polaris/pkg/validator/deploy.go

import (
	"context"
	"net/http"

	conf "github.com/reactiveops/fairwinds/pkg/config"
	appsv1 "k8s.io/api/apps/v1"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/runtime/inject"
	"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
	"sigs.k8s.io/controller-runtime/pkg/webhook/admission/types"
)

// DeployValidator validates Pods
type DeployValidator struct {
	client  client.Client
	decoder types.Decoder
	Config  conf.Configuration
}

var _ inject.Client = &DeployValidator{}

// InjectClient injects the client.
func (v *DeployValidator) InjectClient(c client.Client) error {
	v.client = c
	return nil
}

var _ inject.Decoder = &DeployValidator{}

// InjectDecoder injects the decoder.
func (v *DeployValidator) InjectDecoder(d types.Decoder) error {
	v.decoder = d
	return nil
}

var _ admission.Handler = &DeployValidator{}

// Handle for DeployValidator admits a deploy if validation passes.
func (v *DeployValidator) Handle(ctx context.Context, req types.Request) types.Response {
	deploy := appsv1.Deployment{}

	err := v.decoder.Decode(req, &deploy)
	if err != nil {
		return admission.ErrorResponse(http.StatusBadRequest, err)
	}

	results := ValidateDeploys(v.Config, &deploy, Results{})
	allowed, reason := results.Format()

	return admission.ValidationResponse(allowed, reason)
}

// ValidateDeploys does validates that each deployment conforms to the Fairwinds config.
func ValidateDeploys(conf conf.Configuration, deploy *appsv1.Deployment, results Results) Results {
	pod := deploy.Spec.Template.Spec
	return ValidatePods(conf, pod, results)
}