misskey/src/server/api/authenticate.ts

import isNativeToken from './common/is-native-token';
import { User } from '../../models/entities/user';
import { Users, AccessTokens, Apps } from '../../models';
import { ensure } from '../../prelude/ensure';

type App = {
	permission: string[];
};

export default async (token: string): Promise<[User | null | undefined, App | null | undefined]> => {
	if (token == null) {
		return [null, null];
	}

	if (isNativeToken(token)) {
		// Fetch user
		const user = await Users
			.findOne({ token });

		if (user == null) {
			throw new Error('user not found');
		}

		return [user, null];
	} else {
		const accessToken = await AccessTokens.findOne({
			hash: token.toLowerCase()
		});

		if (accessToken == null) {
			throw new Error('invalid signature');
		}

		AccessTokens.update(accessToken.id, {
			lastUsedAt: new Date(),
		});

		const user = await Users
			.findOne({
				id: accessToken.userId // findOne(accessToken.userId) のように書かないのは後方互換性のため
			});

		if (accessToken.appId) {
			const app = await Apps
				.findOne(accessToken.appId).then(ensure);

			return [user, {
				permission: app.permission
			}];
		} else {
			return [user, {
				permission: accessToken.permission
			}];
		}
	}
};