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Kong

Template Transformer

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

Terminology

  • plugin: a plugin executing actions inside Kong before or after a request has been proxied to the upstream API.
  • Service: the Kong entity representing an external upstream API or microservice.
  • Route: the Kong entity representing a way to map downstream requests to upstream services.
  • upstream service: this refers to your own API/service sitting behind Kong, to which client requests are forwarded.
  • API: a legacy entity used to represent your upstream services. Deprecated in favor of Services since CE 0.13.0 and EE 0.32.

Configuration

Enabling the plugin on a Service

Configure this plugin on a Service by making the following request:

$ curl -X POST http://kong: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: the id or name of the Service that this plugin configuration will target.

Enabling the plugin on a Route

Configure this plugin on a Route with:

$ curl -X POST http://kong:8001/routes/{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"]'"
  • route_id: the id of the Route that this plugin configuration will target.

Enabling the plugin on an API

If you are using an older version of Kong with the legacy API entity (deprecated in favor of Services since CE 0.13.0 and EE 0.32.), you can configure this plugin on top of such an API by making the following request:

$ curl -X POST http://kong:8001/apis/{api}/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"]'"
  • api: either id or name of the API that this plugin configuration will target.

Global plugins

All plugins can be configured using the http://kong:8001/plugins/ endpoint. A plugin which is not associated to any Service, Route or Consumer (or API, if you are using an older version of Kong) is considered "global", and will be run on every request. Read the Plugin Reference and the Plugin Precedence sections for more information.

Parameters

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

form parameterdefaultdescription
nameThe name of the plugin to use, in this case kong-plugin-template-transformer
service_idThe id of the Service which this plugin will target.
route_idThe id of the Route which this plugin will target.
enabledtrueWhether this plugin will be applied.
api_idThe id of the API which this plugin will target. 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.

Kong Plugin Template Transformer

For questions, details or contributions, please reach us at https://github.com/stone-payments/kong-plugin-template-transformer