fix: Secure S3 attachments, bump SDK, refactoring

Closes #673

server/api/hooks/file-manager/index.js

@@ -0,0 +1,41 @@
+const LocalFileManager = require('./LocalFileManager');
+const S3FileManager = require('./S3FileManager');
+
+/**
+ * file-manager hook
+ *
+ * @description :: A hook definition. Extends Sails by adding shadow routes, implicit actions,
+ *                 and/or initialization logic.
+ * @docs        :: https://sailsjs.com/docs/concepts/extending-sails/hooks
+ */
+
+module.exports = function defineFileManagerHook(sails) {
+  let instance = null;
+
+  const createInstance = () => {
+    instance = sails.hooks.s3.isActive()
+      ? new S3FileManager(sails.hooks.s3.getClient())
+      : new LocalFileManager();
+  };
+
+  return {
+    /**
+     * Runs when this Sails app loads/lifts.
+     */
+
+    async initialize() {
+      sails.log.info('Initializing custom hook (`file-manager`)');
+
+      return new Promise((resolve) => {
+        sails.after('hook:s3:loaded', () => {
+          createInstance();
+          resolve();
+        });
+      });
+    },
+
+    getInstance() {
+      return instance;
+    },
+  };
+};