export type AuthToken = string | undefined;

export interface Auth {
    /**
     * Which part of the request do we use to send the auth?
     *
     * @default 'header'
     */
    in?: "header" | "query" | "cookie";
    /**
     * Header or query parameter name.
     *
     * @default 'Authorization'
     */
    name?: string;
    scheme?: "basic" | "bearer";
    type: "apiKey" | "http";
}

export const getAuthToken = async (
    auth: Auth,
    callback: ((auth: Auth) => Promise<AuthToken> | AuthToken) | AuthToken
): Promise<string | undefined> => {
    const token =
        typeof callback === "function" ? await callback(auth) : callback;

    if (!token) {
        return;
    }

    if (auth.scheme === "bearer") {
        return `Bearer ${token}`;
    }

    if (auth.scheme === "basic") {
        return `Basic ${btoa(token)}`;
    }

    return token;
};