merge: Add "force content warning" setting for user moderation (resolves #905) (!876)

View MR for information: https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/876

Closes #905

Approved-by: dakkar <dakkar@thenautilus.net>
Approved-by: Marie <github@yuugi.dev>

46 files changed, 843 insertions, 108 deletions

diff --git a/locales/index.d.ts b/locales/index.d.ts
index 9624b48b42..bf49869bf8 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -8555,6 +8555,10 @@ export interface Locale extends ILocale {
          */
         "write:admin:unnsfw-user": string;
         /**
+         * Apply mandatory CW on users
+         */
+        "write:admin:cw-user": string;
+        /**
          * Silence users
          */
         "write:admin:silence-user": string;
@@ -10215,6 +10219,14 @@ export interface Locale extends ILocale {
          */
         "approve": string;
         /**
+         * Declined
+         */
+        "decline": string;
+        /**
+         * Set content warning for user
+         */
+        "setMandatoryCW": string;
+        /**
          * Set remote instance as NSFW
          */
         "setRemoteInstanceNSFW": string;
@@ -12089,6 +12101,14 @@ export interface Locale extends ILocale {
      * ID
      */
     "id": string;
+    /**
+     * Force content warning
+     */
+    "mandatoryCW": string;
+    /**
+     * Applies a content warning to all posts created by this user. If the post already has a CW, then this is appended to the end.
+     */
+    "mandatoryCWDescription": string;
 }
 declare const locales: {
     [lang: string]: Locale;
diff --git a/packages/backend/migration/1738043621143-add_user_mandatoryCW.js b/packages/backend/migration/1738043621143-add_user_mandatoryCW.js
new file mode 100644
index 0000000000..dd05076dd2
--- /dev/null
+++ b/packages/backend/migration/1738043621143-add_user_mandatoryCW.js
@@ -0,0 +1,11 @@
+export class AddUserMandatoryCW1738043621143 {
+	name = 'AddUserCW1738043621143'
+
+	async up(queryRunner) {
+		await queryRunner.query(`ALTER TABLE "user" ADD "mandatoryCW" text`);
+	}
+
+	async down(queryRunner) {
+		await queryRunner.query(`ALTER TABLE "user" DROP COLUMN "mandatoryCW"`);
+	}
+}
diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index 3bfced1d80..8291db9b42 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -228,7 +228,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 	}
 
 	@bindThis
-	public async create(user: {
+	public async create(user: MiUser & {
 		id: MiUser['id'];
 		username: MiUser['username'];
 		host: MiUser['host'];
@@ -435,7 +435,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 	}
 
 	@bindThis
-	public async import(user: {
+	public async import(user: MiUser & {
 		id: MiUser['id'];
 		username: MiUser['username'];
 		host: MiUser['host'];
@@ -486,10 +486,10 @@ export class NoteCreateService implements OnApplicationShutdown {
 
 		// should really not happen, but better safe than sorry
 		if (data.reply?.id === insert.id) {
-			throw new Error("A note can't reply to itself");
+			throw new Error('A note can\'t reply to itself');
 		}
 		if (data.renote?.id === insert.id) {
-			throw new Error("A note can't renote itself");
+			throw new Error('A note can\'t renote itself');
 		}
 
 		if (data.uri != null) insert.uri = data.uri;
@@ -552,7 +552,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 	}
 
 	@bindThis
-	private async postNoteCreated(note: MiNote, user: {
+	private async postNoteCreated(note: MiNote, user: MiUser & {
 		id: MiUser['id'];
 		username: MiUser['username'];
 		host: MiUser['host'];
@@ -753,7 +753,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 			//#region AP deliver
 			if (!data.localOnly && this.userEntityService.isLocalUser(user)) {
 				(async () => {
-					const noteActivity = await this.renderNoteOrRenoteActivity(data, note);
+					const noteActivity = await this.renderNoteOrRenoteActivity(data, note, user);
 					const dm = this.apDeliverManagerService.createDeliverManager(user, noteActivity);
 
 					// メンションされたリモートユーザーに配送
@@ -899,12 +899,12 @@ export class NoteCreateService implements OnApplicationShutdown {
 	}
 
 	@bindThis
-	private async renderNoteOrRenoteActivity(data: Option, note: MiNote) {
+	private async renderNoteOrRenoteActivity(data: Option, note: MiNote, user: MiUser) {
 		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.renderCreate(await this.apRendererService.renderNote(note, false), note);
+			: this.apRendererService.renderCreate(await this.apRendererService.renderNote(note, user, false), note);
 
 		return this.apRendererService.addContext(content);
 	}
diff --git a/packages/backend/src/core/NoteEditService.ts b/packages/backend/src/core/NoteEditService.ts
index 453ad5d9d0..24a99156d2 100644
--- a/packages/backend/src/core/NoteEditService.ts
+++ b/packages/backend/src/core/NoteEditService.ts
@@ -224,7 +224,7 @@ export class NoteEditService implements OnApplicationShutdown {
 	}
 
 	@bindThis
-	public async edit(user: {
+	public async edit(user: MiUser & {
 		id: MiUser['id'];
 		username: MiUser['username'];
 		host: MiUser['host'];
@@ -309,7 +309,7 @@ export class NoteEditService implements OnApplicationShutdown {
 
 		if (this.isRenote(data)) {
 			if (data.renote.id === oldnote.id) {
-				throw new Error("A note can't renote itself");
+				throw new Error('A note can\'t renote itself');
 			}
 
 			switch (data.renote.visibility) {
@@ -584,7 +584,7 @@ export class NoteEditService implements OnApplicationShutdown {
 	}
 
 	@bindThis
-	private async postNoteEdited(note: MiNote, oldNote: MiNote, user: {
+	private async postNoteEdited(note: MiNote, oldNote: MiNote, user: MiUser & {
 		id: MiUser['id'];
 		username: MiUser['username'];
 		host: MiUser['host'];
@@ -703,7 +703,7 @@ export class NoteEditService implements OnApplicationShutdown {
 			//#region AP deliver
 			if (!data.localOnly && this.userEntityService.isLocalUser(user)) {
 				(async () => {
-					const noteActivity = await this.renderNoteOrRenoteActivity(data, note);
+					const noteActivity = await this.renderNoteOrRenoteActivity(data, note, user);
 					const dm = this.apDeliverManagerService.createDeliverManager(user, noteActivity);
 
 					// メンションされたリモートユーザーに配送
@@ -834,14 +834,12 @@ export class NoteEditService implements OnApplicationShutdown {
 	}
 
 	@bindThis
-	private async renderNoteOrRenoteActivity(data: Option, note: MiNote) {
+	private async renderNoteOrRenoteActivity(data: Option, note: MiNote, user: MiUser) {
 		if (data.localOnly) return null;
-		const user = await this.usersRepository.findOneBy({ id: note.userId });
-		if (user == null) throw new Error('user not found');
 
 		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.renderUpdate(await this.apRendererService.renderUpNote(note, false), user);
+			: this.apRendererService.renderUpdate(await this.apRendererService.renderUpNote(note, user, false), user);
 
 		return this.apRendererService.addContext(content);
 	}
diff --git a/packages/backend/src/core/PollService.ts b/packages/backend/src/core/PollService.ts
index 6c96ab16cf..d6364613bd 100644
--- a/packages/backend/src/core/PollService.ts
+++ b/packages/backend/src/core/PollService.ts
@@ -100,7 +100,7 @@ export class PollService {
 		if (user == null) throw new Error('note not found');
 
 		if (this.userEntityService.isLocalUser(user)) {
-			const content = this.apRendererService.addContext(this.apRendererService.renderUpdate(await this.apRendererService.renderNote(note, false), user));
+			const content = this.apRendererService.addContext(this.apRendererService.renderUpdate(await this.apRendererService.renderNote(note, user, false), user));
 			this.apDeliverManagerService.deliverToFollowers(user, content);
 			this.relayService.deliverToRelays(user, content);
 		}
diff --git a/packages/backend/src/core/WebhookTestService.ts b/packages/backend/src/core/WebhookTestService.ts
index dfe7a259c4..93693216cb 100644
--- a/packages/backend/src/core/WebhookTestService.ts
+++ b/packages/backend/src/core/WebhookTestService.ts
@@ -99,6 +99,7 @@ function generateDummyUser(override?: Partial<MiUser>): MiUser {
 		signupReason: null,
 		noindex: false,
 		enableRss: true,
+		mandatoryCW: null,
 		...override,
 	};
 }
@@ -216,6 +217,7 @@ function toPackedUserLite(user: MiUser, override?: Packed<'UserLite'>): Packed<'
 		isSystem: false,
 		isSilenced: user.isSilenced,
 		enableRss: true,
+		mandatoryCW: null,
 		...override,
 	};
 }
diff --git a/packages/backend/src/core/activitypub/ApRendererService.ts b/packages/backend/src/core/activitypub/ApRendererService.ts
index 721cb77b2f..cb9b74f6d7 100644
--- a/packages/backend/src/core/activitypub/ApRendererService.ts
+++ b/packages/backend/src/core/activitypub/ApRendererService.ts
@@ -28,6 +28,7 @@ import type { UsersRepository, UserProfilesRepository, NotesRepository, DriveFil
 import { bindThis } from '@/decorators.js';
 import { CustomEmojiService } from '@/core/CustomEmojiService.js';
 import { IdService } from '@/core/IdService.js';
+import { appendContentWarning } from '@/misc/append-content-warning.js';
 import { JsonLdService } from './JsonLdService.js';
 import { ApMfmService } from './ApMfmService.js';
 import { CONTEXT } from './misc/contexts.js';
@@ -339,7 +340,7 @@ export class ApRendererService {
 	}
 
 	@bindThis
-	public async renderNote(note: MiNote, dive = true): Promise<IPost> {
+	public async renderNote(note: MiNote, author: MiUser, dive = true): Promise<IPost> {
 		const getPromisedFiles = async (ids: string[]): Promise<MiDriveFile[]> => {
 			if (ids.length === 0) return [];
 			const items = await this.driveFilesRepository.findBy({ id: In(ids) });
@@ -353,14 +354,14 @@ export class ApRendererService {
 			inReplyToNote = await this.notesRepository.findOneBy({ id: note.replyId });
 
 			if (inReplyToNote != null) {
-				const inReplyToUserExist = await this.usersRepository.exists({ where: { id: inReplyToNote.userId } });
+				const inReplyToUser = await this.usersRepository.findOneBy({ id: inReplyToNote.userId });
 
-				if (inReplyToUserExist) {
+				if (inReplyToUser) {
 					if (inReplyToNote.uri) {
 						inReplyTo = inReplyToNote.uri;
 					} else {
 						if (dive) {
-							inReplyTo = await this.renderNote(inReplyToNote, false);
+							inReplyTo = await this.renderNote(inReplyToNote, inReplyToUser, false);
 						} else {
 							inReplyTo = `${this.config.url}/notes/${inReplyToNote.id}`;
 						}
@@ -423,7 +424,12 @@ export class ApRendererService {
 			apAppend += `\n\nRE: ${quote}`;
 		}
 
-		const summary = note.cw === '' ? String.fromCharCode(0x200B) : note.cw;
+		let summary = note.cw === '' ? String.fromCharCode(0x200B) : note.cw;
+
+		// Apply mandatory CW, if applicable
+		if (author.mandatoryCW) {
+			summary = appendContentWarning(summary, author.mandatoryCW);
+		}
 
 		const { content } = this.apMfmService.getNoteHtml(note, apAppend);
 
@@ -636,7 +642,7 @@ export class ApRendererService {
 	}
 
 	@bindThis
-	public async renderUpNote(note: MiNote, dive = true): Promise<IPost> {
+	public async renderUpNote(note: MiNote, author: MiUser, dive = true): Promise<IPost> {
 		const getPromisedFiles = async (ids: string[]): Promise<MiDriveFile[]> => {
 			if (ids.length === 0) return [];
 			const items = await this.driveFilesRepository.findBy({ id: In(ids) });
@@ -650,14 +656,14 @@ export class ApRendererService {
 			inReplyToNote = await this.notesRepository.findOneBy({ id: note.replyId });
 
 			if (inReplyToNote != null) {
-				const inReplyToUserExist = await this.usersRepository.exists({ where: { id: inReplyToNote.userId } });
+				const inReplyToUser = await this.usersRepository.findOneBy({ id: inReplyToNote.userId });
 
-				if (inReplyToUserExist) {
+				if (inReplyToUser) {
 					if (inReplyToNote.uri) {
 						inReplyTo = inReplyToNote.uri;
 					} else {
 						if (dive) {
-							inReplyTo = await this.renderUpNote(inReplyToNote, false);
+							inReplyTo = await this.renderUpNote(inReplyToNote, inReplyToUser, false);
 						} else {
 							inReplyTo = `${this.config.url}/notes/${inReplyToNote.id}`;
 						}
@@ -720,7 +726,12 @@ export class ApRendererService {
 			apAppend += `\n\nRE: ${quote}`;
 		}
 
-		const summary = note.cw === '' ? String.fromCharCode(0x200B) : note.cw;
+		let summary = note.cw === '' ? String.fromCharCode(0x200B) : note.cw;
+
+		// Apply mandatory CW, if applicable
+		if (author.mandatoryCW) {
+			summary = appendContentWarning(summary, author.mandatoryCW);
+		}
 
 		const { content } = this.apMfmService.getNoteHtml(note, apAppend);
 
diff --git a/packages/backend/src/core/activitypub/ApResolverService.ts b/packages/backend/src/core/activitypub/ApResolverService.ts
index 410803609c..f5b63a2827 100644
--- a/packages/backend/src/core/activitypub/ApResolverService.ts
+++ b/packages/backend/src/core/activitypub/ApResolverService.ts
@@ -209,11 +209,12 @@ export class Resolver {
 			case 'notes':
 				return this.notesRepository.findOneByOrFail({ id: parsed.id })
 					.then(async note => {
+						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), note));
+							return this.apRendererService.addContext(this.apRendererService.renderCreate(await this.apRendererService.renderNote(note, author), note));
 						} else {
-							return this.apRendererService.renderNote(note);
+							return this.apRendererService.renderNote(note, author);
 						}
 					});
 			case 'users':
diff --git a/packages/backend/src/core/entities/UserEntityService.ts b/packages/backend/src/core/entities/UserEntityService.ts
index ef0b5213c8..4fbbbdd379 100644
--- a/packages/backend/src/core/entities/UserEntityService.ts
+++ b/packages/backend/src/core/entities/UserEntityService.ts
@@ -592,6 +592,7 @@ export class UserEntityService implements OnModuleInit {
 			isCat: user.isCat,
 			noindex: user.noindex,
 			enableRss: user.enableRss,
+			mandatoryCW: user.mandatoryCW,
 			isSilenced: user.isSilenced || this.roleService.getUserPolicies(user.id).then(r => !r.canPublicNote),
 			speakAsCat: user.speakAsCat ?? false,
 			approved: user.approved,
diff --git a/packages/backend/src/misc/append-content-warning.ts b/packages/backend/src/misc/append-content-warning.ts
new file mode 100644
index 0000000000..152cd6760e
--- /dev/null
+++ b/packages/backend/src/misc/append-content-warning.ts
@@ -0,0 +1,62 @@
+/*
+ * SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/*
+ * Important Note: this file must be kept in sync with packages/frontend-shared/js/append-content-warning.ts
+ */
+
+/**
+ * Appends an additional content warning onto an existing one.
+ * The additional value will not be added if it already exists within the original input.
+ * @param original Existing content warning
+ * @param additional Content warning to append
+ * @param reverse If true, then the additional CW will be prepended instead of appended.
+ */
+export function appendContentWarning(original: string | null | undefined, additional: string, reverse = false): string {
+	// Easy case - if original is empty, then additional replaces it.
+	if (!original) {
+		return additional;
+	}
+
+	// Easy case - if the additional CW is empty, then don't append it.
+	if (!additional) {
+		return original;
+	}
+
+	// If the additional CW already exists in the input, then we *don't* append another copy!
+	if (includesWholeWord(original, additional)) {
+		return original;
+	}
+
+	return reverse
+		? `${additional}, ${original}`
+		: `${original}, ${additional}`;
+}
+
+/**
+ * Emulates a regular expression like /\b(pattern)\b/, but with a raw non-regex pattern.
+ * We're checking to see whether the default CW appears inside the existing CW, but *only* if there's word boundaries on either side.
+ * @param input Input string to search
+ * @param target Target word / phrase to search for
+ */
+function includesWholeWord(input: string, target: string): boolean {
+	const parts = input.split(target);
+
+	// The additional string could appear multiple times within the original input.
+	// We need to check each occurrence, since any of them could potentially match.
+	for (let i = 0; i + 1 < parts.length; i++) {
+		const before = parts[i];
+		const after = parts[i + 1];
+
+		// If either the preceding or following tokens are a "word", then this "match" is actually just part of a longer word.
+		// Likewise, if *neither* token is a word, then this is a real match and the CW already exists in the input.
+		if (!/\w$/.test(before) && !/^\w/.test(after)) {
+			return true;
+		}
+	}
+
+	// If we don't match, then there is no existing CW.
+	return false;
+}
diff --git a/packages/backend/src/misc/get-note-summary.ts b/packages/backend/src/misc/get-note-summary.ts
index 60dddee9a2..be2d3ea98d 100644
--- a/packages/backend/src/misc/get-note-summary.ts
+++ b/packages/backend/src/misc/get-note-summary.ts
@@ -3,6 +3,7 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+import { appendContentWarning } from './append-content-warning.js';
 import type { Packed } from './json-schema.js';
 
 /**
@@ -20,9 +21,15 @@ export const getNoteSummary = (note: Packed<'Note'>): string => {
 
 	let summary = '';
 
+	// Append mandatory CW, if applicable
+	let cw = note.cw;
+	if (note.user.mandatoryCW) {
+		cw = appendContentWarning(cw, note.user.mandatoryCW);
+	}
+
 	// 本文
-	if (note.cw != null) {
-		summary += `CW: ${note.cw}`;
+	if (cw != null) {
+		summary += `CW: ${cw}`;
 	} else if (note.text) {
 		summary += note.text;
 	}
diff --git a/packages/backend/src/models/User.ts b/packages/backend/src/models/User.ts
index 3a825d36a7..8a3ad1003d 100644
--- a/packages/backend/src/models/User.ts
+++ b/packages/backend/src/models/User.ts
@@ -339,6 +339,15 @@ export class MiUser {
 	})
 	public enableRss: boolean;
 
+	/**
+	 * Specifies a Content Warning that should be forcibly applied to all notes by this user.
+	 * If null (default), then no Content Warning is applied.
+	 */
+	@Column('text', {
+		nullable: true,
+	})
+	public mandatoryCW: string | null;
+
 	constructor(data: Partial<MiUser>) {
 		if (data == null) return;
 
diff --git a/packages/backend/src/models/json-schema/user.ts b/packages/backend/src/models/json-schema/user.ts
index 93b031e9c5..1c2ba538c1 100644
--- a/packages/backend/src/models/json-schema/user.ts
+++ b/packages/backend/src/models/json-schema/user.ts
@@ -134,6 +134,10 @@ export const packedUserLiteSchema = {
 			type: 'boolean',
 			nullable: false, optional: false,
 		},
+		mandatoryCW: {
+			type: 'string',
+			nullable: true, optional: false,
+		},
 		isBot: {
 			type: 'boolean',
 			nullable: false, optional: true,
diff --git a/packages/backend/src/server/ActivityPubServerService.ts b/packages/backend/src/server/ActivityPubServerService.ts
index 72faa3318c..10dba1660f 100644
--- a/packages/backend/src/server/ActivityPubServerService.ts
+++ b/packages/backend/src/server/ActivityPubServerService.ts
@@ -103,15 +103,16 @@ export class ActivityPubServerService {
 	/**
 	 * Pack Create<Note> or Announce Activity
 	 * @param note Note
+	 * @param author Author of the note
 	 */
 	@bindThis
-	private async packActivity(note: MiNote): Promise<any> {
+	private async packActivity(note: MiNote, author: MiUser): Promise<any> {
 		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.renderCreate(await this.apRendererService.renderNote(note, false), note);
+		return this.apRendererService.renderCreate(await this.apRendererService.renderNote(note, author, false), note);
 	}
 
 	@bindThis
@@ -506,7 +507,7 @@ export class ActivityPubServerService {
 			this.notesRepository.findOneByOrFail({ id: pining.noteId }))))
 			.filter(note => !note.localOnly && ['public', 'home'].includes(note.visibility));
 
-		const renderedNotes = await Promise.all(pinnedNotes.map(note => this.apRendererService.renderNote(note)));
+		const renderedNotes = await Promise.all(pinnedNotes.map(note => this.apRendererService.renderNote(note, user)));
 
 		const rendered = this.apRendererService.renderOrderedCollection(
 			`${this.config.url}/users/${userId}/collections/featured`,
@@ -579,7 +580,7 @@ export class ActivityPubServerService {
 
 			if (sinceId) notes.reverse();
 
-			const activities = await Promise.all(notes.map(note => this.packActivity(note)));
+			const activities = await Promise.all(notes.map(note => this.packActivity(note, user)));
 			const rendered = this.apRendererService.renderOrderedCollectionPage(
 				`${partOf}?${url.query({
 					page: 'true',
@@ -723,7 +724,9 @@ export class ActivityPubServerService {
 
 			if (!this.config.checkActivityPubGetSignature) reply.header('Cache-Control', 'public, max-age=180');
 			this.setResponseType(request, reply);
-			return this.apRendererService.addContext(await this.apRendererService.renderNote(note, false));
+
+			const author = await this.usersRepository.findOneByOrFail({ id: note.userId });
+			return this.apRendererService.addContext(await this.apRendererService.renderNote(note, author, false));
 		});
 
 		// note activity
@@ -746,7 +749,9 @@ export class ActivityPubServerService {
 
 			if (!this.config.checkActivityPubGetSignature) reply.header('Cache-Control', 'public, max-age=180');
 			this.setResponseType(request, reply);
-			return (this.apRendererService.addContext(await this.packActivity(note)));
+
+			const author = await this.usersRepository.findOneByOrFail({ id: note.userId });
+			return (this.apRendererService.addContext(await this.packActivity(note, author)));
 		});
 
 		// outbox
diff --git a/packages/backend/src/server/api/endpoint-list.ts b/packages/backend/src/server/api/endpoint-list.ts
index 6dce7f1a3d..551d7b17c2 100644
--- a/packages/backend/src/server/api/endpoint-list.ts
+++ b/packages/backend/src/server/api/endpoint-list.ts
@@ -34,6 +34,7 @@ export * as 'admin/avatar-decorations/list' from './endpoints/admin/avatar-decor
 export * as 'admin/avatar-decorations/update' from './endpoints/admin/avatar-decorations/update.js';
 export * as 'admin/captcha/current' from './endpoints/admin/captcha/current.js';
 export * as 'admin/captcha/save' from './endpoints/admin/captcha/save.js';
+export * as 'admin/cw-user' from './endpoints/admin/cw-user.js';
 export * as 'admin/decline-user' from './endpoints/admin/decline-user.js';
 export * as 'admin/delete-account' from './endpoints/admin/delete-account.js';
 export * as 'admin/delete-all-files-of-a-user' from './endpoints/admin/delete-all-files-of-a-user.js';
diff --git a/packages/backend/src/server/api/endpoints/admin/cw-user.ts b/packages/backend/src/server/api/endpoints/admin/cw-user.ts
new file mode 100644
index 0000000000..bdcfa6a0d9
--- /dev/null
+++ b/packages/backend/src/server/api/endpoints/admin/cw-user.ts
@@ -0,0 +1,67 @@
+/*
+ * SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import type { UsersRepository } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';
+import { CacheService } from '@/core/CacheService.js';
+import { GlobalEventService } from '@/core/GlobalEventService.js';
+import { ModerationLogService } from '@/core/ModerationLogService.js';
+
+export const meta = {
+	tags: ['admin'],
+
+	requireCredential: true,
+	requireModerator: true,
+	kind: 'write:admin:cw-user',
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		userId: { type: 'string', format: 'misskey:id' },
+		cw: { type: 'string', nullable: true },
+	},
+	required: ['userId', 'cw'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		@Inject(DI.usersRepository)
+		private readonly usersRepository: UsersRepository,
+
+		private readonly globalEventService: GlobalEventService,
+		private readonly cacheService: CacheService,
+		private readonly moderationLogService: ModerationLogService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			const user = await this.cacheService.findUserById(ps.userId);
+
+			// Skip if there's nothing to do
+			if (user.mandatoryCW === ps.cw) return;
+
+			// Log event first.
+			// This ensures that we don't "lose" the log if an error occurs
+			await this.moderationLogService.log(me, 'setMandatoryCW', {
+				newCW: ps.cw,
+				oldCW: user.mandatoryCW,
+				userId: user.id,
+				userUsername: user.username,
+				userHost: user.host,
+			});
+
+			await this.usersRepository.update(ps.userId, {
+				// Collapse empty strings to null
+				// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
+				mandatoryCW: ps.cw || null,
+			});
+
+			// Synchronize caches and other processes
+			this.globalEventService.publishInternalEvent('localUserUpdated', { id: ps.userId });
+		});
+	}
+}
diff --git a/packages/backend/src/server/api/endpoints/admin/nsfw-user.ts b/packages/backend/src/server/api/endpoints/admin/nsfw-user.ts
index d3fa4251dd..f64ba7f48a 100644
--- a/packages/backend/src/server/api/endpoints/admin/nsfw-user.ts
+++ b/packages/backend/src/server/api/endpoints/admin/nsfw-user.ts
@@ -7,6 +7,7 @@ import { Inject, Injectable } from '@nestjs/common';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import type { UsersRepository, UserProfilesRepository } from '@/models/_.js';
 import { DI } from '@/di-symbols.js';
+import { CacheService } from '@/core/CacheService.js';
 
 export const meta = {
 	tags: ['admin'],
@@ -28,10 +29,12 @@ export const paramDef = {
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
 		@Inject(DI.usersRepository)
-		private usersRepository: UsersRepository,
+		private readonly usersRepository: UsersRepository,
 
 		@Inject(DI.userProfilesRepository)
-		private userProfilesRepository: UserProfilesRepository,
+		private readonly userProfilesRepository: UserProfilesRepository,
+
+		private readonly cacheService: CacheService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const user = await this.usersRepository.findOneBy({ id: ps.userId });
@@ -43,6 +46,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			await this.userProfilesRepository.update(user.id, {
 				alwaysMarkNsfw: true,
 			});
+
+			await this.cacheService.userProfileCache.refresh(ps.userId);
 		});
 	}
 }
diff --git a/packages/backend/src/types.ts b/packages/backend/src/types.ts
index 067481d9da..b359fa5a39 100644
--- a/packages/backend/src/types.ts
+++ b/packages/backend/src/types.ts
@@ -100,6 +100,7 @@ export const moderationLogTypes = [
 	'deleteGlobalAnnouncement',
 	'deleteUserAnnouncement',
 	'resetPassword',
+	'setMandatoryCW',
 	'setRemoteInstanceNSFW',
 	'unsetRemoteInstanceNSFW',
 	'suspendRemoteInstance',
@@ -261,6 +262,13 @@ export type ModerationLogPayloads = {
 		userUsername: string;
 		userHost: string | null;
 	};
+	setMandatoryCW: {
+		newCW: string | null;
+		oldCW: string | null;
+		userId: string;
+		userUsername: string;
+		userHost: string | null;
+	};
 	setRemoteInstanceNSFW: {
 		id: string;
 		host: string;
diff --git a/packages/backend/test/unit/activitypub.ts b/packages/backend/test/unit/activitypub.ts
index 73d6186edf..435dbb5bea 100644
--- a/packages/backend/test/unit/activitypub.ts
+++ b/packages/backend/test/unit/activitypub.ts
@@ -3,6 +3,8 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+import { IdService } from '@/core/IdService.js';
+
 process.env.NODE_ENV = 'test';
 
 import * as assert from 'assert';
@@ -20,7 +22,7 @@ import { CoreModule } from '@/core/CoreModule.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
 import { LoggerService } from '@/core/LoggerService.js';
 import type { IActor, IApDocument, ICollection, IObject, IPost } from '@/core/activitypub/type.js';
-import { MiMeta, MiNote, UserProfilesRepository } from '@/models/_.js';
+import { MiMeta, MiNote, MiUser, UserProfilesRepository } from '@/models/_.js';
 import { DI } from '@/di-symbols.js';
 import { secureRndstr } from '@/misc/secure-rndstr.js';
 import { DownloadService } from '@/core/DownloadService.js';
@@ -93,6 +95,7 @@ describe('ActivityPub', () => {
 	let rendererService: ApRendererService;
 	let jsonLdService: JsonLdService;
 	let resolver: MockResolver;
+	let idService: IdService;
 
 	const metaInitial = {
 		cacheRemoteFiles: true,
@@ -140,6 +143,7 @@ describe('ActivityPub', () => {
 		imageService = app.get<ApImageService>(ApImageService);
 		jsonLdService = app.get<JsonLdService>(JsonLdService);
 		resolver = new MockResolver(await app.resolve<LoggerService>(LoggerService));
+		idService = app.get<IdService>(IdService);
 
 		// Prevent ApPersonService from fetching instance, as it causes Jest import-after-test error
 		const federatedInstanceService = app.get<FederatedInstanceService>(FederatedInstanceService);
@@ -477,4 +481,143 @@ describe('ActivityPub', () => {
 			});
 		});
 	});
+
+	describe(ApRendererService, () => {
+		let note: MiNote;
+		let author: MiUser;
+
+		beforeEach(() => {
+			author = new MiUser({
+				id: idService.gen(),
+			});
+			note = new MiNote({
+				id: idService.gen(),
+				userId: author.id,
+				visibility: 'public',
+				localOnly: false,
+				text: 'Note text',
+				cw: null,
+				renoteCount: 0,
+				repliesCount: 0,
+				clippedCount: 0,
+				reactions: {},
+				fileIds: [],
+				attachedFileTypes: [],
+				visibleUserIds: [],
+				mentions: [],
+				// This is fucked tbh - it's JSON stored in a TEXT column that gets parsed/serialized all over the place
+				mentionedRemoteUsers: '[]',
+				reactionAndUserPairCache: [],
+				emojis: [],
+				tags: [],
+				hasPoll: false,
+			});
+		});
+
+		describe('renderNote', () => {
+			describe('summary', () => {
+				// I actually don't know why it does this, but the logic was already there so I've preserved it.
+				it('should be zero-width space when CW is empty string', async () => {
+					note.cw = '';
+
+					const result = await rendererService.renderNote(note, author, false);
+
+					expect(result.summary).toBe(String.fromCharCode(0x200B));
+				});
+
+				it('should be undefined when CW is null', async () => {
+					const result = await rendererService.renderNote(note, author, false);
+
+					expect(result.summary).toBeUndefined();
+				});
+
+				it('should be CW when present without mandatoryCW', async () => {
+					note.cw = 'original';
+
+					const result = await rendererService.renderNote(note, author, false);
+
+					expect(result.summary).toBe('original');
+				});
+
+				it('should be mandatoryCW when present without CW', async () => {
+					author.mandatoryCW = 'mandatory';
+
+					const result = await rendererService.renderNote(note, author, false);
+
+					expect(result.summary).toBe('mandatory');
+				});
+
+				it('should be merged when CW and mandatoryCW are both present', async () => {
+					note.cw = 'original';
+					author.mandatoryCW = 'mandatory';
+
+					const result = await rendererService.renderNote(note, author, false);
+
+					expect(result.summary).toBe('original, mandatory');
+				});
+
+				it('should be CW when CW includes mandatoryCW', async () => {
+					note.cw = 'original and mandatory';
+					author.mandatoryCW = 'mandatory';
+
+					const result = await rendererService.renderNote(note, author, false);
+
+					expect(result.summary).toBe('original and mandatory');
+				});
+			});
+		});
+
+		describe('renderUpnote', () => {
+			describe('summary', () => {
+				// I actually don't know why it does this, but the logic was already there so I've preserved it.
+				it('should be zero-width space when CW is empty string', async () => {
+					note.cw = '';
+
+					const result = await rendererService.renderUpNote(note, author, false);
+
+					expect(result.summary).toBe(String.fromCharCode(0x200B));
+				});
+
+				it('should be undefined when CW is null', async () => {
+					const result = await rendererService.renderUpNote(note, author, false);
+
+					expect(result.summary).toBeUndefined();
+				});
+
+				it('should be CW when present without mandatoryCW', async () => {
+					note.cw = 'original';
+
+					const result = await rendererService.renderUpNote(note, author, false);
+
+					expect(result.summary).toBe('original');
+				});
+
+				it('should be mandatoryCW when present without CW', async () => {
+					author.mandatoryCW = 'mandatory';
+
+					const result = await rendererService.renderUpNote(note, author, false);
+
+					expect(result.summary).toBe('mandatory');
+				});
+
+				it('should be merged when CW and mandatoryCW are both present', async () => {
+					note.cw = 'original';
+					author.mandatoryCW = 'mandatory';
+
+					const result = await rendererService.renderUpNote(note, author, false);
+
+					expect(result.summary).toBe('original, mandatory');
+				});
+
+				it('should be CW when CW includes mandatoryCW', async () => {
+					note.cw = 'original and mandatory';
+					author.mandatoryCW = 'mandatory';
+
+					const result = await rendererService.renderUpNote(note, author, false);
+
+					expect(result.summary).toBe('original and mandatory');
+				});
+			});
+		});
+	});
 });
diff --git a/packages/backend/test/unit/misc/append-content-warning.ts b/packages/backend/test/unit/misc/append-content-warning.ts
new file mode 100644
index 0000000000..d25d7c4925
--- /dev/null
+++ b/packages/backend/test/unit/misc/append-content-warning.ts
@@ -0,0 +1,92 @@
+/*
+ * SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { appendContentWarning } from '@/misc/append-content-warning.js';
+
+describe(appendContentWarning, () => {
+	it('should return additional when original is null', () => {
+		const result = appendContentWarning(null, 'additional');
+
+		expect(result).toBe('additional');
+	});
+
+	it('should return additional when original is undefined', () => {
+		const result = appendContentWarning(undefined, 'additional');
+
+		expect(result).toBe('additional');
+	});
+
+	it('should return additional when original is empty', () => {
+		const result = appendContentWarning('', 'additional');
+
+		expect(result).toBe('additional');
+	});
+
+	it('should return original when additional is empty', () => {
+		const result = appendContentWarning('original', '');
+
+		expect(result).toBe('original');
+	});
+
+	it('should append additional when it does not exist in original', () => {
+		const result = appendContentWarning('original', 'additional');
+
+		expect(result).toBe('original, additional');
+	});
+
+	it('should append additional when it exists in original but has preceeding word', () => {
+		const result = appendContentWarning('notadditional', 'additional');
+
+		expect(result).toBe('notadditional, additional');
+	});
+
+	it('should append additional when it exists in original but has following word', () => {
+		const result = appendContentWarning('additionalnot', 'additional');
+
+		expect(result).toBe('additionalnot, additional');
+	});
+
+	it('should append additional when it exists in original multiple times but has preceeding or following word', () => {
+		const result = appendContentWarning('notadditional additionalnot', 'additional');
+
+		expect(result).toBe('notadditional additionalnot, additional');
+	});
+
+	it('should not append additional when it exists in original', () => {
+		const result = appendContentWarning('an additional word', 'additional');
+
+		expect(result).toBe('an additional word');
+	});
+
+	it('should not append additional when original starts with it', () => {
+		const result = appendContentWarning('additional word', 'additional');
+
+		expect(result).toBe('additional word');
+	});
+
+	it('should not append additional when original ends with it', () => {
+		const result = appendContentWarning('an additional', 'additional');
+
+		expect(result).toBe('an additional');
+	});
+
+	it('should not append additional when it appears multiple times', () => {
+		const result = appendContentWarning('an additional additional word', 'additional');
+
+		expect(result).toBe('an additional additional word');
+	});
+
+	it('should not append additional when it appears multiple times but some have preceeding or following', () => {
+		const result = appendContentWarning('a notadditional additional additionalnot word', 'additional');
+
+		expect(result).toBe('a notadditional additional additionalnot word');
+	});
+
+	it('should prepend additional when reverse is true', () => {
+		const result = appendContentWarning('original', 'additional', true);
+
+		expect(result).toBe('additional, original');
+	});
+});
diff --git a/packages/frontend-embed/src/components/EmNote.vue b/packages/frontend-embed/src/components/EmNote.vue
index 025c4c0734..bf96c557ea 100644
--- a/packages/frontend-embed/src/components/EmNote.vue
+++ b/packages/frontend-embed/src/components/EmNote.vue
@@ -46,11 +46,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<EmNoteHeader :note="appearNote" :mini="true"/>
 			<EmInstanceTicker v-if="appearNote.user.instance != null" :instance="appearNote.user.instance"/>
 			<div style="container-type: inline-size;">
-				<p v-if="appearNote.cw != null" :class="$style.cw">
-					<EmMfm v-if="appearNote.cw != ''" style="margin-right: 8px;" :text="appearNote.cw" :author="appearNote.user" :nyaize="'respect'" :isBlock="true"/>
+				<p v-if="mergedCW != null" :class="$style.cw">
+					<EmMfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :author="appearNote.user" :nyaize="'respect'" :isBlock="true"/>
 					<button style="display: block; width: 100%; margin: 4px 0;" class="_buttonGray _buttonRounded" @click="showContent = !showContent">{{ showContent ? i18n.ts._cw.hide : i18n.ts._cw.show }}</button>
 				</p>
-				<div v-show="appearNote.cw == null || showContent" :class="[{ [$style.contentCollapsed]: collapsed }]">
+				<div v-show="mergedCW == null || showContent" :class="[{ [$style.contentCollapsed]: collapsed }]">
 					<div :class="$style.text">
 						<span v-if="appearNote.isHidden" style="opacity: 0.5">({{ i18n.ts.private }})</span>
 						<EmA v-if="appearNote.replyId" :class="$style.replyIcon" :to="`/notes/${appearNote.replyId}`"><i class="ti ti-arrow-back-up"></i></EmA>
@@ -109,6 +109,7 @@ import * as mfm from '@transfem-org/sfm-js';
 import * as Misskey from 'misskey-js';
 import { shouldCollapsed } from '@@/js/collapsed.js';
 import { url } from '@@/js/config.js';
+import { computeMergedCw } from '@@/js/compute-merged-cw.js';
 import I18n from '@/components/I18n.vue';
 import EmNoteSub from '@/components/EmNoteSub.vue';
 import EmNoteHeader from '@/components/EmNoteHeader.vue';
@@ -154,6 +155,8 @@ const parsed = computed(() => appearNote.value.text ? mfm.parse(appearNote.value
 const isLong = shouldCollapsed(appearNote.value, []);
 const collapsed = ref(appearNote.value.cw == null && isLong);
 const isDeleted = ref(false);
+
+const mergedCW = computed(() => computeMergedCw(appearNote.value));
 </script>
 
 <style lang="scss" module>
diff --git a/packages/frontend-embed/src/components/EmNoteDetailed.vue b/packages/frontend-embed/src/components/EmNoteDetailed.vue
index c4ea9b4f2e..0961b36e35 100644
--- a/packages/frontend-embed/src/components/EmNoteDetailed.vue
+++ b/packages/frontend-embed/src/components/EmNoteDetailed.vue
@@ -58,11 +58,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</div>
 		</header>
 		<div :class="[$style.noteContent, { [$style.contentCollapsed]: collapsed }]">
-			<p v-if="appearNote.cw != null" :class="$style.cw">
-				<EmMfm v-if="appearNote.cw != ''" style="margin-right: 8px;" :text="appearNote.cw" :author="appearNote.user" :nyaize="'respect'" :isBlock="true"/>
+			<p v-if="mergedCW != null" :class="$style.cw">
+				<EmMfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :author="appearNote.user" :nyaize="'respect'" :isBlock="true"/>
 				<button style="display: block; width: 100%; margin: 4px 0;" class="_buttonGray _buttonRounded" @click="showContent = !showContent">{{ showContent ? i18n.ts._cw.hide : i18n.ts._cw.show }}</button>
 			</p>
-			<div v-show="appearNote.cw == null || showContent">
+			<div v-show="mergedCW == null || showContent">
 				<span v-if="appearNote.isHidden" style="opacity: 0.5">({{ i18n.ts.private }})</span>
 				<EmA v-if="appearNote.replyId" :class="$style.noteReplyTarget" :to="`/notes/${appearNote.replyId}`"><i class="ti ti-arrow-back-up"></i></EmA>
 				<EmMfm
@@ -130,6 +130,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 import { computed, inject, ref } from 'vue';
 import * as mfm from '@transfem-org/sfm-js';
 import * as Misskey from 'misskey-js';
+import { computeMergedCw } from '@@/js/compute-merged-cw.js';
 import I18n from '@/components/I18n.vue';
 import EmMediaList from '@/components/EmMediaList.vue';
 import EmNoteSub from '@/components/EmNoteSub.vue';
@@ -175,6 +176,8 @@ const isDeleted = ref(false);
 const parsed = appearNote.value.text ? mfm.parse(appearNote.value.text) : null;
 const isLong = shouldCollapsed(appearNote.value, []);
 const collapsed = ref(appearNote.value.cw == null && isLong);
+
+const mergedCW = computed(() => computeMergedCw(appearNote.value));
 </script>
 
 <style lang="scss" module>
diff --git a/packages/frontend-embed/src/components/EmNoteSimple.vue b/packages/frontend-embed/src/components/EmNoteSimple.vue
index 83e73f9870..688758edb6 100644
--- a/packages/frontend-embed/src/components/EmNoteSimple.vue
+++ b/packages/frontend-embed/src/components/EmNoteSimple.vue
@@ -9,11 +9,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<div :class="$style.main">
 		<EmNoteHeader :class="$style.header" :note="note" :mini="true"/>
 		<div>
-			<p v-if="note.cw != null" :class="$style.cw">
-				<EmMfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis" :isBlock="true"/>
+			<p v-if="mergedCW != null" :class="$style.cw">
+				<EmMfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis" :isBlock="true"/>
 				<button style="display: block; width: 100%;" class="_buttonGray _buttonRounded" @click="showContent = !showContent">{{ showContent ? i18n.ts._cw.hide : i18n.ts._cw.show }}</button>
 			</p>
-			<div v-show="note.cw == null || showContent">
+			<div v-show="mergedCW == null || showContent">
 				<EmSubNoteContent :class="$style.text" :note="note"/>
 			</div>
 		</div>
@@ -22,8 +22,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { ref } from 'vue';
+import { computed, ref } from 'vue';
 import * as Misskey from 'misskey-js';
+import { computeMergedCw } from '@@/js/compute-merged-cw.js';
 import { i18n } from '@/i18n.js';
 import EmAvatar from '@/components/EmAvatar.vue';
 import EmNoteHeader from '@/components/EmNoteHeader.vue';
@@ -35,6 +36,8 @@ const props = defineProps<{
 }>();
 
 const showContent = ref(false);
+
+const mergedCW = computed(() => computeMergedCw(props.note));
 </script>
 
 <style lang="scss" module>
diff --git a/packages/frontend-embed/src/components/EmNoteSub.vue b/packages/frontend-embed/src/components/EmNoteSub.vue
index cc379e8281..629f0bffcd 100644
--- a/packages/frontend-embed/src/components/EmNoteSub.vue
+++ b/packages/frontend-embed/src/components/EmNoteSub.vue
@@ -11,11 +11,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<div :class="$style.body">
 			<EmNoteHeader :class="$style.header" :note="note" :mini="true"/>
 			<div>
-				<p v-if="note.cw != null" :class="$style.cw">
-					<EmMfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :author="note.user" :nyaize="'respect'" :isBlock="true"/>
+				<p v-if="mergedCW != null" :class="$style.cw">
+					<EmMfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :author="note.user" :nyaize="'respect'" :isBlock="true"/>
 					<button style="display: block; width: 100%;" class="_buttonGray _buttonRounded" @click="showContent = !showContent">{{ showContent ? i18n.ts._cw.hide : i18n.ts._cw.show }}</button>
 				</p>
-				<div v-show="note.cw == null || showContent">
+				<div v-show="mergedCW == null || showContent">
 					<EmSubNoteContent :class="$style.text" :note="note"/>
 				</div>
 			</div>
@@ -31,8 +31,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { ref } from 'vue';
+import { computed, ref } from 'vue';
 import * as Misskey from 'misskey-js';
+import { computeMergedCw } from '@@/js/compute-merged-cw.js';
 import EmA from '@/components/EmA.vue';
 import EmAvatar from '@/components/EmAvatar.vue';
 import EmNoteHeader from '@/components/EmNoteHeader.vue';
@@ -55,6 +56,8 @@ const props = withDefaults(defineProps<{
 const showContent = ref(false);
 const replies = ref<Misskey.entities.Note[]>([]);
 
+const mergedCW = computed(() => computeMergedCw(props.note));
+
 if (props.detail) {
 	misskeyApi('notes/children', {
 		noteId: props.note.id,
diff --git a/packages/frontend-shared/js/append-content-warning.ts b/packages/frontend-shared/js/append-content-warning.ts
new file mode 100644
index 0000000000..7f24a66f23
--- /dev/null
+++ b/packages/frontend-shared/js/append-content-warning.ts
@@ -0,0 +1,62 @@
+/*
+ * SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/*
+ * Important Note: this file must be kept in sync with packages/backend/src/misc/append-content-warning.ts
+ */
+
+/**
+ * Appends an additional content warning onto an existing one.
+ * The additional value will not be added if it already exists within the original input.
+ * @param original Existing content warning
+ * @param additional Content warning to append
+ * @param reverse If true, then the additional CW will be prepended instead of appended.
+ */
+export function appendContentWarning(original: string | null | undefined, additional: string, reverse = false): string {
+	// Easy case - if original is empty, then additional replaces it.
+	if (!original) {
+		return additional;
+	}
+
+	// Easy case - if the additional CW is empty, then don't append it.
+	if (!additional) {
+		return original;
+	}
+
+	// If the additional CW already exists in the input, then we *don't* append another copy!
+	if (includesWholeWord(original, additional)) {
+		return original;
+	}
+
+	return reverse
+		? `${additional}, ${original}`
+		: `${original}, ${additional}`;
+}
+
+/**
+ * Emulates a regular expression like /\b(pattern)\b/, but with a raw non-regex pattern.
+ * We're checking to see whether the default CW appears inside the existing CW, but *only* if there's word boundaries on either side.
+ * @param input Input string to search
+ * @param target Target word / phrase to search for
+ */
+function includesWholeWord(input: string, target: string): boolean {
+	const parts = input.split(target);
+
+	// The additional string could appear multiple times within the original input.
+	// We need to check each occurrence, since any of them could potentially match.
+	for (let i = 0; i + 1 < parts.length; i++) {
+		const before = parts[i];
+		const after = parts[i + 1];
+
+		// If either the preceding or following tokens are a "word", then this "match" is actually just part of a longer word.
+		// Likewise, if *neither* token is a word, then this is a real match and the CW already exists in the input.
+		if (!/\w$/.test(before) && !/^\w/.test(after)) {
+			return true;
+		}
+	}
+
+	// If we don't match, then there is no existing CW.
+	return false;
+}
diff --git a/packages/frontend-shared/js/compute-merged-cw.ts b/packages/frontend-shared/js/compute-merged-cw.ts
new file mode 100644
index 0000000000..dfea57fdce
--- /dev/null
+++ b/packages/frontend-shared/js/compute-merged-cw.ts
@@ -0,0 +1,17 @@
+/*
+ * SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import * as Misskey from 'misskey-js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
+
+export function computeMergedCw(note: Misskey.entities.Note): string | null {
+	let cw = note.cw;
+
+	if (note.user.mandatoryCW) {
+		cw = appendContentWarning(cw, note.user.mandatoryCW);
+	}
+
+	return cw ?? null;
+}
diff --git a/packages/frontend/src/components/MkNote.vue b/packages/frontend/src/components/MkNote.vue
index 9271e9e4b7..0bac6a67b9 100644
--- a/packages/frontend/src/components/MkNote.vue
+++ b/packages/frontend/src/components/MkNote.vue
@@ -59,10 +59,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<MkInstanceTicker v-if="showTicker" :host="appearNote.user.host" :instance="appearNote.user.instance"/>
 			<div style="container-type: inline-size;">
 				<bdi>
-				<p v-if="appearNote.cw != null" :class="$style.cw">
+				<p v-if="mergedCW != null" :class="$style.cw">
 					<Mfm
-						v-if="appearNote.cw != ''"
-						:text="appearNote.cw"
+						v-if="mergedCW != ''"
+						:text="mergedCW"
 						:author="appearNote.user"
 						:nyaize="'respect'"
 						:enableEmojiMenu="true"
@@ -71,7 +71,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					/>
 					<MkCwButton v-model="showContent" :text="appearNote.text" :renote="appearNote.renote" :files="appearNote.files" :poll="appearNote.poll" style="margin: 4px 0;" @click.stop/>
 				</p>
-				<div v-show="appearNote.cw == null || showContent" :class="[{ [$style.contentCollapsed]: collapsed }]">
+				<div v-show="mergedCW == null || showContent" :class="[{ [$style.contentCollapsed]: collapsed }]">
 					<div :class="$style.text">
 						<span v-if="appearNote.isHidden" style="opacity: 0.5">({{ i18n.ts.private }})</span>
 						<MkA v-if="appearNote.replyId" :class="$style.replyIcon" :to="`/notes/${appearNote.replyId}`"><i class="ph-arrow-bend-left-up ph-bold ph-lg"></i></MkA>
@@ -212,6 +212,7 @@ import * as Misskey from 'misskey-js';
 import { isLink } from '@@/js/is-link.js';
 import { shouldCollapsed } from '@@/js/collapsed.js';
 import { host } from '@@/js/config.js';
+import { computeMergedCw } from '@@/js/compute-merged-cw.js';
 import type { MenuItem } from '@/types/menu.js';
 import MkNoteSub from '@/components/MkNoteSub.vue';
 import MkNoteHeader from '@/components/MkNoteHeader.vue';
@@ -350,6 +351,8 @@ const pleaseLoginContext = computed<OpenOnRemoteOptions>(() => ({
 	url: `https://${host}/notes/${appearNote.value.id}`,
 }));
 
+const mergedCW = computed(() => computeMergedCw(appearNote.value));
+
 const renoteTooltip = computeRenoteTooltip(renoted);
 
 /* Overload FunctionにLintが対応していないのでコメントアウト
diff --git a/packages/frontend/src/components/MkNoteDetailed.vue b/packages/frontend/src/components/MkNoteDetailed.vue
index 6c52714f46..582838ebca 100644
--- a/packages/frontend/src/components/MkNoteDetailed.vue
+++ b/packages/frontend/src/components/MkNoteDetailed.vue
@@ -75,10 +75,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</div>
 		</header>
 		<div :class="$style.noteContent">
-			<p v-if="appearNote.cw != null" :class="$style.cw">
+			<p v-if="mergedCW != null" :class="$style.cw">
 				<Mfm
-					v-if="appearNote.cw != ''"
-					:text="appearNote.cw"
+					v-if="mergedCW != ''"
+					:text="mergedCW"
 					:author="appearNote.user"
 					:nyaize="'respect'"
 					:enableEmojiMenu="true"
@@ -87,7 +87,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				/>
 				<MkCwButton v-model="showContent" :text="appearNote.text" :renote="appearNote.renote" :files="appearNote.files" :poll="appearNote.poll"/>
 			</p>
-			<div v-show="appearNote.cw == null || showContent">
+			<div v-show="mergedCW == null || showContent">
 				<span v-if="appearNote.isHidden" style="opacity: 0.5">({{ i18n.ts.private }})</span>
 				<MkA v-if="appearNote.replyId" :class="$style.noteReplyTarget" :to="`/notes/${appearNote.replyId}`"><i class="ph-arrow-bend-left-up ph-bold ph-lg"></i></MkA>
 				<Mfm
@@ -245,6 +245,7 @@ import * as mfm from '@transfem-org/sfm-js';
 import * as Misskey from 'misskey-js';
 import { isLink } from '@@/js/is-link.js';
 import { host } from '@@/js/config.js';
+import { computeMergedCw } from '@@/js/compute-merged-cw.js';
 import MkNoteSub from '@/components/MkNoteSub.vue';
 import MkNoteSimple from '@/components/MkNoteSimple.vue';
 import MkReactionsViewer from '@/components/MkReactionsViewer.vue';
@@ -348,6 +349,8 @@ const quotes = ref<Misskey.entities.Note[]>([]);
 const canRenote = computed(() => ['public', 'home'].includes(appearNote.value.visibility) || (appearNote.value.visibility === 'followers' && appearNote.value.userId === $i?.id));
 const defaultLike = computed(() => defaultStore.state.like ? defaultStore.state.like : null);
 
+const mergedCW = computed(() => computeMergedCw(appearNote.value));
+
 const renoteTooltip = computeRenoteTooltip(renoted);
 
 watch(() => props.expandAllCws, (expandAllCws) => {
diff --git a/packages/frontend/src/components/MkNoteSimple.vue b/packages/frontend/src/components/MkNoteSimple.vue
index 9ef45a0ec3..3720aa7493 100644
--- a/packages/frontend/src/components/MkNoteSimple.vue
+++ b/packages/frontend/src/components/MkNoteSimple.vue
@@ -9,11 +9,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<div :class="$style.main">
 		<MkNoteHeader :class="$style.header" :note="note" :mini="true"/>
 		<div>
-			<p v-if="note.cw != null" :class="$style.cw">
-				<Mfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :isBlock="true" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis"/>
+			<p v-if="mergedCW != null" :class="$style.cw">
+				<Mfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :isBlock="true" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis"/>
 				<MkCwButton v-model="showContent" :text="note.text" :files="note.files" :poll="note.poll" @click.stop/>
 			</p>
-			<div v-show="note.cw == null || showContent">
+			<div v-show="mergedCW == null || showContent">
 				<MkSubNoteContent :hideFiles="hideFiles" :class="$style.text" :note="note" :expandAllCws="props.expandAllCws"/>
 				<div v-if="note.isSchedule" style="margin-top: 10px;">
 					<MkButton :class="$style.button" inline @click.stop.prevent="editScheduleNote()"><i class="ti ti-eraser"></i> {{ i18n.ts.edit }}</MkButton>
@@ -26,8 +26,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { ref, watch } from 'vue';
+import { computed, ref, watch } from 'vue';
 import * as Misskey from 'misskey-js';
+import { computeMergedCw } from '@@/js/compute-merged-cw.js';
 import * as os from '@/os.js';
 import MkNoteHeader from '@/components/MkNoteHeader.vue';
 import MkSubNoteContent from '@/components/MkSubNoteContent.vue';
@@ -48,6 +49,8 @@ const props = defineProps<{
 let showContent = ref(defaultStore.state.uncollapseCW);
 const isDeleted = ref(false);
 
+const mergedCW = computed(() => computeMergedCw(props.note));
+
 const emit = defineEmits<{
 	(ev: 'editScheduleNote'): void;
 }>();
diff --git a/packages/frontend/src/components/MkNoteSub.vue b/packages/frontend/src/components/MkNoteSub.vue
index 9febc1219c..61006cfdcc 100644
--- a/packages/frontend/src/components/MkNoteSub.vue
+++ b/packages/frontend/src/components/MkNoteSub.vue
@@ -11,11 +11,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<div :class="$style.body">
 			<MkNoteHeader :class="$style.header" :note="note" :mini="true"/>
 			<div :class="$style.content">
-				<p v-if="note.cw != null" :class="$style.cw">
-					<Mfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :isBlock="true" :author="note.user" :nyaize="'respect'"/>
+				<p v-if="mergedCW != null" :class="$style.cw">
+					<Mfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :isBlock="true" :author="note.user" :nyaize="'respect'"/>
 					<MkCwButton v-model="showContent" :text="note.text" :files="note.files" :poll="note.poll"/>
 				</p>
-				<div v-show="note.cw == null || showContent">
+				<div v-show="mergedCW == null || showContent">
 					<MkSubNoteContent :class="$style.text" :note="note" :translating="translating" :translation="translation" :expandAllCws="props.expandAllCws"/>
 				</div>
 			</div>
@@ -86,6 +86,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { computed, ref, shallowRef, watch } from 'vue';
 import * as Misskey from 'misskey-js';
+import { computeMergedCw } from '@@/js/compute-merged-cw.js';
 import MkNoteHeader from '@/components/MkNoteHeader.vue';
 import MkReactionsViewer from '@/components/MkReactionsViewer.vue';
 import MkSubNoteContent from '@/components/MkSubNoteContent.vue';
@@ -142,6 +143,8 @@ let appearNote = computed(() => isRenote ? props.note.renote as Misskey.entities
 const defaultLike = computed(() => defaultStore.state.like ? defaultStore.state.like : null);
 const replies = ref<Misskey.entities.Note[]>([]);
 
+const mergedCW = computed(() => computeMergedCw(appearNote.value));
+
 const isRenote = (
 	props.note.renote != null &&
 	props.note.text == null &&
diff --git a/packages/frontend/src/components/MkPostForm.vue b/packages/frontend/src/components/MkPostForm.vue
index 059de8011c..c5f5f4514d 100644
--- a/packages/frontend/src/components/MkPostForm.vue
+++ b/packages/frontend/src/components/MkPostForm.vue
@@ -112,6 +112,7 @@ import * as Misskey from 'misskey-js';
 import insertTextAtCursor from 'insert-text-at-cursor';
 import { toASCII } from 'punycode.js';
 import { host, url } from '@@/js/config.js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
 import type { MenuItem } from '@/types/menu.js';
 import type { PostFormProps } from '@/types/post-form.js';
 import MkNoteSimple from '@/components/MkNoteSimple.vue';
@@ -373,18 +374,8 @@ if ($i.defaultCW) {
 	if (!cw.value || $i.defaultCWPriority === 'default') {
 		cw.value = $i.defaultCW;
 	} else if ($i.defaultCWPriority !== 'parent') {
-		// This is a fancy way of simulating /\bsearch\b/ without a regular expression.
-		// We're checking to see whether the default CW appears inside the existing CW, but *only* if there's word boundaries.
-		const parts = cw.value.split($i.defaultCW);
-		const hasExistingDefaultCW = parts.length === 2 && !/\w$/.test(parts[0]) && !/^\w/.test(parts[1]);
-		if (!hasExistingDefaultCW) {
-			// We need to merge the CWs
-			if ($i.defaultCWPriority === 'defaultParent') {
-				cw.value = `${$i.defaultCW}, ${cw.value}`;
-			} else if ($i.defaultCWPriority === 'parentDefault') {
-				cw.value = `${cw.value}, ${$i.defaultCW}`;
-			}
-		}
+		const putDefaultFirst = $i.defaultCWPriority === 'defaultParent';
+		cw.value = appendContentWarning(cw.value, $i.defaultCW, putDefaultFirst);
 	}
 	// else { do nothing, because existing CW takes priority. }
 }
diff --git a/packages/frontend/src/components/SkNote.vue b/packages/frontend/src/components/SkNote.vue
index 323ca283bf..777e95593d 100644
--- a/packages/frontend/src/components/SkNote.vue
+++ b/packages/frontend/src/components/SkNote.vue
@@ -62,10 +62,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</div>
 		<div :class="[{ [$style.clickToOpen]: defaultStore.state.clickToOpen }]" @click.stop="defaultStore.state.clickToOpen ? noteclick(appearNote.id) : undefined">
 			<div style="container-type: inline-size;">
-				<p v-if="appearNote.cw != null" :class="$style.cw">
+				<p v-if="mergedCW != null" :class="$style.cw">
 					<Mfm
-						v-if="appearNote.cw != ''"
-						:text="appearNote.cw"
+						v-if="mergedCW != ''"
+						:text="mergedCW"
 						:author="appearNote.user"
 						:nyaize="'respect'"
 						:enableEmojiMenu="true"
@@ -74,7 +74,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					/>
 					<MkCwButton v-model="showContent" :text="appearNote.text" :renote="appearNote.renote" :files="appearNote.files" :poll="appearNote.poll" style="margin: 4px 0;" @click.stop/>
 				</p>
-				<div v-show="appearNote.cw == null || showContent" :class="[{ [$style.contentCollapsed]: collapsed }]">
+				<div v-show="mergedCW == null || showContent" :class="[{ [$style.contentCollapsed]: collapsed }]">
 					<div :class="$style.text">
 						<span v-if="appearNote.isHidden" style="opacity: 0.5">({{ i18n.ts.private }})</span>
 						<Mfm
@@ -213,6 +213,7 @@ import * as Misskey from 'misskey-js';
 import { isLink } from '@@/js/is-link.js';
 import { shouldCollapsed } from '@@/js/collapsed.js';
 import { host } from '@@/js/config.js';
+import { computeMergedCw } from '@@/js/compute-merged-cw.js';
 import type { MenuItem } from '@/types/menu.js';
 import SkNoteSub from '@/components/SkNoteSub.vue';
 import SkNoteHeader from '@/components/SkNoteHeader.vue';
@@ -345,6 +346,8 @@ const defaultLike = computed(() => defaultStore.state.like ? defaultStore.state.
 const animated = computed(() => parsed.value ? checkAnimationFromMfm(parsed.value) : null);
 const allowAnim = ref(defaultStore.state.advancedMfm && defaultStore.state.animatedMfm ? true : false);
 
+const mergedCW = computed(() => computeMergedCw(appearNote.value));
+
 const renoteTooltip = computeRenoteTooltip(renoted);
 
 const pleaseLoginContext = computed<OpenOnRemoteOptions>(() => ({
diff --git a/packages/frontend/src/components/SkNoteDetailed.vue b/packages/frontend/src/components/SkNoteDetailed.vue
index dc8a5f59b2..471a4ce7d7 100644
--- a/packages/frontend/src/components/SkNoteDetailed.vue
+++ b/packages/frontend/src/components/SkNoteDetailed.vue
@@ -81,10 +81,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</div>
 		</header>
 		<div :class="$style.noteContent">
-			<p v-if="appearNote.cw != null" :class="$style.cw">
+			<p v-if="mergedCW != null" :class="$style.cw">
 				<Mfm
-					v-if="appearNote.cw != ''"
-					:text="appearNote.cw"
+					v-if="mergedCW != ''"
+					:text="mergedCW"
 					:author="appearNote.user"
 					:nyaize="'respect'"
 					:enableEmojiMenu="true"
@@ -93,7 +93,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				/>
 				<MkCwButton v-model="showContent" :text="appearNote.text" :renote="appearNote.renote" :files="appearNote.files" :poll="appearNote.poll"/>
 			</p>
-			<div v-show="appearNote.cw == null || showContent">
+			<div v-show="mergedCW == null || showContent">
 				<span v-if="appearNote.isHidden" style="opacity: 0.5">({{ i18n.ts.private }})</span>
 				<Mfm
 					v-if="appearNote.text"
@@ -250,6 +250,7 @@ import * as mfm from '@transfem-org/sfm-js';
 import * as Misskey from 'misskey-js';
 import { isLink } from '@@/js/is-link.js';
 import { host } from '@@/js/config.js';
+import { computeMergedCw } from '@@/js/compute-merged-cw.js';
 import SkNoteSub from '@/components/SkNoteSub.vue';
 import SkNoteSimple from '@/components/SkNoteSimple.vue';
 import MkReactionsViewer from '@/components/MkReactionsViewer.vue';
@@ -354,6 +355,8 @@ const quotes = ref<Misskey.entities.Note[]>([]);
 const canRenote = computed(() => ['public', 'home'].includes(appearNote.value.visibility) || (appearNote.value.visibility === 'followers' && appearNote.value.userId === $i?.id));
 const defaultLike = computed(() => defaultStore.state.like ? defaultStore.state.like : null);
 
+const mergedCW = computed(() => computeMergedCw(appearNote.value));
+
 const renoteTooltip = computeRenoteTooltip(renoted);
 
 watch(() => props.expandAllCws, (expandAllCws) => {
diff --git a/packages/frontend/src/components/SkNoteSimple.vue b/packages/frontend/src/components/SkNoteSimple.vue
index b9895305f2..71a5bd4df8 100644
--- a/packages/frontend/src/components/SkNoteSimple.vue
+++ b/packages/frontend/src/components/SkNoteSimple.vue
@@ -9,11 +9,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<div :class="$style.main">
 		<MkNoteHeader :class="$style.header" :classic="true" :note="note" :mini="true"/>
 		<div>
-			<p v-if="note.cw != null" :class="$style.cw">
-				<Mfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :isBlock="true" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis"/>
+			<p v-if="mergedCW != null" :class="$style.cw">
+				<Mfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :isBlock="true" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis"/>
 				<MkCwButton v-model="showContent" :text="note.text" :files="note.files" :poll="note.poll" @click.stop/>
 			</p>
-			<div v-show="note.cw == null || showContent">
+			<div v-show="mergedCW == null || showContent">
 				<MkSubNoteContent :hideFiles="hideFiles" :class="$style.text" :note="note" :expandAllCws="props.expandAllCws"/>
 			</div>
 		</div>
@@ -22,8 +22,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { watch, ref } from 'vue';
+import { watch, ref, computed } from 'vue';
 import * as Misskey from 'misskey-js';
+import { computeMergedCw } from '@@/js/compute-merged-cw.js';
 import MkNoteHeader from '@/components/MkNoteHeader.vue';
 import MkSubNoteContent from '@/components/MkSubNoteContent.vue';
 import MkCwButton from '@/components/MkCwButton.vue';
@@ -37,6 +38,8 @@ const props = defineProps<{
 
 let showContent = ref(defaultStore.state.uncollapseCW);
 
+const mergedCW = computed(() => computeMergedCw(props.note));
+
 watch(() => props.expandAllCws, (expandAllCws) => {
 	if (expandAllCws !== showContent.value) showContent.value = expandAllCws;
 });
diff --git a/packages/frontend/src/components/SkNoteSub.vue b/packages/frontend/src/components/SkNoteSub.vue
index a3d27c9e16..060e66be16 100644
--- a/packages/frontend/src/components/SkNoteSub.vue
+++ b/packages/frontend/src/components/SkNoteSub.vue
@@ -19,11 +19,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<div :class="$style.body">
 			<SkNoteHeader :class="$style.header" :note="note" :classic="true" :mini="true"/>
 			<div :class="$style.content">
-				<p v-if="note.cw != null" :class="$style.cw">
-					<Mfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :isBlock="true" :author="note.user" :nyaize="'respect'"/>
+				<p v-if="mergedCW != null" :class="$style.cw">
+					<Mfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :isBlock="true" :author="note.user" :nyaize="'respect'"/>
 					<MkCwButton v-model="showContent" :text="note.text" :files="note.files" :poll="note.poll"/>
 				</p>
-				<div v-show="note.cw == null || showContent">
+				<div v-show="mergedCW == null || showContent">
 					<MkSubNoteContent :class="$style.text" :note="note" :translating="translating" :translation="translation" :expandAllCws="props.expandAllCws"/>
 				</div>
 			</div>
@@ -94,6 +94,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { computed, ref, shallowRef, watch } from 'vue';
 import * as Misskey from 'misskey-js';
+import { computeMergedCw } from '@@/js/compute-merged-cw.js';
 import SkNoteHeader from '@/components/SkNoteHeader.vue';
 import MkReactionsViewer from '@/components/MkReactionsViewer.vue';
 import MkSubNoteContent from '@/components/MkSubNoteContent.vue';
@@ -156,6 +157,8 @@ let appearNote = computed(() => isRenote ? props.note.renote as Misskey.entities
 const defaultLike = computed(() => defaultStore.state.like ? defaultStore.state.like : null);
 const replies = ref<Misskey.entities.Note[]>([]);
 
+const mergedCW = computed(() => computeMergedCw(appearNote.value));
+
 const isRenote = (
 	props.note.renote != null &&
 	props.note.text == null &&
diff --git a/packages/frontend/src/pages/admin-user.vue b/packages/frontend/src/pages/admin-user.vue
index 11a34d34ef..229f581672 100644
--- a/packages/frontend/src/pages/admin-user.vue
+++ b/packages/frontend/src/pages/admin-user.vue
@@ -53,7 +53,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					</MkKeyValue>
 				</div>
 
-				<MkTextarea v-model="moderationNote" manualSave>
+				<MkTextarea v-model="moderationNote" manualSave @update:modelValue="onModerationNoteChanged">
 					<template #label>{{ i18n.ts.moderationNote }}</template>
 					<template #caption>{{ i18n.ts.moderationNoteDescription }}</template>
 				</MkTextarea>
@@ -83,6 +83,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<MkSwitch v-if="!isSystem" v-model="suspended" @update:modelValue="toggleSuspend">{{ i18n.ts.suspend }}</MkSwitch>
 						<MkSwitch v-model="markedAsNSFW" @update:modelValue="toggleNSFW">{{ i18n.ts.markAsNSFW }}</MkSwitch>
 
+						<MkInput v-model="mandatoryCW" type="text" manualSave @update:modelValue="onMandatoryCWChanged">
+							<template #label>{{ i18n.ts.mandatoryCW }}</template>
+							<template #caption>{{ i18n.ts.mandatoryCWDescription }}</template>
+						</MkInput>
+
 						<div>
 							<MkButton v-if="user.host == null && !isSystem" inline style="margin-right: 8px;" @click="resetPassword"><i class="ti ti-key"></i> {{ i18n.ts.resetPassword }}</MkButton>
 						</div>
@@ -222,6 +227,7 @@ import { i18n } from '@/i18n.js';
 import { iAmAdmin, $i, iAmModerator } from '@/account.js';
 import MkRolePreview from '@/components/MkRolePreview.vue';
 import MkPagination from '@/components/MkPagination.vue';
+import MkInput from '@/components/MkInput.vue';
 
 const props = withDefaults(defineProps<{
 	userId: string;
@@ -243,6 +249,7 @@ const approved = ref(false);
 const suspended = ref(false);
 const markedAsNSFW = ref(false);
 const moderationNote = ref('');
+const mandatoryCW = ref<string | null>(null);
 const isSystem = computed(() => info.value?.isSystem ?? false);
 const filesPagination = {
 	endpoint: 'admin/drive/files' as const,
@@ -281,11 +288,7 @@ function createFetcher() {
 		markedAsNSFW.value = info.value.alwaysMarkNsfw;
 		suspended.value = info.value.isSuspended;
 		moderationNote.value = info.value.moderationNote;
-
-		watch(moderationNote, async () => {
-			await misskeyApi('admin/update-user-note', { userId: user.value.id, text: moderationNote.value });
-			await refreshUser();
-		});
+		mandatoryCW.value = user.value.mandatoryCW;
 	});
 }
 
@@ -293,6 +296,16 @@ function refreshUser() {
 	init.value = createFetcher();
 }
 
+async function onMandatoryCWChanged(value: string) {
+	await os.apiWithDialog('admin/cw-user', { userId: props.userId, cw: value });
+	refreshUser();
+}
+
+async function onModerationNoteChanged(value: string) {
+	await misskeyApi('admin/update-user-note', { userId: props.userId, text: value });
+	refreshUser();
+}
+
 async function updateRemoteUser() {
 	await os.apiWithDialog('federation/update-remote-user', { userId: user.value.id });
 	refreshUser();
diff --git a/packages/frontend/src/pages/admin/modlog.ModLog.vue b/packages/frontend/src/pages/admin/modlog.ModLog.vue
index 37a9cc83e7..741de875bc 100644
--- a/packages/frontend/src/pages/admin/modlog.ModLog.vue
+++ b/packages/frontend/src/pages/admin/modlog.ModLog.vue
@@ -22,6 +22,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				[$style.logYellow]: [
 					'markSensitiveDriveFile',
 					'resetPassword',
+					'setMandatoryCW',
 					'suspendRemoteInstance',
 					'setRemoteInstanceNSFW',
 					'unsetRemoteInstanceNSFW',
@@ -55,6 +56,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<span v-else-if="log.type === 'decline'">: @{{ log.info.userUsername }}{{ log.info.userHost ? '@' + log.info.userHost : '' }}</span>
 		<span v-else-if="log.type === 'unsuspend'">: @{{ log.info.userUsername }}{{ log.info.userHost ? '@' + log.info.userHost : '' }}</span>
 		<span v-else-if="log.type === 'resetPassword'">: @{{ log.info.userUsername }}{{ log.info.userHost ? '@' + log.info.userHost : '' }}</span>
+		<span v-else-if="log.type === 'setMandatoryCW'">: @{{ log.info.userUsername }}{{ log.info.userHost ? '@' + log.info.userHost : '' }}</span>
 		<span v-else-if="log.type === 'assignRole'">: @{{ log.info.userUsername }}{{ log.info.userHost ? '@' + log.info.userHost : '' }} <i class="ti ti-arrow-right"></i> {{ log.info.roleName }}</span>
 		<span v-else-if="log.type === 'unassignRole'">: @{{ log.info.userUsername }}{{ log.info.userHost ? '@' + log.info.userHost : '' }} <i class="ti ti-equal-not"></i> {{ log.info.roleName }}</span>
 		<span v-else-if="log.type === 'createRole'">: {{ log.info.role.name }}</span>
@@ -93,7 +95,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<span v-else-if="log.type === 'deleteFlash'">: @{{ log.info.flashUserUsername }}</span>
 		<span v-else-if="log.type === 'deleteGalleryPost'">: @{{ log.info.postUserUsername }}</span>
 	</template>
-	<template #icon>
+	<template v-if="log.user" #icon>
 		<MkAvatar :user="log.user" :class="$style.avatar"/>
 	</template>
 	<template #suffix>
@@ -123,6 +125,12 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<template v-else-if="log.type === 'approve'">
 			<div>{{ i18n.ts.user }}: <MkA :to="`/admin/user/${log.info.userId}`" class="_link">@{{ log.info.userUsername }}{{ log.info.userHost ? '@' + log.info.userHost : '' }}</MkA></div>
 		</template>
+		<template v-else-if="log.type === 'setMandatoryCW'">
+			<div>{{ i18n.ts.user }}: <MkA :to="`/admin/user/${log.info.userId}`" class="_link">@{{ log.info.userUsername }}{{ log.info.userHost ? '@' + log.info.userHost : '' }}</MkA></div>
+			<div :class="$style.diff">
+				<CodeDiff :context="0" :hideHeader="true" :oldString="log.info.oldCW ?? ''" :newString="log.info.newCW ?? ''" maxHeight="150px"/>
+			</div>
+		</template>
 		<template v-else-if="log.type === 'unsuspend'">
 			<div>{{ i18n.ts.user }}: <MkA :to="`/admin/user/${log.info.userId}`" class="_link">@{{ log.info.userUsername }}{{ log.info.userHost ? '@' + log.info.userHost : '' }}</MkA></div>
 		</template>
diff --git a/packages/frontend/src/scripts/get-note-summary.ts b/packages/frontend/src/scripts/get-note-summary.ts
index 58d486bf9b..4e093bcf4c 100644
--- a/packages/frontend/src/scripts/get-note-summary.ts
+++ b/packages/frontend/src/scripts/get-note-summary.ts
@@ -4,6 +4,7 @@
  */
 
 import * as Misskey from 'misskey-js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
 import { i18n } from '@/i18n.js';
 
 /**
@@ -25,9 +26,15 @@ export const getNoteSummary = (note?: Misskey.entities.Note | null): string => {
 
 	let summary = '';
 
+	// Append mandatory CW, if applicable
+	let cw = note.cw;
+	if (note.user.mandatoryCW) {
+		cw = appendContentWarning(cw, note.user.mandatoryCW);
+	}
+
 	// 本文
-	if (note.cw != null) {
-		summary += `CW: ${note.cw}`;
+	if (cw != null) {
+		summary += `CW: ${cw}`;
 	} else if (note.text) {
 		summary += note.text;
 	}
diff --git a/packages/misskey-js/etc/misskey-js.api.md b/packages/misskey-js/etc/misskey-js.api.md
index e564600ef1..cc3dcaa765 100644
--- a/packages/misskey-js/etc/misskey-js.api.md
+++ b/packages/misskey-js/etc/misskey-js.api.md
@@ -147,6 +147,9 @@ type AdminCaptchaCurrentResponse = operations['admin___captcha___current']['resp
 type AdminCaptchaSaveRequest = operations['admin___captcha___save']['requestBody']['content']['application/json'];
 
 // @public (undocumented)
+type AdminCwUserRequest = operations['admin___cw-user']['requestBody']['content']['application/json'];
+
+// @public (undocumented)
 type AdminDeclineUserRequest = operations['admin___decline-user']['requestBody']['content']['application/json'];
 
 // @public (undocumented)
@@ -1307,6 +1310,7 @@ declare namespace entities {
         AdminAvatarDecorationsUpdateRequest,
         AdminCaptchaCurrentResponse,
         AdminCaptchaSaveRequest,
+        AdminCwUserRequest,
         AdminDeclineUserRequest,
         AdminDeleteAccountRequest,
         AdminDeleteAllFilesOfAUserRequest,
@@ -2610,6 +2614,15 @@ type ModerationLog = {
     type: 'deleteUserAnnouncement';
     info: ModerationLogPayloads['deleteUserAnnouncement'];
 } | {
+    type: 'setMandatoryCW';
+    info: ModerationLogPayloads['setMandatoryCW'];
+} | {
+    type: 'setRemoteInstanceNSFW';
+    info: ModerationLogPayloads['setRemoteInstanceNSFW'];
+} | {
+    type: 'unsetRemoteInstanceNSFW';
+    info: ModerationLogPayloads['unsetRemoteInstanceNSFW'];
+} | {
     type: 'resetPassword';
     info: ModerationLogPayloads['resetPassword'];
 } | {
@@ -2619,6 +2632,12 @@ type ModerationLog = {
     type: 'unsuspendRemoteInstance';
     info: ModerationLogPayloads['unsuspendRemoteInstance'];
 } | {
+    type: 'rejectRemoteInstanceReports';
+    info: ModerationLogPayloads['rejectRemoteInstanceReports'];
+} | {
+    type: 'acceptRemoteInstanceReports';
+    info: ModerationLogPayloads['acceptRemoteInstanceReports'];
+} | {
     type: 'updateRemoteInstanceNote';
     info: ModerationLogPayloads['updateRemoteInstanceNote'];
 } | {
@@ -2696,7 +2715,7 @@ type ModerationLog = {
 });
 
 // @public (undocumented)
-export const moderationLogTypes: readonly ["updateServerSettings", "suspend", "approve", "unsuspend", "updateUserNote", "addCustomEmoji", "updateCustomEmoji", "deleteCustomEmoji", "assignRole", "unassignRole", "createRole", "updateRole", "deleteRole", "clearQueue", "promoteQueue", "deleteDriveFile", "deleteNote", "createGlobalAnnouncement", "createUserAnnouncement", "updateGlobalAnnouncement", "updateUserAnnouncement", "deleteGlobalAnnouncement", "deleteUserAnnouncement", "resetPassword", "suspendRemoteInstance", "unsuspendRemoteInstance", "updateRemoteInstanceNote", "markSensitiveDriveFile", "unmarkSensitiveDriveFile", "resolveAbuseReport", "forwardAbuseReport", "updateAbuseReportNote", "createInvitation", "createAd", "updateAd", "deleteAd", "createAvatarDecoration", "updateAvatarDecoration", "deleteAvatarDecoration", "unsetUserAvatar", "unsetUserBanner", "createSystemWebhook", "updateSystemWebhook", "deleteSystemWebhook", "createAbuseReportNotificationRecipient", "updateAbuseReportNotificationRecipient", "deleteAbuseReportNotificationRecipient", "deleteAccount", "deletePage", "deleteFlash", "deleteGalleryPost"];
+export const moderationLogTypes: readonly ["updateServerSettings", "suspend", "approve", "decline", "unsuspend", "updateUserNote", "addCustomEmoji", "updateCustomEmoji", "deleteCustomEmoji", "assignRole", "unassignRole", "createRole", "updateRole", "deleteRole", "clearQueue", "promoteQueue", "deleteDriveFile", "deleteNote", "createGlobalAnnouncement", "createUserAnnouncement", "updateGlobalAnnouncement", "updateUserAnnouncement", "deleteGlobalAnnouncement", "deleteUserAnnouncement", "resetPassword", "setMandatoryCW", "setRemoteInstanceNSFW", "unsetRemoteInstanceNSFW", "suspendRemoteInstance", "unsuspendRemoteInstance", "rejectRemoteInstanceReports", "acceptRemoteInstanceReports", "updateRemoteInstanceNote", "markSensitiveDriveFile", "unmarkSensitiveDriveFile", "resolveAbuseReport", "forwardAbuseReport", "updateAbuseReportNote", "createInvitation", "createAd", "updateAd", "deleteAd", "createAvatarDecoration", "updateAvatarDecoration", "deleteAvatarDecoration", "unsetUserAvatar", "unsetUserBanner", "createSystemWebhook", "updateSystemWebhook", "deleteSystemWebhook", "createAbuseReportNotificationRecipient", "updateAbuseReportNotificationRecipient", "deleteAbuseReportNotificationRecipient", "deleteAccount", "deletePage", "deleteFlash", "deleteGalleryPost"];
 
 // @public (undocumented)
 type MuteCreateRequest = operations['mute___create']['requestBody']['content']['application/json'];
@@ -3006,7 +3025,7 @@ type PartialRolePolicyOverride = Partial<{
 }>;
 
 // @public (undocumented)
-export const permissions: readonly ["read:account", "write:account", "read:blocks", "write:blocks", "read:drive", "write:drive", "read:favorites", "write:favorites", "read:following", "write:following", "read:messaging", "write:messaging", "read:mutes", "write:mutes", "write:notes", "read:notes-schedule", "write:notes-schedule", "read:notifications", "write:notifications", "read:reactions", "write:reactions", "write:votes", "read:pages", "write:pages", "write:page-likes", "read:page-likes", "read:user-groups", "write:user-groups", "read:channels", "write:channels", "read:gallery", "write:gallery", "read:gallery-likes", "write:gallery-likes", "read:flash", "write:flash", "read:flash-likes", "write:flash-likes", "read:admin:abuse-user-reports", "write:admin:delete-account", "write:admin:delete-all-files-of-a-user", "read:admin:index-stats", "read:admin:table-stats", "read:admin:user-ips", "read:admin:meta", "write:admin:reset-password", "write:admin:resolve-abuse-user-report", "write:admin:send-email", "read:admin:server-info", "read:admin:show-moderation-log", "read:admin:show-user", "write:admin:suspend-user", "write:admin:approve-user", "write:admin:decline-user", "write:admin:nsfw-user", "write:admin:unnsfw-user", "write:admin:silence-user", "write:admin:unsilence-user", "write:admin:unset-user-avatar", "write:admin:unset-user-banner", "write:admin:unsuspend-user", "write:admin:meta", "write:admin:user-note", "write:admin:roles", "read:admin:roles", "write:admin:relays", "read:admin:relays", "write:admin:invite-codes", "read:admin:invite-codes", "write:admin:announcements", "read:admin:announcements", "write:admin:avatar-decorations", "read:admin:avatar-decorations", "write:admin:federation", "write:admin:account", "read:admin:account", "write:admin:emoji", "read:admin:emoji", "write:admin:queue", "read:admin:queue", "write:admin:promo", "write:admin:drive", "read:admin:drive", "write:admin:ad", "read:admin:ad", "write:invite-codes", "read:invite-codes", "write:clip-favorite", "read:clip-favorite", "read:federation", "write:report-abuse"];
+export const permissions: readonly ["read:account", "write:account", "read:blocks", "write:blocks", "read:drive", "write:drive", "read:favorites", "write:favorites", "read:following", "write:following", "read:messaging", "write:messaging", "read:mutes", "write:mutes", "write:notes", "read:notes-schedule", "write:notes-schedule", "read:notifications", "write:notifications", "read:reactions", "write:reactions", "write:votes", "read:pages", "write:pages", "write:page-likes", "read:page-likes", "read:user-groups", "write:user-groups", "read:channels", "write:channels", "read:gallery", "write:gallery", "read:gallery-likes", "write:gallery-likes", "read:flash", "write:flash", "read:flash-likes", "write:flash-likes", "read:admin:abuse-user-reports", "write:admin:delete-account", "write:admin:delete-all-files-of-a-user", "read:admin:index-stats", "read:admin:table-stats", "read:admin:user-ips", "read:admin:meta", "write:admin:reset-password", "write:admin:resolve-abuse-user-report", "write:admin:send-email", "read:admin:server-info", "read:admin:show-moderation-log", "read:admin:show-user", "write:admin:suspend-user", "write:admin:approve-user", "write:admin:decline-user", "write:admin:nsfw-user", "write:admin:unnsfw-user", "write:admin:cw-user", "write:admin:silence-user", "write:admin:unsilence-user", "write:admin:unset-user-avatar", "write:admin:unset-user-banner", "write:admin:unsuspend-user", "write:admin:meta", "write:admin:user-note", "write:admin:roles", "read:admin:roles", "write:admin:relays", "read:admin:relays", "write:admin:invite-codes", "read:admin:invite-codes", "write:admin:announcements", "read:admin:announcements", "write:admin:avatar-decorations", "read:admin:avatar-decorations", "write:admin:federation", "write:admin:account", "read:admin:account", "write:admin:emoji", "read:admin:emoji", "write:admin:queue", "read:admin:queue", "write:admin:promo", "write:admin:drive", "read:admin:drive", "write:admin:ad", "read:admin:ad", "write:invite-codes", "read:invite-codes", "write:clip-favorite", "read:clip-favorite", "read:federation", "write:report-abuse"];
 
 // @public (undocumented)
 type PingResponse = operations['ping']['responses']['200']['content']['application/json'];
diff --git a/packages/misskey-js/src/autogen/apiClientJSDoc.ts b/packages/misskey-js/src/autogen/apiClientJSDoc.ts
index f4120b3afc..99e202a1b6 100644
--- a/packages/misskey-js/src/autogen/apiClientJSDoc.ts
+++ b/packages/misskey-js/src/autogen/apiClientJSDoc.ts
@@ -275,6 +275,17 @@ declare module '../api.js' {
     /**
      * No description provided.
      * 
+     * **Credential required**: *Yes* / **Permission**: *write:admin:cw-user*
+     */
+    request<E extends 'admin/cw-user', P extends Endpoints[E]['req']>(
+      endpoint: E,
+      params: P,
+      credential?: string | null,
+    ): Promise<SwitchCaseResponseType<E, P>>;
+
+    /**
+     * No description provided.
+     * 
      * **Credential required**: *Yes* / **Permission**: *write:admin:decline-user*
      */
     request<E extends 'admin/decline-user', P extends Endpoints[E]['req']>(
diff --git a/packages/misskey-js/src/autogen/endpoint.ts b/packages/misskey-js/src/autogen/endpoint.ts
index c8000fc1d0..b31dd2d8f1 100644
--- a/packages/misskey-js/src/autogen/endpoint.ts
+++ b/packages/misskey-js/src/autogen/endpoint.ts
@@ -38,6 +38,7 @@ import type {
 	AdminAvatarDecorationsUpdateRequest,
 	AdminCaptchaCurrentResponse,
 	AdminCaptchaSaveRequest,
+	AdminCwUserRequest,
 	AdminDeclineUserRequest,
 	AdminDeleteAccountRequest,
 	AdminDeleteAllFilesOfAUserRequest,
@@ -633,6 +634,7 @@ export type Endpoints = {
 	'admin/avatar-decorations/update': { req: AdminAvatarDecorationsUpdateRequest; res: EmptyResponse };
 	'admin/captcha/current': { req: EmptyRequest; res: AdminCaptchaCurrentResponse };
 	'admin/captcha/save': { req: AdminCaptchaSaveRequest; res: EmptyResponse };
+	'admin/cw-user': { req: AdminCwUserRequest; res: EmptyResponse };
 	'admin/decline-user': { req: AdminDeclineUserRequest; res: EmptyResponse };
 	'admin/delete-account': { req: AdminDeleteAccountRequest; res: EmptyResponse };
 	'admin/delete-all-files-of-a-user': { req: AdminDeleteAllFilesOfAUserRequest; res: EmptyResponse };
diff --git a/packages/misskey-js/src/autogen/entities.ts b/packages/misskey-js/src/autogen/entities.ts
index 3db711f9a4..c65669d056 100644
--- a/packages/misskey-js/src/autogen/entities.ts
+++ b/packages/misskey-js/src/autogen/entities.ts
@@ -41,6 +41,7 @@ export type AdminAvatarDecorationsListResponse = operations['admin___avatar-deco
 export type AdminAvatarDecorationsUpdateRequest = operations['admin___avatar-decorations___update']['requestBody']['content']['application/json'];
 export type AdminCaptchaCurrentResponse = operations['admin___captcha___current']['responses']['200']['content']['application/json'];
 export type AdminCaptchaSaveRequest = operations['admin___captcha___save']['requestBody']['content']['application/json'];
+export type AdminCwUserRequest = operations['admin___cw-user']['requestBody']['content']['application/json'];
 export type AdminDeclineUserRequest = operations['admin___decline-user']['requestBody']['content']['application/json'];
 export type AdminDeleteAccountRequest = operations['admin___delete-account']['requestBody']['content']['application/json'];
 export type AdminDeleteAllFilesOfAUserRequest = operations['admin___delete-all-files-of-a-user']['requestBody']['content']['application/json'];
diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index 9bac7a812c..46356613ac 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -233,6 +233,15 @@ export type paths = {
      */
     post: operations['admin___captcha___save'];
   };
+  '/admin/cw-user': {
+    /**
+     * admin/cw-user
+     * @description No description provided.
+     *
+     * **Credential required**: *Yes* / **Permission**: *write:admin:cw-user*
+     */
+    post: operations['admin___cw-user'];
+  };
   '/admin/decline-user': {
     /**
      * admin/decline-user
@@ -3968,6 +3977,7 @@ export type components = {
       isSystem?: boolean;
       noindex: boolean;
       enableRss: boolean;
+      mandatoryCW: string | null;
       isBot?: boolean;
       isCat?: boolean;
       speakAsCat?: boolean;
@@ -6888,6 +6898,59 @@ export type operations = {
     };
   };
   /**
+   * admin/cw-user
+   * @description No description provided.
+   *
+   * **Credential required**: *Yes* / **Permission**: *write:admin:cw-user*
+   */
+  'admin___cw-user': {
+    requestBody: {
+      content: {
+        'application/json': {
+          /** Format: misskey:id */
+          userId: string;
+          cw: string | null;
+        };
+      };
+    };
+    responses: {
+      /** @description OK (without any results) */
+      204: {
+        content: never;
+      };
+      /** @description Client error */
+      400: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Authentication error */
+      401: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Forbidden error */
+      403: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description I'm Ai */
+      418: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Internal server error */
+      500: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+    };
+  };
+  /**
    * admin/decline-user
    * @description No description provided.
    *
diff --git a/packages/misskey-js/src/consts.ts b/packages/misskey-js/src/consts.ts
index 0faf3dddc4..96da0a8fad 100644
--- a/packages/misskey-js/src/consts.ts
+++ b/packages/misskey-js/src/consts.ts
@@ -83,6 +83,7 @@ export const permissions = [
 	'write:admin:decline-user',
 	'write:admin:nsfw-user',
 	'write:admin:unnsfw-user',
+	'write:admin:cw-user',
 	'write:admin:silence-user',
 	'write:admin:unsilence-user',
 	'write:admin:unset-user-avatar',
@@ -124,6 +125,7 @@ export const moderationLogTypes = [
 	'updateServerSettings',
 	'suspend',
 	'approve',
+	'decline',
 	'unsuspend',
 	'updateUserNote',
 	'addCustomEmoji',
@@ -145,8 +147,13 @@ export const moderationLogTypes = [
 	'deleteGlobalAnnouncement',
 	'deleteUserAnnouncement',
 	'resetPassword',
+	'setMandatoryCW',
+	'setRemoteInstanceNSFW',
+	'unsetRemoteInstanceNSFW',
 	'suspendRemoteInstance',
 	'unsuspendRemoteInstance',
+	'rejectRemoteInstanceReports',
+	'acceptRemoteInstanceReports',
 	'updateRemoteInstanceNote',
 	'markSensitiveDriveFile',
 	'unmarkSensitiveDriveFile',
@@ -186,7 +193,14 @@ export const reversiUpdateKeys = [
 
 export type ReversiUpdateKey = typeof reversiUpdateKeys[number];
 
-type AvatarDecoration = UserLite['avatarDecorations'][number];
+interface AvatarDecoration {
+	id: string;
+	updatedAt: string | null;
+	url: string;
+	name: string;
+	description: string;
+	roleIdsThatCanBeUsedThisDecoration: string[];
+}
 
 type ReceivedAbuseReport = {
 	reportId: AbuseReportNotificationRecipient['id'];
@@ -322,6 +336,21 @@ export type ModerationLogPayloads = {
 		userUsername: string;
 		userHost: string | null;
 	};
+	setMandatoryCW: {
+		newCW: string | null;
+		oldCW: string | null;
+		userId: string;
+		userUsername: string;
+		userHost: string | null;
+	};
+	setRemoteInstanceNSFW: {
+		id: string;
+		host: string;
+	};
+	unsetRemoteInstanceNSFW: {
+		id: string;
+		host: string;
+	};
 	suspendRemoteInstance: {
 		id: string;
 		host: string;
@@ -330,6 +359,14 @@ export type ModerationLogPayloads = {
 		id: string;
 		host: string;
 	};
+	rejectRemoteInstanceReports: {
+		id: string;
+		host: string;
+	};
+	acceptRemoteInstanceReports: {
+		id: string;
+		host: string;
+	};
 	updateRemoteInstanceNote: {
 		id: string;
 		host: string;
diff --git a/packages/misskey-js/src/entities.ts b/packages/misskey-js/src/entities.ts
index efe5ba19fb..3e88eae275 100644
--- a/packages/misskey-js/src/entities.ts
+++ b/packages/misskey-js/src/entities.ts
@@ -118,6 +118,15 @@ export type ModerationLog = {
 	type: 'deleteUserAnnouncement';
 	info: ModerationLogPayloads['deleteUserAnnouncement'];
 } | {
+	type: 'setMandatoryCW';
+	info: ModerationLogPayloads['setMandatoryCW'];
+} | {
+	type: 'setRemoteInstanceNSFW';
+	info: ModerationLogPayloads['setRemoteInstanceNSFW'];
+} | {
+	type: 'unsetRemoteInstanceNSFW';
+	info: ModerationLogPayloads['unsetRemoteInstanceNSFW'];
+} | {
 	type: 'resetPassword';
 	info: ModerationLogPayloads['resetPassword'];
 } | {
@@ -127,6 +136,12 @@ export type ModerationLog = {
 	type: 'unsuspendRemoteInstance';
 	info: ModerationLogPayloads['unsuspendRemoteInstance'];
 } | {
+	type: 'rejectRemoteInstanceReports';
+	info: ModerationLogPayloads['rejectRemoteInstanceReports'];
+} | {
+	type: 'acceptRemoteInstanceReports';
+	info: ModerationLogPayloads['acceptRemoteInstanceReports'];
+} | {
 	type: 'updateRemoteInstanceNote';
 	info: ModerationLogPayloads['updateRemoteInstanceNote'];
 } | {
diff --git a/sharkey-locales/en-US.yml b/sharkey-locales/en-US.yml
index 86eafc8a33..af2db91286 100644
--- a/sharkey-locales/en-US.yml
+++ b/sharkey-locales/en-US.yml
@@ -303,6 +303,8 @@ _abuseReport:
         webhook: "Send a notification to the SystemWebhook when an abuse report is received or resolved."
 _moderationLogTypes:
   approve: "Approved"
+  decline: "Declined"
+  setMandatoryCW: "Set content warning for user"
   setRemoteInstanceNSFW: "Set remote instance as NSFW"
   unsetRemoteInstanceNSFW: "Set remote instance as NSFW"
   rejectRemoteInstanceReports: "Rejected reports from remote instance"
@@ -436,6 +438,7 @@ _permissions:
   "write:admin:decline-user": "Decline new users"
   "write:admin:nsfw-user": "Mark users as NSFW"
   "write:admin:unnsfw-user": "Mark users an not NSFW"
+  "write:admin:cw-user": "Apply mandatory CW on users"
   "write:admin:silence-user": "Silence users"
   "write:admin:unsilence-user": "Un-silence users"
   "read:notes-schedule": "View your list of scheduled notes"
@@ -471,3 +474,6 @@ _noteSearch:
     flash: "Flash"
 
 id: "ID"
+
+mandatoryCW: "Force content warning"
+mandatoryCWDescription: "Applies a content warning to all posts created by this user. If the post already has a CW, then this is appended to the end."