Post to Slack (#603)

* Migrations

* WIP: Integration model, slack perms / hooks

* So so rough it pains me. Building this new model is revealing just how much needs to be refactored

* Working connect and post

* Cleanup UI, upating documents

* Show when slack command is connected

* stash

* 💚

* Add documents.update trigger

* Authorization, tidying

* Fixed integration policy

* pick integration presenter keys

server/api/hooks.js

@@ -2,6 +2,7 @@
 import Router from 'koa-router';
 import { AuthenticationError, InvalidRequestError } from '../errors';
 import { Authentication, Document, User } from '../models';
+import { presentSlackAttachment } from '../presenters';
 import * as Slack from '../slack';
 const router = new Router();
 
@@ -67,14 +68,7 @@ router.post('hooks.slack', async ctx => {
   if (documents.length) {
     const attachments = [];
     for (const document of documents) {
-      attachments.push({
-        color: document.collection.color,
-        title: document.title,
-        title_link: `${process.env.URL}${document.getUrl()}`,
-        footer: document.collection.name,
-        text: document.getSummary(),
-        ts: document.getTimestamp(),
-      });
+      attachments.push(presentSlackAttachment(document));
     }
 
     ctx.body = {