Move JSON response body validation to middleware #1591
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connexion/validators.py
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| await self._send(self._messages.pop(0)) | ||
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| class TextResonseBodyValidator(JSONResponseBodyValidator): |
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Why does the validator for content type text/plain subclass from the JSON validator?
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I assume to maintain compatibility?
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The response body in the spec is defined as a json schema, so we can use jsonschema to validate text/plain responses as well. We can even use json.loads to cast non-string values (eg. json.loads("2.0") = 2.0), but json.loads fails for text strings (eg. json.loads("text")), so we should catch any decode errors.
| VALIDATOR_MAP = { | ||
| "parameter": ParameterValidator, | ||
| "body": {"application/json": JSONRequestBodyValidator}, | ||
| "response": { |
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This has the side-effect that we cannot simply do a .update() on the validator map of a specific instance as it only goes 1 level deep. Currently, still done here:
and
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Good catch. Question is what kind of behavior we want here. I do think we want to update at the top level, as it would otherwise be impossible to remove validators. That just means the user needs to include all validators they want to use in their custom validator_map.
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This PR moves the JSON response body validation to middleware as another step towards #1525.
I moved away from having the body validators implement the complete ASGI interface and calling the next app as mentioned in #1588, as this is not possible for the response validators. We only know the response content type once the response has started, so we can't wrap the validator around the next app.
Instead, the validator now provides a wrapped receive / send callable depending on if it validates either request or response bodies. I updated the request body validator to match this.