Fix openapi3.referencedDocumentPath (getkin#248)

openapi3/swagger_loader.go

@@ -876,16 +876,19 @@ func unescapeRefString(ref string) string {
 }
 
 func referencedDocumentPath(documentPath *url.URL, ref string) (*url.URL, error) {
-	newDocumentPath := documentPath
-	if documentPath != nil {
-		refDirectory, err := url.Parse(path.Dir(ref))
-		if err != nil {
-			return nil, err
-		}
-		joinedDirectory := path.Join(path.Dir(documentPath.String()), refDirectory.String())
-		if newDocumentPath, err = url.Parse(joinedDirectory + "/"); err != nil {
-			return nil, err
-		}
+	if documentPath == nil {
+		return nil, nil
+	}
+
+	newDocumentPath, err := copyURL(documentPath)
+	if err != nil {
+		return nil, err
 	}
+	refPath, err := url.Parse(ref)
+	if err != nil {
+		return nil, err
+	}
+	newDocumentPath.Path = path.Join(path.Dir(newDocumentPath.Path), path.Dir(refPath.Path)) + "/"
+
 	return newDocumentPath, nil
 }

openapi3/swagger_loader_referenced_document_path_test.go

@@ -0,0 +1,60 @@
+package openapi3
+
+import (
+	"net/url"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestReferencedDocumentPath(t *testing.T) {
+	httpURL, err := url.Parse("http://example.com/path/to/schemas/test1.yaml")
+	require.NoError(t, err)
+
+	fileURL, err := url.Parse("path/to/schemas/test1.yaml")
+	require.NoError(t, err)
+
+	refEmpty := ""
+	refNoComponent := "moreschemas/test2.yaml"
+	refWithComponent := "moreschemas/test2.yaml#/components/schemas/someobject"
+
+	for _, test := range []struct {
+		path          *url.URL
+		ref, expected string
+	}{
+		{
+			path:     httpURL,
+			ref:      refEmpty,
+			expected: "http://example.com/path/to/schemas/",
+		},
+		{
+			path:     httpURL,
+			ref:      refNoComponent,
+			expected: "http://example.com/path/to/schemas/moreschemas/",
+		},
+		{
+			path:     httpURL,
+			ref:      refWithComponent,
+			expected: "http://example.com/path/to/schemas/moreschemas/",
+		},
+		{
+			path:     fileURL,
+			ref:      refEmpty,
+			expected: "path/to/schemas/",
+		},
+		{
+			path:     fileURL,
+			ref:      refNoComponent,
+			expected: "path/to/schemas/moreschemas/",
+		},
+		{
+			path:     fileURL,
+			ref:      refWithComponent,
+			expected: "path/to/schemas/moreschemas/",
+		},
+	} {
+		result, err := referencedDocumentPath(test.path, test.ref)
+		require.NoError(t, err)
+		require.Equal(t, test.expected, result.String())
+	}
+}