chore: Service priority should be an interface

pkg/didcomm/protocol/outofband/service_test.go

@@ -1027,7 +1027,7 @@ func TestChooseTarget(t *testing.T) {
 		expected := map[string]interface{}{
 			"id":              uuid.New().String(),
 			"type":            "did-communication",
-			"priority":        uint(0),
+			"priority":        0,
 			"recipientKeys":   []string{"my ver key"},
 			"serviceEndpoint": commonmodel.NewDIDCommV1Endpoint("my service endpoint"),
 			"RoutingKeys":     []string{"my routing key"},

pkg/doc/did/doc.go

@@ -374,7 +374,7 @@ func (pk *VerificationMethod) JSONWebKey() *jwk.JWK {
 type Service struct {
 	ID                       string                 `json:"id"`
 	Type                     interface{}            `json:"type"`
-	Priority                 uint                   `json:"priority,omitempty"`
+	Priority                 interface{}            `json:"priority,omitempty"`
 	RecipientKeys            []string               `json:"recipientKeys,omitempty"`
 	RoutingKeys              []string               `json:"routingKeys,omitempty"`
 	ServiceEndpoint          model.Endpoint         `json:"serviceEndpoint"`
@@ -705,7 +705,7 @@ func populateServices(didID, baseURI string, rawServices []map[string]interface{
 			relativeURL:              isRelative,
 			ServiceEndpoint:          sp,
 			RecipientKeys:            recipientKeys,
-			Priority:                 uintEntry(rawService[jsonldPriority]),
+			Priority:                 rawService[jsonldPriority],
 			RoutingKeys:              routingKeys,
 			recipientKeysRelativeURL: recipientKeysRelativeURL,
 			routingKeysRelativeURL:   routingKeysRelativeURL,
@@ -1051,15 +1051,6 @@ func stringEntry(entry interface{}) string {
 	return ""
 }
 
-// uintEntry.
-func uintEntry(entry interface{}) uint {
-	if entry == nil {
-		return 0
-	}
-
-	return uint(entry.(float64))
-}
-
 // stringArray.
 func stringArray(entry interface{}) []string {
 	if entry == nil {
@@ -1411,7 +1402,9 @@ func populateRawServices(services []Service, didID, baseURI string) []map[string
 			rawService[jsonldServicePoint] = json.RawMessage(bytes)
 		}
 
-		rawService[jsonldPriority] = services[i].Priority
+		if services[i].Priority != nil {
+			rawService[jsonldPriority] = services[i].Priority
+		}
 
 		if len(recipientKeys) > 0 {
 			rawService[jsonldRecipientKeys] = recipientKeys

pkg/doc/did/doc_test.go

@@ -157,7 +157,7 @@ func TestValidWithDocBase(t *testing.T) {
 			{
 				ID:                       "did:example:123456789abcdefghi#did-communication",
 				Type:                     "did-communication",
-				Priority:                 0,
+				Priority:                 float64(0),
 				relativeURL:              true,
 				RecipientKeys:            []string{"did:example:123456789abcdefghi#key2"},
 				RoutingKeys:              []string{"did:example:123456789abcdefghi#key2"},
@@ -413,7 +413,7 @@ func TestValid(t *testing.T) {
 			{
 				ID:                       "did:example:123456789abcdefghi#did-communication",
 				Type:                     "did-communication",
-				Priority:                 0,
+				Priority:                 float64(0),
 				RecipientKeys:            []string{"did:example:123456789abcdefghi#key2"},
 				RoutingKeys:              []string{"did:example:123456789abcdefghi#key2"},
 				ServiceEndpoint:          model.NewDIDCommV1Endpoint("https://agent.example.com/"),
@@ -424,7 +424,7 @@ func TestValid(t *testing.T) {
 			{
 				ID:            "did:example:123456789abcdefghi#DIDCommMessaging",
 				Type:          "DIDCommMessaging",
-				Priority:      0,
+				Priority:      float64(0),
 				RecipientKeys: []string{"did:example:123456789abcdefghi#key2"},
 				ServiceEndpoint: model.NewDIDCommV2Endpoint([]model.DIDCommV2Endpoint{{
 					URI:         "https://agent.example.com/",

pkg/doc/did/helpers.go

@@ -138,7 +138,7 @@ func LookupService(didDoc *Doc, serviceType string) (*Service, bool) {
 
 	for i := range didDoc.Service {
 		if didDoc.Service[i].Type == serviceType {
-			if index == notFound || didDoc.Service[index].Priority > didDoc.Service[i].Priority {
+			if index == notFound || comparePriority(didDoc.Service[index].Priority, didDoc.Service[i].Priority) {
 				index = i
 			}
 		}
@@ -151,6 +151,22 @@ func LookupService(didDoc *Doc, serviceType string) (*Service, bool) {
 	return &didDoc.Service[index], true
 }
 
+func comparePriority(v1, v2 interface{}) bool {
+	// expecting positive integers plus zero; otherwise cannot compare priority
+	intV1, okV1 := v1.(int)
+	intV2, okV2 := v2.(int)
+
+	if okV1 && okV2 {
+		return intV1 > intV2
+	}
+
+	if !okV1 && !okV2 {
+		return false
+	}
+
+	return !okV1
+}
+
 // LookupDIDCommRecipientKeys gets the DIDComm recipient keys from the did doc which match the given parameters.
 // DIDComm recipient keys are encoded as did:key identifiers.
 // See:

pkg/doc/did/helpers_test.go

@@ -194,7 +194,54 @@ func TestGetDidCommService(t *testing.T) {
 		s, ok := LookupService(didDoc, didCommServiceType)
 		require.True(t, ok)
 		require.Equal(t, "did-communication", s.Type)
-		require.Equal(t, uint(0), s.Priority)
+		require.Equal(t, 0, s.Priority)
+	})
+
+	t.Run("successfully getting did-communication service - switch order", func(t *testing.T) {
+		didDoc := mockdiddoc.GetMockDIDDoc(t, false)
+		service := didDoc.Service[0]
+		didDoc.Service[0] = didDoc.Service[1]
+		didDoc.Service[1] = service
+
+		s, ok := LookupService(didDoc, didCommServiceType)
+		require.True(t, ok)
+		require.Equal(t, "did-communication", s.Type)
+		require.Equal(t, 0, s.Priority)
+	})
+
+	t.Run("successfully getting did-communication service - first priority nil", func(t *testing.T) {
+		didDoc := mockdiddoc.GetMockDIDDoc(t, false)
+		didDoc.Service[0].Priority = nil
+
+		s, ok := LookupService(didDoc, didCommServiceType)
+		require.True(t, ok)
+		require.Equal(t, "did-communication", s.Type)
+		require.Equal(t, 1, s.Priority)
+	})
+
+	t.Run("successfully getting did-communication service - second priority nil", func(t *testing.T) {
+		didDoc := mockdiddoc.GetMockDIDDoc(t, false)
+		didDoc.Service[1].Priority = nil
+
+		s, ok := LookupService(didDoc, didCommServiceType)
+		require.True(t, ok)
+		require.Equal(t, "did-communication", s.Type)
+		require.Equal(t, 0, s.Priority)
+	})
+
+	t.Run("successfully getting did-communication service - both nil", func(t *testing.T) {
+		didDoc := mockdiddoc.GetMockDIDDoc(t, false)
+		didDoc.Service[0].Priority = nil
+		didDoc.Service[1].Priority = nil
+
+		s, ok := LookupService(didDoc, didCommServiceType)
+		require.True(t, ok)
+		require.Equal(t, "did-communication", s.Type)
+		require.Equal(t, nil, s.Priority)
+
+		uri, err := s.ServiceEndpoint.URI()
+		require.NoError(t, err)
+		require.Equal(t, "https://localhost:8090", uri)
 	})
 
 	t.Run("error due to missing service", func(t *testing.T) {
@@ -209,6 +256,7 @@ func TestGetDidCommService(t *testing.T) {
 	t.Run("error due to missing did-communication service", func(t *testing.T) {
 		didDoc := mockdiddoc.GetMockDIDDoc(t, false)
 		didDoc.Service[0].Type = "some-type"
+		didDoc.Service[1].Type = "other-type"
 
 		s, ok := LookupService(didDoc, didCommServiceType)
 		require.False(t, ok)

pkg/doc/did/legacy.go

@@ -107,7 +107,10 @@ func populateRawServicesLegacy(services []Service, didID, baseURI string) []map[
 		rawService[jsonldServicePoint] = uri
 		rawService[jsonldRecipientKeys] = recipientKeys
 		rawService[jsonldRoutingKeys] = routingKeys
-		rawService[jsonldPriority] = services[i].Priority
+
+		if services[i].Priority != nil {
+			rawService[jsonldPriority] = services[i].Priority
+		}
 
 		rawServices = append(rawServices, rawService)
 	}

pkg/doc/did/serialize_interop.go

@@ -1,3 +1,4 @@
+//go:build ACAPyInterop
 // +build ACAPyInterop
 
 /*
@@ -119,7 +120,10 @@ func populateRawServicesInterop(services []Service, didID, baseURI string) []map
 		rawService[jsonldServicePoint] = uri
 		rawService[jsonldRecipientKeys] = recipientKeys
 		rawService[jsonldRoutingKeys] = routingKeys
-		rawService[jsonldPriority] = services[i].Priority
+
+		if services[i].Priority != nil {
+			rawService[jsonldPriority] = services[i].Priority
+		}
 
 		rawServices = append(rawServices, rawService)
 	}
@@ -159,9 +163,12 @@ func pubKeyFromDIDKey(didKey string) ([]byte, error) {
 
 // SerializeInterop serializes the DID doc, using normal serialization unless the `interop` build flag is set.
 // Verifications are serialized to accommodate aca-py issue #1104:
-//   https://github.com/hyperledger/aries-cloudagent-python/issues/1104
+//
+//	https://github.com/hyperledger/aries-cloudagent-python/issues/1104
+//
 // Services are serialized to accommodate aca-py issue #1106:
-//   https://github.com/hyperledger/aries-cloudagent-python/issues/1106
+//
+//	https://github.com/hyperledger/aries-cloudagent-python/issues/1106
 func (doc *Doc) SerializeInterop() ([]byte, error) {
 	context := ContextV1Old
 

pkg/mock/diddoc/mock_diddoc.go

@@ -20,6 +20,7 @@ import (
 )
 
 // GetMockDIDDoc creates a mock DID Doc for testing.
+//
 //nolint:funlen
 func GetMockDIDDoc(t *testing.T, isDIDCommV2 bool) *did.Doc {
 	t.Helper()
@@ -34,6 +35,13 @@ func GetMockDIDDoc(t *testing.T, isDIDCommV2 bool) *did.Doc {
 			Priority:        0,
 			RecipientKeys:   []string{MockDIDKey(t)},
 		},
+		{
+			ServiceEndpoint: model.NewDIDCommV1Endpoint("https://localhost:9090"),
+			RoutingKeys:     []string{MockDIDKey(t)},
+			Type:            "did-communication",
+			Priority:        1,
+			RecipientKeys:   []string{MockDIDKey(t)},
+		},
 	}
 
 	if isDIDCommV2 {