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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 compatible with DB-less mode.

Example plugin configuration

The following examples provide some typical configurations for enabling the kong-plugin-template-transformer plugin on a service.

Make the following request:

curl -X POST http://localhost:8001/services/SERVICE_NAME|SERVICE_ID/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"]'

Replace SERVICE_NAME|SERVICE_ID with 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_NAME|SERVICE_ID
  labels:
    app: SERVICE_NAME|SERVICE_ID
  annotations:
    konghq.com/plugins: kong-plugin-template-transformer-example
spec:
  ports:
  - port: 80
    targetPort: 80
    protocol: TCP
    name: SERVICE_NAME|SERVICE_ID
  selector:
    app: SERVICE_NAME|SERVICE_ID

Replace SERVICE_NAME|SERVICE_ID with 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.

Add this section to your declarative configuration file:

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

Replace SERVICE_NAME|SERVICE_ID with the id or name of the service that this plugin configuration will target.

The following examples provide some typical configurations for enabling the kong-plugin-template-transformer plugin on a route.

Make the following request:

curl -X POST http://localhost:8001/routes/ROUTE_NAME|ROUTE_ID/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"]'

Replace ROUTE_NAME|ROUTE_ID with 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.k8s.io/v1
kind: Ingress
metadata:
  name: ROUTE_NAME|ROUTE_ID
  annotations:
    kubernetes.io/ingress.class: kong
    konghq.com/plugins: kong-plugin-template-transformer-example
spec:
  rules:
  - host: examplehostname.com
    http:
      paths:
      - path: /bar
        backend:
          service:
            name: echo
            port:
              number: 80

Replace ROUTE_NAME|ROUTE_ID with 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.

Add this section to your declarative configuration file:

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

Replace ROUTE_NAME|ROUTE_ID with the id or name of the route that this plugin configuration will target.

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.

The following examples provide some typical configurations for enabling the kong-plugin-template-transformer plugin globally.

Make the following request:

curl -X POST http://localhost: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

Add a 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.name or service.id

Type: string		 The name or ID of the service the plugin targets.

Set one of these parameters if adding the plugin to a service through the top-level /plugins endpoint.

Not required if using /services/SERVICE_NAME|SERVICE_ID/plugins.
route.name or route.id

Type: string		 The name or ID of the route the plugin targets.

Set one of these parameters if adding the plugin to a route through the top-level /plugins endpoint.

Not required if using /routes/ROUTE_NAME|ROUTE_ID/plugins.
enabled

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.