44da954565
To make the definition of supported digests more clear, we have refactored the digest package to have a special Algorithm type. This represents the digest's prefix and we associated various supported hash implementations through function calls. Signed-off-by: Stephen J Day <stephen.day@docker.com>
112 lines
3.2 KiB
Go
112 lines
3.2 KiB
Go
package digest
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import (
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"bytes"
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"io"
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"testing"
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)
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func TestParseDigest(t *testing.T) {
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for _, testcase := range []struct {
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input string
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err error
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algorithm Algorithm
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hex string
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}{
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{
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input: "tarsum+sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
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algorithm: "tarsum+sha256",
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hex: "e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
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},
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{
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input: "tarsum.dev+sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
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algorithm: "tarsum.dev+sha256",
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hex: "e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
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},
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{
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input: "tarsum.v1+sha256:220a60ecd4a3c32c282622a625a54db9ba0ff55b5ba9c29c7064a2bc358b6a3e",
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algorithm: "tarsum.v1+sha256",
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hex: "220a60ecd4a3c32c282622a625a54db9ba0ff55b5ba9c29c7064a2bc358b6a3e",
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},
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{
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input: "sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
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algorithm: "sha256",
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hex: "e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
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},
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{
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input: "sha384:d3fc7881460b7e22e3d172954463dddd7866d17597e7248453c48b3e9d26d9596bf9c4a9cf8072c9d5bad76e19af801d",
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algorithm: "sha384",
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hex: "d3fc7881460b7e22e3d172954463dddd7866d17597e7248453c48b3e9d26d9596bf9c4a9cf8072c9d5bad76e19af801d",
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},
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{
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// empty hex
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input: "sha256:",
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err: ErrDigestInvalidFormat,
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},
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{
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// just hex
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input: "d41d8cd98f00b204e9800998ecf8427e",
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err: ErrDigestInvalidFormat,
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},
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{
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// not hex
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input: "sha256:d41d8cd98f00b204e9800m98ecf8427e",
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err: ErrDigestInvalidFormat,
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},
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{
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input: "foo:d41d8cd98f00b204e9800998ecf8427e",
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err: ErrDigestUnsupported,
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},
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} {
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digest, err := ParseDigest(testcase.input)
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if err != testcase.err {
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t.Fatalf("error differed from expected while parsing %q: %v != %v", testcase.input, err, testcase.err)
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}
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if testcase.err != nil {
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continue
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}
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if digest.Algorithm() != testcase.algorithm {
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t.Fatalf("incorrect algorithm for parsed digest: %q != %q", digest.Algorithm(), testcase.algorithm)
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}
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if digest.Hex() != testcase.hex {
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t.Fatalf("incorrect hex for parsed digest: %q != %q", digest.Hex(), testcase.hex)
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}
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// Parse string return value and check equality
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newParsed, err := ParseDigest(digest.String())
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if err != nil {
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t.Fatalf("unexpected error parsing input %q: %v", testcase.input, err)
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}
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if newParsed != digest {
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t.Fatalf("expected equal: %q != %q", newParsed, digest)
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}
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}
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}
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// A few test cases used to fix behavior we expect in storage backend.
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func TestFromTarArchiveZeroLength(t *testing.T) {
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checkTarsumDigest(t, "zero-length archive", bytes.NewReader([]byte{}), DigestTarSumV1EmptyTar)
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}
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func TestFromTarArchiveEmptyTar(t *testing.T) {
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// String of 1024 zeros is a valid, empty tar file.
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checkTarsumDigest(t, "1024 zero bytes", bytes.NewReader(bytes.Repeat([]byte("\x00"), 1024)), DigestTarSumV1EmptyTar)
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}
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func checkTarsumDigest(t *testing.T, msg string, rd io.Reader, expected Digest) {
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dgst, err := FromTarArchive(rd)
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if err != nil {
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t.Fatalf("unexpected error digesting %s: %v", msg, err)
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}
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if dgst != expected {
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t.Fatalf("unexpected digest for %s: %q != %q", msg, dgst, expected)
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}
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}
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