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import { Inject, Injectable } from '@nestjs/common';
import { IsNull } from 'typeorm';
import type { ILocalUser, User } from '@/models/entities/User.js';
import { 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 {
#relaysCache: Cache<Relay[]>;
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<Relay[]>(1000 * 60 * 10);
}
async #getRelayActor(): Promise<ILocalUser> {
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<Relay> {
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<void> {
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<Relay[]> {
const relays = await this.relaysRepository.find();
return relays;
}
public async relayAccepted(id: string): Promise<string> {
const result = await this.relaysRepository.update(id, {
status: 'accepted',
});
return JSON.stringify(result);
}
public async relayRejected(id: string): Promise<string> {
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<void> {
if (activity == null) return;
const relays = await this.#relaysCache.fetch(null, () => this.relaysRepository.findBy({
status: 'accepted',
}));
if (relays.length === 0) return;
// TODO
//const copy = structuredClone(activity);
const copy = JSON.parse(JSON.stringify(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);
}
}
}
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