import { Inject, Injectable } from '@nestjs/common'; import { IsNull } from 'typeorm'; import type { ILocalUser, User } from '@/models/entities/User.js'; import type { RelaysRepository, UsersRepository } from '@/models/index.js'; import { IdService } from '@/core/IdService.js'; import { Cache } from '@/misc/cache.js'; import type { Relay } from '@/models/entities/Relay.js'; import { QueueService } from '@/core/QueueService.js'; import { CreateSystemUserService } from '@/core/CreateSystemUserService.js'; import { ApRendererService } from '@/core/remote/activitypub/ApRendererService.js'; import { DI } from '@/di-symbols.js'; const ACTOR_USERNAME = 'relay.actor' as const; @Injectable() export class RelayService { private relaysCache: Cache; constructor( @Inject(DI.usersRepository) private usersRepository: UsersRepository, @Inject(DI.relaysRepository) private relaysRepository: RelaysRepository, private idService: IdService, private queueService: QueueService, private createSystemUserService: CreateSystemUserService, private apRendererService: ApRendererService, ) { this.relaysCache = new Cache(1000 * 60 * 10); } private async getRelayActor(): Promise { const user = await this.usersRepository.findOneBy({ host: IsNull(), username: ACTOR_USERNAME, }); if (user) return user as ILocalUser; const created = await this.createSystemUserService.createSystemUser(ACTOR_USERNAME); return created as ILocalUser; } public async addRelay(inbox: string): Promise { const relay = await this.relaysRepository.insert({ id: this.idService.genId(), inbox, status: 'requesting', }).then(x => this.relaysRepository.findOneByOrFail(x.identifiers[0])); const relayActor = await this.getRelayActor(); const follow = await this.apRendererService.renderFollowRelay(relay, relayActor); const activity = this.apRendererService.renderActivity(follow); this.queueService.deliver(relayActor, activity, relay.inbox); return relay; } public async removeRelay(inbox: string): Promise { const relay = await this.relaysRepository.findOneBy({ inbox, }); if (relay == null) { throw new Error('relay not found'); } const relayActor = await this.getRelayActor(); const follow = this.apRendererService.renderFollowRelay(relay, relayActor); const undo = this.apRendererService.renderUndo(follow, relayActor); const activity = this.apRendererService.renderActivity(undo); this.queueService.deliver(relayActor, activity, relay.inbox); await this.relaysRepository.delete(relay.id); } public async listRelay(): Promise { const relays = await this.relaysRepository.find(); return relays; } public async relayAccepted(id: string): Promise { const result = await this.relaysRepository.update(id, { status: 'accepted', }); return JSON.stringify(result); } public async relayRejected(id: string): Promise { const result = await this.relaysRepository.update(id, { status: 'rejected', }); return JSON.stringify(result); } public async deliverToRelays(user: { id: User['id']; host: null; }, activity: any): Promise { if (activity == null) return; const relays = await this.relaysCache.fetch(null, () => this.relaysRepository.findBy({ status: 'accepted', })); if (relays.length === 0) return; const copy = structuredClone(activity); if (!copy.to) copy.to = ['https://www.w3.org/ns/activitystreams#Public']; const signed = await this.apRendererService.attachLdSignature(copy, user); for (const relay of relays) { this.queueService.deliver(user, signed, relay.inbox); } } }