherort muss `APP_CMD` in Zeile 3 angepasst werden.
diff --git a/screens/Screen.png b/screens/Screen.png
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diff --git a/server.mjs b/server.mjs
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+import http from "http";
+import fs from "fs";
+import path from "path";
+import { fileURLToPath } from "url";
+
+const DIR = path.join(process.cwd(), "screens");
+if (!fs.existsSync(DIR)) fs.mkdirSync(DIR, { recursive: true });
+const PORT = 8765;
+
+const HTML = `<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>📸 Screens Upload</title>
+  <style>
+    * { box-sizing: border-box; margin: 0; padding: 0; }
+    body { font-family: system-ui, sans-serif; background: #0a0a0a; color: #fff; min-height: 100vh; display: flex; align-items: center; justify-content: center; }
+    .card { background: #111; border: 1px solid #222; border-radius: 16px; padding: 40px; width: 100%; max-width: 480px; }
+    h1 { font-size: 1.4rem; margin-bottom: 8px; }
+    p { color: #666; font-size: 0.9rem; margin-bottom: 24px; }
+    .drop-zone { border: 2px dashed #333; border-radius: 12px; padding: 40px; text-align: center; cursor: pointer; transition: all 0.2s; }
+    .drop-zone:hover, .drop-zone.over { border-color: #fff; background: #1a1a1a; }
+    .drop-zone input { display: none; }
+    .drop-zone label { cursor: pointer; font-size: 2rem; display: block; margin-bottom: 8px; }
+    .drop-zone span { color: #555; font-size: 0.85rem; }
+    .btn { display: block; width: 100%; margin-top: 16px; padding: 12px; background: #fff; color: #000; border: none; border-radius: 8px; font-size: 1rem; font-weight: 600; cursor: pointer; }
+    .btn:hover { background: #ddd; }
+    .status { margin-top: 16px; padding: 12px; border-radius: 8px; font-size: 0.85rem; display: none; }
+    .status.ok { background: #0d2b0d; color: #4ade80; border: 1px solid #166534; display: block; }
+    .status.err { background: #2b0d0d; color: #f87171; border: 1px solid #991b1b; display: block; }
+    .files { margin-top: 8px; font-size: 0.8rem; color: #888; }
+  </style>
+</head>
+<body>
+  <div class="card">
+    <h1>📸 Screens Upload</h1>
+    <p>Screenshots direkt in den <code>screens/</code> Ordner im aktuellen Verzeichnis hochladen.</p>
+    <div class="drop-zone" id="zone">
+      <label for="file">🖼️</label>
+      <input type="file" id="file" multiple accept="image/*">
+      <span>Drag & Drop oder klicken zum Auswählen</span>
+      <div class="files" id="filelist"></div>
+    </div>
+    <button class="btn" onclick="upload()">Hochladen</button>
+    <div class="status" id="status"></div>
+  </div>
+  <script>
+    const zone = document.getElementById("zone");
+    const fileInput = document.getElementById("file");
+    const filelist = document.getElementById("filelist");
+    const status = document.getElementById("status");
+
+    fileInput.addEventListener("change", updateList);
+    zone.addEventListener("dragover", e => { e.preventDefault(); zone.classList.add("over"); });
+    zone.addEventListener("dragleave", () => zone.classList.remove("over"));
+    zone.addEventListener("drop", e => {
+      e.preventDefault(); zone.classList.remove("over");
+      fileInput.files = e.dataTransfer.files;
+      updateList();
+    });
+
+    function updateList() {
+      const names = [...fileInput.files].map(f => f.name).join(", ");
+      filelist.textContent = names ? "📎 " + names : "";
+    }
+
+    async function upload() {
+      if (!fileInput.files.length) { showStatus("Keine Datei ausgewählt.", "err"); return; }
+      const form = new FormData();
+      for (const f of fileInput.files) form.append("file", f);
+      try {
+        const res = await fetch("/upload", { method: "POST", body: form });
+        const text = await res.text();
+        if (res.ok) { showStatus("✅ " + text, "ok"); fileInput.value = ""; filelist.textContent = ""; }
+        else showStatus("❌ " + text, "err");
+      } catch(e) { showStatus("❌ Verbindungsfehler", "err"); }
+    }
+
+    function showStatus(msg, type) {
+      status.textContent = msg;
+      status.className = "status " + type;
+    }
+  </script>
+</body>
+</html>`;
+
+function parseMultipart(body, boundary) {
+  const files = [];
+  const sep = Buffer.from("--" + boundary);
+  const parts = [];
+  let start = body.indexOf(sep) + sep.length + 2;
+  while (start < body.length) {
+    const end = body.indexOf(sep, start);
+    if (end === -1) break;
+    parts.push(body.slice(start, end - 2));
+    start = end + sep.length + 2;
+  }
+  for (const part of parts) {
+    const headerEnd = part.indexOf("\r\n\r\n");
+    if (headerEnd === -1) continue;
+    const header = part.slice(0, headerEnd).toString();
+    const content = part.slice(headerEnd + 4);
+    const nameMatch = header.match(/name="([^"]+)"/);
+    const fileMatch = header.match(/filename="([^"]+)"/);
+    if (nameMatch && fileMatch) {
+      files.push({ name: fileMatch[1], data: content });
+    }
+  }
+  return files;
+}
+
+const server = http.createServer((req, res) => {
+  if (req.method === "GET" && req.url === "/") {
+    res.writeHead(200, { "Content-Type": "text/html; charset=utf-8" });
+    return res.end(HTML);
+  }
+
+  if (req.method === "POST" && req.url === "/upload") {
+    const ct = req.headers["content-type"] || "";
+    const match = ct.match(/boundary=(.+)/);
+    if (!match) {
+      res.writeHead(400); return res.end("Kein Boundary");
+    }
+    const boundary = match[1];
+    const chunks = [];
+    req.on("data", c => chunks.push(c));
+    req.on("end", () => {
+      const body = Buffer.concat(chunks);
+      const files = parseMultipart(body, boundary);
+      if (!files.length) { res.writeHead(400); return res.end("Keine Datei gefunden"); }
+      const saved = [];
+      for (const file of files) {
+        const safeName = path.basename(file.name).replace(/[^a-zA-Z0-9._\- ()äöüÄÖÜß]/g, "_");
+        const dest = path.join(DIR, safeName);
+        fs.writeFileSync(dest, file.data);
+        saved.push(safeName);
+        console.log(`✅ Gespeichert: ${safeName}`);
+      }
+      res.writeHead(200); res.end(saved.join(", ") + " gespeichert.");
+    });
+    return;
+  }
+
+  res.writeHead(404); res.end("Not found");
+});
+
+server.listen(PORT, "0.0.0.0", () => {
+  console.log(`📸 Screens Upload Server läuft auf http://0.0.0.0:${PORT}`);
+  console.log(`📁 Speicherort: ${DIR}`);
+});
diff --git a/server.sh b/server.sh
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+#!/bin/bash
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+APP_CMD="node $SCRIPT_DIR/server.mjs"
+PID_FILE="/tmp/server_mjs.pid"
+
+start() {
+    if [ -f "$PID_FILE" ]; then
+        PID=$(cat "$PID_FILE")
+        if ps -p $PID > /dev/null 2>&1; then
+            echo "Service läuft bereits (PID: $PID)"
+            exit 1
+        else
+            echo "Alte PID-Datei gefunden, wird entfernt"
+            rm -f "$PID_FILE"
+        fi
+    fi
+
+    echo "Starte Service..."
+    nohup $APP_CMD > /tmp/server_mjs.log 2>&1 &
+    echo $! > "$PID_FILE"
+    echo "Gestartet mit PID $(cat $PID_FILE)"
+}
+
+stop() {
+    if [ ! -f "$PID_FILE" ]; then
+        echo "Keine PID-Datei gefunden – läuft der Service?"
+        exit 1
+    fi
+
+    PID=$(cat "$PID_FILE")
+
+    if ps -p $PID > /dev/null 2>&1; then
+        echo "Stoppe Service (PID: $PID)..."
+        kill $PID
+        rm -f "$PID_FILE"
+        echo "Gestoppt"
+    else
+        echo "Prozess läuft nicht mehr, entferne PID-Datei"
+        rm -f "$PID_FILE"
+    fi
+}
+
+status() {
+    if [ -f "$PID_FILE" ]; then
+        PID=$(cat "$PID_FILE")
+        if ps -p $PID > /dev/null 2>&1; then
+            echo "Service läuft (PID: $PID)"
+        else
+            echo "PID-Datei vorhanden, aber Prozess läuft nicht"
+            exit 1
+        fi
+    else
+        echo "Service gestoppt"
+        exit 3
+    fi
+}
+
+case "$1" in
+    start)
+        start
+        ;;
+    stop)
+        stop
+        ;;
+    restart)
+        stop
+        sleep 1
+        start
+        ;;
+    status)
+        status
+        ;;
+    *)
+        echo "Usage: $0 {start|stop|restart|status}"
+        exit 1
+        ;;
+esac