forked from openshift/oc
/
smart_merge.go
274 lines (230 loc) · 8.54 KB
/
smart_merge.go
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package kubeconfig
import (
"crypto/x509"
"fmt"
"net"
"net/url"
"reflect"
"strconv"
"strings"
x509request "k8s.io/apiserver/pkg/authentication/request/x509"
kerrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/third_party/forked/golang/netutil"
restclient "k8s.io/client-go/rest"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
userv1typedclient "github.com/openshift/client-go/user/clientset/versioned/typed/user/v1"
)
// getClusterNicknameFromConfig returns host:port of the clientConfig.Host, with .'s replaced by -'s
// TODO this is copied from pkg/client/config/smart_merge.go, looks like a good library-go candidate
func getClusterNicknameFromConfig(clientCfg *restclient.Config) (string, error) {
u, err := url.Parse(clientCfg.Host)
if err != nil {
return "", err
}
hostPort := netutil.CanonicalAddr(u)
// we need a character other than "." to avoid conflicts with. replace with '-'
return strings.Replace(hostPort, ".", "-", -1), nil
}
// getUserNicknameFromConfig returns "username(as known by the server)/getClusterNicknameFromConfig". This allows tab completion for switching users to
// work easily and obviously.
func getUserNicknameFromConfig(clientCfg *restclient.Config) (string, error) {
userPartOfNick, err := getUserPartOfNickname(clientCfg)
if err != nil {
return "", err
}
clusterNick, err := getClusterNicknameFromConfig(clientCfg)
if err != nil {
return "", err
}
return userPartOfNick + "/" + clusterNick, nil
}
func getUserPartOfNickname(clientCfg *restclient.Config) (string, error) {
userClient, err := userv1typedclient.NewForConfig(clientCfg)
if err != nil {
return "", err
}
userInfo, err := userClient.Users().Get("~", metav1.GetOptions{})
if kerrors.IsNotFound(err) || kerrors.IsForbidden(err) {
// if we're talking to kube (or likely talking to kube), take a best guess consistent with login
switch {
case len(clientCfg.BearerToken) > 0:
userInfo.Name = clientCfg.BearerToken
case len(clientCfg.Username) > 0:
userInfo.Name = clientCfg.Username
}
} else if err != nil {
return "", err
}
return userInfo.Name, nil
}
// getContextNicknameFromConfig returns "namespace/getClusterNicknameFromConfig/username(as known by the server)". This allows tab completion for switching projects/context
// to work easily. First tab is the most selective on project. Second stanza in the next most selective on cluster name. The chances of a user trying having
// one projects on a single server that they want to operate against with two identities is low, so username is last.
func getContextNicknameFromConfig(namespace string, clientCfg *restclient.Config) (string, error) {
userPartOfNick, err := getUserPartOfNickname(clientCfg)
if err != nil {
return "", err
}
clusterNick, err := getClusterNicknameFromConfig(clientCfg)
if err != nil {
return "", err
}
return namespace + "/" + clusterNick + "/" + userPartOfNick, nil
}
// CreateConfig takes a clientCfg and builds a config (kubeconfig style) from it.
func CreateConfig(namespace string, clientCfg *restclient.Config) (*clientcmdapi.Config, error) {
clusterNick, err := getClusterNicknameFromConfig(clientCfg)
if err != nil {
return nil, err
}
userNick, err := getUserNicknameFromConfig(clientCfg)
if err != nil {
return nil, err
}
contextNick, err := getContextNicknameFromConfig(namespace, clientCfg)
if err != nil {
return nil, err
}
config := clientcmdapi.NewConfig()
credentials := clientcmdapi.NewAuthInfo()
credentials.Token = clientCfg.BearerToken
credentials.ClientCertificate = clientCfg.TLSClientConfig.CertFile
if len(credentials.ClientCertificate) == 0 {
credentials.ClientCertificateData = clientCfg.TLSClientConfig.CertData
}
credentials.ClientKey = clientCfg.TLSClientConfig.KeyFile
if len(credentials.ClientKey) == 0 {
credentials.ClientKeyData = clientCfg.TLSClientConfig.KeyData
}
config.AuthInfos[userNick] = credentials
cluster := clientcmdapi.NewCluster()
cluster.Server = clientCfg.Host
cluster.CertificateAuthority = clientCfg.CAFile
if len(cluster.CertificateAuthority) == 0 {
cluster.CertificateAuthorityData = clientCfg.CAData
}
cluster.InsecureSkipTLSVerify = clientCfg.Insecure
config.Clusters[clusterNick] = cluster
context := clientcmdapi.NewContext()
context.Cluster = clusterNick
context.AuthInfo = userNick
context.Namespace = namespace
config.Contexts[contextNick] = context
config.CurrentContext = contextNick
return config, nil
}
// MergeConfig adds the additional Config stanzas to the startingConfig. It blindly stomps clusters and users, but
// it searches for a matching context before writing a new one.
func MergeConfig(startingConfig, addition clientcmdapi.Config) (*clientcmdapi.Config, error) {
ret := startingConfig
for requestedKey, value := range addition.Clusters {
ret.Clusters[requestedKey] = value
}
for requestedKey, value := range addition.AuthInfos {
ret.AuthInfos[requestedKey] = value
}
requestedContextNamesToActualContextNames := map[string]string{}
for requestedKey, newContext := range addition.Contexts {
actualContext := clientcmdapi.NewContext()
actualContext.AuthInfo = newContext.AuthInfo
actualContext.Cluster = newContext.Cluster
actualContext.Namespace = newContext.Namespace
actualContext.Extensions = newContext.Extensions
if existingName := findExistingContextName(startingConfig, *actualContext); len(existingName) > 0 {
// if this already exists, just move to the next, our job is done
requestedContextNamesToActualContextNames[requestedKey] = existingName
continue
}
requestedContextNamesToActualContextNames[requestedKey] = requestedKey
ret.Contexts[requestedKey] = actualContext
}
if len(addition.CurrentContext) > 0 {
if newCurrentContext, exists := requestedContextNamesToActualContextNames[addition.CurrentContext]; exists {
ret.CurrentContext = newCurrentContext
} else {
ret.CurrentContext = addition.CurrentContext
}
}
return &ret, nil
}
// findExistingContextName finds the nickname for the passed context
func findExistingContextName(haystack clientcmdapi.Config, needle clientcmdapi.Context) string {
for key, context := range haystack.Contexts {
context.LocationOfOrigin = ""
if reflect.DeepEqual(context, needle) {
return key
}
}
return ""
}
// GetClusterNicknameFromURL returns host:port of the apiServerLocation, with .'s replaced by -'s
func GetClusterNicknameFromURL(apiServerLocation string) (string, error) {
u, err := url.Parse(apiServerLocation)
if err != nil {
return "", err
}
hostPort := netutil.CanonicalAddr(u)
// we need a character other than "." to avoid conflicts with. replace with '-'
return strings.Replace(hostPort, ".", "-", -1), nil
}
func GetUserNicknameFromCert(clusterNick string, chain ...*x509.Certificate) (string, error) {
authResponse, _, err := x509request.CommonNameUserConversion(chain)
if err != nil {
return "", err
}
return authResponse.User.GetName() + "/" + clusterNick, nil
}
func GetContextNickname(namespace, clusterNick, userNick string) string {
tokens := strings.SplitN(userNick, "/", 2)
return namespace + "/" + clusterNick + "/" + tokens[0]
}
var validURLSchemes = []string{"https://", "http://", "tcp://"}
// NormalizeServerURL is opinionated normalization of a string that represents a URL. Returns the URL provided matching the format
// expected when storing a URL in a config. Sets a scheme and port if not present, removes unnecessary trailing
// slashes, etc. Can be used to normalize a URL provided by user input.
func NormalizeServerURL(s string) (string, error) {
// normalize scheme
if !hasScheme(s) {
s = validURLSchemes[0] + s
}
addr, err := url.Parse(s)
if err != nil {
return "", fmt.Errorf("Not a valid URL: %v.", err)
}
// normalize host:port
if strings.Contains(addr.Host, ":") {
_, port, err := net.SplitHostPort(addr.Host)
if err != nil {
return "", fmt.Errorf("Not a valid host:port: %v.", err)
}
_, err = strconv.ParseUint(port, 10, 16)
if err != nil {
return "", fmt.Errorf("Not a valid port: %v. Port numbers must be between 0 and 65535.", port)
}
} else {
port := 0
switch addr.Scheme {
case "http":
port = 80
case "https":
port = 443
default:
return "", fmt.Errorf("No port specified.")
}
addr.Host = net.JoinHostPort(addr.Host, strconv.FormatInt(int64(port), 10))
}
// remove trailing slash if that's the only path we have
if addr.Path == "/" {
addr.Path = ""
}
return addr.String(), nil
}
func hasScheme(s string) bool {
for _, p := range validURLSchemes {
if strings.HasPrefix(s, p) {
return true
}
}
return false
}