misskey/packages/backend/src/server/api/endpoints/users/groups/leave.ts

import define from '../../../define.js';
import { ApiError } from '../../../error.js';
import { UserGroups, UserGroupJoinings } from '@/models/index.js';

export const meta = {
	tags: ['groups', 'users'],

	requireCredential: true,

	kind: 'write:user-groups',

	errors: {
		noSuchGroup: {
			message: 'No such group.',
			code: 'NO_SUCH_GROUP',
			id: '62780270-1f67-5dc0-daca-3eb510612e31',
		},

		youAreOwner: {
			message: 'Your are the owner.',
			code: 'YOU_ARE_OWNER',
			id: 'b6d6e0c2-ef8a-9bb8-653d-79f4a3107c69',
		},
	},
} as const;

export const paramDef = {
	type: 'object',
	properties: {
		groupId: { type: 'string', format: 'misskey:id' },
	},
	required: ['groupId'],
} as const;

// eslint-disable-next-line import/no-default-export
export default define(meta, paramDef, async (ps, me) => {
	// Fetch the group
	const userGroup = await UserGroups.findOne({
		id: ps.groupId,
	});

	if (userGroup == null) {
		throw new ApiError(meta.errors.noSuchGroup);
	}

	if (me.id === userGroup.userId) {
		throw new ApiError(meta.errors.youAreOwner);
	}

	await UserGroupJoinings.delete({ userGroupId: userGroup.id, userId: me.id });
});