How to Deploy Your Secure Vue.js App to AWS

Original Source: https://www.sitepoint.com/deploy-your-secure-vue-js-app-to-aws/

This article was originally published on the Okta developer blog. Thank you for supporting the partners who make SitePoint possible.

Writing a Vue app is intuitive, straightforward, and fast. With low barriers to entry, a component-based approach, and built-in features like hot reloading and webpack, Vue allows you to focus on developing your application rather than worrying about your dev environment and build processes. But, what happens when you are ready to deploy your app into production? The choices can be endless and sometimes unintuitive.

As an AWS Certified Solutions Architect, I am frequently asked how to deploy Vue apps to AWS. In this tutorial, I will walk you through building a small, secure Vue app and deploying it to Amazon Web Services (AWS). If you’ve never used AWS, don’t worry! I’ll walk you through each step of the way starting with creating an AWS account.

About AWS

Amazon Web Services (AWS) is a cloud platform that provides numerous on-demand cloud services. These services include cloud computing, file storage, relational databases, a content distribution network, and many, many more. AWS came into existence not as a retail offering, but rather Amazon’s internal answer to the growing complexity of the infrastructure that was responsible for powering Amazon.com and their e-commerce operations. Amazon quickly realized their cloud-based infrastructure was a compelling, cost-effective solution and opened it to the public in 2006.

At the time of writing this article, AWS is worth an estimated $250B (yes, that’s a B for BILLION) and used by thousands of companies and developers worldwide.

What You Will Build

I feel the best way to learn is by doing. I’ll walk you through building a small, Vue app with an Express REST server. You will secure your app using Okta’s OpenID Connect (OIDC) which enables user authentication and authorization with just a few lines of code.

You will begin by building the Vue frontend and deploy it to Amazon S3. Then you will leverage Amazon CloudFront to distribute your Vue frontend to edge servers all around the world. Lastly, you will create an Express API server and deploy it with Serverless. This API server will contain a method to fetch “secure data” (just some dummy data) which requires a valid access token from the client to retrieve.

The goal of this article is to show you how to leverage multiple AWS services rather than just spinning up a single EC2 instance to serve your app. With this services-based approach, you have a limitless scale, zero maintenance, and a cost-effective way to deploy apps in the cloud.

What is Okta?

Okta is a cloud service that allows developers to manage user authentication and connect them with one or multiple applications. The Okta API enables you to:

Authenticate and authorize your users
Store data about your users
Perform password-based and social login
Secure your application with multi-factor authentication
And much more! Check out our product documentation

Register for a free developer account, and when you’re done, come on back so we can learn more deploying a Vue app to AWS.

Bootstrap Frontend

You are going to build the Vue frontend to your secure app first and deploy it to Amazon S3 and Amazon CloudFront. Amazon S3 (Simple Storage Service) is a highly redundant, object-based file store that is both powerful and featureful. In the scope of this article, we will focus on one of the best features S3 provides: Static website hosting.

To get started quickly, you can use the scaffolding functionality from vue-cli to get your app up and running quickly. For this article, you can use the webpack template that includes hot reloading, CSS extraction, linting, and integrated build tools.

To install vue-cli run:

npm install -g vue-cli@2.9.6

Next up is to initialize your project. When you run the following vue init command, accept all the default values.

vue init webpack secure-app-client
cd ./secure-app-client
npm run dev

The init method should also install your app’s dependencies. If for some reason it doesn’t, you can install them via npm install. Finally, open your favorite browser and navigate to http://localhost:8080. You should see the frontend come alive!

About Single Page Applications

When you create an application with Vue, you are developing a Single Page Application (or “SPA”). SPAs have numerous advantages over traditional multi-page, server-rendered apps. It’s important to understand the difference between SPAs and multi-page web applications — especially when it comes to deploying.

A SPA app is often referred as a “static app” or “static website.” Static, in this context, means that your application compiles all its code to static assets (HTML, JS, and CSS). With these static assets, there is no specialized web server required to serve the application to your users.

Traditional web applications require a specialized web server to render every request to a client. For each of these requests, the entire payload of a page (including static assets) is transferred.

Conversely, within an SPA there is only an initial request for the static files, and then JavaScript dynamically rewrites the current page. As your users are navigating your app, requests to subsequent pages are resolved locally and don’t require an HTTP call to a server.

Vue-router and Creating Additional Routes

The component of an SPA that is required to rewrite the current page dynamically is commonly referred to as a “router”. The router programmatically calculates which parts of the page should mutate based off the path in the URL.

Vue has an official router that is aptly named vue-router. Since you used the vue-cli bootstrap, your app has this dependency and a router file defined (./src/router/index.js). Before we can define additional routes, we need to create the pages (or components) that you want the router to render. Create the following files in your project:

Homepage: ./src/components/home.vue

<template>
<div>
<h1>Home</h1>
<div>
<router-link to=”/secure”>Go to secure page</router-link>
</div>
</div>
</template>

Secure Page (not secured… yet!) ./src/components/secure.vue

<template>
<div>
<h1>Secure Page</h1>
<div>
<router-link to=”/”>Go back</router-link>
</div>
</div>
</template>

Using vue-router, you can inform the application to render each page based on the path.

Modify ./src/router/index.js to match the following code snippet:

import Vue from ‘vue’
import Router from ‘vue-router’
import Home from ‘@/components/home’
import Secure from ‘@/components/secure’

Vue.use(Router)

let router = new Router({
routes: [
{
path: ‘/’,
name: ‘Home’,
component: Home
},
{
path: ‘/secure’,
name: ‘Secure’,
component: Secure
}
]
})

export default router

Try it out! Tab back to your browser, and you should see the new home screen. If you click on the “Go to secure page” link you will notice the page (and URL) change, but no request was sent to a server!

Understand Hash History

As you navigated between the two pages above, you might have seen that the URL looks different than expected (do you noticed the “#/” at the beginning of the path?)

http://localhost:8080/#/ and http://localhost:8080/#/secure

The reason the URL looks like is because vue-router’s default mode is hash mode. Hash mode simulates a new URL change without instructing the browser to reload the page. This behavior is what allows SPA’s to navigate pages without forcing your browser to make any additional HTTP requests. Vue-router listens for changes in the hash portion of the URL (everything after the “#”) and responds accordingly based on the routes configured.

You can change the mode of vue-router to leverage history mode which will give your app “pretty URLs” like:

http://localhost:8080/secure

But, this comes with a significant drawback — especially when you are deploying. Since your SPA compiles to a static assets, there is just one single entry point index.html. If you try to access a page direction that is not index.html page (i.e.; http://localhost:8080/secure) the web server will return a 404 error. Why? The browser is sending a GET /secure request to the server and trying to resolve to the filesystem “/secure” (and the file doesn’t exist). It does work when you navigate to /secure from the homepage because vue-router prevents the default behavior of the browsers and instructs the router instance to fire in any mode.

By using history mode, you have to take additional steps to make sure page refreshes work correctly. You can read more about HTML5 History Mode. To keep things easy, I will show you a simple trick to ensure your refreshing works with AWS CloudFront.

Enable history mode by modifying ./router/index.js with the following setting.

let router = new Router({
mode: ‘history’,
})

Note: The dev server (npm run dev) automatically rewrites the URL to index.html for you. So the behavior you see locally is how it should work in production.

Building Your Single Page Application

Now that you have a simple, two-page frontend working locally, it’s time to build your app and get it deployed to AWS!

Because you used vue-cli scaffolding, a single call to the included build script is all you need. From your project root, run npm run build and webpack will build your application into the target ./dist directory. If the dev server is still running in your console, you can press CTRL+C.

If you open the ./dist folder and you should see the results of the build process:

./index.html – This is the entry point of your SPA. It’s a minified HTML document with links to the apps CSS and JS.
./static – This folder contains all your compiled static assets (JS and CSS)

During the build, you might have noticed the following notification: Tip: built files are meant to be served over an HTTP server. Opening index.html over file:// won’t work. If you want to test your newly compiled application locally, you can use serve (install via npm install -g serve). Run serve ./dist and it will output a URL for you to load into your browser.

This also gives you to have a hands-on experience with the major caveat of history mode with vue-router. After running serve ./dist, click on the “Go to secure page”. You should see a 404 error.

Getting Started with AWS

You will need an AWS account to continue beyond this point. If you already have an AWS account, you can skip ahead. If you don’t, it’s a simple process that only takes a few minutes.

Navigate to the Amazon Web Services home page
Click Sign Up (or if you have signed into AWS recently choose Sign In to the Console)
If prompted, you can select “Personal” for account type
Complete the required information, add a payment method, and verify your phone number
After your account is created, you should receive a confirmation email
Log in!

Note: Amazon requires you to enter a payment method before you can create your account. All the services discussed in this article are covered under AWS Free Tier which gives you 12 months FREE.

Host Your App on Amazon S3

Since your SPA is comprised of only static assets, we can leverage Amazon S3 (Simple Storage Service) to store and serve your files.

To get started, you will need to create a bucket. Buckets are a logical unit of storage within S3, and you can have up to 100 buckets per AWS account by default (if you are studying for the AWS Certified Solutions Architect exam, you should know this!). Each bucket can have its own configuration and contain unlimited files and nested folders.

After you log in to your AWS Console, navigate to the S3 console (you can do this under AWS services search for “S3”).

Click “Create Bucket” and enter a Bucket name. Important: Bucket names are unique across the entire AWS platform. I chose bparise-secure-app-client for this article, but you might need to be creative with your naming!
Click “Create” in the bottom left.

You should now see your bucket listed. Next, let’s configure it for static website hosting.

Click your Bucket name and then choose the “Properties” tab.
Click on “Static website hosting” box
Choose “Use this bucket to host a website” and add “index.html” as the index document. Click “Save”.

At the top of the Static website hosting box, you should see a URL for “Endpoint”. This is the publicly accessible URL to view your static website. Open the link into a new browser window, and you should see this:

Access Denied and S3 Bucket Policies

Yes, you should see a 403 Forbidden error! By default, S3 bucket permissions are deny all. To access your bucket’s contents, you must explicitly define who can access your bucket. These bucket permissions are called a Bucket Policy.

To add a Bucket Policy, click on the “Permissions” tab and click “Bucket Policy” button at the top. The following policy allows anyone to read any file in your bucket. Make sure to replace “YOUR-BUCKET-NAME” with your actual bucket name.

{
“Version”: “2012-10-17”,
“Statement”: [
{
“Sid”: “PublicReadAccess”,
“Effect”: “Allow”,
“Principal”: “*”,
“Action”: “s3:GetObject”,
“Resource”: “arn:aws:s3:::YOUR-BUCKET-NAME/*”
}
]
}

Bucket Policies can be quite complex and powerful. But, the main parts of the policy that you should be aware of are:

“Effect”: “Allow”
“Principal”: “*” – Who the policy covers (“*” implies everyone)
“Action”: “s3:GetObject” – The action allowed (s3:GetObject allows read-only access to all objects in your bucket)
“Resource”: “arn:aws:s3:::YOUR-BUCKET-NAME/*” – Which bucket and objects the policy is about.

Click “Save” on the Bucket Policy editor. You should notice a new error is displayed if you set up the policy correctly:

This warning is good advice and a rule of thumb for all S3 buckets. But, since our bucket is exclusively used to host a static website, we don’t have to worry about anyone accessing a file within the bucket they shouldn’t.

Tab back to your browser and refresh the endpoint. You should now see a 404 Not Found error. This error is much easier to resolve because you don’t have any files in your bucket yet.

Deploy to AWS with aws-cli

Now that you have a bucket created and permissions correctly set, it’s time to upload your static assets. Although you can do this manually through the interface by using the “Upload” button, I feel using the aws-cli is more efficient.

Installing asw-cli is different based on your OS. Choose one:

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