You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: file.go
    path of file: ./repos/kubeedge/vendor/github.com/docker/cli/cli/config/configfile
    
    the code of the file until where you have to start completion: package configfile

import (
	"encoding/base64"
	"encoding/json"
	"io"
	"os"
	"path/filepath"
	"strings"

	"github.com/docker/cli/cli/config/credentials"
	"github.com/docker/cli/cli/config/types"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
)

// ConfigFile ~/.docker/config.json file info
type ConfigFile struct {
	AuthConfigs          map[string]types.AuthConfig  `json:"auths"`
	HTTPHeaders          map[string]string            `json:"HttpHeaders,omitempty"`
	PsFormat             string 
    
func decodeAuth(authStr string) (string, string, error) {
	if authStr == "" {
		return "", "", nil
	}

	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 "", "", errors.Errorf("Something went wrong decoding auth config")
	}
	userName, password, ok := strings.Cut(string(decoded), ":")
	if !ok || userName == "" {
		return "", "", errors.Errorf("Invalid auth configuration file")
	}
	return userName, strings.Trim(password, "\x00"), nil
}