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69 lines
2.2 KiB
Python
69 lines
2.2 KiB
Python
# Copyright (c) Meta Platforms, Inc. and affiliates.
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# All rights reserved.
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#
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# This source code is licensed under the terms described in the LICENSE file in
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# the root directory of this source tree.
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import json
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from fastapi import Request
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from pydantic import BaseModel, ValidationError
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from llama_stack.apis.files import ExpiresAfter
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async def parse_pydantic_from_form[T: BaseModel](request: Request, field_name: str, model_class: type[T]) -> T | None:
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"""
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Generic parser to extract a Pydantic model from multipart form data.
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Handles both bracket notation (field[attr1], field[attr2]) and JSON string format.
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Args:
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request: The FastAPI request object
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field_name: The name of the field in the form data (e.g., "expires_after")
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model_class: The Pydantic model class to parse into
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Returns:
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An instance of model_class if parsing succeeds, None otherwise
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Example:
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expires_after = await parse_pydantic_from_form(
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request, "expires_after", ExpiresAfter
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)
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"""
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form = await request.form()
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# Check for bracket notation first (e.g., expires_after[anchor], expires_after[seconds])
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bracket_data = {}
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prefix = f"{field_name}["
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for key in form.keys():
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if key.startswith(prefix) and key.endswith("]"):
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# Extract the attribute name from field_name[attr]
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attr = key[len(prefix) : -1]
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bracket_data[attr] = form[key]
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if bracket_data:
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try:
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return model_class(**bracket_data)
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except (ValidationError, TypeError):
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pass
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# Check for JSON string format
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if field_name in form:
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value = form[field_name]
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if isinstance(value, str):
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try:
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data = json.loads(value)
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return model_class(**data)
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except (json.JSONDecodeError, TypeError, ValidationError):
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pass
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return None
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async def parse_expires_after(request: Request) -> ExpiresAfter | None:
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"""
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Dependency to parse expires_after from multipart form data.
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Handles both bracket notation (expires_after[anchor], expires_after[seconds])
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and JSON string format.
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"""
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return await parse_pydantic_from_form(request, "expires_after", ExpiresAfter)
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