Update vendor

vendor/k8s.io/apiserver/LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
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+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+   limitations under the License.

vendor/k8s.io/apiserver/pkg/apis/audit/OWNERS

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+# See the OWNERS docs at https://go.k8s.io/owners
+
+# approval on api packages bubbles to api-approvers
+reviewers:
+- sig-auth-audit-approvers
+- sig-auth-audit-reviewers
+labels:
+- sig/auth
+

vendor/k8s.io/apiserver/pkg/apis/audit/doc.go

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+/*
+Copyright 2017 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.
+*/
+
+// +k8s:deepcopy-gen=package
+// +groupName=audit.k8s.io
+
+package audit // import "k8s.io/apiserver/pkg/apis/audit"

vendor/k8s.io/apiserver/pkg/apis/audit/helpers.go

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+/*
+Copyright 2017 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 audit
+
+func ordLevel(l Level) int {
+	switch l {
+	case LevelMetadata:
+		return 1
+	case LevelRequest:
+		return 2
+	case LevelRequestResponse:
+		return 3
+	default:
+		return 0
+	}
+}
+
+func (a Level) Less(b Level) bool {
+	return ordLevel(a) < ordLevel(b)
+}
+
+func (a Level) GreaterOrEqual(b Level) bool {
+	return ordLevel(a) >= ordLevel(b)
+}

vendor/k8s.io/apiserver/pkg/apis/audit/register.go

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+/*
+Copyright 2017 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 audit
+
+import (
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+// GroupName is the group name use in this package
+const GroupName = "audit.k8s.io"
+
+// SchemeGroupVersion is group version used to register these objects
+var SchemeGroupVersion = schema.GroupVersion{Group: GroupName, Version: runtime.APIVersionInternal}
+
+// Kind takes an unqualified kind and returns a Group qualified GroupKind
+func Kind(kind string) schema.GroupKind {
+	return SchemeGroupVersion.WithKind(kind).GroupKind()
+}
+
+// Resource takes an unqualified resource and returns a Group qualified GroupResource
+func Resource(resource string) schema.GroupResource {
+	return SchemeGroupVersion.WithResource(resource).GroupResource()
+}
+
+var (
+	SchemeBuilder = runtime.NewSchemeBuilder(addKnownTypes)
+	AddToScheme   = SchemeBuilder.AddToScheme
+)
+
+func addKnownTypes(scheme *runtime.Scheme) error {
+	scheme.AddKnownTypes(SchemeGroupVersion,
+		&Event{},
+		&EventList{},
+		&Policy{},
+		&PolicyList{},
+	)
+	return nil
+}

vendor/k8s.io/apiserver/pkg/apis/audit/types.go

@@ -0,0 +1,286 @@
+/*
+Copyright 2017 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 audit
+
+import (
+	authnv1 "k8s.io/api/authentication/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/types"
+)
+
+// Header keys used by the audit system.
+const (
+	// Header to hold the audit ID as the request is propagated through the serving hierarchy. The
+	// Audit-ID header should be set by the first server to receive the request (e.g. the federation
+	// server or kube-aggregator).
+	//
+	// Audit ID is also returned to client by http response header.
+	// It's not guaranteed Audit-Id http header is sent for all requests. When kube-apiserver didn't
+	// audit the events according to the audit policy, no Audit-ID is returned. Also, for request to
+	// pods/exec, pods/attach, pods/proxy, kube-apiserver works like a proxy and redirect the request
+	// to kubelet node, users will only get http headers sent from kubelet node, so no Audit-ID is
+	// sent when users run command like "kubectl exec" or "kubectl attach".
+	HeaderAuditID = "Audit-ID"
+)
+
+// Level defines the amount of information logged during auditing
+type Level string
+
+// Valid audit levels
+const (
+	// LevelNone disables auditing
+	LevelNone Level = "None"
+	// LevelMetadata provides the basic level of auditing.
+	LevelMetadata Level = "Metadata"
+	// LevelRequest provides Metadata level of auditing, and additionally
+	// logs the request object (does not apply for non-resource requests).
+	LevelRequest Level = "Request"
+	// LevelRequestResponse provides Request level of auditing, and additionally
+	// logs the response object (does not apply for non-resource requests).
+	LevelRequestResponse Level = "RequestResponse"
+)
+
+// Stage defines the stages in request handling that audit events may be generated.
+type Stage string
+
+// Valid audit stages.
+const (
+	// The stage for events generated as soon as the audit handler receives the request, and before it
+	// is delegated down the handler chain.
+	StageRequestReceived = "RequestReceived"
+	// The stage for events generated once the response headers are sent, but before the response body
+	// is sent. This stage is only generated for long-running requests (e.g. watch).
+	StageResponseStarted = "ResponseStarted"
+	// The stage for events generated once the response body has been completed, and no more bytes
+	// will be sent.
+	StageResponseComplete = "ResponseComplete"
+	// The stage for events generated when a panic occurred.
+	StagePanic = "Panic"
+)
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+
+// Event captures all the information that can be included in an API audit log.
+type Event struct {
+	metav1.TypeMeta
+
+	// AuditLevel at which event was generated
+	Level Level
+
+	// Unique audit ID, generated for each request.
+	AuditID types.UID
+	// Stage of the request handling when this event instance was generated.
+	Stage Stage
+
+	// RequestURI is the request URI as sent by the client to a server.
+	RequestURI string
+	// Verb is the kubernetes verb associated with the request.
+	// For non-resource requests, this is the lower-cased HTTP method.
+	Verb string
+	// Authenticated user information.
+	User authnv1.UserInfo
+	// Impersonated user information.
+	// +optional
+	ImpersonatedUser *authnv1.UserInfo
+	// Source IPs, from where the request originated and intermediate proxies.
+	// +optional
+	SourceIPs []string
+	// UserAgent records the user agent string reported by the client.
+	// Note that the UserAgent is provided by the client, and must not be trusted.
+	// +optional
+	UserAgent string
+	// Object reference this request is targeted at.
+	// Does not apply for List-type requests, or non-resource requests.
+	// +optional
+	ObjectRef *ObjectReference
+	// The response status, populated even when the ResponseObject is not a Status type.
+	// For successful responses, this will only include the Code. For non-status type
+	// error responses, this will be auto-populated with the error Message.
+	// +optional
+	ResponseStatus *metav1.Status
+
+	// API object from the request, in JSON format. The RequestObject is recorded as-is in the request
+	// (possibly re-encoded as JSON), prior to version conversion, defaulting, admission or
+	// merging. It is an external versioned object type, and may not be a valid object on its own.
+	// Omitted for non-resource requests.  Only logged at Request Level and higher.
+	// +optional
+	RequestObject *runtime.Unknown
+	// API object returned in the response, in JSON. The ResponseObject is recorded after conversion
+	// to the external type, and serialized as JSON. Omitted for non-resource requests.  Only logged
+	// at Response Level.
+	// +optional
+	ResponseObject *runtime.Unknown
+
+	// Time the request reached the apiserver.
+	RequestReceivedTimestamp metav1.MicroTime
+	// Time the request reached current audit stage.
+	StageTimestamp metav1.MicroTime
+
+	// Annotations is an unstructured key value map stored with an audit event that may be set by
+	// plugins invoked in the request serving chain, including authentication, authorization and
+	// admission plugins. Note that these annotations are for the audit event, and do not correspond
+	// to the metadata.annotations of the submitted object. Keys should uniquely identify the informing
+	// component to avoid name collisions (e.g. podsecuritypolicy.admission.k8s.io/policy). Values
+	// should be short. Annotations are included in the Metadata level.
+	// +optional
+	Annotations map[string]string
+}
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+
+// EventList is a list of audit Events.
+type EventList struct {
+	metav1.TypeMeta
+	// +optional
+	metav1.ListMeta
+
+	Items []Event
+}
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+
+// Policy defines the configuration of audit logging, and the rules for how different request
+// categories are logged.
+type Policy struct {
+	metav1.TypeMeta
+	// ObjectMeta is included for interoperability with API infrastructure.
+	// +optional
+	metav1.ObjectMeta
+
+	// Rules specify the audit Level a request should be recorded at.
+	// A request may match multiple rules, in which case the FIRST matching rule is used.
+	// The default audit level is None, but can be overridden by a catch-all rule at the end of the list.
+	// PolicyRules are strictly ordered.
+	Rules []PolicyRule
+
+	// OmitStages is a list of stages for which no events are created. Note that this can also
+	// be specified per rule in which case the union of both are omitted.
+	// +optional
+	OmitStages []Stage
+}
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+
+// PolicyList is a list of audit Policies.
+type PolicyList struct {
+	metav1.TypeMeta
+	// +optional
+	metav1.ListMeta
+
+	Items []Policy
+}
+
+// PolicyRule maps requests based off metadata to an audit Level.
+// Requests must match the rules of every field (an intersection of rules).
+type PolicyRule struct {
+	// The Level that requests matching this rule are recorded at.
+	Level Level
+
+	// The users (by authenticated user name) this rule applies to.
+	// An empty list implies every user.
+	// +optional
+	Users []string
+	// The user groups this rule applies to. A user is considered matching
+	// if it is a member of any of the UserGroups.
+	// An empty list implies every user group.
+	// +optional
+	UserGroups []string
+
+	// The verbs that match this rule.
+	// An empty list implies every verb.
+	// +optional
+	Verbs []string
+
+	// Rules can apply to API resources (such as "pods" or "secrets"),
+	// non-resource URL paths (such as "/api"), or neither, but not both.
+	// If neither is specified, the rule is treated as a default for all URLs.
+
+	// Resources that this rule matches. An empty list implies all kinds in all API groups.
+	// +optional
+	Resources []GroupResources
+	// Namespaces that this rule matches.
+	// The empty string "" matches non-namespaced resources.
+	// An empty list implies every namespace.
+	// +optional
+	Namespaces []string
+
+	// NonResourceURLs is a set of URL paths that should be audited.
+	// *s are allowed, but only as the full, final step in the path.
+	// Examples:
+	//  "/metrics" - Log requests for apiserver metrics
+	//  "/healthz*" - Log all health checks
+	// +optional
+	NonResourceURLs []string
+
+	// OmitStages is a list of stages for which no events are created. Note that this can also
+	// be specified policy wide in which case the union of both are omitted.
+	// An empty list means no restrictions will apply.
+	// +optional
+	OmitStages []Stage
+}
+
+// GroupResources represents resource kinds in an API group.
+type GroupResources struct {
+	// Group is the name of the API group that contains the resources.
+	// The empty string represents the core API group.
+	// +optional
+	Group string
+	// Resources is a list of resources this rule applies to.
+	//
+	// For example:
+	// 'pods' matches pods.
+	// 'pods/log' matches the log subresource of pods.
+	// '*' matches all resources and their subresources.
+	// 'pods/*' matches all subresources of pods.
+	// '*/scale' matches all scale subresources.
+	//
+	// If wildcard is present, the validation rule will ensure resources do not
+	// overlap with each other.
+	//
+	// An empty list implies all resources and subresources in this API groups apply.
+	// +optional
+	Resources []string
+	// ResourceNames is a list of resource instance names that the policy matches.
+	// Using this field requires Resources to be specified.
+	// An empty list implies that every instance of the resource is matched.
+	// +optional
+	ResourceNames []string
+}
+
+// ObjectReference contains enough information to let you inspect or modify the referred object.
+type ObjectReference struct {
+	// +optional
+	Resource string
+	// +optional
+	Namespace string
+	// +optional
+	Name string
+	// +optional
+	UID types.UID
+	// APIGroup is the name of the API group that contains the referred object.
+	// The empty string represents the core API group.
+	// +optional
+	APIGroup string
+	// APIVersion is the version of the API group that contains the referred object.
+	// +optional
+	APIVersion string
+	// +optional
+	ResourceVersion string
+	// +optional
+	Subresource string
+}

vendor/k8s.io/apiserver/pkg/apis/audit/zz_generated.deepcopy.go

@@ -0,0 +1,291 @@
+// +build !ignore_autogenerated
+
+/*
+Copyright 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.
+*/
+
+// Code generated by deepcopy-gen. DO NOT EDIT.
+
+package audit
+
+import (
+	v1 "k8s.io/api/authentication/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	runtime "k8s.io/apimachinery/pkg/runtime"
+)
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *Event) DeepCopyInto(out *Event) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.User.DeepCopyInto(&out.User)
+	if in.ImpersonatedUser != nil {
+		in, out := &in.ImpersonatedUser, &out.ImpersonatedUser
+		*out = new(v1.UserInfo)
+		(*in).DeepCopyInto(*out)
+	}
+	if in.SourceIPs != nil {
+		in, out := &in.SourceIPs, &out.SourceIPs
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	if in.ObjectRef != nil {
+		in, out := &in.ObjectRef, &out.ObjectRef
+		*out = new(ObjectReference)
+		**out = **in
+	}
+	if in.ResponseStatus != nil {
+		in, out := &in.ResponseStatus, &out.ResponseStatus
+		*out = new(metav1.Status)
+		(*in).DeepCopyInto(*out)
+	}
+	if in.RequestObject != nil {
+		in, out := &in.RequestObject, &out.RequestObject
+		*out = new(runtime.Unknown)
+		(*in).DeepCopyInto(*out)
+	}
+	if in.ResponseObject != nil {
+		in, out := &in.ResponseObject, &out.ResponseObject
+		*out = new(runtime.Unknown)
+		(*in).DeepCopyInto(*out)
+	}
+	in.RequestReceivedTimestamp.DeepCopyInto(&out.RequestReceivedTimestamp)
+	in.StageTimestamp.DeepCopyInto(&out.StageTimestamp)
+	if in.Annotations != nil {
+		in, out := &in.Annotations, &out.Annotations
+		*out = make(map[string]string, len(*in))
+		for key, val := range *in {
+			(*out)[key] = val
+		}
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new Event.
+func (in *Event) DeepCopy() *Event {
+	if in == nil {
+		return nil
+	}
+	out := new(Event)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *Event) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *EventList) DeepCopyInto(out *EventList) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.ListMeta.DeepCopyInto(&out.ListMeta)
+	if in.Items != nil {
+		in, out := &in.Items, &out.Items
+		*out = make([]Event, len(*in))
+		for i := range *in {
+			(*in)[i].DeepCopyInto(&(*out)[i])
+		}
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new EventList.
+func (in *EventList) DeepCopy() *EventList {
+	if in == nil {
+		return nil
+	}
+	out := new(EventList)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *EventList) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *GroupResources) DeepCopyInto(out *GroupResources) {
+	*out = *in
+	if in.Resources != nil {
+		in, out := &in.Resources, &out.Resources
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	if in.ResourceNames != nil {
+		in, out := &in.ResourceNames, &out.ResourceNames
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new GroupResources.
+func (in *GroupResources) DeepCopy() *GroupResources {
+	if in == nil {
+		return nil
+	}
+	out := new(GroupResources)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *ObjectReference) DeepCopyInto(out *ObjectReference) {
+	*out = *in
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new ObjectReference.
+func (in *ObjectReference) DeepCopy() *ObjectReference {
+	if in == nil {
+		return nil
+	}
+	out := new(ObjectReference)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *Policy) DeepCopyInto(out *Policy) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.ObjectMeta.DeepCopyInto(&out.ObjectMeta)
+	if in.Rules != nil {
+		in, out := &in.Rules, &out.Rules
+		*out = make([]PolicyRule, len(*in))
+		for i := range *in {
+			(*in)[i].DeepCopyInto(&(*out)[i])
+		}
+	}
+	if in.OmitStages != nil {
+		in, out := &in.OmitStages, &out.OmitStages
+		*out = make([]Stage, len(*in))
+		copy(*out, *in)
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new Policy.
+func (in *Policy) DeepCopy() *Policy {
+	if in == nil {
+		return nil
+	}
+	out := new(Policy)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *Policy) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *PolicyList) DeepCopyInto(out *PolicyList) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.ListMeta.DeepCopyInto(&out.ListMeta)
+	if in.Items != nil {
+		in, out := &in.Items, &out.Items
+		*out = make([]Policy, len(*in))
+		for i := range *in {
+			(*in)[i].DeepCopyInto(&(*out)[i])
+		}
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new PolicyList.
+func (in *PolicyList) DeepCopy() *PolicyList {
+	if in == nil {
+		return nil
+	}
+	out := new(PolicyList)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *PolicyList) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *PolicyRule) DeepCopyInto(out *PolicyRule) {
+	*out = *in
+	if in.Users != nil {
+		in, out := &in.Users, &out.Users
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	if in.UserGroups != nil {
+		in, out := &in.UserGroups, &out.UserGroups
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	if in.Verbs != nil {
+		in, out := &in.Verbs, &out.Verbs
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	if in.Resources != nil {
+		in, out := &in.Resources, &out.Resources
+		*out = make([]GroupResources, len(*in))
+		for i := range *in {
+			(*in)[i].DeepCopyInto(&(*out)[i])
+		}
+	}
+	if in.Namespaces != nil {
+		in, out := &in.Namespaces, &out.Namespaces
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	if in.NonResourceURLs != nil {
+		in, out := &in.NonResourceURLs, &out.NonResourceURLs
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	if in.OmitStages != nil {
+		in, out := &in.OmitStages, &out.OmitStages
+		*out = make([]Stage, len(*in))
+		copy(*out, *in)
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new PolicyRule.
+func (in *PolicyRule) DeepCopy() *PolicyRule {
+	if in == nil {
+		return nil
+	}
+	out := new(PolicyRule)
+	in.DeepCopyInto(out)
+	return out
+}

vendor/k8s.io/apiserver/pkg/authentication/authenticator/audagnostic.go

@@ -0,0 +1,90 @@
+/*
+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 authenticator
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+)
+
+func authenticate(ctx context.Context, implicitAuds Audiences, authenticate func() (*Response, bool, error)) (*Response, bool, error) {
+	targetAuds, ok := AudiencesFrom(ctx)
+	// We can remove this once api audiences is never empty. That will probably
+	// be N releases after TokenRequest is GA.
+	if !ok {
+		return authenticate()
+	}
+	auds := implicitAuds.Intersect(targetAuds)
+	if len(auds) == 0 {
+		return nil, false, nil
+	}
+	resp, ok, err := authenticate()
+	if err != nil || !ok {
+		return nil, false, err
+	}
+	if len(resp.Audiences) > 0 {
+		// maybe the authenticator was audience aware after all.
+		return nil, false, fmt.Errorf("audience agnostic authenticator wrapped an authenticator that returned audiences: %q", resp.Audiences)
+	}
+	resp.Audiences = auds
+	return resp, true, nil
+}
+
+type audAgnosticRequestAuthenticator struct {
+	implicit Audiences
+	delegate Request
+}
+
+var _ = Request(&audAgnosticRequestAuthenticator{})
+
+func (a *audAgnosticRequestAuthenticator) AuthenticateRequest(req *http.Request) (*Response, bool, error) {
+	return authenticate(req.Context(), a.implicit, func() (*Response, bool, error) {
+		return a.delegate.AuthenticateRequest(req)
+	})
+}
+
+// WrapAudienceAgnosticRequest wraps an audience agnostic request authenticator
+// to restrict its accepted audiences to a set of implicit audiences.
+func WrapAudienceAgnosticRequest(implicit Audiences, delegate Request) Request {
+	return &audAgnosticRequestAuthenticator{
+		implicit: implicit,
+		delegate: delegate,
+	}
+}
+
+type audAgnosticTokenAuthenticator struct {
+	implicit Audiences
+	delegate Token
+}
+
+var _ = Token(&audAgnosticTokenAuthenticator{})
+
+func (a *audAgnosticTokenAuthenticator) AuthenticateToken(ctx context.Context, tok string) (*Response, bool, error) {
+	return authenticate(ctx, a.implicit, func() (*Response, bool, error) {
+		return a.delegate.AuthenticateToken(ctx, tok)
+	})
+}
+
+// WrapAudienceAgnosticToken wraps an audience agnostic token authenticator to
+// restrict its accepted audiences to a set of implicit audiences.
+func WrapAudienceAgnosticToken(implicit Audiences, delegate Token) Token {
+	return &audAgnosticTokenAuthenticator{
+		implicit: implicit,
+		delegate: delegate,
+	}
+}

vendor/k8s.io/apiserver/pkg/authentication/authenticator/audiences.go

@@ -0,0 +1,63 @@
+/*
+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 authenticator
+
+import "context"
+
+// Audiences is a container for the Audiences of a token.
+type Audiences []string
+
+// The key type is unexported to prevent collisions
+type key int
+
+const (
+	// audiencesKey is the context key for request audiences.
+	audiencesKey key = iota
+)
+
+// WithAudiences returns a context that stores a request's expected audiences.
+func WithAudiences(ctx context.Context, auds Audiences) context.Context {
+	return context.WithValue(ctx, audiencesKey, auds)
+}
+
+// AudiencesFrom returns a request's expected audiences stored in the request context.
+func AudiencesFrom(ctx context.Context) (Audiences, bool) {
+	auds, ok := ctx.Value(audiencesKey).(Audiences)
+	return auds, ok
+}
+
+// Has checks if Audiences contains a specific audiences.
+func (a Audiences) Has(taud string) bool {
+	for _, aud := range a {
+		if aud == taud {
+			return true
+		}
+	}
+	return false
+}
+
+// Intersect intersects Audiences with a target Audiences and returns all
+// elements in both.
+func (a Audiences) Intersect(tauds Audiences) Audiences {
+	selected := Audiences{}
+	for _, taud := range tauds {
+		if a.Has(taud) {
+			selected = append(selected, taud)
+		}
+	}
+	return selected
+}

vendor/k8s.io/apiserver/pkg/authentication/authenticator/interfaces.go

@@ -0,0 +1,80 @@
+/*
+Copyright 2014 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 authenticator
+
+import (
+	"context"
+	"net/http"
+
+	"k8s.io/apiserver/pkg/authentication/user"
+)
+
+// Token checks a string value against a backing authentication store and
+// returns a Response or an error if the token could not be checked.
+type Token interface {
+	AuthenticateToken(ctx context.Context, token string) (*Response, bool, error)
+}
+
+// Request attempts to extract authentication information from a request and
+// returns a Response or an error if the request could not be checked.
+type Request interface {
+	AuthenticateRequest(req *http.Request) (*Response, bool, error)
+}
+
+// Password checks a username and password against a backing authentication
+// store and returns a Response or an error if the password could not be
+// checked.
+type Password interface {
+	AuthenticatePassword(ctx context.Context, user, password string) (*Response, bool, error)
+}
+
+// TokenFunc is a function that implements the Token interface.
+type TokenFunc func(ctx context.Context, token string) (*Response, bool, error)
+
+// AuthenticateToken implements authenticator.Token.
+func (f TokenFunc) AuthenticateToken(ctx context.Context, token string) (*Response, bool, error) {
+	return f(ctx, token)
+}
+
+// RequestFunc is a function that implements the Request interface.
+type RequestFunc func(req *http.Request) (*Response, bool, error)
+
+// AuthenticateRequest implements authenticator.Request.
+func (f RequestFunc) AuthenticateRequest(req *http.Request) (*Response, bool, error) {
+	return f(req)
+}
+
+// PasswordFunc is a function that implements the Password interface.
+type PasswordFunc func(ctx context.Context, user, password string) (*Response, bool, error)
+
+// AuthenticatePassword implements authenticator.Password.
+func (f PasswordFunc) AuthenticatePassword(ctx context.Context, user, password string) (*Response, bool, error) {
+	return f(ctx, user, password)
+}
+
+// Response is the struct returned by authenticator interfaces upon successful
+// authentication. It contains information about whether the authenticator
+// authenticated the request, information about the context of the
+// authentication, and information about the authenticated user.
+type Response struct {
+	// Audiences is the set of audiences the authenticator was able to validate
+	// the token against. If the authenticator is not audience aware, this field
+	// will be empty.
+	Audiences Audiences
+	// User is the UserInfo associated with the authentication context.
+	User user.Info
+}

vendor/k8s.io/apiserver/pkg/authentication/token/cache/cache_simple.go

@@ -0,0 +1,49 @@
+/*
+Copyright 2017 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 cache
+
+import (
+	"time"
+
+	utilcache "k8s.io/apimachinery/pkg/util/cache"
+	"k8s.io/apimachinery/pkg/util/clock"
+)
+
+type simpleCache struct {
+	cache *utilcache.Expiring
+}
+
+func newSimpleCache(clock clock.Clock) cache {
+	return &simpleCache{cache: utilcache.NewExpiringWithClock(clock)}
+}
+
+func (c *simpleCache) get(key string) (*cacheRecord, bool) {
+	record, ok := c.cache.Get(key)
+	if !ok {
+		return nil, false
+	}
+	value, ok := record.(*cacheRecord)
+	return value, ok
+}
+
+func (c *simpleCache) set(key string, value *cacheRecord, ttl time.Duration) {
+	c.cache.Set(key, value, ttl)
+}
+
+func (c *simpleCache) remove(key string) {
+	c.cache.Delete(key)
+}

vendor/k8s.io/apiserver/pkg/authentication/token/cache/cache_striped.go

@@ -0,0 +1,60 @@
+/*
+Copyright 2017 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 cache
+
+import (
+	"hash/fnv"
+	"time"
+)
+
+// split cache lookups across N striped caches
+type stripedCache struct {
+	stripeCount uint32
+	hashFunc    func(string) uint32
+	caches      []cache
+}
+
+type hashFunc func(string) uint32
+type newCacheFunc func() cache
+
+func newStripedCache(stripeCount int, hash hashFunc, newCacheFunc newCacheFunc) cache {
+	caches := []cache{}
+	for i := 0; i < stripeCount; i++ {
+		caches = append(caches, newCacheFunc())
+	}
+	return &stripedCache{
+		stripeCount: uint32(stripeCount),
+		hashFunc:    hash,
+		caches:      caches,
+	}
+}
+
+func (c *stripedCache) get(key string) (*cacheRecord, bool) {
+	return c.caches[c.hashFunc(key)%c.stripeCount].get(key)
+}
+func (c *stripedCache) set(key string, value *cacheRecord, ttl time.Duration) {
+	c.caches[c.hashFunc(key)%c.stripeCount].set(key, value, ttl)
+}
+func (c *stripedCache) remove(key string) {
+	c.caches[c.hashFunc(key)%c.stripeCount].remove(key)
+}
+
+func fnvHashFunc(key string) uint32 {
+	f := fnv.New32()
+	f.Write([]byte(key))
+	return f.Sum32()
+}

vendor/k8s.io/apiserver/pkg/authentication/token/cache/cached_token_authenticator.go

@@ -0,0 +1,174 @@
+/*
+Copyright 2017 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 cache
+
+import (
+	"context"
+	"crypto/hmac"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/binary"
+	"hash"
+	"io"
+	"sync"
+	"time"
+	"unsafe"
+
+	utilclock "k8s.io/apimachinery/pkg/util/clock"
+	"k8s.io/apiserver/pkg/authentication/authenticator"
+)
+
+// cacheRecord holds the three return values of the authenticator.Token AuthenticateToken method
+type cacheRecord struct {
+	resp *authenticator.Response
+	ok   bool
+	err  error
+}
+
+type cachedTokenAuthenticator struct {
+	authenticator authenticator.Token
+
+	cacheErrs  bool
+	successTTL time.Duration
+	failureTTL time.Duration
+
+	cache cache
+
+	// hashPool is a per authenticator pool of hash.Hash (to avoid allocations from building the Hash)
+	// HMAC with SHA-256 and a random key is used to prevent precomputation and length extension attacks
+	// It also mitigates hash map DOS attacks via collisions (the inputs are supplied by untrusted users)
+	hashPool *sync.Pool
+}
+
+type cache interface {
+	// given a key, return the record, and whether or not it existed
+	get(key string) (value *cacheRecord, exists bool)
+	// caches the record for the key
+	set(key string, value *cacheRecord, ttl time.Duration)
+	// removes the record for the key
+	remove(key string)
+}
+
+// New returns a token authenticator that caches the results of the specified authenticator. A ttl of 0 bypasses the cache.
+func New(authenticator authenticator.Token, cacheErrs bool, successTTL, failureTTL time.Duration) authenticator.Token {
+	return newWithClock(authenticator, cacheErrs, successTTL, failureTTL, utilclock.RealClock{})
+}
+
+func newWithClock(authenticator authenticator.Token, cacheErrs bool, successTTL, failureTTL time.Duration, clock utilclock.Clock) authenticator.Token {
+	randomCacheKey := make([]byte, 32)
+	if _, err := rand.Read(randomCacheKey); err != nil {
+		panic(err) // rand should never fail
+	}
+
+	return &cachedTokenAuthenticator{
+		authenticator: authenticator,
+		cacheErrs:     cacheErrs,
+		successTTL:    successTTL,
+		failureTTL:    failureTTL,
+		// Cache performance degrades noticeably when the number of
+		// tokens in operation exceeds the size of the cache. It is
+		// cheap to make the cache big in the second dimension below,
+		// the memory is only consumed when that many tokens are being
+		// used. Currently we advertise support 5k nodes and 10k
+		// namespaces; a 32k entry cache is therefore a 2x safety
+		// margin.
+		cache: newStripedCache(32, fnvHashFunc, func() cache { return newSimpleCache(clock) }),
+
+		hashPool: &sync.Pool{
+			New: func() interface{} {
+				return hmac.New(sha256.New, randomCacheKey)
+			},
+		},
+	}
+}
+
+// AuthenticateToken implements authenticator.Token
+func (a *cachedTokenAuthenticator) AuthenticateToken(ctx context.Context, token string) (*authenticator.Response, bool, error) {
+	auds, _ := authenticator.AudiencesFrom(ctx)
+
+	key := keyFunc(a.hashPool, auds, token)
+	if record, ok := a.cache.get(key); ok {
+		return record.resp, record.ok, record.err
+	}
+
+	resp, ok, err := a.authenticator.AuthenticateToken(ctx, token)
+	if !a.cacheErrs && err != nil {
+		return resp, ok, err
+	}
+
+	switch {
+	case ok && a.successTTL > 0:
+		a.cache.set(key, &cacheRecord{resp: resp, ok: ok, err: err}, a.successTTL)
+	case !ok && a.failureTTL > 0:
+		a.cache.set(key, &cacheRecord{resp: resp, ok: ok, err: err}, a.failureTTL)
+	}
+
+	return resp, ok, err
+}
+
+// keyFunc generates a string key by hashing the inputs.
+// This lowers the memory requirement of the cache and keeps tokens out of memory.
+func keyFunc(hashPool *sync.Pool, auds []string, token string) string {
+	h := hashPool.Get().(hash.Hash)
+
+	h.Reset()
+
+	// try to force stack allocation
+	var a [4]byte
+	b := a[:]
+
+	writeLengthPrefixedString(h, b, token)
+	// encode the length of audiences to avoid ambiguities
+	writeLength(h, b, len(auds))
+	for _, aud := range auds {
+		writeLengthPrefixedString(h, b, aud)
+	}
+
+	key := toString(h.Sum(nil)) // skip base64 encoding to save an allocation
+
+	hashPool.Put(h)
+
+	return key
+}
+
+// writeLengthPrefixedString writes s with a length prefix to prevent ambiguities, i.e. "xy" + "z" == "x" + "yz"
+// the length of b is assumed to be 4 (b is mutated by this function to store the length of s)
+func writeLengthPrefixedString(w io.Writer, b []byte, s string) {
+	writeLength(w, b, len(s))
+	if _, err := w.Write(toBytes(s)); err != nil {
+		panic(err) // Write() on hash never fails
+	}
+}
+
+// writeLength encodes length into b and then writes it via the given writer
+// the length of b is assumed to be 4
+func writeLength(w io.Writer, b []byte, length int) {
+	binary.BigEndian.PutUint32(b, uint32(length))
+	if _, err := w.Write(b); err != nil {
+		panic(err) // Write() on hash never fails
+	}
+}
+
+// toBytes performs unholy acts to avoid allocations
+func toBytes(s string) []byte {
+	return *(*[]byte)(unsafe.Pointer(&s))
+}
+
+// toString performs unholy acts to avoid allocations
+func toString(b []byte) string {
+	return *(*string)(unsafe.Pointer(&b))
+}

vendor/k8s.io/apiserver/pkg/authentication/user/doc.go

@@ -0,0 +1,19 @@
+/*
+Copyright 2014 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 user contains utilities for dealing with simple user exchange in the auth
+// packages. The user.Info interface defines an interface for exchanging that info.
+package user // import "k8s.io/apiserver/pkg/authentication/user"

vendor/k8s.io/apiserver/pkg/authentication/user/user.go

@@ -0,0 +1,83 @@
+/*
+Copyright 2014 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 user
+
+// Info describes a user that has been authenticated to the system.
+type Info interface {
+	// GetName returns the name that uniquely identifies this user among all
+	// other active users.
+	GetName() string
+	// GetUID returns a unique value for a particular user that will change
+	// if the user is removed from the system and another user is added with
+	// the same name.
+	GetUID() string
+	// GetGroups returns the names of the groups the user is a member of
+	GetGroups() []string
+
+	// GetExtra can contain any additional information that the authenticator
+	// thought was interesting.  One example would be scopes on a token.
+	// Keys in this map should be namespaced to the authenticator or
+	// authenticator/authorizer pair making use of them.
+	// For instance: "example.org/foo" instead of "foo"
+	// This is a map[string][]string because it needs to be serializeable into
+	// a SubjectAccessReviewSpec.authorization.k8s.io for proper authorization
+	// delegation flows
+	// In order to faithfully round-trip through an impersonation flow, these keys
+	// MUST be lowercase.
+	GetExtra() map[string][]string
+}
+
+// DefaultInfo provides a simple user information exchange object
+// for components that implement the UserInfo interface.
+type DefaultInfo struct {
+	Name   string
+	UID    string
+	Groups []string
+	Extra  map[string][]string
+}
+
+func (i *DefaultInfo) GetName() string {
+	return i.Name
+}
+
+func (i *DefaultInfo) GetUID() string {
+	return i.UID
+}
+
+func (i *DefaultInfo) GetGroups() []string {
+	return i.Groups
+}
+
+func (i *DefaultInfo) GetExtra() map[string][]string {
+	return i.Extra
+}
+
+// well-known user and group names
+const (
+	SystemPrivilegedGroup = "system:masters"
+	NodesGroup            = "system:nodes"
+	AllUnauthenticated    = "system:unauthenticated"
+	AllAuthenticated      = "system:authenticated"
+
+	Anonymous     = "system:anonymous"
+	APIServerUser = "system:apiserver"
+
+	// core kubernetes process identities
+	KubeProxy             = "system:kube-proxy"
+	KubeControllerManager = "system:kube-controller-manager"
+	KubeScheduler         = "system:kube-scheduler"
+)

vendor/k8s.io/apiserver/pkg/endpoints/request/OWNERS

@@ -0,0 +1,4 @@
+# See the OWNERS docs at https://go.k8s.io/owners
+
+reviewers:
+- sttts

vendor/k8s.io/apiserver/pkg/endpoints/request/context.go

@@ -0,0 +1,96 @@
+/*
+Copyright 2014 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 request
+
+import (
+	"context"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apiserver/pkg/apis/audit"
+	"k8s.io/apiserver/pkg/authentication/user"
+)
+
+// The key type is unexported to prevent collisions
+type key int
+
+const (
+	// namespaceKey is the context key for the request namespace.
+	namespaceKey key = iota
+
+	// userKey is the context key for the request user.
+	userKey
+
+	// auditKey is the context key for the audit event.
+	auditKey
+
+	// audiencesKey is the context key for request audiences.
+	audiencesKey
+)
+
+// NewContext instantiates a base context object for request flows.
+func NewContext() context.Context {
+	return context.TODO()
+}
+
+// NewDefaultContext instantiates a base context object for request flows in the default namespace
+func NewDefaultContext() context.Context {
+	return WithNamespace(NewContext(), metav1.NamespaceDefault)
+}
+
+// WithValue returns a copy of parent in which the value associated with key is val.
+func WithValue(parent context.Context, key interface{}, val interface{}) context.Context {
+	return context.WithValue(parent, key, val)
+}
+
+// WithNamespace returns a copy of parent in which the namespace value is set
+func WithNamespace(parent context.Context, namespace string) context.Context {
+	return WithValue(parent, namespaceKey, namespace)
+}
+
+// NamespaceFrom returns the value of the namespace key on the ctx
+func NamespaceFrom(ctx context.Context) (string, bool) {
+	namespace, ok := ctx.Value(namespaceKey).(string)
+	return namespace, ok
+}
+
+// NamespaceValue returns the value of the namespace key on the ctx, or the empty string if none
+func NamespaceValue(ctx context.Context) string {
+	namespace, _ := NamespaceFrom(ctx)
+	return namespace
+}
+
+// WithUser returns a copy of parent in which the user value is set
+func WithUser(parent context.Context, user user.Info) context.Context {
+	return WithValue(parent, userKey, user)
+}
+
+// UserFrom returns the value of the user key on the ctx
+func UserFrom(ctx context.Context) (user.Info, bool) {
+	user, ok := ctx.Value(userKey).(user.Info)
+	return user, ok
+}
+
+// WithAuditEvent returns set audit event struct.
+func WithAuditEvent(parent context.Context, ev *audit.Event) context.Context {
+	return WithValue(parent, auditKey, ev)
+}
+
+// AuditEventFrom returns the audit event struct on the ctx
+func AuditEventFrom(ctx context.Context) *audit.Event {
+	ev, _ := ctx.Value(auditKey).(*audit.Event)
+	return ev
+}

vendor/k8s.io/apiserver/pkg/endpoints/request/doc.go

@@ -0,0 +1,20 @@
+/*
+Copyright 2016 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 request contains everything around extracting info from
+// a http request object.
+// TODO: this package is temporary. Handlers must move into pkg/apiserver/handlers to avoid dependency cycle
+package request // import "k8s.io/apiserver/pkg/endpoints/request"

vendor/k8s.io/apiserver/pkg/endpoints/request/requestinfo.go

@@ -0,0 +1,274 @@
+/*
+Copyright 2016 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 request
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"strings"
+
+	"k8s.io/apimachinery/pkg/api/validation/path"
+	metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
+	metainternalversionscheme "k8s.io/apimachinery/pkg/apis/meta/internalversion/scheme"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/sets"
+
+	"k8s.io/klog"
+)
+
+// LongRunningRequestCheck is a predicate which is true for long-running http requests.
+type LongRunningRequestCheck func(r *http.Request, requestInfo *RequestInfo) bool
+
+type RequestInfoResolver interface {
+	NewRequestInfo(req *http.Request) (*RequestInfo, error)
+}
+
+// RequestInfo holds information parsed from the http.Request
+type RequestInfo struct {
+	// IsResourceRequest indicates whether or not the request is for an API resource or subresource
+	IsResourceRequest bool
+	// Path is the URL path of the request
+	Path string
+	// Verb is the kube verb associated with the request for API requests, not the http verb.  This includes things like list and watch.
+	// for non-resource requests, this is the lowercase http verb
+	Verb string
+
+	APIPrefix  string
+	APIGroup   string
+	APIVersion string
+	Namespace  string
+	// Resource is the name of the resource being requested.  This is not the kind.  For example: pods
+	Resource string
+	// Subresource is the name of the subresource being requested.  This is a different resource, scoped to the parent resource, but it may have a different kind.
+	// For instance, /pods has the resource "pods" and the kind "Pod", while /pods/foo/status has the resource "pods", the sub resource "status", and the kind "Pod"
+	// (because status operates on pods). The binding resource for a pod though may be /pods/foo/binding, which has resource "pods", subresource "binding", and kind "Binding".
+	Subresource string
+	// Name is empty for some verbs, but if the request directly indicates a name (not in body content) then this field is filled in.
+	Name string
+	// Parts are the path parts for the request, always starting with /{resource}/{name}
+	Parts []string
+}
+
+// specialVerbs contains just strings which are used in REST paths for special actions that don't fall under the normal
+// CRUDdy GET/POST/PUT/DELETE actions on REST objects.
+// TODO: find a way to keep this up to date automatically.  Maybe dynamically populate list as handlers added to
+// master's Mux.
+var specialVerbs = sets.NewString("proxy", "watch")
+
+// specialVerbsNoSubresources contains root verbs which do not allow subresources
+var specialVerbsNoSubresources = sets.NewString("proxy")
+
+// namespaceSubresources contains subresources of namespace
+// this list allows the parser to distinguish between a namespace subresource, and a namespaced resource
+var namespaceSubresources = sets.NewString("status", "finalize")
+
+// NamespaceSubResourcesForTest exports namespaceSubresources for testing in pkg/master/master_test.go, so we never drift
+var NamespaceSubResourcesForTest = sets.NewString(namespaceSubresources.List()...)
+
+type RequestInfoFactory struct {
+	APIPrefixes          sets.String // without leading and trailing slashes
+	GrouplessAPIPrefixes sets.String // without leading and trailing slashes
+}
+
+// TODO write an integration test against the swagger doc to test the RequestInfo and match up behavior to responses
+// NewRequestInfo returns the information from the http request.  If error is not nil, RequestInfo holds the information as best it is known before the failure
+// It handles both resource and non-resource requests and fills in all the pertinent information for each.
+// Valid Inputs:
+// Resource paths
+// /apis/{api-group}/{version}/namespaces
+// /api/{version}/namespaces
+// /api/{version}/namespaces/{namespace}
+// /api/{version}/namespaces/{namespace}/{resource}
+// /api/{version}/namespaces/{namespace}/{resource}/{resourceName}
+// /api/{version}/{resource}
+// /api/{version}/{resource}/{resourceName}
+//
+// Special verbs without subresources:
+// /api/{version}/proxy/{resource}/{resourceName}
+// /api/{version}/proxy/namespaces/{namespace}/{resource}/{resourceName}
+//
+// Special verbs with subresources:
+// /api/{version}/watch/{resource}
+// /api/{version}/watch/namespaces/{namespace}/{resource}
+//
+// NonResource paths
+// /apis/{api-group}/{version}
+// /apis/{api-group}
+// /apis
+// /api/{version}
+// /api
+// /healthz
+// /
+func (r *RequestInfoFactory) NewRequestInfo(req *http.Request) (*RequestInfo, error) {
+	// start with a non-resource request until proven otherwise
+	requestInfo := RequestInfo{
+		IsResourceRequest: false,
+		Path:              req.URL.Path,
+		Verb:              strings.ToLower(req.Method),
+	}
+
+	currentParts := splitPath(req.URL.Path)
+	if len(currentParts) < 3 {
+		// return a non-resource request
+		return &requestInfo, nil
+	}
+
+	if !r.APIPrefixes.Has(currentParts[0]) {
+		// return a non-resource request
+		return &requestInfo, nil
+	}
+	requestInfo.APIPrefix = currentParts[0]
+	currentParts = currentParts[1:]
+
+	if !r.GrouplessAPIPrefixes.Has(requestInfo.APIPrefix) {
+		// one part (APIPrefix) has already been consumed, so this is actually "do we have four parts?"
+		if len(currentParts) < 3 {
+			// return a non-resource request
+			return &requestInfo, nil
+		}
+
+		requestInfo.APIGroup = currentParts[0]
+		currentParts = currentParts[1:]
+	}
+
+	requestInfo.IsResourceRequest = true
+	requestInfo.APIVersion = currentParts[0]
+	currentParts = currentParts[1:]
+
+	// handle input of form /{specialVerb}/*
+	if specialVerbs.Has(currentParts[0]) {
+		if len(currentParts) < 2 {
+			return &requestInfo, fmt.Errorf("unable to determine kind and namespace from url, %v", req.URL)
+		}
+
+		requestInfo.Verb = currentParts[0]
+		currentParts = currentParts[1:]
+
+	} else {
+		switch req.Method {
+		case "POST":
+			requestInfo.Verb = "create"
+		case "GET", "HEAD":
+			requestInfo.Verb = "get"
+		case "PUT":
+			requestInfo.Verb = "update"
+		case "PATCH":
+			requestInfo.Verb = "patch"
+		case "DELETE":
+			requestInfo.Verb = "delete"
+		default:
+			requestInfo.Verb = ""
+		}
+	}
+
+	// URL forms: /namespaces/{namespace}/{kind}/*, where parts are adjusted to be relative to kind
+	if currentParts[0] == "namespaces" {
+		if len(currentParts) > 1 {
+			requestInfo.Namespace = currentParts[1]
+
+			// if there is another step after the namespace name and it is not a known namespace subresource
+			// move currentParts to include it as a resource in its own right
+			if len(currentParts) > 2 && !namespaceSubresources.Has(currentParts[2]) {
+				currentParts = currentParts[2:]
+			}
+		}
+	} else {
+		requestInfo.Namespace = metav1.NamespaceNone
+	}
+
+	// parsing successful, so we now know the proper value for .Parts
+	requestInfo.Parts = currentParts
+
+	// parts look like: resource/resourceName/subresource/other/stuff/we/don't/interpret
+	switch {
+	case len(requestInfo.Parts) >= 3 && !specialVerbsNoSubresources.Has(requestInfo.Verb):
+		requestInfo.Subresource = requestInfo.Parts[2]
+		fallthrough
+	case len(requestInfo.Parts) >= 2:
+		requestInfo.Name = requestInfo.Parts[1]
+		fallthrough
+	case len(requestInfo.Parts) >= 1:
+		requestInfo.Resource = requestInfo.Parts[0]
+	}
+
+	// if there's no name on the request and we thought it was a get before, then the actual verb is a list or a watch
+	if len(requestInfo.Name) == 0 && requestInfo.Verb == "get" {
+		opts := metainternalversion.ListOptions{}
+		if err := metainternalversionscheme.ParameterCodec.DecodeParameters(req.URL.Query(), metav1.SchemeGroupVersion, &opts); err != nil {
+			// An error in parsing request will result in default to "list" and not setting "name" field.
+			klog.Errorf("Couldn't parse request %#v: %v", req.URL.Query(), err)
+			// Reset opts to not rely on partial results from parsing.
+			// However, if watch is set, let's report it.
+			opts = metainternalversion.ListOptions{}
+			if values := req.URL.Query()["watch"]; len(values) > 0 {
+				switch strings.ToLower(values[0]) {
+				case "false", "0":
+				default:
+					opts.Watch = true
+				}
+			}
+		}
+
+		if opts.Watch {
+			requestInfo.Verb = "watch"
+		} else {
+			requestInfo.Verb = "list"
+		}
+
+		if opts.FieldSelector != nil {
+			if name, ok := opts.FieldSelector.RequiresExactMatch("metadata.name"); ok {
+				if len(path.IsValidPathSegmentName(name)) == 0 {
+					requestInfo.Name = name
+				}
+			}
+		}
+	}
+	// if there's no name on the request and we thought it was a delete before, then the actual verb is deletecollection
+	if len(requestInfo.Name) == 0 && requestInfo.Verb == "delete" {
+		requestInfo.Verb = "deletecollection"
+	}
+
+	return &requestInfo, nil
+}
+
+type requestInfoKeyType int
+
+// requestInfoKey is the RequestInfo key for the context. It's of private type here. Because
+// keys are interfaces and interfaces are equal when the type and the value is equal, this
+// does not conflict with the keys defined in pkg/api.
+const requestInfoKey requestInfoKeyType = iota
+
+// WithRequestInfo returns a copy of parent in which the request info value is set
+func WithRequestInfo(parent context.Context, info *RequestInfo) context.Context {
+	return WithValue(parent, requestInfoKey, info)
+}
+
+// RequestInfoFrom returns the value of the RequestInfo key on the ctx
+func RequestInfoFrom(ctx context.Context) (*RequestInfo, bool) {
+	info, ok := ctx.Value(requestInfoKey).(*RequestInfo)
+	return info, ok
+}
+
+// splitPath returns the segments for a URL path.
+func splitPath(path string) []string {
+	path = strings.Trim(path, "/")
+	if path == "" {
+		return []string{}
+	}
+	return strings.Split(path, "/")
+}

vendor/k8s.io/apiserver/pkg/util/webhook/authentication.go

@@ -0,0 +1,234 @@
+/*
+Copyright 2017 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 webhook
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	corev1 "k8s.io/api/core/v1"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+	clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
+)
+
+// AuthenticationInfoResolverWrapper can be used to inject Dial function to the
+// rest.Config generated by the resolver.
+type AuthenticationInfoResolverWrapper func(AuthenticationInfoResolver) AuthenticationInfoResolver
+
+// NewDefaultAuthenticationInfoResolverWrapper builds a default authn resolver wrapper
+func NewDefaultAuthenticationInfoResolverWrapper(
+	proxyTransport *http.Transport,
+	kubeapiserverClientConfig *rest.Config) AuthenticationInfoResolverWrapper {
+
+	webhookAuthResolverWrapper := func(delegate AuthenticationInfoResolver) AuthenticationInfoResolver {
+		return &AuthenticationInfoResolverDelegator{
+			ClientConfigForFunc: func(hostPort string) (*rest.Config, error) {
+				if hostPort == "kubernetes.default.svc:443" {
+					return kubeapiserverClientConfig, nil
+				}
+				return delegate.ClientConfigFor(hostPort)
+			},
+			ClientConfigForServiceFunc: func(serviceName, serviceNamespace string, servicePort int) (*rest.Config, error) {
+				if serviceName == "kubernetes" && serviceNamespace == corev1.NamespaceDefault && servicePort == 443 {
+					return kubeapiserverClientConfig, nil
+				}
+				ret, err := delegate.ClientConfigForService(serviceName, serviceNamespace, servicePort)
+				if err != nil {
+					return nil, err
+				}
+				if proxyTransport != nil && proxyTransport.DialContext != nil {
+					ret.Dial = proxyTransport.DialContext
+				}
+				return ret, err
+			},
+		}
+	}
+	return webhookAuthResolverWrapper
+}
+
+// AuthenticationInfoResolver builds rest.Config base on the server or service
+// name and service namespace.
+type AuthenticationInfoResolver interface {
+	// ClientConfigFor builds rest.Config based on the hostPort.
+	ClientConfigFor(hostPort string) (*rest.Config, error)
+	// ClientConfigForService builds rest.Config based on the serviceName and
+	// serviceNamespace.
+	ClientConfigForService(serviceName, serviceNamespace string, servicePort int) (*rest.Config, error)
+}
+
+// AuthenticationInfoResolverDelegator implements AuthenticationInfoResolver.
+type AuthenticationInfoResolverDelegator struct {
+	ClientConfigForFunc        func(hostPort string) (*rest.Config, error)
+	ClientConfigForServiceFunc func(serviceName, serviceNamespace string, servicePort int) (*rest.Config, error)
+}
+
+// ClientConfigFor returns client config for given hostPort.
+func (a *AuthenticationInfoResolverDelegator) ClientConfigFor(hostPort string) (*rest.Config, error) {
+	return a.ClientConfigForFunc(hostPort)
+}
+
+// ClientConfigForService returns client config for given service.
+func (a *AuthenticationInfoResolverDelegator) ClientConfigForService(serviceName, serviceNamespace string, servicePort int) (*rest.Config, error) {
+	return a.ClientConfigForServiceFunc(serviceName, serviceNamespace, servicePort)
+}
+
+type defaultAuthenticationInfoResolver struct {
+	kubeconfig clientcmdapi.Config
+}
+
+// NewDefaultAuthenticationInfoResolver generates an AuthenticationInfoResolver
+// that builds rest.Config based on the kubeconfig file. kubeconfigFile is the
+// path to the kubeconfig.
+func NewDefaultAuthenticationInfoResolver(kubeconfigFile string) (AuthenticationInfoResolver, error) {
+	if len(kubeconfigFile) == 0 {
+		return &defaultAuthenticationInfoResolver{}, nil
+	}
+
+	loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
+	loadingRules.ExplicitPath = kubeconfigFile
+	loader := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, &clientcmd.ConfigOverrides{})
+	clientConfig, err := loader.RawConfig()
+	if err != nil {
+		return nil, err
+	}
+
+	return &defaultAuthenticationInfoResolver{kubeconfig: clientConfig}, nil
+}
+
+func (c *defaultAuthenticationInfoResolver) ClientConfigFor(hostPort string) (*rest.Config, error) {
+	return c.clientConfig(hostPort)
+}
+
+func (c *defaultAuthenticationInfoResolver) ClientConfigForService(serviceName, serviceNamespace string, servicePort int) (*rest.Config, error) {
+	return c.clientConfig(net.JoinHostPort(serviceName+"."+serviceNamespace+".svc", strconv.Itoa(servicePort)))
+}
+
+func (c *defaultAuthenticationInfoResolver) clientConfig(target string) (*rest.Config, error) {
+	// exact match
+	if authConfig, ok := c.kubeconfig.AuthInfos[target]; ok {
+		return restConfigFromKubeconfig(authConfig)
+	}
+
+	// star prefixed match
+	serverSteps := strings.Split(target, ".")
+	for i := 1; i < len(serverSteps); i++ {
+		nickName := "*." + strings.Join(serverSteps[i:], ".")
+		if authConfig, ok := c.kubeconfig.AuthInfos[nickName]; ok {
+			return restConfigFromKubeconfig(authConfig)
+		}
+	}
+
+	// If target included the default https port (443), search again without the port
+	if target, port, err := net.SplitHostPort(target); err == nil && port == "443" {
+		// exact match without port
+		if authConfig, ok := c.kubeconfig.AuthInfos[target]; ok {
+			return restConfigFromKubeconfig(authConfig)
+		}
+
+		// star prefixed match without port
+		serverSteps := strings.Split(target, ".")
+		for i := 1; i < len(serverSteps); i++ {
+			nickName := "*." + strings.Join(serverSteps[i:], ".")
+			if authConfig, ok := c.kubeconfig.AuthInfos[nickName]; ok {
+				return restConfigFromKubeconfig(authConfig)
+			}
+		}
+	}
+
+	// if we're trying to hit the kube-apiserver and there wasn't an explicit config, use the in-cluster config
+	if target == "kubernetes.default.svc:443" {
+		// if we can find an in-cluster-config use that.  If we can't, fall through.
+		inClusterConfig, err := rest.InClusterConfig()
+		if err == nil {
+			return setGlobalDefaults(inClusterConfig), nil
+		}
+	}
+
+	// star (default) match
+	if authConfig, ok := c.kubeconfig.AuthInfos["*"]; ok {
+		return restConfigFromKubeconfig(authConfig)
+	}
+
+	// use the current context from the kubeconfig if possible
+	if len(c.kubeconfig.CurrentContext) > 0 {
+		if currContext, ok := c.kubeconfig.Contexts[c.kubeconfig.CurrentContext]; ok {
+			if len(currContext.AuthInfo) > 0 {
+				if currAuth, ok := c.kubeconfig.AuthInfos[currContext.AuthInfo]; ok {
+					return restConfigFromKubeconfig(currAuth)
+				}
+			}
+		}
+	}
+
+	// anonymous
+	return setGlobalDefaults(&rest.Config{}), nil
+}
+
+func restConfigFromKubeconfig(configAuthInfo *clientcmdapi.AuthInfo) (*rest.Config, error) {
+	config := &rest.Config{}
+
+	// blindly overwrite existing values based on precedence
+	if len(configAuthInfo.Token) > 0 {
+		config.BearerToken = configAuthInfo.Token
+		config.BearerTokenFile = configAuthInfo.TokenFile
+	} else if len(configAuthInfo.TokenFile) > 0 {
+		tokenBytes, err := ioutil.ReadFile(configAuthInfo.TokenFile)
+		if err != nil {
+			return nil, err
+		}
+		config.BearerToken = string(tokenBytes)
+		config.BearerTokenFile = configAuthInfo.TokenFile
+	}
+	if len(configAuthInfo.Impersonate) > 0 {
+		config.Impersonate = rest.ImpersonationConfig{
+			UserName: configAuthInfo.Impersonate,
+			Groups:   configAuthInfo.ImpersonateGroups,
+			Extra:    configAuthInfo.ImpersonateUserExtra,
+		}
+	}
+	if len(configAuthInfo.ClientCertificate) > 0 || len(configAuthInfo.ClientCertificateData) > 0 {
+		config.CertFile = configAuthInfo.ClientCertificate
+		config.CertData = configAuthInfo.ClientCertificateData
+		config.KeyFile = configAuthInfo.ClientKey
+		config.KeyData = configAuthInfo.ClientKeyData
+	}
+	if len(configAuthInfo.Username) > 0 || len(configAuthInfo.Password) > 0 {
+		config.Username = configAuthInfo.Username
+		config.Password = configAuthInfo.Password
+	}
+	if configAuthInfo.Exec != nil {
+		config.ExecProvider = configAuthInfo.Exec.DeepCopy()
+	}
+	if configAuthInfo.AuthProvider != nil {
+		return nil, fmt.Errorf("auth provider not supported")
+	}
+
+	return setGlobalDefaults(config), nil
+}
+
+func setGlobalDefaults(config *rest.Config) *rest.Config {
+	config.UserAgent = "kube-apiserver-admission"
+	config.Timeout = 30 * time.Second
+
+	return config
+}

vendor/k8s.io/apiserver/pkg/util/webhook/client.go

@@ -0,0 +1,224 @@
+/*
+Copyright 2017 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 webhook
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net"
+	"net/url"
+	"strconv"
+
+	"github.com/hashicorp/golang-lru"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/runtime/serializer"
+	utilerrors "k8s.io/apimachinery/pkg/util/errors"
+	"k8s.io/client-go/rest"
+)
+
+const (
+	defaultCacheSize = 200
+)
+
+// ClientConfig defines parameters required for creating a hook client.
+type ClientConfig struct {
+	Name     string
+	URL      string
+	CABundle []byte
+	Service  *ClientConfigService
+}
+
+// ClientConfigService defines service discovery parameters of the webhook.
+type ClientConfigService struct {
+	Name      string
+	Namespace string
+	Path      string
+	Port      int32
+}
+
+// ClientManager builds REST clients to talk to webhooks. It caches the clients
+// to avoid duplicate creation.
+type ClientManager struct {
+	authInfoResolver     AuthenticationInfoResolver
+	serviceResolver      ServiceResolver
+	negotiatedSerializer runtime.NegotiatedSerializer
+	cache                *lru.Cache
+}
+
+// NewClientManager creates a clientManager.
+func NewClientManager(gvs []schema.GroupVersion, addToSchemaFuncs ...func(s *runtime.Scheme) error) (ClientManager, error) {
+	cache, err := lru.New(defaultCacheSize)
+	if err != nil {
+		return ClientManager{}, err
+	}
+	hookScheme := runtime.NewScheme()
+	for _, addToSchemaFunc := range addToSchemaFuncs {
+		if err := addToSchemaFunc(hookScheme); err != nil {
+			return ClientManager{}, err
+		}
+	}
+	return ClientManager{
+		cache: cache,
+		negotiatedSerializer: serializer.NegotiatedSerializerWrapper(runtime.SerializerInfo{
+			Serializer: serializer.NewCodecFactory(hookScheme).LegacyCodec(gvs...),
+		}),
+	}, nil
+}
+
+// SetAuthenticationInfoResolverWrapper sets the
+// AuthenticationInfoResolverWrapper.
+func (cm *ClientManager) SetAuthenticationInfoResolverWrapper(wrapper AuthenticationInfoResolverWrapper) {
+	if wrapper != nil {
+		cm.authInfoResolver = wrapper(cm.authInfoResolver)
+	}
+}
+
+// SetAuthenticationInfoResolver sets the AuthenticationInfoResolver.
+func (cm *ClientManager) SetAuthenticationInfoResolver(resolver AuthenticationInfoResolver) {
+	cm.authInfoResolver = resolver
+}
+
+// SetServiceResolver sets the ServiceResolver.
+func (cm *ClientManager) SetServiceResolver(sr ServiceResolver) {
+	if sr != nil {
+		cm.serviceResolver = sr
+	}
+}
+
+// Validate checks if ClientManager is properly set up.
+func (cm *ClientManager) Validate() error {
+	var errs []error
+	if cm.negotiatedSerializer == nil {
+		errs = append(errs, fmt.Errorf("the clientManager requires a negotiatedSerializer"))
+	}
+	if cm.serviceResolver == nil {
+		errs = append(errs, fmt.Errorf("the clientManager requires a serviceResolver"))
+	}
+	if cm.authInfoResolver == nil {
+		errs = append(errs, fmt.Errorf("the clientManager requires an authInfoResolver"))
+	}
+	return utilerrors.NewAggregate(errs)
+}
+
+// HookClient get a RESTClient from the cache, or constructs one based on the
+// webhook configuration.
+func (cm *ClientManager) HookClient(cc ClientConfig) (*rest.RESTClient, error) {
+	ccWithNoName := cc
+	ccWithNoName.Name = ""
+	cacheKey, err := json.Marshal(ccWithNoName)
+	if err != nil {
+		return nil, err
+	}
+	if client, ok := cm.cache.Get(string(cacheKey)); ok {
+		return client.(*rest.RESTClient), nil
+	}
+
+	complete := func(cfg *rest.Config) (*rest.RESTClient, error) {
+		// Avoid client-side rate limiting talking to the webhook backend.
+		// Rate limiting should happen when deciding how many requests to serve.
+		cfg.QPS = -1
+
+		// Combine CAData from the config with any existing CA bundle provided
+		if len(cfg.TLSClientConfig.CAData) > 0 {
+			cfg.TLSClientConfig.CAData = append(cfg.TLSClientConfig.CAData, '\n')
+		}
+		cfg.TLSClientConfig.CAData = append(cfg.TLSClientConfig.CAData, cc.CABundle...)
+
+		// Use http/1.1 instead of http/2.
+		// This is a workaround for http/2-enabled clients not load-balancing concurrent requests to multiple backends.
+		// See http://issue.k8s.io/75791 for details.
+		cfg.NextProtos = []string{"http/1.1"}
+
+		cfg.ContentConfig.NegotiatedSerializer = cm.negotiatedSerializer
+		cfg.ContentConfig.ContentType = runtime.ContentTypeJSON
+		client, err := rest.UnversionedRESTClientFor(cfg)
+		if err == nil {
+			cm.cache.Add(string(cacheKey), client)
+		}
+		return client, err
+	}
+
+	if cc.Service != nil {
+		port := cc.Service.Port
+		if port == 0 {
+			// Default to port 443 if no service port is specified
+			port = 443
+		}
+
+		restConfig, err := cm.authInfoResolver.ClientConfigForService(cc.Service.Name, cc.Service.Namespace, int(port))
+		if err != nil {
+			return nil, err
+		}
+		cfg := rest.CopyConfig(restConfig)
+		serverName := cc.Service.Name + "." + cc.Service.Namespace + ".svc"
+
+		host := net.JoinHostPort(serverName, strconv.Itoa(int(port)))
+		cfg.Host = "https://" + host
+		cfg.APIPath = cc.Service.Path
+		// Set the server name if not already set
+		if len(cfg.TLSClientConfig.ServerName) == 0 {
+			cfg.TLSClientConfig.ServerName = serverName
+		}
+
+		delegateDialer := cfg.Dial
+		if delegateDialer == nil {
+			var d net.Dialer
+			delegateDialer = d.DialContext
+		}
+		cfg.Dial = func(ctx context.Context, network, addr string) (net.Conn, error) {
+			if addr == host {
+				u, err := cm.serviceResolver.ResolveEndpoint(cc.Service.Namespace, cc.Service.Name, port)
+				if err != nil {
+					return nil, err
+				}
+				addr = u.Host
+			}
+			return delegateDialer(ctx, network, addr)
+		}
+
+		return complete(cfg)
+	}
+
+	if cc.URL == "" {
+		return nil, &ErrCallingWebhook{WebhookName: cc.Name, Reason: errors.New("webhook configuration must have either service or URL")}
+	}
+
+	u, err := url.Parse(cc.URL)
+	if err != nil {
+		return nil, &ErrCallingWebhook{WebhookName: cc.Name, Reason: fmt.Errorf("Unparsable URL: %v", err)}
+	}
+
+	hostPort := u.Host
+	if len(u.Port()) == 0 {
+		// Default to port 443 if no port is specified
+		hostPort = net.JoinHostPort(hostPort, "443")
+	}
+
+	restConfig, err := cm.authInfoResolver.ClientConfigFor(hostPort)
+	if err != nil {
+		return nil, err
+	}
+
+	cfg := rest.CopyConfig(restConfig)
+	cfg.Host = u.Scheme + "://" + u.Host
+	cfg.APIPath = u.Path
+
+	return complete(cfg)
+}

vendor/k8s.io/apiserver/pkg/util/webhook/error.go

@@ -0,0 +1,47 @@
+/*
+Copyright 2017 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 webhook
+
+import (
+	"fmt"
+
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+)
+
+// ErrCallingWebhook is returned for transport-layer errors calling webhooks. It
+// represents a failure to talk to the webhook, not the webhook rejecting a
+// request.
+type ErrCallingWebhook struct {
+	WebhookName string
+	Reason      error
+}
+
+func (e *ErrCallingWebhook) Error() string {
+	if e.Reason != nil {
+		return fmt.Sprintf("failed calling webhook %q: %v", e.WebhookName, e.Reason)
+	}
+	return fmt.Sprintf("failed calling webhook %q; no further details available", e.WebhookName)
+}
+
+// ErrWebhookRejection represents a webhook properly rejecting a request.
+type ErrWebhookRejection struct {
+	Status *apierrors.StatusError
+}
+
+func (e *ErrWebhookRejection) Error() string {
+	return e.Status.Error()
+}

vendor/k8s.io/apiserver/pkg/util/webhook/gencerts.sh

@@ -0,0 +1,107 @@
+#!/usr/bin/env bash
+
+# Copyright 2017 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.
+
+set -e
+
+# gencerts.sh generates the certificates for the webhook tests.
+#
+# It is not expected to be run often (there is no go generate rule), and mainly
+# exists for documentation purposes.
+
+CN_BASE="webhook_tests"
+
+cat > server.conf << EOF
+[req]
+req_extensions = v3_req
+distinguished_name = req_distinguished_name
+[req_distinguished_name]
+[ v3_req ]
+basicConstraints = CA:FALSE
+keyUsage = nonRepudiation, digitalSignature, keyEncipherment
+extendedKeyUsage = clientAuth, serverAuth
+subjectAltName = @alt_names
+[alt_names]
+IP.1 = 127.0.0.1
+EOF
+
+cat > client.conf << EOF
+[req]
+req_extensions = v3_req
+distinguished_name = req_distinguished_name
+[req_distinguished_name]
+[ v3_req ]
+basicConstraints = CA:FALSE
+keyUsage = nonRepudiation, digitalSignature, keyEncipherment
+extendedKeyUsage = clientAuth, serverAuth
+subjectAltName = @alt_names
+[alt_names]
+IP.1 = 127.0.0.1
+EOF
+
+# Create a certificate authority
+openssl genrsa -out caKey.pem 2048
+openssl req -x509 -new -nodes -key caKey.pem -days 100000 -out caCert.pem -subj "/CN=${CN_BASE}_ca"
+
+# Create a second certificate authority
+openssl genrsa -out badCAKey.pem 2048
+openssl req -x509 -new -nodes -key badCAKey.pem -days 100000 -out badCACert.pem -subj "/CN=${CN_BASE}_ca"
+
+# Create a server certiticate
+openssl genrsa -out serverKey.pem 2048
+openssl req -new -key serverKey.pem -out server.csr -subj "/CN=${CN_BASE}_server" -config server.conf
+openssl x509 -req -in server.csr -CA caCert.pem -CAkey caKey.pem -CAcreateserial -out serverCert.pem -days 100000 -extensions v3_req -extfile server.conf
+
+# Create a client certiticate
+openssl genrsa -out clientKey.pem 2048
+openssl req -new -key clientKey.pem -out client.csr -subj "/CN=${CN_BASE}_client" -config client.conf
+openssl x509 -req -in client.csr -CA caCert.pem -CAkey caKey.pem -CAcreateserial -out clientCert.pem -days 100000 -extensions v3_req -extfile client.conf
+
+outfile=certs_test.go
+
+cat > $outfile << EOF
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// This file was generated using openssl by the gencerts.sh script
+// and holds raw certificates for the webhook tests.
+
+package webhook
+EOF
+
+for file in caKey caCert badCAKey badCACert serverKey serverCert clientKey clientCert; do
+	data=$(cat ${file}.pem)
+	echo "" >> $outfile
+	echo "var $file = []byte(\`$data\`)" >> $outfile
+done
+
+# Clean up after we're done.
+rm ./*.pem
+rm ./*.csr
+rm ./*.srl
+rm ./*.conf

vendor/k8s.io/apiserver/pkg/util/webhook/serviceresolver.go

@@ -0,0 +1,47 @@
+/*
+Copyright 2017 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 webhook
+
+import (
+	"errors"
+	"fmt"
+	"net/url"
+)
+
+// ServiceResolver knows how to convert a service reference into an actual location.
+type ServiceResolver interface {
+	ResolveEndpoint(namespace, name string, port int32) (*url.URL, error)
+}
+
+type defaultServiceResolver struct{}
+
+// NewDefaultServiceResolver creates a new default server resolver.
+func NewDefaultServiceResolver() ServiceResolver {
+	return &defaultServiceResolver{}
+}
+
+// ResolveEndpoint constructs a service URL from a given namespace and name
+// note that the name, namespace, and port are required and by default all
+// created addresses use HTTPS scheme.
+// for example:
+//  name=ross namespace=andromeda resolves to https://ross.andromeda.svc:443
+func (sr defaultServiceResolver) ResolveEndpoint(namespace, name string, port int32) (*url.URL, error) {
+	if len(name) == 0 || len(namespace) == 0 || port == 0 {
+		return nil, errors.New("cannot resolve an empty service name or namespace or port")
+	}
+	return &url.URL{Scheme: "https", Host: fmt.Sprintf("%s.%s.svc:%d", name, namespace, port)}, nil
+}

vendor/k8s.io/apiserver/pkg/util/webhook/validation.go

@@ -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 webhook
+
+import (
+	"fmt"
+	"net/url"
+	"strings"
+
+	"k8s.io/apimachinery/pkg/util/validation"
+	"k8s.io/apimachinery/pkg/util/validation/field"
+)
+
+// ValidateWebhookURL validates webhook's URL.
+func ValidateWebhookURL(fldPath *field.Path, URL string, forceHttps bool) field.ErrorList {
+	var allErrors field.ErrorList
+	const form = "; desired format: https://host[/path]"
+	if u, err := url.Parse(URL); err != nil {
+		allErrors = append(allErrors, field.Required(fldPath, "url must be a valid URL: "+err.Error()+form))
+	} else {
+		if forceHttps && u.Scheme != "https" {
+			allErrors = append(allErrors, field.Invalid(fldPath, u.Scheme, "'https' is the only allowed URL scheme"+form))
+		}
+		if len(u.Host) == 0 {
+			allErrors = append(allErrors, field.Invalid(fldPath, u.Host, "host must be provided"+form))
+		}
+		if u.User != nil {
+			allErrors = append(allErrors, field.Invalid(fldPath, u.User.String(), "user information is not permitted in the URL"))
+		}
+		if len(u.Fragment) != 0 {
+			allErrors = append(allErrors, field.Invalid(fldPath, u.Fragment, "fragments are not permitted in the URL"))
+		}
+		if len(u.RawQuery) != 0 {
+			allErrors = append(allErrors, field.Invalid(fldPath, u.RawQuery, "query parameters are not permitted in the URL"))
+		}
+	}
+	return allErrors
+}
+
+func ValidateWebhookService(fldPath *field.Path, namespace, name string, path *string, port int32) field.ErrorList {
+	var allErrors field.ErrorList
+
+	if len(name) == 0 {
+		allErrors = append(allErrors, field.Required(fldPath.Child("name"), "service name is required"))
+	}
+
+	if len(namespace) == 0 {
+		allErrors = append(allErrors, field.Required(fldPath.Child("namespace"), "service namespace is required"))
+	}
+
+	if errs := validation.IsValidPortNum(int(port)); errs != nil {
+		allErrors = append(allErrors, field.Invalid(fldPath.Child("port"), port, "port is not valid: "+strings.Join(errs, ", ")))
+	}
+
+	if path == nil {
+		return allErrors
+	}
+
+	// TODO: replace below with url.Parse + verifying that host is empty?
+
+	urlPath := *path
+	if urlPath == "/" || len(urlPath) == 0 {
+		return allErrors
+	}
+	if urlPath == "//" {
+		allErrors = append(allErrors, field.Invalid(fldPath.Child("path"), urlPath, "segment[0] may not be empty"))
+		return allErrors
+	}
+
+	if !strings.HasPrefix(urlPath, "/") {
+		allErrors = append(allErrors, field.Invalid(fldPath.Child("path"), urlPath, "must start with a '/'"))
+	}
+
+	urlPathToCheck := urlPath[1:]
+	if strings.HasSuffix(urlPathToCheck, "/") {
+		urlPathToCheck = urlPathToCheck[:len(urlPathToCheck)-1]
+	}
+	steps := strings.Split(urlPathToCheck, "/")
+	for i, step := range steps {
+		if len(step) == 0 {
+			allErrors = append(allErrors, field.Invalid(fldPath.Child("path"), urlPath, fmt.Sprintf("segment[%d] may not be empty", i)))
+			continue
+		}
+		failures := validation.IsDNS1123Subdomain(step)
+		for _, failure := range failures {
+			allErrors = append(allErrors, field.Invalid(fldPath.Child("path"), urlPath, fmt.Sprintf("segment[%d]: %v", i, failure)))
+		}
+	}
+
+	return allErrors
+}

vendor/k8s.io/apiserver/pkg/util/webhook/webhook.go

@@ -0,0 +1,148 @@
+/*
+Copyright 2016 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 webhook implements a generic HTTP webhook plugin.
+package webhook
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/runtime/serializer"
+	"k8s.io/apimachinery/pkg/util/net"
+	"k8s.io/apimachinery/pkg/util/wait"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+)
+
+// defaultRequestTimeout is set for all webhook request. This is the absolute
+// timeout of the HTTP request, including reading the response body.
+const defaultRequestTimeout = 30 * time.Second
+
+// GenericWebhook defines a generic client for webhooks with commonly used capabilities,
+// such as retry requests.
+type GenericWebhook struct {
+	RestClient     *rest.RESTClient
+	InitialBackoff time.Duration
+	ShouldRetry    func(error) bool
+}
+
+// DefaultShouldRetry is a default implementation for the GenericWebhook ShouldRetry function property.
+// If the error reason is one of: networking (connection reset) or http (InternalServerError (500), GatewayTimeout (504), TooManyRequests (429)),
+// or apierrors.SuggestsClientDelay() returns true, then the function advises a retry.
+// Otherwise it returns false for an immediate fail.
+func DefaultShouldRetry(err error) bool {
+	// these errors indicate a transient error that should be retried.
+	if net.IsConnectionReset(err) || apierrors.IsInternalError(err) || apierrors.IsTimeout(err) || apierrors.IsTooManyRequests(err) {
+		return true
+	}
+	// if the error sends the Retry-After header, we respect it as an explicit confirmation we should retry.
+	if _, shouldRetry := apierrors.SuggestsClientDelay(err); shouldRetry {
+		return true
+	}
+	return false
+}
+
+// NewGenericWebhook creates a new GenericWebhook from the provided kubeconfig file.
+func NewGenericWebhook(scheme *runtime.Scheme, codecFactory serializer.CodecFactory, kubeConfigFile string, groupVersions []schema.GroupVersion, initialBackoff time.Duration) (*GenericWebhook, error) {
+	return newGenericWebhook(scheme, codecFactory, kubeConfigFile, groupVersions, initialBackoff, defaultRequestTimeout)
+}
+
+func newGenericWebhook(scheme *runtime.Scheme, codecFactory serializer.CodecFactory, kubeConfigFile string, groupVersions []schema.GroupVersion, initialBackoff, requestTimeout time.Duration) (*GenericWebhook, error) {
+	for _, groupVersion := range groupVersions {
+		if !scheme.IsVersionRegistered(groupVersion) {
+			return nil, fmt.Errorf("webhook plugin requires enabling extension resource: %s", groupVersion)
+		}
+	}
+
+	loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
+	loadingRules.ExplicitPath = kubeConfigFile
+	loader := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, &clientcmd.ConfigOverrides{})
+
+	clientConfig, err := loader.ClientConfig()
+	if err != nil {
+		return nil, err
+	}
+
+	// Kubeconfigs can't set a timeout, this can only be set through a command line flag.
+	//
+	// https://github.com/kubernetes/client-go/blob/master/tools/clientcmd/overrides.go
+	//
+	// Set this to something reasonable so request to webhooks don't hang forever.
+	clientConfig.Timeout = requestTimeout
+
+	// Avoid client-side rate limiting talking to the webhook backend.
+	// Rate limiting should happen when deciding how many requests to serve.
+	clientConfig.QPS = -1
+
+	codec := codecFactory.LegacyCodec(groupVersions...)
+	clientConfig.ContentConfig.NegotiatedSerializer = serializer.NegotiatedSerializerWrapper(runtime.SerializerInfo{Serializer: codec})
+
+	restClient, err := rest.UnversionedRESTClientFor(clientConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	return &GenericWebhook{restClient, initialBackoff, DefaultShouldRetry}, nil
+}
+
+// WithExponentialBackoff will retry webhookFn() up to 5 times with exponentially increasing backoff when
+// it returns an error for which this GenericWebhook's ShouldRetry function returns true, confirming it to
+// be retriable. If no ShouldRetry has been defined for the webhook, then the default one is used (DefaultShouldRetry).
+func (g *GenericWebhook) WithExponentialBackoff(ctx context.Context, webhookFn func() rest.Result) rest.Result {
+	var result rest.Result
+	shouldRetry := g.ShouldRetry
+	if shouldRetry == nil {
+		shouldRetry = DefaultShouldRetry
+	}
+	WithExponentialBackoff(ctx, g.InitialBackoff, func() error {
+		result = webhookFn()
+		return result.Error()
+	}, shouldRetry)
+	return result
+}
+
+// WithExponentialBackoff will retry webhookFn up to 5 times with exponentially increasing backoff when
+// it returns an error for which shouldRetry returns true, confirming it to be retriable.
+func WithExponentialBackoff(ctx context.Context, initialBackoff time.Duration, webhookFn func() error, shouldRetry func(error) bool) error {
+	backoff := wait.Backoff{
+		Duration: initialBackoff,
+		Factor:   1.5,
+		Jitter:   0.2,
+		Steps:    5,
+	}
+
+	var err error
+	wait.ExponentialBackoff(backoff, func() (bool, error) {
+		err = webhookFn()
+		if ctx.Err() != nil {
+			// we timed out or were cancelled, we should not retry
+			return true, err
+		}
+		if shouldRetry(err) {
+			return false, nil
+		}
+		if err != nil {
+			return false, err
+		}
+		return true, nil
+	})
+	return err
+}

vendor/k8s.io/apiserver/plugin/pkg/authenticator/token/webhook/webhook.go

@@ -0,0 +1,250 @@
+/*
+Copyright 2016 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 webhook implements the authenticator.Token interface using HTTP webhooks.
+package webhook
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"time"
+
+	authenticationv1 "k8s.io/api/authentication/v1"
+	authenticationv1beta1 "k8s.io/api/authentication/v1beta1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apiserver/pkg/authentication/authenticator"
+	"k8s.io/apiserver/pkg/authentication/user"
+	"k8s.io/apiserver/pkg/util/webhook"
+	"k8s.io/client-go/kubernetes/scheme"
+	authenticationv1client "k8s.io/client-go/kubernetes/typed/authentication/v1"
+	"k8s.io/klog"
+)
+
+const retryBackoff = 500 * time.Millisecond
+
+// Ensure WebhookTokenAuthenticator implements the authenticator.Token interface.
+var _ authenticator.Token = (*WebhookTokenAuthenticator)(nil)
+
+type tokenReviewer interface {
+	CreateContext(ctx context.Context, review *authenticationv1.TokenReview) (*authenticationv1.TokenReview, error)
+}
+
+type WebhookTokenAuthenticator struct {
+	tokenReview    tokenReviewer
+	initialBackoff time.Duration
+	implicitAuds   authenticator.Audiences
+}
+
+// NewFromInterface creates a webhook authenticator using the given tokenReview
+// client. It is recommend to wrap this authenticator with the token cache
+// authenticator implemented in
+// k8s.io/apiserver/pkg/authentication/token/cache.
+func NewFromInterface(tokenReview authenticationv1client.TokenReviewInterface, implicitAuds authenticator.Audiences) (*WebhookTokenAuthenticator, error) {
+	return newWithBackoff(tokenReview, retryBackoff, implicitAuds)
+}
+
+// New creates a new WebhookTokenAuthenticator from the provided kubeconfig
+// file. It is recommend to wrap this authenticator with the token cache
+// authenticator implemented in
+// k8s.io/apiserver/pkg/authentication/token/cache.
+func New(kubeConfigFile string, version string, implicitAuds authenticator.Audiences) (*WebhookTokenAuthenticator, error) {
+	tokenReview, err := tokenReviewInterfaceFromKubeconfig(kubeConfigFile, version)
+	if err != nil {
+		return nil, err
+	}
+	return newWithBackoff(tokenReview, retryBackoff, implicitAuds)
+}
+
+// newWithBackoff allows tests to skip the sleep.
+func newWithBackoff(tokenReview tokenReviewer, initialBackoff time.Duration, implicitAuds authenticator.Audiences) (*WebhookTokenAuthenticator, error) {
+	return &WebhookTokenAuthenticator{tokenReview, initialBackoff, implicitAuds}, nil
+}
+
+// AuthenticateToken implements the authenticator.Token interface.
+func (w *WebhookTokenAuthenticator) AuthenticateToken(ctx context.Context, token string) (*authenticator.Response, bool, error) {
+	// We take implicit audiences of the API server at WebhookTokenAuthenticator
+	// construction time. The outline of how we validate audience here is:
+	//
+	// * if the ctx is not audience limited, don't do any audience validation.
+	// * if ctx is audience-limited, add the audiences to the tokenreview spec
+	//   * if the tokenreview returns with audiences in the status that intersect
+	//     with the audiences in the ctx, copy into the response and return success
+	//   * if the tokenreview returns without an audience in the status, ensure
+	//     the ctx audiences intersect with the implicit audiences, and set the
+	//     intersection in the response.
+	//   * otherwise return unauthenticated.
+	wantAuds, checkAuds := authenticator.AudiencesFrom(ctx)
+	r := &authenticationv1.TokenReview{
+		Spec: authenticationv1.TokenReviewSpec{
+			Token:     token,
+			Audiences: wantAuds,
+		},
+	}
+	var (
+		result *authenticationv1.TokenReview
+		err    error
+		auds   authenticator.Audiences
+	)
+	webhook.WithExponentialBackoff(ctx, w.initialBackoff, func() error {
+		result, err = w.tokenReview.CreateContext(ctx, r)
+		return err
+	}, webhook.DefaultShouldRetry)
+	if err != nil {
+		// An error here indicates bad configuration or an outage. Log for debugging.
+		klog.Errorf("Failed to make webhook authenticator request: %v", err)
+		return nil, false, err
+	}
+
+	if checkAuds {
+		gotAuds := w.implicitAuds
+		if len(result.Status.Audiences) > 0 {
+			gotAuds = result.Status.Audiences
+		}
+		auds = wantAuds.Intersect(gotAuds)
+		if len(auds) == 0 {
+			return nil, false, nil
+		}
+	}
+
+	r.Status = result.Status
+	if !r.Status.Authenticated {
+		var err error
+		if len(r.Status.Error) != 0 {
+			err = errors.New(r.Status.Error)
+		}
+		return nil, false, err
+	}
+
+	var extra map[string][]string
+	if r.Status.User.Extra != nil {
+		extra = map[string][]string{}
+		for k, v := range r.Status.User.Extra {
+			extra[k] = v
+		}
+	}
+
+	return &authenticator.Response{
+		User: &user.DefaultInfo{
+			Name:   r.Status.User.Username,
+			UID:    r.Status.User.UID,
+			Groups: r.Status.User.Groups,
+			Extra:  extra,
+		},
+		Audiences: auds,
+	}, true, nil
+}
+
+// tokenReviewInterfaceFromKubeconfig builds a client from the specified kubeconfig file,
+// and returns a TokenReviewInterface that uses that client. Note that the client submits TokenReview
+// requests to the exact path specified in the kubeconfig file, so arbitrary non-API servers can be targeted.
+func tokenReviewInterfaceFromKubeconfig(kubeConfigFile string, version string) (tokenReviewer, error) {
+	localScheme := runtime.NewScheme()
+	if err := scheme.AddToScheme(localScheme); err != nil {
+		return nil, err
+	}
+
+	switch version {
+	case authenticationv1.SchemeGroupVersion.Version:
+		groupVersions := []schema.GroupVersion{authenticationv1.SchemeGroupVersion}
+		if err := localScheme.SetVersionPriority(groupVersions...); err != nil {
+			return nil, err
+		}
+		gw, err := webhook.NewGenericWebhook(localScheme, scheme.Codecs, kubeConfigFile, groupVersions, 0)
+		if err != nil {
+			return nil, err
+		}
+		return &tokenReviewV1Client{gw}, nil
+
+	case authenticationv1beta1.SchemeGroupVersion.Version:
+		groupVersions := []schema.GroupVersion{authenticationv1beta1.SchemeGroupVersion}
+		if err := localScheme.SetVersionPriority(groupVersions...); err != nil {
+			return nil, err
+		}
+		gw, err := webhook.NewGenericWebhook(localScheme, scheme.Codecs, kubeConfigFile, groupVersions, 0)
+		if err != nil {
+			return nil, err
+		}
+		return &tokenReviewV1beta1Client{gw}, nil
+
+	default:
+		return nil, fmt.Errorf(
+			"unsupported authentication webhook version %q, supported versions are %q, %q",
+			version,
+			authenticationv1.SchemeGroupVersion.Version,
+			authenticationv1beta1.SchemeGroupVersion.Version,
+		)
+	}
+
+}
+
+type tokenReviewV1Client struct {
+	w *webhook.GenericWebhook
+}
+
+func (t *tokenReviewV1Client) CreateContext(ctx context.Context, review *authenticationv1.TokenReview) (*authenticationv1.TokenReview, error) {
+	result := &authenticationv1.TokenReview{}
+	err := t.w.RestClient.Post().Context(ctx).Body(review).Do().Into(result)
+	return result, err
+}
+
+type tokenReviewV1beta1Client struct {
+	w *webhook.GenericWebhook
+}
+
+func (t *tokenReviewV1beta1Client) CreateContext(ctx context.Context, review *authenticationv1.TokenReview) (*authenticationv1.TokenReview, error) {
+	v1beta1Review := &authenticationv1beta1.TokenReview{Spec: v1SpecToV1beta1Spec(&review.Spec)}
+	v1beta1Result := &authenticationv1beta1.TokenReview{}
+	err := t.w.RestClient.Post().Context(ctx).Body(v1beta1Review).Do().Into(v1beta1Result)
+	if err != nil {
+		return nil, err
+	}
+	review.Status = v1beta1StatusToV1Status(&v1beta1Result.Status)
+	return review, nil
+}
+
+func v1SpecToV1beta1Spec(in *authenticationv1.TokenReviewSpec) authenticationv1beta1.TokenReviewSpec {
+	return authenticationv1beta1.TokenReviewSpec{
+		Token:     in.Token,
+		Audiences: in.Audiences,
+	}
+}
+
+func v1beta1StatusToV1Status(in *authenticationv1beta1.TokenReviewStatus) authenticationv1.TokenReviewStatus {
+	return authenticationv1.TokenReviewStatus{
+		Authenticated: in.Authenticated,
+		User:          v1beta1UserToV1User(in.User),
+		Audiences:     in.Audiences,
+		Error:         in.Error,
+	}
+}
+
+func v1beta1UserToV1User(u authenticationv1beta1.UserInfo) authenticationv1.UserInfo {
+	var extra map[string]authenticationv1.ExtraValue
+	if u.Extra != nil {
+		extra = make(map[string]authenticationv1.ExtraValue, len(u.Extra))
+		for k, v := range u.Extra {
+			extra[k] = authenticationv1.ExtraValue(v)
+		}
+	}
+	return authenticationv1.UserInfo{
+		Username: u.Username,
+		UID:      u.UID,
+		Groups:   u.Groups,
+		Extra:    extra,
+	}
+}