[eric] swarm: scan workspace file bytes for secrets on export, not just payload keys

backend/apps/swarm/redact.py

@@ -79,3 +79,21 @@ def find_denied_keys(value: Any, _path: str = "") -> list[str]:
         for i, v in enumerate(value):
             found.extend(find_denied_keys(v, f"{_path}[{i}]"))
     return found
+
+
+def _looks_secret(text: str) -> bool:
+    return any(pat.search(text) for pat in _CONTENT_PATTERNS)
+
+
+def find_secrets_in_files(files: dict[str, bytes]) -> list[str]:
+    """Paths of any file whose text body holds a secret-shaped literal. Payloads
+    get scrubbed key-and-content, but raw workspace files (an app's source) were
+    only key-scanned, so a key hardcoded in a .js would slip. Binary files are
+    skipped (a null byte means it isn't text someone pasted a token into)."""
+    hits: list[str] = []
+    for path, data in files.items():
+        if b"\x00" in data[:4096]:
+            continue
+        if _looks_secret(data.decode("utf-8", errors="ignore")):
+            hits.append(path)
+    return hits

backend/apps/swarm/ziputil.py

@@ -12,7 +12,7 @@ import shutil
 import tempfile
 import zipfile
 
-from .redact import find_denied_keys
+from .redact import find_denied_keys, find_secrets_in_files
 
 MANIFEST_NAME = "manifest.json"
 
@@ -46,6 +46,12 @@ def pack(manifest: dict, payloads: dict[str, dict], files: dict[str, bytes]) ->
             raise BundleError(
                 f"refusing to export: secret-shaped field(s) in {bid}: {leaked[:3]}"
             )
+    leaky_files = find_secrets_in_files(files)
+    if leaky_files:
+        raise BundleError(
+            f"refusing to export: a secret-shaped value is in {leaky_files[0]}; "
+            "remove it (use an environment variable) and try again"
+        )
     entries: dict[str, bytes] = {}
     for bid, payload in payloads.items():
         entries[f"entities/{bid}/payload.json"] = json.dumps(payload, indent=2).encode("utf-8")

backend/tests/test_swarm_bundle.py

@@ -99,6 +99,19 @@ def test_pack_refuses_denied_key():
         pack({"format_version": 1}, {"bid1": {"api_key": "leak"}}, {})
 
 
+def test_pack_refuses_secret_in_workspace_file():
+    # A key hardcoded in app source (not .env) must not ride along; pack scans
+    # file bytes, not just payload keys.
+    leak = b"const KEY = 'sk-ant-api03-AAAAAAAAAAAAAAAAAAAAAAAA';\n"
+    with pytest.raises(BundleError):
+        pack({"format_version": 1}, {"bid1": {"name": "ok"}}, {"entities/bid1/files/config.js": leak})
+
+
+def test_pack_allows_clean_workspace_file():
+    raw = pack({"format_version": 1}, {"bid1": {"name": "ok"}}, {"entities/bid1/files/app.js": b"export default 1"})
+    assert zipfile.is_zipfile(io.BytesIO(raw))
+
+
 def test_app_export_drops_machine_env(tmp_path, monkeypatch):
     # The live .env holds the source machine's absolute paths + pinned port; it
     # must never ride along. .env.example (portable) does.