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proxy_server.go
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/
proxy_server.go
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package proxy
import (
"crypto/tls"
"crypto/x509"
"encoding/base64"
"net/http"
"net/url"
"strings"
"github.com/rancher/norman/httperror"
"github.com/rancher/types/apis/management.cattle.io/v3"
"github.com/rancher/types/config/dialer"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/proxy"
"k8s.io/client-go/rest"
)
type RemoteService struct {
cluster *v3.Cluster
transport http.RoundTripper
url *url.URL
auth string
}
var (
er = &errorResponder{}
)
type errorResponder struct {
}
func (e *errorResponder) Error(w http.ResponseWriter, req *http.Request, err error) {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
}
func prefix(cluster *v3.Cluster) string {
return "/k8s/clusters/" + cluster.Name
}
func New(localConfig *rest.Config, cluster *v3.Cluster, factory dialer.Factory) (*RemoteService, error) {
if cluster.Spec.Internal {
return NewLocal(localConfig, cluster)
}
return NewRemote(cluster, factory)
}
func NewLocal(localConfig *rest.Config, cluster *v3.Cluster) (*RemoteService, error) {
// the gvk is ignored by us, so just pass in any gvk
hostURL, _, err := rest.DefaultServerURL(localConfig.Host, localConfig.APIPath, schema.GroupVersion{}, true)
if err != nil {
return nil, err
}
transport, err := rest.TransportFor(localConfig)
if err != nil {
return nil, err
}
return &RemoteService{
cluster: cluster,
url: hostURL,
transport: transport,
}, nil
}
func NewRemote(cluster *v3.Cluster, factory dialer.Factory) (*RemoteService, error) {
if !v3.ClusterConditionProvisioned.IsTrue(cluster) {
return nil, httperror.NewAPIError(httperror.ClusterUnavailable, "cluster not provisioned")
}
transport := &http.Transport{}
if factory != nil {
d, err := factory.ClusterDialer(cluster.Name)
if err != nil {
return nil, err
}
transport.Dial = d
}
if cluster.Status.CACert != "" {
certBytes, err := base64.StdEncoding.DecodeString(cluster.Status.CACert)
if err != nil {
return nil, err
}
certs := x509.NewCertPool()
certs.AppendCertsFromPEM(certBytes)
transport.TLSClientConfig = &tls.Config{
RootCAs: certs,
}
}
u, err := url.Parse(cluster.Status.APIEndpoint)
if err != nil {
return nil, err
}
return &RemoteService{
cluster: cluster,
transport: transport,
url: u,
auth: "Bearer " + cluster.Status.ServiceAccountToken,
}, nil
}
func (r *RemoteService) Close() {
}
func (r *RemoteService) Handler() http.Handler {
return r
}
func (r *RemoteService) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
u := *r.url
u.Path = strings.TrimPrefix(req.URL.Path, prefix(r.cluster))
u.RawQuery = req.URL.RawQuery
proto := req.Header.Get("X-Forwarded-Proto")
if proto != "" {
req.URL.Scheme = proto
} else if req.TLS == nil {
req.URL.Scheme = "http"
} else {
req.URL.Scheme = "https"
}
req.URL.Host = req.Host
if r.auth != "" {
req.Header.Set("Authorization", r.auth)
}
httpProxy := proxy.NewUpgradeAwareHandler(&u, r.transport, true, false, er)
httpProxy.ServeHTTP(rw, req)
}
func (r *RemoteService) Cluster() *v3.Cluster {
return r.cluster
}
type SimpleProxy struct {
url *url.URL
transport http.RoundTripper
}
func NewSimpleProxy(host string, caData []byte) (*SimpleProxy, error) {
hostURL, _, err := rest.DefaultServerURL(host, "", schema.GroupVersion{}, true)
if err != nil {
return nil, err
}
ht := &http.Transport{}
if len(caData) > 0 {
certPool := x509.NewCertPool()
certPool.AppendCertsFromPEM(caData)
ht.TLSClientConfig = &tls.Config{
RootCAs: certPool,
}
}
return &SimpleProxy{
url: hostURL,
transport: ht,
}, nil
}
func (s *SimpleProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
u := *s.url
u.Path = req.URL.Path
u.RawQuery = req.URL.RawQuery
req.URL.Scheme = "https"
req.URL.Host = req.Host
httpProxy := proxy.NewUpgradeAwareHandler(&u, s.transport, true, false, er)
httpProxy.ServeHTTP(rw, req)
}