CalAnonSync/src/calanonsync/settings.go

package main

import (
	"encoding/json"
	"fmt"
	"github.com/spf13/cobra"
	"golang.org/x/crypto/ssh/terminal"
	"os"
	"strings"
	"syscall"
)

type ServerSettings struct {
	URL      string
	Username string
	Password string
}

type Settings struct {
	EWS       ServerSettings
	CalDAV    ServerSettings
	Anonymize struct {
		Title string
	}
}

func ensurePassword(password *string, name string) {
	if *password != "" {
		// Nothing to do. Password already set.
		return
	}

	print(name + " password: ")
	b, err := terminal.ReadPassword(int(syscall.Stdin))
	println()
	if err != nil {
		panic(err)
	}

	*password = string(b)
}

func LoadSettings() Settings {
	f, err := os.Open("calanonsync.json")
	if err != nil {
		panic(err)
	}
	settings := Settings{}
	err = json.NewDecoder(f).Decode(&settings)
	if err != nil {
		panic(err)
	}

	if settings.CalDAV.URL != "" && !strings.HasSuffix(settings.CalDAV.URL, "/") {
		settings.CalDAV.URL += "/"
	}

	ensurePassword(&settings.EWS.Password, "EWS")
	ensurePassword(&settings.CalDAV.Password, "CalDAV")

	return settings
}

func InitSettingsCmd() *cobra.Command {
	settingsCmd := &cobra.Command{
		Use:   "settings",
		Short: "Manage settings.",
	}

	encryptCmd := &cobra.Command{
		Use:   "encrypt",
		Short: "Encrypt the passwords in the settings file.",
		Long: `This will encrypt the passwords in the settings file that are
not empty. It will generate a new "master" password and store that alongside
the settings file. This is NOT secure, it just helps to prevent
over-the-shoulder "attacks".`,
		Run: func(cmd *cobra.Command, args []string) {
			fmt.Println("Encrypt")
		},
	}

	decryptCmd := &cobra.Command{
		Use:   "decrypt",
		Short: "Decrypt a previously encrypted settings file.",
		Run: func(cmd *cobra.Command, args []string) {
			fmt.Println("Decrypt")
		},
	}

	settingsCmd.AddCommand(encryptCmd, decryptCmd)
	return settingsCmd
}