From ff7b0459bcb4ef121659f6e3f5eaf618d1444a6a Mon Sep 17 00:00:00 2001
From: Bram <info@bramkelchtermans.be>
Date: Fri, 24 Oct 2025 22:18:01 +0200
Subject: [PATCH] port syncer

---
 .../Dockerfile                                |  34 +++++
 .../gluetun-qbittorrent-port-syncer/main.py   | 120 ++++++++++++++++++
 2 files changed, 154 insertions(+)
 create mode 100644 Dockers/gluetun-qbittorrent-port-syncer/Dockerfile
 create mode 100644 Dockers/gluetun-qbittorrent-port-syncer/main.py

diff --git a/Dockers/gluetun-qbittorrent-port-syncer/Dockerfile b/Dockers/gluetun-qbittorrent-port-syncer/Dockerfile
new file mode 100644
index 0000000..b1862e8
--- /dev/null
+++ b/Dockers/gluetun-qbittorrent-port-syncer/Dockerfile
@@ -0,0 +1,34 @@
+FROM python:3.11-slim
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Python dependencies
+RUN pip install --no-cache-dir \
+    requests \
+    watchdog
+
+# Create app directory
+WORKDIR /app
+
+# Copy the Python script
+COPY main.py .
+
+# Make the script executable
+RUN chmod +x main.py
+
+# Create a non-root user
+RUN useradd -m -u 1000 appuser && \
+    chown -R appuser:appuser /app
+
+# Switch to non-root user
+USER appuser
+
+# Set default environment variables
+ENV PORT_FORWARDED=/tmp/port_forwarded
+ENV HTTP_S=http
+
+# Run the application
+CMD ["python", "main.py"]
\ No newline at end of file
diff --git a/Dockers/gluetun-qbittorrent-port-syncer/main.py b/Dockers/gluetun-qbittorrent-port-syncer/main.py
new file mode 100644
index 0000000..a83bb0c
--- /dev/null
+++ b/Dockers/gluetun-qbittorrent-port-syncer/main.py
@@ -0,0 +1,120 @@
+#!/usr/bin/env python3
+import os
+import time
+import requests
+import tempfile
+from pathlib import Path
+from watchdog.observers import Observer
+from watchdog.events import FileSystemEventHandler
+
+class PortFileHandler(FileSystemEventHandler):
+    def __init__(self, port_syncer):
+        self.port_syncer = port_syncer
+
+    def on_modified(self, event):
+        if not event.is_directory and event.src_path == self.port_syncer.port_file:
+            self.port_syncer.update_port()
+
+class QBitTorrentPortSyncer:
+    def __init__(self):
+        self.cookies_file = "/tmp/cookies.txt"
+        self.port_file = os.getenv('PORT_FORWARDED', '/tmp/port_forwarded')
+        self.qbittorrent_user = os.getenv('QBITTORRENT_USER')
+        self.qbittorrent_pass = os.getenv('QBITTORRENT_PASS')
+        self.qbittorrent_server = os.getenv('QBITTORRENT_SERVER')
+        self.qbittorrent_port = os.getenv('QBITTORRENT_PORT')
+        self.http_s = os.getenv('HTTP_S', 'http')
+
+        # Validate required environment variables
+        required_vars = [
+            'PORT_FORWARDED', 'QBITTORRENT_USER', 'QBITTORRENT_PASS',
+            'QBITTORRENT_SERVER', 'QBITTORRENT_PORT'
+        ]
+
+        missing_vars = [var for var in required_vars if not os.getenv(var)]
+        if missing_vars:
+            raise ValueError(f"Missing required environment variables: {', '.join(missing_vars)}")
+
+    def update_port(self):
+        """Update qBittorrent port from the port file"""
+        try:
+            # Read the port from the file
+            with open(self.port_file, 'r') as f:
+                port = f.read().strip()
+
+            if not port:
+                print(f"Warning: Port file {self.port_file} is empty")
+                return
+
+            # Remove old cookies file
+            if os.path.exists(self.cookies_file):
+                os.remove(self.cookies_file)
+
+            # Login to qBittorrent
+            login_url = f"{self.http_s}://{self.qbittorrent_server}:{self.qbittorrent_port}/api/v2/auth/login"
+            login_data = {
+                'username': self.qbittorrent_user,
+                'password': self.qbittorrent_pass
+            }
+
+            session = requests.Session()
+            login_response = session.post(login_url, data=login_data)
+
+            if login_response.status_code != 200:
+                print(f"Failed to login to qBittorrent: HTTP {login_response.status_code}")
+                return
+
+            # Update port preferences
+            prefs_url = f"{self.http_s}://{self.qbittorrent_server}:{self.qbittorrent_port}/api/v2/app/setPreferences"
+            prefs_data = {
+                'json': f'{{"listen_port": "{port}"}}'
+            }
+
+            prefs_response = session.post(prefs_url, data=prefs_data)
+
+            if prefs_response.status_code == 200:
+                print(f"Successfully updated qbittorrent to port {port}")
+            else:
+                print(f"Failed to update port: HTTP {prefs_response.status_code}")
+
+        except FileNotFoundError:
+            print(f"Couldn't find file {self.port_file}")
+        except Exception as e:
+            print(f"Error updating port: {e}")
+
+    def run(self):
+        """Main loop to monitor port file changes"""
+        observer = Observer()
+        event_handler = PortFileHandler(self)
+
+        while True:
+            if os.path.exists(self.port_file):
+                print(f"Found port file {self.port_file}, starting monitoring...")
+
+                # Initial port update
+                self.update_port()
+
+                # Start file monitoring
+                observer.schedule(event_handler, os.path.dirname(self.port_file), recursive=False)
+                observer.start()
+
+                try:
+                    while True:
+                        time.sleep(1)
+                except KeyboardInterrupt:
+                    observer.stop()
+                    break
+            else:
+                print(f"Couldn't find file {self.port_file}")
+                print("Trying again in 10 seconds")
+                time.sleep(10)
+
+if __name__ == "__main__":
+    try:
+        syncer = QBitTorrentPortSyncer()
+        syncer.run()
+    except KeyboardInterrupt:
+        print("\nShutting down...")
+    except Exception as e:
+        print(f"Error: {e}")
+        exit(1)
\ No newline at end of file