Bug: Incomplete validation of annotated parameter types (3.21.0 regression) #7600
Description
Expected Behaviour
Annotated parameter types using annotated_types should be validated by Pydantic. This used to work, but regressed starting from 3.21.0. Types are still validated, but constraint annotations are not.
I thought #7227 would have enabled using Pydantic Field annotations for this use case, and tried to switch to that, but that also doesn't work (in any Powertools version). Should I report this separately (perhaps as a feature request)?
Current Behaviour
Parameter types are validated, but constraints expressed using annotated_types are not enforced. Handler functions can be called with invalid parameter values.
Code snippet
from http import HTTPStatus
from typing import Annotated
from aws_lambda_powertools.event_handler import APIGatewayHttpResolver
from aws_lambda_powertools.event_handler.openapi.params import Body, Query
import pytest
# aws-lambda-powertools 3.20.0: ok
# aws-lambda-powertools 3.21.0 and 3.22.0: fail (value outside of range allowed)
from annotated_types import Interval
ConstrainedInt = Annotated[int, Interval(ge=0, le=100)]
# aws-lambda-powertools 3.20.0 and 3.21.0 and 3.22.0: error (Only one FieldInfo can be used per parameter)
#from pydantic.fields import Field
#ConstrainedInt = Annotated[int, Field(ge=0, le=100)]
app = APIGatewayHttpResolver(enable_validation=True)
@app.post('/body')
def handle_body(value: Annotated[ConstrainedInt, Body()]) -> None:
assert isinstance(value, int)
assert value >= 0
assert value <= 100
@app.post('/query')
def handle_body(value: Annotated[ConstrainedInt, Query()]) -> None:
assert isinstance(value, int)
assert value >= 0
assert value <= 100
def handler(event, context):
return app.resolve(event, context)
params = [
(0, HTTPStatus.OK),
(50, HTTPStatus.OK),
(100, HTTPStatus.OK),
(-1, HTTPStatus.UNPROCESSABLE_ENTITY),
(101, HTTPStatus.UNPROCESSABLE_ENTITY),
('not an int', HTTPStatus.UNPROCESSABLE_ENTITY),
]
@pytest.mark.parametrize('value,expected_status', params)
def test_handle_body(value, expected_status):
event = {
'rawPath': '/body',
'requestContext': {
'http': {
'method': 'POST'
},
'stage': '$default'
},
'body': str(value)
}
response = handler(event, object())
assert expected_status == response['statusCode']
@pytest.mark.parametrize('value,expected_status', params)
def test_handle_query(value, expected_status):
event = {
'rawPath': '/query',
'requestContext': {
'http': {
'method': 'POST'
},
'stage': '$default'
},
'queryStringParameters': {
'value': str(value)
}
}
response = handler(event, object())
assert expected_status == response['statusCode']Possible Solution
No response
Steps to Reproduce
Run code snippet: pytest test_annotated_types.py
Powertools for AWS Lambda (Python) version
3.21.0, 3.22.0
AWS Lambda function runtime
3.11
Packaging format used
Lambda Layers