add Rule.IsRewrite()

redirects.go

@@ -42,6 +42,11 @@ type Rule struct {
 	Params Params
 }
 
+// IsRewrite returns true if the rule represents a rewrite (status 200).
+func (r *Rule) IsRewrite() bool {
+	return r.Status == 200
+}
+
 // IsProxy returns true if it's a proxy rule (aka contains a hostname).
 func (r *Rule) IsProxy() bool {
 	u, err := url.Parse(r.To)

redirects_test.go

@@ -48,3 +48,34 @@ func TestRule_IsProxy(t *testing.T) {
 		assert.True(t, r.IsProxy())
 	})
 }
+
+func TestRule_IsRewrite(t *testing.T) {
+	t.Run("with 3xx", func(t *testing.T) {
+		r := redirects.Rule{
+			From:   "/blog",
+			To:     "/blog/engineering",
+			Status: 302,
+		}
+
+		assert.False(t, r.IsRewrite())
+	})
+
+	t.Run("with 200", func(t *testing.T) {
+		r := redirects.Rule{
+			From:   "/blog",
+			To:     "/blog/engineering",
+			Status: 200,
+		}
+
+		assert.True(t, r.IsRewrite())
+	})
+
+	t.Run("with 0", func(t *testing.T) {
+		r := redirects.Rule{
+			From: "/blog",
+			To:   "/blog/engineering",
+		}
+
+		assert.False(t, r.IsRewrite())
+	})
+}