Handle reservation for sub authority

x/registry/keeper/naming_keeper.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"net/url"
+	"strings"
 
 	"cosmossdk.io/collections"
 	errorsmod "cosmossdk.io/errors"
@@ -185,10 +186,9 @@ func (k Keeper) ReserveAuthority(ctx sdk.Context, msg registrytypes.MsgReserveAu
 		return errorsmod.Wrap(sdkerrors.ErrInvalidRequest, "Invalid name")
 	}
 
-	// TODO
-	// if strings.Contains(name, ".") {
-	// 	return k.ProcessReserveSubAuthority(ctx, name, msg)
-	// }
+	if strings.Contains(name, ".") {
+		return k.ReserveSubAuthority(ctx, name, msg)
+	}
 
 	err = k.createAuthority(ctx, name, msg.GetSigner(), true)
 	if err != nil {
@@ -198,6 +198,45 @@ func (k Keeper) ReserveAuthority(ctx sdk.Context, msg registrytypes.MsgReserveAu
 	return nil
 }
 
+// ReserveSubAuthority reserves a sub-authority.
+func (k Keeper) ReserveSubAuthority(ctx sdk.Context, name string, msg registrytypes.MsgReserveAuthority) error {
+	// Get parent authority name.
+	names := strings.Split(name, ".")
+	parent := strings.Join(names[1:], ".")
+
+	// Check if parent authority exists.
+	if has, err := k.HasNameAuthority(ctx, parent); !has {
+		if err != nil {
+			return err
+		}
+
+		return errorsmod.Wrap(sdkerrors.ErrInvalidRequest, "Parent authority not found.")
+	}
+	parentAuthority, err := k.GetNameAuthority(ctx, parent)
+	if err != nil {
+		return err
+	}
+
+	// Sub-authority creator needs to be the owner of the parent authority.
+	if parentAuthority.OwnerAddress != msg.Signer {
+		return errorsmod.Wrap(sdkerrors.ErrUnauthorized, "Access denied.")
+	}
+
+	// Sub-authority owner defaults to parent authority owner.
+	subAuthorityOwner := msg.Signer
+	if len(msg.Owner) != 0 {
+		// Override sub-authority owner if provided in message.
+		subAuthorityOwner = msg.Owner
+	}
+
+	sdkErr := k.createAuthority(ctx, name, subAuthorityOwner, false)
+	if sdkErr != nil {
+		return sdkErr
+	}
+
+	return nil
+}
+
 func (k Keeper) createAuthority(ctx sdk.Context, name string, owner string, isRoot bool) error {
 	moduleParams, err := k.GetParams(ctx)
 	if err != nil {