Integrating Kuadrant OAS extensions with Red Hat OpenShift Dev Spaces¶

OpenAPI extensions enhance the standard OpenAPI specification by adding custom functionality. Kuadrant OpenAPI extensions are identified by the x-kuadrant prefix. You can use OpenAPI extensions to integrate Kuadrant policies directly into your API definitions.

Red Hat OpenShift Dev Spaces provides a browser-based, cloud-native IDE that supports rapid and decentralized development in container-based environments. This tutorial demonstrates how to use OpenShift Dev Spaces to modify an OpenAPI definition by incorporating Kuadrant policies, and then use the kuadrantctl CLI to create Kubernetes resources for both Gateway API and Kuadrant.

Prerequisites¶

You must have access to one of the following Dev Spaces instances:
A self-hosted OpenShift Dev Spaces instance.
An OpenShift Dev Spaces instance provided by the Red Hat Developer Sandbox.

Procedure¶

Step 1 - Setting up your workspace¶

Create a workspace in Dev Spaces for your project as follows:

Fork the following repository: https://github.com/Kuadrant/blank-petstore.
In Dev Spaces, select Create Workspace, and enter the URL of your forked repository. For example: https://github.com/<your-username>/blank-petstore.git.
Click Create & Open.

Step 2 - Configuring VS Code in Dev Spaces¶

For this tutorial, you will perform the following tasks:

Install kuadrantctl in your workspace to demonstrate Kubernetes resource generation from your modified OpenAPI definition.
Optional: Configure Git with your username and email to enable pushing changes back to your repository.

Install the kuadrantctl CLI¶

To install kuadrantctl in your Dev Spaces workspace, enter the following command:

curl -sL "https://github.com/kuadrant/kuadrantctl/releases/download/v0.2.3/kuadrantctl-v0.2.3-linux-amd64.tar.gz" | tar xz -C /home/user/.local/bin

This command installs kuadrantctl in /home/user/.local/bin, which is included in the container's $PATH by default.

Optional: Configuring Git¶

If you plan to push changes back to your repository, configure your Git username and email as follows:

git config --global user.email "foo@example.com"
git config --global user.name "Foo Example"

Step 3 - Adding Kuadrant policies to your OpenAPI definition¶

After creating your workspace, Dev Spaces will launch VS Code loaded with your forked repository. Navigate to the openapi.yaml file in the sample app to begin modifications.

Kuadrant policies overview¶

You will enhance your API definition by applying Kuadrant policies to the following endpoints:

/pet/findByStatus
/user/login
/store/inventory

In this tutorial, you will add Kuadrant policies to your API definition as follows:

Generate an HTTPRoute to expose these three routes for an existing Gateway.
Add API key authentication for the /user/login route, using a Kuadrant AuthPolicy and OAS securitySchemes.
Add a Kuadrant RateLimitPolicy to the /store/inventory endpoint, to limit the amount of requests this endpoint can receive.

Defining a Gateway¶

Use the x-kuadrant extension in the info block to specify a Gateway. This information will be used to generate HTTPRoutes at the path level. For example:

info:
  x-kuadrant:
    route:  ## HTTPRoute metadata
      name: "petstore"
      namespace: "petstore"
      labels:  ## map[string]string
        deployment: petstore
      hostnames:  ## []gateway.networking.k8s.io/v1beta1.Hostname

        - example.com
      parentRefs:  ## []gateway.networking.k8s.io/v1beta1.ParentReference
        - name: apiGateway
          namespace: gateways

Specifying HTTPRoutes for each path¶

For each path, add an x-kuadrant extension with backendRefs to link your routes to your paths as follows:

  /pet/findByStatus:
    x-kuadrant:
      backendRefs:

      - name: petstore
        namespace: petstore
        port: 8080
    get:
      # ...

  /user/login:
    x-kuadrant:
      backendRefs:

      - name: petstore
        namespace: petstore
        port: 8080
    get:
      # ...

  /store/inventory:
    x-kuadrant:
      backendRefs:

      - name: petstore
        namespace: petstore
        port: 8080
    get:
      # ...

Note: The x-kuadrant extension at the path level applies to all HTTP methods defined in the path. For method-specific policies, move the extension inside the relevant HTTP method block, for example, get or post.

Implementing AuthPolicy and security schemes¶

To secure the /user/login endpoint with API key authentication, use the following configuration:

  /user/login:
    # ...
    get:
      security:

      - api_key: []

components:
  schemas:
    # ...
  securitySchemes:
    api_key:
      type: apiKey
      name: api_key
      in: header

This configuration generates an AuthPolicy that references an API key stored in a labeled Secret:

apiVersion: v1
kind: Secret
metadata:
  name: petstore-api-key
  namespace: petstore
  labels:
    authorino.kuadrant.io/managed-by: authorino
    kuadrant.io/apikeys-by: api_key
stringData:
  api_key: secret
type: Opaque

For simplicity, this example uses a simple, static API key for your app.

Applying a RateLimitPolicy to an endpoint¶

To enforce rate limiting on the /store/inventory endpoint, add the following x-kuadrant extension:

  /store/inventory:
    get:
      # ...
      x-kuadrant:
        backendRefs:
          # ...
        rate_limit:
          rates:

          - limit: 10
            duration: 10
            unit: second

This limits to 10 requests every 10 seconds for the /store/inventory endpoint.

Step 4 - Generate Kubernetes resources by using kuadrantctl¶

With your extensions in place, you can use kuadrantctl to generate the follollowing Kubernetes resources:

An HTTPRoute for your petstore app for each of your endpoints.
An AuthPolicy with a simple, static API key from a secret for the /user/login endpoint.
A RateLimitPolicy with a rate limit of 10 requests every 10 seconds for the /store/inventory endpoint.

In Dev Spaces, select ☰ > Terminal > New Terminal, and run the following commands:

Generate an HTTPRoute¶

kuadrantctl generate gatewayapi httproute --oas openapi.yaml

This command outputs the following HTTPRoute:

kind: HTTPRoute
apiVersion: gateway.networking.k8s.io/v1beta1
metadata:
  name: petstore
  namespace: petstore
  creationTimestamp: null
  labels:
    deployment: petstore
spec:
  parentRefs:

    - namespace: gateways
      name: apiGateway
  hostnames:
    - example.com
  rules:
    - matches:
        - path:
            type: Exact
            value: /api/v3/pet/findByStatus
          method: GET
      backendRefs:
        - name: petstore
          namespace: petstore
          port: 8080
    - matches:
        - path:
            type: Exact
            value: /api/v3/store/inventory
          method: GET
      backendRefs:
        - name: petstore
          namespace: petstore
          port: 8080
    - matches:
        - path:
            type: Exact
            value: /api/v3/user/login
          method: GET
      backendRefs:
        - name: petstore
          namespace: petstore
          port: 8080
status:
  parents: null

Generate an AuthPolicy¶

kuadrantctl generate kuadrant authpolicy --oas openapi.yaml

This command outputs the following AuthPolicy:

apiVersion: kuadrant.io/v1beta2
kind: AuthPolicy
metadata:
  name: petstore
  namespace: petstore
  creationTimestamp: null
  labels:
    deployment: petstore
spec:
  targetRef:
    group: gateway.networking.k8s.io
    kind: HTTPRoute
    name: petstore
    namespace: petstore
  routeSelectors:

    - matches:
        - path:
            type: Exact
            value: /api/v3/user/login
          method: GET
  rules:
    authentication:
      GETuserlogin_api_key:
        credentials:
          customHeader:
            name: api_key
        apiKey:
          selector:
            matchLabels:
              kuadrant.io/apikeys-by: api_key
        routeSelectors:
          - matches:
              - path:
                  type: Exact
                  value: /api/v3/user/login
                method: GET
status: {}

Generate a RateLimitPolicy¶

kuadrantctl generate kuadrant ratelimitpolicy --oas openapi.yaml

This command outputs the following RateLimitPolicy:

apiVersion: kuadrant.io/v1beta2
kind: RateLimitPolicy
metadata:
  name: petstore
  namespace: petstore
  creationTimestamp: null
  labels:
    deployment: petstore
spec:
  targetRef:
    group: gateway.networking.k8s.io
    kind: HTTPRoute
    name: petstore
    namespace: petstore
  limits:
    GETstoreinventory:
      routeSelectors:

        - matches:
            - path:
                type: Exact
                value: /api/v3/store/inventory
              method: GET
      rates:
        - limit: 10
          duration: 10
          unit: second
status: {}

Step 5 - Applying resources to the app¶

Note: By default, the oc and kubectl commands in Dev Spaces target the cluster running Dev Spaces. If you want to apply resources to another cluster, you must log in with oc or kubectl to another cluster, and pass a different --context to these commands to apply resources to another cluster.

You can now apply these policies to a running app by using kubectl or oc. If Dev Spaces is running on a cluster where Kuadrant is also installed, you can apply these resources as follows:

kuadrantctl generate gatewayapi httproute --oas openapi.yaml | kubectl apply -f -
kuadrantctl generate kuadrant authpolicy --oas openapi.yaml | kubectl apply -f -
kuadrantctl generate kuadrant ratelimitpolicy --oas openapi.yaml | kubectl apply -f -

Alternatively, you can use kuadrantctl as part of a CI/CD pipeline. For more details, see the kuadrantctl CI/CD guide.

If you completed the optional Git configuration step, you can enter git commit to commit the these changes and push them to your fork.

Additional resources¶

For more details, see the following documentation on using x-kuadrant OAS extensions with kuadrantctl: