mirror of https://github.com/kubernetes/kops.git
131 lines
3.3 KiB
Go
131 lines
3.3 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package client
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import (
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"context"
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"errors"
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"fmt"
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"io/ioutil"
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"net/url"
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"os"
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"path/filepath"
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"k8s.io/kops/node-authorizer/pkg/utils"
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"go.uber.org/zap"
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)
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// New returns a client verifier
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func New(config *Config) error {
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if err := config.IsValid(); err != nil {
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return err
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}
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utils.Logger.Info("attempting to acquire a node bootstrap configuration",
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zap.Duration("timeout", config.Timeout),
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zap.String("authorizer", config.Authorizer),
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zap.String("kubeapi-url", config.KubeAPI),
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zap.String("kubeconfig", config.KubeConfigPath),
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zap.String("registration-url", config.NodeURL))
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// @step: if we have a kubecfg already we can skip it
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if utils.FileExists(config.KubeConfigPath) {
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utils.Logger.Info("skipping the client authorization as kubecfg found",
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zap.String("kubecfg", config.KubeConfigPath))
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return nil
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}
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// @step: create the verifier
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verifier, err := newNodeVerifier(config.Authorizer)
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if err != nil {
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return err
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}
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hc, err := makeHTTPClient(config)
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if err != nil {
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return err
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}
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// @step: attempt to get the token
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err = utils.Retry(context.TODO(), config.Interval, config.Timeout, func() error {
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token, err := makeTokenRequest(context.TODO(), hc, verifier, config)
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if err != nil {
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utils.Logger.Error("failed to request bootstrap token from node authorizer service", zap.Error(err))
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return err
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}
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// @check if we have been refused
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if !token.IsAllowed() {
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utils.Logger.Error("node has beeen refused registration",
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zap.String("reason", token.Status.Reason))
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os.Exit(1)
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}
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utils.Logger.Info("successfully requested bootstrap token from service")
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utils.Logger.Info("attempting to write bootstrap configuration")
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kubeconfig, err := makeKubeconfig(context.TODO(), config, token.Status.Token)
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if err != nil {
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utils.Logger.Error("failed to generate the bootstrap token configuration",
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zap.String("path", config.KubeConfigPath),
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zap.Error(err))
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return err
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}
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dirname := filepath.Dir(config.KubeConfigPath)
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if err := os.MkdirAll(dirname, os.FileMode(0770)); err != nil {
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return err
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}
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return ioutil.WriteFile(config.KubeConfigPath, kubeconfig, os.FileMode(0640))
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})
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if err != nil {
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fmt.Fprintf(os.Stderr, "[error] %s\n", err)
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os.Exit(1)
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}
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utils.Logger.Info("successfully wrote bootstrap configuration")
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return nil
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}
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// IsValid validates the client configuration
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func (c *Config) IsValid() error {
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if c.Authorizer == "" {
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return errors.New("no authorzier")
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}
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if c.KubeAPI == "" {
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return errors.New("no kubeapi url")
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}
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if c.KubeConfigPath == "" {
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return errors.New("no bootstrap kubeconfig path")
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}
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if c.Timeout <= 0 {
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return errors.New("timeout must be greater than zero")
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}
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if _, err := url.Parse(c.KubeAPI); err != nil {
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return fmt.Errorf("invalid kubeapi url: %s", err)
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}
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return nil
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}
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