allow empty auth definitions in parser

fixes #110

Signed-off-by: spolti <[email protected]>

Author: spolti

model/auth.go

@@ -19,7 +19,8 @@ import (
 	"fmt"
 	"reflect"
 
-	validator "github.com/go-playground/validator/v10"
+	"github.com/go-playground/validator/v10"
+
 	val "github.com/serverlessworkflow/sdk-go/v2/validator"
 )
 
@@ -43,7 +44,7 @@ func AuthDefinitionsStructLevelValidation(structLevel validator.StructLevel) {
 
 // AuthDefinitions used to define authentication information applied to resources defined in the operation property of function definitions
 type AuthDefinitions struct {
-	Defs []Auth
+	Defs []Auth `json:"defs,omitempty"`
 }
 
 // AuthType ...
@@ -105,9 +106,12 @@ func (a *AuthDefinitions) UnmarshalJSON(b []byte) error {
 		return a.unmarshalFile(b)
 	case '[':
 		return a.unmarshalMany(b)
+	case '{': // single values are not supported, should we support it?
+		return fmt.Errorf("authDefinitions value '%s' is not supported, it must be an object or string", string(b))
+	default:
+		// nil can be returned as both cases are returning errors in case of unmarshal problem.
+		return nil
 	}
-
-	return fmt.Errorf("auth value '%s' is not supported, it must be an array or string", string(b))
 }
 
 func (a *AuthDefinitions) unmarshalFile(data []byte) error {

model/auth_test.go

@@ -31,11 +31,9 @@ func TestAuthDefinitionsStructLevelValidation(t *testing.T) {
 	}
 	testCases := []testCase{
 		{
-			desp: "nil defs",
-			authDefs: AuthDefinitions{
-				Defs: nil,
-			},
-			err: ``,
+			desp:     "nil defs",
+			authDefs: AuthDefinitions{},
+			err:      ``,
 		},
 		{
 			desp: "zero length defs",

model/workflow.go

@@ -108,7 +108,7 @@ type BaseWorkflow struct {
 	// Auth definitions can be used to define authentication information that should be applied to resources defined in the operation
 	// property of function definitions. It is not used as authentication information for the function invocation,
 	// but just to access the resource containing the function invocation information.
-	Auth AuthDefinitions `json:"auth,omitempty"`
+	Auth *AuthDefinitions `json:"auth,omitempty"`
 }
 
 // Workflow base definition