/*
Copyright 2015 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 config

import (
	v1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	componentbaseconfig "k8s.io/component-base/config"
)

// HairpinMode denotes how the kubelet should configure networking to handle
// hairpin packets.
type HairpinMode string

// Enum settings for different ways to handle hairpin packets.
const (
	// Set the hairpin flag on the veth of containers in the respective
	// container runtime.
	HairpinVeth = "hairpin-veth"
	// Make the container bridge promiscuous. This will force it to accept
	// hairpin packets, even if the flag isn't set on ports of the bridge.
	PromiscuousBridge = "promiscuous-bridge"
	// Neither of the above. If the kubelet is started in this hairpin mode
	// and kube-proxy is running in iptables mode, hairpin packets will be
	// dropped by the container bridge.
	HairpinNone = "none"
)

// ResourceChangeDetectionStrategy denotes a mode in which internal
// managers (secret, configmap) are discovering object changes.
type ResourceChangeDetectionStrategy string

// Enum settings for different strategies of kubelet managers.
const (
	// GetChangeDetectionStrategy is a mode in which kubelet fetches
	// necessary objects directly from apiserver.
	GetChangeDetectionStrategy ResourceChangeDetectionStrategy = "Get"
	// TTLCacheChangeDetectionStrategy is a mode in which kubelet uses
	// ttl cache for object directly fetched from apiserver.
	TTLCacheChangeDetectionStrategy ResourceChangeDetectionStrategy = "Cache"
	// WatchChangeDetectionStrategy is a mode in which kubelet uses
	// watches to observe changes to objects that are in its interest.
	WatchChangeDetectionStrategy ResourceChangeDetectionStrategy = "Watch"
	// RestrictedTopologyManagerPolicy is a mode in which kubelet only allows
	// pods with optimal NUMA node alignment for requested resources
	RestrictedTopologyManagerPolicy = "restricted"
	// BestEffortTopologyManagerPolicy is a mode in which kubelet will favour
	// pods with NUMA alignment of CPU and device resources.
	BestEffortTopologyManagerPolicy = "best-effort"
	// NoneTopologyManagerPolicy is a mode in which kubelet has no knowledge
	// of NUMA alignment of a pod's CPU and device resources.
	NoneTopologyManagerPolicy = "none"
	// SingleNumaNodeTopologyManagerPolicy is a mode in which kubelet only allows
	// pods with a single NUMA alignment of CPU and device resources.
	SingleNumaNodeTopologyManagerPolicy = "single-numa-node"
	// ContainerTopologyManagerScope represents that
	// topology policy is applied on a per-container basis.
	ContainerTopologyManagerScope = "container"
	// PodTopologyManagerScope represents that
	// topology policy is applied on a per-pod basis.
	PodTopologyManagerScope = "pod"
)

// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object

// KubeletConfiguration contains the configuration for the Kubelet
type KubeletConfiguration struct {
	metav1.TypeMeta

	// enableServer enables Kubelet's secured server.
	// Note: Kubelet's insecure port is controlled by the readOnlyPort option.
	EnableServer bool
	// staticPodPath is the path to the directory containing local (static) pods to
	// run, or the path to a single static pod file.
	StaticPodPath string
	// syncFrequency is the max period between synchronizing running
	// containers and config
	SyncFrequency metav1.Duration
	// fileCheckFrequency is the duration between checking config files for
	// new data
	FileCheckFrequency metav1.Duration
	// httpCheckFrequency is the duration between checking http for new data
	HTTPCheckFrequency metav1.Duration
	// staticPodURL is the URL for accessing static pods to run
	StaticPodURL string
	// staticPodURLHeader is a map of slices with HTTP headers to use when accessing the podURL
	StaticPodURLHeader map[string][]string
	// address is the IP address for the Kubelet to serve on (set to 0.0.0.0
	// for all interfaces)
	Address string
	// port is the port for the Kubelet to serve on.
	Port int32
	// readOnlyPort is the read-only port for the Kubelet to serve on with
	// no authentication/authorization (set to 0 to disable)
	ReadOnlyPort int32
	// volumePluginDir is the full path of the directory in which to search
	// for additional third party volume plugins.
	VolumePluginDir string
	// providerID, if set, sets the unique id of the instance that an external provider (i.e. cloudprovider)
	// can use to identify a specific node
	ProviderID string
	// tlsCertFile is the file containing x509 Certificate for HTTPS.  (CA cert,
	// if any, concatenated after server cert). If tlsCertFile and
	// tlsPrivateKeyFile are not provided, a self-signed certificate
	// and key are generated for the public address and saved to the directory
	// passed to the Kubelet's --cert-dir flag.
	TLSCertFile string
	// tlsPrivateKeyFile is the file containing x509 private key matching tlsCertFile
	TLSPrivateKeyFile string
	// TLSCipherSuites is the list of allowed cipher suites for the server.
	// Values are from tls package constants (https://golang.org/pkg/crypto/tls/#pkg-constants).
	TLSCipherSuites []string
	// TLSMinVersion is the minimum TLS version supported.
	// Values are from tls package constants (https://golang.org/pkg/crypto/tls/#pkg-constants).
	TLSMinVersion string
	// rotateCertificates enables client certificate rotation. The Kubelet will request a
	// new certificate from the certificates.k8s.io API. This requires an approver to approve the
	// certificate signing requests.
	RotateCertificates bool
	// serverTLSBootstrap enables server certificate bootstrap. Instead of self
	// signing a serving certificate, the Kubelet will request a certificate from
	// the certificates.k8s.io API. This requires an approver to approve the
	// certificate signing requests. The RotateKubeletServerCertificate feature
	// must be enabled.
	ServerTLSBootstrap bool
	// authentication specifies how requests to the Kubelet's server are authenticated
	Authentication KubeletAuthentication
	// authorization specifies how requests to the Kubelet's server are authorized
	Authorization KubeletAuthorization
	// registryPullQPS is the limit of registry pulls per second.
	// Set to 0 for no limit.
	RegistryPullQPS int32
	// registryBurst is the maximum size of bursty pulls, temporarily allows
	// pulls to burst to this number, while still not exceeding registryPullQPS.
	// Only used if registryPullQPS > 0.
	RegistryBurst int32
	// eventRecordQPS is the maximum event creations per second. If 0, there
	// is no limit enforced.
	EventRecordQPS int32
	// eventBurst is the maximum size of a burst of event creations, temporarily
	// allows event creations to burst to this number, while still not exceeding
	// eventRecordQPS. Only used if eventRecordQPS > 0.
	EventBurst int32
	// enableDebuggingHandlers enables server endpoints for log collection
	// and local running of containers and commands
	EnableDebuggingHandlers bool
	// enableContentionProfiling enables lock contention profiling, if enableDebuggingHandlers is true.
	EnableContentionProfiling bool
	// healthzPort is the port of the localhost healthz endpoint (set to 0 to disable)
	HealthzPort int32
	// healthzBindAddress is the IP address for the healthz server to serve on
	HealthzBindAddress string
	// oomScoreAdj is The oom-score-adj value for kubelet process. Values
	// must be within the range [-1000, 1000].
	OOMScoreAdj int32
	// clusterDomain is the DNS domain for this cluster. If set, kubelet will
	// configure all containers to search this domain in addition to the
	// host's search domains.
	ClusterDomain string
	// clusterDNS is a list of IP addresses for a cluster DNS server. If set,
	// kubelet will configure all containers to use this for DNS resolution
	// instead of the host's DNS servers.
	ClusterDNS []string
	// streamingConnectionIdleTimeout is the maximum time a streaming connection
	// can be idle before the connection is automatically closed.
	StreamingConnectionIdleTimeout metav1.Duration
	// nodeStatusUpdateFrequency is the frequency that kubelet computes node
	// status. If node lease feature is not enabled, it is also the frequency that
	// kubelet posts node status to master. In that case, be cautious when
	// changing the constant, it must work with nodeMonitorGracePeriod in nodecontroller.
	NodeStatusUpdateFrequency metav1.Duration
	// nodeStatusReportFrequency is the frequency that kubelet posts node
	// status to master if node status does not change. Kubelet will ignore this
	// frequency and post node status immediately if any change is detected. It is
	// only used when node lease feature is enabled.
	NodeStatusReportFrequency metav1.Duration
	// nodeLeaseDurationSeconds is the duration the Kubelet will set on its corresponding Lease.
	NodeLeaseDurationSeconds int32
	// imageMinimumGCAge is the minimum age for an unused image before it is
	// garbage collected.
	ImageMinimumGCAge metav1.Duration
	// imageGCHighThresholdPercent is the percent of disk usage after which
	// image garbage collection is always run. The percent is calculated as
	// this field value out of 100.
	ImageGCHighThresholdPercent int32
	// imageGCLowThresholdPercent is the percent of disk usage before which
	// image garbage collection is never run. Lowest disk usage to garbage
	// collect to. The percent is calculated as this field value out of 100.
	ImageGCLowThresholdPercent int32
	// How frequently to calculate and cache volume disk usage for all pods
	VolumeStatsAggPeriod metav1.Duration
	// KubeletCgroups is the absolute name of cgroups to isolate the kubelet in
	KubeletCgroups string
	// SystemCgroups is absolute name of cgroups in which to place
	// all non-kernel processes that are not already in a container. Empty
	// for no container. Rolling back the flag requires a reboot.
	SystemCgroups string
	// CgroupRoot is the root cgroup to use for pods.
	// If CgroupsPerQOS is enabled, this is the root of the QoS cgroup hierarchy.
	CgroupRoot string
	// Enable QoS based Cgroup hierarchy: top level cgroups for QoS Classes
	// And all Burstable and BestEffort pods are brought up under their
	// specific top level QoS cgroup.
	CgroupsPerQOS bool
	// driver that the kubelet uses to manipulate cgroups on the host (cgroupfs or systemd)
	CgroupDriver string
	// CPUManagerPolicy is the name of the policy to use.
	// Requires the CPUManager feature gate to be enabled.
	CPUManagerPolicy string
	// CPU Manager reconciliation period.
	// Requires the CPUManager feature gate to be enabled.
	CPUManagerReconcilePeriod metav1.Duration
	// TopologyManagerPolicy is the name of the policy to use.
	// Policies other than "none" require the TopologyManager feature gate to be enabled.
	TopologyManagerPolicy string
	// TopologyManagerScope represents the scope of topology hint generation
	// that topology manager requests and hint providers generate.
	// "pod" scope requires the TopologyManager feature gate to be enabled.
	// Default: "container"
	// +optional
	TopologyManagerScope string
	// Map of QoS resource reservation percentages (memory only for now).
	// Requires the QOSReserved feature gate to be enabled.
	QOSReserved map[string]string
	// runtimeRequestTimeout is the timeout for all runtime requests except long running
	// requests - pull, logs, exec and attach.
	RuntimeRequestTimeout metav1.Duration
	// hairpinMode specifies how the Kubelet should configure the container
	// bridge for hairpin packets.
	// Setting this flag allows endpoints in a Service to loadbalance back to
	// themselves if they should try to access their own Service. Values:
	//   "promiscuous-bridge": make the container bridge promiscuous.
	//   "hairpin-veth":       set the hairpin flag on container veth interfaces.
	//   "none":               do nothing.
	// Generally, one must set --hairpin-mode=hairpin-veth to achieve hairpin NAT,
	// because promiscuous-bridge assumes the existence of a container bridge named cbr0.
	HairpinMode string
	// maxPods is the number of pods that can run on this Kubelet.
	MaxPods int32
	// The CIDR to use for pod IP addresses, only used in standalone mode.
	// In cluster mode, this is obtained from the master.
	PodCIDR string
	// The maximum number of processes per pod.  If -1, the kubelet defaults to the node allocatable pid capacity.
	PodPidsLimit int64
	// ResolverConfig is the resolver configuration file used as the basis
	// for the container DNS resolution configuration.
	ResolverConfig string
	// RunOnce causes the Kubelet to check the API server once for pods,
	// run those in addition to the pods specified by static pod files, and exit.
	RunOnce bool
	// cpuCFSQuota enables CPU CFS quota enforcement for containers that
	// specify CPU limits
	CPUCFSQuota bool
	// CPUCFSQuotaPeriod sets the CPU CFS quota period value, cpu.cfs_period_us, defaults to 100ms
	CPUCFSQuotaPeriod metav1.Duration
	// maxOpenFiles is Number of files that can be opened by Kubelet process.
	MaxOpenFiles int64
	// nodeStatusMaxImages caps the number of images reported in Node.Status.Images.
	NodeStatusMaxImages int32
	// contentType is contentType of requests sent to apiserver.
	ContentType string
	// kubeAPIQPS is the QPS to use while talking with kubernetes apiserver
	KubeAPIQPS int32
	// kubeAPIBurst is the burst to allow while talking with kubernetes
	// apiserver
	KubeAPIBurst int32
	// serializeImagePulls when enabled, tells the Kubelet to pull images one at a time.
	SerializeImagePulls bool
	// Map of signal names to quantities that defines hard eviction thresholds. For example: {"memory.available": "300Mi"}.
	EvictionHard map[string]string
	// Map of signal names to quantities that defines soft eviction thresholds.  For example: {"memory.available": "300Mi"}.
	EvictionSoft map[string]string
	// Map of signal names to quantities that defines grace periods for each soft eviction signal. For example: {"memory.available": "30s"}.
	EvictionSoftGracePeriod map[string]string
	// Duration for which the kubelet has to wait before transitioning out of an eviction pressure condition.
	EvictionPressureTransitionPeriod metav1.Duration
	// Maximum allowed grace period (in seconds) to use when terminating pods in response to a soft eviction threshold being met.
	EvictionMaxPodGracePeriod int32
	// Map of signal names to quantities that defines minimum reclaims, which describe the minimum
	// amount of a given resource the kubelet will reclaim when performing a pod eviction while
	// that resource is under pressure. For example: {"imagefs.available": "2Gi"}
	EvictionMinimumReclaim map[string]string
	// podsPerCore is the maximum number of pods per core. Cannot exceed MaxPods.
	// If 0, this field is ignored.
	PodsPerCore int32
	// enableControllerAttachDetach enables the Attach/Detach controller to
	// manage attachment/detachment of volumes scheduled to this node, and
	// disables kubelet from executing any attach/detach operations
	EnableControllerAttachDetach bool
	// protectKernelDefaults, if true, causes the Kubelet to error if kernel
	// flags are not as it expects. Otherwise the Kubelet will attempt to modify
	// kernel flags to match its expectation.
	ProtectKernelDefaults bool
	// If true, Kubelet ensures a set of iptables rules are present on host.
	// These rules will serve as utility for various components, e.g. kube-proxy.
	// The rules will be created based on IPTablesMasqueradeBit and IPTablesDropBit.
	MakeIPTablesUtilChains bool
	// iptablesMasqueradeBit is the bit of the iptables fwmark space to mark for SNAT
	// Values must be within the range [0, 31]. Must be different from other mark bits.
	// Warning: Please match the value of the corresponding parameter in kube-proxy.
	// TODO: clean up IPTablesMasqueradeBit in kube-proxy
	IPTablesMasqueradeBit int32
	// iptablesDropBit is the bit of the iptables fwmark space to mark for dropping packets.
	// Values must be within the range [0, 31]. Must be different from other mark bits.
	IPTablesDropBit int32
	// featureGates is a map of feature names to bools that enable or disable alpha/experimental
	// features. This field modifies piecemeal the built-in default values from
	// "k8s.io/kubernetes/pkg/features/kube_features.go".
	FeatureGates map[string]bool
	// Tells the Kubelet to fail to start if swap is enabled on the node.
	FailSwapOn bool
	// A quantity defines the maximum size of the container log file before it is rotated. For example: "5Mi" or "256Ki".
	ContainerLogMaxSize string
	// Maximum number of container log files that can be present for a container.
	ContainerLogMaxFiles int32
	// ConfigMapAndSecretChangeDetectionStrategy is a mode in which config map and secret managers are running.
	ConfigMapAndSecretChangeDetectionStrategy ResourceChangeDetectionStrategy
	// A comma separated whitelist of unsafe sysctls or sysctl patterns (ending in *).
	// Unsafe sysctl groups are kernel.shm*, kernel.msg*, kernel.sem, fs.mqueue.*, and net.*.
	// These sysctls are namespaced but not allowed by default.  For example: "kernel.msg*,net.ipv4.route.min_pmtu"
	// +optional
	AllowedUnsafeSysctls []string
	// kernelMemcgNotification if enabled, the kubelet will integrate with the kernel memcg
	// notification to determine if memory eviction thresholds are crossed rather than polling.
	KernelMemcgNotification bool

	/* the following fields are meant for Node Allocatable */

	// A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G,pid=100) pairs
	// that describe resources reserved for non-kubernetes components.
	// Currently only cpu and memory are supported.
	// See http://kubernetes.io/docs/user-guide/compute-resources for more detail.
	SystemReserved map[string]string
	// A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G,pid=100) pairs
	// that describe resources reserved for kubernetes system components.
	// Currently cpu, memory and local ephemeral storage for root file system are supported.
	// See http://kubernetes.io/docs/user-guide/compute-resources for more detail.
	KubeReserved map[string]string
	// This flag helps kubelet identify absolute name of top level cgroup used to enforce `SystemReserved` compute resource reservation for OS system daemons.
	// Refer to [Node Allocatable](https://git.k8s.io/community/contributors/design-proposals/node/node-allocatable.md) doc for more information.
	SystemReservedCgroup string
	// This flag helps kubelet identify absolute name of top level cgroup used to enforce `KubeReserved` compute resource reservation for Kubernetes node system daemons.
	// Refer to [Node Allocatable](https://git.k8s.io/community/contributors/design-proposals/node/node-allocatable.md) doc for more information.
	KubeReservedCgroup string
	// This flag specifies the various Node Allocatable enforcements that Kubelet needs to perform.
	// This flag accepts a list of options. Acceptable options are `pods`, `system-reserved` & `kube-reserved`.
	// Refer to [Node Allocatable](https://git.k8s.io/community/contributors/design-proposals/node/node-allocatable.md) doc for more information.
	EnforceNodeAllocatable []string
	// This option specifies the cpu list reserved for the host level system threads and kubernetes related threads.
	// This provide a "static" CPU list rather than the "dynamic" list by system-reserved and kube-reserved.
	// This option overwrites CPUs provided by system-reserved and kube-reserved.
	ReservedSystemCPUs string
	// The previous version for which you want to show hidden metrics.
	// Only the previous minor version is meaningful, other values will not be allowed.
	// The format is <major>.<minor>, e.g.: '1.16'.
	// The purpose of this format is make sure you have the opportunity to notice if the next release hides additional metrics,
	// rather than being surprised when they are permanently removed in the release after that.
	ShowHiddenMetricsForVersion string
	// Logging specifies the options of logging.
	// Refer [Logs Options](https://github.com/kubernetes/component-base/blob/master/logs/options.go) for more information.
	Logging componentbaseconfig.LoggingConfiguration
	// EnableSystemLogHandler enables /logs handler.
	EnableSystemLogHandler bool
	// ShutdownGracePeriod specifies the total duration that the node should delay the shutdown and total grace period for pod termination during a node shutdown.
	// Defaults to 30 seconds, requires GracefulNodeShutdown feature gate to be enabled.
	ShutdownGracePeriod metav1.Duration
	// ShutdownGracePeriodCriticalPods specifies the duration used to terminate critical pods during a node shutdown. This should be less than ShutdownGracePeriod.
	// Defaults to 10 seconds, requires GracefulNodeShutdown feature gate to be enabled.
	// For example, if ShutdownGracePeriod=30s, and ShutdownGracePeriodCriticalPods=10s, during a node shutdown the first 20 seconds would be reserved for gracefully terminating normal pods, and the last 10 seconds would be reserved for terminating critical pods.
	ShutdownGracePeriodCriticalPods metav1.Duration
}

// KubeletAuthorizationMode denotes the authorization mode for the kubelet
type KubeletAuthorizationMode string

const (
	// KubeletAuthorizationModeAlwaysAllow authorizes all authenticated requests
	KubeletAuthorizationModeAlwaysAllow KubeletAuthorizationMode = "AlwaysAllow"
	// KubeletAuthorizationModeWebhook uses the SubjectAccessReview API to determine authorization
	KubeletAuthorizationModeWebhook KubeletAuthorizationMode = "Webhook"
)

// KubeletAuthorization holds the state related to the authorization in the kublet.
type KubeletAuthorization struct {
	// mode is the authorization mode to apply to requests to the kubelet server.
	// Valid values are AlwaysAllow and Webhook.
	// Webhook mode uses the SubjectAccessReview API to determine authorization.
	Mode KubeletAuthorizationMode

	// webhook contains settings related to Webhook authorization.
	Webhook KubeletWebhookAuthorization
}

// KubeletWebhookAuthorization holds the state related to the Webhook
// Authorization in the Kubelet.
type KubeletWebhookAuthorization struct {
	// cacheAuthorizedTTL is the duration to cache 'authorized' responses from the webhook authorizer.
	CacheAuthorizedTTL metav1.Duration
	// cacheUnauthorizedTTL is the duration to cache 'unauthorized' responses from the webhook authorizer.
	CacheUnauthorizedTTL metav1.Duration
}

// KubeletAuthentication holds the Kubetlet Authentication setttings.
type KubeletAuthentication struct {
	// x509 contains settings related to x509 client certificate authentication
	X509 KubeletX509Authentication
	// webhook contains settings related to webhook bearer token authentication
	Webhook KubeletWebhookAuthentication
	// anonymous contains settings related to anonymous authentication
	Anonymous KubeletAnonymousAuthentication
}

// KubeletX509Authentication contains settings related to x509 client certificate authentication
type KubeletX509Authentication struct {
	// clientCAFile is the path to a PEM-encoded certificate bundle. If set, any request presenting a client certificate
	// signed by one of the authorities in the bundle is authenticated with a username corresponding to the CommonName,
	// and groups corresponding to the Organization in the client certificate.
	ClientCAFile string
}

// KubeletWebhookAuthentication contains settings related to webhook authentication
type KubeletWebhookAuthentication struct {
	// enabled allows bearer token authentication backed by the tokenreviews.authentication.k8s.io API
	Enabled bool
	// cacheTTL enables caching of authentication results
	CacheTTL metav1.Duration
}

// KubeletAnonymousAuthentication enables anonymous requests to the kubelet server.
type KubeletAnonymousAuthentication struct {
	// enabled allows anonymous requests to the kubelet server.
	// Requests that are not rejected by another authentication method are treated as anonymous requests.
	// Anonymous requests have a username of system:anonymous, and a group name of system:unauthenticated.
	Enabled bool
}

// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object

// SerializedNodeConfigSource allows us to serialize NodeConfigSource
// This type is used internally by the Kubelet for tracking checkpointed dynamic configs.
// It exists in the kubeletconfig API group because it is classified as a versioned input to the Kubelet.
type SerializedNodeConfigSource struct {
	metav1.TypeMeta
	// Source is the source that we are serializing
	// +optional
	Source v1.NodeConfigSource
}

// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object

// CredentialProviderConfig is the configuration containing information about
// each exec credential provider. Kubelet reads this configuration from disk and enables
// each provider as specified by the CredentialProvider type.
type CredentialProviderConfig struct {
	metav1.TypeMeta

	// providers is a list of credential provider plugins that will be enabled by the kubelet.
	// Multiple providers may match against a single image, in which case credentials
	// from all providers will be returned to the kubelet. If multiple providers are called
	// for a single image, the results are combined. If providers return overlapping
	// auth keys, the value from the provider earlier in this list is used.
	Providers []CredentialProvider
}

// CredentialProvider represents an exec plugin to be invoked by the kubelet. The plugin is only
// invoked when an image being pulled matches the images handled by the plugin (see matchImages).
type CredentialProvider struct {
	// name is the required name of the credential provider. It must match the name of the
	// provider executable as seen by the kubelet. The executable must be in the kubelet's
	// bin directory (set by the --credential-provider-bin-dir flag).
	Name string

	// matchImages is a required list of strings used to match against images in order to
	// determine if this provider should be invoked. If one of the strings matches the
	// requested image from the kubelet, the plugin will be invoked and given a chance
	// to provide credentials. Images are expected to contain the registry domain
	// and URL path.
	//
	// Each entry in matchImages is a pattern which can optionally contain a port and a path.
	// Globs can be used in the domain, but not in the port or the path. Globs are supported
	// as subdomains like '*.k8s.io' or 'k8s.*.io', and top-level-domains such as 'k8s.*'.
	// Matching partial subdomains like 'app*.k8s.io' is also supported. Each glob can only match
	// a single subdomain segment, so *.io does not match *.k8s.io.
	//
	// A match exists between an image and a matchImage when all of the below are true:
	// - Both contain the same number of domain parts and each part matches.
	// - The URL path of an imageMatch must be a prefix of the target image URL path.
	// - If the imageMatch contains a port, then the port must match in the image as well.
	//
	// Example values of matchImages:
	//   - 123456789.dkr.ecr.us-east-1.amazonaws.com
	//   - *.azurecr.io
	//   - gcr.io
	//   - *.*.registry.io
	//   - registry.io:8080/path
	MatchImages []string

	// defaultCacheDuration is the default duration the plugin will cache credentials in-memory
	// if a cache duration is not provided in the plugin response. This field is required.
	DefaultCacheDuration *metav1.Duration

	// Required input version of the exec CredentialProviderRequest. The returned CredentialProviderResponse
	// MUST use the same encoding version as the input. Current supported values are:
	// - credentialprovider.kubelet.k8s.io/v1alpha1
	APIVersion string

	// Arguments to pass to the command when executing it.
	// +optional
	Args []string

	// Env defines additional environment variables to expose to the process. These
	// are unioned with the host's environment, as well as variables client-go uses
	// to pass argument to the plugin.
	// +optional
	Env []ExecEnvVar
}

// ExecEnvVar is used for setting environment variables when executing an exec-based
// credential plugin.
type ExecEnvVar struct {
	Name  string
	Value string
}
