user-augmented-token-provider.ts

/*
This file is part of botten-nappet -- a Twitch bot and streaming tool.
<https://joelpurra.com/projects/botten-nappet/>

Copyright (c) 2018 Joel Purra <https://joelpurra.com/>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

import {
    autoinject,
} from "aurelia-framework";
import {
    assert,
} from "check-types";

import IAugmentedToken from "@botten-nappet/interface-shared-twitch/src/authentication/iaugmented-token";

import UserNameProvider from "./user-name-provider";
import UserTokenManager from "./user-token-manager";

@autoinject
export default class UserAugmentedTokenProvider {
    constructor(
        private readonly userNameProvider: UserNameProvider,
        private readonly userTokenManager: UserTokenManager,
    ) {
        assert.hasLength(arguments, 2);
        assert.equal(typeof userNameProvider, "object");
        assert.equal(typeof userTokenManager, "object");
    }

    public async get(): Promise<IAugmentedToken> {
        assert.hasLength(arguments, 0);

        const username = await this.userNameProvider.get();
        const userAugmentedToken = await this.userTokenManager.get(username);

        // TODO: better null handling.
        if (userAugmentedToken === null) {
            throw new Error("userAugmentedToken is null.");
        }

        return userAugmentedToken;
    }
}