Add parameters to specify password (#1868)

* Add parameters to specify password

Signed-off-by: Till Faelligen <tfaelligen@gmail.com>

* Fix typo

* Add testdata

* Use go1.13 compatible way to read files

cmd/create-account/main.go

@@ -18,13 +18,18 @@ import (
 	"context"
 	"flag"
 	"fmt"
+	"io"
+	"io/ioutil"
 	"os"
+	"strings"
+	"syscall"
 
 	"github.com/matrix-org/dendrite/setup"
 	"github.com/matrix-org/dendrite/setup/config"
 	"github.com/matrix-org/dendrite/userapi/storage/accounts"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/crypto/bcrypt"
+	"golang.org/x/term"
 )
 
 const usage = `Usage: %s
@@ -33,7 +38,15 @@ Creates a new user account on the homeserver.
 
 Example:
 
-  ./create-account --config dendrite.yaml --username alice --password foobarbaz
+	# provide password by parameter
+  	%s --config dendrite.yaml -username alice -password foobarbaz
+	# use password from file
+  	%s --config dendrite.yaml -username alice -passwordfile my.pass
+	# ask user to provide password
+	%s --config dendrite.yaml -username alice -ask-pass
+	# read password from stdin
+	%s --config dendrite.yaml -username alice -passwordstdin < my.pass
+	cat my.pass | %s --config dendrite.yaml -username alice -passwordstdin
 
 Arguments:
 
@@ -42,11 +55,15 @@ Arguments:
 var (
 	username = flag.String("username", "", "The username of the account to register (specify the localpart only, e.g. 'alice' for '@alice:domain.com')")
 	password = flag.String("password", "", "The password to associate with the account (optional, account will be password-less if not specified)")
+	pwdFile  = flag.String("passwordfile", "", "The file to use for the password (e.g. for automated account creation)")
+	pwdStdin = flag.Bool("passwordstdin", false, "Reads the password from stdin")
+	askPass  = flag.Bool("ask-pass", false, "Ask for the password to use")
 )
 
 func main() {
+	name := os.Args[0]
 	flag.Usage = func() {
-		fmt.Fprintf(os.Stderr, usage, os.Args[0])
+		_, _ = fmt.Fprintf(os.Stderr, usage, name, name, name, name, name, name)
 		flag.PrintDefaults()
 	}
 	cfg := setup.ParseFlags(true)
@@ -56,6 +73,8 @@ func main() {
 		os.Exit(1)
 	}
 
+	pass := getPassword(password, pwdFile, pwdStdin, askPass, os.Stdin)
+
 	accountDB, err := accounts.NewDatabase(&config.DatabaseOptions{
 		ConnectionString: cfg.UserAPI.AccountDatabase.ConnectionString,
 	}, cfg.Global.ServerName, bcrypt.DefaultCost, cfg.UserAPI.OpenIDTokenLifetimeMS)
@@ -63,10 +82,61 @@ func main() {
 		logrus.Fatalln("Failed to connect to the database:", err.Error())
 	}
 
-	_, err = accountDB.CreateAccount(context.Background(), *username, *password, "")
+	_, err = accountDB.CreateAccount(context.Background(), *username, pass, "")
 	if err != nil {
 		logrus.Fatalln("Failed to create the account:", err.Error())
 	}
 
 	logrus.Infoln("Created account", *username)
 }
+
+func getPassword(password, pwdFile *string, pwdStdin, askPass *bool, r io.Reader) string {
+	// no password option set, use empty password
+	if password == nil && pwdFile == nil && pwdStdin == nil && askPass == nil {
+		return ""
+	}
+	// password defined as parameter
+	if password != nil && *password != "" {
+		return *password
+	}
+
+	// read password from file
+	if pwdFile != nil && *pwdFile != "" {
+		pw, err := ioutil.ReadFile(*pwdFile)
+		if err != nil {
+			logrus.Fatalln("Unable to read password from file:", err)
+		}
+		return strings.TrimSpace(string(pw))
+	}
+
+	// read password from stdin
+	if pwdStdin != nil && *pwdStdin {
+		data, err := ioutil.ReadAll(r)
+		if err != nil {
+			logrus.Fatalln("Unable to read password from stdin:", err)
+		}
+		return strings.TrimSpace(string(data))
+	}
+
+	// ask the user to provide the password
+	if *askPass {
+		fmt.Print("Enter Password: ")
+		bytePassword, err := term.ReadPassword(syscall.Stdin)
+		if err != nil {
+			logrus.Fatalln("Unable to read password:", err)
+		}
+		fmt.Println()
+		fmt.Print("Confirm Password: ")
+		bytePassword2, err := term.ReadPassword(syscall.Stdin)
+		if err != nil {
+			logrus.Fatalln("Unable to read password:", err)
+		}
+		fmt.Println()
+		if strings.TrimSpace(string(bytePassword)) != strings.TrimSpace(string(bytePassword2)) {
+			logrus.Fatalln("Entered passwords don't match")
+		}
+		return strings.TrimSpace(string(bytePassword))
+	}
+
+	return ""
+}