move password handling into a single file

irc/commands.go

@@ -1,7 +1,6 @@
 package irc
 
 import (
-	"code.google.com/p/go.crypto/bcrypt"
 	"code.google.com/p/go.text/unicode/norm"
 	"errors"
 	"fmt"
@@ -214,7 +213,7 @@ func (cmd *PassCommand) CheckPassword() {
 	if cmd.hash == nil {
 		return
 	}
-	cmd.err = bcrypt.CompareHashAndPassword(cmd.hash, cmd.password)
+	cmd.err = ComparePassword(cmd.hash, cmd.password)
 }
 
 func NewPassCommand(args []string) (editableCommand, error) {

irc/config.go

@@ -1,7 +1,6 @@
 package irc
 
 import (
-	"encoding/base64"
 	"encoding/json"
 	"log"
 	"os"
@@ -9,10 +8,7 @@ import (
 )
 
 func decodePassword(password string) []byte {
-	if password == "" {
-		return nil
-	}
-	bytes, err := base64.StdEncoding.DecodeString(password)
+	bytes, err := DecodePassword(password)
 	if err != nil {
 		log.Fatal(err)
 	}

irc/password.go

@@ -0,0 +1,37 @@
+package irc
+
+import (
+	"code.google.com/p/go.crypto/bcrypt"
+	"encoding/base64"
+	"errors"
+)
+
+var (
+	EmptyPasswordError = errors.New("empty password")
+)
+
+func GenerateEncodedPassword(passwd string) (encoded string, err error) {
+	if passwd == "" {
+		err = EmptyPasswordError
+		return
+	}
+	bcrypted, err := bcrypt.GenerateFromPassword([]byte(passwd), bcrypt.MinCost)
+	if err != nil {
+		return
+	}
+	encoded = base64.StdEncoding.EncodeToString(bcrypted)
+	return
+}
+
+func DecodePassword(encoded string) (decoded []byte, err error) {
+	if encoded == "" {
+		err = EmptyPasswordError
+		return
+	}
+	decoded, err = base64.StdEncoding.DecodeString(encoded)
+	return
+}
+
+func ComparePassword(hash, password []byte) error {
+	return bcrypt.CompareHashAndPassword(hash, password)
+}