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forked from docker/libcompose
/
config.go
227 lines (198 loc) · 6.37 KB
/
config.go
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package cliconfig
import (
"encoding/base64"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/docker/docker/pkg/homedir"
"github.com/docker/docker/pkg/system"
)
const (
// ConfigFile is the name of config file
ConfigFileName = "config.json"
oldConfigfile = ".dockercfg"
// This constant is only used for really old config files when the
// URL wasn't saved as part of the config file and it was just
// assumed to be this value.
defaultIndexserver = "https://index.docker.io/v1/"
)
var (
configDir = os.Getenv("DOCKER_CONFIG")
)
func init() {
if configDir == "" {
configDir = filepath.Join(homedir.Get(), ".docker")
}
}
// ConfigDir returns the directory the configuration file is stored in
func ConfigDir() string {
return configDir
}
// SetConfigDir sets the directory the configuration file is stored in
func SetConfigDir(dir string) {
configDir = dir
}
// AuthConfig contains authorization information for connecting to a Registry
type AuthConfig struct {
Username string `json:"username,omitempty"`
Password string `json:"password,omitempty"`
Auth string `json:"auth"`
Email string `json:"email"`
ServerAddress string `json:"serveraddress,omitempty"`
}
// ConfigFile ~/.docker/config.json file info
type ConfigFile struct {
AuthConfigs map[string]AuthConfig `json:"auths"`
HTTPHeaders map[string]string `json:"HttpHeaders,omitempty"`
PsFormat string `json:"psFormat,omitempty"`
filename string // Note: not serialized - for internal use only
}
// NewConfigFile initilizes an empty configuration file for the given filename 'fn'
func NewConfigFile(fn string) *ConfigFile {
return &ConfigFile{
AuthConfigs: make(map[string]AuthConfig),
HTTPHeaders: make(map[string]string),
filename: fn,
}
}
// Load reads the configuration files in the given directory, and sets up
// the auth config information and return values.
// FIXME: use the internal golang config parser
func Load(configDir string) (*ConfigFile, error) {
if configDir == "" {
configDir = ConfigDir()
}
configFile := ConfigFile{
AuthConfigs: make(map[string]AuthConfig),
filename: filepath.Join(configDir, ConfigFileName),
}
// Try happy path first - latest config file
if _, err := os.Stat(configFile.filename); err == nil {
file, err := os.Open(configFile.filename)
if err != nil {
return &configFile, err
}
defer file.Close()
if err := json.NewDecoder(file).Decode(&configFile); err != nil {
return &configFile, err
}
for addr, ac := range configFile.AuthConfigs {
ac.Username, ac.Password, err = DecodeAuth(ac.Auth)
if err != nil {
return &configFile, err
}
ac.Auth = ""
ac.ServerAddress = addr
configFile.AuthConfigs[addr] = ac
}
return &configFile, nil
} else if !os.IsNotExist(err) {
// if file is there but we can't stat it for any reason other
// than it doesn't exist then stop
return &configFile, err
}
// Can't find latest config file so check for the old one
confFile := filepath.Join(homedir.Get(), oldConfigfile)
if _, err := os.Stat(confFile); err != nil {
return &configFile, nil //missing file is not an error
}
b, err := ioutil.ReadFile(confFile)
if err != nil {
return &configFile, err
}
if err := json.Unmarshal(b, &configFile.AuthConfigs); err != nil {
arr := strings.Split(string(b), "\n")
if len(arr) < 2 {
return &configFile, fmt.Errorf("The Auth config file is empty")
}
authConfig := AuthConfig{}
origAuth := strings.Split(arr[0], " = ")
if len(origAuth) != 2 {
return &configFile, fmt.Errorf("Invalid Auth config file")
}
authConfig.Username, authConfig.Password, err = DecodeAuth(origAuth[1])
if err != nil {
return &configFile, err
}
origEmail := strings.Split(arr[1], " = ")
if len(origEmail) != 2 {
return &configFile, fmt.Errorf("Invalid Auth config file")
}
authConfig.Email = origEmail[1]
authConfig.ServerAddress = defaultIndexserver
configFile.AuthConfigs[defaultIndexserver] = authConfig
} else {
for k, authConfig := range configFile.AuthConfigs {
authConfig.Username, authConfig.Password, err = DecodeAuth(authConfig.Auth)
if err != nil {
return &configFile, err
}
authConfig.Auth = ""
authConfig.ServerAddress = k
configFile.AuthConfigs[k] = authConfig
}
}
return &configFile, nil
}
// Save encodes and writes out all the authorization information
func (configFile *ConfigFile) Save() error {
// Encode sensitive data into a new/temp struct
tmpAuthConfigs := make(map[string]AuthConfig, len(configFile.AuthConfigs))
for k, authConfig := range configFile.AuthConfigs {
authCopy := authConfig
// encode and save the authstring, while blanking out the original fields
authCopy.Auth = EncodeAuth(&authCopy)
authCopy.Username = ""
authCopy.Password = ""
authCopy.ServerAddress = ""
tmpAuthConfigs[k] = authCopy
}
saveAuthConfigs := configFile.AuthConfigs
configFile.AuthConfigs = tmpAuthConfigs
defer func() { configFile.AuthConfigs = saveAuthConfigs }()
data, err := json.MarshalIndent(configFile, "", "\t")
if err != nil {
return err
}
if err := system.MkdirAll(filepath.Dir(configFile.filename), 0700); err != nil {
return err
}
if err := ioutil.WriteFile(configFile.filename, data, 0600); err != nil {
return err
}
return nil
}
// Filename returns the name of the configuration file
func (configFile *ConfigFile) Filename() string {
return configFile.filename
}
// EncodeAuth creates a base64 encoded string to containing authorization information
func EncodeAuth(authConfig *AuthConfig) string {
authStr := authConfig.Username + ":" + authConfig.Password
msg := []byte(authStr)
encoded := make([]byte, base64.StdEncoding.EncodedLen(len(msg)))
base64.StdEncoding.Encode(encoded, msg)
return string(encoded)
}
// DecodeAuth decodes a base64 encoded string and returns username and password
func DecodeAuth(authStr string) (string, string, error) {
decLen := base64.StdEncoding.DecodedLen(len(authStr))
decoded := make([]byte, decLen)
authByte := []byte(authStr)
n, err := base64.StdEncoding.Decode(decoded, authByte)
if err != nil {
return "", "", err
}
if n > decLen {
return "", "", fmt.Errorf("Something went wrong decoding auth config")
}
arr := strings.SplitN(string(decoded), ":", 2)
if len(arr) != 2 {
return "", "", fmt.Errorf("Invalid auth configuration file")
}
password := strings.Trim(arr[1], "\x00")
return arr[0], password, nil
}