ReactJS - NextJS - A HOC for wrapping NextJS pages in an authentication check. Checks for getInitialProps on the child component and runs it, so you still get SSR from the page. Also includes a user agent for Material UI.

nextjs-hoc-authorization.js

import React, {Component} from 'react'
import Router from 'next/router'
import AuthService from './AuthService'

export default function withAuth(AuthComponent) {
    const Auth = new AuthService('http://localhost')
    return class Authenticated extends Component {

      static async getInitialProps(ctx) {
        // Ensures material-ui renders the correct css prefixes server-side
        let userAgent
        if (process.browser) {
          userAgent = navigator.userAgent
        } else {
          userAgent = ctx.req.headers['user-agent']
        }

        // Check if Page has a `getInitialProps`; if so, call it.
        const pageProps = AuthComponent.getInitialProps && await AuthComponent.getInitialProps(ctx);
        // Return props.
        return { ...pageProps, userAgent }
      }

      constructor(props) {
        super(props)
        this.state = {
          isLoading: true
        };
      }

      componentDidMount () {
        if (!Auth.loggedIn()) {
          Router.push('/')
        }
        this.setState({ isLoading: false })
      }

      render() {
        return (
          <div>
          {this.state.isLoading ? (
              <div>LOADING....</div>
            ) : (
              <AuthComponent {...this.props}  auth={Auth} />
            )}
          </div>
        )
      }
    }
}

Hi, I've just realized, why don't we use this withAuth as a HOC on the component that the page renders, not on the page itself. This way we could use getStaticProps and getServerSideProps as normal.
The withAuth HOC will then only be responsible for authentication check and redirect stuff, no need for getIntitalProps inside since we could declare that on the page.
For example, a page at pages/products.js

import React from 'react'
import ProductList from '@components/ProductList'
import withAuth from '@utils/withAuth'

function ProductsPage(props) {
  const AuthenticatedProductList = withAuth(ProductList);
  return <AuthenticatedProductList {...props} />
}

export async function getStaticProps(context) {
 // getStaticProps stuff
}

export async function getServerSideProps(context) {
 // getServerSideProps stuff
}

ProductsPage.getInitialProps = async (ctx) => {
  // getInitialProps stuff
}

export default ProductsPage;

can you provide a full implementation please?

I couldn't use the getServerSideProps method in a HOC, because it is only available on pages. Neither use getInitialProps inside a getServerSideProps, I got a warning in my console.

In my case. I needed a generic function to validate the user's access to a private page with an async call. I solved this by creating a function that receives the context and a callback.

//util.js
const validateRoute = (context) => async (callback) => {
  const { id, pathname } = context.query;
  const paths = await getAllowedPaths(id);
  if (!paths.includes(pathname)) {
    return {
      redirect: "/home",
      permanente: false,
    };
  }
  return callback();
};

In all my private pages.

export const getServerSideProps = (context) => {
  return validateRoute(context)(async () => {
    // my custom callback for each page.
    const { id } = context.query;
    const props = await getUserData(id);
    return {
      props,
    };
  });
};

I couldn't use the getServerSideProps method in a HOC, because it is only available on pages. Neither use getInitialProps inside a getServerSideProps, I got a warning in my console.

In my case. I needed a generic function to validate the user's access to a private page with an async call. I solved this by creating a function that receives the context and a callback.

//util.js
const validateRoute = (context) => async (callback) => {
  const { id, pathname } = context.query;
  const paths = await getAllowedPaths(id);
  if (!paths.includes(pathname)) {
    return {
      redirect: "/home",
      permanente: false,
    };
  }
  return callback();
};

In all my private pages.

export const getServerSideProps = (context) => {
  return validateRoute(context)(async () => {
    // my custom callback for each page.
    const { id } = context.query;
    const props = await getUserData(id);
    return {
      props,
    };
  });
};

would you help port this to typescript?

I was able to cast it like this:

import { GetServerSidePropsContext, GetServerSidePropsResult } from 'next'
import Cookies from 'cookies'

type EmptyProps = {
  props: Record<string, unknown>
}

// HOC to only be executed when user is not logged in, otherwise redirect to portal
const withoutAuth = (context: GetServerSidePropsContext) => async (
  callback: () => any
): Promise<GetServerSidePropsResult<EmptyProps>> => {
  const cookies = new Cookies(context.req, context.res)

  if (cookies.get('user')) {
    return {
      redirect: {
        destination: '/protected-source',
        permanent: false,
      },
    }
  }

  return callback()
}

export default withoutAuth

I still can't figure the typescript definition for the callback... I've ended up doing callback: () => any

I couldn't use the getServerSideProps method in a HOC, because it is only available on pages. Neither use getInitialProps inside a getServerSideProps, I got a warning in my console.
In my case. I needed a generic function to validate the user's access to a private page with an async call. I solved this by creating a function that receives the context and a callback.

//util.js
const validateRoute = (context) => async (callback) => {
  const { id, pathname } = context.query;
  const paths = await getAllowedPaths(id);
  if (!paths.includes(pathname)) {
    return {
      redirect: "/home",
      permanente: false,
    };
  }
  return callback();
};

In all my private pages.

export const getServerSideProps = (context) => {
  return validateRoute(context)(async () => {
    // my custom callback for each page.
    const { id } = context.query;
    const props = await getUserData(id);
    return {
      props,
    };
  });
};

would you help port this to typescript?

I was able to cast it like this:

import { GetServerSidePropsContext, GetServerSidePropsResult } from 'next'
import Cookies from 'cookies'

type EmptyProps = {
  props: Record<string, unknown>
}

// HOC to only be executed when user is not logged in, otherwise redirect to portal
const withoutAuth = (context: GetServerSidePropsContext) => async (
  callback: () => any
): Promise<GetServerSidePropsResult<EmptyProps>> => {
  const cookies = new Cookies(context.req, context.res)

  if (cookies.get('user')) {
    return {
      redirect: {
        destination: '/protected-source',
        permanent: false,
      },
    }
  }

  return callback()
}

export default withoutAuth

I still can figure the typescript definition for the callback... I've ended up doing callback: () => any

@mtoranzoskw callback has no parameter and might return the same values of withoutAuth. Try this out, let me know if it works.

const withoutAuth = (context: GetServerSidePropsContext) => async (
  callback: () => GetServerSidePropsResult<EmptyProps>
): Promise<GetServerSidePropsResult<EmptyProps>> => {

I couldn't use the getServerSideProps method in a HOC, because it is only available on pages. Neither use getInitialProps inside a getServerSideProps, I got a warning in my console.
In my case. I needed a generic function to validate the user's access to a private page with an async call. I solved this by creating a function that receives the context and a callback.

//util.js
const validateRoute = (context) => async (callback) => {
  const { id, pathname } = context.query;
  const paths = await getAllowedPaths(id);
  if (!paths.includes(pathname)) {
    return {
      redirect: "/home",
      permanente: false,
    };
  }
  return callback();
};

In all my private pages.

export const getServerSideProps = (context) => {
  return validateRoute(context)(async () => {
    // my custom callback for each page.
    const { id } = context.query;
    const props = await getUserData(id);
    return {
      props,
    };
  });
};

would you help port this to typescript?
I was able to cast it like this:

import { GetServerSidePropsContext, GetServerSidePropsResult } from 'next'
import Cookies from 'cookies'

type EmptyProps = {
  props: Record<string, unknown>
}

// HOC to only be executed when user is not logged in, otherwise redirect to portal
const withoutAuth = (context: GetServerSidePropsContext) => async (
  callback: () => any
): Promise<GetServerSidePropsResult<EmptyProps>> => {
  const cookies = new Cookies(context.req, context.res)

  if (cookies.get('user')) {
    return {
      redirect: {
        destination: '/protected-source',
        permanent: false,
      },
    }
  }

  return callback()
}

export default withoutAuth

I still can figure the typescript definition for the callback... I've ended up doing callback: () => any

@mtoranzoskw callback has no parameter and might return the same values of withoutAuth. Try this out, let me know if it works.

const withoutAuth = (context: GetServerSidePropsContext) => async (
  callback: () => GetServerSidePropsResult<EmptyProps>
): Promise<GetServerSidePropsResult<EmptyProps>> => {

Not working... I've tried that but I have an error when implementing it

Got an error using Promise as well (callback: () => Promise<GetServerSidePropsResult<EmptyProps>>)

I couldn't use the getServerSideProps method in a HOC, because it is only available on pages. Neither use getInitialProps inside a getServerSideProps, I got a warning in my console.
In my case. I needed a generic function to validate the user's access to a private page with an async call. I solved this by creating a function that receives the context and a callback.

//util.js
const validateRoute = (context) => async (callback) => {
  const { id, pathname } = context.query;
  const paths = await getAllowedPaths(id);
  if (!paths.includes(pathname)) {
    return {
      redirect: "/home",
      permanente: false,
    };
  }
  return callback();
};

In all my private pages.

export const getServerSideProps = (context) => {
  return validateRoute(context)(async () => {
    // my custom callback for each page.
    const { id } = context.query;
    const props = await getUserData(id);
    return {
      props,
    };
  });
};

would you help port this to typescript?
I was able to cast it like this:

import { GetServerSidePropsContext, GetServerSidePropsResult } from 'next'
import Cookies from 'cookies'

type EmptyProps = {
  props: Record<string, unknown>
}

// HOC to only be executed when user is not logged in, otherwise redirect to portal
const withoutAuth = (context: GetServerSidePropsContext) => async (
  callback: () => any
): Promise<GetServerSidePropsResult<EmptyProps>> => {
  const cookies = new Cookies(context.req, context.res)

  if (cookies.get('user')) {
    return {
      redirect: {
        destination: '/protected-source',
        permanent: false,
      },
    }
  }

  return callback()
}

export default withoutAuth

I still can figure the typescript definition for the callback... I've ended up doing callback: () => any

@mtoranzoskw callback has no parameter and might return the same values of withoutAuth. Try this out, let me know if it works.

const withoutAuth = (context: GetServerSidePropsContext) => async (
  callback: () => GetServerSidePropsResult<EmptyProps>
): Promise<GetServerSidePropsResult<EmptyProps>> => {

Not working... I've tried that but I have an error when implementing it

Got an error using Promise as well (callback: () => Promise<GetServerSidePropsResult<EmptyProps>>)

@mtoranzoskw try to make your props optional.

type EmptyProps = {
  props?: Record<string, unknown>
}

// or

type EmptyProps = {
  props: Partial<Record<string, unknown>>
}

Thanks for the help @Sergioamjr

I've tried both, but making props optional was the only one that worked! I guess Partial would go 1 level up so that props become optional.

type EmptyProps = {
  props?: Record<string, unknown>
}

💪

anyone done this without getInialProps ? currently im using next 11 and i want to add auth to my app but so far i couldnt understand the logic around protected routes in next js

Thank a lot