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widenbot

widenbot

A Slack bot and plugin framework for Widen

BuildStatus | Version | Waffle.io


Dockerstart

% docker build -t widen/widenbot .
% docker run -it --rm --name widenbot widen/widenbot

(IMHO, this is the easiest way to get started, and mirrors the way in works in production).

Quickstart

Global Install:

% npm install -g https://github.com/widen/widenbot
% cp config.example.js config.js
% widenbot -c config.js

Local Install (recommended):

% npm install https://github.com/widen/widenbot
% cp config.example.js config.js
% ./node_modules/.bin/widenbot -c config.js

It is recommended to use environment variables for secret data such as API keys and secrets.

Features

  • Plugin framework: easily create new plugins to do anything in response to Slack commands!
  • Webhook framework: send messages to users or channels when another service alerts the bot.
  • Logging: Extensible logging framework. Can send data to loggly, or anywhere really.

Config

The configuration for the bot is stored in a javascript file. That is required by the bot process. This means you can include executable Javscript within the configuration. An example is provided in config.example.js

Usage

The configuration is loaded and interpreted at runtime. A configuration can be provided via the command-line wrapper.

% widenbot --config path/to/config.js

Currently recognized fields are:

  • name: the bot's name
  • icon: the bot's icon. Can be an emoji ("👻") or a URL.
  • repl: whether to launch an interactive repl with all plugins loaded (default: false)
  • token: Slack's outgoing webook token
  • url: Slack's incoming webhook url
  • dbpath: Path for the database to exist at
  • logging: Options for the logger
    • path: Path for the logs to be written to
    • console (optional): If true logs are written to console too
  • plugins: A hash of plugin names and options. Only plugins in this hash will be recognized.

Format

The configuration file should simply export a plain ol' Javascript object with keys and values corresponding to the desired configuration values.

module.exports = {
    "key": "value",
    "key2": ["array_value1", "array_value2"],
    "env_key": process.env.SECRET_KEY_NAME
};

Brain

The brain is the memory for the bot. This is persisted using levelup and leveldown (leveldb) with an eye for supporting any sort of backend in the future.

Each plugin is given a namespace within the brain to store and retrieve data.

Required options:

  • dbpath: Path for the database to exist at

Plugins

Plugins can extend the bot's ability to respond and act on commands.

Required options:

  • plugins: A hash of plugin names and options hashes. Only plugins in this hash will be recognized.

Example:

plugins: {
    "echo": {}
    "lastfm": {
        "api_key": "BLAHBLAH"
    }
}

The plugin name ("echo" or "lastfm" in the example) must correspond to the filename in ./plugins, or a node module that can be require'd'. The plugin options must be either the empty object {}, or a hash of options. These options will be avaiable to the plugin when it is evaluated so integrators can access API keys and other configuration variables for that plugin.

Logging

widenbot uses bunyan as its logging backend since it integrates nicely with restify (the web framework being used).

Options for logging are specified in the logging hash in the configuration.

  • logging: Options for the logger
    • path: Path for the logs to be written to
    • console (optional): If true logs are written to console too

Plugins

Plugins are easy to create. Just add a new file to ./plugins or install a compatible node module, and add the plugin name and options to the configuration.

Format

A plugin must export a plain ol' Javascript object with a few required properties:

pattern:

this is the regex pattern that incoming commands will be matched against. If a match is found, then this plugin will execute on that command.

respond:

This is the main response handler function for the plugin. It receives a context (which is an object with the command, username, arguments, plugin options, and a reference to the brain).

This function should return a value or a promise. If the value is empty string, then nothing is sent back. If promise is rejected, then nothing is sent back. Else, resolve value is sent back, or the returned value is sent back.

The response can also add attachments to the ctx.outgoing_message as outlined in the Slack API.

Example

# Must export an object '{}'
var Echo = module.exports = {
 
    # metadata
    "name": "Echo", # Plugin's name
    "author": "Mark Feltner", # Plugin author's name
    "description": "Echoes what was just said.", # Plugin description
    "help": "echo", # Plugin help text
 
    # what text the command should match
    "pattern": /^echo$/,
 
    # function that will respond
    # can return a value or a promise
    "respond": function(ctx) {
        return ctx.args;
    }
};

Webhooks

Much like plugins, webhooks are POJOs defined in the configuration.

Rather than match a regex like plugins, webhooks are matched via their name and a url namespace. All webhook requests should follow the format: http://path-to-bot/webhooks/:webhook_name where webhook_name is the name of the hook defined in config.js, and all webhook requests should be POSTs.

respond:

Responds to the webhook. Should follow the signature:

function (context, req, res, next){}

As of right now, must return a promise. The resolve() success value is hash containing:

{
   to: '', // <required> which room '#' or user '@' this message is going to> 
   response: '', // <required> response text, or hash response with 
   attachments
   from: '', // <optional> who is sending the message. defaults to the botname 
   in the config
}

Format

Example

Development

Creating Environment

% git clone git@github.com:Widen/widenbot.git
cd widenbot
% npm i
% cp config.example.js config.js
% vim config.js
% node bin/cli.js -c config.js

Development Scripts

All development build scripts are located in the package.json scripts key.

  • npm run changelog: (WIP) generate a changelog
  • npm run watch: if you have nodemon this will reload on changes
  • npm run lint: Run jshint on code
  • npm run unit-test: Run test suite
  • npm run coverage: Run coverage suiet
  • npm test: Run lint and test suite (this is used by Travis CI)

Contributing Guidelines

See our contributing guidelines