From 47e95dc94d2fe84cd93b7b5c9d6b9542f7459ec7 Mon Sep 17 00:00:00 2001
From: Wondertan <hlibwondertan@gmail.com>
Date: Mon, 26 Jun 2023 14:04:02 +0200
Subject: [PATCH] blob and namesapce constructor to forbid empty data

---
 blob/blob.go            |  4 ++++
 share/namespace.go      |  5 +++--
 share/namespace_test.go | 12 +++++++++---
 3 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/blob/blob.go b/blob/blob.go
index 3652893e51..890601e1c8 100644
--- a/blob/blob.go
+++ b/blob/blob.go
@@ -3,6 +3,7 @@ package blob
 import (
 	"bytes"
 	"encoding/json"
+	"fmt"
 
 	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
 
@@ -116,6 +117,9 @@ func NewBlobV0(namespace share.Namespace, data []byte) (*Blob, error) {
 
 // NewBlob constructs a new blob from the provided Namespace, data and share version.
 func NewBlob(shareVersion uint8, namespace share.Namespace, data []byte) (*Blob, error) {
+	if len(data) == 0 || len(data) > appconsts.DefaultMaxBytes {
+		return nil, fmt.Errorf("blob data must be > 0 && <= %d, but it was %d bytes", appconsts.DefaultMaxBytes, len(data))
+	}
 	if err := namespace.ValidateBlobNamespace(); err != nil {
 		return nil, err
 	}
diff --git a/share/namespace.go b/share/namespace.go
index a4a2828b11..7d69bff8ff 100644
--- a/share/namespace.go
+++ b/share/namespace.go
@@ -30,8 +30,9 @@ type Namespace []byte
 // The byte slice must be <= 10 bytes.
 // If it is less than 10 bytes, it will be left padded to size 10 with 0s.
 func NewNamespaceV0(id []byte) (Namespace, error) {
-	if len(id) > appns.NamespaceVersionZeroIDSize {
-		return nil, fmt.Errorf("namespace id must be <= %v, but it was %v bytes", appns.NamespaceVersionZeroIDSize, len(id))
+	if len(id) == 0 || len(id) > appns.NamespaceVersionZeroIDSize {
+		return nil, fmt.Errorf(
+			"namespace id must be > 0 && <= %d, but it was %d bytes", appns.NamespaceVersionZeroIDSize, len(id))
 	}
 
 	n := make(Namespace, NamespaceSize)
diff --git a/share/namespace_test.go b/share/namespace_test.go
index 559babaafd..886161431e 100644
--- a/share/namespace_test.go
+++ b/share/namespace_test.go
@@ -28,7 +28,7 @@ func TestNewNamespaceV0(t *testing.T) {
 	}
 	testCases := []testCase{
 		{
-			name:   "8 byte subNid, gets left padded",
+			name:   "8 byte id, gets left padded",
 			subNid: []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08},
 			expected: Namespace{
 				0x0,
@@ -37,7 +37,7 @@ func TestNewNamespaceV0(t *testing.T) {
 			wantErr: false,
 		},
 		{
-			name:   "10 byte subNid, no padding",
+			name:   "10 byte id, no padding",
 			subNid: []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x9, 0x10},
 			expected: Namespace{
 				0x0,                                                                                      // version
@@ -46,11 +46,17 @@ func TestNewNamespaceV0(t *testing.T) {
 			wantErr: false,
 		},
 		{
-			name:     "11 byte subNid",
+			name:     "11 byte id",
 			subNid:   []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x9, 0x10, 0x11},
 			expected: []byte{},
 			wantErr:  true,
 		},
+		{
+			name:     "nil id",
+			subNid:   nil,
+			expected: []byte{},
+			wantErr:  true,
+		},
 	}
 
 	for _, tc := range testCases {