108 lines
2.5 KiB
TypeScript
108 lines
2.5 KiB
TypeScript
import { Injectable } from '@nestjs/common';
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import promiseLimit from 'promise-limit';
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import type { RemoteUser, User } from '@/models/entities/User.js';
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import { concat, unique } from '@/misc/prelude/array.js';
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import { bindThis } from '@/decorators.js';
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import { getApIds } from './type.js';
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import { ApPersonService } from './models/ApPersonService.js';
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import type { ApObject } from './type.js';
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import type { Resolver } from './ApResolverService.js';
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type Visibility = 'public' | 'home' | 'followers' | 'specified';
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type AudienceInfo = {
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visibility: Visibility,
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mentionedUsers: User[],
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visibleUsers: User[],
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};
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@Injectable()
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export class ApAudienceService {
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constructor(
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private apPersonService: ApPersonService,
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) {
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}
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@bindThis
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public async parseAudience(actor: RemoteUser, to?: ApObject, cc?: ApObject, resolver?: Resolver): Promise<AudienceInfo> {
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const toGroups = this.groupingAudience(getApIds(to), actor);
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const ccGroups = this.groupingAudience(getApIds(cc), actor);
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const others = unique(concat([toGroups.other, ccGroups.other]));
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const limit = promiseLimit<User | null>(2);
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const mentionedUsers = (await Promise.all(
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others.map(id => limit(() => this.apPersonService.resolvePerson(id, resolver).catch(() => null))),
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)).filter((x): x is User => x != null);
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if (toGroups.public.length > 0) {
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return {
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visibility: 'public',
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mentionedUsers,
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visibleUsers: [],
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};
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}
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if (ccGroups.public.length > 0) {
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return {
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visibility: 'home',
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mentionedUsers,
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visibleUsers: [],
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};
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}
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if (toGroups.followers.length > 0) {
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return {
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visibility: 'followers',
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mentionedUsers,
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visibleUsers: [],
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};
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}
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return {
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visibility: 'specified',
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mentionedUsers,
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visibleUsers: mentionedUsers,
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};
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}
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@bindThis
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private groupingAudience(ids: string[], actor: RemoteUser) {
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const groups = {
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public: [] as string[],
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followers: [] as string[],
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other: [] as string[],
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};
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for (const id of ids) {
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if (this.isPublic(id)) {
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groups.public.push(id);
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} else if (this.isFollowers(id, actor)) {
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groups.followers.push(id);
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} else {
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groups.other.push(id);
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}
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}
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groups.other = unique(groups.other);
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return groups;
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}
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@bindThis
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private isPublic(id: string) {
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return [
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'https://www.w3.org/ns/activitystreams#Public',
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'as#Public',
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'Public',
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].includes(id);
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}
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@bindThis
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private isFollowers(id: string, actor: RemoteUser) {
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return (
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id === (actor.followersUri ?? `${actor.uri}/followers`)
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);
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}
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}
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