Use AJV, refactor a lot

api/models/users/index.js

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+"use strict";
+/**
+ * Model: Users
+ */
+const utils = require(`../../utils`);
+const db = require(`../db`);
+const schemas = require(`./schemas`);
+const sharedSchemas = require(`../schemas`);
+const validation = require(`../validation`);
+
+/**
+ * Create a new user
+ * @param {string} user.email User email
+ * @param {string} user.password User password
+ */
+const create = async (user = {}) => {
+	validation.validateOrThrow(schemas.create, user);
+
+	const existingUser = await getByEmail(user.email);
+	if (existingUser) {
+		throw utils.customError(
+			`A user with email "${user.email}" is already registered`
+		);
+	}
+
+	user.password = utils.hashPassword(user.password);
+
+	await db.put(`user`, {
+		hk: user.email,
+		password: user.password,
+	});
+};
+
+/**
+ * Get user by email address
+ * @param {string} email Email address of user to retrieve
+ */
+const getByEmail = async (email) => {
+	validation.validateOrThrow(sharedSchemas.email, email);
+
+	let user = await db.getByKey(email);
+
+	user = user.Items && user.Items[0] ? user.Items[0] : null;
+	return user;
+};
+
+/**
+ * Get user by id
+ * @param {string} id
+ */
+const getById = async (id) => {
+	validation.validateOrThrow(sharedSchemas.id, id);
+
+	let user = await db.getById(`user`, id);
+
+	user = user.Items && user.Items[0] ? user.Items[0] : null;
+	return user;
+};
+
+/**
+ * Convert user record to public format
+ * This hides the keys used for the dynamodb's single table design and returns human-readable properties.
+ * @param {*} user
+ */
+const convertToPublicFormat = (user = {}) => {
+	user.email = user.hk || null;
+	user.id = user.sk2 || null;
+	if (user.hk) {
+		delete user.hk;
+	}
+	if (user.sk) {
+		delete user.sk;
+	}
+	if (user.sk2) {
+		delete user.sk2;
+	}
+	if (user.password) {
+		delete user.password;
+	}
+	return user;
+};
+
+module.exports = {
+	create,
+	getByEmail,
+	getById,
+	convertToPublicFormat,
+};

api/models/users/schemas.js

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+const sharedSchemas = require(`../schemas`);
+
+module.exports = {
+	"create": {
+		"$schema": "http://json-schema.org/draft-07/schema#",
+		"title": "Create User",
+		"description": "An object to create a new user",
+		"type": "object",
+		"properties": {
+			"email": sharedSchemas.email,
+			"password": {
+				"type": "string",
+				"minLength": 10,
+				"maxLength": 50
+			}
+		},
+		"required": ["email", "password"]
+	}
+};