/
proxy.go
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/
proxy.go
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/*
Copyright 2021 KubeCube 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 resourcemanage
import (
"bytes"
"context"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/http/httputil"
"strings"
"github.com/gin-gonic/gin"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
clusterv1 "github.com/kubecube-io/kubecube/pkg/apis/cluster/v1"
"github.com/kubecube-io/kubecube/pkg/clients"
"github.com/kubecube-io/kubecube/pkg/clog"
"github.com/kubecube-io/kubecube/pkg/conversion"
"github.com/kubecube-io/kubecube/pkg/multicluster"
"github.com/kubecube-io/kubecube/pkg/utils/constants"
"github.com/kubecube-io/kubecube/pkg/utils/ctls"
"github.com/kubecube-io/kubecube/pkg/utils/errcode"
"github.com/kubecube-io/kubecube/pkg/utils/filter"
"github.com/kubecube-io/kubecube/pkg/utils/kubeconfig"
"github.com/kubecube-io/kubecube/pkg/utils/page"
"github.com/kubecube-io/kubecube/pkg/utils/response"
"github.com/kubecube-io/kubecube/pkg/utils/selector"
"github.com/kubecube-io/kubecube/pkg/utils/sort"
)
type ProxyHandler struct {
// enableConvert means proxy handler will convert resources
enableConvert bool
// converter the version converter for doing resources convert
converter conversion.MultiVersionConverter
}
func NewProxyHandler(enableConvert bool) *ProxyHandler {
return &ProxyHandler{
enableConvert: enableConvert,
converter: multicluster.NewDefaultMultiVersionConverter(multicluster.Interface()),
}
}
// tryVersionConvert try to convert url and request body by given target cluster
func (h *ProxyHandler) tryVersionConvert(cluster, url string, req *http.Request) (bool, []byte, string, error) {
if !h.enableConvert {
return false, nil, "", nil
}
_, isNamespaced, gvr, err := conversion.ParseURL(url)
if err != nil {
return false, nil, "", err
}
converter, err := h.converter.GetVersionConvert(cluster)
if err != nil {
return false, nil, "", err
}
greetBack, _, recommendVersion, err := converter.GvrGreeting(gvr)
if err != nil {
// we just record error and pass through anyway
clog.Warn(err.Error())
}
if greetBack != conversion.IsNeedConvert {
// pass through anyway if not need convert
clog.Info("%v greet cluster %v is %v, pass through", gvr.String(), cluster, greetBack)
return false, nil, "", nil
}
if recommendVersion == nil {
return false, nil, "", nil
}
// convert url according to specified gvr at first
convertedUrl, err := conversion.ConvertURL(url, &schema.GroupVersionResource{Group: recommendVersion.Group, Version: recommendVersion.Version, Resource: gvr.Resource})
if err != nil {
return false, nil, "", err
}
// we do not need convert body if request not create and update
if req.Method != http.MethodPost && req.Method != http.MethodPut {
return true, nil, convertedUrl, nil
}
data, err := ioutil.ReadAll(req.Body)
if err != nil {
return false, nil, "", err
}
// decode data into internal version of object
raw, rawGvr, err := converter.Decode(data, nil, nil)
if err != nil {
return false, nil, "", err
}
if rawGvr.GroupVersion().String() != gvr.GroupVersion().String() {
return false, nil, "", fmt.Errorf("gv parse failed with pair(%v~%v)", rawGvr.GroupVersion().String(), gvr.GroupVersion().String())
}
// covert internal version object int recommend version object
out, err := converter.Convert(raw, nil, recommendVersion.GroupVersion())
if err != nil {
return false, nil, "", err
}
// encode concerted object
convertedObj, err := converter.Encode(out, recommendVersion.GroupVersion())
if err != nil {
return false, nil, "", err
}
objMeta, err := meta.Accessor(out)
if err != nil {
return false, nil, "", err
}
if isNamespaced {
clog.Info("resource (%v/%v) converted with (%v~%v) when visit cluster %v", objMeta.GetNamespace(), objMeta.GetName(), gvr.String(), recommendVersion.GroupVersion().WithResource(gvr.Resource), cluster)
} else {
clog.Info("resource (%v) converted with (%v~%v) when visit cluster %v", objMeta.GetName(), gvr.String(), recommendVersion.GroupVersion().WithResource(gvr.Resource), cluster)
}
return true, convertedObj, convertedUrl, nil
}
// ProxyHandle proxy all requests access to k8s, request uri format like below
// api/v1/cube/proxy/clusters/{cluster}/{k8s_url}
func (h *ProxyHandler) ProxyHandle(c *gin.Context) {
// http request params
cluster := c.Param("cluster")
url := c.Param("url")
filter := parseQueryParams(c)
c.Request.Header.Set(constants.ImpersonateUserKey, "admin")
// get cluster info by cluster name
host, certData, keyData, caData := getClusterInfo(cluster)
if host == "" {
response.FailReturn(c, errcode.ClusterNotFoundError(cluster))
return
}
ts, err := ctls.MakeMTlsTransportByPem(caData, certData, keyData)
if err != nil {
clog.Error(err.Error())
response.FailReturn(c, errcode.InternalServerError)
return
}
_, _, gvr, err := conversion.ParseURL(url)
if err != nil {
clog.Error(err.Error())
response.FailReturn(c, errcode.InternalServerError)
return
}
needConvert, convertedObj, convertedUrl, err := h.tryVersionConvert(cluster, url, c.Request)
if err != nil {
clog.Error(err.Error())
response.FailReturn(c, errcode.InternalServerError)
return
}
// create director
director := func(req *http.Request) {
req.URL.Scheme = "https"
req.URL.Host = host
req.Host = host
req.URL.Path = url
if needConvert {
// replace request body and url if need
if convertedObj != nil {
r := bytes.NewReader(convertedObj)
body := io.NopCloser(r)
req.Body = body
req.ContentLength = int64(r.Len())
}
req.URL.Path = convertedUrl
}
}
errorHandler := func(resp http.ResponseWriter, req *http.Request, err error) {
if err != nil {
clog.Warn("cluster %s url %s proxy fail, %v", cluster, url, err)
response.FailReturn(c, errcode.ServerErr)
return
}
}
if needConvert {
// open response filter convert
_, _, convertedGvr, err := conversion.ParseURL(convertedUrl)
if err != nil {
clog.Error(err.Error())
response.FailReturn(c, errcode.InternalServerError)
return
}
filter.ConvertedGvr = convertedGvr
filter.EnableConvert = true
filter.Converter, _ = h.converter.GetVersionConvert(cluster)
filter.RawGvr = gvr
}
requestProxy := &httputil.ReverseProxy{Director: director, Transport: ts, ModifyResponse: filter.ModifyResponse, ErrorHandler: errorHandler}
// trim auth token here
c.Request.Header.Del(constants.AuthorizationHeader)
requestProxy.ServeHTTP(c.Writer, c.Request)
}
// get cluster info by clusterName
func getClusterInfo(clusterName string) (string, []byte, []byte, []byte) {
client := clients.Interface().Kubernetes(constants.LocalCluster)
if client == nil {
return "", nil, nil, nil
}
clusterInfo := clusterv1.Cluster{}
err := client.Cache().Get(context.Background(), types.NamespacedName{Name: clusterName}, &clusterInfo)
if err != nil {
clog.Info("the cluster %s is no exist: %v", clusterName, err)
return "", nil, nil, nil
}
host := clusterInfo.Spec.KubernetesAPIEndpoint
host = strings.TrimPrefix(host, "https://")
host = strings.TrimPrefix(host, "http://")
config, err := kubeconfig.LoadKubeConfigFromBytes(clusterInfo.Spec.KubeConfig)
if err != nil {
clog.Info("the cluster %s parser kubeconfig fail: %v", clusterName, err)
return "", nil, nil, nil
}
return host, config.CertData, config.KeyData, config.CAData
}
// product match/sort/page to other function
func Filter(c *gin.Context, result []byte) []byte {
resources := parseQueryParams(c)
return resources.FilterResult(result)
}
// product match/sort/page to other function
func FilterToMap(c *gin.Context, result []byte) filter.K8sJson {
resources := parseQueryParams(c)
return resources.FilterResultToMap(result)
}
// parse request params, include selector, sort and page
func parseQueryParams(c *gin.Context) filter.Filter {
exact, fuzzy := selector.ParseSelector(c.Query("selector"))
limit, offset := page.ParsePage(c.Query("pageSize"), c.Query("pageNum"))
sortName, sortOrder, sortFunc := sort.ParseSort(c.Query("sortName"), c.Query("sortOrder"), c.Query("sortFunc"))
filter := filter.Filter{
EnableFilter: needFilter(c),
Exact: exact,
Fuzzy: fuzzy,
Limit: limit,
Offset: offset,
SortName: sortName,
SortOrder: sortOrder,
SortFunc: sortFunc,
}
return filter
}
func needFilter(c *gin.Context) bool {
return c.Query("selector")+c.Query("pageSize")+c.Query("pageNum")+
c.Query("sortName")+c.Query("sortOrder")+c.Query("sortFunc") != ""
}