dbeaver/pro#7990 feat: replace postForBlob with submitForm for form submissions

Co-authored-by: Copilot <copilot@github.com>

Author: SychevAndrey

webapp/packages/core-utils/src/index.ts

@@ -89,4 +89,4 @@ export * from './bindFunctions.js';
 export * from './isNumber.js';
 export * from './getSubjectDifferences.js';
 export * from './downloadImage.js';
-export * from './postForBlob.js';
+export * from './submitForm.js';

webapp/packages/core-utils/src/postForBlob.ts

@@ -0,0 +1,61 @@
+/*
+ * CloudBeaver - Cloud Database Manager
+ * Copyright (C) 2020-2026 DBeaver Corp and others
+ *
+ * Licensed under the Apache License, Version 2.0.
+ * you may not use this file except in compliance with the License.
+ */
+
+export function submitForm(url: string, fields: Iterable<readonly [string, string]>): void {
+  const form = document.createElement('form');
+  form.method = 'POST';
+  form.action = url;
+  form.target = '_blank';
+  form.style.display = 'none';
+
+  for (const [name, value] of fields) {
+    const input = document.createElement('input');
+    input.type = 'hidden';
+    input.name = name;
+    input.value = value;
+    form.appendChild(input);
+  }
+
+  document.body.appendChild(form);
+  form.submit();
+  document.body.removeChild(form);
+}
+
+/**
+ * Flattens an object into form-encoded key/value pairs, skipping falsy values:
+ * - arrays become repeated fields (`key=v1&key=v2`)
+ * - nested objects are flattened — their inner keys become top-level fields (!collision of inner keys is not handled)
+ */
+export function objectToFormFields(obj: Record<string, unknown>): Array<[string, string]> {
+  const fields: Array<[string, string]> = [];
+  for (const [key, value] of Object.entries(obj)) {
+    appendField(fields, key, value);
+  }
+  return fields;
+}
+
+function appendField(fields: Array<[string, string]>, key: string, value: unknown): void {
+  if (value == null || value === '') {
+    return;
+  }
+  if (Array.isArray(value)) {
+    for (const item of value) {
+      if (item != null && item !== '') {
+        fields.push([key, String(item)]);
+      }
+    }
+    return;
+  }
+  if (typeof value === 'object') {
+    for (const [innerKey, innerValue] of Object.entries(value)) {
+      appendField(fields, innerKey, innerValue);
+    }
+    return;
+  }
+  fields.push([key, String(value)]);
+}