This is a simple Slack public invitation plugin for Craft CMS.
To make this plugin work, you need to fill in the three values in the config.php file.
team is the subdomain slug for your Slack team. So in the URL http://example.slack.com, it's example.
token is an API Token for an admin user. You can generate one here.
channels are a comma-separated list of channel IDs. You can get those IDs by going to this page and pressing the Test Method button. It'll display a nice list of your channels.
{% set success = craft.session.getFlash('slacksuccess', false) %}
{% if success or craft.request.getQuery('success') %}
<p>Signed up!</p>
{% else %}
<form method="post" accept-charset="UTF-8">
{{ getCsrfInput() }}
<input type="hidden" name="action" value="slackInvite/sendInvite">
<div>
<input type="text" name="name" value="{{ slack is defined ? slack.name }}" placeholder="Name">
<input type="email" name="email" value="{{ slack is defined ? slack.email }}" placeholder="Email">
<input class="submit" type="submit" value="Request an invite">
</div>
{% if slack is defined and slack.hasErrors() %}
<div>
<p>{{ slack.getAllErrors()|join('<br>')|raw }}</p>
</div>
{% endif %}
</form>
{% endif %}