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

app/components/Sidebar/components/CollectionLink.js

@@ -65,6 +65,7 @@ class CollectionLink extends React.Component<Props> {
               <DocumentLink
                 key={document.id}
                 document={document}
+                collection={collection}
                 activeDocument={activeDocument}
                 prefetchDocument={prefetchDocument}
                 depth={1.5}

app/components/Sidebar/components/Collections.js

@@ -34,10 +34,10 @@ class Collections extends React.Component<Props> {
 
   @keydown('n')
   goToNewDocument() {
-    const activeCollection = this.props.collections.active;
-    if (!activeCollection) return;
+    const { activeCollectionId } = this.props.ui;
+    if (!activeCollectionId) return;
 
-    this.props.history.push(newDocumentUrl(activeCollection));
+    this.props.history.push(newDocumentUrl(activeCollectionId));
   }
 
   render() {

app/components/Sidebar/components/DocumentLink.js

@@ -5,11 +5,13 @@ import styled from 'styled-components';
 import Document from 'models/Document';
 import SidebarLink from './SidebarLink';
 import DropToImport from 'components/DropToImport';
+import Collection from 'models/Collection';
 import Flex from 'shared/components/Flex';
 import { type NavigationNode } from 'types';
 
 type Props = {
   document: NavigationNode,
+  collection?: Collection,
   activeDocument: ?Document,
   activeDocumentRef?: (?HTMLElement) => *,
   prefetchDocument: (documentId: string) => Promise<void>,
@@ -29,6 +31,7 @@ class DocumentLink extends React.Component<Props> {
   render() {
     const {
       document,
+      collection,
       activeDocument,
       activeDocumentRef,
       prefetchDocument,
@@ -39,7 +42,9 @@ class DocumentLink extends React.Component<Props> {
       activeDocument && activeDocument.id === document.id;
     const showChildren = !!(
       activeDocument &&
-      (activeDocument.pathToDocument
+      collection &&
+      (collection
+        .pathToDocument(activeDocument)
         .map(entry => entry.id)
         .includes(document.id) ||
         isActiveDocument)
@@ -69,6 +74,7 @@ class DocumentLink extends React.Component<Props> {
                 {document.children.map(childDocument => (
                   <DocumentLink
                     key={childDocument.id}
+                    collection={collection}
                     document={childDocument}
                     activeDocument={activeDocument}
                     prefetchDocument={prefetchDocument}