Config.ts

class Config {
    private static _instance: Config;

    public readonly api: {
        port: number
    };

    public readonly database: {
        type: string, host: string, port: number, user: string, password: string, database: string
    };

    public jwtConfig: {
        secret: string; expiresIn: number;
    };

    public permissions: {
        teachingStaff: Array<string>;
    };

    public readonly userPasswordLength: number;
    public readonly userPasswordSaltRounds: number;

    private constructor() {
        this.api = {
            port: Number(process.env.API_PORT)
        };

        this.database = {
            type    : process.env.DATABASE_TYPE,
            host    : process.env.DATABASE_HOST,
            port    : Number(process.env.DATABASE_PORT),
            user    : process.env.DATABASE_USER,
            password: process.env.DATABASE_PASSWORD,
            database: process.env.DATABASE_NAME
        };

        this.jwtConfig = {
            secret   : process.env.JWT_SECRET_KEY,
            expiresIn: Number(process.env.SESSION_TIMEOUT)
        };

        this.permissions = {
            teachingStaff: JSON.parse(process.env.ROLES_WITH_TEACHING_STAFF_PERMISSIONS)
        };

        this.userPasswordLength = Number(process.env.USER_PASSWORD_LENGTH);
        this.userPasswordSaltRounds = Number(process.env.USER_PASSWORD_SALT_ROUNDS);
    }

    public static get instance(): Config {
        if ( !Config._instance ) {
            Config._instance = new Config();
        }

        return Config._instance;
    }
}


export default Config.instance;