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inject_owner.go
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/
inject_owner.go
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// Copyright 2019 The Operator-SDK 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 proxy
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/http/httputil"
"strings"
"github.com/operator-framework/operator-sdk/pkg/ansible/proxy/controllermap"
"github.com/operator-framework/operator-sdk/pkg/ansible/proxy/kubeconfig"
k8sRequest "github.com/operator-framework/operator-sdk/pkg/ansible/proxy/requestfactory"
osdkHandler "github.com/operator-framework/operator-sdk/pkg/handler"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/sets"
)
// injectOwnerReferenceHandler will handle proxied requests and inject the
// owner reference found in the authorization header. The Authorization is
// then deleted so that the proxy can re-set with the correct authorization.
type injectOwnerReferenceHandler struct {
next http.Handler
cMap *controllermap.ControllerMap
restMapper meta.RESTMapper
watchedNamespaces map[string]interface{}
apiResources *apiResources
}
func (i *injectOwnerReferenceHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
switch req.Method {
case http.MethodPost:
dump, _ := httputil.DumpRequest(req, false)
log.V(2).Info("Dumping request", "RequestDump", string(dump))
rf := k8sRequest.RequestInfoFactory{APIPrefixes: sets.NewString("api", "apis"), GrouplessAPIPrefixes: sets.NewString("api")}
r, err := rf.NewRequestInfo(req)
if err != nil {
m := "Could not convert request"
log.Error(err, m)
http.Error(w, m, http.StatusBadRequest)
return
}
if r.Subresource != "" {
// Don't inject owner ref if we are POSTing to a subresource
break
}
if i.restMapper == nil {
i.restMapper = meta.NewDefaultRESTMapper([]schema.GroupVersion{schema.GroupVersion{
Group: r.APIGroup,
Version: r.APIVersion,
}})
}
k, err := getGVKFromRequestInfo(r, i.restMapper)
if err != nil {
// break here in case resource doesn't exist in cache
log.Info("Cache miss, can not find in rest mapper")
break
}
// Determine if the resource is virtual. If it is then we should not attempt to use cache
isVR, err := i.apiResources.IsVirtualResource(k)
if err != nil {
// break here in case we can not understand if virtual resource or not
log.Info("Unable to determine if virual resource", "gvk", k)
break
}
if isVR {
log.V(2).Info("Virtual resource, must ask the cluster API", "gvk", k)
break
}
log.Info("Injecting owner reference")
owner, err := getRequestOwnerRef(req)
if err != nil {
m := "Could not get owner reference"
log.Error(err, m)
http.Error(w, m, http.StatusInternalServerError)
return
}
body, err := ioutil.ReadAll(req.Body)
if err != nil {
m := "Could not read request body"
log.Error(err, m)
http.Error(w, m, http.StatusInternalServerError)
return
}
data := &unstructured.Unstructured{}
err = json.Unmarshal(body, data)
if err != nil {
m := "Could not deserialize request body"
log.Error(err, m)
http.Error(w, m, http.StatusBadRequest)
return
}
addOwnerRef, err := shouldAddOwnerRef(data, owner, i.restMapper)
if err != nil {
m := "Could not determine if we should add owner ref"
log.Error(err, m)
http.Error(w, m, http.StatusBadRequest)
return
}
if addOwnerRef {
data.SetOwnerReferences(append(data.GetOwnerReferences(), owner.OwnerReference))
} else {
ownerGV, err := schema.ParseGroupVersion(owner.APIVersion)
if err != nil {
m := fmt.Sprintf("could not get broup version for: %v", owner)
log.Error(err, m)
http.Error(w, m, http.StatusBadRequest)
return
}
a := data.GetAnnotations()
if a == nil {
a = map[string]string{}
}
a[osdkHandler.NamespacedNameAnnotation] = strings.Join([]string{owner.Namespace, owner.Name}, "/")
a[osdkHandler.TypeAnnotation] = fmt.Sprintf("%v.%v", owner.Kind, ownerGV.Group)
data.SetAnnotations(a)
}
newBody, err := json.Marshal(data.Object)
if err != nil {
m := "Could not serialize body"
log.Error(err, m)
http.Error(w, m, http.StatusInternalServerError)
return
}
log.V(2).Info("Serialized body", "Body", string(newBody))
req.Body = ioutil.NopCloser(bytes.NewBuffer(newBody))
req.ContentLength = int64(len(newBody))
// add watch for resource
// check if resource doesn't exist in watched namespaces
// if watchedNamespaces[""] exists then we are watching all namespaces
// and want to continue
// This is making sure we are not attempting to watch a resource outside of the
// namespaces that the cache can watch.
_, allNsPresent := i.watchedNamespaces[metav1.NamespaceAll]
_, reqNsPresent := i.watchedNamespaces[r.Namespace]
if allNsPresent || reqNsPresent {
err = addWatchToController(owner, i.cMap, data, i.restMapper, addOwnerRef)
if err != nil {
m := "could not add watch to controller"
log.Error(err, m)
http.Error(w, m, http.StatusInternalServerError)
return
}
}
}
i.next.ServeHTTP(w, req)
}
func shouldAddOwnerRef(data *unstructured.Unstructured, owner kubeconfig.NamespacedOwnerReference, restMapper meta.RESTMapper) (bool, error) {
dataMapping, err := restMapper.RESTMapping(data.GroupVersionKind().GroupKind(), data.GroupVersionKind().Version)
if err != nil {
m := fmt.Sprintf("Could not get rest mapping for: %v", data.GroupVersionKind())
log.Error(err, m)
return false, err
}
// We need to determine whether or not the owner is a cluster-scoped
// resource because enqueue based on an owner reference does not work if
// a namespaced resource owns a cluster-scoped resource
ownerGV, err := schema.ParseGroupVersion(owner.APIVersion)
if err != nil {
m := fmt.Sprintf("could not get group version for: %v", owner)
log.Error(err, m)
return false, err
}
ownerMapping, err := restMapper.RESTMapping(schema.GroupKind{Kind: owner.Kind, Group: ownerGV.Group}, ownerGV.Version)
if err != nil {
m := fmt.Sprintf("could not get rest mapping for: %v", owner)
log.Error(err, m)
return false, err
}
dataNamespaceScoped := dataMapping.Scope.Name() != meta.RESTScopeNameRoot
ownerNamespaceScoped := ownerMapping.Scope.Name() != meta.RESTScopeNameRoot
if dataNamespaceScoped && ownerNamespaceScoped && data.GetNamespace() == owner.Namespace {
return true, nil
}
return false, nil
}