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Authentication Setup with Supabase Auth

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Overview

The authentication setup in your application is powered by Supabase Auth, which provides user authentication and session management functionalities. This allows users to sign up, sign in, and manage their authentication state seamlessly.

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Implementation Details

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useUser Utility Function

The useUser function is a custom hook used to access user authentication information throughout the application. It provides access to the user’s session, details, and loading state. 
import { createContext, useContext } from 'react';
import { useUser as useSupaUser, useSessionContext } from '@supabase/auth-helpers-react';

export const UserContext = createContext(undefined);

export const MyUserContextProvider = (props) => {
  // Get session and user information from Supabase Auth
  const { session, isLoading: isLoadingUser, supabaseClient: supabase } = useSessionContext();
  const user = useSupaUser();

  // Additional state for user details and loading data
  // ...

  // Use useEffect to fetch user details from the database
  // ...

  const value = {
    accessToken: session?.access_token ?? null,
    user,
    userDetails,
    isLoading: isLoadingUser || isLoadingData,
  };

  return <UserContext.Provider value={value} {...props} />;
};

export const useUser = () => {
  const context = useContext(UserContext);
  if (context === undefined) {
    throw new Error(`useUser must be used within a MyUserContextProvider.`);
  }
  return context;
};

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_app.js Configuration

The _app.js file serves as the entry point for configuring Supabase Auth in your application. It initializes the Supabase client and provides the session context to the entire application. 
"use client";
import "../app/globals.css";
import { useState } from "react";
import { createBrowserSupabaseClient } from "@supabase/auth-helpers-nextjs";
import { SessionContextProvider } from "@supabase/auth-helpers-react";
import { MyUserContextProvider } from "../utils/useUser";

export default function MyApp({ Component, pageProps }) {
  // Initialize Supabase client
  const [supabaseClient] = useState(() => createBrowserSupabaseClient());

  return (
    <SessionContextProvider supabaseClient={supabaseClient}>
      <MyUserContextProvider>
        <Component {...pageProps} />
      </MyUserContextProvider>
    </SessionContextProvider>
  );
}

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Usage

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1. Accessing User Authentication Information:

Use the useUser hook to access user authentication information throughout your application. This hook provides access to the user’s session, details, and loading state. Example 
import { useUser } from '../utils/useUser';

const ProfilePage = () => {
  const { user, isLoading } = useUser();

  if (isLoading) {
    return <div>Loading...</div>;
  }

  return (
    <div>
      {user ? (
        <div>Welcome, {user.email}!</div>
      ) : (
        <div>Please sign in to access your profile.</div>
      )}
    </div>
  );
};

export default ProfilePage;

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2. Authentication Flow:

Implement authentication flows such as sign-up, sign-in, and sign-out using Supabase Auth APIs. Handle authentication events and update the UI accordingly. Example: 
import { signIn, signOut } from '@supabase/auth';

const LoginPage = () => {
  const handleSignIn = async () => {
    try {
      await signIn();
    } catch (error) {
      console.error('Error signing in:', error.message);
    }
  };

  const handleSignOut = async () => {
    try {
      await signOut();
    } catch (error) {
      console.error('Error signing out:', error.message);
    }
  };

  return (
    <div>
      <button onClick={handleSignIn}>Sign In</button>
      <button onClick={handleSignOut}>Sign Out</button>
    </div>
  );
};

export default LoginPage;

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Login Page

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Overview

The Login page allows users to sign in to your application using their preferred authentication providers. This page utilizes the Auth component provided by Supabase Auth to streamline the login process and support multiple authentication providers.

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Implementation

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Auth Component

The Auth component integrates with Supabase Auth and provides a user-friendly interface for authentication. It supports various appearance configurations and allows users to sign in using different authentication providers. Example usage: 
import { Auth } from "@supabase/auth-ui-react";
import { ThemeSupa } from "@supabase/auth-ui-shared";

const LoginPage = ({ supabaseClient, redirectTo }) => {
  return (
    <Auth
      supabaseClient={supabaseClient}
      appearance={{ theme: ThemeSupa }}
      providers={["github", "google"]} // Specify the authentication providers you want to enable
      redirectTo={redirectTo} // Redirect URL after successful login
    />
  );
};

export default LoginPage;