Merge branch 'develop' into feature/2024.10

33 files changed, 594 insertions, 178 deletions

diff --git a/.config/example.yml b/.config/example.yml
index c9bd20b9c6..10aeb6bccc 100644
--- a/.config/example.yml
+++ b/.config/example.yml
@@ -113,10 +113,10 @@ db:
   port: 5432
 
   # Database name
-  db: misskey
+  db: sharkey
 
   # Auth
-  user: example-misskey-user
+  user: sharkey
   pass: example-misskey-pass
 
   # Whether disable Caching queries
diff --git a/Dockerfile b/Dockerfile
index acef95deab..abee7fb098 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -40,6 +40,8 @@ RUN apk add ffmpeg tini jemalloc \
 	&& corepack enable \
 	&& addgroup -g "${GID}" sharkey \
 	&& adduser -D -u "${UID}" -G sharkey -h /sharkey sharkey \
+	&& mkdir /sharkey/files \
+	&& chown sharkey:sharkey /sharkey/files \
 	&& find / -type d -path /sys -prune -o -type d -path /proc -prune -o -type f -perm /u+s -exec chmod u-s {} \; \
 	&& find / -type d -path /sys -prune -o -type d -path /proc -prune -o -type f -perm /g+s -exec chmod g-s {} \;
 
diff --git a/UPGRADE_NOTES.md b/UPGRADE_NOTES.md
index 8bebd4eb34..c941de6643 100644
--- a/UPGRADE_NOTES.md
+++ b/UPGRADE_NOTES.md
@@ -1,5 +1,38 @@
 # Upgrade Notes
 
+## 2024.10.0
+
+### Hellspawns
+
+Sharkey versions before 2024.10 suffered from a bug in the "Mark instance as NSFW" feature.
+When a user from such an instance boosted a note, the boost would be converted to a hellspawn (pure renote with Content Warning).
+Hellspawns are buggy and do not properly federate, so it may be desirable to correct any that already exist in the database.
+The following script will correct any local or remote hellspawns in the database.
+
+```postgresql
+/* Remove "instance is marked as NSFW" hellspawns */
+UPDATE "note"
+SET "cw" = null
+WHERE
+	"renoteId" IS NOT NULL
+	AND "text" IS NULL
+	AND "cw" = 'Instance is marked as NSFW'
+	AND "replyId" IS NULL
+	AND "hasPoll" = false
+	AND "fileIds" = '{}';
+
+/* Fix legacy / user-created hellspawns */
+UPDATE "note"
+SET "text" = '.'
+WHERE
+	"renoteId" IS NOT NULL
+	AND "text" IS NULL
+	AND "cw" IS NOT NULL
+	AND "replyId" IS NULL
+	AND "hasPoll" = false
+	AND "fileIds" = '{}';
+```
+
 ## 2024.9.0
 
 ### Following Feed
diff --git a/packages/backend/scripts/check_connect.js b/packages/backend/scripts/check_connect.js
index f33a450325..17b198ef62 100644
--- a/packages/backend/scripts/check_connect.js
+++ b/packages/backend/scripts/check_connect.js
@@ -57,4 +57,4 @@ const promises = Array
 		connectToPostgres()
 	]);
 
-await Promise.allSettled(promises);
+await Promise.all(promises);
diff --git a/packages/backend/src/core/DownloadService.ts b/packages/backend/src/core/DownloadService.ts
index 0e992f05de..05b9e64a37 100644
--- a/packages/backend/src/core/DownloadService.ts
+++ b/packages/backend/src/core/DownloadService.ts
@@ -6,7 +6,6 @@
 import * as fs from 'node:fs';
 import * as stream from 'node:stream/promises';
 import { Inject, Injectable } from '@nestjs/common';
-import ipaddr from 'ipaddr.js';
 import chalk from 'chalk';
 import got, * as Got from 'got';
 import { parse } from 'content-disposition';
@@ -70,13 +69,6 @@ export class DownloadService {
 			},
 			enableUnixSockets: false,
 		}).on('response', (res: Got.Response) => {
-			if ((process.env.NODE_ENV === 'production' || process.env.NODE_ENV === 'test') && !this.config.proxy && res.ip) {
-				if (this.isPrivateIp(res.ip)) {
-					this.logger.warn(`Blocked address: ${res.ip}`);
-					req.destroy();
-				}
-			}
-
 			const contentLength = res.headers['content-length'];
 			if (contentLength != null) {
 				const size = Number(contentLength);
@@ -139,18 +131,4 @@ export class DownloadService {
 			cleanup();
 		}
 	}
-
-	@bindThis
-	private isPrivateIp(ip: string): boolean {
-		const parsedIp = ipaddr.parse(ip);
-
-		for (const net of this.config.allowedPrivateNetworks ?? []) {
-			const cidr = ipaddr.parseCIDR(net);
-			if (cidr[0].kind() === parsedIp.kind() && parsedIp.match(ipaddr.parseCIDR(net))) {
-				return false;
-			}
-		}
-
-		return parsedIp.range() !== 'unicast';
-	}
 }
diff --git a/packages/backend/src/core/EmailService.ts b/packages/backend/src/core/EmailService.ts
index a176474b95..da198d0e42 100644
--- a/packages/backend/src/core/EmailService.ts
+++ b/packages/backend/src/core/EmailService.ts
@@ -312,6 +312,7 @@ export class EmailService {
 					Accept: 'application/json',
 					Authorization: truemailAuthKey,
 				},
+				isLocalAddressAllowed: true,
 			});
 
 			const json = (await res.json()) as {
diff --git a/packages/backend/src/core/HttpRequestService.ts b/packages/backend/src/core/HttpRequestService.ts
index bea5dee6ab..083153940a 100644
--- a/packages/backend/src/core/HttpRequestService.ts
+++ b/packages/backend/src/core/HttpRequestService.ts
@@ -6,6 +6,7 @@
 import * as http from 'node:http';
 import * as https from 'node:https';
 import * as net from 'node:net';
+import ipaddr from 'ipaddr.js';
 import CacheableLookup from 'cacheable-lookup';
 import fetch from 'node-fetch';
 import { HttpProxyAgent, HttpsProxyAgent } from 'hpagent';
@@ -25,9 +26,103 @@ export type HttpRequestSendOptions = {
 	validators?: ((res: Response) => void)[];
 };
 
+declare module 'node:http' {
+	interface Agent {
+		createConnection(options: net.NetConnectOpts, callback?: (err: unknown, stream: net.Socket) => void): net.Socket;
+	}
+}
+
+class HttpRequestServiceAgent extends http.Agent {
+	constructor(
+		private config: Config,
+		options?: http.AgentOptions,
+	) {
+		super(options);
+	}
+
+	@bindThis
+	public createConnection(options: net.NetConnectOpts, callback?: (err: unknown, stream: net.Socket) => void): net.Socket {
+		const socket = super.createConnection(options, callback)
+			.on('connect', () => {
+				const address = socket.remoteAddress;
+				if (process.env.NODE_ENV === 'production') {
+					if (address && ipaddr.isValid(address)) {
+						if (this.isPrivateIp(address)) {
+							socket.destroy(new Error(`Blocked address: ${address}`));
+						}
+					}
+				}
+			});
+		return socket;
+	}
+
+	@bindThis
+	private isPrivateIp(ip: string): boolean {
+		const parsedIp = ipaddr.parse(ip);
+
+		for (const net of this.config.allowedPrivateNetworks ?? []) {
+			const cidr = ipaddr.parseCIDR(net);
+			if (cidr[0].kind() === parsedIp.kind() && parsedIp.match(ipaddr.parseCIDR(net))) {
+				return false;
+			}
+		}
+
+		return parsedIp.range() !== 'unicast';
+	}
+}
+
+class HttpsRequestServiceAgent extends https.Agent {
+	constructor(
+		private config: Config,
+		options?: https.AgentOptions,
+	) {
+		super(options);
+	}
+
+	@bindThis
+	public createConnection(options: net.NetConnectOpts, callback?: (err: unknown, stream: net.Socket) => void): net.Socket {
+		const socket = super.createConnection(options, callback)
+			.on('connect', () => {
+				const address = socket.remoteAddress;
+				if (process.env.NODE_ENV === 'production') {
+					if (address && ipaddr.isValid(address)) {
+						if (this.isPrivateIp(address)) {
+							socket.destroy(new Error(`Blocked address: ${address}`));
+						}
+					}
+				}
+			});
+		return socket;
+	}
+
+	@bindThis
+	private isPrivateIp(ip: string): boolean {
+		const parsedIp = ipaddr.parse(ip);
+
+		for (const net of this.config.allowedPrivateNetworks ?? []) {
+			const cidr = ipaddr.parseCIDR(net);
+			if (cidr[0].kind() === parsedIp.kind() && parsedIp.match(ipaddr.parseCIDR(net))) {
+				return false;
+			}
+		}
+
+		return parsedIp.range() !== 'unicast';
+	}
+}
+
 @Injectable()
 export class HttpRequestService {
 	/**
+	 * Get http non-proxy agent (without local address filtering)
+	 */
+	private httpNative: http.Agent;
+
+	/**
+	 * Get https non-proxy agent (without local address filtering)
+	 */
+	private httpsNative: https.Agent;
+
+	/**
 	 * Get http non-proxy agent
 	 */
 	private http: http.Agent;
@@ -57,19 +152,20 @@ export class HttpRequestService {
 			lookup: false,	// nativeのdns.lookupにfallbackしない
 		});
 
-		this.http = new http.Agent({
+		const agentOption = {
 			keepAlive: true,
 			keepAliveMsecs: 30 * 1000,
 			lookup: cache.lookup as unknown as net.LookupFunction,
 			localAddress: config.outgoingAddress,
-		});
+		};
 
-		this.https = new https.Agent({
-			keepAlive: true,
-			keepAliveMsecs: 30 * 1000,
-			lookup: cache.lookup as unknown as net.LookupFunction,
-			localAddress: config.outgoingAddress,
-		});
+		this.httpNative = new http.Agent(agentOption);
+
+		this.httpsNative = new https.Agent(agentOption);
+
+		this.http = new HttpRequestServiceAgent(config, agentOption);
+
+		this.https = new HttpsRequestServiceAgent(config, agentOption);
 
 		const maxSockets = Math.max(256, config.deliverJobConcurrency ?? 128);
 
@@ -104,16 +200,22 @@ export class HttpRequestService {
 	 * @param bypassProxy Allways bypass proxy
 	 */
 	@bindThis
-	public getAgentByUrl(url: URL, bypassProxy = false): http.Agent | https.Agent {
+	public getAgentByUrl(url: URL, bypassProxy = false, isLocalAddressAllowed = false): http.Agent | https.Agent {
 		if (bypassProxy || (this.config.proxyBypassHosts ?? []).includes(url.hostname)) {
+			if (isLocalAddressAllowed) {
+				return url.protocol === 'http:' ? this.httpNative : this.httpsNative;
+			}
 			return url.protocol === 'http:' ? this.http : this.https;
 		} else {
+			if (isLocalAddressAllowed && (!this.config.proxy)) {
+				return url.protocol === 'http:' ? this.httpNative : this.httpsNative;
+			}
 			return url.protocol === 'http:' ? this.httpAgent : this.httpsAgent;
 		}
 	}
 
 	@bindThis
-	public async getActivityJson(url: string): Promise<IObject> {
+	public async getActivityJson(url: string, isLocalAddressAllowed = false): Promise<IObject> {
 		const res = await this.send(url, {
 			method: 'GET',
 			headers: {
@@ -121,6 +223,7 @@ export class HttpRequestService {
 			},
 			timeout: 5000,
 			size: 1024 * 256,
+			isLocalAddressAllowed: isLocalAddressAllowed,
 		}, {
 			throwErrorWhenResponseNotOk: true,
 			validators: [validateContentTypeSetAsActivityPub],
@@ -129,13 +232,13 @@ export class HttpRequestService {
 		const finalUrl = res.url; // redirects may have been involved
 		const activity = await res.json() as IObject;
 
-		assertActivityMatchesUrls(activity, [url, finalUrl]);
+		assertActivityMatchesUrls(activity, [finalUrl]);
 
 		return activity;
 	}
 
 	@bindThis
-	public async getJson<T = unknown>(url: string, accept = 'application/json, */*', headers?: Record<string, string>): Promise<T> {
+	public async getJson<T = unknown>(url: string, accept = 'application/json, */*', headers?: Record<string, string>, isLocalAddressAllowed = false): Promise<T> {
 		const res = await this.send(url, {
 			method: 'GET',
 			headers: Object.assign({
@@ -143,19 +246,21 @@ export class HttpRequestService {
 			}, headers ?? {}),
 			timeout: 5000,
 			size: 1024 * 256,
+			isLocalAddressAllowed: isLocalAddressAllowed,
 		});
 
 		return await res.json() as T;
 	}
 
 	@bindThis
-	public async getHtml(url: string, accept = 'text/html, */*', headers?: Record<string, string>): Promise<string> {
+	public async getHtml(url: string, accept = 'text/html, */*', headers?: Record<string, string>, isLocalAddressAllowed = false): Promise<string> {
 		const res = await this.send(url, {
 			method: 'GET',
 			headers: Object.assign({
 				Accept: accept,
 			}, headers ?? {}),
 			timeout: 5000,
+			isLocalAddressAllowed: isLocalAddressAllowed,
 		});
 
 		return await res.text();
@@ -170,6 +275,7 @@ export class HttpRequestService {
 			headers?: Record<string, string>,
 			timeout?: number,
 			size?: number,
+			isLocalAddressAllowed?: boolean,
 		} = {},
 		extra: HttpRequestSendOptions = {
 			throwErrorWhenResponseNotOk: true,
@@ -183,6 +289,8 @@ export class HttpRequestService {
 			controller.abort();
 		}, timeout);
 
+		const isLocalAddressAllowed = args.isLocalAddressAllowed ?? false;
+
 		const res = await fetch(url, {
 			method: args.method ?? 'GET',
 			headers: {
@@ -191,7 +299,7 @@ export class HttpRequestService {
 			},
 			body: args.body,
 			size: args.size ?? 10 * 1024 * 1024,
-			agent: (url) => this.getAgentByUrl(url),
+			agent: (url) => this.getAgentByUrl(url, false, isLocalAddressAllowed),
 			signal: controller.signal,
 		});
 
diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index e5808eccdc..13bafb7883 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -146,6 +146,8 @@ type Option = {
 	app?: MiApp | null;
 };
 
+export type PureRenoteOption = Option & { renote: MiNote } & ({ text?: null } | { cw?: null } | { reply?: null } | { poll?: null } | { files?: null | [] });
+
 @Injectable()
 export class NoteCreateService implements OnApplicationShutdown {
 	#shutdownController = new AbortController();
@@ -412,7 +414,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 
 		if (user.host && !data.cw) {
 			await this.federatedInstanceService.fetchOrRegister(user.host).then(async i => {
-				if (i.isNSFW) {
+				if (i.isNSFW && !this.isPureRenote(data)) {
 					data.cw = 'Instance is marked as NSFW';
 				}
 			});
@@ -822,6 +824,11 @@ export class NoteCreateService implements OnApplicationShutdown {
 	}
 
 	@bindThis
+	public isPureRenote(note: Option): note is PureRenoteOption {
+		return this.isRenote(note) && !this.isQuote(note);
+	}
+
+	@bindThis
 	private isRenote(note: Option): note is Option & { renote: MiNote } {
 		return note.renote != null;
 	}
diff --git a/packages/backend/src/core/NoteEditService.ts b/packages/backend/src/core/NoteEditService.ts
index 91b310a065..1bb3a723b1 100644
--- a/packages/backend/src/core/NoteEditService.ts
+++ b/packages/backend/src/core/NoteEditService.ts
@@ -442,7 +442,7 @@ export class NoteEditService implements OnApplicationShutdown {
 
 		if (user.host && !data.cw) {
 			await this.federatedInstanceService.fetchOrRegister(user.host).then(async i => {
-				if (i.isNSFW) {
+				if (i.isNSFW && !this.noteCreateService.isPureRenote(data)) {
 					data.cw = 'Instance is marked as NSFW';
 				}
 			});
diff --git a/packages/backend/src/core/RemoteUserResolveService.ts b/packages/backend/src/core/RemoteUserResolveService.ts
index f5a55eb8bc..098b5e1706 100644
--- a/packages/backend/src/core/RemoteUserResolveService.ts
+++ b/packages/backend/src/core/RemoteUserResolveService.ts
@@ -56,7 +56,7 @@ export class RemoteUserResolveService {
 
 		host = this.utilityService.toPuny(host);
 
-		if (this.config.host === host) {
+		if (host === this.utilityService.toPuny(this.config.host)) {
 			this.logger.info(`return local user: ${usernameLower}`);
 			return await this.usersRepository.findOneBy({ usernameLower, host: IsNull() }).then(u => {
 				if (u == null) {
diff --git a/packages/backend/src/core/UtilityService.ts b/packages/backend/src/core/UtilityService.ts
index 009dd4665f..4c6d539e16 100644
--- a/packages/backend/src/core/UtilityService.ts
+++ b/packages/backend/src/core/UtilityService.ts
@@ -35,6 +35,11 @@ export class UtilityService {
 	}
 
 	@bindThis
+	public isUriLocal(uri: string): boolean {
+		return this.punyHost(uri) === this.toPuny(this.config.host);
+	}
+
+	@bindThis
 	public isBlockedHost(blockedHosts: string[], host: string | null): boolean {
 		if (host == null) return false;
 		return blockedHosts.some(x => `.${host.toLowerCase()}`.endsWith(`.${x}`));
diff --git a/packages/backend/src/core/activitypub/ApDbResolverService.ts b/packages/backend/src/core/activitypub/ApDbResolverService.ts
index 8c97cc8ce8..f6b50ec704 100644
--- a/packages/backend/src/core/activitypub/ApDbResolverService.ts
+++ b/packages/backend/src/core/activitypub/ApDbResolverService.ts
@@ -10,6 +10,7 @@ import type { Config } from '@/config.js';
 import { MemoryKVCache } from '@/misc/cache.js';
 import type { MiUserPublickey } from '@/models/UserPublickey.js';
 import { CacheService } from '@/core/CacheService.js';
+import { UtilityService } from '@/core/UtilityService.js';
 import type { MiNote } from '@/models/Note.js';
 import { bindThis } from '@/decorators.js';
 import type { MiLocalUser, MiRemoteUser } from '@/models/User.js';
@@ -55,6 +56,7 @@ export class ApDbResolverService implements OnApplicationShutdown {
 		private cacheService: CacheService,
 		private apPersonService: ApPersonService,
 		private apLoggerService: ApLoggerService,
+		private utilityService: UtilityService,
 	) {
 		this.publicKeyCache = new MemoryKVCache<MiUserPublickey | null>(1000 * 60 * 60 * 12); // 12h
 		this.publicKeyByUserIdCache = new MemoryKVCache<MiUserPublickey | null>(1000 * 60 * 60 * 12); // 12h
@@ -64,8 +66,11 @@ export class ApDbResolverService implements OnApplicationShutdown {
 	public parseUri(value: string | IObject | [string | IObject]): UriParseResult {
 		const separator = '/';
 
-		const uri = new URL(getApId(value));
-		if (uri.origin !== this.config.url) return { local: false, uri: uri.href };
+		const apId = getApId(value);
+		const uri = new URL(apId);
+		if (this.utilityService.toPuny(uri.host) !== this.utilityService.toPuny(this.config.host)) {
+			return { local: false, uri: apId };
+		}
 
 		const [, type, id, ...rest] = uri.pathname.split(separator);
 		return {
diff --git a/packages/backend/src/core/activitypub/ApInboxService.ts b/packages/backend/src/core/activitypub/ApInboxService.ts
index 1a2359ac3a..64b64013af 100644
--- a/packages/backend/src/core/activitypub/ApInboxService.ts
+++ b/packages/backend/src/core/activitypub/ApInboxService.ts
@@ -30,6 +30,8 @@ import type { MiRemoteUser } from '@/models/User.js';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
 import { AbuseReportService } from '@/core/AbuseReportService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
+import { fromTuple } from '@/misc/from-tuple.js';
+import { IdentifiableError } from '@/misc/identifiable-error.js';
 import { getApHrefNullable, getApId, getApIds, getApType, isAccept, isActor, isAdd, isAnnounce, isBlock, isCollection, isCollectionOrOrderedCollection, isCreate, isDelete, isFlag, isFollow, isLike, isMove, isPost, isReject, isRemove, isTombstone, isUndo, isUpdate, validActor, validPost } from './type.js';
 import { ApNoteService } from './models/ApNoteService.js';
 import { ApLoggerService } from './ApLoggerService.js';
@@ -40,7 +42,6 @@ import { ApPersonService } from './models/ApPersonService.js';
 import { ApQuestionService } from './models/ApQuestionService.js';
 import type { Resolver } from './ApResolverService.js';
 import type { IAccept, IAdd, IAnnounce, IBlock, ICreate, IDelete, IFlag, IFollow, ILike, IObject, IReject, IRemove, IUndo, IUpdate, IMove, IPost } from './type.js';
-import { fromTuple } from '@/misc/from-tuple.js';
 
 @Injectable()
 export class ApInboxService {
@@ -93,15 +94,26 @@ export class ApInboxService {
 	}
 
 	@bindThis
-	public async performActivity(actor: MiRemoteUser, activity: IObject): Promise<string | void> {
+	public async performActivity(actor: MiRemoteUser, activity: IObject, resolver?: Resolver): Promise<string | void> {
 		let result = undefined as string | void;
 		if (isCollectionOrOrderedCollection(activity)) {
 			const results = [] as [string, string | void][];
-			const resolver = this.apResolverService.createResolver();
-			for (const item of toArray(isCollection(activity) ? activity.items : activity.orderedItems)) {
+			// eslint-disable-next-line no-param-reassign
+			resolver ??= this.apResolverService.createResolver();
+
+			const items = toArray(isCollection(activity) ? activity.items : activity.orderedItems);
+			if (items.length >= resolver.getRecursionLimit()) {
+				throw new Error(`skipping activity: collection would surpass recursion limit: ${this.utilityService.extractDbHost(actor.uri)}`);
+			}
+
+			for (const item of items) {
 				const act = await resolver.resolve(item);
+				if (act.id == null || this.utilityService.extractDbHost(act.id) !== this.utilityService.extractDbHost(actor.uri)) {
+					this.logger.debug('skipping activity: activity id is null or mismatching');
+					continue;
+				}
 				try {
-					results.push([getApId(item), await this.performOneActivity(actor, act)]);
+					results.push([getApId(item), await this.performOneActivity(actor, act, resolver)]);
 				} catch (err) {
 					if (err instanceof Error || typeof err === 'string') {
 						this.logger.error(err);
@@ -116,7 +128,7 @@ export class ApInboxService {
 				result = results.map(([id, reason]) => `${id}: ${reason}`).join('\n');
 			}
 		} else {
-			result = await this.performOneActivity(actor, activity);
+			result = await this.performOneActivity(actor, activity, resolver);
 		}
 
 		// ついでにリモートユーザーの情報が古かったら更新しておく
@@ -131,37 +143,37 @@ export class ApInboxService {
 	}
 
 	@bindThis
-	public async performOneActivity(actor: MiRemoteUser, activity: IObject): Promise<string | void> {
+	public async performOneActivity(actor: MiRemoteUser, activity: IObject, resolver?: Resolver): Promise<string | void> {
 		if (actor.isSuspended) return;
 
 		if (isCreate(activity)) {
-			return await this.create(actor, activity);
+			return await this.create(actor, activity, resolver);
 		} else if (isDelete(activity)) {
 			return await this.delete(actor, activity);
 		} else if (isUpdate(activity)) {
-			return await this.update(actor, activity);
+			return await this.update(actor, activity, resolver);
 		} else if (isFollow(activity)) {
 			return await this.follow(actor, activity);
 		} else if (isAccept(activity)) {
-			return await this.accept(actor, activity);
+			return await this.accept(actor, activity, resolver);
 		} else if (isReject(activity)) {
-			return await this.reject(actor, activity);
+			return await this.reject(actor, activity, resolver);
 		} else if (isAdd(activity)) {
-			return await this.add(actor, activity);
+			return await this.add(actor, activity, resolver);
 		} else if (isRemove(activity)) {
-			return await this.remove(actor, activity);
+			return await this.remove(actor, activity, resolver);
 		} else if (isAnnounce(activity)) {
-			return await this.announce(actor, activity);
+			return await this.announce(actor, activity, resolver);
 		} else if (isLike(activity)) {
 			return await this.like(actor, activity);
 		} else if (isUndo(activity)) {
-			return await this.undo(actor, activity);
+			return await this.undo(actor, activity, resolver);
 		} else if (isBlock(activity)) {
 			return await this.block(actor, activity);
 		} else if (isFlag(activity)) {
 			return await this.flag(actor, activity);
 		} else if (isMove(activity)) {
-			return await this.move(actor, activity);
+			return await this.move(actor, activity, resolver);
 		} else {
 			return `unrecognized activity type: ${activity.type}`;
 		}
@@ -193,22 +205,26 @@ export class ApInboxService {
 
 		await this.apNoteService.extractEmojis(activity.tag ?? [], actor.host).catch(() => null);
 
-		return await this.reactionService.create(actor, note, activity._misskey_reaction ?? activity.content ?? activity.name).catch(err => {
-			if (err.id === '51c42bb4-931a-456b-bff7-e5a8a70dd298') {
+		try {
+			await this.reactionService.create(actor, note, activity._misskey_reaction ?? activity.content ?? activity.name);
+			return 'ok';
+		} catch (err) {
+			if (err instanceof IdentifiableError && err.id === '51c42bb4-931a-456b-bff7-e5a8a70dd298') {
 				return 'skip: already reacted';
 			} else {
 				throw err;
 			}
-		}).then(() => 'ok');
+		}
 	}
 
 	@bindThis
-	private async accept(actor: MiRemoteUser, activity: IAccept): Promise<string> {
+	private async accept(actor: MiRemoteUser, activity: IAccept, resolver?: Resolver): Promise<string> {
 		const uri = activity.id ?? activity;
 
 		this.logger.info(`Accept: ${uri}`);
 
-		const resolver = this.apResolverService.createResolver();
+		// eslint-disable-next-line no-param-reassign
+		resolver ??= this.apResolverService.createResolver();
 
 		const object = await resolver.resolve(activity.object).catch(err => {
 			this.logger.error(`Resolution failed: ${err}`);
@@ -245,7 +261,7 @@ export class ApInboxService {
 	}
 
 	@bindThis
-	private async add(actor: MiRemoteUser, activity: IAdd): Promise<string | void> {
+	private async add(actor: MiRemoteUser, activity: IAdd, resolver?: Resolver): Promise<string | void> {
 		if (actor.uri !== activity.actor) {
 			return 'invalid actor';
 		}
@@ -256,7 +272,7 @@ export class ApInboxService {
 
 		if (activity.target === actor.featured) {
 			const object = fromTuple(activity.object);
-			const note = await this.apNoteService.resolveNote(object);
+			const note = await this.apNoteService.resolveNote(object, { resolver });
 			if (note == null) return 'note not found';
 			await this.notePiningService.addPinned(actor, note.id);
 			return;
@@ -266,12 +282,13 @@ export class ApInboxService {
 	}
 
 	@bindThis
-	private async announce(actor: MiRemoteUser, activity: IAnnounce): Promise<string | void> {
+	private async announce(actor: MiRemoteUser, activity: IAnnounce, resolver?: Resolver): Promise<string | void> {
 		const uri = getApId(activity);
 
 		this.logger.info(`Announce: ${uri}`);
 
-		const resolver = this.apResolverService.createResolver();
+		// eslint-disable-next-line no-param-reassign
+		resolver ??= this.apResolverService.createResolver();
 
 		const activityObject = fromTuple(activity.object);
 		if (!activityObject) return 'skip: activity has no object property';
@@ -280,7 +297,7 @@ export class ApInboxService {
 
 		const target = await resolver.resolve(activityObject).catch(e => {
 			this.logger.error(`Resolution failed: ${e}`);
-			return e;
+			throw e;
 		});
 
 		if (isPost(target)) return await this.announceNote(actor, activity, target);
@@ -289,7 +306,7 @@ export class ApInboxService {
 	}
 
 	@bindThis
-	private async announceNote(actor: MiRemoteUser, activity: IAnnounce, target: IPost): Promise<string | void> {
+	private async announceNote(actor: MiRemoteUser, activity: IAnnounce, target: IPost, resolver?: Resolver): Promise<string | void> {
 		const uri = getApId(activity);
 
 		if (actor.isSuspended) {
@@ -311,7 +328,7 @@ export class ApInboxService {
 			// Announce対象をresolve
 			let renote;
 			try {
-				renote = await this.apNoteService.resolveNote(target);
+				renote = await this.apNoteService.resolveNote(target, { resolver });
 				if (renote == null) return 'announce target is null';
 			} catch (err) {
 				// 対象が4xxならスキップ
@@ -330,7 +347,7 @@ export class ApInboxService {
 
 			this.logger.info(`Creating the (Re)Note: ${uri}`);
 
-			const activityAudience = await this.apAudienceService.parseAudience(actor, activity.to, activity.cc);
+			const activityAudience = await this.apAudienceService.parseAudience(actor, activity.to, activity.cc, resolver);
 			const createdAt = activity.published ? new Date(activity.published) : null;
 
 			if (createdAt && createdAt < this.idService.parse(renote.id).date) {
@@ -368,7 +385,7 @@ export class ApInboxService {
 	}
 
 	@bindThis
-	private async create(actor: MiRemoteUser, activity: ICreate): Promise<string | void> {
+	private async create(actor: MiRemoteUser, activity: ICreate, resolver?: Resolver): Promise<string | void> {
 		const uri = getApId(activity);
 
 		this.logger.info(`Create: ${uri}`);
@@ -394,7 +411,8 @@ export class ApInboxService {
 			activityObject.attributedTo = activity.actor;
 		}
 
-		const resolver = this.apResolverService.createResolver();
+		// eslint-disable-next-line no-param-reassign
+		resolver ??= this.apResolverService.createResolver();
 
 		const object = await resolver.resolve(activityObject).catch(e => {
 			this.logger.error(`Resolution failed: ${e}`);
@@ -421,6 +439,8 @@ export class ApInboxService {
 				if (this.utilityService.extractDbHost(actor.uri) !== this.utilityService.extractDbHost(note.id)) {
 					return 'skip: host in actor.uri !== note.id';
 				}
+			} else {
+				return 'skip: note.id is not a string';
 			}
 		}
 
@@ -430,7 +450,7 @@ export class ApInboxService {
 			const exist = await this.apNoteService.fetchNote(note);
 			if (exist) return 'skip: note exists';
 
-			await this.apNoteService.createNote(note, resolver, silent);
+			await this.apNoteService.createNote(note, actor, resolver, silent);
 			return 'ok';
 		} catch (err) {
 			if (err instanceof StatusError && !err.isRetryable) {
@@ -568,12 +588,13 @@ export class ApInboxService {
 	}
 
 	@bindThis
-	private async reject(actor: MiRemoteUser, activity: IReject): Promise<string> {
+	private async reject(actor: MiRemoteUser, activity: IReject, resolver?: Resolver): Promise<string> {
 		const uri = activity.id ?? activity;
 
 		this.logger.info(`Reject: ${uri}`);
 
-		const resolver = this.apResolverService.createResolver();
+		// eslint-disable-next-line no-param-reassign
+		resolver ??= this.apResolverService.createResolver();
 
 		const object = await resolver.resolve(activity.object).catch(e => {
 			this.logger.error(`Resolution failed: ${e}`);
@@ -610,7 +631,7 @@ export class ApInboxService {
 	}
 
 	@bindThis
-	private async remove(actor: MiRemoteUser, activity: IRemove): Promise<string | void> {
+	private async remove(actor: MiRemoteUser, activity: IRemove, resolver?: Resolver): Promise<string | void> {
 		if (actor.uri !== activity.actor) {
 			return 'invalid actor';
 		}
@@ -621,7 +642,7 @@ export class ApInboxService {
 
 		if (activity.target === actor.featured) {
 			const activityObject = fromTuple(activity.object);
-			const note = await this.apNoteService.resolveNote(activityObject);
+			const note = await this.apNoteService.resolveNote(activityObject, { resolver });
 			if (note == null) return 'note not found';
 			await this.notePiningService.removePinned(actor, note.id);
 			return;
@@ -631,7 +652,7 @@ export class ApInboxService {
 	}
 
 	@bindThis
-	private async undo(actor: MiRemoteUser, activity: IUndo): Promise<string> {
+	private async undo(actor: MiRemoteUser, activity: IUndo, resolver?: Resolver): Promise<string> {
 		if (actor.uri !== activity.actor) {
 			return 'invalid actor';
 		}
@@ -640,11 +661,12 @@ export class ApInboxService {
 
 		this.logger.info(`Undo: ${uri}`);
 
-		const resolver = this.apResolverService.createResolver();
+		// eslint-disable-next-line no-param-reassign
+		resolver ??= this.apResolverService.createResolver();
 
 		const object = await resolver.resolve(activity.object).catch(e => {
 			this.logger.error(`Resolution failed: ${e}`);
-			return e;
+			throw e;
 		});
 
 		// don't queue because the sender may attempt again when timeout
@@ -764,14 +786,15 @@ export class ApInboxService {
 	}
 
 	@bindThis
-	private async update(actor: MiRemoteUser, activity: IUpdate): Promise<string> {
+	private async update(actor: MiRemoteUser, activity: IUpdate, resolver?: Resolver): Promise<string> {
 		if (actor.uri !== activity.actor) {
 			return 'skip: invalid actor';
 		}
 
 		this.logger.debug('Update');
 
-		const resolver = this.apResolverService.createResolver();
+		// eslint-disable-next-line no-param-reassign
+		resolver ??= this.apResolverService.createResolver();
 
 		const object = await resolver.resolve(activity.object).catch(e => {
 			this.logger.error(`Resolution failed: ${e}`);
@@ -782,10 +805,10 @@ export class ApInboxService {
 			await this.apPersonService.updatePerson(actor.uri, resolver, object);
 			return 'ok: Person updated';
 		} else if (getApType(object) === 'Question') {
-			await this.apQuestionService.updateQuestion(object, resolver).catch(err => console.error(err));
+			await this.apQuestionService.updateQuestion(object, actor, resolver).catch(err => console.error(err));
 			return 'ok: Question updated';
-		} else if (getApType(object) === 'Note') {
-			await this.apNoteService.updateNote(object, resolver).catch(err => console.error(err));
+		} else if (isPost(object)) {
+			await this.apNoteService.updateNote(object, actor, resolver).catch(err => console.error(err));
 			return 'ok: Note updated';
 		} else {
 			return `skip: Unknown type: ${getApType(object)}`;
@@ -793,11 +816,11 @@ export class ApInboxService {
 	}
 
 	@bindThis
-	private async move(actor: MiRemoteUser, activity: IMove): Promise<string> {
+	private async move(actor: MiRemoteUser, activity: IMove, resolver?: Resolver): Promise<string> {
 		// fetch the new and old accounts
 		const targetUri = getApHrefNullable(activity.target);
 		if (!targetUri) return 'skip: invalid activity target';
 
-		return await this.apPersonService.updatePerson(actor.uri) ?? 'skip: nothing to do';
+		return await this.apPersonService.updatePerson(actor.uri, resolver) ?? 'skip: nothing to do';
 	}
 }
diff --git a/packages/backend/src/core/activitypub/ApRequestService.ts b/packages/backend/src/core/activitypub/ApRequestService.ts
index 38c78cf900..eeff73385b 100644
--- a/packages/backend/src/core/activitypub/ApRequestService.ts
+++ b/packages/backend/src/core/activitypub/ApRequestService.ts
@@ -18,6 +18,7 @@ import type Logger from '@/logger.js';
 import type { IObject } from './type.js';
 import { validateContentTypeSetAsActivityPub } from '@/core/activitypub/misc/validator.js';
 import { assertActivityMatchesUrls } from '@/core/activitypub/misc/check-against-url.js';
+import { UtilityService } from "@/core/UtilityService.js";
 
 type Request = {
 	url: string;
@@ -147,6 +148,7 @@ export class ApRequestService {
 		private userKeypairService: UserKeypairService,
 		private httpRequestService: HttpRequestService,
 		private loggerService: LoggerService,
+		private utilityService: UtilityService,
 	) {
 		// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
 		this.logger = this.loggerService?.getLogger('ap-request'); // なぜか TypeError: Cannot read properties of undefined (reading 'getLogger') と言われる
@@ -241,7 +243,9 @@ export class ApRequestService {
 				if (alternate) {
 					const href = alternate.getAttribute('href');
 					if (href) {
-						return await this.signedGet(href, user, false);
+						if (this.utilityService.punyHost(url) === this.utilityService.punyHost(href)) {
+							return await this.signedGet(href, user, false);
+						}
 					}
 				}
 			} catch (e) {
@@ -257,7 +261,7 @@ export class ApRequestService {
 		const finalUrl = res.url; // redirects may have been involved
 		const activity = await res.json() as IObject;
 
-		assertActivityMatchesUrls(activity, [url, finalUrl]);
+		assertActivityMatchesUrls(activity, [finalUrl]);
 
 		return activity;
 	}
diff --git a/packages/backend/src/core/activitypub/ApResolverService.ts b/packages/backend/src/core/activitypub/ApResolverService.ts
index 5d5c61ce2c..25ccbdac60 100644
--- a/packages/backend/src/core/activitypub/ApResolverService.ts
+++ b/packages/backend/src/core/activitypub/ApResolverService.ts
@@ -42,7 +42,7 @@ export class Resolver {
 		private apRendererService: ApRendererService,
 		private apDbResolverService: ApDbResolverService,
 		private loggerService: LoggerService,
-		private recursionLimit = 100,
+		private recursionLimit = 256,
 	) {
 		this.history = new Set();
 		this.logger = this.loggerService.getLogger('ap-resolve');
@@ -54,6 +54,11 @@ export class Resolver {
 	}
 
 	@bindThis
+	public getRecursionLimit(): number {
+		return this.recursionLimit;
+	}
+
+	@bindThis
 	public async resolveCollection(value: string | IObject): Promise<ICollection | IOrderedCollection> {
 		const collection = typeof value === 'string'
 			? await this.resolve(value)
@@ -121,7 +126,11 @@ export class Resolver {
 		// `object.id` or `object.url` matches the URL used to fetch the
 		// object after redirects; here we double-check that no redirects
 		// bounced between hosts
-		if (object.id && (this.utilityService.punyHost(object.id) !== this.utilityService.punyHost(value))) {
+		if (object.id == null) {
+			throw new Error('invalid AP object: missing id');
+		}
+
+		if (this.utilityService.punyHost(object.id) !== this.utilityService.punyHost(value)) {
 			throw new Error(`invalid AP object ${value}: id ${object.id} has different host`);
 		}
 
diff --git a/packages/backend/src/core/activitypub/models/ApNoteService.ts b/packages/backend/src/core/activitypub/models/ApNoteService.ts
index f404a77fbb..a0ddc2075b 100644
--- a/packages/backend/src/core/activitypub/models/ApNoteService.ts
+++ b/packages/backend/src/core/activitypub/models/ApNoteService.ts
@@ -6,7 +6,7 @@
 import { forwardRef, Inject, Injectable } from '@nestjs/common';
 import { In } from 'typeorm';
 import { DI } from '@/di-symbols.js';
-import type { PollsRepository, EmojisRepository, NotesRepository, MiMeta } from '@/models/_.js';
+import type { UsersRepository, PollsRepository, EmojisRepository, NotesRepository, MiMeta } from '@/models/_.js';
 import type { Config } from '@/config.js';
 import type { MiRemoteUser } from '@/models/User.js';
 import type { MiNote } from '@/models/Note.js';
@@ -49,6 +49,9 @@ export class ApNoteService {
 		@Inject(DI.meta)
 		private meta: MiMeta,
 
+		@Inject(DI.usersRepository)
+		private usersRepository: UsersRepository,
+
 		@Inject(DI.pollsRepository)
 		private pollsRepository: PollsRepository,
 
@@ -82,7 +85,13 @@ export class ApNoteService {
 	}
 
 	@bindThis
-	public validateNote(object: IObject, uri: string): Error | null {
+	public validateNote(
+		object: IObject,
+		uri: string,
+		actor?: MiRemoteUser,
+		user?: MiRemoteUser,
+		note?: MiNote,
+	): Error | null {
 		const expectHost = this.utilityService.extractDbHost(uri);
 		const apType = getApType(object);
 
@@ -99,10 +108,27 @@ export class ApNoteService {
 			return new IdentifiableError('d450b8a9-48e4-4dab-ae36-f4db763fda7c', `invalid Note: attributedTo has different host. expected: ${expectHost}, actual: ${actualHost}`);
 		}
 
+		if (actor) {
+			const attribution = (object.attributedTo) ? getOneApId(object.attributedTo) : actor.uri;
+			if (attribution !== actor.uri) {
+				return new IdentifiableError('d450b8a9-48e4-4dab-ae36-f4db763fda7c', `invalid Note: attribution does not match the actor that send it. attribution: ${attribution}, actor: ${actor.uri}`);
+			}
+			if (user && attribution !== user.uri) {
+				return new IdentifiableError('d450b8a9-48e4-4dab-ae36-f4db763fda7c', `invalid Note: updated attribution does not match original attribution. updated attribution: ${user.uri}, original attribution: ${attribution}`);
+			}
+		}
+
 		if (object.published && !this.idService.isSafeT(new Date(object.published).valueOf())) {
 			return new IdentifiableError('d450b8a9-48e4-4dab-ae36-f4db763fda7c', 'invalid Note: published timestamp is malformed');
 		}
 
+		if (note) {
+			const url = (object.url) ? getOneApId(object.url) : note.url;
+			if (url && url !== note.url) {
+				return new IdentifiableError('d450b8a9-48e4-4dab-ae36-f4db763fda7c', `invalid Note: updated url does not match original url. updated url: ${url}, original url: ${note.url}`);
+			}
+		}
+
 		return null;
 	}
 
@@ -120,14 +146,14 @@ export class ApNoteService {
 	 * Noteを作成します。
 	 */
 	@bindThis
-	public async createNote(value: string | IObject, resolver?: Resolver, silent = false): Promise<MiNote | null> {
+	public async createNote(value: string | IObject, actor?: MiRemoteUser, resolver?: Resolver, silent = false): Promise<MiNote | null> {
 		// eslint-disable-next-line no-param-reassign
 		if (resolver == null) resolver = this.apResolverService.createResolver();
 
 		const object = await resolver.resolve(value);
 
 		const entryUri = getApId(value);
-		const err = this.validateNote(object, entryUri);
+		const err = this.validateNote(object, entryUri, actor);
 		if (err) {
 			this.logger.error(err.message, {
 				resolver: { history: resolver.getHistory() },
@@ -141,14 +167,24 @@ export class ApNoteService {
 
 		this.logger.debug(`Note fetched: ${JSON.stringify(note, null, 2)}`);
 
-		if (note.id && !checkHttps(note.id)) {
+		if (note.id == null) {
+			throw new Error('Refusing to create note without id');
+		}
+
+		if (!checkHttps(note.id)) {
 			throw new Error('unexpected schema of note.id: ' + note.id);
 		}
 
 		const url = getOneApHrefNullable(note.url);
 
-		if (url && !checkHttps(url)) {
-			throw new Error('unexpected schema of note url: ' + url);
+		if (url != null) {
+			if (!checkHttps(url)) {
+				throw new Error('unexpected schema of note url: ' + url);
+			}
+
+			if (this.utilityService.punyHost(url) !== this.utilityService.punyHost(note.id)) {
+				throw new Error(`note url <> uri host mismatch: ${url} <> ${note.id}`);
+			}
 		}
 
 		this.logger.info(`Creating the Note: ${note.id}`);
@@ -161,8 +197,9 @@ export class ApNoteService {
 		const uri = getOneApId(note.attributedTo);
 
 		// ローカルで投稿者を検索し、もし凍結されていたらスキップ
-		const cachedActor = await this.apPersonService.fetchPerson(uri) as MiRemoteUser;
-		if (cachedActor && cachedActor.isSuspended) {
+		// eslint-disable-next-line no-param-reassign
+		actor ??= await this.apPersonService.fetchPerson(uri) as MiRemoteUser | undefined;
+		if (actor && actor.isSuspended) {
 			throw new IdentifiableError('85ab9bd7-3a41-4530-959d-f07073900109', 'actor has been suspended');
 		}
 
@@ -194,7 +231,8 @@ export class ApNoteService {
 		}
 		//#endregion
 
-		const actor = cachedActor ?? await this.apPersonService.resolvePerson(uri, resolver) as MiRemoteUser;
+		// eslint-disable-next-line no-param-reassign
+		actor ??= await this.apPersonService.resolvePerson(uri, resolver) as MiRemoteUser;
 
 		// 解決した投稿者が凍結されていたらスキップ
 		if (actor.isSuspended) {
@@ -335,7 +373,7 @@ export class ApNoteService {
 	 * Noteを作成します。
 	 */
 	@bindThis
-	public async updateNote(value: string | IObject, resolver?: Resolver, silent = false): Promise<MiNote | null> {
+	public async updateNote(value: string | IObject, actor?: MiRemoteUser, resolver?: Resolver, silent = false): Promise<MiNote | null> {
 		const noteUri = typeof value === 'string' ? value : value.id;
 		if (noteUri == null) throw new Error('uri is null');
 
@@ -346,6 +384,9 @@ export class ApNoteService {
 		const UpdatedNote = await this.notesRepository.findOneBy({ uri: noteUri });
 		if (UpdatedNote == null) throw new Error('Note is not registered');
 
+		const user = await this.usersRepository.findOneBy({ id: UpdatedNote.userId }) as MiRemoteUser | null;
+		if (user == null) throw new Error('Note is not registered');
+
 		// eslint-disable-next-line no-param-reassign
 		if (resolver == null) resolver = this.apResolverService.createResolver();
 
@@ -362,11 +403,19 @@ export class ApNoteService {
 			throw err;
 		}
 
+		// `validateNote` checks that the actor and user are one and the same
+		// eslint-disable-next-line no-param-reassign
+		actor ??= user;
+
 		const note = object as IPost;
 
 		this.logger.debug(`Note fetched: ${JSON.stringify(note, null, 2)}`);
 
-		if (note.id && !checkHttps(note.id)) {
+		if (note.id == null) {
+			throw new Error('Refusing to update note without id');
+		}
+
+		if (!checkHttps(note.id)) {
 			throw new Error('unexpected schema of note.id: ' + note.id);
 		}
 
@@ -376,18 +425,19 @@ export class ApNoteService {
 			throw new Error('unexpected schema of note url: ' + url);
 		}
 
-		this.logger.info(`Creating the Note: ${note.id}`);
+		if (url != null) {
+			if (!checkHttps(url)) {
+				throw new Error('unexpected schema of note url: ' + url);
+			}
 
-		// 投稿者をフェッチ
-		if (note.attributedTo == null) {
-			throw new Error('invalid note.attributedTo: ' + note.attributedTo);
+			if (this.utilityService.punyHost(url) !== this.utilityService.punyHost(note.id)) {
+				throw new Error(`note url <> id host mismatch: ${url} <> ${note.id}`);
+			}
 		}
 
-		const uri = getOneApId(note.attributedTo);
+		this.logger.info(`Creating the Note: ${note.id}`);
 
-		// ローカルで投稿者を検索し、もし凍結されていたらスキップ
-		const cachedActor = await this.apPersonService.fetchPerson(uri) as MiRemoteUser;
-		if (cachedActor && cachedActor.isSuspended) {
+		if (actor.isSuspended) {
 			throw new IdentifiableError('85ab9bd7-3a41-4530-959d-f07073900109', 'actor has been suspended');
 		}
 
@@ -419,13 +469,6 @@ export class ApNoteService {
 		}
 		//#endregion
 
-		const actor = cachedActor ?? await this.apPersonService.resolvePerson(uri, resolver) as MiRemoteUser;
-
-		// 投稿者が凍結されていたらスキップ
-		if (actor.isSuspended) {
-			throw new IdentifiableError('85ab9bd7-3a41-4530-959d-f07073900109', 'actor has been suspended');
-		}
-
 		const noteAudience = await this.apAudienceService.parseAudience(actor, note.to, note.cc, resolver);
 		let visibility = noteAudience.visibility;
 		const visibleUsers = noteAudience.visibleUsers;
@@ -578,7 +621,7 @@ export class ApNoteService {
 			if (exist) return exist;
 			//#endregion
 
-			if (uri.startsWith(this.config.url)) {
+			if (this.utilityService.isUriLocal(uri)) {
 				throw new StatusError('cannot resolve local note', 400, 'cannot resolve local note');
 			}
 
@@ -586,7 +629,7 @@ export class ApNoteService {
 			// ここでuriの代わりに添付されてきたNote Objectが指定されていると、サーバーフェッチを経ずにノートが生成されるが
 			// 添付されてきたNote Objectは偽装されている可能性があるため、常にuriを指定してサーバーフェッチを行う。
 			const createFrom = options.sentFrom?.origin === new URL(uri).origin ? value : uri;
-			return await this.createNote(createFrom, options.resolver, true);
+			return await this.createNote(createFrom, undefined, options.resolver, true);
 		} finally {
 			unlock();
 		}
diff --git a/packages/backend/src/core/activitypub/models/ApPersonService.ts b/packages/backend/src/core/activitypub/models/ApPersonService.ts
index ebe947f6b9..5cc1862167 100644
--- a/packages/backend/src/core/activitypub/models/ApPersonService.ts
+++ b/packages/backend/src/core/activitypub/models/ApPersonService.ts
@@ -7,6 +7,7 @@ import { Inject, Injectable } from '@nestjs/common';
 import promiseLimit from 'promise-limit';
 import { DataSource } from 'typeorm';
 import { ModuleRef } from '@nestjs/core';
+import { AbortError } from 'node-fetch';
 import { DI } from '@/di-symbols.js';
 import type { FollowingsRepository, InstancesRepository, MiMeta, UserProfilesRepository, UserPublickeysRepository, UsersRepository } from '@/models/_.js';
 import type { Config } from '@/config.js';
@@ -154,11 +155,24 @@ export class ApPersonService implements OnModuleInit {
 			throw new Error('invalid Actor: inbox has different host');
 		}
 
+		const sharedInboxObject = x.sharedInbox ?? (x.endpoints ? x.endpoints.sharedInbox : undefined);
+		if (sharedInboxObject != null) {
+			const sharedInbox = getApId(sharedInboxObject);
+			if (!(typeof sharedInbox === 'string' && sharedInbox.length > 0 && this.utilityService.punyHost(sharedInbox) === expectHost)) {
+				throw new Error('invalid Actor: wrong shared inbox');
+			}
+		}
+
 		for (const collection of ['outbox', 'followers', 'following'] as (keyof IActor)[]) {
-			const collectionUri = (x as IActor)[collection];
-			if (typeof collectionUri === 'string' && collectionUri.length > 0) {
-				if (this.utilityService.punyHost(collectionUri) !== expectHost) {
-					throw new Error(`invalid Actor: ${collection} has different host`);
+			const xCollection = (x as IActor)[collection];
+			if (xCollection != null) {
+				const collectionUri = getApId(xCollection);
+				if (typeof collectionUri === 'string' && collectionUri.length > 0) {
+					if (this.utilityService.punyHost(collectionUri) !== expectHost) {
+						throw new Error(`invalid Actor: ${collection} has different host`);
+					}
+				} else if (collectionUri != null) {
+					throw new Error(`invalid Actor: wrong ${collection}`);
 				}
 			}
 		}
@@ -286,7 +300,8 @@ export class ApPersonService implements OnModuleInit {
 	public async createPerson(uri: string, resolver?: Resolver): Promise<MiRemoteUser> {
 		if (typeof uri !== 'string') throw new Error('uri is not string');
 
-		if (uri.startsWith(this.config.url)) {
+		const host = this.utilityService.punyHost(uri);
+		if (host === this.utilityService.toPuny(this.config.host)) {
 			throw new StatusError('cannot resolve local user', 400, 'cannot resolve local user');
 		}
 
@@ -300,8 +315,6 @@ export class ApPersonService implements OnModuleInit {
 
 		this.logger.info(`Creating the Person: ${person.id}`);
 
-		const host = this.utilityService.punyHost(object.id);
-
 		const fields = this.analyzeAttachments(person.attachment ?? []);
 
 		const tags = extractApHashtags(person.tag).map(normalizeForSearch).splice(0, 32);
@@ -327,8 +340,18 @@ export class ApPersonService implements OnModuleInit {
 
 		const url = getOneApHrefNullable(person.url);
 
-		if (url && !checkHttps(url)) {
-			throw new Error('unexpected schema of person url: ' + url);
+		if (person.id == null) {
+			throw new Error('Refusing to create person without id');
+		}
+
+		if (url != null) {
+			if (!checkHttps(url)) {
+				throw new Error('unexpected schema of person url: ' + url);
+			}
+
+			if (this.utilityService.punyHost(url) !== this.utilityService.punyHost(person.id)) {
+				throw new Error(`person url <> uri host mismatch: ${url} <> ${person.id}`);
+			}
 		}
 
 		// Create user
@@ -482,7 +505,7 @@ export class ApPersonService implements OnModuleInit {
 		if (typeof uri !== 'string') throw new Error('uri is not string');
 
 		// URIがこのサーバーを指しているならスキップ
-		if (uri.startsWith(`${this.config.url}/`)) return;
+		if (this.utilityService.isUriLocal(uri)) return;
 
 		//#region このサーバーに既に登録されているか
 		const exist = await this.fetchPerson(uri) as MiRemoteUser | null;
@@ -531,8 +554,18 @@ export class ApPersonService implements OnModuleInit {
 
 		const url = getOneApHrefNullable(person.url);
 
-		if (url && !checkHttps(url)) {
-			throw new Error('unexpected schema of person url: ' + url);
+		if (person.id == null) {
+			throw new Error('Refusing to update person without id');
+		}
+
+		if (url != null) {
+			if (!checkHttps(url)) {
+				throw new Error('unexpected schema of person url: ' + url);
+			}
+
+			if (this.utilityService.punyHost(url) !== this.utilityService.punyHost(person.id)) {
+				throw new Error(`person url <> uri host mismatch: ${url} <> ${person.id}`);
+			}
 		}
 
 		const updates = {
@@ -692,7 +725,15 @@ export class ApPersonService implements OnModuleInit {
 		const _resolver = resolver ?? this.apResolverService.createResolver();
 
 		// Resolve to (Ordered)Collection Object
-		const collection = await _resolver.resolveCollection(user.featured);
+		const collection = await _resolver.resolveCollection(user.featured).catch(err => {
+			if (err instanceof AbortError || err instanceof StatusError) {
+				this.logger.warn(`Failed to update featured notes: ${err.name}: ${err.message}`);
+			} else {
+				this.logger.error('Failed to update featured notes:', err);
+			}
+		});
+		if (!collection) return;
+
 		if (!isCollectionOrOrderedCollection(collection)) throw new Error('Object is not Collection or OrderedCollection');
 
 		// Resolve to Object(may be Note) arrays
@@ -701,9 +742,10 @@ export class ApPersonService implements OnModuleInit {
 
 		// Resolve and regist Notes
 		const limit = promiseLimit<MiNote | null>(2);
+		const maxPinned = (await this.roleService.getUserPolicies(user.id)).pinLimit;
 		const featuredNotes = await Promise.all(items
 			.filter(item => getApType(item) === 'Note')	// TODO: Noteでなくてもいいかも
-			.slice(0, 5)
+			.slice(0, maxPinned)
 			.map(item => limit(() => this.apNoteService.resolveNote(item, {
 				resolver: _resolver,
 				sentFrom: new URL(user.uri),
@@ -749,7 +791,7 @@ export class ApPersonService implements OnModuleInit {
 			await this.updatePerson(src.movedToUri, undefined, undefined, [...movePreventUris, src.uri]);
 			dst = await this.fetchPerson(src.movedToUri) ?? dst;
 		} else {
-			if (src.movedToUri.startsWith(`${this.config.url}/`)) {
+			if (this.utilityService.isUriLocal(src.movedToUri)) {
 				// ローカルユーザーっぽいのにfetchPersonで見つからないということはmovedToUriが間違っている
 				return 'failed: movedTo is local but not found';
 			}
diff --git a/packages/backend/src/core/activitypub/models/ApQuestionService.ts b/packages/backend/src/core/activitypub/models/ApQuestionService.ts
index 9246398fde..83a98d17f9 100644
--- a/packages/backend/src/core/activitypub/models/ApQuestionService.ts
+++ b/packages/backend/src/core/activitypub/models/ApQuestionService.ts
@@ -5,16 +5,18 @@
 
 import { Inject, Injectable } from '@nestjs/common';
 import { DI } from '@/di-symbols.js';
-import type { NotesRepository, PollsRepository } from '@/models/_.js';
+import type { UsersRepository, NotesRepository, PollsRepository } from '@/models/_.js';
 import type { Config } from '@/config.js';
 import type { IPoll } from '@/models/Poll.js';
+import type { MiRemoteUser } from '@/models/User.js';
 import type Logger from '@/logger.js';
 import { bindThis } from '@/decorators.js';
-import { isQuestion } from '../type.js';
+import { UtilityService } from '@/core/UtilityService.js';
+import { getOneApId, isQuestion } from '../type.js';
 import { ApLoggerService } from '../ApLoggerService.js';
 import { ApResolverService } from '../ApResolverService.js';
 import type { Resolver } from '../ApResolverService.js';
-import type { IObject, IQuestion } from '../type.js';
+import type { IObject } from '../type.js';
 
 @Injectable()
 export class ApQuestionService {
@@ -24,6 +26,9 @@ export class ApQuestionService {
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.usersRepository)
+		private usersRepository: UsersRepository,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,
 
@@ -32,6 +37,7 @@ export class ApQuestionService {
 
 		private apResolverService: ApResolverService,
 		private apLoggerService: ApLoggerService,
+		private utilityService: UtilityService,
 	) {
 		this.logger = this.apLoggerService.logger;
 	}
@@ -65,12 +71,12 @@ export class ApQuestionService {
 	 * @returns true if updated
 	 */
 	@bindThis
-	public async updateQuestion(value: string | IObject, resolver?: Resolver): Promise<boolean> {
+	public async updateQuestion(value: string | IObject, actor?: MiRemoteUser, resolver?: Resolver): Promise<boolean> {
 		const uri = typeof value === 'string' ? value : value.id;
 		if (uri == null) throw new Error('uri is null');
 
 		// URIがこのサーバーを指しているならスキップ
-		if (uri.startsWith(this.config.url + '/')) throw new Error('uri points local');
+		if (this.utilityService.isUriLocal(uri)) throw new Error('uri points local');
 
 		//#region このサーバーに既に登録されているか
 		const note = await this.notesRepository.findOneBy({ uri });
@@ -78,15 +84,26 @@ export class ApQuestionService {
 
 		const poll = await this.pollsRepository.findOneBy({ noteId: note.id });
 		if (poll == null) throw new Error('Question is not registered');
+
+		const user = await this.usersRepository.findOneBy({ id: poll.userId });
+		if (user == null) throw new Error('Question is not registered');
 		//#endregion
 
 		// resolve new Question object
 		// eslint-disable-next-line no-param-reassign
 		if (resolver == null) resolver = this.apResolverService.createResolver();
-		const question = await resolver.resolve(value) as IQuestion;
+		const question = await resolver.resolve(value);
 		this.logger.debug(`fetched question: ${JSON.stringify(question, null, 2)}`);
 
-		if (question.type !== 'Question') throw new Error('object is not a Question');
+		if (!isQuestion(question)) throw new Error('object is not a Question');
+
+		const attribution = (question.attributedTo) ? getOneApId(question.attributedTo) : user.uri;
+		const attributionMatchesExisting = attribution === user.uri;
+		const actorMatchesAttribution = (actor) ? attribution === actor.uri : true;
+
+		if (!attributionMatchesExisting || !actorMatchesAttribution) {
+			throw new Error('Refusing to ingest update for poll by different user');
+		}
 
 		const apChoices = question.oneOf ?? question.anyOf;
 		if (apChoices == null) throw new Error('invalid apChoices: ' + apChoices);
@@ -96,7 +113,7 @@ export class ApQuestionService {
 		for (const choice of poll.choices) {
 			const oldCount = poll.votes[poll.choices.indexOf(choice)];
 			const newCount = apChoices.filter(ap => ap.name === choice).at(0)?.replies?.totalItems;
-			if (newCount == null) throw new Error('invalid newCount: ' + newCount);
+			if (newCount == null || !(Number.isInteger(newCount) && newCount >= 0)) throw new Error('invalid newCount: ' + newCount);
 
 			if (oldCount <= newCount) {
 				changed = true;
diff --git a/packages/backend/src/core/chart/ChartManagementService.ts b/packages/backend/src/core/chart/ChartManagementService.ts
index 79681370a1..316feec6ee 100644
--- a/packages/backend/src/core/chart/ChartManagementService.ts
+++ b/packages/backend/src/core/chart/ChartManagementService.ts
@@ -6,6 +6,8 @@
 import { Injectable } from '@nestjs/common';
 
 import { bindThis } from '@/decorators.js';
+import { ChartLoggerService } from '@/core/chart/ChartLoggerService.js';
+import Logger from '@/logger.js';
 import FederationChart from './charts/federation.js';
 import NotesChart from './charts/notes.js';
 import UsersChart from './charts/users.js';
@@ -24,6 +26,7 @@ import type { OnApplicationShutdown } from '@nestjs/common';
 export class ChartManagementService implements OnApplicationShutdown {
 	private charts;
 	private saveIntervalId: NodeJS.Timeout;
+	private readonly logger: Logger;
 
 	constructor(
 		private federationChart: FederationChart,
@@ -38,6 +41,7 @@ export class ChartManagementService implements OnApplicationShutdown {
 		private perUserFollowingChart: PerUserFollowingChart,
 		private perUserDriveChart: PerUserDriveChart,
 		private apRequestChart: ApRequestChart,
+		private chartLoggerService: ChartLoggerService,
 	) {
 		this.charts = [
 			this.federationChart,
@@ -53,6 +57,7 @@ export class ChartManagementService implements OnApplicationShutdown {
 			this.perUserDriveChart,
 			this.apRequestChart,
 		];
+		this.logger = chartLoggerService.logger;
 	}
 
 	@bindThis
@@ -62,6 +67,7 @@ export class ChartManagementService implements OnApplicationShutdown {
 			for (const chart of this.charts) {
 				chart.save();
 			}
+			this.logger.info('All charts saved');
 		}, 1000 * 60 * 20);
 	}
 
@@ -72,6 +78,7 @@ export class ChartManagementService implements OnApplicationShutdown {
 			await Promise.all(
 				this.charts.map(chart => chart.save()),
 			);
+			this.logger.info('All charts saved');
 		}
 	}
 
diff --git a/packages/backend/src/core/chart/core.ts b/packages/backend/src/core/chart/core.ts
index af5485a46e..234c1d63b4 100644
--- a/packages/backend/src/core/chart/core.ts
+++ b/packages/backend/src/core/chart/core.ts
@@ -368,7 +368,7 @@ export default abstract class Chart<T extends Schema> {
 			// 初期ログデータを作成
 			data = this.getNewLog(null);
 
-			this.logger.info(`${this.name + (group ? `:${group}` : '')}(${span}): Initial commit created`);
+			this.logger.debug(`${this.name + (group ? `:${group}` : '')}(${span}): Initial commit created`);
 		}
 
 		const date = Chart.dateToTimestamp(current);
@@ -398,7 +398,7 @@ export default abstract class Chart<T extends Schema> {
 				...columns,
 			}) as RawRecord<T>;
 
-			this.logger.info(`${this.name + (group ? `:${group}` : '')}(${span}): New commit created`);
+			this.logger.debug(`${this.name + (group ? `:${group}` : '')}(${span}): New commit created`);
 
 			return log;
 		} finally {
@@ -418,7 +418,7 @@ export default abstract class Chart<T extends Schema> {
 	@bindThis
 	public async save(): Promise<void> {
 		if (this.buffer.length === 0) {
-			this.logger.info(`${this.name}: Write skipped`);
+			this.logger.debug(`${this.name}: Write skipped`);
 			return;
 		}
 
@@ -519,7 +519,7 @@ export default abstract class Chart<T extends Schema> {
 					.execute(),
 			]);
 
-			this.logger.info(`${this.name + (logHour.group ? `:${logHour.group}` : '')}: Updated`);
+			this.logger.debug(`${this.name + (logHour.group ? `:${logHour.group}` : '')}: Updated`);
 
 			// TODO: この一連の処理が始まった後に新たにbufferに入ったものは消さないようにする
 			this.buffer = this.buffer.filter(q => q.group != null && (q.group !== logHour.group));
diff --git a/packages/backend/src/core/entities/NoteEntityService.ts b/packages/backend/src/core/entities/NoteEntityService.ts
index 1631daad88..ab9c72cfbe 100644
--- a/packages/backend/src/core/entities/NoteEntityService.ts
+++ b/packages/backend/src/core/entities/NoteEntityService.ts
@@ -17,6 +17,7 @@ import { DebounceLoader } from '@/misc/loader.js';
 import { IdService } from '@/core/IdService.js';
 import { ReactionsBufferingService } from '@/core/ReactionsBufferingService.js';
 import type { OnModuleInit } from '@nestjs/common';
+import type { CacheService } from '../CacheService.js';
 import type { CustomEmojiService } from '../CustomEmojiService.js';
 import type { ReactionService } from '../ReactionService.js';
 import type { UserEntityService } from './UserEntityService.js';
@@ -51,6 +52,7 @@ function getAppearNoteIds(notes: MiNote[]): Set<string> {
 export class NoteEntityService implements OnModuleInit {
 	private userEntityService: UserEntityService;
 	private driveFileEntityService: DriveFileEntityService;
+	private cacheService: CacheService;
 	private customEmojiService: CustomEmojiService;
 	private reactionService: ReactionService;
 	private reactionsBufferingService: ReactionsBufferingService;
@@ -99,6 +101,7 @@ export class NoteEntityService implements OnModuleInit {
 	onModuleInit() {
 		this.userEntityService = this.moduleRef.get('UserEntityService');
 		this.driveFileEntityService = this.moduleRef.get('DriveFileEntityService');
+		this.cacheService = this.moduleRef.get('CacheService');
 		this.customEmojiService = this.moduleRef.get('CustomEmojiService');
 		this.reactionService = this.moduleRef.get('ReactionService');
 		this.reactionsBufferingService = this.moduleRef.get('ReactionsBufferingService');
@@ -166,6 +169,12 @@ export class NoteEntityService implements OnModuleInit {
 			}
 		}
 
+		if (!hide && meId && packedNote.userId !== meId) {
+			const isBlocked = (await this.cacheService.userBlockedCache.fetch(meId)).has(packedNote.userId);
+
+			if (isBlocked) hide = true;
+		}
+
 		if (hide) {
 			packedNote.visibleUserIds = undefined;
 			packedNote.fileIds = [];
@@ -173,6 +182,12 @@ export class NoteEntityService implements OnModuleInit {
 			packedNote.text = null;
 			packedNote.poll = undefined;
 			packedNote.cw = null;
+			packedNote.repliesCount = 0;
+			packedNote.reactionAcceptance = null;
+			packedNote.reactionAndUserPairCache = undefined;
+			packedNote.reactionCount = 0;
+			packedNote.reactionEmojis = undefined;
+			packedNote.reactions = undefined;
 			packedNote.isHidden = true;
 		}
 	}
@@ -286,7 +301,8 @@ export class NoteEntityService implements OnModuleInit {
 				return true;
 			} else {
 				// フォロワーかどうか
-				const [following, user] = await Promise.all([
+				const [blocked, following, user] = await Promise.all([
+					this.cacheService.userBlockingCache.fetch(meId).then((ids) => ids.has(note.userId)),
 					this.followingsRepository.count({
 						where: {
 							followeeId: note.userId,
@@ -297,6 +313,8 @@ export class NoteEntityService implements OnModuleInit {
 					this.usersRepository.findOneByOrFail({ id: meId }),
 				]);
 
+				if (blocked) return false;
+
 				/* If we know the following, everyhting is fine.
 
 				But if we do not know the following, it might be that both the
@@ -308,6 +326,12 @@ export class NoteEntityService implements OnModuleInit {
 			}
 		}
 
+		if (meId != null) {
+			const isBlocked = (await this.cacheService.userBlockedCache.fetch(meId)).has(note.userId);
+
+			if (isBlocked) return false;
+		}
+
 		return true;
 	}
 
diff --git a/packages/backend/src/queue/processors/InboxProcessorService.ts b/packages/backend/src/queue/processors/InboxProcessorService.ts
index 7a321e60f3..f5a356db55 100644
--- a/packages/backend/src/queue/processors/InboxProcessorService.ts
+++ b/packages/backend/src/queue/processors/InboxProcessorService.ts
@@ -192,6 +192,8 @@ export class InboxProcessorService implements OnApplicationShutdown {
 			if (signerHost !== activityIdHost) {
 				throw new Bull.UnrecoverableError(`skip: signerHost(${signerHost}) !== activity.id host(${activityIdHost}`);
 			}
+		} else {
+			throw new Bull.UnrecoverableError('skip: activity id is not a string');
 		}
 
 		this.apRequestChart.inbox();
diff --git a/packages/backend/src/server/ActivityPubServerService.ts b/packages/backend/src/server/ActivityPubServerService.ts
index 52592c47c6..f955329fd1 100644
--- a/packages/backend/src/server/ActivityPubServerService.ts
+++ b/packages/backend/src/server/ActivityPubServerService.ts
@@ -152,7 +152,7 @@ export class ActivityPubServerService {
 		let signature;
 
 		try {
-			signature = httpSignature.parseRequest(request.raw, { 'headers': [] });
+			signature = httpSignature.parseRequest(request.raw, { 'headers': ['(request-target)', 'host', 'date'], authorizationHeaderName: 'signature' });
 		} catch (e) {
 			// not signed, or malformed signature: refuse
 			this.authlogger.warn(`${request.id} ${request.url} not signed, or malformed signature: refuse`);
@@ -229,7 +229,7 @@ export class ActivityPubServerService {
 		let signature;
 
 		try {
-			signature = httpSignature.parseRequest(request.raw, { 'headers': [] });
+			signature = httpSignature.parseRequest(request.raw, { 'headers': ['(request-target)', 'digest', 'host', 'date'], authorizationHeaderName: 'signature' });
 		} catch (e) {
 			reply.code(401);
 			return;
diff --git a/packages/backend/src/server/FileServerService.ts b/packages/backend/src/server/FileServerService.ts
index 1a4d0cb48f..be196373c4 100644
--- a/packages/backend/src/server/FileServerService.ts
+++ b/packages/backend/src/server/FileServerService.ts
@@ -28,7 +28,11 @@ import { bindThis } from '@/decorators.js';
 import { isMimeImage } from '@/misc/is-mime-image.js';
 import { correctFilename } from '@/misc/correct-filename.js';
 import { handleRequestRedirectToOmitSearch } from '@/misc/fastify-hook-handlers.js';
+import { RateLimiterService } from '@/server/api/RateLimiterService.js';
+import { getIpHash } from '@/misc/get-ip-hash.js';
+import { AuthenticateService } from '@/server/api/AuthenticateService.js';
 import type { FastifyInstance, FastifyRequest, FastifyReply, FastifyPluginOptions } from 'fastify';
+import type Limiter from 'ratelimiter';
 
 const _filename = fileURLToPath(import.meta.url);
 const _dirname = dirname(_filename);
@@ -52,6 +56,8 @@ export class FileServerService {
 		private videoProcessingService: VideoProcessingService,
 		private internalStorageService: InternalStorageService,
 		private loggerService: LoggerService,
+		private authenticateService: AuthenticateService,
+		private rateLimiterService: RateLimiterService,
 	) {
 		this.logger = this.loggerService.getLogger('server', 'gray');
 
@@ -76,6 +82,8 @@ export class FileServerService {
 			});
 
 			fastify.get<{ Params: { key: string; } }>('/files/:key', async (request, reply) => {
+				if (!await this.checkRateLimit(request, reply, `/files/${request.params.key}`)) return;
+
 				return await this.sendDriveFile(request, reply)
 					.catch(err => this.errorHandler(request, reply, err));
 			});
@@ -89,6 +97,20 @@ export class FileServerService {
 			Params: { url: string; };
 			Querystring: { url?: string; };
 		}>('/proxy/:url*', async (request, reply) => {
+			const url = 'url' in request.query ? request.query.url : 'https://' + request.params.url;
+			if (!url || !URL.canParse(url)) {
+				reply.code(400);
+				return;
+			}
+
+			const keyUrl = new URL(url);
+			keyUrl.searchParams.forEach(k => keyUrl.searchParams.delete(k));
+			keyUrl.hash = '';
+			keyUrl.username = '';
+			keyUrl.password = '';
+
+			if (!await this.checkRateLimit(request, reply, `/proxy/${keyUrl}`)) return;
+
 			return await this.proxyHandler(request, reply)
 				.catch(err => this.errorHandler(request, reply, err));
 		});
@@ -572,4 +594,71 @@ export class FileServerService {
 			path,
 		};
 	}
+
+	// Based on ApiCallService
+	private async checkRateLimit(
+		request: FastifyRequest<{
+			Body?: Record<string, unknown> | undefined,
+			Querystring?: Record<string, unknown> | undefined,
+			Params?: Record<string, unknown> | unknown,
+		}>,
+		reply: FastifyReply,
+		rateLimitKey: string,
+	): Promise<boolean> {
+		const body = request.method === 'GET'
+			? request.query
+			: request.body;
+
+		// https://datatracker.ietf.org/doc/html/rfc6750.html#section-2.1 (case sensitive)
+		const token = request.headers.authorization?.startsWith('Bearer ')
+			? request.headers.authorization.slice(7)
+			: body?.['i'];
+		if (token != null && typeof token !== 'string') {
+			reply.code(400);
+			return false;
+		}
+
+		// koa will automatically load the `X-Forwarded-For` header if `proxy: true` is configured in the app.
+		const [user] = await this.authenticateService.authenticate(token);
+		const actor = user?.id ?? getIpHash(request.ip);
+
+		const limit = {
+			// Group by resource
+			key: rateLimitKey,
+
+			// Maximum of 10 requests / 10 minutes
+			max: 10,
+			duration: 1000 * 60 * 10,
+
+			// Minimum of 250 ms between each request
+			minInterval: 250,
+		};
+
+		// Rate limit proxy requests
+		try {
+			await this.rateLimiterService.limit(limit, actor);
+			return true;
+		} catch (err) {
+			// errはLimiter.LimiterInfoであることが期待される
+			reply.code(429);
+
+			if (hasRateLimitInfo(err)) {
+				const cooldownInSeconds = Math.ceil((err.info.resetMs - Date.now()) / 1000);
+				// もしかするとマイナスになる可能性がなくはないのでマイナスだったら0にしておく
+				reply.header('Retry-After', Math.max(cooldownInSeconds, 0).toString(10));
+			}
+
+			reply.send({
+				message: 'Rate limit exceeded. Please try again later.',
+				code: 'RATE_LIMIT_EXCEEDED',
+				id: 'd5826d14-3982-4d2e-8011-b9e9f02499ef',
+			});
+
+			return false;
+		}
+	}
+}
+
+function hasRateLimitInfo(err: unknown): err is { info: Limiter.LimiterInfo } {
+	return err != null && typeof(err) === 'object' && 'info' in err;
 }
diff --git a/packages/backend/src/server/api/endpoints/ap/get.ts b/packages/backend/src/server/api/endpoints/ap/get.ts
index d8c55de7ec..14286bc23e 100644
--- a/packages/backend/src/server/api/endpoints/ap/get.ts
+++ b/packages/backend/src/server/api/endpoints/ap/get.ts
@@ -11,6 +11,7 @@ import { ApResolverService } from '@/core/activitypub/ApResolverService.js';
 export const meta = {
 	tags: ['federation'],
 
+	requireAdmin: true,
 	requireCredential: true,
 	kind: 'read:federation',
 
diff --git a/packages/backend/src/server/api/endpoints/ap/show.ts b/packages/backend/src/server/api/endpoints/ap/show.ts
index a877d1ce0d..4232bc6e39 100644
--- a/packages/backend/src/server/api/endpoints/ap/show.ts
+++ b/packages/backend/src/server/api/endpoints/ap/show.ts
@@ -140,7 +140,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		return await this.mergePack(
 			me,
 			isActor(object) ? await this.apPersonService.createPerson(getApId(object)) : null,
-			isPost(object) ? await this.apNoteService.createNote(getApId(object), undefined, true) : null,
+			isPost(object) ? await this.apNoteService.createNote(getApId(object), undefined, undefined, true) : null,
 		);
 	}
 
diff --git a/packages/backend/src/server/api/endpoints/emojis.ts b/packages/backend/src/server/api/endpoints/emojis.ts
index 46ef4eca1b..4dd3a2ed50 100644
--- a/packages/backend/src/server/api/endpoints/emojis.ts
+++ b/packages/backend/src/server/api/endpoints/emojis.ts
@@ -50,16 +50,11 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private emojiEntityService: EmojiEntityService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
-			const emojis = await this.emojisRepository.find({
-				where: {
-					host: IsNull(),
-				},
-				order: {
-					category: 'ASC',
-					name: 'ASC',
-				},
-			});
-
+			const emojis = await this.emojisRepository.createQueryBuilder()
+				.where('host IS NULL')
+				.orderBy('LOWER(category)', 'ASC')
+				.orderBy('LOWER(name)', 'ASC')
+				.getMany();
 			return {
 				emojis: await this.emojiEntityService.packSimpleMany(emojis),
 			};
diff --git a/packages/backend/src/server/api/endpoints/users/report-abuse.ts b/packages/backend/src/server/api/endpoints/users/report-abuse.ts
index 5ff6de37d2..38ded8ee1e 100644
--- a/packages/backend/src/server/api/endpoints/users/report-abuse.ts
+++ b/packages/backend/src/server/api/endpoints/users/report-abuse.ts
@@ -66,10 +66,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				throw new ApiError(meta.errors.cannotReportYourself);
 			}
 
-			if (await this.roleService.isAdministrator(targetUser)) {
-				throw new ApiError(meta.errors.cannotReportAdmin);
-			}
-
 			await this.abuseReportService.report([{
 				targetUserId: targetUser.id,
 				targetUserHost: targetUser.host,
diff --git a/packages/backend/src/server/web/UrlPreviewService.ts b/packages/backend/src/server/web/UrlPreviewService.ts
index 981fbb4353..19dac1dfb8 100644
--- a/packages/backend/src/server/web/UrlPreviewService.ts
+++ b/packages/backend/src/server/web/UrlPreviewService.ts
@@ -6,6 +6,7 @@
 import { Inject, Injectable } from '@nestjs/common';
 import { summaly } from '@misskey-dev/summaly';
 import { SummalyResult } from '@misskey-dev/summaly/built/summary.js';
+import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
@@ -15,9 +16,9 @@ import { LoggerService } from '@/core/LoggerService.js';
 import { bindThis } from '@/decorators.js';
 import { ApiError } from '@/server/api/error.js';
 import { MiMeta } from '@/models/Meta.js';
-import type { FastifyRequest, FastifyReply } from 'fastify';
-import * as Redis from 'ioredis';
 import { RedisKVCache } from '@/misc/cache.js';
+import { UtilityService } from '@/core/UtilityService.js';
+import type { FastifyRequest, FastifyReply } from 'fastify';
 
 @Injectable()
 export class UrlPreviewService {
@@ -36,12 +37,13 @@ export class UrlPreviewService {
 
 		private httpRequestService: HttpRequestService,
 		private loggerService: LoggerService,
+		private utilityService: UtilityService,
 	) {
 		this.logger = this.loggerService.getLogger('url-preview');
 		this.previewCache = new RedisKVCache<SummalyResult>(this.redisClient, 'summaly', {
 			lifetime: 1000 * 60 * 60 * 24, // 1d
 			memoryCacheLifetime: 1000 * 60 * 10, // 10m
-			fetcher: (key: string) => { throw new Error('the UrlPreview cache should never fetch'); },
+			fetcher: () => { throw new Error('the UrlPreview cache should never fetch'); },
 			toRedisConverter: (value) => JSON.stringify(value),
 			fromRedisConverter: (value) => JSON.parse(value),
 		});
@@ -65,7 +67,7 @@ export class UrlPreviewService {
 		reply: FastifyReply,
 	): Promise<object | undefined> {
 		const url = request.query.url;
-		if (typeof url !== 'string') {
+		if (typeof url !== 'string' || !URL.canParse(url)) {
 			reply.code(400);
 			return;
 		}
@@ -87,6 +89,18 @@ export class UrlPreviewService {
 			};
 		}
 
+		const host = new URL(url).host;
+		if (this.utilityService.isBlockedHost(this.meta.blockedHosts, host)) {
+			reply.code(403);
+			return {
+				error: new ApiError({
+					message: 'URL is blocked',
+					code: 'URL_PREVIEW_BLOCKED',
+					id: '50294652-857b-4b13-9700-8e5c7a8deae8',
+				}),
+			};
+		}
+
 		const key = `${url}@${lang}`;
 		const cached = await this.previewCache.get(key);
 		if (cached !== undefined) {
@@ -170,6 +184,6 @@ export class UrlPreviewService {
 			contentLengthRequired: meta.urlPreviewRequireContentLength,
 		});
 
-		return this.httpRequestService.getJson<SummalyResult>(`${proxy}?${queryStr}`);
+		return this.httpRequestService.getJson<SummalyResult>(`${proxy}?${queryStr}`, 'application/json, */*', undefined, true);
 	}
 }
diff --git a/packages/backend/test/unit/activitypub.ts b/packages/backend/test/unit/activitypub.ts
index 53ced3dab3..73d6186edf 100644
--- a/packages/backend/test/unit/activitypub.ts
+++ b/packages/backend/test/unit/activitypub.ts
@@ -176,7 +176,7 @@ describe('ActivityPub', () => {
 			resolver.register(actor.id, actor);
 			resolver.register(post.id, post);
 
-			const note = await noteService.createNote(post.id, resolver, true);
+			const note = await noteService.createNote(post.id, undefined, resolver, true);
 
 			assert.deepStrictEqual(note?.uri, post.id);
 			assert.deepStrictEqual(note.visibility, 'public');
@@ -336,7 +336,7 @@ describe('ActivityPub', () => {
 			resolver.register(actor.featured, featured);
 			resolver.register(firstNote.id, firstNote);
 
-			const note = await noteService.createNote(firstNote.id as string, resolver);
+			const note = await noteService.createNote(firstNote.id as string, undefined, resolver);
 			assert.strictEqual(note?.uri, firstNote.id);
 		});
 	});
diff --git a/packages/frontend/src/components/MkUserPopup.vue b/packages/frontend/src/components/MkUserPopup.vue
index 2bdf854d1e..a5e70deed5 100644
--- a/packages/frontend/src/components/MkUserPopup.vue
+++ b/packages/frontend/src/components/MkUserPopup.vue
@@ -119,7 +119,7 @@ onMounted(() => {
 	}
 
 	const rect = props.source.getBoundingClientRect();
-	const x = ((rect.left + (props.source.offsetWidth / 2)) - (300 / 2)) + window.scrollX;
+	const x = Math.max(1, ((rect.left + (props.source.offsetWidth / 2)) - (300 / 2)) + window.scrollX);
 	const y = rect.top + props.source.offsetHeight + window.scrollY;
 
 	top.value = y;
diff --git a/packages/frontend/src/components/SkModPlayer.vue b/packages/frontend/src/components/SkModPlayer.vue
index 8607bca45d..f44c4ae7f9 100644
--- a/packages/frontend/src/components/SkModPlayer.vue
+++ b/packages/frontend/src/components/SkModPlayer.vue
@@ -451,6 +451,7 @@ onDeactivated(() => {
 	overflow: hidden;
 	display: flex;
 	flex-direction: column;
+	justify-content: center;
 
 	> i {
 		display: block;
diff --git a/packages/frontend/src/scripts/popup-position.ts b/packages/frontend/src/scripts/popup-position.ts
index 3dad41a8b3..be49532cf8 100644
--- a/packages/frontend/src/scripts/popup-position.ts
+++ b/packages/frontend/src/scripts/popup-position.ts
@@ -15,6 +15,8 @@ export function calcPopupPosition(el: HTMLElement, props: {
 	const contentWidth = el.offsetWidth;
 	const contentHeight = el.offsetHeight;
 
+	const HORIZONTAL_MARGIN = 1;
+
 	let rect: DOMRect;
 
 	if (props.anchorElement) {
@@ -36,9 +38,11 @@ export function calcPopupPosition(el: HTMLElement, props: {
 		left -= (el.offsetWidth / 2);
 
 		if (left + contentWidth - window.scrollX > window.innerWidth) {
-			left = window.innerWidth - contentWidth + window.scrollX - 1;
+			left = window.innerWidth - contentWidth + window.scrollX - HORIZONTAL_MARGIN;
 		}
 
+		left = Math.max(HORIZONTAL_MARGIN, left);
+
 		return [left, top];
 	};
 
@@ -57,9 +61,11 @@ export function calcPopupPosition(el: HTMLElement, props: {
 		left -= (el.offsetWidth / 2);
 
 		if (left + contentWidth - window.scrollX > window.innerWidth) {
-			left = window.innerWidth - contentWidth + window.scrollX - 1;
+			left = window.innerWidth - contentWidth + window.scrollX - HORIZONTAL_MARGIN;
 		}
 
+		left = Math.max(HORIZONTAL_MARGIN, left);
+
 		return [left, top];
 	};
 
@@ -75,6 +81,8 @@ export function calcPopupPosition(el: HTMLElement, props: {
 			top = props.y;
 		}
 
+		left = Math.max(HORIZONTAL_MARGIN, left);
+
 		top -= (el.offsetHeight / 2);
 
 		if (top + contentHeight - window.scrollY > window.innerHeight) {
@@ -106,6 +114,8 @@ export function calcPopupPosition(el: HTMLElement, props: {
 			top -= (el.offsetHeight / 2);
 		}
 
+		left = Math.max(HORIZONTAL_MARGIN, left);
+
 		if (top + contentHeight - window.scrollY > window.innerHeight) {
 			top = window.innerHeight - contentHeight + window.scrollY - 1;
 		}