nextjs-basic-auth-middleware

nextjs-basic-auth-middleware

:warning: Current path support in the middleware shouldn't be used, use matcher to handle paths

Adds basic auth support to Next.js projects using the official middleware approach (with a _middleware file). An alternative approach for server side rendered (SSR) pages is also available. Options can be set on the basic auth middleware and overridden using environment variables.

Installation

Run either of the following commands to add the package, based on your package manager of choice:

# NPM
npm install nextjs-basic-auth-middleware

# Yarn
yarn add nextjs-basic-auth-middleware

Usage

Next.js Middleware

The Next.js middleware functionality allows you to add basic auth in front of all your requests, see the Next.js Middleware documentation for more information.

You can use the createNextAuthMiddleware function to create a default middleware function that sends a NextResponse.next() when the auth passes:

    import { createNextAuthMiddleware } from 'nextjs-basic-auth-middleware'

    export const middleware = createNextAuthMiddleware(options)

You can also use the nextBasicAuthMiddleware function to check basic auth in a bigger middleware function:

    import { nextBasicAuthMiddleware } from 'nextjs-basic-auth-middleware'

    export const middleware = (req) => {
        nextBasicAuthMiddleware(options, req)

        // Your other middleware functions

        return NextResponse.next()
    }

:warning: The middleware will still return a 401 and will quit processing the rest of the middleware. Add this middleware after any required work.

Original approach

This approach only works for server side rendered pages where a request and response object are available.

Either add it to individual pages in the getServerSideProps method:

    import { pageMiddleware } from 'nextjs-basic-auth-middleware'

    export async function getServerSideProps({ req, res }) => {
        pageMiddleware(req, res)
        ...
    }

Or add the middleware to the getInitialProps method of your document:

    import { pageMiddleware } from 'nextjs-basic-auth-middleware'

    Document.getInitialProps = async ({ req, res }) => {
        pageMiddleware(req, res)
        ...
    }

:warning: This will not work if you have pages that use static optimization, e.g. no use of getInitialProps or getServerSideProps

But this will work anywhere where there is a request and response object available (app/api routes as well).

What about static pages (SSG, ISR)?

Use the Next.js middleware approach if possible.

Some alternatives if this approach will not work for you:

• For Vercel deployments you can check vercel-basic-auth.
• For sites behind AWS CloudFront you can add a Lambda@edge function that adds authentication headers
• For Cloudflare you could use a Cloudflare worker that adds authentication headers

Setting environment variables

If you want to override credentials you can use the BASIC_AUTH_CREDENTIALS environment variable:

# Enables basic auth for user `test` with password `password`
BASIC_AUTH_CREDENTIALS=user:password

# You can set multiple accounts using `|` as a delimiter
BASIC_AUTH_CREDENTIALS=user:password|user2:password2

Users set using environment variables will override and thus disable users set in options. You can also set the paths that should (not) be checked:

# Enables basic authentication for /pages
BASIC_AUTH_PATHS=/pages

# You can set multiple paths using `;` as a delimiter
BASIC_AUTH_PATHS=/pages;/admin

# Setting excluded paths work in the same way
BASIC_AUTH_EXCLUDE_PATHS=/api;/healthchecks

API

basicAuthMiddleware()

basicAuthMiddleware(req: http.IncomingMessage, res: http.ServerResponse, options)

The options object can contain any of the following options:

option	description	default value
realm	The name of the basic auth realm	'Protected'
users	A list of users that can authenticate	[]
includePaths	List of paths that should have protection	['/']
excludePaths	List of paths that are excluded from protection	[]

NOTE The exclude paths are always excluded from protection, even if they exist in the included paths

The user object consists of the following required fields:

field	description	type
name	The username	string
password	The password	string

Local Development

Below is a list of commands you will probably find useful.

npm start or yarn start

Runs the project in development/watch mode. Your project will be rebuilt upon changes. TSDX has a special logger for your convenience. Error messages are pretty printed and formatted for compatibility VS Code's Problems tab.

Your library will be rebuilt if you make edits.

npm run build or yarn build

Bundles the package to the dist folder. The package is optimized and bundled with Rollup into multiple formats (CommonJS, UMD, and ES Module).

npm test or yarn test

Runs the test watcher (Jest) in an interactive mode. By default, runs tests related to files changed since the last commit.

This project was bootstrapped with TSDX.

Changelog

1.0.0

• Adds first version of the Next.js middleware