special-filter.ts
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special-filter.ts
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	import type { App } from "../app/app.js";
	import type Query from "../datastore/query.js";
	import type { QueryStage } from "../datastore/query.js";

	export default abstract class SpecialFilter {
	params: any;
	app: App;
	collection_name: string;

	constructor(collection_name: string, params: any) {
	this.params = params;
	this.collection_name = collection_name;
	}

	init(app: App) {
	this.app = app;
	}

	abstract getFilteringQuery(): Promise<Query>;
	abstract getNopassReason(): string;

	getCollection() {
	return this.app.collections[this.collection_name];
	}

	async checkSingleResource(app: App, resource_id: string) {
	const documents = await app.Datastore.aggregate(
	this.getCollection().name,
	[
	{ $match: { id: resource_id } },
	...(await this.getFilteringQuery()).toPipeline(),
	] as QueryStage[]
	);

	return documents.length
	? SpecialFilter.pass()
	: SpecialFilter.nopass(this.getNopassReason());
	}

	static pass = async () => ({ passed: true });
	static nopass = async (reason: string) => ({ passed: false, reason });
	}