/
ApResolverService.ts
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/
ApResolverService.ts
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/*
* SPDX-FileCopyrightText: syuilo and other misskey contributors
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { Inject, Injectable } from '@nestjs/common';
import { IsNull, Not } from 'typeorm';
import type { MiLocalUser, MiRemoteUser } from '@/models/User.js';
import { InstanceActorService } from '@/core/InstanceActorService.js';
import type { NotesRepository, PollsRepository, NoteReactionsRepository, UsersRepository, FollowRequestsRepository } from '@/models/_.js';
import type { Config } from '@/config.js';
import { MetaService } from '@/core/MetaService.js';
import { HttpRequestService } from '@/core/HttpRequestService.js';
import { DI } from '@/di-symbols.js';
import { UtilityService } from '@/core/UtilityService.js';
import { bindThis } from '@/decorators.js';
import { LoggerService } from '@/core/LoggerService.js';
import type Logger from '@/logger.js';
import { isCollectionOrOrderedCollection } from './type.js';
import { ApDbResolverService } from './ApDbResolverService.js';
import { ApRendererService } from './ApRendererService.js';
import { ApRequestService } from './ApRequestService.js';
import type { IObject, ICollection, IOrderedCollection } from './type.js';
export class Resolver {
private history: Set<string>;
private user?: MiLocalUser;
private logger: Logger;
constructor(
private config: Config,
private usersRepository: UsersRepository,
private notesRepository: NotesRepository,
private pollsRepository: PollsRepository,
private noteReactionsRepository: NoteReactionsRepository,
private followRequestsRepository: FollowRequestsRepository,
private utilityService: UtilityService,
private instanceActorService: InstanceActorService,
private metaService: MetaService,
private apRequestService: ApRequestService,
private httpRequestService: HttpRequestService,
private apRendererService: ApRendererService,
private apDbResolverService: ApDbResolverService,
private loggerService: LoggerService,
private recursionLimit = 100,
) {
this.history = new Set();
this.logger = this.loggerService.getLogger('ap-resolve');
}
@bindThis
public getHistory(): string[] {
return Array.from(this.history);
}
@bindThis
public async resolveCollection(value: string | IObject): Promise<ICollection | IOrderedCollection> {
const collection = typeof value === 'string'
? await this.resolve(value)
: value;
if (isCollectionOrOrderedCollection(collection)) {
return collection;
} else {
throw new Error(`unrecognized collection type: ${collection.type}`);
}
}
@bindThis
public async resolve(value: string | IObject): Promise<IObject> {
if (typeof value !== 'string') {
return value;
}
if (value.includes('#')) {
// URLs with fragment parts cannot be resolved correctly because
// the fragment part does not get transmitted over HTTP(S).
// Avoid strange behaviour by not trying to resolve these at all.
throw new Error(`cannot resolve URL with fragment: ${value}`);
}
if (this.history.has(value)) {
throw new Error('cannot resolve already resolved one');
}
if (this.history.size > this.recursionLimit) {
throw new Error(`hit recursion limit: ${this.utilityService.extractDbHost(value)}`);
}
this.history.add(value);
const host = this.utilityService.extractDbHost(value);
if (this.utilityService.isSelfHost(host)) {
return await this.resolveLocal(value);
}
const meta = await this.metaService.fetch();
if (this.utilityService.isBlockedHost(meta.blockedHosts, host)) {
throw new Error('Instance is blocked');
}
if (this.config.signToActivityPubGet && !this.user) {
this.user = await this.instanceActorService.getInstanceActor();
}
const object = (this.user
? await this.apRequestService.signedGet(value, this.user) as IObject
: await this.httpRequestService.getJson(value, 'application/activity+json, application/ld+json')) as IObject;
if (
Array.isArray(object['@context']) ?
!(object['@context'] as unknown[]).includes('https://www.w3.org/ns/activitystreams') :
object['@context'] !== 'https://www.w3.org/ns/activitystreams'
) {
throw new Error('invalid response');
}
return object;
}
@bindThis
private resolveLocal(url: string): Promise<IObject> {
const parsed = this.apDbResolverService.parseUri(url);
if (!parsed.local) throw new Error('resolveLocal: not local');
switch (parsed.type) {
case 'notes':
return this.notesRepository.findOneByOrFail({ id: parsed.id })
.then(async note => {
if (parsed.rest === 'activity') {
// this refers to the create activity and not the note itself
return this.apRendererService.addContext(this.apRendererService.renderCreate(await this.apRendererService.renderNote(note), note));
} else {
return this.apRendererService.renderNote(note);
}
});
case 'users':
return this.usersRepository.findOneByOrFail({ id: parsed.id })
.then(user => this.apRendererService.renderPerson(user as MiLocalUser));
case 'questions':
// Polls are indexed by the note they are attached to.
return Promise.all([
this.notesRepository.findOneByOrFail({ id: parsed.id }),
this.pollsRepository.findOneByOrFail({ noteId: parsed.id }),
])
.then(([note, poll]) => this.apRendererService.renderQuestion({ id: note.userId }, note, poll));
case 'likes':
return this.noteReactionsRepository.findOneByOrFail({ id: parsed.id }).then(async reaction =>
this.apRendererService.addContext(await this.apRendererService.renderLike(reaction, { uri: null })));
case 'follows':
return this.followRequestsRepository.findOneBy({ id: parsed.id })
.then(async followRequest => {
if (followRequest == null) throw new Error('resolveLocal: invalid follow request ID');
const [follower, followee] = await Promise.all([
this.usersRepository.findOneBy({
id: followRequest.followerId,
host: IsNull(),
}),
this.usersRepository.findOneBy({
id: followRequest.followeeId,
host: Not(IsNull()),
}),
]);
if (follower == null || followee == null) {
throw new Error('resolveLocal: follower or followee does not exist');
}
return this.apRendererService.addContext(this.apRendererService.renderFollow(follower as MiLocalUser | MiRemoteUser, followee as MiLocalUser | MiRemoteUser, url));
});
default:
throw new Error(`resolveLocal: type ${parsed.type} unhandled`);
}
}
}
@Injectable()
export class ApResolverService {
constructor(
@Inject(DI.config)
private config: Config,
@Inject(DI.usersRepository)
private usersRepository: UsersRepository,
@Inject(DI.notesRepository)
private notesRepository: NotesRepository,
@Inject(DI.pollsRepository)
private pollsRepository: PollsRepository,
@Inject(DI.noteReactionsRepository)
private noteReactionsRepository: NoteReactionsRepository,
@Inject(DI.followRequestsRepository)
private followRequestsRepository: FollowRequestsRepository,
private utilityService: UtilityService,
private instanceActorService: InstanceActorService,
private metaService: MetaService,
private apRequestService: ApRequestService,
private httpRequestService: HttpRequestService,
private apRendererService: ApRendererService,
private apDbResolverService: ApDbResolverService,
private loggerService: LoggerService,
) {
}
@bindThis
public createResolver(): Resolver {
return new Resolver(
this.config,
this.usersRepository,
this.notesRepository,
this.pollsRepository,
this.noteReactionsRepository,
this.followRequestsRepository,
this.utilityService,
this.instanceActorService,
this.metaService,
this.apRequestService,
this.httpRequestService,
this.apRendererService,
this.apDbResolverService,
this.loggerService,
);
}
}