ws:// protocol not supported

[warent]

AngularClass/angular-websocket requires a url to use the ws:// protocol. If I try to define this via format: 'url' it spews.

[pdehaan]

Ref: #93

I think you can just use a custom validator.isURL() format and allow ws:// and wss:// protocols. Maybe something like @madarche's #93 (comment):

const validator = require('validator');
convict.addFormat({
    name: 'ws-uri',
    validate: function(val) {
        if (!validator.isURL(val, {protocols: ['ws', 'wss']})) {
            throw new Error('must be a web socket URI');
        }
    }
});

var conf = convict({
    uri: {
        doc: 'web socket URI',
        format: 'ws-uri',
        default: ''
    }
});
conf.load({uri: 'ws://localhost:27017/blah'});
conf.validate({strict: true});