source: code/trunk/cmd/sojuctl/main.go@ 736

package main

import (
        "bufio"
        "context"
        "flag"
        "fmt"
        "io"
        "log"
        "os"

        "git.sr.ht/~emersion/soju"
        "git.sr.ht/~emersion/soju/config"
        "golang.org/x/crypto/bcrypt"
        "golang.org/x/crypto/ssh/terminal"
)

const usage = `usage: sojuctl [-config path] <action> [options...]

  create-user <username> [-admin]  Create a new user
  change-password <username>       Change password for a user
  help                             Show this help message
`

func init() {
        flag.Usage = func() {
                fmt.Fprintf(flag.CommandLine.Output(), usage)
        }
}

func main() {
        var configPath string
        flag.StringVar(&configPath, "config", "", "path to configuration file")
        flag.Parse()

        var cfg *config.Server
        if configPath != "" {
                var err error
                cfg, err = config.Load(configPath)
                if err != nil {
                        log.Fatalf("failed to load config file: %v", err)
                }
        } else {
                cfg = config.Defaults()
        }

        db, err := soju.OpenDB(cfg.SQLDriver, cfg.SQLSource)
        if err != nil {
                log.Fatalf("failed to open database: %v", err)
        }

        ctx := context.Background()

        switch cmd := flag.Arg(0); cmd {
        case "create-user":
                username := flag.Arg(1)
                if username == "" {
                        flag.Usage()
                        os.Exit(1)
                }

                fs := flag.NewFlagSet("", flag.ExitOnError)
                admin := fs.Bool("admin", false, "make the new user admin")
                fs.Parse(flag.Args()[2:])

                password, err := readPassword()
                if err != nil {
                        log.Fatalf("failed to read password: %v", err)
                }

                hashed, err := bcrypt.GenerateFromPassword(password, bcrypt.DefaultCost)
                if err != nil {
                        log.Fatalf("failed to hash password: %v", err)
                }

                user := soju.User{
                        Username: username,
                        Password: string(hashed),
                        Admin:    *admin,
                }
                if err := db.StoreUser(ctx, &user); err != nil {
                        log.Fatalf("failed to create user: %v", err)
                }
        case "change-password":
                username := flag.Arg(1)
                if username == "" {
                        flag.Usage()
                        os.Exit(1)
                }

                user, err := db.GetUser(ctx, username)
                if err != nil {
                        log.Fatalf("failed to get user: %v", err)
                }

                password, err := readPassword()
                if err != nil {
                        log.Fatalf("failed to read password: %v", err)
                }

                hashed, err := bcrypt.GenerateFromPassword(password, bcrypt.DefaultCost)
                if err != nil {
                        log.Fatalf("failed to hash password: %v", err)
                }

                user.Password = string(hashed)
                if err := db.StoreUser(ctx, user); err != nil {
                        log.Fatalf("failed to update password: %v", err)
                }
        default:
                flag.Usage()
                if cmd != "help" {
                        os.Exit(1)
                }
        }
}

func readPassword() ([]byte, error) {
        var password []byte
        var err error
        fd := int(os.Stdin.Fd())

        if terminal.IsTerminal(fd) {
                fmt.Printf("Password: ")
                password, err = terminal.ReadPassword(int(os.Stdin.Fd()))
                if err != nil {
                        return nil, err
                }
                fmt.Printf("\n")
        } else {
                fmt.Fprintf(os.Stderr, "Warning: Reading password from stdin.\n")
                // TODO: the buffering messes up repeated calls to readPassword
                scanner := bufio.NewScanner(os.Stdin)
                if !scanner.Scan() {
                        if err := scanner.Err(); err != nil {
                                return nil, err
                        }
                        return nil, io.ErrUnexpectedEOF
                }
                password = scanner.Bytes()

                if len(password) == 0 {
                        return nil, fmt.Errorf("zero length password")
                }
        }

        return password, nil
}