Essential backend functionality, including logins.

api/controllers/bookController.js

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+'use strict';
+
+const mongoose = require('mongoose'),
+  Book = mongoose.model('Book');
+
+exports.list_all = function(req, res) {
+  Book.find({}, function(error, books) {
+    if (error) res.status(400).send(error);
+    else res.json(books);
+  });
+};
+
+exports.create = function(req, res) {
+  // TODO authenticate
+  const book = new Book(req.body);
+  book.save(function(error, book) {
+    if (error) res.status(400).send(error);
+    else res.json(book);
+  });
+};
+
+exports.get = function(req, res) {
+  Book.findById(req.params.bookId, function(error, book) {
+    if (error) res.status(400).send(error);
+    else res.json(book);
+  });
+};
+
+exports.update = function(req, res) {
+  Book.findOneAndUpdate({
+    _id: req.params.bookId
+  }, req.body, {
+    new: true
+  }, function(error, book) {
+    if (error) res.status(400).send(error);
+    else res.json(book);
+  });
+};
+
+exports.delete = function(req, res) {
+  Book.remove({
+    _id: req.params.bookId
+  }, function(error, book) {
+    if (error) res.status(400).send(error);
+    else res.json({
+      message: 'Book ' + book.title + ' deleted'
+    });
+  });
+};