AWS Route 53 and API Gateway Dynamic DNS

apigateway.yaml

---
swagger: "2.0"
info:
  version: "2020-07-26T11:46:42Z"
  title: "DynamicDNS"
host: "ddns.example.com"
schemes:
- "https"
paths:
  /{zone_id}:
    get:
      consumes:
      - "application/json"
      produces:
      - "application/json"
      parameters:
      - name: "zone_id"
        in: "path"
        required: true
        type: "string"
      responses:
        200:
          description: "200 response"
          schema:
            $ref: "#/definitions/Empty"
      x-amazon-apigateway-integration:
        credentials: "arn:aws:iam::ACCOUNT_NUMBER:role/DynamicDNS"
        uri: "arn:aws:apigateway:eu-west-1:route53:path/2013-04-01/hostedzone/{hosted_zone_id}/rrset/"
        responses:
          default:
            statusCode: "200"
        requestParameters:
          integration.request.path.hosted_zone_id: "method.request.path.zone_id"
          integration.request.header.Content-Type: "'application/xml'"
        requestTemplates:
          application/json: "<ChangeResourceRecordSetsRequest xmlns=\"https://route53.amazonaws.com/doc/2013-04-01/\"\
            >\n    <ChangeBatch>\n        <Changes>\n            <Change>\n      \
            \          <Action>UPSERT</Action>\n                <ResourceRecordSet>\n\
            \                    <Name>$input.params('hostname')</Name>\n        \
            \            <Type>A</Type>\n                    <TTL>60</TTL>\n     \
            \               <ResourceRecords>\n                        <ResourceRecord>\n\
            \                            <Value>$context.identity.sourceIp</Value>\n\
            \                        </ResourceRecord>\n                    </ResourceRecords>\n\
            \                </ResourceRecordSet>\n            </Change>\n       \
            \ </Changes>\n    </ChangeBatch>\n</ChangeResourceRecordSetsRequest>"
        passthroughBehavior: "never"
        httpMethod: "POST"
        type: "aws"
definitions:
  Empty:
    type: "object"
    title: "Empty Schema"

iam_role_policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "route53:ChangeResourceRecordSets"
            ],
            "Resource": [
                "arn:aws:route53:::hostedzone/*"
            ]
        }
    ]
}