112 lines
3.1 KiB
Go
112 lines
3.1 KiB
Go
/*
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Copyright 2014 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 clientcmd
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import (
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"golang.org/x/crypto/ssh/terminal"
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clientauth "k8s.io/client-go/tools/auth"
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)
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// AuthLoaders are used to build clientauth.Info objects.
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type AuthLoader interface {
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// LoadAuth takes a path to a config file and can then do anything it needs in order to return a valid clientauth.Info
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LoadAuth(path string) (*clientauth.Info, error)
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}
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// default implementation of an AuthLoader
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type defaultAuthLoader struct{}
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// LoadAuth for defaultAuthLoader simply delegates to clientauth.LoadFromFile
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func (*defaultAuthLoader) LoadAuth(path string) (*clientauth.Info, error) {
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return clientauth.LoadFromFile(path)
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}
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type PromptingAuthLoader struct {
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reader io.Reader
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}
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// LoadAuth parses an AuthInfo object from a file path. It prompts user and creates file if it doesn't exist.
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func (a *PromptingAuthLoader) LoadAuth(path string) (*clientauth.Info, error) {
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// Prompt for user/pass and write a file if none exists.
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if _, err := os.Stat(path); os.IsNotExist(err) {
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authPtr, err := a.Prompt()
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auth := *authPtr
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if err != nil {
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return nil, err
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}
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data, err := json.Marshal(auth)
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if err != nil {
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return &auth, err
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}
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err = ioutil.WriteFile(path, data, 0600)
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return &auth, err
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}
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authPtr, err := clientauth.LoadFromFile(path)
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if err != nil {
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return nil, err
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}
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return authPtr, nil
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}
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// Prompt pulls the user and password from a reader
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func (a *PromptingAuthLoader) Prompt() (*clientauth.Info, error) {
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var err error
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auth := &clientauth.Info{}
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auth.User, err = promptForString("Username", a.reader, true)
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if err != nil {
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return nil, err
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}
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auth.Password, err = promptForString("Password", nil, false)
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if err != nil {
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return nil, err
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}
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return auth, nil
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}
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func promptForString(field string, r io.Reader, show bool) (result string, err error) {
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fmt.Printf("Please enter %s: ", field)
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if show {
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_, err = fmt.Fscan(r, &result)
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} else {
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var data []byte
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if terminal.IsTerminal(int(os.Stdin.Fd())) {
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data, err = terminal.ReadPassword(int(os.Stdin.Fd()))
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result = string(data)
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} else {
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return "", fmt.Errorf("error reading input for %s", field)
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}
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}
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return result, err
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}
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// NewPromptingAuthLoader is an AuthLoader that parses an AuthInfo object from a file path. It prompts user and creates file if it doesn't exist.
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func NewPromptingAuthLoader(reader io.Reader) *PromptingAuthLoader {
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return &PromptingAuthLoader{reader}
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}
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// NewDefaultAuthLoader returns a default implementation of an AuthLoader that only reads from a config file
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func NewDefaultAuthLoader() AuthLoader {
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return &defaultAuthLoader{}
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}
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