Initial commit

view/adminhtml/templates/system/config/test_connection.phtml

@@ -0,0 +1,35 @@
+<?php $url = $block->getCustomUrl(); ?>
+
+<script type="text/javascript">
+    require(["jquery"],function($) {
+        $('#whi_test_connection').click(function() {
+            if (!confirm('Save the configuration before testing.')) {
+                return; 
+            }
+
+            $.ajax({
+                url: "<?php echo $url; ?>",
+                type: 'GET',
+                complete: function (response) {
+                    switch (response.status) {
+                        case 204:
+                            alert('Connection successful.');
+                            break;
+
+                        case 401:
+                        case 403:
+                            alert('Invalid API key.');
+                            break;
+                        
+                        default:
+                            alert('Failed to connect to the provided URL.');
+                            break;
+                    }
+                }
+            });
+        });
+    });
+</script>
+
+<?php echo $block->getButtonHtml(); ?>
+<p><sub><em>Note: Currently only works in Chromium-based browsers (Firefox blocks script execution).</em></sub></p>