Added user sign up and login.

src/users.js

@@ -0,0 +1,40 @@
+'use strict';
+
+const knex = require('./knex');
+
+function curateUser(user) {
+	if (!user) {
+		return null;
+	}
+
+	const ability = [...(user.role_abilities || []), ...(user.abilities || [])];
+
+	const curatedUser = {
+		id: user.id,
+		username: user.username,
+		email: user.email,
+		emailVerified: user.email_verified,
+		identityVerified: user.identity_verified,
+		ability,
+		createdAt: user.created_at,
+	};
+
+	return curatedUser;
+}
+
+async function fetchUser(userId) {
+	const user = await knex('users')
+		.select('users.*', 'users_roles.abilities as role_abilities')
+		.where('id', userId)
+		.orWhere('username', userId)
+		.orWhere('email', userId)
+		.leftJoin('users_roles', 'users_roles.role', 'users.role')
+		.first();
+
+	return curateUser(user);
+}
+
+module.exports = {
+	curateUser,
+	fetchUser,
+};