Sinusbot: Song blacklist/ban

/*

$$\                                               $$\
\__|                                              $$ |
$$\  $$$$$$\   $$$$$$\   $$$$$$\  $$$$$$$\   $$$$$$$ |$$\  $$\  $$\  $$$$$$\   $$$$$$\
$$ |$$  __$$\ $$  __$$\ $$  __$$\ $$  __$$\ $$  __$$ |$$ | $$ | $$ |$$  __$$\ $$  __$$\
$$ |$$ |  \__|$$ /  $$ |$$$$$$$$ |$$ |  $$ |$$ /  $$ |$$ | $$ | $$ |$$$$$$$$ |$$ |  \__|
$$ |$$ |      $$ |  $$ |$$   ____|$$ |  $$ |$$ |  $$ |$$ | $$ | $$ |$$   ____|$$ |
$$ |$$ |      \$$$$$$$ |\$$$$$$$\ $$ |  $$ |\$$$$$$$ |\$$$$$\$$$$  |\$$$$$$$\ $$ |
\__|\__|       \____$$ | \_______|\__|  \__| \_______| \_____\____/  \_______|\__|
              $$\   $$ |
              \$$$$$$  |
               \______/

  Copyright 2017 Jonas Bögle, all rights reserved.
*/

registerPlugin({
    name: 'Song blacklist/ban',
    version: '1.0',
    description: 'Prevents users  from playing songs that contain specific strings in their title',
    author: 'irgendwer / Jonas <dev@sandstorm-projects.de>',
    backends: ['ts3', 'discord'],
    vars: [
        {
            name: 'blacklist',
            title: 'Songs that contain one of these strings are banned:',
            type: 'strings'
        }
    ]
}, function (s, config, info) {
    // set to true for more output
    var DEBUG = true

    // include modules
    var event = require('event')
    var engine = require('engine')
    var media = require('media')

    event.on('track', function(track) {
        if (config.blacklist.some(function(str) {
            return track.title().toLowerCase().indexOf(str.toLowerCase()) !== -1
        })) {
            logmsg('D', 'skipping blacklisted song...')
            stop()

            // this method doesn't work for some reason:
            media.playNext(0)
        }
    })

    /**
     * Loggs a message, requires engine
     *
     * @param {String} level DEBUG, INFO or ERROR
     * @param {String} msg Message
     */
    function logmsg(level, msg) {
        switch (level) {
            case 'D':
            case 'DBG':
                level = 'DEBUG'
                break
            case 'I':
            case 'INF':
                level = 'INFO'
                break
            case 'E':
            case 'ERR':
                level = 'ERROR'
                break
            case 'W':
            case 'WARN':
                level = 'WARN'
                break
        }

        if (level == 'DEBUG' || level == 'INFO' || level == 'ERROR' || level == 'WARN') {
            if (DEBUG || level != 'DEBUG') {
                engine.log('[' + level + '] ' + msg)
            }
        } else {
            engine.log('[ERROR] unknown loglevel "' + level + '"; msg: ' + msg)
        }
    }

    // log info on startup
    logmsg('I', 'debug messages are ' + (DEBUG ? 'en' : 'dis') + 'abled')
    logmsg('I', info.name + ' v' + info.version + ' by ' + info.author + ' loaded successfully!')
})