Add support for empty input lists

fn.go

@@ -497,7 +497,7 @@ func (g *GraphQuery) graphQuery(ctx context.Context, azureCreds map[string]strin
 
 // validateUsers validates if the provided user principal names (emails) exist
 func (g *GraphQuery) validateUsers(ctx context.Context, client *msgraphsdk.GraphServiceClient, in *v1beta1.Input) (interface{}, error) {
-	if len(in.Users) == 0 {
+	if in.FailOnEmpty != nil && *in.FailOnEmpty && len(in.Users) == 0 {
 		return nil, errors.New("no users provided for validation")
 	}
 
@@ -754,7 +754,7 @@ func (g *GraphQuery) getGroupMembers(ctx context.Context, client *msgraphsdk.Gra
 
 // getGroupObjectIDs retrieves object IDs for the specified group names
 func (g *GraphQuery) getGroupObjectIDs(ctx context.Context, client *msgraphsdk.GraphServiceClient, in *v1beta1.Input) (interface{}, error) {
-	if len(in.Groups) == 0 {
+	if in.FailOnEmpty != nil && *in.FailOnEmpty && len(in.Groups) == 0 {
 		return nil, errors.New("no group names provided")
 	}
 
@@ -799,7 +799,7 @@ func (g *GraphQuery) getGroupObjectIDs(ctx context.Context, client *msgraphsdk.G
 
 // getServicePrincipalDetails retrieves details about service principals by name
 func (g *GraphQuery) getServicePrincipalDetails(ctx context.Context, client *msgraphsdk.GraphServiceClient, in *v1beta1.Input) (interface{}, error) {
-	if len(in.ServicePrincipals) == 0 {
+	if in.FailOnEmpty != nil && *in.FailOnEmpty && len(in.ServicePrincipals) == 0 {
 		return nil, errors.New("no service principal names provided")
 	}
 
@@ -1515,10 +1515,8 @@ func (f *Function) extractStringArrayFromMap(dataMap map[string]interface{}, fie
 				result = append(result, &strCopy)
 			}
 		}
-		if len(result) > 0 {
-			return result, nil
-		}
+		return result, nil
 	}
 
-	return nil, errors.Errorf("cannot resolve groupsRef: %s not a string array or empty", refKey)
+	return nil, errors.Errorf("cannot resolve groupsRef: %s not a string array", refKey)
 }

input/v1beta1/input.go

@@ -67,6 +67,12 @@ type Input struct {
 	// +optional
 	SkipQueryWhenTargetHasData *bool `json:"skipQueryWhenTargetHasData,omitempty"`
 
+	// FailOnEmpty controls whether the function should fail when input lists are empty.
+	// If true, the function will error on empty input lists.
+	// If false or unset, empty lists are valid and will result in a no-op.
+	// +optional
+	FailOnEmpty *bool `json:"failOnEmpty,omitempty"`
+
 	// Identity defines the type of identity used for authentication to the Microsoft Graph API.
 	Identity *Identity `json:"identity,omitempty"`
 }