UUID is not JSON serializable when running in taxii2 mode

[zentavr]

Hi,

When doing the request like this:

curl --user "rst:pS4vH" https://stix2.***.com/taxii2/d593ad8f-15b9-450e-bc9a-10317165b6c8/collections/

I have an error like this:

[2022-10-07 02:34:37 +0200] [153840] [ERROR] Error handling request /taxii2/d593ad8f-15b9-450e-bc9a-10317165b6c8/collections/
Traceback (most recent call last):
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 2525, in wsgi_app
    response = self.full_dispatch_request()
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 1822, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 1820, in full_dispatch_request
    rv = self.dispatch_request()
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 1796, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/opentaxii/server.py", line 909, in handle_request
    return endpoint()
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/opentaxii/server.py", line 475, in handle_request
    return endpoint()
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/opentaxii/utils.py", line 343, in inner
    return method(*args, **kwargs)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/opentaxii/server.py", line 552, in collections_handler
    return make_taxii2_response(response)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/opentaxii/taxii2/http.py", line 11, in make_taxii2_response
    data = json.dumps(data)
  File "/usr/lib/python3.10/json/__init__.py", line 231, in dumps
    return _default_encoder.encode(obj)
  File "/usr/lib/python3.10/json/encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/usr/lib/python3.10/json/encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
  File "/usr/lib/python3.10/json/encoder.py", line 179, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type UUID is not JSON serializable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/gunicorn/workers/sync.py", line 136, in handle
    self.handle_request(listener, req, client, addr)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/gunicorn/workers/sync.py", line 179, in handle_request
    respiter = self.wsgi(environ, resp.start_response)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 2548, in __call__
    return self.wsgi_app(environ, start_response)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 2528, in wsgi_app
    response = self.handle_exception(e)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 1726, in handle_exception
    return self.finalize_request(server_error, from_error_handler=True)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 1842, in finalize_request
    response = self.make_response(rv)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 2134, in make_response
    raise TypeError(
TypeError: The view function for 'opentaxii_services_view' did not return a valid response. The function either returned None or ended without a return statement.
[2022-10-07 02:34:44 +0200] [153865] [ERROR] Error handling request /taxii2/d593ad8f-15b9-450e-bc9a-10317165b6c8/collections/
Traceback (most recent call last):
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 2525, in wsgi_app
    response = self.full_dispatch_request()
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 1822, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 1820, in full_dispatch_request
    rv = self.dispatch_request()
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 1796, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/opentaxii/server.py", line 909, in handle_request
    return endpoint()
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/opentaxii/server.py", line 475, in handle_request
    return endpoint()
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/opentaxii/utils.py", line 343, in inner
    return method(*args, **kwargs)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/opentaxii/server.py", line 552, in collections_handler
    return make_taxii2_response(response)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/opentaxii/taxii2/http.py", line 11, in make_taxii2_response
    data = json.dumps(data)
  File "/usr/lib/python3.10/json/__init__.py", line 231, in dumps
    return _default_encoder.encode(obj)
  File "/usr/lib/python3.10/json/encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/usr/lib/python3.10/json/encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
  File "/usr/lib/python3.10/json/encoder.py", line 179, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type UUID is not JSON serializable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/gunicorn/workers/sync.py", line 136, in handle
    self.handle_request(listener, req, client, addr)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/gunicorn/workers/sync.py", line 179, in handle_request
    respiter = self.wsgi(environ, resp.start_response)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 2548, in __call__
    return self.wsgi_app(environ, start_response)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 2528, in wsgi_app
    response = self.handle_exception(e)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 1726, in handle_exception
    return self.finalize_request(server_error, from_error_handler=True)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 1842, in finalize_request
    response = self.make_response(rv)
  File "/opt/.otvenv-taxii2/lib/python3.10/site-packages/flask/app.py", line 2134, in make_response
    raise TypeError(
TypeError: The view function for 'opentaxii_services_view' did not return a valid response. The function either returned None or ended without a return statement.

What might be the issue?
Running 0.9.2 from pip.

[andrewbeard]

This issue blocks a good portion of the TAXII2 functionality. I put a PR in for the same thing before realizing there was an existing issue (and PR). Can someone please take a look at one of the PRs as this is a showstopper for pretty much any TAXII2 user.