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Add streaming field limits to `FormParser`

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#332 0 条评论 0 个 reaction 已指派 0 人 在 GitHub 查看

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@Kludex 已经在做这个了。

开始于 2026年10月4日。

  • #333 来自 @Kludex —— 未关闭

评估

难度
4/5
预计耗时
3-5 天
新手友好度
30/100
Issue 类型
功能
描述清晰度
基本清楚
活跃度
停滞
技术栈
python
领域
backend

调研方向

Start by reading FormParser and QuerystringParser, then inspect linked pull request #333 for the work already underway. Verify behavior across chunk boundaries and finalize(), with limits disabled by default and parser exceptions on exceeded field-count or field-size limits.

由索引模型根据 Issue 内容生成。

描述

FormParser already assembles URL-encoded fields and exposes an on_field callback, but it has no field-count or per-field size limits. MAX_BODY_SIZE cannot express these limits, and checking field size in on_field is too late: the field has already been buffered.

Add optional limits for the number of fields and the combined raw name/value size of each URL-encoded field. Enforce size limits before buffering the incoming bytes, raise a parser exception when a limit is exceeded, and leave limits disabled by default for compatibility. Enforcement must work across chunk boundaries and include the final field emitted by finalize().

Starlette currently implements these limits and field assembly around QuerystringParser, including a message queue. Upstream limits would let it reuse FormParser and remove that duplicated assembly and queue-draining logic. Context: starlette#3599. This is a feature request, not a finalization bug in python-multipart; the caller would still call finalize() after stream exhaustion.

主要语言
Python
星标
537
派生
104
平均合并
3 小时
30 天内合并 PR
4

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  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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