<?php

class Swift_Transport_Esmtp_AuthHandler implements Swift_Transport_EsmtpHandler
{
    /**
     * Authenticators available to process the request.
     *
     * @var Swift_Transport_Esmtp_Authenticator[]
     */
    private $authenticators = [];

    /**
     * The username for authentication.
     *
     * @var string
     */
    private $username;

    /**
     * The password for authentication.
     *
     * @var string
     */
    private $password;

    /**
     * The auth mode for authentication.
     *
     * @var string
     */
    private $auth_mode;

    /**
     * The ESMTP AUTH parameters available.
     *
     * @var string[]
     */
    private $esmtpParams = [];

    /**
     * Create a new AuthHandler with $authenticators for support.
     *
     * @param Swift_Transport_Esmtp_Authenticator[] $authenticators
     */
    public function __construct(array $authenticators)
    {
        $this->setAuthenticators($authenticators);
    }

    /**
     * Set the Authenticators which can process a login request.
     *
     * @param Swift_Transport_Esmtp_Authenticator[] $authenticators
     */
    public function setAuthenticators(array $authenticators)
    {
        $this->authenticators = $authenticators;
    }

    /**
     * Get the Authenticators which can process a login request.
     *
     * @return Swift_Transport_Esmtp_Authenticator[]
     */
    public function getAuthenticators()
    {
        return $this->authenticators;
    }

    /**
     * Set the username to authenticate with.
     *
     * @param string $username
     */
    public function setUsername($username)
    {
        $this->username = $username;
    }

    /**
     * Get the username to authenticate with.
     *
     * @return string
     */
    public function getUsername()
    {
        return $this->username;
    }

    /**
     * Set the password to authenticate with.
     *
     * @param string $password
     */
    public function setPassword($password)
    {
        $this->password = $password;
    }

    /**
     * Get the password to authenticate with.
     *
     * @return string
     */
    public function getPassword()
    {
        return $this->password;
    }

    /**
     * Set the auth mode to use to authenticate.
     *
     * @param string $mode
     */
    public function setAuthMode($mode)
    {
        $this->auth_mode = $mode;
    }

    /**
     * Get the auth mode to use to authenticate.
     *
     * @return string
     */
    public function getAuthMode()
    {
        return $this->auth_mode;
    }

    /**
     * Get the name of the ESMTP extension this handles.
     *
     * @return string
     */
    public function getHandledKeyword()
    {
        return 'AUTH';
    }

    /**
     * Set the parameters which the EHLO greeting indicated.
     *
     * @param string[] $parameters
     */
    public function setKeywordParams(array $parameters)
    {
        $this->esmtpParams = $parameters;
    }

    /**
     * Runs immediately after a EHLO has been issued.
     *
     * @param Swift_Transport_SmtpAgent $agent to read/write
     */
    public function afterEhlo(Swift_Transport_SmtpAgent $agent)
    {
        if ($this->username) {
            $count = 0;
            $errors = [];
            foreach ($this->getAuthenticatorsForAgent() as $authenticator) {
                if (in_array(strtolower($authenticator->getAuthKeyword() ?? ''), array_map('strtolower', $this->esmtpParams))) {
                    ++$count;
                    try {
                        if ($authenticator->authenticate($agent, $this->username, $this->password)) {
                            return;
                        }
                    } catch (Swift_TransportException $e) {
                        // keep the error message, but tries the other authenticators
                        $errors[] = [$authenticator->getAuthKeyword(), $e->getMessage()];
                    }
                }
            }

            $message = 'Failed to authenticate on SMTP server with username "'.$this->username.'" using '.$count.' possible authenticators.';
            foreach ($errors as $error) {
                $message .= ' Authenticator '.$error[0].' returned '.$error[1].'.';
            }
            throw new Swift_TransportException($message);
        }
    }

    /**
     * Not used.
     */
    public function getMailParams()
    {
        return [];
    }

    /**
     * Not used.
     */
    public function getRcptParams()
    {
        return [];
    }

    /**
     * Not used.
     */
    public function onCommand(
        Swift_Transport_SmtpAgent $agent,
        $command,
        $codes = [],
        &$failedRecipients = null,
        &$stop = false,
    ) {
    }

    /**
     * Returns +1, -1 or 0 according to the rules for usort().
     *
     * This method is called to ensure extensions can be execute in an appropriate order.
     *
     * @param string $esmtpKeyword to compare with
     *
     * @return int
     */
    public function getPriorityOver($esmtpKeyword)
    {
        return 0;
    }

    /**
     * Returns an array of method names which are exposed to the Esmtp class.
     *
     * @return string[]
     */
    public function exposeMixinMethods()
    {
        return ['setUsername', 'getUsername', 'setPassword', 'getPassword', 'setAuthMode', 'getAuthMode'];
    }

    /**
     * Not used.
     */
    public function resetState()
    {
    }

    /**
     * Returns the authenticator list for the given agent.
     *
     * @return array
     */
    protected function getAuthenticatorsForAgent()
    {
        if (!$mode = strtolower($this->auth_mode ?? '')) {
            return $this->authenticators;
        }

        foreach ($this->authenticators as $authenticator) {
            if (strtolower($authenticator->getAuthKeyword() ?? '') == $mode) {
                return [$authenticator];
            }
        }

        throw new Swift_TransportException('Auth mode '.$mode.' is invalid');
    }
}
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