apply patches

locales/en-US.yml

@@ -1132,6 +1132,11 @@ openInMainColumn: "Open in main column"
 searchNotLoggedIn_1: "You have to be authenticated in order to use full text search."
 searchNotLoggedIn_2: "However, you can search using hashtags, and search users."
 searchEmptyQuery: "Please enter a search term."
+bite: "Bite"
+biteBack: "Bite back"
+bittenBack: "Bitten back"
+bitYou: "bit you"
+bitYouBack: "bit you back"
 
 _sensitiveMediaDetection:
   description: "Reduces the effort of server moderation through automatically recognizing
@@ -2108,6 +2113,7 @@ _notification:
     followRequestAccepted: "Accepted follow requests"
     groupInvited: "Group invitations"
     app: "Notifications from linked apps"
+    bite: "Bites"
   _actions:
     followBack: "followed you back"
     reply: "Reply"

packages/backend/src/db/postgre.ts

@@ -76,6 +76,7 @@ import { OAuthApp } from "@/models/entities/oauth-app.js";
 import { OAuthToken } from "@/models/entities/oauth-token.js";
 import { HtmlNoteCacheEntry } from "@/models/entities/html-note-cache-entry.js";
 import { HtmlUserCacheEntry } from "@/models/entities/html-user-cache-entry.js";
+import { Bite } from "@/models/entities/bite.js";
 
 const sqlLogger = dbLogger.createSubLogger("sql", "gray", false);
 class MyCustomLogger implements Logger {
@@ -179,6 +180,7 @@ export const entities = [
 	OAuthToken,
 	HtmlNoteCacheEntry,
 	HtmlUserCacheEntry,
+	Bite,
 	...charts,
 ];
 

packages/backend/src/migration/1705528046452-federated-bite.ts

@@ -0,0 +1,45 @@
+import { MigrationInterface, QueryRunner } from "typeorm";
+
+export class FederatedBite1705528046452 implements MigrationInterface {
+	name = 'FederatedBite1705528046452'
+
+	public async up(queryRunner: QueryRunner): Promise<void> {
+		await queryRunner.query(`CREATE TYPE "public"."bite_targettype_enum" AS ENUM('user', 'bite')`);
+		await queryRunner.query(`CREATE TABLE "bite" ("id" character varying(32) NOT NULL, "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL, "uri" character varying(512), "userId" character varying(32) NOT NULL, "targetType" "public"."bite_targettype_enum" NOT NULL, "targetUserId" character varying(32), "targetBiteId" character varying(32), "replied" boolean NOT NULL DEFAULT true, CONSTRAINT "CHK_c3a20c5756ccff3133f8927500" CHECK ("targetUserId" IS NOT NULL OR "targetBiteId" IS NOT NULL), CONSTRAINT "PK_1887f3f621a4a7655a1b78bfd66" PRIMARY KEY ("id")); COMMENT ON COLUMN "bite"."uri" IS 'null if local'`);
+		await queryRunner.query(`ALTER TABLE "notification" ADD "biteId" character varying(32)`);
+		await queryRunner.query(`ALTER TYPE "public"."user_profile_mutingnotificationtypes_enum" RENAME TO "user_profile_mutingnotificationtypes_enum_old"`);
+		await queryRunner.query(`CREATE TYPE "public"."user_profile_mutingnotificationtypes_enum" AS ENUM('follow', 'mention', 'reply', 'renote', 'quote', 'reaction', 'pollVote', 'pollEnded', 'receiveFollowRequest', 'followRequestAccepted', 'groupInvited', 'app', 'bite')`);
+		await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" DROP DEFAULT`);
+		await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" TYPE "public"."user_profile_mutingnotificationtypes_enum"[] USING "mutingNotificationTypes"::"text"::"public"."user_profile_mutingnotificationtypes_enum"[]`);
+		await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" SET DEFAULT '{}'`);
+		await queryRunner.query(`DROP TYPE "public"."user_profile_mutingnotificationtypes_enum_old"`);
+		await queryRunner.query(`ALTER TABLE "bite" ADD CONSTRAINT "FK_8d00aa79e157364ac1f60c15098" FOREIGN KEY ("userId") REFERENCES "user"("id") ON DELETE CASCADE ON UPDATE NO ACTION`);
+		await queryRunner.query(`ALTER TABLE "bite" ADD CONSTRAINT "FK_a646fbbeb6efa2531c75fec46b9" FOREIGN KEY ("targetUserId") REFERENCES "user"("id") ON DELETE CASCADE ON UPDATE NO ACTION`);
+		await queryRunner.query(`ALTER TABLE "bite" ADD CONSTRAINT "FK_5d5f68610583f2e0b6785d3c0e9" FOREIGN KEY ("targetBiteId") REFERENCES "bite"("id") ON DELETE CASCADE ON UPDATE NO ACTION`);
+		await queryRunner.query(`ALTER TABLE "notification" ADD CONSTRAINT "FK_c54844158c1eead7042e7ca4c83" FOREIGN KEY ("biteId") REFERENCES "bite"("id") ON DELETE CASCADE ON UPDATE NO ACTION`);
+		await queryRunner.query(`ALTER TYPE "public"."notification_type_enum" RENAME TO "notification_type_enum_old"`);
+		await queryRunner.query(`CREATE TYPE "public"."notification_type_enum" AS ENUM('follow', 'mention', 'reply', 'renote', 'quote', 'reaction', 'pollVote', 'pollEnded', 'receiveFollowRequest', 'followRequestAccepted', 'groupInvited', 'app', 'bite')`);
+		await queryRunner.query(`ALTER TABLE "notification" ALTER COLUMN "type" TYPE "public"."notification_type_enum" USING "type"::"text"::"public"."notification_type_enum"`);
+		await queryRunner.query(`DROP TYPE "public"."notification_type_enum_old"`);
+	}
+
+	public async down(queryRunner: QueryRunner): Promise<void> {
+		await queryRunner.query(`ALTER TABLE "notification" DROP CONSTRAINT "FK_c54844158c1eead7042e7ca4c83"`);
+		await queryRunner.query(`ALTER TABLE "bite" DROP CONSTRAINT "FK_5d5f68610583f2e0b6785d3c0e9"`);
+		await queryRunner.query(`ALTER TABLE "bite" DROP CONSTRAINT "FK_a646fbbeb6efa2531c75fec46b9"`);
+		await queryRunner.query(`ALTER TABLE "bite" DROP CONSTRAINT "FK_8d00aa79e157364ac1f60c15098"`);
+		await queryRunner.query(`CREATE TYPE "public"."user_profile_mutingnotificationtypes_enum_old" AS ENUM('follow', 'mention', 'reply', 'renote', 'quote', 'reaction', 'pollVote', 'pollEnded', 'receiveFollowRequest', 'followRequestAccepted', 'groupInvited', 'app')`);
+		await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" DROP DEFAULT`);
+		await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" TYPE "public"."user_profile_mutingnotificationtypes_enum_old"[] USING "mutingNotificationTypes"::"text"::"public"."user_profile_mutingnotificationtypes_enum_old"[]`);
+		await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" SET DEFAULT '{}'`);
+		await queryRunner.query(`DROP TYPE "public"."user_profile_mutingnotificationtypes_enum"`);
+		await queryRunner.query(`ALTER TYPE "public"."user_profile_mutingnotificationtypes_enum_old" RENAME TO "user_profile_mutingnotificationtypes_enum"`);
+		await queryRunner.query(`ALTER TABLE "notification" DROP COLUMN "biteId"`);
+		await queryRunner.query(`DROP TABLE "bite"`);
+		await queryRunner.query(`DROP TYPE "public"."bite_targettype_enum"`);
+		await queryRunner.query(`CREATE TYPE "public"."notification_type_enum_old" AS ENUM('follow', 'mention', 'reply', 'renote', 'quote', 'reaction', 'pollVote', 'pollEnded', 'receiveFollowRequest', 'followRequestAccepted', 'groupInvited', 'app')`);
+		await queryRunner.query(`ALTER TABLE "notification" ALTER COLUMN "type" TYPE "public"."notification_type_enum_old" USING "type"::"text"::"public"."notification_type_enum_old"`);
+		await queryRunner.query(`DROP TYPE "public"."notification_type_enum"`);
+		await queryRunner.query(`ALTER TYPE "public"."notification_type_enum_old" RENAME TO "notification_type_enum"`);
+	}
+}

packages/backend/src/misc/schema.ts

@@ -31,6 +31,7 @@ import { packedQueueCountSchema } from "@/models/schema/queue.js";
 import { packedGalleryPostSchema } from "@/models/schema/gallery-post.js";
 import { packedEmojiSchema } from "@/models/schema/emoji.js";
 import { packedNoteEdit } from "@/models/schema/note-edit.js";
+import { packedBiteSchema } from "@/models/schema/bite.js";
 
 export const refs = {
 	UserLite: packedUserLiteSchema,
@@ -65,6 +66,7 @@ export const refs = {
 	FederationInstance: packedFederationInstanceSchema,
 	GalleryPost: packedGalleryPostSchema,
 	Emoji: packedEmojiSchema,
+	Bite: packedBiteSchema,
 };
 
 export type Packed<x extends keyof typeof refs> = SchemaType<typeof refs[x]>;

packages/backend/src/models/entities/bite.ts

@@ -0,0 +1,56 @@
+import { Check, Column, Entity, ManyToOne, PrimaryColumn } from "typeorm";
+import { id } from "../id.js";
+import { User } from "./user.js";
+
+@Entity()
+@Check(`"targetUserId" IS NOT NULL OR "targetBiteId" IS NOT NULL`)
+export class Bite {
+	@PrimaryColumn(id())
+	public id: string;
+
+	@Column("timestamp with time zone")
+	public createdAt: Date;
+
+	@Column("varchar", {
+		length: 512,
+		nullable: true,
+		comment: "null if local",
+	})
+	public uri: string | null;
+
+	@Column(id())
+	public userId: string;
+
+	@ManyToOne(() => User, {
+		onDelete: "CASCADE",
+	})
+	public user: User;
+
+	@Column("enum", {
+		enum: ["user", "bite"],
+	})
+	public targetType: "user" | "bite";
+
+	@Column({ ...id(), nullable: true })
+	public targetUserId: string | null;
+
+	@ManyToOne(() => User, {
+		onDelete: "CASCADE",
+		nullable: true,
+	})
+	public targetUser: User | null;
+
+	@Column({ ...id(), nullable: true })
+	public targetBiteId: string | null;
+
+	@ManyToOne(() => Bite, {
+		onDelete: "CASCADE",
+		nullable: true,
+	})
+	public targetBite: Bite | null;
+
+	@Column("boolean", {
+		default: true,
+	})
+	public replied: boolean;
+}

packages/backend/src/models/entities/notification.ts

@@ -13,6 +13,7 @@ import { FollowRequest } from "./follow-request.js";
 import { UserGroupInvitation } from "./user-group-invitation.js";
 import { AccessToken } from "./access-token.js";
 import { notificationTypes } from "@/types.js";
+import { Bite } from "./bite.js";
 
 @Entity()
 export class Notification {
@@ -181,4 +182,12 @@ export class Notification {
 	})
 	@JoinColumn()
 	public appAccessToken: AccessToken | null;
+
+	@Column({ ...id(), nullable: true })
+	public biteId: Bite["id"] | null;
+
+	@ManyToOne((type) => Bite, {
+		onDelete: "CASCADE", nullable: true
+	})
+	public bite: Bite | null;
 }

packages/backend/src/models/index.ts

@@ -70,6 +70,7 @@ import { OAuthToken } from "@/models/entities/oauth-token.js";
 import { UserProfileRepository } from "@/models/repositories/user-profile.js";
 import { HtmlNoteCacheEntry } from "@/models/entities/html-note-cache-entry.js";
 import { HtmlUserCacheEntry } from "@/models/entities/html-user-cache-entry.js";
+import { BiteRespository } from "./repositories/bite.js";
 
 export const Announcements = db.getRepository(Announcement);
 export const AnnouncementReads = db.getRepository(AnnouncementRead);
@@ -138,3 +139,4 @@ export const OAuthApps = db.getRepository(OAuthApp);
 export const OAuthTokens = db.getRepository(OAuthToken);
 export const HtmlUserCacheEntries = db.getRepository(HtmlUserCacheEntry);
 export const HtmlNoteCacheEntries = db.getRepository(HtmlNoteCacheEntry);
+export const Bites = BiteRespository;

packages/backend/src/models/repositories/bite.ts

@@ -0,0 +1,71 @@
+import { db } from "@/db/postgre.js";
+import { Bite } from "../entities/bite.js";
+import { Packed } from "@/misc/schema.js";
+import { Bites, Users } from "../index.js";
+import { User } from "../entities/user.js";
+import { awaitAll } from "@/prelude/await-all.js";
+import config from "@/config/index.js";
+
+export const BiteRespository = db.getRepository(Bite).extend({
+	async pack(
+		src: Bite | Bite["id"],
+		me?: { id: User["id"] } | null | undefined,
+	): Promise<Packed<"Bite">> {
+		const bite =
+			typeof src === "object" ? src : await this.findOneByOrFail({ id: src });
+		return await awaitAll({
+			id: bite.id,
+			user: Users.pack(bite.user ?? bite.userId, me, { detail: false }),
+			targetType: bite.targetType,
+			target: this.packTarget(bite, me),
+			replied: bite.replied,
+		});
+	},
+
+	async packTarget(
+		bite: Bite,
+		me?: { id: User["id"] } | null | undefined,
+	): Promise<Packed<"UserLite"> | Packed<"Bite">> {
+		switch (bite.targetType) {
+			case "user":
+				return await Users.pack(bite.targetUser ?? bite.targetUserId!, me, {
+					detail: false,
+				});
+			case "bite":
+				return await this.pack(bite.targetBite ?? bite.targetBiteId!, me);
+		}
+	},
+
+	async targetUri(bite: Bite): Promise<string> {
+		switch (bite.targetType) {
+			case "user": {
+				bite.targetUser =
+					bite.targetUser ??
+					(await Users.findOneOrFail({ where: { id: bite.targetUserId! } }));
+				return (
+					bite.targetUser.uri || `${config.url}/users/${bite.targetUserId}`
+				);
+			}
+			case "bite": {
+				bite.targetBite =
+					bite.targetBite ??
+					(await Bites.findOneOrFail({ where: { id: bite.targetBiteId! } }));
+				return (
+					bite.targetBite.uri || `${config.url}/bites/${bite.targetBiteId}`
+				);
+			}
+		}
+	},
+
+	async targetUserId(bite: Bite): Promise<User["id"]> {
+		switch (bite.targetType) {
+			case "user":
+				return bite.targetUserId!;
+			case "bite":
+				bite.targetBite =
+					bite.targetBite ??
+					(await Bites.findOneByOrFail({ id: bite.targetBiteId! }));
+				return bite.targetBite.userId;
+		}
+	},
+});

packages/backend/src/models/repositories/notification.ts

@@ -14,6 +14,7 @@ import {
 	UserGroupInvitations,
 	AccessTokens,
 	NoteReactions,
+	Bites,
 } from "../index.js";
 
 export const NotificationRepository = db.getRepository(Notification).extend({
@@ -143,6 +144,11 @@ export const NotificationRepository = db.getRepository(Notification).extend({
 						icon: notification.customIcon || token?.iconUrl,
 				  }
 				: {}),
+			...(notification.type === "bite"
+				? {
+						bite: notification.bite ?? await Bites.findOneBy({ id: notification.biteId! }),
+				  }
+				: {}),
 		});
 	},
 

packages/backend/src/models/schema/bite.ts

@@ -0,0 +1,31 @@
+export const packedBiteSchema = {
+	type: "object",
+	properties: {
+		id: {
+			type: "string",
+			format: "id",
+			optional: false,
+			nullable: false,
+		},
+		user: {
+			type: "object",
+			ref: "UserLite",
+		},
+		targetType: {
+			type: "string",
+			enum: ["user", "bite"],
+		},
+		target: {
+			oneOf: [
+				{
+					type: "object",
+					ref: "UserLite",
+				},
+				{
+					type: "object",
+					ref: "Bite",
+				},
+			],
+		},
+	},
+} as const;

packages/backend/src/models/schema/notification.ts

@@ -75,5 +75,11 @@ export const packedNotificationSchema = {
 			optional: true,
 			nullable: true,
 		},
+		bite: {
+			type: "object",
+			ref: "Bite",
+			optional: true,
+			nullable: true,
+		},
 	},
 } as const;

packages/backend/src/remote/activitypub/kernel/bite.ts

@@ -0,0 +1,79 @@
+import { CacheableRemoteUser } from "@/models/entities/user.js";
+import { IActivity, IBite } from "../type.js";
+import Resolver from "../resolver.js";
+import { fetchPerson } from "../models/person.js";
+import config from "@/config/index.js";
+import { genId } from "@/misc/gen-id.js";
+import { createBite } from "@/services/create-bite.js";
+import { Bite } from "@/models/entities/bite.js";
+
+export default async (
+	actor: CacheableRemoteUser,
+	bite: IBite,
+): Promise<string> => {
+	if (actor.uri !== bite.actor) {
+		return "skip: actor uri mismatch";
+	}
+
+	if (bite.id === null) {
+		return "skip: bite id not specified";
+	}
+
+	const resolver = new Resolver();
+	const biteActor = await fetchPerson(bite.actor, resolver);
+	if (biteActor === null) {
+		return "skip: biteActor is null";
+	}
+	if (!bite.target.startsWith(`${config.url}/`)) {
+		return "skip: target is not local";
+	}
+
+	const localId = genId();
+	const fields = {
+		id: localId,
+		userId: biteActor.id,
+		replied: false,
+	} as any;
+
+	const parts = bite.target.split("/");
+	const targetDbId = parts.pop();
+	const targetPathType = parts.pop();
+
+	let targetType: Bite["targetType"];
+	let targetId;
+
+	if (targetPathType === "users") {
+		targetType = "user";
+		targetId = targetDbId;
+	} else if (targetPathType === "bites") {
+		targetType = "bite";
+		targetId = targetDbId;
+	} else {
+		// fallback for unknown object types
+		targetType = "user";
+		if (bite.to !== undefined) {
+			const to = Array.isArray(bite.to) ? bite.to[0] : bite.to;
+			targetId = (to as string).split("/").pop();
+		} else {
+			const biteTarget = await resolver.resolve(bite.target);
+			const targetActor =
+				(biteTarget as IActivity).actor || biteTarget.attributedTo;
+			const targetActorId =
+				typeof targetActor === "string" ? targetActor : (targetActor as any).id;
+			if (!targetActorId.startsWith(`${config.url}/`)) {
+				return "skip: indirect target is not local";
+			}
+			targetId = targetActorId.split("/").pop();
+		}
+	}
+
+	await createBite(
+		biteActor,
+		targetType,
+		targetId,
+		bite.id!,
+		bite.published ? new Date(bite.published) : null,
+	);
+
+	return "ok";
+};

packages/backend/src/remote/activitypub/kernel/index.ts

@@ -19,6 +19,7 @@ import {
 	isFlag,
 	isMove,
 	getApId,
+	isBite,
 } from "../type.js";
 import { apLogger } from "../logger.js";
 import Resolver from "../resolver.js";
@@ -37,6 +38,7 @@ import remove from "./remove/index.js";
 import block from "./block/index.js";
 import flag from "./flag/index.js";
 import move from "./move/index.js";
+import bite from "./bite.js";
 import type { IObject } from "../type.js";
 import { extractDbHost } from "@/misc/convert-host.js";
 import { shouldBlockInstance } from "@/misc/should-block-instance.js";
@@ -105,6 +107,8 @@ async function performOneActivity(
 		await flag(actor, activity);
 	} else if (isMove(activity)) {
 		await move(actor, activity);
+	} else if (isBite(activity)) {
+		await bite(actor, activity);
 	} else {
 		apLogger.warn(`unrecognized activity type: ${(activity as any).type}`);
 	}

packages/backend/src/remote/activitypub/renderer/bite.ts

@@ -0,0 +1,12 @@
+import config from "@/config/index.js";
+import { Bites } from "@/models/index.js";
+import { Bite } from "@/models/entities/bite.js";
+
+export default async (bite: Bite) => ({
+	id: `${config.url}/bites/${bite.id}`,
+	type: "Bite",
+	actor: `${config.url}/users/${bite.userId}`,
+	target: await Bites.targetUri(bite),
+	published: bite.createdAt.toISOString(),
+	to: await Bites.targetUserId(bite),
+});

packages/backend/src/remote/activitypub/renderer/index.ts

@@ -47,6 +47,8 @@ export const renderActivity = (x: any): IActivity | null => {
 					fedibird: "http://fedibird.com/ns#",
 					// vcard
 					vcard: "http://www.w3.org/2006/vcard/ns#",
+					// mia
+					Bite: "https://ns.mia.jetzt/as#Bite",
 				},
 			],
 		},

packages/backend/src/remote/activitypub/resolver.ts

@@ -13,6 +13,7 @@ import {
 	NoteReactions,
 	Polls,
 	Users,
+	Bites,
 } from "@/models/index.js";
 import { parseUri } from "./db-resolver.js";
 import renderNote from "@/remote/activitypub/renderer/note.js";
@@ -25,6 +26,7 @@ import renderFollow from "@/remote/activitypub/renderer/follow.js";
 import { shouldBlockInstance } from "@/misc/should-block-instance.js";
 import { apLogger } from "@/remote/activitypub/logger.js";
 import { In, IsNull, Not } from "typeorm";
+import renderBite from "@/remote/activitypub/renderer/bite.js";
 
 export default class Resolver {
 	private history: Set<string>;
@@ -219,6 +221,10 @@ export default class Resolver {
 					throw new Error("resolveLocal: invalid follow URI");
 				}
 				return renderActivity(renderFollow(follower, followee, url));
+			case "bites":
+				return Bites.findOneByOrFail({ id: parsed.id }).then((bite) =>
+					renderActivity(renderBite(bite)),
+				);
 			default:
 				throw new Error(`resolveLocal: type ${type} unhandled`);
 		}

packages/backend/src/remote/activitypub/type.ts

@@ -322,6 +322,12 @@ export interface IMove extends IActivity {
 	target: IObject | string;
 }
 
+export interface IBite extends IActivity {
+	type: "Bite";
+	actor: string;
+	target: string;
+}
+
 export const isCreate = (object: IObject): object is ICreate =>
 	getApType(object) === "Create";
 export const isDelete = (object: IObject): object is IDelete =>
@@ -354,3 +360,5 @@ export const isFlag = (object: IObject): object is IFlag =>
 	getApType(object) === "Flag";
 export const isMove = (object: IObject): object is IMove =>
 	getApType(object) === "Move";
+export const isBite = (object: IObject): object is IBite =>
+	getApType(object) === "Bite";

packages/backend/src/server/activitypub.ts

@@ -16,6 +16,7 @@ import {
 	Emojis,
 	NoteReactions,
 	FollowRequests,
+	Bites,
 } from "@/models/index.js";
 import type { ILocalUser, User } from "@/models/entities/user.js";
 import { renderLike } from "@/remote/activitypub/renderer/like.js";
@@ -35,6 +36,7 @@ import Outbox, { packActivity } from "./activitypub/outbox.js";
 import { serverLogger } from "./index.js";
 import config from "@/config/index.js";
 import Koa from "koa";
+import renderBite from "@/remote/activitypub/renderer/bite.js";
 
 // Init router
 const router = new Router();
@@ -480,4 +482,33 @@ router.get("/follows/:followRequestId", async (ctx: Router.RouterContext) => {
 	setResponseType(ctx);
 });
 
+// bite
+router.get("/bites/:biteId", async (ctx: Router.RouterContext) => {
+	const verify = await checkFetch(ctx.req);
+	if (verify !== 200) {
+		ctx.status = verify;
+		return;
+	}
+
+	const bite = await Bites.findOne({
+		where: { id: ctx.params.biteId },
+		relations: ["targetUser", "targetBite"],
+	});
+
+	if (bite === null) {
+		ctx.status = 404;
+		return;
+	}
+
+	const meta = await fetchMeta();
+	if (meta.secureMode || meta.privateMode) {
+		ctx.set("Cache-Control", "private, max-age=0, must-revalidate");
+	} else {
+		ctx.set("Cache-Control", "public, max-age=180");
+	}
+
+	ctx.body = renderActivity(await renderBite(bite));
+	setResponseType(ctx);
+});
+
 export default router;

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

@@ -334,6 +334,8 @@ import * as ep___users_show from "./endpoints/users/show.js";
 import * as ep___users_stats from "./endpoints/users/stats.js";
 import * as ep___fetchRss from "./endpoints/fetch-rss.js";
 import * as ep___admin_driveCapOverride from "./endpoints/admin/drive-capacity-override.js";
+import * as ep___bites_create from "./endpoints/bites/create.js";
+import * as ep___bites_show from "./endpoints/bites/show.js";
 
 //Iceshrimp Move
 import * as ep___i_move from "./endpoints/i/move.js";
@@ -682,6 +684,8 @@ const eps = [
 	["admin/drive-capacity-override", ep___admin_driveCapOverride],
 	["fetch-rss", ep___fetchRss],
 	["get-sounds", ep___sounds],
+	["bites/create", ep___bites_create],
+	["bites/show", ep___bites_show],
 ];
 
 export interface IEndpointMeta {

packages/backend/src/server/api/endpoints/bites/create.ts

@@ -0,0 +1,37 @@
+import { Bites } from "@/models/index.js";
+import define from "../../define.js";
+import { createBite } from "@/services/create-bite.js";
+import { MINUTE } from "@/const.js";
+
+export const meta = {
+	tags: ["bites"],
+
+	requireCredential: true,
+
+	limit: {
+		duration: MINUTE,
+		max: 30,
+	},
+
+	res: {
+		type: "object",
+		optional: false,
+		nullable: false,
+		ref: "Bite",
+	},
+} as const;
+
+export const paramDef = {
+	type: "object",
+	properties: {
+		targetType: { type: "string", enum: ["user", "bite"] },
+		targetId: { type: "string", format: "misskey:id" },
+	},
+	required: ["targetType", "targetId"],
+} as const;
+
+export default define(meta, paramDef, async (ps, user) => {
+	const biteId = await createBite(user, ps.targetType, ps.targetId);
+
+	return await Bites.pack(biteId, user);
+});

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

@@ -0,0 +1,25 @@
+import { Bites } from "@/models/index.js";
+import define from "../../define.js";
+
+export const meta = {
+	tags: ["bites"],
+
+	res: {
+		type: "object",
+		optional: false,
+		nullable: false,
+		ref: "Bite",
+	},
+} as const;
+
+export const paramDef = {
+	type: "object",
+	properties: {
+		biteId: { type: "string", format: "misskey:id" },
+	},
+	required: ["biteId"],
+} as const;
+
+export default define(meta, paramDef, async (ps, user) => {
+	return await Bites.pack(ps.biteId, user);
+});

packages/backend/src/services/create-bite.ts

@@ -0,0 +1,74 @@
+import { genId } from "@/misc/gen-id.js";
+import { Bites, Users } from "@/models/index.js";
+import { Bite } from "@/models/entities/bite.js";
+import { User } from "@/models/entities/user.js";
+import { renderActivity } from "@/remote/activitypub/renderer/index.js";
+import renderBite from "@/remote/activitypub/renderer/bite.js";
+import { deliverToUser } from "@/remote/activitypub/deliver-manager.js";
+import { createNotification } from "./create-notification.js";
+
+export async function createBite(
+	sender: User,
+	targetType: Bite["targetType"],
+	targetId: string,
+	remoteUri: Bite["uri"] = null,
+	createdAt: Date | null = null,
+): Promise<Bite["id"]> {
+	const id = genId();
+
+	const insert = {
+		id,
+		createdAt: createdAt ?? new Date(),
+		userId: sender.id,
+		targetType,
+		replied: false,
+		uri: remoteUri,
+	} as any;
+
+	switch (targetType) {
+		case "user":
+			insert.targetUserId = targetId;
+			break;
+		case "bite":
+			insert.targetBiteId = targetId;
+			break;
+	}
+
+	await Bites.insert(insert);
+
+	const bite = await Bites.findOneOrFail({
+		where: { id },
+		relations: ["targetUser", "targetBite"],
+	});
+
+	let deliverTarget: User;
+
+	switch (targetType) {
+		case "user":
+			deliverTarget = bite.targetUser!;
+			break;
+		case "bite":
+			await Bites.update({ id: bite.targetBiteId! }, { replied: true });
+			deliverTarget =
+				bite.targetBite!.user ??
+				(await Users.findOneByOrFail({ id: bite.targetBite!.userId }));
+			break;
+	}
+
+	if (Users.isLocalUser(sender) && Users.isRemoteUser(deliverTarget)) {
+		await deliverToUser(
+			sender,
+			renderActivity(await renderBite(bite)),
+			deliverTarget,
+		);
+	}
+
+	if (Users.isLocalUser(deliverTarget)) {
+		await createNotification(deliverTarget.id, "bite", {
+			notifierId: sender.id,
+			biteId: bite.id,
+		});
+	}
+
+	return id;
+}

packages/backend/src/services/create-notification.ts

@@ -25,7 +25,7 @@ export async function createNotification(
 
 	if (
 		data.notifierId &&
-		["mention", "reply", "renote", "quote", "reaction"].includes(type)
+		["mention", "reply", "renote", "quote", "reaction", "bite"].includes(type)
 	) {
 		const notifier = await Users.findOneBy({ id: data.notifierId });
 		// suppress if the notifier does not exist or is silenced.

packages/backend/src/types.ts

@@ -11,6 +11,7 @@ export const notificationTypes = [
 	"followRequestAccepted",
 	"groupInvited",
 	"app",
+	"bite",
 ] as const;
 
 export const noteVisibilities = [

packages/client/src/components/MkBiteButton.vue

@@ -0,0 +1,124 @@
+<template>
+	<button class="kpoogebi _button bite-button" :class="{
+		full,
+		large,
+		wait,
+		active: hasBittenBack,
+	}" :disabled="wait" @click.stop="onClick" :aria-label="`bite ${user.name || user.username} back`">
+		<span>{{ i18n.ts.biteBack }}</span><i class="ph-tooth ph-bold ph-lg"></i>
+	</button>
+</template>
+
+<script lang="ts" setup>
+import type * as Misskey from "iceshrimp-js";
+import * as os from "@/os";
+import { i18n } from "@/i18n";
+
+const props = withDefaults(
+	defineProps<{
+		user: Misskey.entities.UserLite,
+		bite: Misskey.entities.Bite,
+		full: boolean,
+		large: boolean,
+	}>(),
+	{
+		full: false,
+		large: false
+	},
+);
+
+let wait = $ref(false);
+let hasBittenBack = $ref<boolean>(props.bite.replied);
+
+async function onClick() {
+	wait = true;
+
+	try {
+		await os.api("bites/create", {
+			targetType: "bite",
+			targetId: props.bite.id,
+		});
+		hasBittenBack = true;
+	} finally {
+		wait = false;
+	}
+}
+</script>
+
+<style lang="scss" scoped>
+.bite-button {
+	position: relative;
+	display: inline-flex;
+	align-items: center;
+	justify-content: center;
+	font-weight: bold;
+	color: var(--accent);
+	border: solid 1px var(--accent);
+	padding: 0;
+	font-size: 16px;
+	width: 2em;
+	height: 2em;
+	border-radius: 100px;
+	background: var(--bg);
+	vertical-align: middle;
+	margin-left: 0.5em;
+
+	&.full {
+		padding: 0.2em 0.7em;
+		width: auto;
+		font-size: 14px;
+	}
+
+	&.large {
+		font-size: 16px;
+		height: 38px;
+		padding: 0 12px 0 16px;
+	}
+
+	&:not(.full) {
+		width: 31px;
+
+		span {
+			display: none;
+		}
+	}
+
+	&:focus-visible {
+		&:after {
+			content: "";
+			pointer-events: none;
+			position: absolute;
+			top: -5px;
+			right: -5px;
+			bottom: -5px;
+			left: -5px;
+			border: 2px solid var(--focus);
+			border-radius: 32px;
+		}
+	}
+
+	&.active {
+		color: var(--fgOnAccent);
+		background: var(--accent);
+
+		&:hover {
+			background: var(--accentLighten);
+			border-color: var(--accentLighten);
+		}
+
+		&:active {
+			background: var(--accentDarken);
+			border-color: var(--accentDarken);
+		}
+	}
+
+	&.wait {
+		cursor: wait !important;
+		opacity: 0.7;
+	}
+
+	>span {
+		margin-right: 6px;
+	}
+}
+</style>

packages/client/src/components/MkNotification.vue

@@ -222,6 +222,21 @@
 						:hideMenu="true"
 					/></div
 			></span>
+			<span
+				v-if="notification.type === 'bite'"
+				class="text"
+				style="opacity: 0.7">{{
+					notification.bite.targetType === 'user'
+						? i18n.ts.bitYou
+						: i18n.ts.bitYouBack
+					}}
+				<div v-if="full">
+					<MkBiteButton
+						:user="notification.user"
+						:bite="notification.bite"
+						:full="true"
+					/></div
+			></span>
 			<span
 				v-if="notification.type === 'followRequestAccepted'"
 				class="text"
@@ -277,6 +292,7 @@ import { ref, onMounted, onUnmounted, watch } from "vue";
 import * as misskey from "iceshrimp-js";
 import XReactionIcon from "@/components/MkReactionIcon.vue";
 import MkFollowButton from "@/components/MkFollowButton.vue";
+import MkBiteButton from "@/components/MkBiteButton.vue";
 import XReactionTooltip from "@/components/MkReactionTooltip.vue";
 import { getNoteSummary } from "@/scripts/get-note-summary";
 import { notePage } from "@/filters/note";

packages/client/src/scripts/get-user-menu.ts

@@ -59,6 +59,13 @@ export function getUserMenu(user, router: Router = mainRouter) {
 		});
 	}
 
+	async function bite() {
+		await os.apiWithDialog("bites/create", {
+			targetType: "user",
+			targetId: user.id,
+		});
+	}
+
 	async function toggleMute() {
 		if (user.isMuted) {
 			os.apiWithDialog("mute/delete", {
@@ -310,6 +317,13 @@ export function getUserMenu(user, router: Router = mainRouter) {
 					action: inviteGroup,
 			  }
 			: undefined,
+		meId !== user.id
+			? {
+					icon: "ph-tooth ph-bold ph-lg",
+					text: i18n.ts.bite,
+					action: bite,
+			  }
+			: undefined,
 		null,
 		{
 			icon: user.isRenoteMuted

packages/iceshrimp-js/src/consts.ts

@@ -11,6 +11,7 @@ export const notificationTypes = [
 	"followRequestAccepted",
 	"groupInvited",
 	"app",
+	"bite",
 ] as const;
 
 export const noteVisibilities = [

packages/iceshrimp-js/src/entities.ts

@@ -250,6 +250,12 @@ export type Notification = {
 			body: string;
 			icon?: string | null;
 	  }
+	| {
+			type: "bite";
+			user: User;
+			userId: User["id"];
+			bite: Bite;
+		}
 );
 
 export type MessagingMessage = {
@@ -492,3 +498,10 @@ export type UserSorting =
 	| "+updatedAt"
 	| "-updatedAt";
 export type OriginType = "combined" | "local" | "remote";
+
+export type Bite = {
+	id: ID;
+	user: UserLite,
+	targetType: "user" | "bite",
+	target: UserLite | Bite,
+};