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127 lines
3.8 KiB
Go
127 lines
3.8 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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/*
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Package auth defines a file format for holding authentication
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information needed by clients of Kubernetes. Typically,
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a Kubernetes cluster will put auth info for the admin in a known
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location when it is created, and will (soon) put it in a known
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location within a Container's file tree for Containers that
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need access to the Kubernetes API.
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Having a defined format allows:
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- clients to be implemented in multiple languages
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- applications which link clients to be portable across
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clusters with different authentication styles (e.g.
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some may use SSL Client certs, others may not, etc)
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- when the format changes, applications only
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need to update this code.
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The file format is json, marshalled from a struct authcfg.Info.
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Clinet libraries in other languages should use the same format.
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It is not intended to store general preferences, such as default
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namespace, output options, etc. CLIs (such as kubectl) and UIs should
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develop their own format and may wish to inline the authcfg.Info type.
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The authcfg.Info is just a file format. It is distinct from
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client.Config which holds options for creating a client.Client.
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Helper functions are provided in this package to fill in a
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client.Client from an authcfg.Info.
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Example:
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import (
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"pkg/client"
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"pkg/client/auth"
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)
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info, err := auth.LoadFromFile(filename)
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if err != nil {
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// handle error
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}
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clientConfig = client.Config{}
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clientConfig.Host = "example.com:4901"
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clientConfig = info.MergeWithConfig()
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client := client.New(clientConfig)
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client.Pods(ns).List()
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*/
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package auth
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// TODO: need a way to rotate Tokens. Therefore, need a way for client object to be reset when the authcfg is updated.
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import (
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"encoding/json"
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"io/ioutil"
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"os"
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restclient "k8s.io/client-go/rest"
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)
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// Info holds Kubernetes API authorization config. It is intended
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// to be read/written from a file as a JSON object.
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type Info struct {
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User string
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Password string `datapolicy:"password"`
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CAFile string
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CertFile string
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KeyFile string
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BearerToken string `datapolicy:"token"`
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Insecure *bool
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}
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// LoadFromFile parses an Info object from a file path.
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// If the file does not exist, then os.IsNotExist(err) == true
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func LoadFromFile(path string) (*Info, error) {
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var info Info
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if _, err := os.Stat(path); os.IsNotExist(err) {
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return nil, err
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}
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data, err := ioutil.ReadFile(path)
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if err != nil {
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return nil, err
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}
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err = json.Unmarshal(data, &info)
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if err != nil {
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return nil, err
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}
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return &info, err
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}
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// MergeWithConfig returns a copy of a client.Config with values from the Info.
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// The fields of client.Config with a corresponding field in the Info are set
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// with the value from the Info.
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func (info Info) MergeWithConfig(c restclient.Config) (restclient.Config, error) {
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var config = c
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config.Username = info.User
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config.Password = info.Password
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config.CAFile = info.CAFile
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config.CertFile = info.CertFile
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config.KeyFile = info.KeyFile
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config.BearerToken = info.BearerToken
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if info.Insecure != nil {
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config.Insecure = *info.Insecure
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}
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return config, nil
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}
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// Complete returns true if the Kubernetes API authorization info is complete.
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func (info Info) Complete() bool {
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return len(info.User) > 0 ||
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len(info.CertFile) > 0 ||
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len(info.BearerToken) > 0
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}
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