refactor(export/zip): extract into separate provider

apps/server/src/services/export/zip/abstract_provider.ts

@@ -0,0 +1,27 @@
+import { Archiver } from "archiver";
+import type { default as NoteMeta, NoteMetaFile } from "../../meta/note_meta.js";
+
+interface ZipExportProviderData {
+    getNoteTargetUrl: (targetNoteId: string, sourceMeta: NoteMeta) => string | null;
+    metaFile: NoteMetaFile;
+    rootMeta: NoteMeta;
+    archive: Archiver;
+}
+
+export abstract class ZipExportProvider {
+
+    metaFile: NoteMetaFile;
+    getNoteTargetUrl: (targetNoteId: string, sourceMeta: NoteMeta) => string | null;
+    rootMeta: NoteMeta;
+    archive: Archiver;
+
+    constructor(data: ZipExportProviderData) {
+        this.metaFile = data.metaFile;
+        this.getNoteTargetUrl = data.getNoteTargetUrl;
+        this.rootMeta = data.rootMeta;
+        this.archive = data.archive;
+    }
+
+    abstract prepareMeta(): void;
+    abstract afterDone(): void;
+}