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update.go
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update.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 handlers
import (
"context"
"fmt"
"net/http"
"sync"
"time"
"k8s.io/apimachinery/pkg/api/errors"
metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/validation"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apiserver/pkg/admission"
"k8s.io/apiserver/pkg/audit"
"k8s.io/apiserver/pkg/authorization/authorizer"
"k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
"k8s.io/apiserver/pkg/endpoints/request"
"k8s.io/apiserver/pkg/features"
"k8s.io/apiserver/pkg/registry/rest"
"k8s.io/apiserver/pkg/util/dryrun"
utilfeature "k8s.io/apiserver/pkg/util/feature"
utiltrace "k8s.io/apiserver/pkg/util/trace"
)
// UpdateResource returns a function that will handle a resource update
func UpdateResource(r rest.Updater, scope RequestScope, admit admission.Interface) http.HandlerFunc {
return func(w http.ResponseWriter, req *http.Request) {
// For performance tracking purposes.
trace := utiltrace.New("Update " + req.URL.Path)
defer trace.LogIfLong(500 * time.Millisecond)
if isDryRun(req.URL) && !utilfeature.DefaultFeatureGate.Enabled(features.DryRun) {
scope.err(errors.NewBadRequest("the dryRun alpha feature is disabled"), w, req)
return
}
// TODO: we either want to remove timeout or document it (if we document, move timeout out of this function and declare it in api_installer)
timeout := parseTimeout(req.URL.Query().Get("timeout"))
namespace, name, err := scope.Namer.Name(req)
if err != nil {
scope.err(err, w, req)
return
}
ctx := req.Context()
ctx = request.WithNamespace(ctx, namespace)
body, err := readBody(req)
if err != nil {
scope.err(err, w, req)
return
}
options := &metav1.UpdateOptions{}
if err := metainternalversion.ParameterCodec.DecodeParameters(req.URL.Query(), scope.MetaGroupVersion, options); err != nil {
err = errors.NewBadRequest(err.Error())
scope.err(err, w, req)
return
}
if errs := validation.ValidateUpdateOptions(options); len(errs) > 0 {
err := errors.NewInvalid(schema.GroupKind{Group: metav1.GroupName, Kind: "UpdateOptions"}, "", errs)
scope.err(err, w, req)
return
}
s, err := negotiation.NegotiateInputSerializer(req, false, scope.Serializer)
if err != nil {
scope.err(err, w, req)
return
}
defaultGVK := scope.Kind
original := r.New()
trace.Step("About to convert to expected version")
decoder := scope.Serializer.DecoderToVersion(s.Serializer, schema.GroupVersion{Group: defaultGVK.Group, Version: runtime.APIVersionInternal})
obj, gvk, err := decoder.Decode(body, &defaultGVK, original)
if err != nil {
err = transformDecodeError(scope.Typer, err, original, gvk, body)
scope.err(err, w, req)
return
}
if gvk.GroupVersion() != defaultGVK.GroupVersion() {
err = errors.NewBadRequest(fmt.Sprintf("the API version in the data (%s) does not match the expected API version (%s)", gvk.GroupVersion(), defaultGVK.GroupVersion()))
scope.err(err, w, req)
return
}
trace.Step("Conversion done")
ae := request.AuditEventFrom(ctx)
audit.LogRequestObject(ae, obj, scope.Resource, scope.Subresource, scope.Serializer)
admit = admission.WithAudit(admit, ae)
if err := checkName(obj, name, namespace, scope.Namer); err != nil {
scope.err(err, w, req)
return
}
userInfo, _ := request.UserFrom(ctx)
var transformers []rest.TransformFunc
if mutatingAdmission, ok := admit.(admission.MutationInterface); ok {
transformers = append(transformers, func(ctx context.Context, newObj, oldObj runtime.Object) (runtime.Object, error) {
isNotZeroObject, err := hasUID(oldObj)
if err != nil {
return nil, fmt.Errorf("unexpected error when extracting UID from oldObj: %v", err.Error())
} else if !isNotZeroObject {
if mutatingAdmission.Handles(admission.Create) {
return newObj, mutatingAdmission.Admit(admission.NewAttributesRecord(newObj, nil, scope.Kind, namespace, name, scope.Resource, scope.Subresource, admission.Create, dryrun.IsDryRun(options.DryRun), userInfo))
}
} else {
if mutatingAdmission.Handles(admission.Update) {
return newObj, mutatingAdmission.Admit(admission.NewAttributesRecord(newObj, oldObj, scope.Kind, namespace, name, scope.Resource, scope.Subresource, admission.Update, dryrun.IsDryRun(options.DryRun), userInfo))
}
}
return newObj, nil
})
}
createAuthorizerAttributes := authorizer.AttributesRecord{
User: userInfo,
ResourceRequest: true,
Path: req.URL.Path,
Verb: "create",
APIGroup: scope.Resource.Group,
APIVersion: scope.Resource.Version,
Resource: scope.Resource.Resource,
Subresource: scope.Subresource,
Namespace: namespace,
Name: name,
}
trace.Step("About to store object in database")
wasCreated := false
result, err := finishRequest(timeout, func() (runtime.Object, error) {
obj, created, err := r.Update(
ctx,
name,
rest.DefaultUpdatedObjectInfo(obj, transformers...),
withAuthorization(rest.AdmissionToValidateObjectFunc(
admit,
admission.NewAttributesRecord(nil, nil, scope.Kind, namespace, name, scope.Resource, scope.Subresource, admission.Create, dryrun.IsDryRun(options.DryRun), userInfo)),
scope.Authorizer, createAuthorizerAttributes),
rest.AdmissionToValidateObjectUpdateFunc(
admit,
admission.NewAttributesRecord(nil, nil, scope.Kind, namespace, name, scope.Resource, scope.Subresource, admission.Update, dryrun.IsDryRun(options.DryRun), userInfo)),
false,
options,
)
wasCreated = created
return obj, err
})
if err != nil {
scope.err(err, w, req)
return
}
trace.Step("Object stored in database")
requestInfo, ok := request.RequestInfoFrom(ctx)
if !ok {
scope.err(fmt.Errorf("missing requestInfo"), w, req)
return
}
if err := setSelfLink(result, requestInfo, scope.Namer); err != nil {
scope.err(err, w, req)
return
}
trace.Step("Self-link added")
status := http.StatusOK
if wasCreated {
status = http.StatusCreated
}
transformResponseObject(ctx, scope, req, w, status, result)
}
}
func withAuthorization(validate rest.ValidateObjectFunc, a authorizer.Authorizer, attributes authorizer.Attributes) rest.ValidateObjectFunc {
var once sync.Once
var authorizerDecision authorizer.Decision
var authorizerReason string
var authorizerErr error
return func(obj runtime.Object) error {
if a == nil {
return errors.NewInternalError(fmt.Errorf("no authorizer provided, unable to authorize a create on update"))
}
once.Do(func() {
authorizerDecision, authorizerReason, authorizerErr = a.Authorize(attributes)
})
// an authorizer like RBAC could encounter evaluation errors and still allow the request, so authorizer decision is checked before error here.
if authorizerDecision == authorizer.DecisionAllow {
// Continue to validating admission
return validate(obj)
}
if authorizerErr != nil {
return errors.NewInternalError(authorizerErr)
}
// The user is not authorized to perform this action, so we need to build the error response
gr := schema.GroupResource{
Group: attributes.GetAPIGroup(),
Resource: attributes.GetResource(),
}
name := attributes.GetName()
err := fmt.Errorf("%v", authorizerReason)
return errors.NewForbidden(gr, name, err)
}
}