slack-auto-invite.php

<?php

/**
 * Define your slack group
 */
$slackGroup = '';

/**
 * Define your slack token
 * @see https://api.slack.com/docs/oauth-test-tokens
 */
$slackToken = '';

/**
 * Slack url data
 */
$slackUrlPrefix = 'https://';
$slackUrlSufix = '.slack.com';
$slackUrlPath = '/api/users.admin.invite?t=1m';

try {
    if (empty($slackGroup) || empty($slackToken)) {
        throw new \ErrorException('Script not configured yet');
    }

    $email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);

    if (!$email) {
        throw new \InvalidArgumentException('Invalid e-mail');
    }
    
    $url = array_reduce(
        [$slackUrlPrefix, $slackGroup, $slackUrlSufix, $slackUrlPath],
        function ($carry, $item) {
            $carry .= $item;
            return $carry;
        }
    );

    $formParams = [
        'email' => $email,
        'channels' => '',
        'first_name' => '',
        'token' => $slackToken,
        'set_active' => 'true',
        '_attempts' => '1',
    ];

    array_walk($formParams, function (&$item, $key) {
        $item = $key . '=' . $item;
    });

    $formData = implode("&", $formParams);

    $curlHandler = curl_init();
    curl_setopt($curlHandler, CURLOPT_URL, $url);
    curl_setopt($curlHandler, CURLOPT_POST, count($formParams));
    curl_setopt($curlHandler, CURLOPT_POSTFIELDS, $formData);
    curl_exec($curlHandler);
    curl_close($curlHandler);

    $response = 'Convite gerado com sucesso, confira seu e-mail';
} catch (\ErrorException $e) {
    $response = 'O registro para este grupo não está ativo no momento';
} catch (\InvalidArgumentException $i) {
    $response = 'E-mail inválido';
} catch (\Throwable $z) {
    $response = 'Algo de muito errado aconteceu';
} finally {
    echo $response;
}