Removed relay jank, fixed local object rendering in resolution, and refactored local URI parsing

2024-11-25 04:13:48 +01:00 · 2024-11-25 04:13:48 +01:00 · e77ba36953
parent e845eda898
commit e77ba36953
28 changed files with 319 additions and 1384 deletions
--- a/packages/backend/src/mag/rpc-client.ts
+++ b/packages/backend/src/mag/rpc-client.ts
@ -4,7 +4,6 @@ import {SmartBuffer} from "smart-buffer";
 import {decode, encode} from "@msgpack/msgpack";
 import Logger from "@/services/logger.js";
 import config from "@/config/index.js";
-import type {IObject} from "@/remote/activitypub/type";

 let client: Socket | null = null;
 let exponentialBackoff = 0;
@ -162,7 +161,7 @@ async function rpcCall<D, T>(method: string, data: D): Promise<T> {
 }


-export async function magApGet(userId: string, url: string): Promise<IObject> {
+export async function magApGet(userId: string, url: string): Promise<any> {
    logger.debug(`AP GET to: ${url}`);
    return await rpcCall("/ap/get", {
        user_id: userId,
@ -170,7 +169,7 @@ export async function magApGet(userId: string, url: string): Promise<IObject> {
    });
 }

-export async function magApPost(userId: string, url: string, body: any): Promise<IObject> {
+export async function magApPost(userId: string, url: string, body: any): Promise<any> {
    logger.debug(`AP POST to: ${url}`);
    return await rpcCall("/ap/post", {
        user_id: userId,
--- a/packages/backend/src/queue/initialize.ts
+++ b/packages/backend/src/queue/initialize.ts
@ -1,6 +1,15 @@
 import Bull from "bull";
 import config from "@/config/index.js";

+export class RetriableLater extends Error {
+    constructor(message: string) {
+        super(message);
+        this.name = "RetriableLater";
+
+        Object.setPrototypeOf(this, RetriableLater.prototype);
+    }
+}
+
 export function initialize<T>(name: string, limitPerSec = -1) {
 	return new Bull<T>(name, {
 		redis: {
@ -34,7 +43,7 @@ function apBackoff(attemptsMade: number, err: Error) {
 	const maxBackoff = 8 * 60 * 60 * 1000; // 8hours
 	let backoff = (Math.pow(2, attemptsMade) - 1) * baseDelay;

-    if (err?.message?.startsWith("RetriableLater")) {
+    if (err instanceof RetriableLater) {
        backoff += (Math.pow(1.5, attemptsMade) - 1) * baseDelay * 10 * attemptsMade;
    }

--- a/packages/backend/src/queue/processors/inbox.ts
+++ b/packages/backend/src/queue/processors/inbox.ts
@ -1,27 +1,25 @@
 import {URL} from "node:url";
 import type Bull from "bull";
 import httpSignature from "@peertube/http-signature";
-import perform from "@/remote/activitypub/perform.js";
 import Logger from "@/services/logger.js";
 import {registerOrFetchInstanceDoc} from "@/services/register-or-fetch-instance-doc.js";
 import {Instances} from "@/models/index.js";
-import {
-	apRequestChart,
-	federationChart,
-	instanceChart,
-} from "@/services/chart/index.js";
+import {apRequestChart, federationChart, instanceChart,} from "@/services/chart/index.js";
 import {fetchMeta} from "@/misc/fetch-meta.js";
-import { toPuny, extractDbHost } from "@/misc/convert-host.js";
-import { getApId } from "@/remote/activitypub/type.js";
+import {extractDbHost, toPuny} from "@/misc/convert-host.js";
+import {getApId, isCollection, isCollectionOrOrderedCollection} from "@/remote/activitypub/type.js";
 import {fetchInstanceMetadata} from "@/services/fetch-instance-metadata.js";
 import type {InboxJobData} from "../types.js";
 import DbResolver from "@/remote/activitypub/db-resolver.js";
-import { resolvePerson } from "@/remote/activitypub/models/person.js";
-import { LdSignature } from "@/remote/activitypub/misc/ld-signature.js";
 import {StatusError} from "@/misc/fetch.js";
 import type {CacheableRemoteUser} from "@/models/entities/user.js";
 import type {UserPublickey} from "@/models/entities/user-publickey.js";
 import {shouldBlockInstance} from "@/misc/should-block-instance.js";
+import {updatePerson} from "@/remote/activitypub/models/person";
+import {performActivity} from "@/remote/activitypub/kernel";
+import Resolver from "@/remote/activitypub/resolver";
+import {toArray} from "@/prelude/array";
+import {apLogger} from "@/remote/activitypub/logger";

 const logger = new Logger("inbox");

@ -38,17 +36,17 @@ export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
 	if (!signature?.keyId) return `Invalid signature: ${signature}`;

 	//#endregion
-	const host = toPuny(new URL(signature.keyId).hostname);
+	const httpSigKeyHost = toPuny(new URL(signature.keyId).hostname);

 	// interrupt if blocked
 	const meta = await fetchMeta();
-	if (await shouldBlockInstance(host, meta)) {
-		return `Blocked request: ${host}`;
+	if (await shouldBlockInstance(httpSigKeyHost, meta)) {
+		return `Blocked request: ${httpSigKeyHost}`;
 	}

 	// only whitelisted instances in private mode
-	if (meta.privateMode && !meta.allowedHosts.includes(host)) {
-		return `Blocked request: ${host}`;
+	if (meta.privateMode && !meta.allowedHosts.includes(httpSigKeyHost)) {
+		return `Blocked request: ${httpSigKeyHost}`;
 	}

 	const keyIdLower = signature.keyId.toLowerCase();
@ -59,19 +57,18 @@ export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
 	const dbResolver = new DbResolver();

 	// HTTP-Signature keyId from DB
-	let authUser: {
+	let senderActor: {
 		user: CacheableRemoteUser;
 		key: UserPublickey | null;
 	} | null = await dbResolver.getAuthUserFromKeyId(signature.keyId);

-	// keyIdでわからなければ、activity.actorを元にDBから取得 || activity.actorを元にリモートから取得
-	if (authUser == null) {
+	if (senderActor == null) {
 		try {
-			authUser = await dbResolver.getAuthUserFromApId(getApId(activity.actor));
+			senderActor = await dbResolver.getAuthUserFromApId(getApId(activity.actor));
 		} catch (e) {
 			// Skip if target is 4xx
 			if (e instanceof StatusError) {
-				if (e.isClientError) {
+				if (e.isClientError && e.statusCode != 429) {
 					return `skip: Ignored deleted actors on both ends ${activity.actor} - ${e.statusCode}`;
 				}
 				throw new Error(
@ -81,84 +78,63 @@ export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
 		}
 	}

-	// それでもわからなければ終了
-	if (authUser == null) {
+	if (senderActor == null) {
 		return "skip: failed to resolve user";
 	}

-	// publicKey がなくても終了
-	if (authUser.key == null) {
+	if (senderActor.key == null) {
 		return "skip: failed to resolve user publicKey";
 	}

-	// HTTP-Signatureの検証
    const httpSignatureValidated = httpSignature.verifySignature(
 		signature,
-		authUser.key.keyPem,
+		senderActor.key.keyPem,
 	);

-	// また、signatureのsignerは、activity.actorと一致する必要がある
-	if (!httpSignatureValidated || authUser.user.uri !== activity.actor) {
-		// 一致しなくても、でもLD-Signatureがありそうならそっちも見る
-		if (activity.signature) {
-			if (activity.signature.type !== "RsaSignature2017") {
-				return `skip: unsupported LD-signature type ${activity.signature.type}`;
+	if (!httpSignatureValidated) {
+        return `skip: http-signature verification failed. keyId=${signature.keyId}`;
 	}

-			// activity.signature.creator: https://example.oom/users/user#main-key
-			// みたいになっててUserを引っ張れば公開キーも入ることを期待する
-			if (activity.signature.creator) {
-				const candicate = activity.signature.creator.replace(/#.*/, "");
-				await resolvePerson(candicate).catch(() => null);
+    const signerHost = extractDbHost(senderActor.user.uri!);
+	if (isCollectionOrOrderedCollection(activity)) {
+		const resolver = new Resolver();
+		for (const item of toArray(
+			isCollection(activity) ? activity.items : activity.orderedItems,
+		)) {
+			const act = await resolver.resolve(item);
+
+            if (typeof act.id !== "string") {
+                continue;
            }

-			// keyIdからLD-Signatureのユーザーを取得
-			authUser = await dbResolver.getAuthUserFromKeyId(
-				activity.signature.creator,
-			);
-			if (authUser == null) {
-				return "skip: LD-Signatureのユーザーが取得できませんでした";
+            const activityIdHost = extractDbHost(act.id);
+            if (signerHost !== activityIdHost) {
+                continue;
            }

-			if (authUser.key == null) {
-				return "skip: LD-SignatureのユーザーはpublicKeyを持っていませんでした";
+			try {
+                await performActivity(senderActor.user, act);
+			} catch (err) {
+				if (err instanceof Error || typeof err === "string") {
+					apLogger.error(err);
 				}
-
-			// LD-Signature検証
-			const ldSignature = new LdSignature();
-			const verified = await ldSignature
-				.verifyRsaSignature2017(activity, authUser.key.keyPem)
-				.catch(() => false);
-			if (!verified) {
-				return "skip: LD-Signatureの検証に失敗しました";
 			}
-
-			// もう一度actorチェック
-			if (authUser.user.uri !== activity.actor) {
-				return `skip: LD-Signature user(${authUser.user.uri}) !== activity.actor(${activity.actor})`;
-			}
-
-			// ブロックしてたら中断
-			const ldHost = extractDbHost(authUser.user.uri);
-			if (await shouldBlockInstance(ldHost, meta)) {
-				return `Blocked request: ${ldHost}`;
 		}
 	} else {
-			return `skip: http-signature verification failed and no LD-Signature. keyId=${signature.keyId}`;
-		}
+        if (typeof activity.id !== "string") {
+            return `skip: activity.id not a valid id`;
        }

-	// activity.idがあればホストが署名者のホストであることを確認する
-	if (typeof activity.id === "string") {
-		const signerHost = extractDbHost(authUser.user.uri!);
        const activityIdHost = extractDbHost(activity.id);
        if (signerHost !== activityIdHost) {
            return `skip: signerHost(${signerHost}) !== activity.id host(${activityIdHost}`;
        }
+
+        await performActivity(senderActor.user, activity);
 	}

 	// Update stats
-	registerOrFetchInstanceDoc(authUser.user.host).then((i) => {
+	registerOrFetchInstanceDoc(senderActor.user.host).then((i) => {
 		Instances.update(i.id, {
 			latestRequestReceivedAt: new Date(),
 			lastCommunicatedAt: new Date(),
@ -172,7 +148,17 @@ export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
 		federationChart.inbox(i.host);
 	});

-	// アクティビティを処理
-	await perform(authUser.user, activity);
+	// Update the remote user information if it is out of date
+	if (senderActor.user.uri) {
+		if (
+			senderActor.user.lastFetchedAt == null ||
+			Date.now() - senderActor.user.lastFetchedAt.getTime() > 1000 * 60 * 60 * 24
+		) {
+			setImmediate(() => {
+				updatePerson(senderActor?.user.uri!);
+			});
+		}
+	}
+
 	return "ok";
 };
--- a/packages/backend/src/remote/activitypub/db-resolver.ts
+++ b/packages/backend/src/remote/activitypub/db-resolver.ts
@ -1,66 +1,82 @@
-import escapeRegexp from "escape-regexp";
 import config from "@/config/index.js";
 import type {Note} from "@/models/entities/note.js";
-import type {
-	CacheableRemoteUser,
-	CacheableUser,
-} from "@/models/entities/user.js";
+import type {CacheableRemoteUser, CacheableUser,} from "@/models/entities/user.js";
 import type {UserPublickey} from "@/models/entities/user-publickey.js";
-import {
-	Notes,
-	Users,
-	UserPublickeys,
-} from "@/models/index.js";
+import {Notes, UserPublickeys, Users,} from "@/models/index.js";
 import {Cache} from "@/misc/cache.js";
 import {uriPersonCache, userByIdCache} from "@/services/user-cache.js";
 import type {IObject} from "./type.js";
 import {getApId} from "./type.js";
 import {resolvePerson} from "./models/person.js";
+import {URL} from "node:url";
+import {toPuny} from "@/misc/convert-host";

 const publicKeyCache = new Cache<UserPublickey | null>(Infinity);
 const publicKeyByUserIdCache = new Cache<UserPublickey | null>(Infinity);

+export type UriLocalObject =
+    ({ type: "Note" } | { type: "NoteActivity" } | { type: "User" } | { type: "Question" } | { type: "Like" } | { type: "Follow", followeeId: string })
+    & { id: string }
+
 export type UriParseResult =
 	| {
-			/** wether the URI was generated by us */
 			local: true;
-			/** id in DB */
-			id: string;
-			/** hint of type, e.g. "notes", "users" */
-			type: string;
-			/** any remaining text after type and id, not including the slash after id. undefined if empty */
-			rest?: string;
+            object: UriLocalObject
 	  }
 	| {
-			/** wether the URI was generated by us */
 			local: false;
-			/** uri in DB */
-			uri: string;
+			uri: URL;
 	  };

-export function parseUri(value: string | IObject): UriParseResult {
-	const uri = getApId(value);
-
-	// the host part of a URL is case insensitive, so use the 'i' flag.
-	const localRegex = new RegExp(
-		`^${escapeRegexp(config.url)}/(\\w+)/(\\w+)(?:/(.+))?`,
-		"i",
-	);
-	const matchLocal = uri.match(localRegex);
-
-	if (matchLocal) {
-		return {
-			local: true,
-			type: matchLocal[1],
-			id: matchLocal[2],
-			rest: matchLocal[3],
-		};
-	} else {
+export function parseApUri(value: string | IObject): UriParseResult {
+	const uri = new URL(getApId(value));
+    if (config.host !== toPuny(uri.host)) {
        return {
            local: false,
            uri,
        };
    }
+
+    const path = uri.pathname;
+    const [_empty, objectType, id, ...parts] = path.split("/");
+
+    if (!objectType || !id)
+        throw new Error("Invalid local object URI");
+
+    let object: UriLocalObject;
+
+    switch (true) {
+        case objectType === "notes" && parts.length == 0:
+            object = { type: parts.length == 1 && parts[0] === "activity" ? "NoteActivity" : "Note", id};
+            break;
+        case objectType === "notes" && parts.length == 1 && parts[0] === "activity":
+            object = { type: "NoteActivity", id};
+            break;
+        case objectType === "users" && parts.length == 0:
+            object = { type: "User", id };
+            break;
+        case objectType === "questions" && parts.length == 0:
+            object = { type: "Question", id };
+            break;
+        case objectType === "likes" && parts.length == 0:
+            object = { type: "Like", id };
+            break;
+        case objectType === "follows" && parts.length == 1:
+            const [followeeId] = parts;
+            object = { type: "Follow", id, followeeId };
+            break;
+        default:
+            throw new Error("Unknown object type");
+    }
+
+    return {
+        local: true,
+        object
+    }
+}
+
+export function isUriResultLocal(value: UriParseResult): value is UriParseResult & { local: true } {
+    return value.local;
 }

 export default class DbResolver {
@ -68,17 +84,17 @@ export default class DbResolver {
 	 * AP Note => Misskey Note in DB
 	 */
 	public async getNoteFromApId(value: string | IObject): Promise<Note | null> {
-		const parsed = parseUri(value);
+		const parsed = parseApUri(value);

 		if (parsed.local) {
-			if (parsed.type !== "notes") return null;
+			if (parsed.object.type !== "Note") return null;

 			return await Notes.findOneBy({
-				id: parsed.id,
+				id: parsed.object.id,
 			});
 		} else {
 			return await Notes.findOneBy({
-				uri: parsed.uri,
+				uri: parsed.uri.href,
 			});
 		}
 	}
@ -89,22 +105,22 @@ export default class DbResolver {
 	public async getUserFromApId(
 		value: string | IObject,
 	): Promise<CacheableUser | null> {
-		const parsed = parseUri(value);
+		const parsed = parseApUri(value);

 		if (parsed.local) {
-			if (parsed.type !== "users") return null;
+			if (parsed.object.type !== "User") return null;

 			return (
-				(await userByIdCache.fetchMaybe(parsed.id, () =>
+				(await userByIdCache.fetchMaybe(parsed.object.id, () =>
 					Users.findOneBy({
-						id: parsed.id,
+						id: parsed.object.id,
 					}).then((x) => x ?? undefined),
 				)) ?? null
 			);
 		} else {
-			return await uriPersonCache.fetch(parsed.uri, () =>
+			return await uriPersonCache.fetch(parsed.uri.href, () =>
 				Users.findOneBy({
-					uri: parsed.uri,
+					uri: parsed.uri.href,
 				}),
 			);
 		}
--- a/packages/backend/src/remote/activitypub/kernel/accept/follow.ts
+++ b/packages/backend/src/remote/activitypub/kernel/accept/follow.ts
@ -2,7 +2,6 @@ import type { CacheableRemoteUser } from "@/models/entities/user.js";
 import accept from "@/services/following/requests/accept.js";
 import type {IFollow} from "../../type.js";
 import DbResolver from "../../db-resolver.js";
-import { relayAccepted } from "@/services/relay.js";

 export default async (
 	actor: CacheableRemoteUser,
@ -21,12 +20,6 @@ export default async (
 		return "skip: follower is not a local user";
 	}

-	// relay
-	const match = activity.id?.match(/follow-relay\/(\w+)/);
-	if (match) {
-		return await relayAccepted(match[1]);
-	}
-
 	await accept(actor, follower);
 	return "ok";
 };
--- a/packages/backend/src/remote/activitypub/kernel/flag/index.ts
+++ b/packages/backend/src/remote/activitypub/kernel/flag/index.ts
@ -1,10 +1,10 @@
 import type {CacheableRemoteUser} from "@/models/entities/user.js";
-import config from "@/config/index.js";
 import type {IFlag} from "../../type.js";
 import {getApIds} from "../../type.js";
 import {AbuseUserReports, Users} from "@/models/index.js";
 import {In} from "typeorm";
 import {genId} from "@/misc/gen-id.js";
+import {isUriResultLocal, parseApUri} from "@/remote/activitypub/db-resolver";

 export default async (
 	actor: CacheableRemoteUser,
@ -15,9 +15,11 @@ export default async (
 	// user and it is stored as a comment.
 	const uris = getApIds(activity.object);

-	const userIds = uris
-		.filter((uri) => uri.startsWith(`${config.url}/users/`))
-		.map((uri) => uri.split("/").pop()!);
+	const userIds = uris.map(parseApUri)
+		.filter(isUriResultLocal)
+        .filter(obj => obj.object.type === "User")
+        .map(user => user.object.id);
+
 	const users = await Users.findBy({
 		id: In(userIds),
 	});
--- a/packages/backend/src/remote/activitypub/kernel/index.ts
+++ b/packages/backend/src/remote/activitypub/kernel/index.ts
@ -1,27 +1,23 @@
 import type {CacheableRemoteUser} from "@/models/entities/user.js";
-import { toArray } from "@/prelude/array.js";
+import type {IObject} from "../type.js";
 import {
+    getApId,
+    isAccept,
+    isAdd,
+    isAnnounce,
+    isBlock,
    isCreate,
    isDelete,
-	isUpdate,
-	isRead,
-	isFollow,
-	isAccept,
-	isReject,
-	isAdd,
-	isRemove,
-	isAnnounce,
-	isLike,
-	isUndo,
-	isBlock,
-	isCollectionOrOrderedCollection,
-	isCollection,
    isFlag,
+    isFollow,
+    isLike,
    isMove,
-	getApId,
+    isReject,
+    isRemove,
+    isUndo,
+    isUpdate,
 } from "../type.js";
 import {apLogger} from "../logger.js";
-import Resolver from "../resolver.js";
 import create from "./create/index.js";
 import performDeleteActivity from "./delete/index.js";
 import performUpdateActivity from "./update/index.js";
@ -36,43 +32,17 @@ import remove from "./remove/index.js";
 import block from "./block/index.js";
 import flag from "./flag/index.js";
 import move from "./move/index.js";
-import type { IObject } from "../type.js";
 import {extractDbHost} from "@/misc/convert-host.js";
 import {shouldBlockInstance} from "@/misc/should-block-instance.js";

 export async function performActivity(
 	actor: CacheableRemoteUser,
 	activity: IObject,
-) {
-	if (isCollectionOrOrderedCollection(activity)) {
-		const resolver = new Resolver();
-		for (const item of toArray(
-			isCollection(activity) ? activity.items : activity.orderedItems,
-		)) {
-			const act = await resolver.resolve(item);
-			try {
-				await performOneActivity(actor, act);
-			} catch (err) {
-				if (err instanceof Error || typeof err === "string") {
-					apLogger.error(err);
-				}
-			}
-		}
-	} else {
-		await performOneActivity(actor, activity);
-	}
-}
-
-async function performOneActivity(
-	actor: CacheableRemoteUser,
-	activity: IObject,
 ): Promise<void> {
 	if (actor.isSuspended) return;

-	if (typeof activity.id !== "undefined") {
    const host = extractDbHost(getApId(activity));
    if (await shouldBlockInstance(host)) return;
-	}

 	if (isCreate(activity)) {
 		await create(actor, activity);
--- a/packages/backend/src/remote/activitypub/kernel/reject/follow.ts
+++ b/packages/backend/src/remote/activitypub/kernel/reject/follow.ts
@ -2,7 +2,6 @@ import type { CacheableRemoteUser } from "@/models/entities/user.js";
 import {remoteReject} from "@/services/following/reject.js";
 import type {IFollow} from "../../type.js";
 import DbResolver from "../../db-resolver.js";
-import { relayRejected } from "@/services/relay.js";
 import {Users} from "@/models/index.js";

 export default async (
@ -22,12 +21,6 @@ export default async (
 		return "skip: follower is not a local user";
 	}

-	// relay
-	const match = activity.id?.match(/follow-relay\/(\w+)/);
-	if (match) {
-		return await relayRejected(match[1]);
-	}
-
 	await remoteReject(actor, follower);
 	return "ok";
 };
--- a/packages/backend/src/remote/activitypub/misc/contexts.ts
+++ b/packages/backend/src/remote/activitypub/misc/contexts.ts
@ -1,525 +0,0 @@
-const id_v1 = {
-	"@context": {
-		id: "@id",
-		type: "@type",
-
-		cred: "https://w3id.org/credentials#",
-		dc: "http://purl.org/dc/terms/",
-		identity: "https://w3id.org/identity#",
-		perm: "https://w3id.org/permissions#",
-		ps: "https://w3id.org/payswarm#",
-		rdf: "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
-		rdfs: "http://www.w3.org/2000/01/rdf-schema#",
-		sec: "https://w3id.org/security#",
-		schema: "http://schema.org/",
-		xsd: "http://www.w3.org/2001/XMLSchema#",
-
-		Group: "https://www.w3.org/ns/activitystreams#Group",
-
-		claim: { "@id": "cred:claim", "@type": "@id" },
-		credential: { "@id": "cred:credential", "@type": "@id" },
-		issued: { "@id": "cred:issued", "@type": "xsd:dateTime" },
-		issuer: { "@id": "cred:issuer", "@type": "@id" },
-		recipient: { "@id": "cred:recipient", "@type": "@id" },
-		Credential: "cred:Credential",
-		CryptographicKeyCredential: "cred:CryptographicKeyCredential",
-
-		about: { "@id": "schema:about", "@type": "@id" },
-		address: { "@id": "schema:address", "@type": "@id" },
-		addressCountry: "schema:addressCountry",
-		addressLocality: "schema:addressLocality",
-		addressRegion: "schema:addressRegion",
-		comment: "rdfs:comment",
-		created: { "@id": "dc:created", "@type": "xsd:dateTime" },
-		creator: { "@id": "dc:creator", "@type": "@id" },
-		description: "schema:description",
-		email: "schema:email",
-		familyName: "schema:familyName",
-		givenName: "schema:givenName",
-		image: { "@id": "schema:image", "@type": "@id" },
-		label: "rdfs:label",
-		name: "schema:name",
-		postalCode: "schema:postalCode",
-		streetAddress: "schema:streetAddress",
-		title: "dc:title",
-		url: { "@id": "schema:url", "@type": "@id" },
-		Person: "schema:Person",
-		PostalAddress: "schema:PostalAddress",
-		Organization: "schema:Organization",
-
-		identityService: { "@id": "identity:identityService", "@type": "@id" },
-		idp: { "@id": "identity:idp", "@type": "@id" },
-		Identity: "identity:Identity",
-
-		paymentProcessor: "ps:processor",
-		preferences: { "@id": "ps:preferences", "@type": "@vocab" },
-
-		cipherAlgorithm: "sec:cipherAlgorithm",
-		cipherData: "sec:cipherData",
-		cipherKey: "sec:cipherKey",
-		digestAlgorithm: "sec:digestAlgorithm",
-		digestValue: "sec:digestValue",
-		domain: "sec:domain",
-		expires: { "@id": "sec:expiration", "@type": "xsd:dateTime" },
-		initializationVector: "sec:initializationVector",
-		member: { "@id": "schema:member", "@type": "@id" },
-		memberOf: { "@id": "schema:memberOf", "@type": "@id" },
-		nonce: "sec:nonce",
-		normalizationAlgorithm: "sec:normalizationAlgorithm",
-		owner: { "@id": "sec:owner", "@type": "@id" },
-		password: "sec:password",
-		privateKey: { "@id": "sec:privateKey", "@type": "@id" },
-		privateKeyPem: "sec:privateKeyPem",
-		publicKey: { "@id": "sec:publicKey", "@type": "@id" },
-		publicKeyPem: "sec:publicKeyPem",
-		publicKeyService: { "@id": "sec:publicKeyService", "@type": "@id" },
-		revoked: { "@id": "sec:revoked", "@type": "xsd:dateTime" },
-		signature: "sec:signature",
-		signatureAlgorithm: "sec:signatureAlgorithm",
-		signatureValue: "sec:signatureValue",
-		CryptographicKey: "sec:Key",
-		EncryptedMessage: "sec:EncryptedMessage",
-		GraphSignature2012: "sec:GraphSignature2012",
-		LinkedDataSignature2015: "sec:LinkedDataSignature2015",
-
-		accessControl: { "@id": "perm:accessControl", "@type": "@id" },
-		writePermission: { "@id": "perm:writePermission", "@type": "@id" },
-	},
-};
-
-const security_v1 = {
-	"@context": {
-		id: "@id",
-		type: "@type",
-
-		dc: "http://purl.org/dc/terms/",
-		sec: "https://w3id.org/security#",
-		xsd: "http://www.w3.org/2001/XMLSchema#",
-
-		EcdsaKoblitzSignature2016: "sec:EcdsaKoblitzSignature2016",
-		Ed25519Signature2018: "sec:Ed25519Signature2018",
-		EncryptedMessage: "sec:EncryptedMessage",
-		GraphSignature2012: "sec:GraphSignature2012",
-		LinkedDataSignature2015: "sec:LinkedDataSignature2015",
-		LinkedDataSignature2016: "sec:LinkedDataSignature2016",
-		CryptographicKey: "sec:Key",
-
-		authenticationTag: "sec:authenticationTag",
-		canonicalizationAlgorithm: "sec:canonicalizationAlgorithm",
-		cipherAlgorithm: "sec:cipherAlgorithm",
-		cipherData: "sec:cipherData",
-		cipherKey: "sec:cipherKey",
-		created: { "@id": "dc:created", "@type": "xsd:dateTime" },
-		creator: { "@id": "dc:creator", "@type": "@id" },
-		digestAlgorithm: "sec:digestAlgorithm",
-		digestValue: "sec:digestValue",
-		domain: "sec:domain",
-		encryptionKey: "sec:encryptionKey",
-		expiration: { "@id": "sec:expiration", "@type": "xsd:dateTime" },
-		expires: { "@id": "sec:expiration", "@type": "xsd:dateTime" },
-		initializationVector: "sec:initializationVector",
-		iterationCount: "sec:iterationCount",
-		nonce: "sec:nonce",
-		normalizationAlgorithm: "sec:normalizationAlgorithm",
-		owner: { "@id": "sec:owner", "@type": "@id" },
-		password: "sec:password",
-		privateKey: { "@id": "sec:privateKey", "@type": "@id" },
-		privateKeyPem: "sec:privateKeyPem",
-		publicKey: { "@id": "sec:publicKey", "@type": "@id" },
-		publicKeyBase58: "sec:publicKeyBase58",
-		publicKeyPem: "sec:publicKeyPem",
-		publicKeyWif: "sec:publicKeyWif",
-		publicKeyService: { "@id": "sec:publicKeyService", "@type": "@id" },
-		revoked: { "@id": "sec:revoked", "@type": "xsd:dateTime" },
-		salt: "sec:salt",
-		signature: "sec:signature",
-		signatureAlgorithm: "sec:signingAlgorithm",
-		signatureValue: "sec:signatureValue",
-	},
-};
-
-const activitystreams = {
-	"@context": {
-		"@vocab": "_:",
-		xsd: "http://www.w3.org/2001/XMLSchema#",
-		as: "https://www.w3.org/ns/activitystreams#",
-		ldp: "http://www.w3.org/ns/ldp#",
-		vcard: "http://www.w3.org/2006/vcard/ns#",
-		id: "@id",
-		type: "@type",
-		Accept: "as:Accept",
-		Activity: "as:Activity",
-		IntransitiveActivity: "as:IntransitiveActivity",
-		Add: "as:Add",
-		Announce: "as:Announce",
-		Application: "as:Application",
-		Arrive: "as:Arrive",
-		Article: "as:Article",
-		Audio: "as:Audio",
-		Block: "as:Block",
-		Collection: "as:Collection",
-		CollectionPage: "as:CollectionPage",
-		Relationship: "as:Relationship",
-		Create: "as:Create",
-		Delete: "as:Delete",
-		Dislike: "as:Dislike",
-		Document: "as:Document",
-		Event: "as:Event",
-		Follow: "as:Follow",
-		Flag: "as:Flag",
-		Group: "as:Group",
-		Ignore: "as:Ignore",
-		Image: "as:Image",
-		Invite: "as:Invite",
-		Join: "as:Join",
-		Leave: "as:Leave",
-		Like: "as:Like",
-		Link: "as:Link",
-		Mention: "as:Mention",
-		Note: "as:Note",
-		Object: "as:Object",
-		Offer: "as:Offer",
-		OrderedCollection: "as:OrderedCollection",
-		OrderedCollectionPage: "as:OrderedCollectionPage",
-		Organization: "as:Organization",
-		Page: "as:Page",
-		Person: "as:Person",
-		Place: "as:Place",
-		Profile: "as:Profile",
-		Question: "as:Question",
-		Reject: "as:Reject",
-		Remove: "as:Remove",
-		Service: "as:Service",
-		TentativeAccept: "as:TentativeAccept",
-		TentativeReject: "as:TentativeReject",
-		Tombstone: "as:Tombstone",
-		Undo: "as:Undo",
-		Update: "as:Update",
-		Video: "as:Video",
-		View: "as:View",
-		Listen: "as:Listen",
-		Read: "as:Read",
-		Move: "as:Move",
-		Travel: "as:Travel",
-		IsFollowing: "as:IsFollowing",
-		IsFollowedBy: "as:IsFollowedBy",
-		IsContact: "as:IsContact",
-		IsMember: "as:IsMember",
-		subject: {
-			"@id": "as:subject",
-			"@type": "@id",
-		},
-		relationship: {
-			"@id": "as:relationship",
-			"@type": "@id",
-		},
-		actor: {
-			"@id": "as:actor",
-			"@type": "@id",
-		},
-		attributedTo: {
-			"@id": "as:attributedTo",
-			"@type": "@id",
-		},
-		attachment: {
-			"@id": "as:attachment",
-			"@type": "@id",
-		},
-		bcc: {
-			"@id": "as:bcc",
-			"@type": "@id",
-		},
-		bto: {
-			"@id": "as:bto",
-			"@type": "@id",
-		},
-		cc: {
-			"@id": "as:cc",
-			"@type": "@id",
-		},
-		context: {
-			"@id": "as:context",
-			"@type": "@id",
-		},
-		current: {
-			"@id": "as:current",
-			"@type": "@id",
-		},
-		first: {
-			"@id": "as:first",
-			"@type": "@id",
-		},
-		generator: {
-			"@id": "as:generator",
-			"@type": "@id",
-		},
-		icon: {
-			"@id": "as:icon",
-			"@type": "@id",
-		},
-		image: {
-			"@id": "as:image",
-			"@type": "@id",
-		},
-		inReplyTo: {
-			"@id": "as:inReplyTo",
-			"@type": "@id",
-		},
-		items: {
-			"@id": "as:items",
-			"@type": "@id",
-		},
-		instrument: {
-			"@id": "as:instrument",
-			"@type": "@id",
-		},
-		orderedItems: {
-			"@id": "as:items",
-			"@type": "@id",
-			"@container": "@list",
-		},
-		last: {
-			"@id": "as:last",
-			"@type": "@id",
-		},
-		location: {
-			"@id": "as:location",
-			"@type": "@id",
-		},
-		next: {
-			"@id": "as:next",
-			"@type": "@id",
-		},
-		object: {
-			"@id": "as:object",
-			"@type": "@id",
-		},
-		oneOf: {
-			"@id": "as:oneOf",
-			"@type": "@id",
-		},
-		anyOf: {
-			"@id": "as:anyOf",
-			"@type": "@id",
-		},
-		closed: {
-			"@id": "as:closed",
-			"@type": "xsd:dateTime",
-		},
-		origin: {
-			"@id": "as:origin",
-			"@type": "@id",
-		},
-		accuracy: {
-			"@id": "as:accuracy",
-			"@type": "xsd:float",
-		},
-		prev: {
-			"@id": "as:prev",
-			"@type": "@id",
-		},
-		preview: {
-			"@id": "as:preview",
-			"@type": "@id",
-		},
-		replies: {
-			"@id": "as:replies",
-			"@type": "@id",
-		},
-		result: {
-			"@id": "as:result",
-			"@type": "@id",
-		},
-		audience: {
-			"@id": "as:audience",
-			"@type": "@id",
-		},
-		partOf: {
-			"@id": "as:partOf",
-			"@type": "@id",
-		},
-		tag: {
-			"@id": "as:tag",
-			"@type": "@id",
-		},
-		target: {
-			"@id": "as:target",
-			"@type": "@id",
-		},
-		to: {
-			"@id": "as:to",
-			"@type": "@id",
-		},
-		url: {
-			"@id": "as:url",
-			"@type": "@id",
-		},
-		altitude: {
-			"@id": "as:altitude",
-			"@type": "xsd:float",
-		},
-		content: "as:content",
-		contentMap: {
-			"@id": "as:content",
-			"@container": "@language",
-		},
-		name: "as:name",
-		nameMap: {
-			"@id": "as:name",
-			"@container": "@language",
-		},
-		duration: {
-			"@id": "as:duration",
-			"@type": "xsd:duration",
-		},
-		endTime: {
-			"@id": "as:endTime",
-			"@type": "xsd:dateTime",
-		},
-		height: {
-			"@id": "as:height",
-			"@type": "xsd:nonNegativeInteger",
-		},
-		href: {
-			"@id": "as:href",
-			"@type": "@id",
-		},
-		hreflang: "as:hreflang",
-		latitude: {
-			"@id": "as:latitude",
-			"@type": "xsd:float",
-		},
-		longitude: {
-			"@id": "as:longitude",
-			"@type": "xsd:float",
-		},
-		mediaType: "as:mediaType",
-		published: {
-			"@id": "as:published",
-			"@type": "xsd:dateTime",
-		},
-		radius: {
-			"@id": "as:radius",
-			"@type": "xsd:float",
-		},
-		rel: "as:rel",
-		startIndex: {
-			"@id": "as:startIndex",
-			"@type": "xsd:nonNegativeInteger",
-		},
-		startTime: {
-			"@id": "as:startTime",
-			"@type": "xsd:dateTime",
-		},
-		summary: "as:summary",
-		summaryMap: {
-			"@id": "as:summary",
-			"@container": "@language",
-		},
-		totalItems: {
-			"@id": "as:totalItems",
-			"@type": "xsd:nonNegativeInteger",
-		},
-		units: "as:units",
-		updated: {
-			"@id": "as:updated",
-			"@type": "xsd:dateTime",
-		},
-		width: {
-			"@id": "as:width",
-			"@type": "xsd:nonNegativeInteger",
-		},
-		describes: {
-			"@id": "as:describes",
-			"@type": "@id",
-		},
-		formerType: {
-			"@id": "as:formerType",
-			"@type": "@id",
-		},
-		deleted: {
-			"@id": "as:deleted",
-			"@type": "xsd:dateTime",
-		},
-		inbox: {
-			"@id": "ldp:inbox",
-			"@type": "@id",
-		},
-		outbox: {
-			"@id": "as:outbox",
-			"@type": "@id",
-		},
-		following: {
-			"@id": "as:following",
-			"@type": "@id",
-		},
-		followers: {
-			"@id": "as:followers",
-			"@type": "@id",
-		},
-		streams: {
-			"@id": "as:streams",
-			"@type": "@id",
-		},
-		preferredUsername: "as:preferredUsername",
-		endpoints: {
-			"@id": "as:endpoints",
-			"@type": "@id",
-		},
-		uploadMedia: {
-			"@id": "as:uploadMedia",
-			"@type": "@id",
-		},
-		proxyUrl: {
-			"@id": "as:proxyUrl",
-			"@type": "@id",
-		},
-		liked: {
-			"@id": "as:liked",
-			"@type": "@id",
-		},
-		oauthAuthorizationEndpoint: {
-			"@id": "as:oauthAuthorizationEndpoint",
-			"@type": "@id",
-		},
-		oauthTokenEndpoint: {
-			"@id": "as:oauthTokenEndpoint",
-			"@type": "@id",
-		},
-		provideClientKey: {
-			"@id": "as:provideClientKey",
-			"@type": "@id",
-		},
-		signClientKey: {
-			"@id": "as:signClientKey",
-			"@type": "@id",
-		},
-		sharedInbox: {
-			"@id": "as:sharedInbox",
-			"@type": "@id",
-		},
-		Public: {
-			"@id": "as:Public",
-			"@type": "@id",
-		},
-		source: "as:source",
-		likes: {
-			"@id": "as:likes",
-			"@type": "@id",
-		},
-		shares: {
-			"@id": "as:shares",
-			"@type": "@id",
-		},
-		alsoKnownAs: {
-			"@id": "as:alsoKnownAs",
-			"@type": "@id",
-		},
-	},
-};
-
-export const CONTEXTS: Record<string, unknown> = {
-	"https://w3id.org/identity/v1": id_v1,
-	"https://w3id.org/security/v1": security_v1,
-	"https://www.w3.org/ns/activitystreams": activitystreams,
-};
--- a/packages/backend/src/remote/activitypub/misc/ld-signature.ts
+++ b/packages/backend/src/remote/activitypub/misc/ld-signature.ts
@ -1,141 +0,0 @@
-import * as crypto from "node:crypto";
-import jsonld from "jsonld";
-import { CONTEXTS } from "./contexts.js";
-import fetch from "node-fetch";
-import { httpAgent, httpsAgent } from "@/misc/fetch.js";
-
-// RsaSignature2017 based from https://github.com/transmute-industries/RsaSignature2017
-
-export class LdSignature {
-	public debug = false;
-	public preLoad = true;
-	public loderTimeout = 10 * 1000;
-
-	public async signRsaSignature2017(
-		data: any,
-		privateKey: string,
-		creator: string,
-		domain?: string,
-		created?: Date,
-	): Promise<any> {
-		const options = {
-			type: "RsaSignature2017",
-			creator,
-			domain,
-			nonce: crypto.randomBytes(16).toString("hex"),
-			created: (created || new Date()).toISOString(),
-		} as {
-			type: string;
-			creator: string;
-			domain?: string;
-			nonce: string;
-			created: string;
-		};
-
-		if (!domain) {
-			options.domain = undefined;
-		}
-
-		const toBeSigned = await this.createVerifyData(data, options);
-
-		const signer = crypto.createSign("sha256");
-		signer.update(toBeSigned);
-		signer.end();
-
-		const signature = signer.sign(privateKey);
-
-		return {
-			...data,
-			signature: {
-				...options,
-				signatureValue: signature.toString("base64"),
-			},
-		};
-	}
-
-	public async verifyRsaSignature2017(
-		data: any,
-		publicKey: string,
-	): Promise<boolean> {
-		const toBeSigned = await this.createVerifyData(data, data.signature);
-		const verifier = crypto.createVerify("sha256");
-		verifier.update(toBeSigned);
-		return verifier.verify(publicKey, data.signature.signatureValue, "base64");
-	}
-
-	public async createVerifyData(data: any, options: any) {
-		const transformedOptions = {
-			...options,
-			"@context": "https://w3id.org/identity/v1",
-		};
-		delete transformedOptions["type"];
-		delete transformedOptions["id"];
-		delete transformedOptions["signatureValue"];
-		const canonizedOptions = await this.normalize(transformedOptions);
-		const optionsHash = this.sha256(canonizedOptions);
-		const transformedData = { ...data };
-		delete transformedData["signature"];
-		const cannonidedData = await this.normalize(transformedData);
-		if (this.debug) console.debug(`cannonidedData: ${cannonidedData}`);
-		const documentHash = this.sha256(cannonidedData);
-		const verifyData = `${optionsHash}${documentHash}`;
-		return verifyData;
-	}
-
-	public async normalize(data: any) {
-		const customLoader = this.getLoader();
-		return await jsonld.normalize(data, {
-			documentLoader: customLoader,
-		});
-	}
-
-	private getLoader() {
-		return async (url: string): Promise<any> => {
-			if (!url.match("^https?://")) throw new Error(`Invalid URL ${url}`);
-
-			if (this.preLoad) {
-				if (url in CONTEXTS) {
-					if (this.debug) console.debug(`HIT: ${url}`);
-					return {
-						contextUrl: null,
-						document: CONTEXTS[url],
-						documentUrl: url,
-					};
-				}
-			}
-
-			if (this.debug) console.debug(`MISS: ${url}`);
-			const document = await this.fetchDocument(url);
-			return {
-				contextUrl: null,
-				document: document,
-				documentUrl: url,
-			};
-		};
-	}
-
-	private async fetchDocument(url: string) {
-		const json = await fetch(url, {
-			headers: {
-				Accept: "application/ld+json, application/json",
-			},
-			// TODO
-			//timeout: this.loderTimeout,
-			agent: (u) => (u.protocol === "http:" ? httpAgent : httpsAgent),
-		}).then((res) => {
-			if (!res.ok) {
-				throw new Error(`${res.status} ${res.statusText}`);
-			} else {
-				return res.json();
-			}
-		});
-
-		return json;
-	}
-
-	public sha256(data: string): string {
-		const hash = crypto.createHash("sha256");
-		hash.update(data);
-		return hash.digest("hex");
-	}
-}
--- a/packages/backend/src/remote/activitypub/perform.ts
+++ b/packages/backend/src/remote/activitypub/perform.ts
@ -1,23 +0,0 @@
-import type { IObject } from "./type.js";
-import type { CacheableRemoteUser } from "@/models/entities/user.js";
-import { performActivity } from "./kernel/index.js";
-import { updatePerson } from "./models/person.js";
-
-export default async (
-	actor: CacheableRemoteUser,
-	activity: IObject,
-): Promise<void> => {
-	await performActivity(actor, activity);
-
-	// Update the remote user information if it is out of date
-	if (actor.uri) {
-		if (
-			actor.lastFetchedAt == null ||
-			Date.now() - actor.lastFetchedAt.getTime() > 1000 * 60 * 60 * 24
-		) {
-			setImmediate(() => {
-				updatePerson(actor.uri!);
-			});
-		}
-	}
-};
--- a/packages/backend/src/remote/activitypub/renderer/follow-relay.ts
+++ b/packages/backend/src/remote/activitypub/renderer/follow-relay.ts
@ -1,14 +0,0 @@
-import config from "@/config/index.js";
-import type { Relay } from "@/models/entities/relay.js";
-import type { ILocalUser } from "@/models/entities/user.js";
-
-export function renderFollowRelay(relay: Relay, relayActor: ILocalUser) {
-	const follow = {
-		id: `${config.url}/activities/follow-relay/${relay.id}`,
-		type: "Follow",
-		actor: `${config.url}/users/${relayActor.id}`,
-		object: "https://www.w3.org/ns/activitystreams#Public",
-	};
-
-	return follow;
-}
--- a/packages/backend/src/remote/activitypub/renderer/index.ts
+++ b/packages/backend/src/remote/activitypub/renderer/index.ts
@ -1,14 +1,17 @@
 import {v4 as uuid} from "uuid";
 import config from "@/config/index.js";
-import { getUserKeypair } from "@/misc/keypair-store.js";
-import type { User } from "@/models/entities/user.js";
-import { LdSignature } from "../misc/ld-signature.js";
 import type {IActivity} from "../type.js";

+/**
+ * Unfortunately named function that adds a context to AP objects
+ *
+ * @param x An input AP object
+ */
 export const renderActivity = (x: any): IActivity | null => {
 	if (x == null) return null;

 	if (typeof x === "object" && x.id == null) {
+        // ???
 		x.id = `${config.url}/${uuid()}`;
 	}

@ -52,22 +55,3 @@ export const renderActivity = (x: any): IActivity | null => {
 		x,
 	);
 };
-
-export const attachLdSignature = async (
-	activity: any,
-	user: { id: User["id"]; host: null },
-): Promise<IActivity | null> => {
-	if (activity == null) return null;
-
-	const keypair = await getUserKeypair(user.id);
-
-	const ldSignature = new LdSignature();
-	ldSignature.debug = false;
-	activity = await ldSignature.signRsaSignature2017(
-		activity,
-		keypair.privateKey,
-		`${config.url}/users/${user.id}#main-key`,
-	);
-
-	return activity;
-};
--- a/packages/backend/src/remote/activitypub/renderer/note.ts
+++ b/packages/backend/src/remote/activitypub/renderer/note.ts
@ -1,8 +1,8 @@
 import {In, IsNull} from "typeorm";
 import config from "@/config/index.js";
-import type { Note, IMentionedRemoteUsers } from "@/models/entities/note.js";
+import type {IMentionedRemoteUsers, Note} from "@/models/entities/note.js";
 import type {DriveFile} from "@/models/entities/drive-file.js";
-import { DriveFiles, Notes, Users, Emojis, Polls } from "@/models/index.js";
+import {DriveFiles, Emojis, Notes, Polls, Users} from "@/models/index.js";
 import type {Emoji} from "@/models/entities/emoji.js";
 import type {Poll} from "@/models/entities/poll.js";
 import toHtml from "../misc/get-note-html.js";
@ -14,7 +14,6 @@ import renderDocument from "./document.js";
 export default async function renderNote(
 	note: Note,
 	dive = true,
-	isTalk = false,
 ): Promise<Record<string, unknown>> {
 	const getPromisedFiles = async (ids: string[]) => {
 		if (!ids || ids.length === 0) return [];
@ -140,12 +139,6 @@ export default async function renderNote(
 		  }
 		: {};

-	const asTalk = isTalk
-		? {
-				_misskey_talk: true,
-		  }
-		: {};
-
 	return {
 		id: `${config.url}/notes/${note.id}`,
 		type: "Note",
@ -168,7 +161,6 @@ export default async function renderNote(
 		sensitive: note.cw != null || files.some((file) => file.isSensitive),
 		tag,
 		...asPoll,
-		...asTalk,
 	};
 }

--- a/packages/backend/src/remote/activitypub/resolver.ts
+++ b/packages/backend/src/remote/activitypub/resolver.ts
@ -4,10 +4,16 @@ import {getInstanceActor} from "@/services/instance-actor.js";
 import {fetchMeta} from "@/misc/fetch-meta.js";
 import {extractDbHost, isSelfHost} from "@/misc/convert-host.js";
 import {signedGet} from "./request.js";
-import type {ICollection, IObject, IOrderedCollection} from "./type.js";
-import {getApId, isCollectionOrOrderedCollection} from "./type.js";
+import {
+    getApId,
+    ICollection,
+    IObject,
+    IOrderedCollection,
+    isCollectionOrOrderedCollection,
+    isLdApContext
+} from "./type.js";
 import {NoteReactions, Notes, Polls, Users,} from "@/models/index.js";
-import {parseUri} from "./db-resolver.js";
+import {parseApUri} from "./db-resolver.js";
 import renderNote from "@/remote/activitypub/renderer/note.js";
 import {renderLike} from "@/remote/activitypub/renderer/like.js";
 import {renderPerson} from "@/remote/activitypub/renderer/person.js";
@ -76,7 +82,11 @@ export default class Resolver {

 		const host = extractDbHost(value);
 		if (isSelfHost(host)) {
-			return await this.resolveLocal(value);
+            const rendered = await this.resolveLocal(value);
+            if (rendered == null) {
+                throw new Error("Invalid locally rendered AP object");
+            }
+			return rendered;
 		}

 		const meta = await fetchMeta();
@ -98,62 +108,53 @@ export default class Resolver {

 		const object = await signedGet(value, this.user);

-		if (
-			object == null ||
-			(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");
+        if (!isLdApContext(object)) {
+            throw new Error("Invalid AP fetch response");
        }

 		return object;
 	}

-	private resolveLocal(url: string): Promise<IObject> {
-		const parsed = parseUri(url);
+	private async resolveLocal(url: string): Promise<IObject | null> {
+		const parsed = parseApUri(url);
 		if (!parsed.local) throw new Error("resolveLocal: not local");

-		switch (parsed.type) {
-			case "notes":
-				return Notes.findOneByOrFail({ id: parsed.id }).then((note) => {
-					if (parsed.rest === "activity") {
-						// this refers to the create activity and not the note itself
-						return renderActivity(renderCreate(renderNote(note)));
-					} else {
-						return renderNote(note);
-					}
-				});
-			case "users":
-				return Users.findOneByOrFail({ id: parsed.id }).then((user) =>
-					renderPerson(user as ILocalUser),
+		switch (parsed.object.type) {
+			case "NoteActivity":
+				return Notes.findOneByOrFail({ id: parsed.object.id }).then((note) =>
+                    renderActivity(renderCreate(renderNote(note, false), note))
 				);
-			case "questions":
+			case "Note":
+				return Notes.findOneByOrFail({ id: parsed.object.id }).then((note) =>
+                    renderActivity(renderNote(note))
+				);
+			case "User":
+				return Users.findOneByOrFail({ id: parsed.object.id }).then((user) =>
+					renderActivity(renderPerson(user as ILocalUser))
+				);
+			case "Question":
 				// Polls are indexed by the note they are attached to.
 				return Promise.all([
-					Notes.findOneByOrFail({ id: parsed.id }),
-					Polls.findOneByOrFail({ noteId: parsed.id }),
+					Notes.findOneByOrFail({ id: parsed.object.id }),
+					Polls.findOneByOrFail({ noteId: parsed.object.id }),
 				]).then(([note, poll]) =>
-					renderQuestion({ id: note.userId }, note, poll),
+                    renderActivity(renderQuestion({id: note.userId}, note, poll)),
 				);
-			case "likes":
-				return NoteReactions.findOneByOrFail({ id: parsed.id }).then(
-					(reaction) => renderActivity(renderLike(reaction, { uri: null })),
+			case "Like":
+                return Promise.all([
+                    Notes.findOneByOrFail({ id: parsed.object.id }),
+                    NoteReactions.findOneByOrFail({ id: parsed.object.id })
+                ]).then(
+					([note, reaction]) => renderActivity(renderLike(reaction, note)),
 				);
-			case "follows":
-				// rest should be <followee id>
-				if (parsed.rest == null || !/^\w+$/.test(parsed.rest))
-					throw new Error("resolveLocal: invalid follow URI");
-
+			case "Follow":
 				return Promise.all(
-					[parsed.id, parsed.rest].map((id) => Users.findOneByOrFail({ id })),
+                    [parsed.object.id, parsed.object.followeeId].map(
+                        (id) => Users.findOneByOrFail({ id })
+                    )
 				).then(([follower, followee]) =>
 					renderActivity(renderFollow(follower, followee, url)),
 				);
-			default:
-				throw new Error(`resolveLocal: type ${type} unhandled`);
 		}
 	}
 }
--- a/packages/backend/src/remote/activitypub/type.ts
+++ b/packages/backend/src/remote/activitypub/type.ts
@ -1,8 +1,7 @@
-export type obj = { [x: string]: any };
 export type ApObject = IObject | string | (IObject | string)[];

 export interface IObject {
-	"@context": string | string[] | obj | obj[];
+	"@context": string | string[] | Record<string, any> | Record<string, any>[];
 	type: string | string[];
 	id?: string;
 	summary?: string;
@ -25,6 +24,19 @@ export interface IObject {
 	sensitive?: boolean;
 }

+export function isLdApContext(object: any): object is IObject {
+    if (object == null || typeof object !== "object") {
+        return false;
+    }
+
+    if (object["@context"] === "https://www.w3.org/ns/activitystreams") {
+        return true;
+    }
+
+    return Array.isArray(object["@context"])
+        && (object["@context"] as unknown[]).includes("https://www.w3.org/ns/activitystreams");
+}
+
 /**
 * Get array of ActivityStreams Objects id
 */
--- a/packages/backend/src/server/api/endpoints.ts
+++ b/packages/backend/src/server/api/endpoints.ts
@ -43,9 +43,6 @@ import * as ep___admin_queue_clear from "./endpoints/admin/queue/clear.js";
 import * as ep___admin_queue_deliverDelayed from "./endpoints/admin/queue/deliver-delayed.js";
 import * as ep___admin_queue_inboxDelayed from "./endpoints/admin/queue/inbox-delayed.js";
 import * as ep___admin_queue_stats from "./endpoints/admin/queue/stats.js";
-import * as ep___admin_relays_add from "./endpoints/admin/relays/add.js";
-import * as ep___admin_relays_list from "./endpoints/admin/relays/list.js";
-import * as ep___admin_relays_remove from "./endpoints/admin/relays/remove.js";
 import * as ep___admin_resetPassword from "./endpoints/admin/reset-password.js";
 import * as ep___admin_resolveAbuseUserReport from "./endpoints/admin/resolve-abuse-user-report.js";
 import * as ep___admin_search_indexAll from "./endpoints/admin/search/index-all.js";
@ -332,9 +329,6 @@ const eps = [
 	["admin/queue/deliver-delayed", ep___admin_queue_deliverDelayed],
 	["admin/queue/inbox-delayed", ep___admin_queue_inboxDelayed],
 	["admin/queue/stats", ep___admin_queue_stats],
-	["admin/relays/add", ep___admin_relays_add],
-	["admin/relays/list", ep___admin_relays_list],
-	["admin/relays/remove", ep___admin_relays_remove],
 	["admin/reset-password", ep___admin_resetPassword],
 	["admin/resolve-abuse-user-report", ep___admin_resolveAbuseUserReport],
 	["admin/search/index-all", ep___admin_search_indexAll],
--- a/packages/backend/src/server/api/endpoints/admin/relays/add.ts
+++ b/packages/backend/src/server/api/endpoints/admin/relays/add.ts
@ -1,65 +0,0 @@
-import { URL } from "node:url";
-import define from "../../../define.js";
-import { addRelay } from "@/services/relay.js";
-import { ApiError } from "../../../error.js";
-
-export const meta = {
-	tags: ["admin"],
-
-	requireCredential: true,
-	requireModerator: true,
-
-	errors: {
-		invalidUrl: {
-			message: "Invalid URL",
-			code: "INVALID_URL",
-			id: "fb8c92d3-d4e5-44e7-b3d4-800d5cef8b2c",
-		},
-	},
-
-	res: {
-		type: "object",
-		optional: false,
-		nullable: false,
-		properties: {
-			id: {
-				type: "string",
-				optional: false,
-				nullable: false,
-				format: "id",
-			},
-			inbox: {
-				description: "URL of the inbox, must be a https scheme URL",
-				type: "string",
-				optional: false,
-				nullable: false,
-				format: "url",
-			},
-			status: {
-				type: "string",
-				optional: false,
-				nullable: false,
-				default: "requesting",
-				enum: ["requesting", "accepted", "rejected"],
-			},
-		},
-	},
-} as const;
-
-export const paramDef = {
-	type: "object",
-	properties: {
-		inbox: { type: "string" },
-	},
-	required: ["inbox"],
-} as const;
-
-export default define(meta, paramDef, async (ps, user) => {
-	try {
-		if (new URL(ps.inbox).protocol !== "https:") throw new Error("https only");
-	} catch {
-		throw new ApiError(meta.errors.invalidUrl);
-	}
-
-	return await addRelay(ps.inbox);
-});
--- a/packages/backend/src/server/api/endpoints/admin/relays/list.ts
+++ b/packages/backend/src/server/api/endpoints/admin/relays/list.ts
@ -1,51 +0,0 @@
-import define from "../../../define.js";
-import { listRelay } from "@/services/relay.js";
-
-export const meta = {
-	tags: ["admin"],
-
-	requireCredential: true,
-	requireModerator: true,
-
-	res: {
-		type: "array",
-		optional: false,
-		nullable: false,
-		items: {
-			type: "object",
-			optional: false,
-			nullable: false,
-			properties: {
-				id: {
-					type: "string",
-					optional: false,
-					nullable: false,
-					format: "id",
-				},
-				inbox: {
-					type: "string",
-					optional: false,
-					nullable: false,
-					format: "url",
-				},
-				status: {
-					type: "string",
-					optional: false,
-					nullable: false,
-					default: "requesting",
-					enum: ["requesting", "accepted", "rejected"],
-				},
-			},
-		},
-	},
-} as const;
-
-export const paramDef = {
-	type: "object",
-	properties: {},
-	required: [],
-} as const;
-
-export default define(meta, paramDef, async (ps, user) => {
-	return await listRelay();
-});
--- a/packages/backend/src/server/api/endpoints/admin/relays/remove.ts
+++ b/packages/backend/src/server/api/endpoints/admin/relays/remove.ts
@ -1,21 +0,0 @@
-import define from "../../../define.js";
-import { removeRelay } from "@/services/relay.js";
-
-export const meta = {
-	tags: ["admin"],
-
-	requireCredential: true,
-	requireModerator: true,
-} as const;
-
-export const paramDef = {
-	type: "object",
-	properties: {
-		inbox: { type: "string" },
-	},
-	required: ["inbox"],
-} as const;
-
-export default define(meta, paramDef, async (ps, user) => {
-	return await removeRelay(ps.inbox);
-});
--- a/packages/backend/src/server/api/endpoints/ap/show.ts
+++ b/packages/backend/src/server/api/endpoints/ap/show.ts
@ -108,6 +108,8 @@ async function fetchAny(
 	// Wait if blocked.
 	if (await shouldBlockInstance(extractDbHost(uri))) return null;

+
+
 	const dbResolver = new DbResolver();

 	const [user, note] = await Promise.all([
--- a/packages/backend/src/server/api/endpoints/notes/edit.ts
+++ b/packages/backend/src/server/api/endpoints/notes/edit.ts
@ -20,7 +20,6 @@ import DeliverManager from "@/remote/activitypub/deliver-manager.js";
 import {renderActivity} from "@/remote/activitypub/renderer/index.js";
 import renderNote from "@/remote/activitypub/renderer/note.js";
 import renderUpdate from "@/remote/activitypub/renderer/update.js";
-import {deliverToRelays} from "@/services/relay.js";
 // import { deliverQuestionUpdate } from "@/services/note/polls/update.js";
 import {fetchMeta} from "@/misc/fetch-meta.js";

@ -617,11 +616,6 @@ export default define(meta, paramDef, async (ps, user) => {
 				dm.addFollowersRecipe();
 			}

-			// Deliver to relays for public posts.
-			if (["public"].includes(note.visibility)) {
-				deliverToRelays(user, activity);
-			}
-
 			// GO!
 			dm.execute();
 		})().then();
--- a/packages/backend/src/services/i/pin.ts
+++ b/packages/backend/src/services/i/pin.ts
@ -9,7 +9,6 @@ import { Notes, UserNotePinings, Users } from "@/models/index.js";
 import type {UserNotePining} from "@/models/entities/user-note-pining.js";
 import {genId} from "@/misc/gen-id.js";
 import {deliverToFollowers} from "@/remote/activitypub/deliver-manager.js";
-import { deliverToRelays } from "../relay.js";

 /**
 * 指定した投稿をピン留めします
@ -114,5 +113,4 @@ export async function deliverPinnedChange(
 	);

 	deliverToFollowers(user, content);
-	deliverToRelays(user, content);
 }
--- a/packages/backend/src/services/i/update.ts
+++ b/packages/backend/src/services/i/update.ts
@ -4,7 +4,6 @@ import { Users } from "@/models/index.js";
 import type {User} from "@/models/entities/user.js";
 import {renderPerson} from "@/remote/activitypub/renderer/person.js";
 import {deliverToFollowers} from "@/remote/activitypub/deliver-manager.js";
-import { deliverToRelays } from "../relay.js";

 export async function publishToFollowers(userId: User["id"]) {
 	const user = await Users.findOneBy({ id: userId });
@ -16,6 +15,5 @@ export async function publishToFollowers(userId: User["id"]) {
 			renderUpdate(await renderPerson(user), user),
 		);
 		deliverToFollowers(user, content);
-		deliverToRelays(user, content);
 	}
 }
--- a/packages/backend/src/services/note/create.ts
+++ b/packages/backend/src/services/note/create.ts
@ -42,7 +42,6 @@ import {checkHitAntenna} from "@/misc/check-hit-antenna.js";
 import {getWordHardMute} from "@/misc/check-word-mute.js";
 import {addNoteToAntenna} from "../add-note-to-antenna.js";
 import {countSameRenotes} from "@/misc/count-same-renotes.js";
-import {deliverToRelays, getCachedRelays} from "../relay.js";
 import {normalizeForSearch} from "@/misc/normalize-for-search.js";
 import {getAntennas} from "@/misc/antenna-cache.js";
 import {endedPollNotificationQueue} from "@/queue/queues.js";
@ -402,39 +401,10 @@ export default async (
 			}

 			if (!dontFederateInitially) {
-				const relays = await getCachedRelays();
-				// Some relays (e.g., aode-relay) deliver posts by boosting them as
-				// Announce activities. In that case, user is the relay's actor.
-				const boostedByRelay =
-					!!user.inbox &&
-					relays.map((relay) => relay.inbox).includes(user.inbox);
-
 				if (!note.uri) {
 					// Publish if the post is local
 					publishNotesStream(note);
-				} else if (boostedByRelay && data.renote?.uri) {
-					// Use Redis transaction for atomicity
-					await redisClient.watch(`publishedNote:${data.renote.uri}`);
-					const exists = await redisClient.exists(
-						`publishedNote:${data.renote.uri}`,
-					);
-					if (exists === 0) {
-						// Start the transaction
-						const transaction = redisClient.multi();
-						const key = `publishedNote:${data.renote.uri}`;
-						transaction.set(key, 1, "EX", 30);
-						// Execute the transaction
-						transaction.exec((err, replies) => {
-							// Publish after setting the key in Redis
-							if (!err && data.renote) {
-								publishNotesStream(data.renote);
-							}
-						});
-					} else {
-						// Abort the transaction
-						redisClient.unwatch();
-					}
-				} else if (!boostedByRelay && note.uri) {
+				} else if (note.uri) {
 					// Use Redis transaction for atomicity
 					await redisClient.watch(`publishedNote:${note.uri}`);
 					const exists = await redisClient.exists(`publishedNote:${note.uri}`);
@ -585,10 +555,6 @@ export default async (
 						dm.addFollowersRecipe();
 					}

-					if (["public"].includes(note.visibility)) {
-						deliverToRelays(user, noteActivity);
-					}
-
 					dm.execute();
 				})().then();
 			}
--- a/packages/backend/src/services/note/delete.ts
+++ b/packages/backend/src/services/note/delete.ts
@ -6,21 +6,13 @@ import renderUndo from "@/remote/activitypub/renderer/undo.js";
 import {renderActivity} from "@/remote/activitypub/renderer/index.js";
 import renderTombstone from "@/remote/activitypub/renderer/tombstone.js";
 import config from "@/config/index.js";
-import type { User, ILocalUser, IRemoteUser } from "@/models/entities/user.js";
-import type { Note, IMentionedRemoteUsers } from "@/models/entities/note.js";
-import { Notes, Users, Instances } from "@/models/index.js";
-import {
-	notesChart,
-	perUserNotesChart,
-	instanceChart,
-} from "@/services/chart/index.js";
-import {
-	deliverToFollowers,
-	deliverToUser,
-} from "@/remote/activitypub/deliver-manager.js";
+import type {ILocalUser, IRemoteUser, User} from "@/models/entities/user.js";
+import type {IMentionedRemoteUsers, Note} from "@/models/entities/note.js";
+import {Instances, Notes, Users} from "@/models/index.js";
+import {instanceChart, notesChart, perUserNotesChart,} from "@/services/chart/index.js";
+import {deliverToFollowers, deliverToUser,} from "@/remote/activitypub/deliver-manager.js";
 import {countSameRenotes} from "@/misc/count-same-renotes.js";
 import {registerOrFetchInstanceDoc} from "../register-or-fetch-instance-doc.js";
-import { deliverToRelays } from "../relay.js";
 import meilisearch from "@/db/meilisearch.js";

 /**
@ -182,7 +174,6 @@ async function deliverToConcerned(
 	content: any,
 ) {
 	deliverToFollowers(user, content);
-	deliverToRelays(user, content);
 	const remoteUsers = await getMentionedRemoteUsers(note);
 	for (const remoteUser of remoteUsers) {
 		deliverToUser(user, content, remoteUser);
--- a/packages/backend/src/services/note/polls/update.ts
+++ b/packages/backend/src/services/note/polls/update.ts
@ -1,10 +1,9 @@
 import renderUpdate from "@/remote/activitypub/renderer/update.js";
 import {renderActivity} from "@/remote/activitypub/renderer/index.js";
 import renderNote from "@/remote/activitypub/renderer/note.js";
-import { Users, Notes } from "@/models/index.js";
+import {Notes, Users} from "@/models/index.js";
 import type {Note} from "@/models/entities/note.js";
 import {deliverToFollowers} from "@/remote/activitypub/deliver-manager.js";
-import { deliverToRelays } from "../../relay.js";

 export async function deliverQuestionUpdate(noteId: Note["id"]) {
 	const note = await Notes.findOneBy({ id: noteId });
@ -18,6 +17,5 @@ export async function deliverQuestionUpdate(noteId: Note["id"]) {
 			renderUpdate(await renderNote(note, false), user),
 		);
 		deliverToFollowers(user, content);
-		deliverToRelays(user, content);
 	}
 }
--- a/packages/backend/src/services/relay.ts
+++ b/packages/backend/src/services/relay.ts
@ -1,123 +0,0 @@
-import { IsNull } from "typeorm";
-import { renderFollowRelay } from "@/remote/activitypub/renderer/follow-relay.js";
-import {
-	renderActivity,
-	attachLdSignature,
-} from "@/remote/activitypub/renderer/index.js";
-import renderUndo from "@/remote/activitypub/renderer/undo.js";
-import { deliver } from "@/queue/index.js";
-import type { ILocalUser, User } from "@/models/entities/user.js";
-import { Users, Relays } from "@/models/index.js";
-import { genId } from "@/misc/gen-id.js";
-import { Cache } from "@/misc/cache.js";
-import type { Relay } from "@/models/entities/relay.js";
-import { createSystemUser } from "./create-system-user.js";
-
-const ACTOR_USERNAME = "relay.actor" as const;
-
-const relaysCache = new Cache<Relay[]>(1000 * 60 * 10);
-
-export async function getRelayActor(): Promise<ILocalUser> {
-	const user = await Users.findOneBy({
-		host: IsNull(),
-		username: ACTOR_USERNAME,
-	});
-
-	if (user) return user as ILocalUser;
-
-	const created = await createSystemUser(ACTOR_USERNAME);
-	return created as ILocalUser;
-}
-
-export async function addRelay(inbox: string) {
-	const relay = await Relays.insert({
-		id: genId(),
-		inbox,
-		status: "requesting",
-	}).then((x) => Relays.findOneByOrFail(x.identifiers[0]));
-
-	const relayActor = await getRelayActor();
-	const follow = renderFollowRelay(relay, relayActor);
-	const activity = renderActivity(follow);
-	deliver(relayActor, activity, relay.inbox);
-
-	return relay;
-}
-
-export async function removeRelay(inbox: string) {
-	const relay = await Relays.findOneBy({
-		inbox,
-	});
-
-	if (relay == null) {
-		throw new Error("relay not found");
-	}
-
-	const relayActor = await getRelayActor();
-	const follow = renderFollowRelay(relay, relayActor);
-	const undo = renderUndo(follow, relayActor);
-	const activity = renderActivity(undo);
-	deliver(relayActor, activity, relay.inbox);
-
-	await Relays.delete(relay.id);
-	await updateRelaysCache();
-}
-
-export async function listRelay() {
-	const relays = await Relays.find();
-	return relays;
-}
-
-export async function getCachedRelays(): Promise<Relay[]> {
-	return await relaysCache.fetch(null, () =>
-		Relays.findBy({
-			status: "accepted",
-		}),
-	);
-}
-
-export async function relayAccepted(id: string) {
-	const result = await Relays.update(id, {
-		status: "accepted",
-	});
-
-	await updateRelaysCache();
-
-	return JSON.stringify(result);
-}
-
-async function updateRelaysCache() {
-	const relays = await Relays.findBy({
-		status: "accepted",
-	});
-	relaysCache.set(null, relays);
-}
-
-export async function relayRejected(id: string) {
-	const result = await Relays.update(id, {
-		status: "rejected",
-	});
-
-	return JSON.stringify(result);
-}
-
-export async function deliverToRelays(
-	user: { id: User["id"]; host: null },
-	activity: any,
-) {
-	if (activity == null) return;
-
-	const relays = await getCachedRelays();
-	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 attachLdSignature(copy, user);
-
-	for (const relay of relays) {
-		deliver(user, signed, relay.inbox);
-	}
-}