feat(explore): API methods for asking backend for explore page notes

Co-authored-by: Philip Molares <philip.molares@udo.edu>
Signed-off-by: Philip Molares <philip.molares@udo.edu>
Signed-off-by: Erik Michelson <github@erik.michelson.eu>

frontend/src/api/explore/utils.ts

@@ -0,0 +1,31 @@
+/*
+ * SPDX-FileCopyrightText: 2025 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import type { SortMode } from '../../components/explore-page/explore-notes-section/filters/sort-button'
+import type { NoteType } from '@hedgedoc/commons'
+
+/**
+ * Create the necessary url parameters for the api calls of the explore page.
+ * @param sort
+ * @param searchFilter
+ * @param typeFilter
+ * @return a string representation of the search parameter
+ */
+export const createURLSearchParams = (
+  sort: SortMode,
+  searchFilter: string | null,
+  typeFilter: NoteType | null
+): string => {
+  const params = new URLSearchParams()
+  params.set('sort', sort)
+  if (searchFilter) {
+    params.set('search', searchFilter)
+  }
+  if (typeFilter) {
+    params.set('type', typeFilter)
+  }
+  return params.toString()
+}