import { URL } from 'node:url'; import { toASCII } from 'punycode'; import { Inject, Injectable } from '@nestjs/common'; import { DI } from '@/di-symbols.js'; import { Config } from '@/config.js'; @Injectable() export class UtilityService { constructor( @Inject(DI.config) private config: Config, ) { } public getFullApAccount(username: string, host: string | null): string { return host ? `${username}@${this.toPuny(host)}` : `${username}@${this.toPuny(this.config.host)}`; } public isSelfHost(host: string | null): boolean { if (host == null) return true; return this.toPuny(this.config.host) === this.toPuny(host); } public extractDbHost(uri: string): string { const url = new URL(uri); return this.toPuny(url.hostname); } public toPuny(host: string): string { return toASCII(host.toLowerCase()); } public toPunyNullable(host: string | null | undefined): string | null { if (host == null) return null; return toASCII(host.toLowerCase()); } }