Single user refactor

internal/utils/address.go

@@ -1,19 +1,35 @@
 package utils
 
 import (
+	"crypto/ed25519"
 	"fmt"
 	"strings"
+
+	"github.com/jxskiss/base62"
 )
 
-const TLD = ".yggmail"
+const Domain = "yggmail"
 
-func ParseAddress(email string) (string, string, error) {
-	if !strings.HasSuffix(email, TLD) {
-		return "", "", fmt.Errorf("invalid TLD")
-	}
+func CreateAddress(pk ed25519.PublicKey) string {
+	return fmt.Sprintf(
+		"%s@%s",
+		pk, Domain,
+	)
+}
+
+func ParseAddress(email string) (ed25519.PublicKey, error) {
 	at := strings.LastIndex(email, "@")
 	if at == 0 {
-		return "", "", fmt.Errorf("invalid email address")
+		return nil, fmt.Errorf("invalid email address")
 	}
-	return email[:at], strings.TrimSuffix(email[at+1:], TLD), nil
+	if email[at+1:] != Domain {
+		return nil, fmt.Errorf("invalid email domain")
+	}
+	pk, err := base62.DecodeString(email[:at])
+	if err != nil {
+		return nil, fmt.Errorf("base62.DecodeString: %w", err)
+	}
+	ed := make(ed25519.PublicKey, ed25519.PublicKeySize)
+	copy(ed, pk)
+	return ed, nil
 }