hide restricted edit history from mastodon api (resolves #811)

packages/backend/src/server/api/mastodon/MastodonDataService.ts

@@ -0,0 +1,40 @@
+/*
+ * SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { DI } from '@/di-symbols.js';
+import { QueryService } from '@/core/QueryService.js';
+import type { MiNote, NotesRepository } from '@/models/_.js';
+import type { MiLocalUser } from '@/models/User.js';
+
+/**
+ * Utility service for accessing data with Mastodon semantics
+ */
+@Injectable()
+export class MastodonDataService {
+	constructor(
+		@Inject(DI.notesRepository)
+		private readonly notesRepository: NotesRepository,
+
+		@Inject(QueryService)
+		private readonly queryService: QueryService,
+	) {}
+
+	public async getNote(noteId: string, me?: MiLocalUser | null): Promise<MiNote | null> {
+		// Root query: note + required dependencies
+		const query = this.notesRepository
+			.createQueryBuilder('note')
+			.where('note.id = :noteId', { noteId })
+			.innerJoinAndSelect('note.user', 'user');
+
+		// Restrict visibility
+		this.queryService.generateVisibilityQuery(query, me);
+		if (me) {
+			this.queryService.generateBlockedUserQuery(query, me);
+		}
+
+		return await query.getOne();
+	}
+}