fix: support of vp referencing in descriptor_map's path.

Signed-off-by: Volodymyr Kubiv <[email protected]>

pkg/doc/presexch/api.go

@@ -156,28 +156,29 @@ func selectVC(typelessVerifiable interface{},
 	var err error
 
 	for {
-		vc, err = selectByPath(builder, typelessVerifiable, mapping.Path, opts)
+		typelessVerifiable, err = selectByPath(builder, typelessVerifiable, mapping.Path)
 		if err != nil {
 			return nil, fmt.Errorf("failed to select vc from submission: %w", err)
 		}
 
-		if mapping.PathNested == nil {
-			break
+		if mapping.PathNested != nil {
+			mapping = mapping.PathNested
+			continue
 		}
 
-		mapping = mapping.PathNested
+		var credBits []byte
 
-		var vcBytes []byte
-
-		vcBytes, err = vc.MarshalJSON()
+		credBits, err = json.Marshal(typelessVerifiable)
 		if err != nil {
-			return nil, fmt.Errorf("failed to marshal vc: %w", err)
+			return nil, fmt.Errorf("failed to marshal credential: %w", err)
 		}
 
-		err = json.Unmarshal(vcBytes, &typelessVerifiable)
+		vc, err = verifiable.ParseCredential(credBits, opts.CredentialOptions...)
 		if err != nil {
-			return nil, fmt.Errorf("failed to unmarshal vc: %w", err)
+			return nil, fmt.Errorf("failed to parse credential: %w", err)
 		}
+
+		break
 	}
 
 	return vc, nil
@@ -263,8 +264,7 @@ func descriptorIDs(input []*InputDescriptor) []string {
 // [The Input Descriptor Mapping Object] MUST include a path property, and its value MUST be a JSONPath
 // string expression that selects the credential to be submit in relation to the identified Input Descriptor
 // identified, when executed against the top-level of the object the Presentation Submission is embedded within.
-func selectByPath(builder gval.Language, vp interface{}, jsonPath string,
-	options *MatchOptions) (*verifiable.Credential, error) {
+func selectByPath(builder gval.Language, vp interface{}, jsonPath string) (interface{}, error) {
 	path, err := builder.NewEvaluable(jsonPath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to build new json path evaluator: %w", err)
@@ -275,17 +275,7 @@ func selectByPath(builder gval.Language, vp interface{}, jsonPath string,
 		return nil, fmt.Errorf("failed to evaluate json path [%s]: %w", jsonPath, err)
 	}
 
-	credBits, err := json.Marshal(cred)
-	if err != nil {
-		return nil, fmt.Errorf("failed to marshal credential: %w", err)
-	}
-
-	vc, err := verifiable.ParseCredential(credBits, options.CredentialOptions...)
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse credential: %w", err)
-	}
-
-	return vc, nil
+	return cred, nil
 }
 
 func stringsContain(s []string, val string) bool {

pkg/doc/presexch/api_test.go

@@ -17,6 +17,7 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/hyperledger/aries-framework-go/component/storageutil/mem"
+
 	"github.com/hyperledger/aries-framework-go/pkg/doc/ldcontext"
 	. "github.com/hyperledger/aries-framework-go/pkg/doc/presexch"
 	jsonldsig "github.com/hyperledger/aries-framework-go/pkg/doc/signature/jsonld"
@@ -153,6 +154,45 @@ func TestPresentationDefinition_Match(t *testing.T) {
 		require.Equal(t, expectedNested.ID, result.ID)
 	})
 
+	t.Run("match with self referencing", func(t *testing.T) {
+		uri := randomURI()
+		contextLoader := createTestDocumentLoader(t, uri)
+		agent := newAgent(t)
+
+		expected := newSignedJWTVC(t, agent, []string{uri})
+
+		defs := &PresentationDefinition{
+			InputDescriptors: []*InputDescriptor{{
+				ID: uuid.New().String(),
+				Schema: []*Schema{{
+					URI: fmt.Sprintf("%s#%s", verifiable.ContextID, verifiable.VCType),
+				}},
+			}},
+		}
+
+		matched, err := defs.Match(newVP(t,
+			&PresentationSubmission{DescriptorMap: []*InputDescriptorMapping{{
+				ID:   defs.InputDescriptors[0].ID,
+				Path: "$",
+				PathNested: &InputDescriptorMapping{
+					ID:   defs.InputDescriptors[0].ID,
+					Path: "$.verifiableCredential[0]",
+				},
+			}}},
+			expected,
+		), contextLoader,
+			WithCredentialOptions(
+				verifiable.WithJSONLDDocumentLoader(contextLoader),
+				verifiable.WithPublicKeyFetcher(verifiable.NewVDRKeyResolver(agent.VDRegistry()).PublicKeyFetcher()),
+			),
+		)
+		require.NoError(t, err)
+		require.Len(t, matched, 1)
+		result, ok := matched[defs.InputDescriptors[0].ID]
+		require.True(t, ok)
+		require.Equal(t, expected.ID, result.ID)
+	})
+
 	t.Run("match one signed credential", func(t *testing.T) {
 		uri := randomURI()
 		contextLoader := createTestDocumentLoader(t, uri)