TrafaretValidator

Install:

pip install trafaret_validator

This is a wrapper that validate params using Trafaret ( http://trafaret.readthedocs.org/en/latest/ ).

Usage:

import trafaret as t
from trafaret_validator import TrafaretValidator


def foo_validator(value):
    if value != 'foo':
        return t.DataError('Expected foo!')
    return 'foo'


class RequestValidator(TrafaretValidator):
    ids = t.List(t.Int)
    payload = t.Dict(foo=t.Call(foo_validator))

validator = RequestValidator(ids=ids, payload=payload)
if not validator.validate():
    return validator.errors

request_params = {'ids' ids, 'payload': payload}
validator = RequestValidator()
if not validator.validate_params(request_params):
    return validator.errors

data = validator.data # returns checked dict of params {'ids': [...], 'payload': {'foo': 'foo'}}
ids = validator.ids
payload = validator.payload