check tenants before showing "remote user" warning

.config/ci.yml

@@ -79,6 +79,14 @@
 # Final accessible URL seen by a user.
 url: http://misskey.local
 
+# Other public URLs that are served by this instance.
+# If you've migrated to a new domain using an existing database, then add your previous URL here to continue serving those posts and profiles via federation.
+# Requires reverse-proxy configuration to forward requests with HOST header preserved.
+# For advanced usage only!
+#altUrls:
+#  - https://example.com/
+#  - https://legacy.tld/
+
 # ONCE YOU HAVE STARTED THE INSTANCE, DO NOT CHANGE THE
 # URL SETTINGS AFTER THAT!
 

.config/cypress-devcontainer.yml

@@ -21,6 +21,14 @@ setupPassword: example_password_please_change_this_or_you_will_get_hacked
 # Final accessible URL seen by a user.
 url: 'http://misskey.local'
 
+# Other public URLs that are served by this instance.
+# If you've migrated to a new domain using an existing database, then add your previous URL here to continue serving those posts and profiles via federation.
+# Requires reverse-proxy configuration to forward requests with HOST header preserved.
+# For advanced usage only!
+#altUrls:
+#  - https://example.com/
+#  - https://legacy.tld/
+
 # ONCE YOU HAVE STARTED THE INSTANCE, DO NOT CHANGE THE
 # URL SETTINGS AFTER THAT!
 

.config/docker_example.yml

@@ -80,6 +80,14 @@
 # You can set url from an environment variable instead.
 url: https://example.tld/
 
+# Other public URLs that are served by this instance.
+# If you've migrated to a new domain using an existing database, then add your previous URL here to continue serving those posts and profiles via federation.
+# Requires reverse-proxy configuration to forward requests with HOST header preserved.
+# For advanced usage only!
+#altUrls:
+#  - https://example.com/
+#  - https://legacy.tld/
+
 # ONCE YOU HAVE STARTED THE INSTANCE, DO NOT CHANGE THE
 # URL SETTINGS AFTER THAT!
 

.config/example.yml

@@ -79,6 +79,14 @@
 # Final accessible URL seen by a user.
 url: https://example.tld/
 
+# Other public URLs that are served by this instance.
+# If you've migrated to a new domain using an existing database, then add your previous URL here to continue serving those posts and profiles via federation.
+# Requires reverse-proxy configuration to forward requests with HOST header preserved.
+# For advanced usage only!
+#altUrls:
+#  - https://example.com/
+#  - https://legacy.tld/
+
 # ONCE YOU HAVE STARTED THE INSTANCE, DO NOT CHANGE THE
 # URL SETTINGS AFTER THAT!
 

packages/backend/src/config.ts

@@ -27,6 +27,7 @@ type RedisOptionsSource = Partial<RedisOptions> & {
  */
 type Source = {
 	url?: string;
+	altUrls?: string[];
 	port?: number;
 	address?: string;
 	socket?: string;
@@ -151,7 +152,7 @@ type Source = {
 	}
 };
 
-export type Config = {
+export type Config = Tenant & {
 	url: string;
 	port: number;
 	address: string;
@@ -273,6 +274,8 @@ export type Config = {
 		maxAge: number;
 	};
 
+	alts: Tenant[];
+
 	websocketCompression?: boolean;
 
 	customHtml: {
@@ -280,6 +283,18 @@ export type Config = {
 	}
 };
 
+export type Tenant = {
+	url: string;
+	host: string;
+	hostname: string;
+	scheme: string;
+	wsScheme: string;
+	apiUrl: string;
+	wsUrl: string;
+	authUrl: string;
+	driveUrl: string;
+};
+
 export type FulltextSearchProvider = 'sqlLike' | 'sqlPgroonga' | 'meilisearch' | 'sqlTsvector';
 
 const _filename = fileURLToPath(import.meta.url);
@@ -345,6 +360,24 @@ export function loadConfig(): Config {
 	const internalMediaProxy = `${scheme}://${host}/proxy`;
 	const redis = convertRedisOptions(config.redis, host);
 
+	const alts: Tenant[] = config.altUrls?.map(alt => {
+		const altUrl = tryCreateUrl(alt);
+		const altHost = altUrl.host;
+		const altScheme = altUrl.protocol.replace(/:$/, '');
+		const altWsScheme = altScheme.replace('http', 'ws');
+		return {
+			url: alt,
+			host: altHost,
+			hostname: altUrl.hostname,
+			scheme: altScheme,
+			wsScheme: altWsScheme,
+			wsUrl: `${altWsScheme}://${altHost}`,
+			apiUrl: `${altWsScheme}://${altHost}/api`,
+			authUrl: `${altWsScheme}://${altHost}/auth`,
+			driveUrl: `${altWsScheme}://${altHost}/files`,
+		};
+	}) ?? [];
+
 	return {
 		version,
 		publishTarballInsteadOfProvideRepositoryUrl: !!config.publishTarballInsteadOfProvideRepositoryUrl,
@@ -427,6 +460,7 @@ export function loadConfig(): Config {
 			preSave: config.activityLogging?.preSave ?? false,
 			maxAge: config.activityLogging?.maxAge ?? (1000 * 60 * 60 * 24 * 30),
 		},
+		alts,
 		websocketCompression: config.websocketCompression ?? false,
 		customHtml: {
 			head: config.customHtml?.head ?? '',

packages/backend/src/core/DeleteAccountService.ts

@@ -15,6 +15,7 @@ import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
 import { ModerationLogService } from '@/core/ModerationLogService.js';
 import { SystemAccountService } from '@/core/SystemAccountService.js';
 import { isSystemAccount } from '@/misc/is-system-account.js';
+import type { MiPartialUser } from '@/models/User.js';
 
 @Injectable()
 export class DeleteAccountService {
@@ -38,10 +39,7 @@ export class DeleteAccountService {
 	}
 
 	@bindThis
-	public async deleteAccount(user: {
+	public async deleteAccount(user: MiPartialUser, moderator?: MiUser): Promise<void> {
-		id: string;
-		host: string | null;
-	}, moderator?: MiUser): Promise<void> {
 		if (this.meta.rootUserId === user.id) throw new Error('cannot delete a root account');
 
 		const _user = await this.usersRepository.findOneByOrFail({ id: user.id });

packages/backend/src/core/DriveService.ts

@@ -71,7 +71,9 @@ type AddFileArgs = {
 	ext?: string | null;
 
 	requestIp?: string | null;
-	requestHeaders?: Record<string, string> | null;
+	requestHeaders?: {
+		[Name in string]?: string | string[]
+	} | null;
 };
 
 type UploadFromUrlArgs = {
@@ -84,7 +86,9 @@ type UploadFromUrlArgs = {
 	isLink?: boolean;
 	comment?: string | null;
 	requestIp?: string | null;
-	requestHeaders?: Record<string, string> | null;
+	requestHeaders?: {
+		[Name in string]?: string | string[]
+	} | null;
 };
 
 @Injectable()
@@ -583,6 +587,17 @@ export class DriveService {
 
 		const folder = await fetchFolder();
 
+		const headers: Record<string, string> = {};
+		if (requestHeaders) {
+			for (const [name, value] of Object.entries(requestHeaders)) {
+				if (Array.isArray(value)) {
+					headers[name] = value.join();
+				} else if (value) {
+					headers[name] = value;
+				}
+			}
+		}
+
 		let file = new MiDriveFile();
 		file.id = this.idService.gen();
 		file.userId = user ? user.id : null;
@@ -593,7 +608,7 @@ export class DriveService {
 		file.blurhash = info.blurhash ?? null;
 		file.isLink = isLink;
 		file.requestIp = requestIp;
-		file.requestHeaders = requestHeaders;
+		file.requestHeaders = headers;
 		file.maybeSensitive = info.sensitive;
 		file.maybePorn = info.porn;
 		file.isSensitive = user

packages/backend/src/core/NoteCreateService.ts

@@ -875,8 +875,8 @@ export class NoteCreateService implements OnApplicationShutdown {
 		if (data.localOnly) return null;
 
 		const content = this.isRenote(data) && !this.isQuote(data)
-			? this.apRendererService.renderAnnounce(data.renote.uri ? data.renote.uri : `${this.config.url}/notes/${data.renote.id}`, note)
+			? this.apRendererService.renderAnnounce(data.renote.uri ? data.renote.uri : `${this.config.url}/notes/${data.renote.id}`, note, user)
-			: this.apRendererService.renderCreate(await this.apRendererService.renderNote(note, user, false), note);
+			: this.apRendererService.renderCreate(await this.apRendererService.renderNote(note, user, false), note, user);
 
 		return this.apRendererService.addContext(content);
 	}

packages/backend/src/core/NoteDeleteService.ts

@@ -5,7 +5,7 @@
 
 import { Brackets, In, IsNull, Not } from 'typeorm';
 import { Injectable, Inject } from '@nestjs/common';
-import type { MiUser, MiLocalUser, MiRemoteUser } from '@/models/User.js';
+import type { MiUser, MiLocalUser, MiRemoteUser, MiPartialUser } from '@/models/User.js';
 import { MiNote, IMentionedRemoteUsers } from '@/models/Note.js';
 import type { InstancesRepository, MiMeta, NotesRepository, UsersRepository } from '@/models/_.js';
 import { RelayService } from '@/core/RelayService.js';
@@ -71,7 +71,7 @@ export class NoteDeleteService {
 	 * @param user 投稿者
 	 * @param note 投稿
 	 */
-	async delete(user: { id: MiUser['id']; uri: MiUser['uri']; host: MiUser['host']; isBot: MiUser['isBot']; }, note: MiNote, quiet = false, deleter?: MiUser) {
+	async delete(user: MiPartialUser & { isBot: MiUser['isBot']; }, note: MiNote, quiet = false, deleter?: MiUser) {
 		const deletedAt = new Date();
 		const cascadingNotes = await this.findCascadingNotes(note);
 
@@ -103,7 +103,7 @@ export class NoteDeleteService {
 				}
 
 				const content = this.apRendererService.addContext(renote
-					? this.apRendererService.renderUndo(this.apRendererService.renderAnnounce(renote.uri ?? `${this.config.url}/notes/${renote.id}`, note), user)
+					? this.apRendererService.renderUndo(this.apRendererService.renderAnnounce(renote.uri ?? `${this.config.url}/notes/${renote.id}`, note, user), user)
 					: this.apRendererService.renderDelete(this.apRendererService.renderTombstone(`${this.config.url}/notes/${note.id}`), user));
 
 				this.deliverToConcerned(user, note, content);

packages/backend/src/core/NoteEditService.ts

@@ -770,7 +770,7 @@ export class NoteEditService implements OnApplicationShutdown {
 		if (data.localOnly) return null;
 
 		const content = this.isRenote(data) && !this.isQuote(data)
-			? this.apRendererService.renderAnnounce(data.renote.uri ? data.renote.uri : `${this.config.url}/notes/${data.renote.id}`, note)
+			? this.apRendererService.renderAnnounce(data.renote.uri ? data.renote.uri : `${this.config.url}/notes/${data.renote.id}`, note, user)
 			: this.apRendererService.renderUpdate(await this.apRendererService.renderUpNote(note, user, false), user);
 
 		return this.apRendererService.addContext(content);

packages/backend/src/core/ReactionService.ts

@@ -7,7 +7,7 @@ import { Inject, Injectable } from '@nestjs/common';
 import { DI } from '@/di-symbols.js';
 import type { EmojisRepository, NoteReactionsRepository, UsersRepository, NotesRepository, NoteThreadMutingsRepository, MiMeta } from '@/models/_.js';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
-import type { MiRemoteUser, MiUser } from '@/models/User.js';
+import type { MiPartialUser, MiRemoteUser, MiUser } from '@/models/User.js';
 import type { MiNote } from '@/models/Note.js';
 import { IdService } from '@/core/IdService.js';
 import type { MiNoteReaction } from '@/models/NoteReaction.js';
@@ -106,7 +106,7 @@ export class ReactionService {
 	}
 
 	@bindThis
-	public async create(user: { id: MiUser['id']; host: MiUser['host']; isBot: MiUser['isBot'] }, note: MiNote, _reaction?: string | null) {
+	public async create(user: MiPartialUser & { isBot: MiUser['isBot'] }, note: MiNote, _reaction?: string | null) {
 		// Check blocking
 		if (note.userId !== user.id) {
 			const blocked = await this.userBlockingService.checkBlocked(note.userId, user.id);
@@ -276,7 +276,7 @@ export class ReactionService {
 
 		//#region 配信
 		if (this.userEntityService.isLocalUser(user) && !note.localOnly) {
-			const content = this.apRendererService.addContext(await this.apRendererService.renderLike(record, note));
+			const content = this.apRendererService.addContext(await this.apRendererService.renderLike(record, note, user));
 			const dm = this.apDeliverManagerService.createDeliverManager(user, content);
 			if (note.userHost !== null) {
 				const reactee = await this.usersRepository.findOneBy({ id: note.userId });
@@ -337,7 +337,7 @@ export class ReactionService {
 
 		//#region 配信
 		if (this.userEntityService.isLocalUser(user) && !note.localOnly) {
-			const content = this.apRendererService.addContext(this.apRendererService.renderUndo(await this.apRendererService.renderLike(exist, note), user));
+			const content = this.apRendererService.addContext(this.apRendererService.renderUndo(await this.apRendererService.renderLike(exist, note, user), user));
 			const dm = this.apDeliverManagerService.createDeliverManager(user, content);
 			if (note.userHost !== null) {
 				const reactee = await this.usersRepository.findOneBy({ id: note.userId });

packages/backend/src/core/RemoteUserResolveService.ts

@@ -40,12 +40,14 @@ export class RemoteUserResolveService {
 	}
 
 	@bindThis
-	public async resolveUser(username: string, host: string | null): Promise<MiLocalUser | MiRemoteUser> {
+	public async resolveUser(username: string, host: string | null, requestHostname?: string): Promise<MiLocalUser | MiRemoteUser> {
 		const usernameLower = username.toLowerCase();
+		const selfHost = requestHostname ? this.utilityService.getSelfQueryHost(requestHostname) : IsNull();
+		const tenant = requestHostname ? this.utilityService.getSelfTenant(requestHostname) : this.config;
 
 		if (host == null) {
 			this.logger.info(`return local user: ${usernameLower}`);
-			return await this.usersRepository.findOneBy({ usernameLower, host: IsNull() }).then(u => {
+			return await this.usersRepository.findOneBy({ usernameLower, host: selfHost }).then(u => {
 				if (u == null) {
 					throw new Error('user not found');
 				} else {
@@ -56,9 +58,9 @@ export class RemoteUserResolveService {
 
 		host = this.utilityService.toPuny(host);
 
-		if (host === this.utilityService.toPuny(this.config.host)) {
+		if (host === this.utilityService.toPuny(tenant.host)) {
 			this.logger.info(`return local user: ${usernameLower}`);
-			return await this.usersRepository.findOneBy({ usernameLower, host: IsNull() }).then(u => {
+			return await this.usersRepository.findOneBy({ usernameLower, host: selfHost }).then(u => {
 				if (u == null) {
 					throw new Error('user not found');
 				} else {

packages/backend/src/core/UserBlockingService.ts

@@ -73,7 +73,7 @@ export class UserBlockingService implements OnModuleInit {
 			blockerId: blocker.id,
 			blockee,
 			blockeeId: blockee.id,
-		} as MiBlocking;
+		} satisfies MiBlocking;
 
 		await this.blockingsRepository.insert(blocking);
 
@@ -178,7 +178,7 @@ export class UserBlockingService implements OnModuleInit {
 
 		// deliver if remote bloking
 		if (this.userEntityService.isLocalUser(blocker) && this.userEntityService.isRemoteUser(blockee)) {
-			const content = this.apRendererService.addContext(this.apRendererService.renderUndo(this.apRendererService.renderBlock(blocking), blocker));
+			const content = this.apRendererService.addContext(this.apRendererService.renderUndo(this.apRendererService.renderBlock(blocking as MiBlocking & { blocker: MiUser, blockee: MiUser }), blocker));
 			this.queueService.deliver(blocker, content, blockee.inbox, false);
 		}
 	}

packages/backend/src/core/UtilityService.ts

@@ -7,8 +7,9 @@ import { URL, domainToASCII } from 'node:url';
 import { Inject, Injectable } from '@nestjs/common';
 import RE2 from 're2';
 import psl from 'psl';
+import { IsNull } from 'typeorm';
 import { DI } from '@/di-symbols.js';
-import type { Config } from '@/config.js';
+import type { Config, Tenant } from '@/config.js';
 import { bindThis } from '@/decorators.js';
 import { MiMeta } from '@/models/Meta.js';
 
@@ -176,4 +177,23 @@ export class UtilityService {
 		const host = this.extractDbHost(uri);
 		return this.isFederationAllowedHost(host);
 	}
+
+	@bindThis
+	public getSelfQueryHost(requestHostname: string) {
+		return this.getSelfDbHost(requestHostname) ?? IsNull();
+	}
+
+	@bindThis
+	public getSelfDbHost(requestHostname: string): string | null {
+		if (this.config.alts.some(alt => alt.hostname === requestHostname)) {
+			return this.punyHost(requestHostname);
+		}
+
+		return null;
+	}
+
+	@bindThis
+	public getSelfTenant(requestHostname: string): Tenant {
+		return this.config.alts.find(alt => alt.hostname === requestHostname) ?? this.config;
+	}
 }

packages/backend/src/core/activitypub/ApDbResolverService.ts

@@ -68,6 +68,7 @@ export class ApDbResolverService implements OnApplicationShutdown {
 			return { local: false, uri: apId };
 		}
 
+		// TODO support alt-local
 		const [, type, id, ...rest] = uri.pathname.split(separator);
 		return {
 			local: true,

packages/backend/src/core/activitypub/ApRendererService.ts

@@ -10,7 +10,7 @@ import * as mfm from '@transfem-org/sfm-js';
 import { UnrecoverableError } from 'bullmq';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
-import type { MiPartialLocalUser, MiLocalUser, MiPartialRemoteUser, MiRemoteUser, MiUser } from '@/models/User.js';
+import type { MiPartialLocalUser, MiLocalUser, MiPartialRemoteUser, MiRemoteUser, MiUser, MiPartialUser } from '@/models/User.js';
 import type { IMentionedRemoteUsers, MiNote } from '@/models/Note.js';
 import type { MiBlocking } from '@/models/Blocking.js';
 import type { MiRelay } from '@/models/Relay.js';
@@ -34,7 +34,7 @@ import { UtilityService } from '@/core/UtilityService.js';
 import { JsonLdService } from './JsonLdService.js';
 import { ApMfmService } from './ApMfmService.js';
 import { CONTEXT } from './misc/contexts.js';
-import { getApId, IOrderedCollection, IOrderedCollectionPage } from './type.js';
+import { getApId, getNullableApId, IOrderedCollection, IOrderedCollectionPage } from './type.js';
 import type { IAccept, IActivity, IAdd, IAnnounce, IApDocument, IApEmoji, IApHashtag, IApImage, IApMention, IBlock, ICreate, IDelete, IFlag, IFollow, IKey, ILike, IMove, IObject, IPost, IQuestion, IReject, IRemove, ITombstone, IUndo, IUpdate } from './type.js';
 
 @Injectable()
@@ -78,27 +78,30 @@ export class ApRendererService {
 	}
 
 	@bindThis
-	public renderAccept(object: string | IObject, user: { id: MiUser['id']; host: null }): IAccept {
+	public renderAccept(object: string | IObject, user: MiPartialUser): IAccept {
 		return {
 			type: 'Accept',
-			actor: this.userEntityService.genLocalUserUri(user.id),
+			actor: this.userEntityService.getUserUri(user),
 			object,
 		};
 	}
 
 	@bindThis
-	public renderAdd(user: MiLocalUser, target: string | IObject | undefined, object: string | IObject): IAdd {
+	public renderAdd(user: MiPartialUser, target: string | IObject | undefined, object: string | IObject): IAdd {
 		return {
 			type: 'Add',
-			actor: this.userEntityService.genLocalUserUri(user.id),
+			actor: this.userEntityService.getUserUri(user),
 			target,
 			object,
 		};
 	}
 
+	public renderAnnounce(object: string | IObject, note: MiNote & { user: MiUser }): IAnnounce;
+	public renderAnnounce(object: string | IObject, note: MiNote, author: MiPartialUser): IAnnounce;
 	@bindThis
-	public renderAnnounce(object: string | IObject, note: MiNote): IAnnounce {
+	public renderAnnounce(object: string | IObject, note: MiNote, author?: MiPartialUser): IAnnounce {
-		const attributedTo = this.userEntityService.genLocalUserUri(note.userId);
+		const user = author ?? note.user as MiPartialUser;
+		const attributedTo = this.userEntityService.getUserUri(user);
 
 		let to: string[] = [];
 		let cc: string[] = [];
@@ -116,9 +119,13 @@ export class ApRendererService {
 			throw new UnrecoverableError(`renderAnnounce: cannot render non-public note: ${getApId(object)}`);
 		}
 
+		const id = note.uri
+			? `${note.uri}/activity`
+			: `${this.config.url}/notes/${note.id}/activity`;
+
 		return {
-			id: `${this.config.url}/notes/${note.id}/activity`,
+			id,
-			actor: this.userEntityService.genLocalUserUri(note.userId),
+			actor: attributedTo,
 			type: 'Announce',
 			published: this.idService.parse(note.id).date.toISOString(),
 			to,
@@ -130,27 +137,35 @@ export class ApRendererService {
 	/**
 	 * Renders a block into its ActivityPub representation.
 	 *
-	 * @param block The block to be rendered. The blockee relation must be loaded.
+	 * @param block The block to be rendered. The blockee and blocker relation must be loaded.
 	 */
 	@bindThis
-	public renderBlock(block: MiBlocking): IBlock {
+	public renderBlock(block: MiBlocking & { blockee: MiUser, blocker: MiUser }): IBlock {
-		if (block.blockee?.uri == null) {
+		const id = block.blocker.host
-			throw new Error('renderBlock: missing blockee uri');
+			? `https://${block.blocker.host}/blocks/${block.id}`
-		}
+			: `${this.config.url}/blocks/${block.id}`;
 
 		return {
 			type: 'Block',
-			id: `${this.config.url}/blocks/${block.id}`,
+			id,
-			actor: this.userEntityService.genLocalUserUri(block.blockerId),
+			actor: this.userEntityService.getUserUri(block.blocker),
-			object: block.blockee.uri,
+			object: this.userEntityService.getUserUri(block.blockee),
 		};
 	}
 
+	public renderCreate(object: IObject, note: MiNote & { user: MiUser }): ICreate;
+	public renderCreate(object: IObject, note: MiNote, author: MiPartialUser): ICreate;
 	@bindThis
-	public renderCreate(object: IObject, note: MiNote): ICreate {
+	public renderCreate(object: IObject, note: MiNote, author?: MiPartialUser): ICreate {
+		const id = note.uri
+			? `${note.uri}/activity`
+			: `${this.config.url}/notes/${note.id}/activity`;
+
+		const user = author ?? note.user as MiPartialUser;
+
 		const activity: ICreate = {
-			id: `${this.config.url}/notes/${note.id}/activity`,
+			id,
-			actor: this.userEntityService.genLocalUserUri(note.userId),
+			actor: this.userEntityService.getUserUri(user),
 			type: 'Create',
 			published: this.idService.parse(note.id).date.toISOString(),
 			object,
@@ -163,10 +178,10 @@ export class ApRendererService {
 	}
 
 	@bindThis
-	public renderDelete(object: IObject | string, user: { id: MiUser['id']; host: null }): IDelete {
+	public renderDelete(object: IObject | string, user: MiPartialUser): IDelete {
 		return {
 			type: 'Delete',
-			actor: this.userEntityService.genLocalUserUri(user.id),
+			actor: this.userEntityService.getUserUri(user),
 			object,
 			published: new Date().toISOString(),
 		};
@@ -187,7 +202,7 @@ export class ApRendererService {
 	@bindThis
 	public renderEmoji(emoji: MiEmoji): IApEmoji {
 		return {
-			id: `${this.config.url}/emojis/${emoji.name}`,
+			id: emoji.uri ?? `${this.config.url}/emojis/${emoji.name}`,
 			type: 'Emoji',
 			name: `:${emoji.name}:`,
 			updated: emoji.updatedAt != null ? emoji.updatedAt.toISOString() : new Date().toISOString(),
@@ -205,10 +220,10 @@ export class ApRendererService {
 
 	// to anonymise reporters, the reporting actor must be a system user
 	@bindThis
-	public renderFlag(user: MiLocalUser, object: IObject | string, content: string): IFlag {
+	public renderFlag(user: MiUser, object: IObject | string, content: string): IFlag {
 		return {
 			type: 'Flag',
-			actor: this.userEntityService.genLocalUserUri(user.id),
+			actor: this.userEntityService.getUserUri(user),
 			content,
 			// This MUST be an array for Pleroma compatibility: https://activitypub.software/TransFem-org/Sharkey/-/issues/641#note_7301
 			object: [object],
@@ -216,11 +231,15 @@ export class ApRendererService {
 	}
 
 	@bindThis
-	public renderFollowRelay(relay: MiRelay, relayActor: MiLocalUser): IFollow {
+	public renderFollowRelay(relay: MiRelay, relayActor: MiUser): IFollow {
+		const id = relayActor.host
+			? `https://${relayActor.host}/activities/follow-relay/${relay.id}`
+			: `${this.config.url}/activities/follow-relay/${relay.id}`;
+
 		return {
-			id: `${this.config.url}/activities/follow-relay/${relay.id}`,
+			id,
 			type: 'Follow',
-			actor: this.userEntityService.genLocalUserUri(relayActor.id),
+			actor: this.userEntityService.getUserUri(relayActor),
 			object: 'https://www.w3.org/ns/activitystreams#Public',
 		};
 	}
@@ -269,7 +288,7 @@ export class ApRendererService {
 	}
 
 	@bindThis
-	public renderIdenticon(user: MiLocalUser): IApImage {
+	public renderIdenticon(user: MiUser): IApImage {
 		return {
 			type: 'Image',
 			url: this.userEntityService.getIdenticonUrl(user),
@@ -279,7 +298,7 @@ export class ApRendererService {
 	}
 
 	@bindThis
-	public renderSystemAvatar(user: MiLocalUser): IApImage {
+	public renderSystemAvatar(user: MiUser): IApImage {
 		if (this.meta.iconUrl == null) return this.renderIdenticon(user);
 		return {
 			type: 'Image',
@@ -312,11 +331,15 @@ export class ApRendererService {
 	}
 
 	@bindThis
-	public renderKey(user: MiLocalUser, key: MiUserKeypair, postfix?: string): IKey {
+	public renderKey(user: MiUser, key: MiUserKeypair, postfix?: string): IKey {
+		const id = user.uri
+			? `${user.uri}${postfix ?? '/publickey'}`
+			: `${this.config.url}/users/${user.id}${postfix ?? '/publickey'}`;
+
 		return {
-			id: `${this.config.url}/users/${user.id}${postfix ?? '/publickey'}`,
+			id,
 			type: 'Key',
-			owner: this.userEntityService.genLocalUserUri(user.id),
+			owner: this.userEntityService.getUserUri(user),
 			publicKeyPem: createPublicKey(key.publicKey).export({
 				type: 'spki',
 				format: 'pem',
@@ -324,11 +347,15 @@ export class ApRendererService {
 		};
 	}
 
+	public async renderLike(noteReaction: MiNoteReaction & { user: MiUser }, note: { uri: string | null }): Promise<ILike>;
+	public async renderLike(noteReaction: MiNoteReaction, note: { uri: string | null }, reactUser: MiPartialUser): Promise<ILike>;
 	@bindThis
-	public async renderLike(noteReaction: MiNoteReaction, note: { uri: string | null }): Promise<ILike> {
+	public async renderLike(noteReaction: MiNoteReaction, note: { uri: string | null }, reactUser?: MiPartialUser): Promise<ILike> {
 		const reaction = noteReaction.reaction;
 		let isMastodon = false;
 
+		const user = reactUser ?? noteReaction.user as MiPartialUser;
+
 		if (this.meta.defaultLike && reaction.replaceAll(':', '') === this.meta.defaultLike.replaceAll(':', '')) {
 			const note = await this.notesRepository.findOneBy({ id: noteReaction.noteId });
 
@@ -342,10 +369,14 @@ export class ApRendererService {
 			}
 		}
 
+		const id = user.host
+			? `https://${user.host}/likes/${noteReaction.id}`
+			: `${this.config.url}/likes/${noteReaction.id}`;
+
 		const object: ILike = {
 			type: 'Like',
-			id: `${this.config.url}/likes/${noteReaction.id}`,
+			id,
-			actor: `${this.config.url}/users/${noteReaction.userId}`,
+			actor: user.uri ?? `${this.config.url}/users/${noteReaction.userId}`,
 			object: note.uri ? note.uri : `${this.config.url}/notes/${noteReaction.noteId}`,
 			content: isMastodon ? undefined : reaction,
 			_misskey_reaction: isMastodon ? undefined : reaction,
@@ -365,7 +396,7 @@ export class ApRendererService {
 	public renderMention(mention: MiPartialLocalUser | MiPartialRemoteUser): IApMention {
 		return {
 			type: 'Mention',
-			href: this.userEntityService.getUserUri(mention),
+			href: mention.uri ?? this.userEntityService.getUserUri(mention),
 			name: this.userEntityService.isRemoteUser(mention) ? `@${mention.username}@${mention.host}` : `@${(mention as MiLocalUser).username}`,
 		};
 	}
@@ -377,8 +408,13 @@ export class ApRendererService {
 	): IMove {
 		const actor = this.userEntityService.getUserUri(src);
 		const target = this.userEntityService.getUserUri(dst);
+
+		const id = src.host
+			? `https://${src.host}/moves/${src.id}/${dst.id}`
+			: `${this.config.url}/moves/${src.id}/${dst.id}`;
+
 		return {
-			id: `${this.config.url}/moves/${src.id}/${dst.id}`,
+			id,
 			actor,
 			type: 'Move',
 			object: actor,
@@ -429,7 +465,7 @@ export class ApRendererService {
 			}
 		}
 
-		const attributedTo = this.userEntityService.genLocalUserUri(note.userId);
+		const attributedTo = this.userEntityService.getUserUri(author);
 
 		const mentions = note.mentionedRemoteUsers ? (JSON.parse(note.mentionedRemoteUsers) as IMentionedRemoteUsers).map(x => x.uri) : [];
 
@@ -524,7 +560,7 @@ export class ApRendererService {
 		const replies = isPublic ? await this.renderRepliesCollection(note.id) : undefined;
 
 		return {
-			id: `${this.config.url}/notes/${note.id}`,
+			id: note.uri ?? `${this.config.url}/notes/${note.id}`,
 			type: 'Note',
 			attributedTo,
 			summary: summary ?? undefined,
@@ -551,8 +587,8 @@ export class ApRendererService {
 
 	// if you change this, also change `server/api/endpoints/i/update.ts`
 	@bindThis
-	public async renderPerson(user: MiLocalUser) {
+	public async renderPerson(user: MiUser) {
-		const id = this.userEntityService.genLocalUserUri(user.id);
+		const id = this.userEntityService.getUserUri(user);
 		const isSystem = user.username.includes('.');
 
 		const [avatar, banner, background, profile] = await Promise.all([
@@ -583,14 +619,14 @@ export class ApRendererService {
 		const person: any = {
 			type: isSystem ? 'Application' : user.isBot ? 'Service' : 'Person',
 			id,
-			inbox: `${id}/inbox`,
+			inbox: user.inbox ?? user.uri ? `${user.uri}/inbox` : `${id}/inbox`,
-			outbox: `${id}/outbox`,
+			outbox: user.uri ? `${user.uri}/followers` : `${id}/outbox`,
-			followers: `${id}/followers`,
+			followers: user.followersUri ?? user.uri ? `${user.uri}/followers` : `${id}/followers`,
-			following: `${id}/following`,
+			following: user.uri ? `${user.uri}/following` : `${id}/following`,
-			featured: `${id}/collections/featured`,
+			featured: user.featured ?? user.uri ? `${user.uri}/features` : `${id}/collections/featured`,
-			sharedInbox: `${this.config.url}/inbox`,
+			sharedInbox: user.sharedInbox ?? user.host ? `${user.host}/inbox` : `${this.config.url}/inbox`,
-			endpoints: { sharedInbox: `${this.config.url}/inbox` },
+			endpoints: { sharedInbox: user.sharedInbox ?? user.host ? `${user.host}/inbox` : `${this.config.url}/inbox` },
-			url: `${this.config.url}/@${user.username}`,
+			url: profile.url ?? user.uri ?? `${this.config.url}/@${user.username}`,
 			preferredUsername: user.username,
 			name: user.name,
 			summary: profile.description ? this.mfmService.toHtml(mfm.parse(profile.description)) : null,
@@ -639,21 +675,22 @@ export class ApRendererService {
 	}
 
 	@bindThis
-	public async renderPersonRedacted(user: MiLocalUser) {
+	public async renderPersonRedacted(user: MiUser) {
-		const id = this.userEntityService.genLocalUserUri(user.id);
+		const id = this.userEntityService.getUserUri(user);
 		const isSystem = user.username.includes('.');
 
 		const keypair = await this.userKeypairService.getUserKeypair(user.id);
+		const profile = await this.userProfilesRepository.findOneByOrFail({ userId: user.id });
 
 		return {
 			// Basic federation metadata
 			type: isSystem ? 'Application' : user.isBot ? 'Service' : 'Person',
 			id,
-			inbox: `${id}/inbox`,
+			inbox: user.inbox ?? user.uri ? `${user.uri}/inbox` : `${id}/inbox`,
-			outbox: `${id}/outbox`,
+			outbox: user.uri ? `${user.uri}/followers` : `${id}/outbox`,
-			sharedInbox: `${this.config.url}/inbox`,
+			sharedInbox: user.sharedInbox ?? user.host ? `${user.host}/inbox` : `${this.config.url}/inbox`,
-			endpoints: { sharedInbox: `${this.config.url}/inbox` },
+			endpoints: { sharedInbox: user.sharedInbox ?? user.host ? `${user.host}/inbox` : `${this.config.url}/inbox` },
-			url: `${this.config.url}/@${user.username}`,
+			url: profile.url ?? user.uri ?? `${this.config.url}/@${user.username}`,
 			preferredUsername: user.username,
 			publicKey: this.renderKey(user, keypair, '#main-key'),
 
@@ -671,11 +708,11 @@ export class ApRendererService {
 	}
 
 	@bindThis
-	public renderQuestion(user: { id: MiUser['id'] }, note: MiNote, poll: MiPoll): IQuestion {
+	public renderQuestion(user: MiPartialUser, note: MiNote, poll: MiPoll): IQuestion {
 		return {
 			type: 'Question',
-			id: `${this.config.url}/questions/${note.id}`,
+			id: note.uri ?? `${this.config.url}/questions/${note.id}`,
-			actor: this.userEntityService.genLocalUserUri(user.id),
+			actor: this.userEntityService.getUserUri(user),
 			content: note.text ?? '',
 			[poll.multiple ? 'anyOf' : 'oneOf']: poll.choices.map((text, i) => ({
 				name: text,
@@ -689,19 +726,19 @@ export class ApRendererService {
 	}
 
 	@bindThis
-	public renderReject(object: string | IObject, user: { id: MiUser['id'] }): IReject {
+	public renderReject(object: string | IObject, user: MiPartialUser): IReject {
 		return {
 			type: 'Reject',
-			actor: this.userEntityService.genLocalUserUri(user.id),
+			actor: this.userEntityService.getUserUri(user),
 			object,
 		};
 	}
 
 	@bindThis
-	public renderRemove(user: { id: MiUser['id'] }, target: string | IObject | undefined, object: string | IObject): IRemove {
+	public renderRemove(user: MiPartialUser, target: string | IObject | undefined, object: string | IObject): IRemove {
 		return {
 			type: 'Remove',
-			actor: this.userEntityService.genLocalUserUri(user.id),
+			actor: this.userEntityService.getUserUri(user),
 			target,
 			object,
 		};
@@ -716,23 +753,30 @@ export class ApRendererService {
 	}
 
 	@bindThis
-	public renderUndo(object: string | IObject, user: { id: MiUser['id'] }): IUndo {
+	public renderUndo(object: string | IObject, user: MiPartialUser): IUndo {
-		const id = typeof object !== 'string' && typeof object.id === 'string' && this.utilityService.isUriLocal(object.id) ? `${object.id}/undo` : undefined;
+		const objectId = getNullableApId(object);
+		const id = objectId
+			? `${objectId}/undo`
+			: undefined;
 
 		return {
 			type: 'Undo',
-			...(id ? { id } : {}),
+			id,
-			actor: this.userEntityService.genLocalUserUri(user.id),
+			actor: this.userEntityService.getUserUri(user),
 			object,
 			published: new Date().toISOString(),
 		};
 	}
 
 	@bindThis
-	public renderUpdate(object: string | IObject, user: { id: MiUser['id'] }): IUpdate {
+	public renderUpdate(object: string | IObject, user: MiPartialUser): IUpdate {
+		const id = user.uri
+			? `${user.uri}#updates/${new Date().getTime()}`
+			: `${this.config.url}/users/${user.id}#updates/${new Date().getTime()}`;
+
 		return {
-			id: `${this.config.url}/users/${user.id}#updates/${new Date().getTime()}`,
+			id,
-			actor: this.userEntityService.genLocalUserUri(user.id),
+			actor: this.userEntityService.getUserUri(user),
 			type: 'Update',
 			to: ['https://www.w3.org/ns/activitystreams#Public'],
 			object,
@@ -783,7 +827,7 @@ export class ApRendererService {
 			}
 		}
 
-		const attributedTo = this.userEntityService.genLocalUserUri(note.userId);
+		const attributedTo = this.userEntityService.getUserUri(author);
 
 		const mentions = note.mentionedRemoteUsers ? (JSON.parse(note.mentionedRemoteUsers) as IMentionedRemoteUsers).map(x => x.uri) : [];
 
@@ -871,7 +915,7 @@ export class ApRendererService {
 		} as const : {};
 
 		return {
-			id: `${this.config.url}/notes/${note.id}`,
+			id: note.uri ?? `${this.config.url}/notes/${note.id}`,
 			type: 'Note',
 			attributedTo,
 			summary: summary ?? undefined,
@@ -897,17 +941,24 @@ export class ApRendererService {
 	}
 
 	@bindThis
-	public renderVote(user: { id: MiUser['id'] }, vote: MiPollVote, note: MiNote, poll: MiPoll, pollOwner: MiRemoteUser): ICreate {
+	public renderVote(user: MiPartialUser, vote: MiPollVote, note: MiNote, poll: MiPoll, pollOwner: MiRemoteUser): ICreate {
+		const voteId = user.uri
+			? `${user.uri}#votes/${vote.id}`
+			: `${this.config.url}/users/${user.id}#votes/${vote.id}`;
+
+		const activityId = `${voteId}/activity`;
+
 		return {
-			id: `${this.config.url}/users/${user.id}#votes/${vote.id}/activity`,
+			id: activityId,
-			actor: this.userEntityService.genLocalUserUri(user.id),
+			actor: this.userEntityService.getUserUri(user),
 			type: 'Create',
 			to: [pollOwner.uri],
 			published: new Date().toISOString(),
 			object: {
-				id: `${this.config.url}/users/${user.id}#votes/${vote.id}`,
+				id: voteId,
 				type: 'Note',
-				attributedTo: this.userEntityService.genLocalUserUri(user.id),
+				attributedTo: this.userEntityService.getUserUri(user),
+				// TODO what about local poll?
 				to: [pollOwner.uri],
 				inReplyTo: note.uri,
 				name: poll.choices[vote.choice],
@@ -925,7 +976,7 @@ export class ApRendererService {
 	}
 
 	@bindThis
-	public async attachLdSignature(activity: any, user: { id: MiUser['id']; host: null; }): Promise<IActivity> {
+	public async attachLdSignature(activity: any, user: MiPartialUser): Promise<IActivity> {
 		// Linked Data signatures are cryptographic signatures attached to each activity to provide proof of authenticity.
 		// When using authorized fetch, this is often undesired as any signed activity can be forwarded to a blocked instance by relays and other instances.
 		// This setting allows admins to disable LD signatures for increased privacy, at the expense of fewer relayed activities and additional inbound fetch (GET) requests.
@@ -933,11 +984,15 @@ export class ApRendererService {
 			return activity;
 		}
 
+		const keyId = user.uri
+			? `${user.uri}#main-key`
+			: `${this.config.url}/users/${user.id}#main-key`;
+
 		const keypair = await this.userKeypairService.getUserKeypair(user.id);
 
 		const jsonLd = this.jsonLdService.use();
 		jsonLd.debug = false;
-		activity = await jsonLd.signRsaSignature2017(activity, keypair.privateKey, `${this.config.url}/users/${user.id}#main-key`);
+		activity = await jsonLd.signRsaSignature2017(activity, keypair.privateKey, keyId);
 
 		return activity;
 	}

packages/backend/src/core/activitypub/ApResolverService.ts

@@ -5,8 +5,8 @@
 
 import { Inject, Injectable } from '@nestjs/common';
 import { IsNull, Not } from 'typeorm';
-import type { MiLocalUser, MiRemoteUser } from '@/models/User.js';
+import type { MiLocalUser, MiPartialUser, MiRemoteUser, MiUser } from '@/models/User.js';
-import type { NotesRepository, PollsRepository, NoteReactionsRepository, UsersRepository, FollowRequestsRepository, MiMeta, SkApFetchLog } from '@/models/_.js';
+import type { NotesRepository, PollsRepository, NoteReactionsRepository, UsersRepository, FollowRequestsRepository, MiMeta, SkApFetchLog, MiNoteReaction } from '@/models/_.js';
 import type { Config } from '@/config.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
 import { DI } from '@/di-symbols.js';
@@ -238,7 +238,7 @@ export class Resolver {
 						const author = await this.usersRepository.findOneByOrFail({ id: note.userId });
 						if (parsed.rest === 'activity') {
 							// this refers to the create activity and not the note itself
-							return this.apRendererService.addContext(this.apRendererService.renderCreate(await this.apRendererService.renderNote(note, author), note));
+							return this.apRendererService.addContext(this.apRendererService.renderCreate(await this.apRendererService.renderNote(note, author), note, author));
 						} else {
 							return this.apRendererService.renderNote(note, author);
 						}
@@ -249,13 +249,13 @@ export class Resolver {
 			case 'questions':
 				// Polls are indexed by the note they are attached to.
 				return Promise.all([
-					this.notesRepository.findOneByOrFail({ id: parsed.id }),
+					this.notesRepository.findOneOrFail({ where: { id: parsed.id }, relations: ['user'] }),
 					this.pollsRepository.findOneByOrFail({ noteId: parsed.id }),
 				])
-					.then(([note, poll]) => this.apRendererService.renderQuestion({ id: note.userId }, note, poll)) as Promise<IObjectWithId>;
+					.then(([note, poll]) => this.apRendererService.renderQuestion(note.user as MiPartialUser, note, poll)) as Promise<IObjectWithId>;
 			case 'likes':
-				return this.noteReactionsRepository.findOneByOrFail({ id: parsed.id }).then(async reaction =>
+				return this.noteReactionsRepository.findOneOrFail({ where: { id: parsed.id }, relations: ['user'] }).then(async reaction =>
-					this.apRendererService.addContext(await this.apRendererService.renderLike(reaction, { uri: null })));
+					this.apRendererService.addContext(await this.apRendererService.renderLike(reaction as MiNoteReaction & { user: MiUser }, { uri: null })));
 			case 'follows':
 				return this.followRequestsRepository.findOneBy({ id: parsed.id })
 					.then(async followRequest => {

packages/backend/src/core/entities/MetaEntityService.ts

@@ -14,6 +14,7 @@ import { SystemAccountService } from '@/core/SystemAccountService.js';
 import type { Config } from '@/config.js';
 import { DI } from '@/di-symbols.js';
 import { DEFAULT_POLICIES } from '@/core/RoleService.js';
+import { UtilityService } from '@/core/UtilityService.js';
 
 @Injectable()
 export class MetaEntityService {
@@ -28,10 +29,11 @@ export class MetaEntityService {
 		private adsRepository: AdsRepository,
 
 		private systemAccountService: SystemAccountService,
+		private readonly utilityService: UtilityService,
 	) { }
 
 	@bindThis
-	public async pack(meta?: MiMeta): Promise<Packed<'MetaLite'>> {
+	public async pack(meta?: MiMeta, requestHostname?: string): Promise<Packed<'MetaLite'>> {
 		let instance = meta;
 
 		if (!instance) {
@@ -64,6 +66,8 @@ export class MetaEntityService {
 			}
 		}
 
+		const tenant = requestHostname ? this.utilityService.getSelfTenant(requestHostname) : this.config;
+
 		const packed: Packed<'MetaLite'> = {
 			maintainerName: instance.maintainerName,
 			maintainerEmail: instance.maintainerEmail,
@@ -73,7 +77,7 @@ export class MetaEntityService {
 
 			name: instance.name,
 			shortName: instance.shortName,
-			uri: this.config.url,
+			uri: tenant.url,
 			description: instance.description,
 			langs: instance.langs,
 			tosUrl: instance.termsOfServiceUrl,
@@ -151,14 +155,14 @@ export class MetaEntityService {
 	}
 
 	@bindThis
-	public async packDetailed(meta?: MiMeta): Promise<Packed<'MetaDetailed'>> {
+	public async packDetailed(meta?: MiMeta, requestHostname?: string): Promise<Packed<'MetaDetailed'>> {
 		let instance = meta;
 
 		if (!instance) {
 			instance = this.meta;
 		}
 
-		const packed = await this.pack(instance);
+		const packed = await this.pack(instance, requestHostname);
 
 		const proxyAccount = await this.systemAccountService.fetch('proxy');
 
@@ -181,6 +185,10 @@ export class MetaEntityService {
 				miauth: true,
 			},
 			allowUnsignedFetch: instance.allowUnsignedFetch,
+			localHosts: [
+				null,
+				...this.config.alts.map(alt => this.utilityService.toPuny(alt.host)),
+			],
 		};
 
 		return packDetailed;

packages/backend/src/core/entities/UserEntityService.ts

@@ -14,7 +14,7 @@ import type { Packed } from '@/misc/json-schema.js';
 import type { Promiseable } from '@/misc/prelude/await-all.js';
 import { awaitAll } from '@/misc/prelude/await-all.js';
 import { USER_ACTIVE_THRESHOLD, USER_ONLINE_THRESHOLD } from '@/const.js';
-import type { MiLocalUser, MiPartialLocalUser, MiPartialRemoteUser, MiRemoteUser, MiUser } from '@/models/User.js';
+import type { MiLocalUser, MiPartialLocalUser, MiPartialRemoteUser, MiPartialUser, MiRemoteUser, MiUser } from '@/models/User.js';
 import {
 	birthdaySchema,
 	descriptionSchema,
@@ -460,9 +460,8 @@ export class UserEntityService implements OnModuleInit {
 	}
 
 	@bindThis
-	public getUserUri(user: MiLocalUser | MiPartialLocalUser | MiRemoteUser | MiPartialRemoteUser): string {
+	public getUserUri(user: MiLocalUser | MiPartialLocalUser | MiRemoteUser | MiPartialRemoteUser | MiPartialUser | MiUser): string {
-		return this.isRemoteUser(user)
+		return user.uri ?? this.genLocalUserUri(user.id);
-			? user.uri : this.genLocalUserUri(user.id);
 	}
 
 	@bindThis

packages/backend/src/models/User.ts

@@ -407,6 +407,12 @@ export type MiPartialRemoteUser = Partial<MiUser> & {
 	uri: string;
 };
 
+export interface MiPartialUser extends Partial<MiUser> {
+	id: MiUser['id'];
+	host: MiUser['host'];
+	uri?: MiUser['uri'];
+}
+
 export const localUsernameSchema = { type: 'string', pattern: /^\w{1,20}$/.toString().slice(1, -1) } as const;
 export const passwordSchema = { type: 'string', minLength: 1 } as const;
 export const nameSchema = { type: 'string', minLength: 1, maxLength: 50 } as const;

packages/backend/src/models/json-schema/meta.ts

@@ -436,6 +436,14 @@ export const packedMetaDetailedOnlySchema = {
 			enum: instanceUnsignedFetchOptions,
 			optional: false, nullable: false,
 		},
+		localHosts: {
+			type: 'array',
+			optional: false, nullable: false,
+			items: {
+				type: 'string',
+				optional: false, nullable: true,
+			},
+		},
 	},
 } as const;
 

packages/backend/src/server/ActivityPubServerService.ts

@@ -14,7 +14,7 @@ import accepts from 'accepts';
 import vary from 'vary';
 import secureJson from 'secure-json-parse';
 import { DI } from '@/di-symbols.js';
-import type { FollowingsRepository, NotesRepository, EmojisRepository, NoteReactionsRepository, UserProfilesRepository, UserNotePiningsRepository, UsersRepository, FollowRequestsRepository, MiMeta } from '@/models/_.js';
+import type { FollowingsRepository, NotesRepository, EmojisRepository, NoteReactionsRepository, UserProfilesRepository, UserNotePiningsRepository, UsersRepository, FollowRequestsRepository, MiMeta, MiNoteReaction } from '@/models/_.js';
 import * as url from '@/misc/prelude/url.js';
 import type { Config } from '@/config.js';
 import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
@@ -114,10 +114,10 @@ export class ActivityPubServerService {
 	private async packActivity(note: MiNote, author: MiUser): Promise<ICreate | IAnnounce> {
 		if (isRenote(note) && !isQuote(note)) {
 			const renote = await this.notesRepository.findOneByOrFail({ id: note.renoteId });
-			return this.apRendererService.renderAnnounce(renote.uri ? renote.uri : `${this.config.url}/notes/${renote.id}`, note);
+			return this.apRendererService.renderAnnounce(renote.uri ? renote.uri : `${this.config.url}/notes/${renote.id}`, note, author);
 		}
 
-		return this.apRendererService.renderCreate(await this.apRendererService.renderNote(note, author, false), note);
+		return this.apRendererService.renderCreate(await this.apRendererService.renderNote(note, author, false), note, author);
 	}
 
 	/**
@@ -140,7 +140,7 @@ export class ActivityPubServerService {
 		}
 
 		// Auth fetch disabled => accept
-		const allowUnsignedFetch = await this.getUnsignedFetchAllowance(userId);
+		const allowUnsignedFetch = await this.getUnsignedFetchAllowance(userId, request.hostname);
 		if (allowUnsignedFetch === 'always') {
 			return { reject: false, redact: false };
 		}
@@ -186,7 +186,7 @@ export class ActivityPubServerService {
 				headers: ['(request-target)', 'host', 'date'],
 				authorizationHeaderName: 'signature',
 			});
-		} catch (e) {
+		} catch {
 			// not signed, or malformed signature: refuse
 			return `${request.id} ${request.url} not signed, or malformed signature: refuse`;
 		}
@@ -196,9 +196,12 @@ export class ActivityPubServerService {
 
 		const logPrefix = `${request.id} ${request.url} (by ${request.headers['user-agent']}) claims to be from ${keyHost}:`;
 
-		if (signature.params.headers.indexOf('host') === -1 || request.headers.host !== this.config.host) {
+		if (signature.params.headers.indexOf('host') === -1) {
-			// no destination host, or not us: refuse
+			return `${logPrefix} no destination host: refuse`;
-			return `${logPrefix} no destination host, or not us: refuse`;
+		}
+
+		if (request.hostname !== this.config.host && !this.config.alts.some(alt => alt.hostname === request.hostname)) {
+			return `${logPrefix} destination not us: refuse`;
 		}
 
 		if (!this.utilityService.isFederationAllowedHost(keyHost)) {
@@ -291,9 +294,14 @@ export class ActivityPubServerService {
 			return;
 		}
 
-		if (signature.params.headers.indexOf('host') === -1
+		if (signature.params.headers.indexOf('host') === -1) {
-			|| request.headers.host !== this.config.host) {
+			// no destination host: refuse
-			// Host not specified or not match.
+			reply.code(401);
+			return;
+		}
+
+		if (request.hostname !== this.config.host && !this.config.alts.some(alt => alt.hostname === request.hostname)) {
+			// destination not us: refuse
 			reply.code(401);
 			return;
 		}
@@ -373,7 +381,7 @@ export class ActivityPubServerService {
 
 		const user = await this.usersRepository.findOneBy({
 			id: userId,
-			host: IsNull(),
+			host: this.utilityService.getSelfQueryHost(request.hostname),
 		});
 
 		if (user == null) {
@@ -470,7 +478,7 @@ export class ActivityPubServerService {
 
 		const user = await this.usersRepository.findOneBy({
 			id: userId,
-			host: IsNull(),
+			host: this.utilityService.getSelfQueryHost(request.hostname),
 		});
 
 		if (user == null) {
@@ -556,7 +564,7 @@ export class ActivityPubServerService {
 
 		const user = await this.usersRepository.findOneBy({
 			id: userId,
-			host: IsNull(),
+			host: this.utilityService.getSelfQueryHost(request.hostname),
 		});
 
 		if (user == null) {
@@ -626,7 +634,7 @@ export class ActivityPubServerService {
 
 		const user = await this.usersRepository.findOneBy({
 			id: userId,
-			host: IsNull(),
+			host: this.utilityService.getSelfQueryHost(request.hostname),
 		});
 
 		if (user == null) {
@@ -723,7 +731,7 @@ export class ActivityPubServerService {
 		}
 
 		// リモートだったらリダイレクト
-		if (user.host != null) {
+		if (user.host !== this.utilityService.getSelfDbHost(request.hostname)) {
 			if (user.uri == null || this.utilityService.isSelfHost(user.host)) {
 				reply.code(500);
 				return;
@@ -735,7 +743,7 @@ export class ActivityPubServerService {
 		this.setResponseType(request, reply);
 
 		const person = redact
-			? await this.apRendererService.renderPersonRedacted(user as MiLocalUser)
+			? await this.apRendererService.renderPersonRedacted(user)
 			: await this.apRendererService.renderPerson(user as MiLocalUser);
 		return this.apRendererService.addContext(person);
 	}
@@ -829,7 +837,7 @@ export class ActivityPubServerService {
 			}
 
 			// リモートだったらリダイレクト
-			if (note.userHost != null) {
+			if (note.userHost !== this.utilityService.getSelfDbHost(request.hostname)) {
 				if (note.uri == null || this.utilityService.isSelfHost(note.userHost)) {
 					reply.code(500);
 					return;
@@ -855,7 +863,7 @@ export class ActivityPubServerService {
 
 			const note = await this.notesRepository.findOneBy({
 				id: request.params.note,
-				userHost: IsNull(),
+				userHost: this.utilityService.getSelfQueryHost(request.hostname),
 				visibility: In(['public', 'home']),
 				localOnly: false,
 			});
@@ -887,7 +895,7 @@ export class ActivityPubServerService {
 				.createQueryBuilder('note')
 				.andWhere({
 					id: request.params.note,
-					userHost: IsNull(),
+					userHost: this.utilityService.getSelfQueryHost(request.hostname),
 					visibility: In(['public', 'home']),
 					localOnly: false,
 				})
@@ -955,7 +963,7 @@ export class ActivityPubServerService {
 
 			const user = await this.usersRepository.findOneBy({
 				id: userId,
-				host: IsNull(),
+				host: this.utilityService.getSelfQueryHost(request.hostname),
 			});
 
 			if (user == null) {
@@ -1007,7 +1015,7 @@ export class ActivityPubServerService {
 
 			const user = await this.usersRepository.findOneBy({
 				usernameLower: acct.username.toLowerCase(),
-				host: acct.host ?? IsNull(),
+				host: acct.host ?? this.utilityService.getSelfQueryHost(request.hostname),
 				isSuspended: false,
 			});
 
@@ -1029,7 +1037,7 @@ export class ActivityPubServerService {
 			if (reject) return;
 
 			const emoji = await this.emojisRepository.findOneBy({
-				host: IsNull(),
+				host: this.utilityService.getSelfQueryHost(request.hostname),
 				name: request.params.emoji,
 			});
 
@@ -1039,7 +1047,7 @@ export class ActivityPubServerService {
 			}
 
 			this.setResponseType(request, reply);
-			return (this.apRendererService.addContext(await this.apRendererService.renderEmoji(emoji)));
+			return (this.apRendererService.addContext(this.apRendererService.renderEmoji(emoji)));
 		});
 
 		// like
@@ -1049,7 +1057,7 @@ export class ActivityPubServerService {
 				return;
 			}
 
-			const reaction = await this.noteReactionsRepository.findOneBy({ id: request.params.like });
+			const reaction = await this.noteReactionsRepository.findOne({ where: { id: request.params.like }, relations: ['user'] }) as MiNoteReaction & { user: MiUser } | null;
 
 			const { reject } = await this.checkAuthorizedFetch(request, reply, reaction?.userId);
 			if (reject) return;
@@ -1059,6 +1067,11 @@ export class ActivityPubServerService {
 				return;
 			}
 
+			if (reaction.user.host !== this.utilityService.getSelfDbHost(request.hostname)) {
+				reply.code(404);
+				return;
+			}
+
 			const note = await this.notesRepository.findOneBy({ id: reaction.noteId });
 
 			if (note == null) {
@@ -1083,14 +1096,15 @@ export class ActivityPubServerService {
 			// This may be used before the follow is completed, so we do not
 			// check if the following exists.
 
+			const queryHost = this.utilityService.getSelfQueryHost(request.hostname);
 			const [follower, followee] = await Promise.all([
 				this.usersRepository.findOneBy({
 					id: request.params.follower,
-					host: IsNull(),
+					host: queryHost,
 				}),
 				this.usersRepository.findOneBy({
 					id: request.params.followee,
-					host: Not(IsNull()),
+					host: Not(queryHost),
 				}),
 			]) as [MiLocalUser | MiRemoteUser | null, MiLocalUser | MiRemoteUser | null];
 
@@ -1125,14 +1139,15 @@ export class ActivityPubServerService {
 				return;
 			}
 
+			const queryHost = this.utilityService.getSelfQueryHost(request.hostname);
 			const [follower, followee] = await Promise.all([
 				this.usersRepository.findOneBy({
 					id: followRequest.followerId,
-					host: IsNull(),
+					host: queryHost,
 				}),
 				this.usersRepository.findOneBy({
 					id: followRequest.followeeId,
-					host: Not(IsNull()),
+					host: Not(queryHost),
 				}),
 			]) as [MiLocalUser | MiRemoteUser | null, MiLocalUser | MiRemoteUser | null];
 
@@ -1148,11 +1163,15 @@ export class ActivityPubServerService {
 		done();
 	}
 
-	private async getUnsignedFetchAllowance(userId: string | undefined) {
+	private async getUnsignedFetchAllowance(userId: string | undefined, hostname: string) {
-		const user = userId ? await this.cacheService.findLocalUserById(userId) : null;
+		let user = userId ? await this.cacheService.findUserById(userId) : null;
 
-		// User system value if there is no user, or if user has deferred the choice.
+		if (user && user.host !== this.utilityService.getSelfDbHost(hostname)) {
-		if (!user?.allowUnsignedFetch || user.allowUnsignedFetch === 'staff') {
+			user = null;
+		}
+
+		// Use system value if there is no user, or if user has deferred the choice.
+		if (!user || user.allowUnsignedFetch === 'staff') {
 			return this.meta.allowUnsignedFetch;
 		}
 

packages/backend/src/server/WellKnownServerService.ts

@@ -15,6 +15,7 @@ import type { MiUser } from '@/models/User.js';
 import * as Acct from '@/misc/acct.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { bindThis } from '@/decorators.js';
+import { UtilityService } from '@/core/UtilityService.js';
 import { NodeinfoServerService } from './NodeinfoServerService.js';
 import { OAuth2ProviderService } from './oauth/OAuth2ProviderService.js';
 import type { FindOptionsWhere } from 'typeorm';
@@ -35,6 +36,7 @@ export class WellKnownServerService {
 		private nodeinfoServerService: NodeinfoServerService,
 		private userEntityService: UserEntityService,
 		private oauth2ProviderService: OAuth2ProviderService,
+		private readonly utilityService: UtilityService,
 	) {
 		//this.createServer = this.createServer.bind(this);
 	}
@@ -74,11 +76,13 @@ export class WellKnownServerService {
 				return;
 			}
 
+			const tenant = this.utilityService.getSelfTenant(request.hostname);
+
 			reply.header('Content-Type', xrd);
 			return XRD({ element: 'Link', attributes: {
 				rel: 'lrdd',
 				type: xrd,
-				template: `${this.config.url}${webFingerPath}?resource={uri}`,
+				template: `${tenant.url}${webFingerPath}?resource={uri}`,
 			} });
 		});
 
@@ -88,12 +92,14 @@ export class WellKnownServerService {
 				return;
 			}
 
+			const tenant = this.utilityService.getSelfTenant(request.hostname);
+
 			reply.header('Content-Type', 'application/json');
 			return {
 				links: [{
 					rel: 'lrdd',
 					type: jrd,
-					template: `${this.config.url}${webFingerPath}?resource={uri}`,
+					template: `${tenant.url}${webFingerPath}?resource={uri}`,
 				}],
 			};
 		});
@@ -122,24 +128,27 @@ fastify.get('/.well-known/change-password', async (request, reply) => {
 				return;
 			}
 
+			const tenant = this.utilityService.getSelfTenant(request.hostname);
+			const queryHost = this.utilityService.getSelfQueryHost(request.hostname);
+
 			const fromId = (id: MiUser['id']): FindOptionsWhere<MiUser> => ({
 				id,
-				host: IsNull(),
+				host: queryHost,
 				isSuspended: false,
 			});
 
 			const generateQuery = (resource: string): FindOptionsWhere<MiUser> | number =>
-				resource.startsWith(`${this.config.url.toLowerCase()}/users/`) ?
+				resource.startsWith(`${tenant.url.toLowerCase()}/users/`) ?
 					fromId(resource.split('/').pop()!) :
 					fromAcct(Acct.parse(
-						resource.startsWith(`${this.config.url.toLowerCase()}/@`) ? resource.split('/').pop()! :
+						resource.startsWith(`${tenant.url.toLowerCase()}/@`) ? resource.split('/').pop()! :
 						resource.startsWith('acct:') ? resource.slice('acct:'.length) :
 						resource));
 
 			const fromAcct = (acct: Acct.Acct): FindOptionsWhere<MiUser> | number =>
-				!acct.host || acct.host === this.config.host.toLowerCase() ? {
+				!acct.host || acct.host === tenant.host.toLowerCase() ? {
 					usernameLower: acct.username.toLowerCase(),
-					host: IsNull(),
+					host: queryHost,
 					isSuspended: false,
 				} : 422;
 
@@ -162,12 +171,12 @@ fastify.get('/.well-known/change-password', async (request, reply) => {
 				return;
 			}
 
-			const subject = `acct:${user.username}@${this.config.host}`;
+			const subject = `acct:${user.username}@${tenant.host}`;
-			const profileLink = `${this.config.url}/@${user.username}`;
+			const profileLink = `${tenant.url}/@${user.username}`;
 			const self = {
 				rel: 'self',
 				type: 'application/activity+json',
-				href: this.userEntityService.genLocalUserUri(user.id),
+				href: this.userEntityService.getUserUri(user),
 			};
 			const profilePage = {
 				rel: 'http://webfinger.net/rel/profile-page',
@@ -176,7 +185,7 @@ fastify.get('/.well-known/change-password', async (request, reply) => {
 			};
 			const subscribe = {
 				rel: 'http://ostatus.org/schema/1.0/subscribe',
-				template: `${this.config.url}/authorize-follow?acct={uri}`,
+				template: `${tenant.url}/authorize-follow?acct={uri}`,
 			};
 
 			vary(reply.raw, 'Accept');

packages/backend/src/server/api/ApiCallService.ts

@@ -23,6 +23,7 @@ import { type RolePolicies, RoleService } from '@/core/RoleService.js';
 import type { Config } from '@/config.js';
 import { sendRateLimitHeaders } from '@/misc/rate-limit-utils.js';
 import { SkRateLimiterService } from '@/server/SkRateLimiterService.js';
+import type { PublicExecutor } from '@/server/api/endpoint-base.js';
 import { ApiError } from './error.js';
 import { ApiLoggerService } from './ApiLoggerService.js';
 import { AuthenticateService, AuthenticationError } from './AuthenticateService.js';
@@ -145,7 +146,7 @@ export class ApiCallService implements OnApplicationShutdown {
 
 	@bindThis
 	public handleRequest(
-		endpoint: IEndpoint & { exec: any },
+		endpoint: IEndpoint & { exec: PublicExecutor },
 		request: FastifyRequest<{ Body: Record<string, unknown> | undefined, Querystring: Record<string, unknown> }>,
 		reply: FastifyReply,
 	): void {
@@ -181,7 +182,7 @@ export class ApiCallService implements OnApplicationShutdown {
 
 	@bindThis
 	public async handleMultipartRequest(
-		endpoint: IEndpoint & { exec: any },
+		endpoint: IEndpoint & { exec: PublicExecutor },
 		request: FastifyRequest<{ Body: Record<string, unknown>, Querystring: Record<string, unknown> }>,
 		reply: FastifyReply,
 	): Promise<void> {
@@ -274,9 +275,9 @@ export class ApiCallService implements OnApplicationShutdown {
 
 	@bindThis
 	private async call(
-		ep: IEndpoint & { exec: any },
+		ep: IEndpoint & { exec: PublicExecutor },
-		user: MiLocalUser | null | undefined,
+		user: MiLocalUser | null,
-		token: MiAccessToken | null | undefined,
+		token: MiAccessToken | null,
 		data: any,
 		multipartFile: MultipartFile | null,
 		request: FastifyRequest<{ Body: Record<string, unknown> | undefined, Querystring: Record<string, unknown> }>,
@@ -430,17 +431,23 @@ export class ApiCallService implements OnApplicationShutdown {
 			cleanup = result.cleanup;
 		}
 
+		const requestData = {
+			ip: request.ip,
+			headers: request.headers,
+			hostname: request.hostname,
+		};
+
 		// API invoking
 		if (this.config.sentryForBackend) {
 			return await Sentry.startSpan({
 				name: 'API: ' + ep.name,
 			}, () => {
-				return ep.exec(data, user, token, attachmentFile, request.ip, request.headers)
+				return ep.exec(data, user, token, attachmentFile, requestData)
 					.catch((err: Error) => this.#onExecError(ep, data, err, user?.id))
 					.finally(() => cleanup());
 			});
 		} else {
-			return await ep.exec(data, user, token, attachmentFile, request.ip, request.headers)
+			return await ep.exec(data, user, token, attachmentFile, requestData)
 				.catch((err: Error) => this.#onExecError(ep, data, err, user?.id))
 				.finally(() => cleanup());
 		}

packages/backend/src/server/api/ApiServerService.ts

@@ -19,6 +19,7 @@ import { SignupApiService } from './SignupApiService.js';
 import { SigninApiService } from './SigninApiService.js';
 import { SigninWithPasskeyApiService } from './SigninWithPasskeyApiService.js';
 import type { FastifyInstance, FastifyPluginOptions } from 'fastify';
+import type { PublicExecutor } from './endpoint-base.js';
 
 @Injectable()
 export class ApiServerService {
@@ -67,7 +68,7 @@ export class ApiServerService {
 				name: endpoint.name,
 				meta: endpoint.meta,
 				params: endpoint.params,
-				exec: this.moduleRef.get('ep:' + endpoint.name, { strict: false }).exec,
+				exec: this.moduleRef.get('ep:' + endpoint.name, { strict: false }).exec as PublicExecutor,
 			};
 
 			if (endpoint.meta.requireFile) {

packages/backend/src/server/api/endpoint-base.ts

@@ -26,18 +26,40 @@ export type AttachmentFile = {
 	path: string;
 };
 
+interface Request {
+	ip: string | null;
+	headers: {
+		[Name in string]?: string | string[]
+	};
+	hostname: string;
+}
+
 // TODO: paramsの型をT['params']のスキーマ定義から推論する
 type Executor<T extends IEndpointMeta, Ps extends Schema> =
-	(params: SchemaType<Ps>, user: T['requireCredential'] extends true ? MiLocalUser : MiLocalUser | null, token: MiAccessToken | null, file?: AttachmentFile, cleanup?: () => any, ip?: string | null, headers?: Record<string, string> | null) =>
+	(
-	Promise<T['res'] extends undefined ? Response : SchemaType<NonNullable<T['res']>>>;
+		params: SchemaType<Ps>,
+		user: T['requireCredential'] extends true ? MiLocalUser : MiLocalUser | null,
+		token: MiAccessToken | null,
+		file: AttachmentFile | null,
+		cleanup: (() => void) | undefined,
+		request: Request,
+	) => Promise<T['res'] extends undefined ? Response : SchemaType<NonNullable<T['res']>>>;
+
+export type PublicExecutor<T extends IEndpointMeta = IEndpointMeta> = (
+	params: any,
+	user: T['requireCredential'] extends true ? MiLocalUser : MiLocalUser | null,
+	token: MiAccessToken | null,
+	file: AttachmentFile | null,
+	request: Request,
+) => Promise<any>;
 
 export abstract class Endpoint<T extends IEndpointMeta, Ps extends Schema> {
-	public exec: (params: any, user: T['requireCredential'] extends true ? MiLocalUser : MiLocalUser | null, token: MiAccessToken | null, file?: AttachmentFile, ip?: string | null, headers?: Record<string, string> | null) => Promise<any>;
+	public exec: PublicExecutor<T>;
 
 	constructor(meta: T, paramDef: Ps, cb: Executor<T, Ps>) {
 		const validate = ajv.compile(paramDef);
 
-		this.exec = (params: any, user: T['requireCredential'] extends true ? MiLocalUser : MiLocalUser | null, token: MiAccessToken | null, file?: AttachmentFile, ip?: string | null, headers?: Record<string, string> | null) => {
+		this.exec = (params: any, user: T['requireCredential'] extends true ? MiLocalUser : MiLocalUser | null, token: MiAccessToken | null, file?: AttachmentFile, request: Request) => {
 			let cleanup: undefined | (() => void) = undefined;
 
 			if (meta.requireFile) {
@@ -54,21 +76,21 @@ export abstract class Endpoint<T extends IEndpointMeta, Ps extends Schema> {
 
 			const valid = validate(params);
 			if (!valid) {
-				if (file) cleanup!();
+				if (file && cleanup) cleanup();
 
-				const errors = validate.errors!;
+				const errors = validate.errors;
 				const err = new ApiError({
 					message: 'Invalid param.',
 					code: 'INVALID_PARAM',
 					id: '3d81ceae-475f-4600-b2a8-2bc116157532',
-				}, {
+				}, errors?.length ? {
 					param: errors[0].schemaPath,
 					reason: errors[0].message,
-				});
+				} : undefined);
 				return Promise.reject(err);
 			}
 
-			return cb(params as SchemaType<Ps>, user, token, file, cleanup, ip, headers);
+			return cb(params as SchemaType<Ps>, user, token, file, cleanup, request);
 		};
 	}
 }

packages/backend/src/server/api/endpoints/drive/files/create.ts

@@ -95,7 +95,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private driveFileEntityService: DriveFileEntityService,
 		private driveService: DriveService,
 	) {
-		super(meta, paramDef, async (ps, me, _, file, cleanup, ip, headers) => {
+		super(meta, paramDef, async (ps, me, _, file, cleanup, { ip, headers }) => {
 			// Get 'name' parameter
 			let name = ps.name ?? file!.name ?? null;
 			if (name != null) {

packages/backend/src/server/api/endpoints/drive/files/upload-from-url.ts

@@ -61,7 +61,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private driveService: DriveService,
 		private globalEventService: GlobalEventService,
 	) {
-		super(meta, paramDef, async (ps, user, _1, _2, _3, ip, headers) => {
+		super(meta, paramDef, async (ps, user, _1, _2, _3, { ip, headers }) => {
 			if (ps.comment && ps.comment.length > this.config.maxAltTextLength) {
 				throw new ApiError(meta.errors.commentTooLong);
 			}

packages/backend/src/server/api/endpoints/i/move.ts

@@ -93,7 +93,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private apPersonService: ApPersonService,
 		private userEntityService: UserEntityService,
 	) {
-		super(meta, paramDef, async (ps, me) => {
+		super(meta, paramDef, async (ps, me, _at, _file, _cleanup, { hostname }) => {
 			// check parameter
 			if (!ps.moveToAccount) throw new ApiError(meta.errors.noSuchUser);
 			// abort if user is the root
@@ -104,7 +104,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			// parse user's input into the destination account
 			const { username, host } = Acct.parse(ps.moveToAccount);
 			// retrieve the destination account
-			let moveTo = await this.remoteUserResolveService.resolveUser(username, host).catch((e) => {
+			let moveTo = await this.remoteUserResolveService.resolveUser(username, host, hostname).catch((e) => {
 				this.apiLoggerService.logger.warn(`failed to resolve remote user: ${e}`);
 				throw new ApiError(meta.errors.noSuchUser);
 			});

packages/backend/src/server/api/endpoints/i/update.ts

@@ -302,7 +302,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private avatarDecorationService: AvatarDecorationService,
 		private utilityService: UtilityService,
 	) {
-		super(meta, paramDef, async (ps, _user, token) => {
+		super(meta, paramDef, async (ps, _user, token, _file, _cleanup, { hostname }) => {
 			const user = await this.usersRepository.findOneByOrFail({ id: _user.id }) as MiLocalUser;
 			const isSecure = token == null;
 
@@ -501,7 +501,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 					const { username, host } = Acct.parse(line);
 
 					// Retrieve the old account
-					const knownAs = await this.remoteUserResolveService.resolveUser(username, host).catch((e) => {
+					const knownAs = await this.remoteUserResolveService.resolveUser(username, host, hostname).catch((e) => {
 						this.apiLoggerService.logger.warn(`failed to resolve dstination user: ${e}`);
 						throw new ApiError(meta.errors.noSuchUser);
 					});

packages/backend/src/server/api/endpoints/meta.ts

@@ -40,8 +40,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 	constructor(
 		private metaEntityService: MetaEntityService,
 	) {
-		super(meta, paramDef, async (ps, me) => {
+		super(meta, paramDef, async (ps, _me, _at, _file, _cleanup, { hostname }) => {
-			return ps.detail ? await this.metaEntityService.packDetailed() : await this.metaEntityService.pack();
+			return ps.detail
+				? await this.metaEntityService.packDetailed(undefined, hostname)
+				: await this.metaEntityService.pack(undefined, hostname);
 		});
 	}
 }

packages/backend/src/server/api/endpoints/users/show.ts

@@ -98,7 +98,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private perUserPvChart: PerUserPvChart,
 		private apiLoggerService: ApiLoggerService,
 	) {
-		super(meta, paramDef, async (ps, me, _1, _2, _3, ip) => {
+		super(meta, paramDef, async (ps, me, _1, _2, _3, { ip, hostname }) => {
 			let user;
 
 			const isModerator = await this.roleService.isModerator(me);
@@ -130,7 +130,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			} else {
 				// Lookup user
 				if (typeof ps.host === 'string' && typeof ps.username === 'string') {
-					user = await this.remoteUserResolveService.resolveUser(ps.username, ps.host).catch(err => {
+					user = await this.remoteUserResolveService.resolveUser(ps.username, ps.host, hostname).catch(err => {
 						this.apiLoggerService.logger.warn(`failed to resolve remote user: ${err}`);
 						throw new ApiError(meta.errors.failedToResolveRemoteUser);
 					});

packages/backend/src/server/web/ClientServerService.ts

@@ -59,6 +59,7 @@ import { FlashEntityService } from '@/core/entities/FlashEntityService.js';
 import { RoleService } from '@/core/RoleService.js';
 import { ReversiGameEntityService } from '@/core/entities/ReversiGameEntityService.js';
 import { AnnouncementEntityService } from '@/core/entities/AnnouncementEntityService.js';
+import { UtilityService } from '@/core/UtilityService.js';
 import { FeedService } from './FeedService.js';
 import { UrlPreviewService } from './UrlPreviewService.js';
 import { ClientLoggerService } from './ClientLoggerService.js';
@@ -130,6 +131,7 @@ export class ClientServerService {
 		private feedService: FeedService,
 		private roleService: RoleService,
 		private clientLoggerService: ClientLoggerService,
+		private readonly utilityService: UtilityService,
 
 		@Inject('queue:system') public systemQueue: SystemQueue,
 		@Inject('queue:endedPollNotification') public endedPollNotificationQueue: EndedPollNotificationQueue,
@@ -146,14 +148,14 @@ export class ClientServerService {
 	}
 
 	@bindThis
-	private async manifestHandler(reply: FastifyReply) {
+	private async manifestHandler(reply: FastifyReply, hostname: string) {
 		let manifest = {
 			// 空文字列の場合右辺を使いたいため
 			// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-			'short_name': this.meta.shortName || this.meta.name || this.config.host,
+			'short_name': this.meta.shortName || this.meta.name || hostname,
 			// 空文字列の場合右辺を使いたいため
 			// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-			'name': this.meta.name || this.config.host,
+			'name': this.meta.name || hostname,
 			'start_url': '/',
 			'display': 'standalone',
 			'background_color': '#313a42',
@@ -415,7 +417,7 @@ export class ClientServerService {
 		});
 
 		// Manifest
-		fastify.get('/manifest.json', async (request, reply) => await this.manifestHandler(reply));
+		fastify.get('/manifest.json', async (request, reply) => await this.manifestHandler(reply, request.hostname));
 
 		// Embed Javascript
 		fastify.get('/embed.js', async (request, reply) => {
@@ -467,11 +469,11 @@ export class ClientServerService {
 		// URL preview endpoint
 		fastify.get<{ Querystring: { url: string; lang: string; } }>('/url', (request, reply) => this.urlPreviewService.handle(request, reply));
 
-		const getFeed = async (acct: string) => {
+		const getFeed = async (acct: string, hostname: string) => {
 			const { username, host } = Acct.parse(acct);
 			const user = await this.usersRepository.findOneBy({
 				usernameLower: username.toLowerCase(),
-				host: host ?? IsNull(),
+				host: host ?? this.utilityService.getSelfQueryHost(hostname),
 				isSuspended: false,
 				enableRss: true,
 				requireSigninToViewContents: false,
@@ -484,7 +486,7 @@ export class ClientServerService {
 		fastify.get<{ Params: { user?: string; } }>('/@:user.atom', async (request, reply) => {
 			if (request.params.user == null) return await renderBase(reply);
 
-			const feed = await getFeed(request.params.user);
+			const feed = await getFeed(request.params.user, request.hostname);
 
 			if (feed) {
 				reply.header('Content-Type', 'application/atom+xml; charset=utf-8');
@@ -499,7 +501,7 @@ export class ClientServerService {
 		fastify.get<{ Params: { user?: string; } }>('/@:user.rss', async (request, reply) => {
 			if (request.params.user == null) return await renderBase(reply);
 
-			const feed = await getFeed(request.params.user);
+			const feed = await getFeed(request.params.user, request.hostname);
 
 			if (feed) {
 				reply.header('Content-Type', 'application/rss+xml; charset=utf-8');
@@ -514,7 +516,7 @@ export class ClientServerService {
 		fastify.get<{ Params: { user?: string; } }>('/@:user.json', async (request, reply) => {
 			if (request.params.user == null) return await renderBase(reply);
 
-			const feed = await getFeed(request.params.user);
+			const feed = await getFeed(request.params.user, request.hostname);
 
 			if (feed) {
 				reply.header('Content-Type', 'application/json; charset=utf-8');
@@ -531,7 +533,7 @@ export class ClientServerService {
 			const { username, host } = Acct.parse(request.params.user);
 			const user = await this.usersRepository.findOneBy({
 				usernameLower: username.toLowerCase(),
-				host: host ?? IsNull(),
+				host: host ?? this.utilityService.getSelfQueryHost(request.hostname),
 				isSuspended: false,
 			});
 
@@ -575,7 +577,7 @@ export class ClientServerService {
 		fastify.get<{ Params: { user: string; } }>('/users/:user', async (request, reply) => {
 			const user = await this.usersRepository.findOneBy({
 				id: request.params.user,
-				host: IsNull(),
+				host: this.utilityService.getSelfQueryHost(request.hostname),
 				isSuspended: false,
 			});
 
@@ -586,7 +588,8 @@ export class ClientServerService {
 
 			vary(reply.raw, 'Accept');
 
-			reply.redirect(`/@${user.username}${ user.host == null ? '' : '@' + user.host}`);
+			const dbHost = this.utilityService.getSelfDbHost(request.hostname);
+			reply.redirect(`/@${user.username}${ user.host === dbHost ? '' : '@' + user.host}`);
 		});
 
 		// Note
@@ -630,7 +633,7 @@ export class ClientServerService {
 			const { username, host } = Acct.parse(request.params.user);
 			const user = await this.usersRepository.findOneBy({
 				usernameLower: username.toLowerCase(),
-				host: host ?? IsNull(),
+				host: host ?? this.utilityService.getSelfQueryHost(request.hostname),
 			});
 
 			if (user == null) return;
@@ -813,10 +816,10 @@ export class ClientServerService {
 
 			const user = await this.usersRepository.findOneBy({
 				id: request.params.user,
+				host: this.utilityService.getSelfQueryHost(request.hostname),
 			});
 
 			if (user == null) return;
-			if (user.host != null) return;
 
 			const _user = await this.userEntityService.pack(user);
 
@@ -835,11 +838,11 @@ export class ClientServerService {
 
 			const note = await this.notesRepository.findOneBy({
 				id: request.params.note,
+				userHost: this.utilityService.getSelfQueryHost(request.hostname),
 			});
 
 			if (note == null) return;
 			if (['specified', 'followers'].includes(note.visibility)) return;
-			if (note.userHost != null) return;
 
 			const _note = await this.noteEntityService.pack(note, null, { detail: true });
 
@@ -887,12 +890,13 @@ export class ClientServerService {
 		fastify.get('/_info_card_', async (request, reply) => {
 			reply.removeHeader('X-Frame-Options');
 
+			const queryHost = this.utilityService.getSelfQueryHost(request.hostname);
 			return await reply.view('info-card', {
 				version: this.config.version,
-				host: this.config.host,
+				host: request.hostname,
 				meta: this.meta,
-				originalUsersCount: await this.usersRepository.countBy({ host: IsNull() }),
+				originalUsersCount: await this.usersRepository.countBy({ host: queryHost }),
-				originalNotesCount: await this.notesRepository.countBy({ userHost: IsNull() }),
+				originalNotesCount: await this.notesRepository.countBy({ userHost: queryHost }),
 			});
 		});
 		//#endregion

packages/backend/test/unit/activitypub.ts

@@ -10,7 +10,7 @@ import { Test } from '@nestjs/testing';
 import { jest } from '@jest/globals';
 
 import type { Config } from '@/config.js';
-import type { MiLocalUser, MiRemoteUser } from '@/models/User.js';
+import type { MiLocalUser, MiPartialUser, MiRemoteUser } from '@/models/User.js';
 import { ApImageService } from '@/core/activitypub/models/ApImageService.js';
 import { ApNoteService } from '@/core/activitypub/models/ApNoteService.js';
 import { ApPersonService } from '@/core/activitypub/models/ApPersonService.js';
@@ -276,7 +276,11 @@ describe('ActivityPub', () => {
 			rendererService.renderAnnounce('https://example.com/notes/00example', {
 				id: genAidx(Date.now()),
 				visibility: 'followers',
-			} as MiNote);
+			} as MiNote, {
+				id: genAidx(Date.now()),
+				host: null,
+				uri: null,
+			} as MiPartialUser);
 		});
 	});
 

packages/frontend/src/pages/note.vue

@@ -19,7 +19,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 							<MkButton rounded :class="$style.loadButton" @click="showNext = 'user'"><i class="ti ti-chevron-up"></i> <i class="ti ti-user"></i></MkButton>
 						</div>
 						<div class="_margin _gaps_s">
-							<MkRemoteCaution v-if="note.user.host != null" :href="note.url ?? note.uri"/>
+							<MkRemoteCaution v-if="!instance.localHosts.includes(note.user.host)" :href="note.url ?? note.uri"/>
 							<SkErrorList :errors="note.processErrors"/>
 							<DynamicNoteDetailed :key="note.id" v-model:note="note" :initialTab="initialTab" :class="$style.note" :expandAllCws="expandAllCws"/>
 						</div>
@@ -67,6 +67,7 @@ import { pleaseLogin } from '@/utility/please-login.js';
 import { getAppearNote } from '@/utility/get-appear-note.js';
 import { serverContext, assertServerContext } from '@/server-context.js';
 import { $i } from '@/i.js';
+import { instance } from '@/instance.js';
 
 // contextは非ログイン状態の情報しかないためログイン時は利用できない
 const CTX_NOTE = !$i && assertServerContext(serverContext, 'note') ? serverContext.note : null;

packages/frontend/src/pages/user/home.vue

@@ -12,7 +12,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 			<div class="profile _gaps">
 				<MkAccountMoved v-if="user.movedTo" :movedTo="user.movedTo"/>
-				<MkRemoteCaution v-if="user.host != null" :href="user.url ?? user.uri!"/>
+				<MkRemoteCaution v-if="!instance.localHosts.includes(user.host)" :href="user.url ?? user.uri!"/>
 				<MkInfo v-if="user.host == null && user.username.includes('.')">{{ i18n.ts.isSystemAccount }}</MkInfo>
 
 				<div :key="user.id" class="main _panel">
@@ -220,7 +220,7 @@ import { misskeyApi } from '@/utility/misskey-api.js';
 import { isFollowingVisibleForMe, isFollowersVisibleForMe } from '@/utility/isFfVisibleForMe.js';
 import { useRouter } from '@/router.js';
 import { getStaticImageUrl } from '@/utility/media-proxy.js';
-import { infoImageUrl } from '@/instance.js';
+import { infoImageUrl, instance } from '@/instance.js';
 import MkSparkle from '@/components/MkSparkle.vue';
 import { prefer } from '@/preferences.js';
 import DynamicNote from '@/components/DynamicNote.vue';

packages/misskey-js/src/autogen/types.ts

@@ -5709,6 +5709,7 @@ export type components = {
       cacheRemoteSensitiveFiles: boolean;
       /** @enum {string} */
       allowUnsignedFetch: 'never' | 'always' | 'essential';
+      localHosts: (string | null)[];
     };
     MetaDetailed: components['schemas']['MetaLite'] & components['schemas']['MetaDetailedOnly'];
     SystemWebhook: {