fix(expires_after): make sure multipart/form-data is properly parsed

llama_stack/providers/utils/files/form_data.py

@@ -0,0 +1,41 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+from fastapi import Request
+
+from llama_stack.apis.files import ExpiresAfter
+
+
+async def parse_expires_after(request: Request) -> ExpiresAfter | None:
+    """
+    Dependency to parse expires_after from multipart form data.
+    Handles both bracket notation (expires_after[anchor], expires_after[seconds])
+    and JSON string format.
+    """
+    form = await request.form()
+
+    # Check for bracket notation first
+    anchor_key = "expires_after[anchor]"
+    seconds_key = "expires_after[seconds]"
+
+    if anchor_key in form and seconds_key in form:
+        anchor = form[anchor_key]
+        seconds = form[seconds_key]
+        return ExpiresAfter(anchor=anchor, seconds=int(seconds))
+
+    # Check for JSON string format
+    if "expires_after" in form:
+        value = form["expires_after"]
+        if isinstance(value, str):
+            import json
+
+            try:
+                data = json.loads(value)
+                return ExpiresAfter(**data)
+            except (json.JSONDecodeError, TypeError):
+                pass
+
+    return None