<?php

namespace phpnotify;

use \TypeError as TypeError;

/**
 * That class could be used to authorize by token.
 * 
 * This could be used to authenticate by previously generated token, which
 * is most secure option in most cases. 
 */
class token_authorization extends authorization_method {
    /**
     * This store authorization token.
     * @var string
     */
    private string $token;

    /** 
     * This create new authorization method.
     * 
     * This create new authorization method from given authorization token.
     * It check that token is not blank and also triming it. When token is
     * empty, then raise TypeError.
     *
     * @throws TypeError When given token is empty.
     * 
     * @param string $token Authorization token to use.
     */
    public function __construct(string $token) {
        $this->token = trim($token);

        if (strlen($this->token) === 0) {
            throw new TypeError('Authorization token could not being empty.');
        }
    }

    /**
     * When use authorization by token, header is required.
     * 
     * @return bool It return true, because header is required.
     */
    public function is_header_required(): bool {
        return true;
    }

    /**
     * It return content of the header, with given token.
     *
     * @return string Content of the authorization header.
     */
    public function header_content(): string {
        return 'Bearer '.$this->token;
    }
}