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redirect.go
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redirect.go
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package filters
import (
"fmt"
"net/http"
"strings"
"github.com/loft-sh/vcluster/pkg/authorization/delegatingauthorizer"
"github.com/loft-sh/vcluster/pkg/server/handler"
requestpkg "github.com/loft-sh/vcluster/pkg/util/request"
"github.com/loft-sh/vcluster/pkg/util/translate"
corev1 "k8s.io/api/core/v1"
kerrors "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/apiserver/pkg/admission"
"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
"k8s.io/apiserver/pkg/endpoints/request"
"k8s.io/client-go/rest"
"k8s.io/klog"
"sigs.k8s.io/controller-runtime/pkg/client"
)
func WithRedirect(h http.Handler, localConfig *rest.Config, localScheme *runtime.Scheme, uncachedVirtualClient client.Client, admit admission.Interface, targetNamespace string, resources []delegatingauthorizer.GroupVersionResourceVerb) http.Handler {
s := serializer.NewCodecFactory(localScheme)
parameterCodec := runtime.NewParameterCodec(uncachedVirtualClient.Scheme())
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
info, ok := request.RequestInfoFrom(req.Context())
if !ok {
requestpkg.FailWithStatus(w, req, http.StatusInternalServerError, fmt.Errorf("request info is missing"))
return
}
if applies(info, resources) {
// call admission webhooks
err := callAdmissionWebhooks(req, info, parameterCodec, admit, uncachedVirtualClient)
if err != nil {
responsewriters.ErrorNegotiated(err, s, corev1.SchemeGroupVersion, w, req)
return
}
// we have to change the request url
if info.Resource != "nodes" {
if info.Namespace == "" {
responsewriters.ErrorNegotiated(kerrors.NewBadRequest("namespace required"), s, corev1.SchemeGroupVersion, w, req)
return
}
splitted := strings.Split(req.URL.Path, "/")
if len(splitted) < 6 {
responsewriters.ErrorNegotiated(kerrors.NewBadRequest("unexpected url"), s, corev1.SchemeGroupVersion, w, req)
return
}
// exchange namespace & name
splitted[4] = targetNamespace
// make sure we keep the prefix and suffix
targetName := translate.PhysicalName(splitted[6], info.Namespace)
splitted[6] = targetName
req.URL.Path = strings.Join(splitted, "/")
// we have to add a trailing slash here, because otherwise the
// host api server would redirect us to a wrong path
if len(splitted) == 8 {
req.URL.Path += "/"
}
}
h, err := handler.Handler("", localConfig, nil)
if err != nil {
requestpkg.FailWithStatus(w, req, http.StatusInternalServerError, err)
return
}
req.Header.Del("Authorization")
h.ServeHTTP(w, req)
return
}
h.ServeHTTP(w, req)
})
}
func callAdmissionWebhooks(req *http.Request, info *request.RequestInfo, parameterCodec runtime.ParameterCodec, admit admission.Interface, uncachedVirtualClient client.Client) error {
if info.Resource != "pods" {
return nil
} else if info.Subresource != "exec" && info.Subresource != "portforward" && info.Subresource != "attach" {
return nil
}
if admit != nil && admit.Handles(admission.Connect) {
userInfo, _ := request.UserFrom(req.Context())
if validatingAdmission, ok := admit.(admission.ValidationInterface); ok {
var opts runtime.Object
var kind schema.GroupVersionKind
if info.Subresource == "exec" {
kind = corev1.SchemeGroupVersion.WithKind("PodExecOptions")
opts = &corev1.PodExecOptions{}
if err := parameterCodec.DecodeParameters(req.URL.Query(), corev1.SchemeGroupVersion, opts); err != nil {
return err
}
} else if info.Subresource == "attach" {
kind = corev1.SchemeGroupVersion.WithKind("PodAttachOptions")
opts = &corev1.PodAttachOptions{}
if err := parameterCodec.DecodeParameters(req.URL.Query(), corev1.SchemeGroupVersion, opts); err != nil {
return err
}
} else if info.Subresource == "portforward" {
kind = corev1.SchemeGroupVersion.WithKind("PodPortForwardOptions")
opts = &corev1.PodPortForwardOptions{}
if err := parameterCodec.DecodeParameters(req.URL.Query(), corev1.SchemeGroupVersion, opts); err != nil {
return err
}
}
err := validatingAdmission.Validate(req.Context(), admission.NewAttributesRecord(opts, nil, kind, info.Namespace, info.Name, corev1.SchemeGroupVersion.WithResource(info.Resource), info.Subresource, admission.Connect, nil, false, userInfo), NewFakeObjectInterfaces(uncachedVirtualClient.Scheme(), uncachedVirtualClient.RESTMapper()))
if err != nil {
klog.Infof("Admission validate failed for %s: %v", info.Path, err)
return err
}
}
}
return nil
}
func applies(r *request.RequestInfo, resources []delegatingauthorizer.GroupVersionResourceVerb) bool {
if !r.IsResourceRequest {
return false
}
for _, gv := range resources {
if (gv.Group == "*" || gv.Group == r.APIGroup) && (gv.Version == "*" || gv.Version == r.APIVersion) && (gv.Resource == "*" || gv.Resource == r.Resource) && (gv.Verb == "*" || gv.Verb == r.Verb) && (gv.SubResource == "*" || gv.SubResource == r.Subresource) {
return true
}
}
return false
}