Added secondary parsing if the initial base path parsing fails; the s…

…econd attempt tries to remove the host

paths/paths.go

@@ -200,7 +200,21 @@ func getBasePaths(document *v3.Document) []string {
 	// extract base path from document to check against paths.
 	var basePaths []string
 	for _, s := range document.Servers {
-		u, _ := url.Parse(s.URL)
+		var u *url.URL = nil
+		u, err := url.Parse(s.URL)
+
+		// if the host contains special characters, we should attempt to split and parse only the relative path
+		if err != nil {
+			// split at first occurrence
+			_, serverPath, _ := strings.Cut(strings.Replace(s.URL, "//", "", 1), "/")
+
+			if !strings.HasPrefix(serverPath, "/") {
+				serverPath = "/" + serverPath
+			}
+
+			u, _ = url.Parse(serverPath)
+		}
+
 		if u != nil && u.Path != "" {
 			basePaths = append(basePaths, u.Path)
 		}

paths/paths_test.go

@@ -659,3 +659,41 @@ paths:
 	assert.Equal(t, "GET Path '/not_here' not found", errs[0].Message)
 
 }
+
+func TestGetBasePaths(t *testing.T) {
+	spec := `openapi: 3.1.0
+servers:
+  - url: 'https://things.com/'
+  - url: 'https://things.com/some/path'
+  - url: 'https://things.com/more//paths//please'
+  - url: 'https://{invalid}.com/'
+  - url: 'https://{invalid}.com/some/path'
+  - url: 'https://{invalid}.com/more//paths//please'
+  - url: 'https://{invalid}.com//even//more//paths//please'
+paths:
+  /dishy:
+    get:
+      operationId: one
+`
+
+	doc, err := libopenapi.NewDocument([]byte(spec))
+	if err != nil {
+		t.Fatal(err)
+	}
+	m, _ := doc.BuildV3Model()
+
+	basePaths := getBasePaths(&m.Model)
+
+	expectedPaths := []string{
+		"/",
+		"/some/path",
+		"/more//paths//please",
+		"/",
+		"/some/path",
+		"/more//paths//please",
+		"/even//more//paths//please",
+	}
+
+	assert.Equal(t, expectedPaths, basePaths)
+
+}