firefly-iii/app/Support/Authentication/RemoteUserProvider.php

<?php
declare(strict_types=1);

namespace FireflyIII\Support\Authentication;


use FireflyIII\Exceptions\FireflyException;
use FireflyIII\User;
use Illuminate\Contracts\Auth\Authenticatable;
use Illuminate\Contracts\Auth\UserProvider;
use Illuminate\Foundation\Application;
use Log;
use Str;

/**
 * Class RemoteUserProvider
 */
class RemoteUserProvider implements UserProvider
{

    /**
     * @inheritDoc
     */
    public function retrieveByCredentials(array $credentials)
    {
        Log::debug(sprintf('Now at %s', __METHOD__));
        throw new FireflyException(sprintf('Did not implement %s', __METHOD__));
    }

    /**
     * @inheritDoc
     */
    public function retrieveById($identifier): User
    {
        Log::debug(sprintf('Now at %s(%s)', __METHOD__, $identifier));
        $user = User::where('email', $identifier)->first();
        if (null === $user) {
            Log::debug(sprintf('User with email "%s" not found. Will be created.', $identifier));
            $user = User::create(
                [
                    'blocked'      => false,
                    'blocked_code' => null,
                    'email'        => $identifier,
                    'password'     => bcrypt(Str::random(64)),
                ]
            );
        }
        Log::debug(sprintf('Going to return user #%d (%s)', $user->id, $user->email));

        return $user;
    }

    /**
     * @inheritDoc
     */
    public function retrieveByToken($identifier, $token)
    {
        Log::debug(sprintf('Now at %s', __METHOD__));
        throw new FireflyException(sprintf('Did not implement %s', __METHOD__));
    }

    /**
     * @inheritDoc
     */
    public function updateRememberToken(Authenticatable $user, $token)
    {
        Log::debug(sprintf('Now at %s', __METHOD__));
        throw new FireflyException(sprintf('Did not implement %s', __METHOD__));
    }

    /**
     * @inheritDoc
     */
    public function validateCredentials(Authenticatable $user, array $credentials)
    {
        Log::debug(sprintf('Now at %s', __METHOD__));
        throw new FireflyException(sprintf('Did not implement %s', __METHOD__));
    }
}