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package manifest
import (
"fmt"
"os"
"path/filepath"
"testing"
"github.com/containers/image/v5/pkg/compression"
digest "github.com/opencontainers/go-digest"
imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
const (
digestSha256EmptyTar = "sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
)
func TestGuessMIMEType(t *testing.T) {
cases := []struct {
path string
mimeType string
}{
{"v2s2.manifest.json", DockerV2Schema2MediaType},
{"v2list.manifest.json", DockerV2ListMediaType},
{"v2s1.manifest.json", DockerV2Schema1SignedMediaType},
{"v2s1-unsigned.manifest.json", DockerV2Schema1MediaType},
{"v2s1-invalid-signatures.manifest.json", DockerV2Schema1SignedMediaType},
{"v2s2nomime.manifest.json", DockerV2Schema2MediaType}, // It is unclear whether this one is legal, but we should guess v2s2 if anything at all.
{"unknown-version.manifest.json", ""},
{"non-json.manifest.json", ""}, // Not a manifest (nor JSON) at all
{"ociv1.manifest.json", imgspecv1.MediaTypeImageManifest},
{"ociv1.artifact.json", imgspecv1.MediaTypeImageManifest},
{"ociv1.image.index.json", imgspecv1.MediaTypeImageIndex},
{"ociv1nomime.manifest.json", imgspecv1.MediaTypeImageManifest},
{"ociv1nomime.artifact.json", imgspecv1.MediaTypeImageManifest},
{"ociv1nomime.image.index.json", imgspecv1.MediaTypeImageIndex},
}
for _, c := range cases {
manifest, err := os.ReadFile(filepath.Join("testdata", c.path))
require.NoError(t, err)
mimeType := GuessMIMEType(manifest)
assert.Equal(t, c.mimeType, mimeType, c.path)
}
}
func TestDigest(t *testing.T) {
cases := []struct {
path string
expectedDigest digest.Digest
}{
{"v2s2.manifest.json", TestDockerV2S2ManifestDigest},
{"v2s1.manifest.json", TestDockerV2S1ManifestDigest},
{"v2s1-unsigned.manifest.json", TestDockerV2S1UnsignedManifestDigest},
}
for _, c := range cases {
manifest, err := os.ReadFile(filepath.Join("testdata", c.path))
require.NoError(t, err)
actualDigest, err := Digest(manifest)
require.NoError(t, err)
assert.Equal(t, c.expectedDigest, actualDigest)
}
manifest, err := os.ReadFile("testdata/v2s1-invalid-signatures.manifest.json")
require.NoError(t, err)
_, err = Digest(manifest)
assert.Error(t, err)
actualDigest, err := Digest([]byte{})
require.NoError(t, err)
assert.Equal(t, digest.Digest(digestSha256EmptyTar), actualDigest)
}
func TestMatchesDigest(t *testing.T) {
cases := []struct {
path string
expectedDigest digest.Digest
result bool
}{
// Success
{"v2s2.manifest.json", TestDockerV2S2ManifestDigest, true},
{"v2s1.manifest.json", TestDockerV2S1ManifestDigest, true},
// No match (switched s1/s2)
{"v2s2.manifest.json", TestDockerV2S1ManifestDigest, false},
{"v2s1.manifest.json", TestDockerV2S2ManifestDigest, false},
// Unrecognized algorithm
{"v2s2.manifest.json", digest.Digest("md5:2872f31c5c1f62a694fbd20c1e85257c"), false},
// Mangled format
{"v2s2.manifest.json", digest.Digest(TestDockerV2S2ManifestDigest.String() + "abc"), false},
{"v2s2.manifest.json", digest.Digest(TestDockerV2S2ManifestDigest.String()[:20]), false},
{"v2s2.manifest.json", digest.Digest(""), false},
}
for _, c := range cases {
manifest, err := os.ReadFile(filepath.Join("testdata", c.path))
require.NoError(t, err)
res, err := MatchesDigest(manifest, c.expectedDigest)
require.NoError(t, err)
assert.Equal(t, c.result, res)
}
manifest, err := os.ReadFile("testdata/v2s1-invalid-signatures.manifest.json")
require.NoError(t, err)
// Even a correct SHA256 hash is rejected if we can't strip the JSON signature.
res, err := MatchesDigest(manifest, digest.FromBytes(manifest))
assert.False(t, res)
assert.Error(t, err)
res, err = MatchesDigest([]byte{}, digest.Digest(digestSha256EmptyTar))
assert.True(t, res)
assert.NoError(t, err)
}
func TestNormalizedMIMEType(t *testing.T) {
for _, c := range []string{ // Valid MIME types, normalized to themselves
DockerV2Schema1MediaType,
DockerV2Schema1SignedMediaType,
DockerV2Schema2MediaType,
DockerV2ListMediaType,
imgspecv1.MediaTypeImageManifest,
imgspecv1.MediaTypeImageIndex,
} {
res := NormalizedMIMEType(c)
assert.Equal(t, c, res, c)
}
for _, c := range []string{
"application/json",
"text/plain",
"not at all a valid MIME type",
"",
} {
res := NormalizedMIMEType(c)
assert.Equal(t, DockerV2Schema1SignedMediaType, res, c)
}
}
func TestCompressionAlgorithmIsUniversallySupported(t *testing.T) {
for _, algo := range []compression.Algorithm{compression.Gzip} {
res := CompressionAlgorithmIsUniversallySupported(algo)
assert.True(t, res, algo.Name())
}
for _, algo := range []compression.Algorithm{
compression.Bzip2,
compression.Xz,
compression.Zstd,
compression.ZstdChunked,
} {
res := CompressionAlgorithmIsUniversallySupported(algo)
assert.False(t, res, algo.Name())
}
}
func TestMIMETypeSupportsCompressionAlgorithm(t *testing.T) {
allMIMETypes := []string{imgspecv1.MediaTypeImageManifest, DockerV2Schema2MediaType, DockerV2Schema1SignedMediaType, DockerV2Schema1MediaType}
for _, algo := range []compression.Algorithm{compression.Gzip} {
for _, mt := range allMIMETypes {
res := MIMETypeSupportsCompressionAlgorithm(mt, algo)
assert.True(t, res, fmt.Sprintf("%s, %s", mt, algo.Name()))
}
}
for _, algo := range []compression.Algorithm{
compression.Bzip2,
compression.Xz,
} {
for _, mt := range allMIMETypes {
res := MIMETypeSupportsCompressionAlgorithm(mt, algo)
assert.False(t, res, fmt.Sprintf("%s, %s", mt, algo.Name()))
}
}
for _, algo := range []compression.Algorithm{
compression.Zstd,
compression.ZstdChunked,
} {
for _, mt := range allMIMETypes {
res := MIMETypeSupportsCompressionAlgorithm(mt, algo)
assert.Equal(t, mt == imgspecv1.MediaTypeImageManifest, res, fmt.Sprintf("%s, %s", mt, algo.Name()))
}
}
}
func TestCandidateCompressionMatchesReuseConditions(t *testing.T) {
cases := []struct {
requiredCompression *compression.Algorithm
possibleManifestFormats []string
candidateCompression *compression.Algorithm
result bool
}{
// RequiredCompression restrictions
{&compression.Zstd, nil, &compression.Zstd, true},
{&compression.Zstd, nil, &compression.ZstdChunked, true},
{&compression.ZstdChunked, nil, &compression.Zstd, false},
{&compression.ZstdChunked, nil, &compression.ZstdChunked, true},
{&compression.Gzip, nil, &compression.Zstd, false},
{&compression.Zstd, nil, nil, false},
{nil, nil, &compression.Zstd, true},
// PossibleManifestFormats restrictions
{nil, []string{imgspecv1.MediaTypeImageManifest}, &compression.Zstd, true},
{nil, []string{DockerV2Schema2MediaType}, &compression.Zstd, false},
{nil, []string{DockerV2Schema2MediaType, DockerV2Schema1SignedMediaType, imgspecv1.MediaTypeImageManifest}, &compression.Zstd, true},
{nil, nil, &compression.Zstd, true},
{nil, []string{imgspecv1.MediaTypeImageManifest}, &compression.Gzip, true},
{nil, []string{DockerV2Schema2MediaType}, &compression.Gzip, true},
{nil, []string{DockerV2Schema2MediaType, DockerV2Schema1SignedMediaType, imgspecv1.MediaTypeImageManifest}, &compression.Gzip, true},
{nil, nil, &compression.Gzip, true},
// Some possible combinations (always 1 constraint not matching)
{&compression.Zstd, []string{DockerV2Schema2MediaType}, &compression.Zstd, false},
{&compression.Gzip, []string{DockerV2Schema2MediaType, DockerV2Schema1SignedMediaType, imgspecv1.MediaTypeImageManifest}, &compression.Zstd, false},
}
for _, c := range cases {
conds := ReuseConditions{
RequiredCompression: c.requiredCompression,
PossibleManifestFormats: c.possibleManifestFormats,
}
assert.Equal(t, c.result, CandidateCompressionMatchesReuseConditions(conds, c.candidateCompression))
}
}
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