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// Copyright 2024 Google LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// package api_test contains tests for the api package.
package api_test
import (
"bytes"
"crypto/rand"
"crypto/sha256"
"fmt"
"strings"
"testing"
"github.com/google/go-cmp/cmp"
"github.com/transparency-dev/tessera"
"github.com/transparency-dev/tessera/api"
)
func TestHashTile_MarshalTileRoundtrip(t *testing.T) {
for _, test := range []struct {
size int
}{
{
size: 1,
}, {
size: 255,
}, {
size: 11,
}, {
size: 42,
},
} {
t.Run(fmt.Sprintf("tile size %d", test.size), func(t *testing.T) {
tile := api.HashTile{Nodes: make([][]byte, 0, test.size)}
for i := range test.size {
// Fill in the leaf index
tile.Nodes = append(tile.Nodes, make([]byte, sha256.Size))
if _, err := rand.Read(tile.Nodes[i]); err != nil {
t.Error(err)
}
}
raw, err := tile.MarshalText()
if err != nil {
t.Fatalf("MarshalText() = %v", err)
}
tile2 := api.HashTile{}
if err := tile2.UnmarshalText(raw); err != nil {
t.Fatalf("UnmarshalText() = %v", err)
}
if diff := cmp.Diff(tile, tile2); len(diff) != 0 {
t.Fatalf("Got tile with diff: %s", diff)
}
})
}
}
func TestLeafBundle_MarshalTileRoundtrip(t *testing.T) {
for _, test := range []struct {
size int
}{
{
size: 1,
}, {
size: 255,
}, {
size: 11,
}, {
size: 42,
},
} {
t.Run(fmt.Sprintf("tile size %d", test.size), func(t *testing.T) {
bundleRaw := &bytes.Buffer{}
want := make([][]byte, test.size)
for i := range test.size {
// Fill in the leaf index
want[i] = make([]byte, i*100)
if _, err := rand.Read(want[i]); err != nil {
t.Error(err)
}
_, _ = bundleRaw.Write(tessera.NewEntry(want[i]).MarshalBundleData(uint64(i)))
}
tile2 := api.EntryBundle{}
if err := tile2.UnmarshalText(bundleRaw.Bytes()); err != nil {
t.Fatalf("UnmarshalText() = %v", err)
}
for i := range test.size {
if got, want := tile2.Entries[i], want[i]; !bytes.Equal(got, want) {
t.Errorf("%d: want %x, got %x", i, got, want)
}
}
})
}
}
func TestLeafBundle_UnmarshalText(t *testing.T) {
for _, test := range []struct {
desc string
input []byte
wantErr bool
}{
{
desc: "no data",
input: []byte{},
wantErr: false,
},
{
desc: "insufficient data",
input: []byte{0x0, 0x02, 'a'},
wantErr: true,
},
{
desc: "empty nodes",
input: []byte{0x0, 0x0, 0x0, 0x1, 'a', 0x0, 0x0},
wantErr: false,
},
{
desc: "insufficient integer bytes",
input: []byte{0x1},
wantErr: true,
},
} {
t.Run(test.desc, func(t *testing.T) {
tile := api.EntryBundle{}
err := tile.UnmarshalText(test.input)
if gotErr := err != nil; gotErr != test.wantErr {
t.Errorf("wantErr: %t, got %v", test.wantErr, err)
}
})
}
}
func BenchmarkLeafBundle_UnmarshalText(b *testing.B) {
bs := bytes.Buffer{}
for i := range 222 {
// Create leaves of different lengths for interest in the parsing / memory allocation
leafStr := strings.Repeat(fmt.Sprintf("Leaf %d", i), i%20)
_, _ = bs.Write(tessera.NewEntry([]byte(leafStr)).MarshalBundleData(uint64(i)))
}
rawBundle := bs.Bytes()
for b.Loop() {
tile := api.EntryBundle{}
if err := tile.UnmarshalText(rawBundle); err != nil {
b.Fatal(err)
}
}
}
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