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Kong Spec Expose

This plugin will expose the OpenAPI Spec (OAS), Swagger, or other specification of auth protected API services fronted by the Kong gateway.

API providers need a means of exposing the specifications of their services while maintaining authentication on the service itself - this plugin solves this problem by:

  1. Plugin enables Kong Admin to specify the endpoint of their API specification.

  2. Plugin will validate the Proxy request is GET method, and will validate the proxy request ends with “/specz”. If these two requirements are met, the endpoint will return the specification of the API Service with Content-Type header identical to what the API Service exposes.

Installation

Recommended:

$ luarocks install kong-spec-expose

Other:

$ git clone https://github.com/Optum/kong-spec-expose.git /path/to/kong/plugins/kong-spec-expose
$ cd /path/to/kong/plugins/kong-spec-expose
$ luarocks make *.rockspec

Maintainers

jeremyjpj0916
rsbrisci

Feel free to open issues, or refer to our Contribution Guidelines if you have any questions.

Configuration Reference

This plugin is compatible with DB-less mode.

In DB-less mode, you configure Kong Gateway declaratively. Therefore, the Admin API is mostly read-only. The only tasks it can perform are all related to handling the declarative config, including:

  • setting a target's health status in the load balancer
  • validating configurations against schemas
  • uploading the declarative configuration using the /config endpoint

Enable the plugin on a service

Admin API
Kubernetes
Declarative (YAML)

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-spec-expose"  \
    --data "config.spec_url=https://github.com/OAI/OpenAPI-Specification/blob/master/examples/v2.0/json/petstore.json"

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-spec-expose-example>
config: 
  spec_url: https://github.com/OAI/OpenAPI-Specification/blob/master/examples/v2.0/json/petstore.json
plugin: kong-spec-expose

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-spec-expose-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-spec-expose
  service: {SERVICE}
  config: 
    spec_url: https://github.com/OAI/OpenAPI-Specification/blob/master/examples/v2.0/json/petstore.json

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

Enable the plugin on a route

Admin API
Kubernetes
Declarative (YAML)

For example, configure this plugin on a route with:

$ curl -X POST http://{HOST}:8001/routes/{ROUTE}/plugins \
    --data "name=kong-spec-expose"  \
    --data "config.spec_url=https://github.com/OAI/OpenAPI-Specification/blob/master/examples/v2.0/json/petstore.json"

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-spec-expose-example>
config: 
  spec_url: https://github.com/OAI/OpenAPI-Specification/blob/master/examples/v2.0/json/petstore.json
plugin: kong-spec-expose

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-spec-expose-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-spec-expose
  route: <route>
  config: 
    spec_url: https://github.com/OAI/OpenAPI-Specification/blob/master/examples/v2.0/json/petstore.json

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.

Admin API
Kubernetes
Declarative (YAML)

For example, configure this plugin globally with:

$ curl -X POST http://{HOST}:8001/plugins/ \
    --data "name=kong-spec-expose"  \
    --data "config.spec_url=https://github.com/OAI/OpenAPI-Specification/blob/master/examples/v2.0/json/petstore.json"

Create a KongClusterPlugin resource and label it as global:

apiVersion: configuration.konghq.com/v1
kind: KongClusterPlugin
metadata:
  name: <global-kong-spec-expose>
  annotations:
    kubernetes.io/ingress.class: kong
  labels:
    global: \"true\"
config: 
  spec_url: https://github.com/OAI/OpenAPI-Specification/blob/master/examples/v2.0/json/petstore.json
plugin: kong-spec-expose

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

plugins:
- name: kong-spec-expose
  config: 
    spec_url: https://github.com/OAI/OpenAPI-Specification/blob/master/examples/v2.0/json/petstore.json

Parameters

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

Form Parameter Description
name

Type: string		 The name of the plugin to use, in this case kong-spec-expose.
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

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.spec_url
required

The full path to the specification/documentation of your service.