[Serializer] Handle invalid mapping type property type #60296
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When using
#[MapRequestPayload]along with a type that uses a#[DescriminatorMap]it's possible for a user to craft a payload that triggers aTypeErrorby passing the wrong type for the "type" property.For example, a class that has:
and a request comes in with:
will trigger a 500 because
AbstractObjectNormalizerdoesn't validate the field type before passing it to->getClassForTypewhich typehints for string.This PR adds a conditional that filters anything other than strings or objects that have a __toString method.