Websocket Support (#937)

* Atom / RSS meta link

* Spike

* Feeling good about this spike now

* Remove document.collection

* Remove koa.ctx from all presenters to make them portable outside requests

* Remove full serialized model from events
Move events.add to controllers for now, will eventually be in commands

* collections.create event
parentDocument -> parentDocumentId

* Fix up deprecated tests

* Fixed: Doc creation

* documents.move

* Handle collection deleted

* 💚

* Authorize room join requests

* Move starred data structure
Account for documents with no context on sockets

* Add socket.io-redis

* Add WEBSOCKETS_ENABLED env variable to disable websockets entirely for self hosted
New installations will default to true, existing installations to false

* 💚 No need for promise response here

* Reload notice

server/models/Document.js

@@ -10,7 +10,6 @@ import removeMarkdown from '@tommoor/remove-markdown';
 import isUUID from 'validator/lib/isUUID';
 import { Collection, User } from '../models';
 import { DataTypes, sequelize } from '../sequelize';
-import events from '../events';
 import parseTitle from '../../shared/utils/parseTitle';
 import unescape from '../../shared/utils/unescape';
 import Revision from './Revision';
@@ -289,14 +288,9 @@ Document.addHook('afterCreate', async model => {
   await collection.addDocumentToStructure(model);
   model.collection = collection;
 
-  events.add({ name: 'documents.create', model });
   return model;
 });
 
-Document.addHook('afterDestroy', model =>
-  events.add({ name: 'documents.delete', model })
-);
-
 // Instance methods
 
 // Note: This method marks the document and it's children as deleted
@@ -353,7 +347,6 @@ Document.prototype.publish = async function() {
   await this.save();
   this.collection = collection;
 
-  events.add({ name: 'documents.publish', model: this });
   return this;
 };
 
@@ -367,7 +360,6 @@ Document.prototype.archive = async function(userId) {
 
   await this.archiveWithChildren(userId);
 
-  events.add({ name: 'documents.archive', model: this });
   return this;
 };
 
@@ -397,7 +389,6 @@ Document.prototype.unarchive = async function(userId) {
   this.lastModifiedById = userId;
   await this.save();
 
-  events.add({ name: 'documents.unarchive', model: this });
   return this;
 };
 
@@ -417,7 +408,6 @@ Document.prototype.delete = function(options) {
 
     await this.destroy({ transaction, ...options });
 
-    events.add({ name: 'documents.delete', model: this });
     return this;
   });
 };