234 lines
9.7 KiB
JavaScript
234 lines
9.7 KiB
JavaScript
import config from "../../config/index.js";
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import { getJsonActivity } from "../../misc/fetch.js";
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import { getInstanceActor } from "../../services/instance-actor.js";
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import { fetchMeta } from "../../misc/fetch-meta.js";
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import { extractDbHost, isSelfHost } from "../../misc/convert-host.js";
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import { signedGet } from "./request.js";
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import { isCollectionOrOrderedCollection, getApId } from "./type.js";
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import { FollowRequests, Notes, NoteReactions, Polls, Users, Bites, InteractionStamps } from "../../models/index.js";
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import { parseUri } from "./db-resolver.js";
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import renderNote from "./renderer/note.js";
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import { renderLike } from "./renderer/like.js";
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import { renderPerson } from "./renderer/person.js";
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import renderQuestion from "./renderer/question.js";
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import renderCreate from "./renderer/create.js";
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import { renderActivity } from "./renderer/index.js";
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import renderFollow from "./renderer/follow.js";
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import { shouldBlockInstance } from "../../misc/should-block-instance.js";
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import { apLogger } from "./logger.js";
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import { IsNull, Not } from "typeorm";
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import { tickResolve } from "../../metrics.js";
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import renderBite from "./renderer/bite.js";
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import renderQuoteAuthorization from "./renderer/quote-authorization.js";
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export default class Resolver {
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history;
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user;
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recursionLimit;
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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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setUser(user) {
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this.user = user;
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}
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reset() {
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this.history = new Set();
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return this;
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}
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getHistory() {
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return Array.from(this.history);
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}
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async resolveCollection(value) {
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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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async resolve(value) {
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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 = extractDbHost(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 = extractDbHost(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();
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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 (meta.privateMode && config.host !== host && config.domain !== host && !meta.allowedHosts.includes(host)) {
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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 { res, object } = await this.doFetch(value);
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if (object.id == null) throw new Error("Object has no ID");
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const objectId = new URL(object.id);
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const resFinalUrl = new URL(res.finalUrl);
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if (resFinalUrl.toString() === objectId.toString()) {
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tickResolve();
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return object;
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}
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if (resFinalUrl.host !== objectId.host) throw new Error("Object ID host doesn't match final url host");
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const { res: finalRes, object: finalObject } = await this.doFetch(object.id);
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if (finalObject.id == null) throw new Error("Final object has no ID");
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const finalObjectId = new URL(finalObject.id);
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const finalResFinalUrl = new URL(finalRes.finalUrl);
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if (finalResFinalUrl.toString() !== finalObjectId.toString()) throw new Error("Object ID still doesn't match final URL after second fetch attempt");
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tickResolve();
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return finalObject;
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}
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async doFetch(uri) {
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let res = this.user ? await signedGet(uri, this.user) : await getJsonActivity(uri);
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let object = res.content;
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if (object == null || (Array.isArray(object["@context"]) ? !object["@context"].includes("https://www.w3.org/ns/activitystreams") : object["@context"] !== "https://www.w3.org/ns/activitystreams")) {
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throw new Error("invalid response");
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}
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return {
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res,
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object
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};
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}
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async resolveLocal(url) {
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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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{
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const note = await Notes.findOneByOrFail({
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id: parsed.id
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});
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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(await renderNote(note), note));
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} else {
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return renderActivity(await renderNote(note));
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}
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}
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case "users":
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{
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const user = await Users.findOneByOrFail({
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id: parsed.id
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});
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return await renderPerson(user);
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}
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case "questions":
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{
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// Polls are indexed by the note they are attached to.
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const [note, poll] = await Promise.all([
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Notes.findOneByOrFail({
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id: parsed.id
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}),
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Polls.findOneByOrFail({
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noteId: parsed.id
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})
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]);
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return renderActivity(await renderQuestion({
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id: note.userId
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}, note, poll));
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}
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case "likes":
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{
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const reaction = await NoteReactions.findOneByOrFail({
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id: parsed.id
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});
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return renderActivity(await renderLike(reaction, {
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uri: null
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}));
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}
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case "follows":
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{
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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 = await Users.findOneByOrFail({
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id: parsed.id
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});
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const followee = await Users.findOneByOrFail({
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id: parsed.rest
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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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}
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case "bites":
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{
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const bite = await Bites.findOneOrFail({
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where: {
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id: parsed.id
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},
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relations: [
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"targetUser",
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"targetBite",
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"targetNote"
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]
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});
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return renderActivity(await renderBite(bite));
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}
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case "stamp":
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{
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const stamp = await InteractionStamps.findOneOrFail({
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where: {
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id: parsed.id
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},
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relations: [
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"note",
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"targetNote"
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]
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});
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return renderActivity(renderQuoteAuthorization(stamp));
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}
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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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