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74 lines
2.4 KiB
Go
74 lines
2.4 KiB
Go
package engine
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import (
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"errors"
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"fmt"
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"log"
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client "github.com/nirmata/kube-policy/client"
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kubepolicy "github.com/nirmata/kube-policy/pkg/apis/policy/v1alpha1"
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"github.com/nirmata/kube-policy/pkg/engine/mutation"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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)
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// Generate should be called to process generate rules on the resource
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func Generate(client *client.Client, logger *log.Logger, policy kubepolicy.Policy, rawResource []byte, gvk metav1.GroupVersionKind) {
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// configMapGenerator and secretGenerator can be applied only to namespaces
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if gvk.Kind != "Namespace" {
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return
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}
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for i, rule := range policy.Spec.Rules {
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// Checks for preconditions
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// TODO: Rework PolicyEngine interface that it receives not a policy, but mutation object for
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// Mutate, validation for Validate and so on. It will allow to bring this checks outside of PolicyEngine
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// to common part as far as they present for all: mutation, validation, generation
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err := rule.Validate()
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if err != nil {
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logger.Printf("Rule has invalid structure: rule number = %d, rule name = %s in policy %s, err: %v\n", i, rule.Name, policy.ObjectMeta.Name, err)
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continue
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}
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ok, err := mutation.ResourceMeetsRules(rawResource, rule.ResourceDescription, gvk)
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if err != nil {
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logger.Printf("Rule has invalid data: rule number = %d, rule name = %s in policy %s, err: %v\n", i, rule.Name, policy.ObjectMeta.Name, err)
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continue
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}
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if !ok {
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logger.Printf("Rule is not applicable to the request: rule name = %s in policy %s \n", rule.Name, policy.ObjectMeta.Name)
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continue
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}
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err = applyRuleGenerator(client, rawResource, rule.Generation, gvk)
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if err != nil {
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logger.Printf("Failed to apply rule generator: %v", err)
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}
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}
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}
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// Applies "configMapGenerator" and "secretGenerator" described in PolicyRule
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// TODO: plan to support all kinds of generator
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func applyRuleGenerator(client *client.Client, rawResource []byte, generator *kubepolicy.Generation, gvk metav1.GroupVersionKind) error {
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if generator == nil {
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return nil
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}
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err := generator.Validate()
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if err != nil {
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return fmt.Errorf("Generator for '%s' is invalid: %s", generator.Kind, err)
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}
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namespaceName := mutation.ParseNameFromObject(rawResource)
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// Generate the resource
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switch gvk.Kind {
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case "configmap":
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err = client.GenerateConfigMap(*generator, namespaceName)
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case "secret":
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err = client.GenerateSecret(*generator, namespaceName)
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case "default":
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err = errors.New("resource not supported")
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}
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return err
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}
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