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docker/routlin-dash/app/action_apply_interface.py

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+import os
+
+from flask import Blueprint, request, redirect, flash
+from auth import require_level
+from config_utils import load_core, save_core, verify_core_hash, queued_msg
+import sanitize
+import validation as validate
+
+bp = Blueprint('action_apply_interface', __name__)
+
+_VIEW = '/view/view_general'
+
+
+_EXCLUDE_PREFIXES = ('lo', 'wg', 'docker', 'br-', 'veth',
+                     'tun', 'tap', 'ppp', 'virbr',
+                     'podman', 'vnet', 'macvtap', 'fc-')
+
+def _get_system_interfaces():
+    try:
+        return {
+            n for n in os.listdir('/sys/class/net')
+            if not n.startswith(_EXCLUDE_PREFIXES)
+            and os.path.exists(f'/sys/class/net/{n}/device')
+        }
+    except Exception:
+        return set()
+
+
+@bp.route('/action/apply_interface', methods=['POST'])
+@require_level('administrator')
+def apply_interface():
+    wan = sanitize.interface_name(request.form.get('wan_interface', ''))
+    lan = sanitize.interface_name(request.form.get('lan_interface', ''))
+
+    if not wan or not lan:
+        flash('Both WAN and LAN interfaces are required.', 'error')
+        return redirect(_VIEW)
+
+    if wan == lan:
+        flash('WAN and LAN interfaces must be different.', '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)
+
+    available = _get_system_interfaces()
+    for iface in (wan, lan):
+        if available and iface not in available:
+            flash(f"Interface '{iface}' does not exist on this system.", 'error')
+            return redirect(_VIEW)
+
+    core = load_core()
+    gen  = core.setdefault('general', {})
+    gen['wan_interface'] = wan
+    gen['lan_interface'] = lan
+    errors = validate.validate_config(core)
+    if errors:
+        for msg in errors:
+            flash(msg, 'error')
+        return redirect(_VIEW)
+    save_core(core)
+
+    flash(queued_msg('core apply'), 'success')
+    return redirect(_VIEW)