// buildDPNBag bags the DPNBag object that will eventually be entered into
// the DPN registry. This is not the bag itself, just the DPN registry entry.
func (packager *DPNPackager) buildDPNBag(manifest *models.DPNIngestManifest) {
packager.Context.MessageLog.Info("Building DPN bag record for %s",
manifest.IntellectualObject.Identifier)
depositingInstitution := packager.getInstitution(manifest)
if depositingInstitution == nil {
return
}
manifest.DPNBag = models.NewDPNBag(
manifest.IntellectualObject.Identifier,
depositingInstitution.DPNUUID,
packager.Context.Config.DPN.LocalNode)
// Calculate the sha256 digest of the tag manifest. This is used for
// validating bag transfers in DPN. Note that we are NOT using a
// nonce when we call shaHash.Sum(nil). Though the DPN spec allows
// us to use a nonce, no nodes are using nonces as of late 2016.
tagManifestFile := filepath.Join(manifest.LocalDir, "tagmanifest-sha256.txt")
if !fileutil.FileExists(tagManifestFile) {
manifest.PackageSummary.AddError("Cannot find tag manifest %s", tagManifestFile)
return
}
reader, err := os.Open(tagManifestFile)
if err != nil {
manifest.PackageSummary.AddError("Cannot read tag manifest at %s: %v",
tagManifestFile, err)
return
}
defer reader.Close()
shaHash := sha256.New()
io.Copy(shaHash, reader)
tagManifestDigest := fmt.Sprintf("%x", shaHash.Sum(nil))
// Now create the MessageDigest for this bag, with the tag manifest
// checksum that will be used to verify transfers. When a remote
// node copies this bag to fulfill a replication request, we expect
// the node to return this fixity value as proof that it received
// a valid copy of the bag.
digest := &models.MessageDigest{
Bag: manifest.DPNBag.UUID,
Algorithm: constants.AlgSha256,
Node: packager.Context.Config.DPN.LocalNode,
Value: tagManifestDigest,
CreatedAt: time.Now().UTC(),
}
manifest.DPNBag.MessageDigests = append(manifest.DPNBag.MessageDigests, digest)
// Now that we have a valid DPN bag object, we can name the tar file.
// According to the DPN spec, the tar file name should be the bag's
// UUID plus a ".tar" extension.
parentOfBagDir := filepath.Dir(manifest.LocalDir)
manifest.LocalTarFile = filepath.Join(parentOfBagDir, manifest.DPNBag.UUID+".tar")
}
func TestNewDPNBag(t *testing.T) {
bag := models.NewDPNBag("local_id", "some_member", "some_node")
assert.NotNil(t, bag)
assert.NotEmpty(t, bag.UUID)
assert.Equal(t, bag.UUID, bag.FirstVersionUUID)
assert.Equal(t, "local_id", bag.LocalId)
assert.Equal(t, "some_member", bag.Member)
assert.Equal(t, "some_node", bag.AdminNode)
assert.Equal(t, "some_node", bag.IngestNode)
assert.EqualValues(t, 1, bag.Version)
assert.Equal(t, "D", bag.BagType)
assert.NotNil(t, bag.MessageDigests)
assert.Empty(t, bag.MessageDigests)
assert.NotNil(t, bag.Interpretive)
assert.Empty(t, bag.Interpretive)
assert.NotNil(t, bag.Rights)
assert.Empty(t, bag.Rights)
assert.NotNil(t, bag.ReplicatingNodes)
assert.Empty(t, bag.ReplicatingNodes)
assert.False(t, bag.CreatedAt.IsZero())
assert.False(t, bag.UpdatedAt.IsZero())
}