ContainerImage.Pinniped/internal/concierge/impersonator/config.go

76 lines
2.8 KiB
Go
Raw Normal View History

// Copyright 2021 the Pinniped contributors. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package impersonator
import (
"fmt"
v1 "k8s.io/api/core/v1"
"sigs.k8s.io/yaml"
)
type Mode string
const (
// Explicitly enable the impersonation proxy.
ModeEnabled Mode = "enabled"
// Explicitly disable the impersonation proxy.
ModeDisabled Mode = "disabled"
// Allow the proxy to decide if it should be enabled or disabled based upon the cluster in which it is running.
ModeAuto Mode = "auto"
)
const (
ConfigMapDataKey = "config.yaml"
)
// When specified, both CertificateAuthoritySecretName and TLSSecretName are required. They may be specified to
// both point at the same Secret or to point at different Secrets.
type TLSConfig struct {
// CertificateAuthoritySecretName contains the name of a namespace-local Secret resource. The corresponding Secret
// must contain a key called "ca.crt" whose value is the CA certificate which clients should trust when connecting
// to the impersonation proxy.
CertificateAuthoritySecretName string `json:"certificateAuthoritySecretName"`
// TLSSecretName contains the name of a namespace-local Secret resource. The corresponding Secret must be of type
// "kubernetes.io/tls" and contain keys called "tls.crt" and "tls.key" whose values are the TLS certificate and
// private key that will be used by the impersonation proxy to serve its endpoints.
TLSSecretName string `json:"tlsSecretName"`
}
type Config struct {
// Enable or disable the impersonation proxy. Optional. Defaults to ModeAuto.
Mode Mode `json:"mode,omitempty"`
// The HTTPS URL of the impersonation proxy for clients to use from outside the cluster. Used when creating TLS
// certificates and for clients to discover the endpoint. Optional. When not specified, if the impersonation proxy
// is started, then it will automatically create a LoadBalancer Service and use its ingress as the endpoint.
Endpoint string `json:"endpoint,omitempty"`
// The TLS configuration of the impersonation proxy's endpoints. Optional. When not specified, a CA and TLS
// certificate will be automatically created based on the Endpoint setting.
TLS *TLSConfig `json:"tls,omitempty"`
}
func NewConfig() *Config {
return &Config{Mode: ModeAuto}
}
func ConfigFromConfigMap(configMap *v1.ConfigMap) (*Config, error) {
stringConfig, ok := configMap.Data[ConfigMapDataKey]
if !ok {
return nil, fmt.Errorf(`ConfigMap is missing expected key "%s"`, ConfigMapDataKey)
}
config := NewConfig()
if err := yaml.Unmarshal([]byte(stringConfig), config); err != nil {
return nil, fmt.Errorf("decode yaml: %w", err)
}
if config.Mode != ModeAuto && config.Mode != ModeEnabled && config.Mode != ModeDisabled {
return nil, fmt.Errorf(`illegal value for "mode": %s`, config.Mode)
}
return config, nil
}