From 8ccb7d21ddea652583bc59bf77e85a7f90a11b05 Mon Sep 17 00:00:00 2001
From: Helva <helva@mcf.at>
Date: Sat, 14 Feb 2026 11:21:26 +0100
Subject: [PATCH] added redirect service

---
 README.md                                | 13 ++++++++-----
 face/etc/nginx/sites-available/face      |  8 ++++++++
 face/etc/systemd/system/redirect.service | 17 +++++++++++++++++
 face/opt/face/face_server.py             | 10 ++++++++++
 face/opt/face/redirect_tethering_ip.py   | 14 ++++++++++++++
 5 files changed, 57 insertions(+), 5 deletions(-)
 create mode 100644 face/etc/systemd/system/redirect.service
 create mode 100755 face/opt/face/redirect_tethering_ip.py

diff --git a/README.md b/README.md
index 6c5511e..30a583b 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ We build a robot with raspberry and arduino.
 
     python3 -m venv /opt/face/venv
     /opt/face/venv/bin/pip install --upgrade pip
-    /opt/face/venv/bin/pip install fastapi uvicorn
+    /opt/face/venv/bin/pip install fastapi uvicorn netifaces
 
 ### Exchange Nginx Web-Folder
     sudo rm -r /var/www/html
@@ -73,18 +73,21 @@ http://pi-ip/
     curl -X POST http://<pi>/api/state -H "Content-Type: application/json" \
       -d '{"emotion":"happy","blink":true,"intensity":0.85}'
 
-### systemd Service
+### systemd Services
     sudo ln -s /opt/helva-robot/face/etc/systemd/system/face.service /etc/systemd/system/
+    sudo ln -s /opt/helva-robot/face/etc/systemd/system/redirect_to_tethering.service /etc/systemd/system/
 
-    sudo chown -R www-data:www-data /opt/face
-    sudo chmod -R 755 /opt/face
+    sudo chown -R www-data:www-data /opt/face/*.py
+    sudo chmod -R 755 /opt/face/*.py
 
-Start:
+### Start:
 
     sudo systemctl daemon-reload
     sudo systemctl enable --now face.service
     sudo systemctl status face.service --no-pager
 
+    
+
 ### Face Control UI
     http://localhost/control/
 
diff --git a/face/etc/nginx/sites-available/face b/face/etc/nginx/sites-available/face
index d3b742c..d1b0048 100644
--- a/face/etc/nginx/sites-available/face
+++ b/face/etc/nginx/sites-available/face
@@ -2,6 +2,14 @@ server {
     listen 80;
     server_name _;
 
+    # redirect service to tethering IP for 'webview kiosk' -> mobile phone to face
+    location /redirect {
+        proxy_pass http://127.0.0.1:8000/redirect;
+	proxy_set_header Host $host;
+	proxy_set_header X-Real-IP $remote_addr;
+	proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    }
+
     # captive portal to face
     include /opt/helva-robot/drive/etc/nginx/snippets/captive-portal.conf;
 
diff --git a/face/etc/systemd/system/redirect.service b/face/etc/systemd/system/redirect.service
new file mode 100644
index 0000000..0e76c5e
--- /dev/null
+++ b/face/etc/systemd/system/redirect.service
@@ -0,0 +1,17 @@
+[Unit]
+Description=Redirect Tethering IP Service
+After=network.target
+
+[Service]
+WorkingDirectory=/opt/face
+ExecStart=/opt/face/venv/bin/python -m uvicorn redirect_tethering_ip:app --host 127.0.0.1 --port 8000 --app-dir /opt/face
+Restart=always
+RestartSec=1
+
+# Tipp: eigener User ist sauber, aber www-data geht auch.
+User=www-data
+Group=www-data
+
+[Install]
+WantedBy=multi-user.target
+
diff --git a/face/opt/face/face_server.py b/face/opt/face/face_server.py
index e03247c..31c49b0 100755
--- a/face/opt/face/face_server.py
+++ b/face/opt/face/face_server.py
@@ -66,6 +66,10 @@ async def broadcast() -> None:
 async def get_state():
     return JSONResponse(STATE)
 
+@app.get("/api/state")
+async def get_state():
+    return JSONResponse(STATE)
+
 
 @app.post("/state")
 async def set_state(payload: Dict[str, Any]):
@@ -73,6 +77,12 @@ async def set_state(payload: Dict[str, Any]):
     await broadcast()
     return JSONResponse({"ok": True, "state": STATE})
 
+@app.post("/api/state")
+async def set_state(payload: Dict[str, Any]):
+    merge_state(payload)
+    await broadcast()
+    return JSONResponse({"ok": True, "state": STATE})
+
 
 @app.get("/events")
 async def events(request: Request):
diff --git a/face/opt/face/redirect_tethering_ip.py b/face/opt/face/redirect_tethering_ip.py
new file mode 100755
index 0000000..853f2c5
--- /dev/null
+++ b/face/opt/face/redirect_tethering_ip.py
@@ -0,0 +1,14 @@
+from fastapi import FastAPI
+from fastapi.responses import RedirectResponse
+import netifaces
+
+app = FastAPI()
+
+@app.get("/redirect")
+def redirect_to_pi():
+  # gather tethering IP
+  interface = 'usb0'
+  ip_address = netifaces.ifaddresses(interface)[netifaces.AF_INET][0]['addr']
+
+  # relocate to current tethering-IP
+  return RedirectResponse(url=f'http://{ip_address}:80')