UI improvement

docker/router-dash/app/action_apply_interface.py

@@ -0,0 +1,63 @@
+import re
+import subprocess
+
+from flask import Blueprint, request, redirect, flash
+from auth import require_level
+from config_utils import load_core, save_core, verify_core_hash, apply_msg
+import sanitize
+
+bp = Blueprint('action_apply_interface', __name__)
+
+_VIEW = '/view/view_general'
+
+
+def _get_system_interfaces():
+    try:
+        r = subprocess.run(['ip', 'link', 'show'], capture_output=True, text=True, timeout=5)
+        names = re.findall(r'^\d+:\s+(\S+):', r.stdout, re.MULTILINE)
+        return {n.split('@')[0] for n in names} - {'lo'}
+    except Exception:
+        return set()
+
+
+@bp.route('/action/apply_interface', methods=['POST'])
+@require_level('administrator')
+def apply_interface():
+    idx_raw   = request.form.get('row_index', '').strip()
+    interface = sanitize.interface_name(request.form.get('interface', ''))
+
+    try:
+        idx = int(idx_raw)
+        if idx not in (0, 1):
+            raise ValueError
+    except (ValueError, TypeError):
+        flash('Invalid request.', 'error')
+        return redirect(_VIEW)
+
+    if not interface:
+        flash('Interface name is required.', 'error')
+        return redirect(_VIEW)
+
+    if not verify_core_hash(request.form.get('config_hash', '')):
+        flash('Configuration was modified by another session. Please refresh and try again.', 'error')
+        return redirect(_VIEW)
+
+    core = load_core()
+    gen  = core.setdefault('general', {})
+
+    other_key = 'lan_interface' if idx == 0 else 'wan_interface'
+    if interface == gen.get(other_key, ''):
+        flash('WAN and LAN interfaces must be different.', 'error')
+        return redirect(_VIEW)
+
+    available = _get_system_interfaces()
+    if available and interface not in available:
+        flash(f"Interface '{interface}' does not exist on this system.", 'error')
+        return redirect(_VIEW)
+
+    key = 'wan_interface' if idx == 0 else 'lan_interface'
+    gen[key] = interface
+    save_core(core)
+
+    flash(apply_msg(), 'success')
+    return redirect(_VIEW)