feat: lock down plugin runtime in sandbox + signing + approval

app/api/admin/plugins/[id]/bundle/route.ts

@@ -1,6 +1,11 @@
 import { NextRequest, NextResponse } from 'next/server';
 import { getPluginBundle, getPlugin } from '@/lib/admin/plugin-registry';
 import { getDevPlugin, readDevBundle } from '@/lib/admin/plugin-dev';
+import { signBytes } from '@/lib/admin/plugin-signing';
+
+async function safeSign(code: string): Promise<string | null> {
+  try { return await signBytes(code); } catch { return null; }
+}
 
 /**
  * GET /api/admin/plugins/[id]/bundle - Serve plugin JS bundle
@@ -25,14 +30,15 @@ export async function GET(
     const devEntry = await getDevPlugin(id);
     if (devEntry) {
       const code = await readDevBundle(devEntry);
-      return new NextResponse(code, {
-        headers: {
-          'Content-Type': 'application/javascript; charset=utf-8',
-          'Cache-Control': 'no-store',
-          'ETag': `"${devEntry.plugin.bundleHash}"`,
-          'Content-Length': String(Buffer.byteLength(code, 'utf-8')),
-        },
-      });
+      const signature = await safeSign(code);
+      const headers: Record<string, string> = {
+        'Content-Type': 'application/javascript; charset=utf-8',
+        'Cache-Control': 'no-store',
+        'ETag': `"${devEntry.plugin.bundleHash}"`,
+        'Content-Length': String(Buffer.byteLength(code, 'utf-8')),
+      };
+      if (signature) headers['X-Bundle-Signature'] = signature;
+      return new NextResponse(code, { headers });
     }
 
     const plugin = await getPlugin(id);
@@ -59,6 +65,9 @@ export async function GET(
     };
     if (etag) headers['ETag'] = etag;
 
+    const signature = await safeSign(code);
+    if (signature) headers['X-Bundle-Signature'] = signature;
+
     if (etag && request.headers.get('if-none-match') === etag) {
       return new NextResponse(null, { status: 304, headers });
     }

app/api/admin/plugins/route.ts

@@ -12,6 +12,7 @@ import { listDevPlugins } from '@/lib/admin/plugin-dev';
 import {
   sanitizeFrameOrigins,
   sanitizeHttpOrigins,
+  sanitizeApiPostPaths,
   invalidateFrameOriginsCache,
 } from '@/lib/admin/csp-frame-origins';
 
@@ -172,6 +173,7 @@ export async function POST(request: NextRequest) {
 
     const declaredFrameOrigins = sanitizeFrameOrigins(manifest.frameOrigins);
     const declaredHttpOrigins = sanitizeHttpOrigins(manifest.httpOrigins);
+    const declaredApiPostPaths = sanitizeApiPostPaths(manifest.apiPostPaths);
 
     const now = new Date().toISOString();
     const plugin: ServerPlugin = {
@@ -196,13 +198,16 @@ export async function POST(request: NextRequest) {
       ...(declaredHttpOrigins.length > 0
         ? { httpOrigins: declaredHttpOrigins }
         : {}),
+      ...(declaredApiPostPaths.length > 0
+        ? { apiPostPaths: declaredApiPostPaths }
+        : {}),
       installedAt: now,
       updatedAt: now,
     };
 
     await savePlugin(plugin, code);
     invalidateFrameOriginsCache();
-    await auditLog('plugin.install', { id: plugin.id, name: plugin.name, version: plugin.version, frameOrigins: declaredFrameOrigins, httpOrigins: declaredHttpOrigins }, ip);
+    await auditLog('plugin.install', { id: plugin.id, name: plugin.name, version: plugin.version, frameOrigins: declaredFrameOrigins, httpOrigins: declaredHttpOrigins, apiPostPaths: declaredApiPostPaths }, ip);
 
     return NextResponse.json({ plugin });
   } catch (error) {