powertools-request-binding 0.1.0

An extension for AWS Lambda Powertools that provides model binding for request bodies, query parameters and path parameters.

powertools-request-binding

Middleware for AWS Lambda Powertools Event Handler that validates and injects route arguments using Modmex models instead of Pydantic.

Why

Powertools request validation currently requires Pydantic. This package provides a lightweight alternative for request binding in REST API and HTTP API handlers when your project uses Modmex.

Installation

poetry add powertools-request-binding modmex

Usage

from typing import Annotated

from modmex import BaseModel
from aws_lambda_powertools.event_handler import APIGatewayRestResolver

from powertools_request_binding import Body, Query, RequestBindingMiddleware


class CreateTodoRequest(BaseModel):
	title: str
	completed: bool


app = APIGatewayRestResolver()
app.use(middlewares=[RequestBindingMiddleware()])


@app.post("/todos/<todo_id>")
def create_todo(
	todo_id: int,
	payload: Annotated[CreateTodoRequest, Body()],
	source: Annotated[str | None, Query()] = None,
):
	return {
		"todo_id": todo_id,
		"title": payload.title,
		"completed": payload.completed,
		"source": source,
	}

Supported Input Sources

• Path parameters
• Query parameters
• Headers
• JSON body

Notes

• This package focuses on request argument binding only.
• Powertools Depends(...) support remains native and should be used directly from Powertools when needed.