fix: add security guards and type consistency for PR #71

- Add localhost-only guard to /api/open-file (rejects non-localhost with 403)
- Restrict open-file paths to user's home directory
- Change savedFilename/savedFilePath from optional to required-but-nullable
- Remove zip from KNOWN_3D_EXTENSIONS (not a valid 3D format)
- Export getExtensionFromUrl for testability

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/api/open-file/route.ts

@@ -7,7 +7,33 @@ import os from "os";
 
 const execFileAsync = promisify(execFile);
 
+function isLocalhostRequest(req: NextRequest): boolean {
+    const forwarded = req.headers.get("x-forwarded-for");
+    if (forwarded) {
+        const firstIp = forwarded.split(",")[0].trim();
+        if (firstIp !== "127.0.0.1" && firstIp !== "::1" && firstIp !== "::ffff:127.0.0.1") {
+            return false;
+        }
+    }
+
+    const host = req.headers.get("host") || "";
+    const hostname = host.split(":")[0];
+    if (hostname && hostname !== "localhost" && hostname !== "127.0.0.1" && hostname !== "::1") {
+        return false;
+    }
+
+    return true;
+}
+
 export async function POST(req: NextRequest) {
+    // Only allow requests from localhost
+    if (!isLocalhostRequest(req)) {
+        return NextResponse.json(
+            { success: false, error: "Forbidden: localhost only" },
+            { status: 403 }
+        );
+    }
+
     try {
         const body = await req.json();
         const { filePath: inputPath } = body;
@@ -22,6 +48,15 @@ export async function POST(req: NextRequest) {
         // Normalize and resolve the path to prevent traversal attacks
         const normalizedPath = path.resolve(inputPath);
 
+        // Restrict to user's home directory
+        const homeDir = os.homedir();
+        if (!normalizedPath.startsWith(homeDir + path.sep) && normalizedPath !== homeDir) {
+            return NextResponse.json(
+                { success: false, error: "Path is outside allowed directory" },
+                { status: 403 }
+            );
+        }
+
         // Validate that the path exists and is a file
         try {
             const stats = await stat(normalizedPath);

src/app/api/save-generation/route.ts

@@ -49,11 +49,11 @@ function isHttpUrl(str: string): boolean {
 }
 
 // Known file extensions for 3D models and common media
-const KNOWN_3D_EXTENSIONS = new Set(["glb", "gltf", "obj", "fbx", "usdz", "stl", "ply", "zip"]);
+const KNOWN_3D_EXTENSIONS = new Set(["glb", "gltf", "obj", "fbx", "usdz", "stl", "ply"]);
 const KNOWN_MEDIA_EXTENSIONS = new Set(["png", "jpg", "jpeg", "gif", "webp", "svg", "mp4", "webm", "mov"]);
 
 // Helper to extract a recognized file extension from a URL pathname
-function getExtensionFromUrl(url: string): string | null {
+export function getExtensionFromUrl(url: string): string | null {
   try {
     const urlObj = new URL(url);
     const pathname = urlObj.pathname;

src/types/nodes.ts

@@ -183,8 +183,8 @@ export interface Generate3DNodeData extends BaseNodeData {
   inputImageRefs?: string[];
   inputPrompt: string | null;
   output3dUrl: string | null;
-  savedFilename?: string | null;
-  savedFilePath?: string | null;
+  savedFilename: string | null;
+  savedFilePath: string | null;
   selectedModel?: SelectedModel;
   parameters?: Record<string, unknown>;
   inputSchema?: ModelInputDef[];