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move webhook self installer to CT as generator
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Mengqi Yu
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Feb 1, 2019
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| /* | ||
| Copyright 2018 The Kubernetes Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package admission | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "regexp" | ||
| "strings" | ||
| "sync" | ||
|
|
||
| admissionregistrationv1beta1 "k8s.io/api/admissionregistration/v1beta1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "sigs.k8s.io/controller-runtime/pkg/internal/webhookgenerator/types" | ||
| ) | ||
|
|
||
| // Webhook represents each individual webhook. | ||
| type Webhook struct { | ||
| // Name is the name of the webhook | ||
| Name string | ||
| // Type is the webhook type, i.e. mutating, validating | ||
| Type types.WebhookType | ||
| // Path is the path this webhook will serve. | ||
| Path string | ||
| // Rules maps to the Rules field in admissionregistrationv1beta1.Webhook | ||
| Rules []admissionregistrationv1beta1.RuleWithOperations | ||
| // FailurePolicy maps to the FailurePolicy field in admissionregistrationv1beta1.Webhook | ||
| // This optional. If not set, will be defaulted to Ignore (fail-open) by the server. | ||
| // More details: https://github.com/kubernetes/api/blob/f5c295feaba2cbc946f0bbb8b535fc5f6a0345ee/admissionregistration/v1beta1/types.go#L144-L147 | ||
| FailurePolicy *admissionregistrationv1beta1.FailurePolicyType | ||
| // NamespaceSelector maps to the NamespaceSelector field in admissionregistrationv1beta1.Webhook | ||
| // This optional. | ||
| NamespaceSelector *metav1.LabelSelector | ||
|
|
||
| once sync.Once | ||
| } | ||
|
|
||
| func (w *Webhook) setDefaults() { | ||
| if len(w.Path) == 0 { | ||
| if len(w.Rules) == 0 || len(w.Rules[0].Resources) == 0 { | ||
| // can't do defaulting, skip it. | ||
| return | ||
| } | ||
| if w.Type == types.WebhookTypeMutating { | ||
| w.Path = "/mutate-" + w.Rules[0].Resources[0] | ||
| } else if w.Type == types.WebhookTypeValidating { | ||
| w.Path = "/validate-" + w.Rules[0].Resources[0] | ||
| } | ||
| } | ||
| if len(w.Name) == 0 { | ||
| reg := regexp.MustCompile("[^a-zA-Z0-9]+") | ||
| processedPath := strings.ToLower(reg.ReplaceAllString(w.Path, "")) | ||
| w.Name = processedPath + ".example.com" | ||
| } | ||
| } | ||
|
|
||
| // GetName returns the name of the webhook. | ||
| func (w *Webhook) GetName() string { | ||
| w.once.Do(w.setDefaults) | ||
| return w.Name | ||
| } | ||
|
|
||
| // GetPath returns the path that the webhook registered. | ||
| func (w *Webhook) GetPath() string { | ||
| w.once.Do(w.setDefaults) | ||
| return w.Path | ||
| } | ||
|
|
||
| // GetType returns the type of the webhook. | ||
| func (w *Webhook) GetType() types.WebhookType { | ||
| w.once.Do(w.setDefaults) | ||
| return w.Type | ||
| } | ||
|
|
||
| // Validate validates if the webhook is valid. | ||
| func (w *Webhook) Validate() error { | ||
| w.once.Do(w.setDefaults) | ||
| if len(w.Rules) == 0 { | ||
| return errors.New("field Rules should not be empty") | ||
| } | ||
| if len(w.Name) == 0 { | ||
| return errors.New("field Name should not be empty") | ||
| } | ||
| if w.Type != types.WebhookTypeMutating && w.Type != types.WebhookTypeValidating { | ||
| return fmt.Errorf("unsupported Type: %v, only WebhookTypeMutating and WebhookTypeValidating are supported", w.Type) | ||
| } | ||
| if len(w.Path) == 0 { | ||
| return errors.New("field Path should not be empty") | ||
| } | ||
| return nil | ||
| } |
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