fix: throw meaningful error when backup on invalid URL

Fixed issue ArcadeData#3716

Author: lvca

integration/src/main/java/com/arcadedb/integration/backup/BackupSettings.java

@@ -46,6 +46,10 @@ public void validateSettings() {
     if (format == null)
       throw new IllegalArgumentException("Missing backup format");
 
+    if (file != null && (file.startsWith("http://") || file.startsWith("https://") || file.startsWith("classpath://")))
+      throw new IllegalArgumentException(
+          "Backup to remote URLs is not supported. Only local file paths and 'file://' URLs are allowed");
+
     if (directory != null && file != null) {
       final String f = file.startsWith("file://") ? file.substring("file://".length()) : file;
       if (f.contains("..") || f.contains(File.separator))

integration/src/test/java/com/arcadedb/integration/backup/BackupDatabaseTest.java

@@ -28,6 +28,7 @@
 import java.nio.file.Path;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 class BackupDatabaseTest extends TestHelper {
 
@@ -45,6 +46,22 @@ void backup() {
     assertThat(result.<String>getProperty("backupFile")).isEqualTo("file://test-backup.zip");
   }
 
+  @Test
+  void backupWithHttpUrlShouldFail() {
+    assertThatThrownBy(() -> database.command("sql", "backup database http://example.com/backup.zip"))
+        .rootCause()
+        .isInstanceOf(IllegalArgumentException.class)
+        .hasMessageContaining("not supported");
+  }
+
+  @Test
+  void backupWithHttpsUrlShouldFail() {
+    assertThatThrownBy(() -> database.command("sql", "backup database https://example.com/backup.zip"))
+        .rootCause()
+        .isInstanceOf(IllegalArgumentException.class)
+        .hasMessageContaining("not supported");
+  }
+
   @Test
   void backupEncryption() {
     ResultSet resultSet = database.command("sql", "backup database file://test-backup.zip with encryptionKey = 'SuperSecretKey'");