mirror of
https://git.joinfirefish.org/firefish/firefish.git
synced 2024-05-19 05:31:11 +02:00
b71da18b03
Co-authored-by: naskya <m@naskya.net>
215 lines
6.6 KiB
TypeScript
215 lines
6.6 KiB
TypeScript
import config from "@/config/index.js";
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import type { ILocalUser } from "@/models/entities/user.js";
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import { getInstanceActor } from "@/services/instance-actor.js";
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import { fetchMeta } from "backend-rs";
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import { extractHost, isSelfHost } from "backend-rs";
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import { apGet } from "./request.js";
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import type { IObject, ICollection, IOrderedCollection } from "./type.js";
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import { isCollectionOrOrderedCollection, getApId } from "./type.js";
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import {
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FollowRequests,
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Notes,
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NoteReactions,
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Polls,
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Users,
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} from "@/models/index.js";
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import { parseUri } from "./db-resolver.js";
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import renderNote from "@/remote/activitypub/renderer/note.js";
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import { renderLike } from "@/remote/activitypub/renderer/like.js";
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import { renderPerson } from "@/remote/activitypub/renderer/person.js";
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import renderQuestion from "@/remote/activitypub/renderer/question.js";
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import renderCreate from "@/remote/activitypub/renderer/create.js";
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import { renderActivity } from "@/remote/activitypub/renderer/index.js";
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import renderFollow from "@/remote/activitypub/renderer/follow.js";
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import { shouldBlockInstance } from "@/misc/should-block-instance.js";
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import { apLogger } from "@/remote/activitypub/logger.js";
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import { IsNull, Not } from "typeorm";
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export default class Resolver {
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private history: Set<string>;
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private user?: ILocalUser;
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private recursionLimit?: number;
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constructor(recursionLimit = 100) {
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this.history = new Set();
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this.recursionLimit = recursionLimit;
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}
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public setUser(user) {
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this.user = user;
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}
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public reset(): Resolver {
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this.history = new Set();
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return this;
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}
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public getHistory(): string[] {
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return Array.from(this.history);
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}
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public async resolveCollection(
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value: string | IObject,
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): Promise<ICollection | IOrderedCollection> {
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const collection = await this.resolve(value);
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if (isCollectionOrOrderedCollection(collection)) {
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return collection;
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} else {
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throw new Error(`unrecognized collection type: ${collection.type}`);
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}
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}
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public async resolve(value: string | IObject): Promise<IObject> {
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if (value == null) {
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throw new Error("resolvee is null (or undefined)");
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}
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if (typeof value !== "string") {
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apLogger.debug("Object to resolve is not a string");
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if (typeof value.id !== "undefined") {
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const host = extractHost(getApId(value));
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if (await shouldBlockInstance(host)) {
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throw new Error("instance is blocked");
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}
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}
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apLogger.debug("Returning existing object:");
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apLogger.debug(JSON.stringify(value, null, 2));
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return value;
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}
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apLogger.debug(`Resolving: ${value}`);
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if (value.includes("#")) {
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// URLs with fragment parts cannot be resolved correctly because
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// the fragment part does not get transmitted over HTTP(S).
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// Avoid strange behaviour by not trying to resolve these at all.
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throw new Error(`cannot resolve URL with fragment: ${value}`);
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}
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if (this.history.has(value)) {
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throw new Error("cannot resolve already resolved one");
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}
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if (this.recursionLimit && this.history.size > this.recursionLimit) {
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throw new Error("hit recursion limit");
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}
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this.history.add(value);
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const host = extractHost(value);
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if (isSelfHost(host)) {
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return await this.resolveLocal(value);
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}
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const meta = await fetchMeta(true);
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if (await shouldBlockInstance(host, meta)) {
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throw new Error("Instance is blocked");
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}
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if (
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meta.privateMode &&
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config.host !== host &&
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!meta.allowedHosts.includes(host)
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) {
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throw new Error("Instance is not allowed");
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}
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if (!this.user) {
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this.user = await getInstanceActor();
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}
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apLogger.debug("Getting object from remote, authenticated as user:");
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apLogger.debug(JSON.stringify(this.user, null, 2));
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const { finalUrl, content: object } = await apGet(value, this.user);
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if (
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object == null ||
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(Array.isArray(object["@context"])
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? !(object["@context"] as unknown[]).includes(
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"https://www.w3.org/ns/activitystreams",
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)
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: object["@context"] !== "https://www.w3.org/ns/activitystreams")
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) {
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throw new Error("invalid response");
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}
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if (object.id == null) {
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throw new Error("Object has no ID");
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}
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if (finalUrl === object.id) return object;
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if (new URL(finalUrl).host !== new URL(object.id).host) {
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throw new Error("Object ID host doesn't match final url host");
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}
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const finalRes = await apGet(object.id, this.user);
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if (finalRes.finalUrl !== finalRes.content.id)
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throw new Error(
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"Object ID still doesn't match final URL after second fetch attempt",
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);
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return finalRes.content;
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}
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private async resolveLocal(url: string): Promise<IObject> {
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const parsed = parseUri(url);
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if (!parsed.local) throw new Error("resolveLocal: not local");
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switch (parsed.type) {
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case "notes":
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const note = await Notes.findOneByOrFail({ id: parsed.id });
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if (parsed.rest === "activity") {
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// this refers to the create activity and not the note itself
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return renderActivity(renderCreate(renderNote(note), note));
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} else {
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return renderNote(note);
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}
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case "users":
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const user = await Users.findOneByOrFail({ id: parsed.id });
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return await renderPerson(user as ILocalUser);
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case "questions":
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// Polls are indexed by the note they are attached to.
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const [pollNote, poll] = await Promise.all([
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Notes.findOneByOrFail({ id: parsed.id }),
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Polls.findOneByOrFail({ noteId: parsed.id }),
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]);
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return await renderQuestion({ id: pollNote.userId }, pollNote, poll);
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case "likes":
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const reaction = await NoteReactions.findOneByOrFail({ id: parsed.id });
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return renderActivity(renderLike(reaction, { uri: null }));
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case "follows":
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// if rest is a <followee id>
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if (parsed.rest != null && /^\w+$/.test(parsed.rest)) {
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const [follower, followee] = await Promise.all(
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[parsed.id, parsed.rest].map((id) => Users.findOneByOrFail({ id })),
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);
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return renderActivity(renderFollow(follower, followee, url));
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}
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// Another situation is there is only requestId, then obtained object from database.
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const followRequest = await FollowRequests.findOneBy({
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id: parsed.id,
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});
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if (followRequest == null) {
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throw new Error("resolveLocal: invalid follow URI");
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}
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const follower = await Users.findOneBy({
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id: followRequest.followerId,
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host: IsNull(),
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});
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const followee = await Users.findOneBy({
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id: followRequest.followeeId,
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host: Not(IsNull()),
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});
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if (follower == null || followee == null) {
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throw new Error("resolveLocal: invalid follow URI");
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}
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return renderActivity(renderFollow(follower, followee, url));
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default:
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throw new Error(`resolveLocal: type ${parsed.type} unhandled`);
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}
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}
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}
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