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Template Transformer

This is Kong plugins that accepts requests and response templates to completely transform requests and responses with Lua templates.

Kong Plugin Template Transformer

For questions, details or contributions, please reach us here.

Configuration Reference

This plugin is not compatible with DB-less mode.

Enable the plugin on a service

For example, configure this plugin on a service by making the following request:

curl -X POST http://{HOST}:8001/services/{SERVICE}/plugins \
    --data "name=kong-plugin-template-transformer"  \
    --data 'config.request_template={ "email": "{{body.user}}", "password": "{{body.password}}" }' \
    --data 'config.response_template={ "status": "{{status}}", "message": "{{body.message}}" }' \
    --data 'config.hidden_fields=["password"]'

SERVICE is the id or name of the service that this plugin configuration will target.

First, create a KongPlugin resource:

apiVersion: configuration.konghq.com/v1
kind: KongPlugin
metadata:
  name: <kong-plugin-template-transformer-example>
config: 
  request_template: '{ "email": "{{body.user}}", "password": "{{body.password}}" }'
  response_template: '{ "status": "{{status}}", "message": "{{body.message}}" }'
  hidden_fields: '["password"]'
plugin: kong-plugin-template-transformer

Next, apply the KongPlugin resource to a Service by annotating the Service as follows:

apiVersion: v1
kind: Service
metadata:
  name: {SERVICE}
  labels:
    app: {SERVICE}
  annotations:
    konghq.com/plugins: <kong-plugin-template-transformer-example>
spec:
  ports:
  - port: 80
    targetPort: 80
    protocol: TCP
    name: {SERVICE}
  selector:
    app: {SERVICE}

{SERVICE} is the id or name of the service that this plugin configuration will target.

Note: The KongPlugin resource only needs to be defined once and can be applied to any service, consumer, or route in the namespace. If you want the plugin to be available cluster-wide, create the resource as a KongClusterPlugin instead of KongPlugin.

For example, configure this plugin on a service by adding this section to your declarative configuration file:

plugins:
- name: kong-plugin-template-transformer
  service: {SERVICE}
  config: 
    request_template: '{ "email": "{{body.user}}", "password": "{{body.password}}" }'
    response_template: '{ "status": "{{status}}", "message": "{{body.message}}" }'
    hidden_fields: '["password"]'

SERVICE is the id or name of the service that this plugin configuration will target.

Enable the plugin on a route

For example, configure this plugin on a route with:

$ curl -X POST http://{HOST}:8001/routes/{ROUTE}/plugins \
    --data "name=kong-plugin-template-transformer"  \
    --data 'config.request_template={ "email": "{{body.user}}", "password": "{{body.password}}" }' \
    --data 'config.response_template={ "status": "{{status}}", "message": "{{body.message}}" }' \
    --data 'config.hidden_fields=["password"]'

ROUTE is the id or name of the route that this plugin configuration will target.

First, create a KongPlugin resource:

apiVersion: configuration.konghq.com/v1
kind: KongPlugin
metadata:
  name: <kong-plugin-template-transformer-example>
config: 
  request_template: '{ "email": "{{body.user}}", "password": "{{body.password}}" }'
  response_template: '{ "status": "{{status}}", "message": "{{body.message}}" }'
  hidden_fields: '["password"]'
plugin: kong-plugin-template-transformer

Then, apply it to an ingress (Route or Routes) by annotating the ingress as follows:

apiVersion: networking/v1beta1
kind: Ingress
metadata:
  name: {ROUTE}
  annotations:
    kubernetes.io/ingress.class: kong
    konghq.com/plugins: <kong-plugin-template-transformer-example>
spec:
  rules:
  - host: examplehostname.com
    http:
      paths:
      - path: /bar
        backend:
          serviceName: echo
          servicePort: 80

ROUTE is the id or name of the route that this plugin configuration will target.

Note: The KongPlugin resource only needs to be defined once and can be applied to any service, consumer, or route in the namespace. If you want the plugin to be available cluster-wide, create the resource as a KongClusterPlugin instead of KongPlugin.

For example, configure this plugin on a route by adding this section to your declarative configuration file:

plugins:
- name: kong-plugin-template-transformer
  route: <route>
  config: 
    request_template: '{ "email": "{{body.user}}", "password": "{{body.password}}" }'
    response_template: '{ "status": "{{status}}", "message": "{{body.message}}" }'
    hidden_fields: '["password"]'

ROUTE is the id or name of the route that this plugin configuration will target.

Enable the plugin globally

A plugin which is not associated to any service, route, or consumer is considered global, and will be run on every request. Read the Plugin Reference and the Plugin Precedence sections for more information.

For example, configure this plugin globally with:

$ curl -X POST http://{HOST}:8001/plugins/ \
    --data "name=kong-plugin-template-transformer"  \
    --data 'config.request_template={ "email": "{{body.user}}", "password": "{{body.password}}" }' \
    --data 'config.response_template={ "status": "{{status}}", "message": "{{body.message}}" }' \
    --data 'config.hidden_fields=["password"]'

Create a KongClusterPlugin resource and label it as global:

apiVersion: configuration.konghq.com/v1
kind: KongClusterPlugin
metadata:
  name: <global-kong-plugin-template-transformer>
  annotations:
    kubernetes.io/ingress.class: kong
  labels:
    global: \"true\"
config: 
  request_template: '{ "email": "{{body.user}}", "password": "{{body.password}}" }'
  response_template: '{ "status": "{{status}}", "message": "{{body.message}}" }'
  hidden_fields: '["password"]'
plugin: kong-plugin-template-transformer

For example, configure this plugin using the plugins: entry in the declarative configuration file:

plugins:
- name: kong-plugin-template-transformer
  config: 
    request_template: '{ "email": "{{body.user}}", "password": "{{body.password}}" }'
    response_template: '{ "status": "{{status}}", "message": "{{body.message}}" }'
    hidden_fields: '["password"]'

Parameters

Here's a list of all the parameters which can be used in this plugin's configuration:

Form Parameter Description
name
required

Type: string		 The name of the plugin, in this case kong-plugin-template-transformer.
service.id

Type: string		 The ID of the Service the plugin targets.
route.id

Type: string		 The ID of the Route the plugin targets.
enabled
required

Type: boolean

Default value: true		 Whether this plugin will be applied.
api_id

Type: string		 The ID of the API the plugin targets.

Note: The API Entity is deprecated in favor of Services since CE 0.13.0 and EE 0.32.
config.request_template

Describes the template to be used for the transformation. Available nginx variables: headers, body, custom_data, route_groups, query_string.
config.response_template

Describes the template to be used for the transformation. Available nginx variables: headers, body, status.
config.hidden_fields

Fields to hide in the nginx logs.