Marvin

Introduction

Marvin is a user-friendly bot for Slack. Marvin takes its name from everyone's favorite Paranoid Android from The Hitchhiker's Guide to the Galaxy.

At the moment it works with an outgoing webhook and the Slack API.

Setup

Enable outgoing webhook

On the integrations page on the Slack website add a new outgoing webhook. Go to the webhook setting and choose Any for the channel. The trigger word is marvin or you pick a name yourself if you want your bot to have a different name. In the URL text area you specifiy the URL of a publicly accessible server where your bot will be running (e.g. https://marvin.yoursite.com).

Get a Slack API token

The last thing you need to do is get an API token so you can communicate with the Slack API. Go to https://api.slack.com and under the Authentication paragraph you can create a API token. Make sure you copy this token as you need it for the next step.

Install Marvin

Clone the repository:

git clone [email protected]:the-marvin-bot/marvin.git

Install the dependencies:

composer update

Webserver config

The Slack API token should be set as an environment variable on your system. The easiest way is to set them in your virtual host config.

Apache

<VirtualHost *:80>
        ServerName marvin.yourdomain.com

        DocumentRoot /var/www/marvin.yourdomain.com/public

        SetEnv SLACK_TOKEN "xoxp-XXXXXXXXXX-XXXXXXXXXX-XXXXXXXXXX-XXXXXX"
        SetEnv SLACK_ICON "http://marvin.yourdomain.com/marvin.png"

        <Directory />
                Options FollowSymLinks
                AllowOverride None
        </Directory>

        <Directory /var/www/marvin.yourdomain.com/public/>
                Options Indexes FollowSymLinks MultiViews
                AllowOverride All
                Order allow,deny
                allow from all
        </Directory>
</VirtualHost>

Plugins

Marvin ships with a couple of plugins enabled by default. It's easy to enable new plugins or disable the ones you don't need. To enable a plugin you can type the following command from the root of the project:

php marvin plugin:enable

You will be prompted to enter the name of the plugin you want to enable and that's all there is to it.

To disable a plugin you use the following command:

php marvin plugin:disable

Marvin will show you a list of enabled plugins and you can pick the one you want to disable.

Create your own plugin

Creating your own plugin is not as hard as you might think. First of all you start with the create plugin command:

php marvin plugin:create

You'll be asked to answer a few questions to setup your plugin. Once you've answered all the questions a workbench directory will be created in the root of your project. It contains a composer.json file and a stub class of your plugin. Say you created a plugin called Weather with the namespace YourName\Marvin\Plugin then your stub class will be Weather.php which can be found in the workbench/src/YourName/Marvin/Plugin directory.

Below is an example of what the stub looks like:

<?php

namespace YourName\Marvin\Plugin;

use Marvin\Lib\BasePlugin;

class Weather extends BasePlugin
{
    public function trigger()
    {
        $this->trigger = 'YOUR_TRIGGER';
    }

    public function description()
    {
        $this->addDescriptionLine($this->trigger, 'YOUR_DESCRIPTION');
    }

    public function config()
    {
        //$this->addConfigVariable('KEY', 'VALUE');
    }

    public function execute($parameters)
    {
        return $this->reply('YOUR_REPLY');
    }
}

The trigger, description and execute functions are all required and are pretty self explanatory.

The config function is an optional function that you can use to specify configuration variables like username, password, API key, etc. that is needed by your plugin. If you decide to use config variables then a user who installs your plugin will have to run php marvin config:publish after enabling your plugin. This will create a folder with the name of your plugin in the config directory. Inside this directory is json file where the user can fill in the config variables.

Once you are happy with your plugin you probably want to put it in its own git repository. Well luckily we also thought of this! First of all you create your repo on github, bitbucket, etc. Then run the following command:

php marvin plugin:finish

This will ask you to supply the url to your git repo and a version number. Once your plugin is successfully commited you'll be asked if you want to remove the workbench directory.

Enable your plugin

To enable your plugin you have to add the url to your git repo to the repositories array in your composer.json file:

"repositories": [
    {
        "type": "vcs",
        "url":  "[email protected]:username/plugin-name.git"
    }
]

This will enable you to install your plugin by adding it to your required packages:

"require": {
    ...
    "username/plugin-name": "~1.0"
}

Lastly you can use the php marvin plugin:enable command to enable your very own plugin for use with Marvin.

Submit your plugin to the Marvin plugin repository

Coming soon!

Development

Using PHP's built-in web server

For debugging purposes you can use PHP's built-in web server to serve up the application. Use the following command to start up Marvin:

php marvin serve

This is start the development server on http://localhost:8000. You can optionally pass a port:

php marvin serve --port=8765

To test if your development server is running you can use the following CURL command:

curl -X POST -d 'channel_name=general&text=marvin+laws&trigger_word=marvin' http://localhost:8000

This will post The Three Laws of Robotics in the #general channel of your Slack organisation. To test other commands just replace text=marvin+laws with the trigger for your plugin, e.g. text=marvin+weather.