Add file upload and download (zip for directories)

Frontend/src/Api.js

@@ -156,6 +156,25 @@ export function GetRawFileUrl(RootName, RelativePath) {
   return `${ApiBase}/raw/${encodeURIComponent(RootName)}/${EncodedSegments.join("/")}`;
 }
 
+export function GetDownloadUrl(RootName, RelativePath) {
+  const Params = new URLSearchParams({ Root: RootName, Path: RelativePath });
+  return `${ApiBase}/download?${Params}`;
+}
+
+export async function UploadFiles(RootName, RelativePath, Files) {
+  const Form = new FormData();
+  for (const File of Files) {
+    Form.append("Files", File);
+  }
+  const Params = new URLSearchParams({ Root: RootName, Path: RelativePath });
+  const Response = await fetch(`${ApiBase}/upload?${Params}`, {
+    method: "POST",
+    credentials: "same-origin",
+    body: Form,
+  });
+  return ParseJsonOrThrow(Response);
+}
+
 export function SaveFile(RootName, RelativePath, Content) {
   const Params = new URLSearchParams({ Root: RootName, Path: RelativePath });
   return FetchJson(`/file?${Params}`, { method: "PUT", body: Content });