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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def create_authorization_response(self, uri, http_method='GET', body=None, headers=None, realms=None, credentials=None):
 """Create an authorization response, with a new request token if valid. :param uri: The full URI of the token request. :param http_method: A valid HTTP verb, i.e. GET, POST, PUT, HEAD, etc. :param body: The request body as a string. :param headers: The request headers as a dict. :param credentials: A list of credentials to include in the verifier. :returns: A tuple of 3 elements. 1. A dict of headers to set on the response. 2. The response body as a string. 3. The response status code as an integer. If the callback URI tied to the current token is "oob", a response with a 200 status code will be returned. In this case, it may be desirable to modify the response to better display the verifier to the client. An example of an authorization request:: None 302 An example of a request with an "oob" callback:: {'Content-Type': 'application/x-www-form-urlencoded'} 200 """

        request = self._create_request(uri, http_method=http_method, body=body,
                                       headers=headers)

        if not request.resource_owner_key:
            raise errors.InvalidRequestError(
                'Missing mandatory parameter oauth_token.')
        if not self.request_validator.verify_request_token(
                request.resource_owner_key, request):
            raise errors.InvalidClientError()

        request.realms = realms
        if (request.realms and not self.request_validator.verify_realms(
                request.resource_owner_key, request.realms, request)):
            raise errors.InvalidRequestError(
                description=('User granted access to realms outside of '
                             'what the client may request.'))

        verifier = self.create_verifier(request, credentials or {})
        redirect_uri = self.request_validator.get_redirect_uri(
            request.resource_owner_key, request)
        if redirect_uri == 'oob':
            response_headers = {
                'Content-Type': 'application/x-www-form-urlencoded'}
            response_body = urlencode(verifier)
            return response_headers, response_body, 200
        else:
            populated_redirect = add_params_to_uri(
                redirect_uri, verifier.items())
            return {'Location': populated_redirect}, None, 302