feat: allow localhost as a valid host in URL validation (#785)

Author: marwan562

pkg/utils/helper.go

@@ -196,6 +196,10 @@ func ValidateURL(rawURL string) error {
 		return nil
 	}
 
+	if host == "localhost" {
+		return nil
+	}
+
 	if !domainNameRegex.MatchString(host) {
 		return fmt.Errorf("invalid host: must be a valid IP address or domain name")
 	}

pkg/utils/helper_test.go

@@ -143,6 +143,10 @@ func TestValidateURL(t *testing.T) {
 		{"valid IPv4", "http://192.168.1.1", false},
 		{"valid IPv4 with port", "http://192.168.1.1:8080", false},
 		{"valid IPv6", "http://[::1]", false},
+		{"valid localhost http", "http://localhost", false},
+		{"valid localhost https", "https://localhost", false},
+		{"valid localhost http with port", "http://localhost:8080", false},
+		{"valid localhost https with port", "https://localhost:8443", false},
 
 		// invalid URLs
 		{"empty string", "", true},