Fix: Use HF_TOKEN secret for dataset contributions

app.py

@@ -34,11 +34,15 @@ def get_device_info():
 
 def contribute_to_dataset(features, labels, num_legit, num_cheaters, seed):
     try:
-        from huggingface_hub import HfApi, upload_file
+        from huggingface_hub import HfApi
         import tempfile
         import os
         
-        api = HfApi()
+        hf_token = os.environ.get("HF_TOKEN")
+        if not hf_token:
+            return False, "HF_TOKEN not configured"
+        
+        api = HfApi(token=hf_token)
         
         contribution_id = f"{datetime.now().strftime('%Y%m%d_%H%M%S')}_{uuid.uuid4().hex[:8]}"
         
@@ -62,9 +66,9 @@ def contribute_to_dataset(features, labels, num_legit, num_cheaters, seed):
             with open(meta_path, "w") as f:
                 json.dump(metadata, f, indent=2)
             
-            upload_file(path_or_fileobj=features_path, path_in_repo=f"contributions/features_{contribution_id}.npy", repo_id=DATASET_REPO, repo_type="dataset")
-            upload_file(path_or_fileobj=labels_path, path_in_repo=f"contributions/labels_{contribution_id}.npy", repo_id=DATASET_REPO, repo_type="dataset")
-            upload_file(path_or_fileobj=meta_path, path_in_repo=f"contributions/meta_{contribution_id}.json", repo_id=DATASET_REPO, repo_type="dataset")
+            api.upload_file(path_or_fileobj=features_path, path_in_repo=f"contributions/features_{contribution_id}.npy", repo_id=DATASET_REPO, repo_type="dataset")
+            api.upload_file(path_or_fileobj=labels_path, path_in_repo=f"contributions/labels_{contribution_id}.npy", repo_id=DATASET_REPO, repo_type="dataset")
+            api.upload_file(path_or_fileobj=meta_path, path_in_repo=f"contributions/meta_{contribution_id}.json", repo_id=DATASET_REPO, repo_type="dataset")
         
         return True, contribution_id
     except Exception as e: