Lottery, get/delete attendees.

Changed so get attendees no longer is done in two endpoints, now we use
req.isAuthenticated() to check if we want to return full or minimal json
data about each attendee.

api/lottery.js

@@ -0,0 +1,35 @@
+const path = require("path");
+const Attendee = require(path.join(__dirname, "/schemas/Attendee"));
+
+const redactAttendeeInfoMapper = attendee => {
+  return {
+    name: attendee.name,
+    raffles: attendee.red + attendee.blue + attendee.yellow + attendee.green,
+    red: attendee.red,
+    blue: attendee.blue,
+    green: attendee.green,
+    yellow: attendee.yellow
+  };
+};
+
+const allAttendees = isAdmin => {
+  if (!isAdmin) {
+    return Attendee.find().then(attendees => attendees.map(redactAttendeeInfoMapper));
+  } else {
+    return Attendee.find();
+  }
+};
+
+const deleteAttendees = () => {
+  const io = req.app.get("socketio");
+
+  return Attendee.deleteMany().then(_ => {
+    io.emit("refresh_data", {});
+    return true;
+  });
+};
+
+module.exports = {
+  allAttendees,
+  deleteAttendees
+};