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/services/index.js

@@ -0,0 +1,22 @@
+// @flow
+import fs from 'fs-extra';
+import path from 'path';
+
+const services = {};
+
+fs
+  .readdirSync(__dirname)
+  .filter(file => file.indexOf('.') !== 0 && file !== path.basename(__filename))
+  .forEach(name => {
+    const servicePath = path.join(__dirname, name);
+    // $FlowIssue
+    const pkg = require(path.join(servicePath, 'package.json'));
+    // $FlowIssue
+    const hooks = require(servicePath).default;
+    services[pkg.name] = {
+      ...pkg,
+      ...hooks,
+    };
+  });
+
+export default services;

server/services/slack/index.js

@@ -0,0 +1,43 @@
+// @flow
+import type { Event } from '../../events';
+import { Document, Integration } from '../../models';
+import { presentSlackAttachment } from '../../presenters';
+
+const Slack = {
+  on: async (event: Event) => {
+    if (event.name !== 'documents.publish' && event.name !== 'documents.update')
+      return;
+
+    const document = await Document.findById(event.model.id);
+    if (!document) return;
+
+    const integration = await Integration.findOne({
+      where: {
+        teamId: document.teamId,
+        serviceId: 'slack',
+        collectionId: document.atlasId,
+        type: 'post',
+      },
+    });
+    if (!integration) return;
+
+    let text = `${document.createdBy.name} published a new document`;
+
+    if (event.name === 'documents.update') {
+      text = `${document.createdBy.name} updated a document`;
+    }
+
+    await fetch(integration.settings.url, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify({
+        text,
+        attachments: [presentSlackAttachment(document)],
+      }),
+    });
+  },
+};
+
+export default Slack;

server/services/slack/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "slack",
+  "description": "Hook up your Slack to your Outline."
+}