Feature: decode namespace id

cmd/api/handler/responses/namespace.go

@@ -21,6 +21,7 @@ type Namespace struct {
 	PfbCount        int64          `example:"12"                                                       format:"integer"   json:"pfb_count"         swaggertype:"integer"`
 	LastHeight      pkgTypes.Level `example:"100"                                                      format:"int64"     json:"last_height"       swaggertype:"integer"`
 	LastMessageTime time.Time      `example:"2023-07-04T03:10:57+00:00"                                format:"date-time" json:"last_message_time" swaggertype:"string"`
+	Name            string         `example:"name"                                                     format:"string"    json:"name"              swaggertype:"string"`
 	Reserved        bool           `example:"true"                                                     json:"reserved"`
 }
 
@@ -30,6 +31,7 @@ func NewNamespace(ns storage.Namespace) Namespace {
 		Size:            ns.Size,
 		Version:         ns.Version,
 		NamespaceID:     hex.EncodeToString(ns.NamespaceID),
+		Name:            decodeName(ns.NamespaceID),
 		Hash:            ns.Hash(),
 		Reserved:        ns.Reserved,
 		PfbCount:        ns.PfbCount,
@@ -41,3 +43,22 @@ func NewNamespace(ns storage.Namespace) Namespace {
 func (Namespace) SearchType() string {
 	return "namespace"
 }
+
+func decodeName(nsId []byte) string {
+	isDecodable := true
+	data := make([]byte, 0)
+	for i := range nsId {
+		if nsId[i] == 0 {
+			continue
+		}
+		if nsId[i] < 0x20 || nsId[i] > 0x7f {
+			isDecodable = false
+		}
+		data = append(data, nsId[i])
+	}
+
+	if isDecodable {
+		return string(data)
+	}
+	return hex.EncodeToString(data)
+}

cmd/api/handler/responses/namespace_test.go

@@ -0,0 +1,42 @@
+// SPDX-FileCopyrightText: 2023 PK Lab AG <[email protected]>
+// SPDX-License-Identifier: MIT
+
+package responses
+
+import (
+	"encoding/hex"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func Test_decodeName(t *testing.T) {
+	tests := []struct {
+		name string
+		nsId string
+		want string
+	}{
+		{
+			name: "test 1",
+			nsId: "6d656d6573",
+			want: "memes",
+		}, {
+			name: "test 2",
+			nsId: "0000000000000000000000000000006d656d6573",
+			want: "memes",
+		}, {
+			name: "test 3",
+			nsId: "0000000000000000000000000000000000000000e6edd3ffbef8c7d8",
+			want: "e6edd3ffbef8c7d8",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			decoded, err := hex.DecodeString(tt.nsId)
+			require.NoError(t, err)
+
+			got := decodeName(decoded)
+			require.Equal(t, tt.want, got)
+		})
+	}
+}