Struggling with integrating sign-up API that includes role-based logic for buyers and sellers in Next.js

Question

Struggling with integrating sign-up API that includes role-based logic for buyers and sellers in Next.js

I am currently developing a project with Next.js 14 and TypeScript that involves managing two distinct roles: Buyers and Sellers. As users sign up, they are required to select their role, which then determines the dashboard they should be redirected to (either Buyer's or Seller's). However, I am encountering challenges when it comes to implementing the sign-up API responsible for handling this role-based logic.

Let me provide you with an outline of the current setup:

The Sign-Up Process:

Users complete a sign-up form with their email, full name, and password details.

After submitting the form, users must indicate whether they are a Buyer or a Seller.

Based on their role selection, users should be directed to the appropriate dashboard (/dashboard/buyer or /dashboard/seller).
Issues Faced:

The API is struggling to properly manage the role-based redirection post-form submission.

At times, the user's role is not saved correctly, leading to unexpected issues with redirection.

In my implementation, I am utilizing server actions for form submission and authentication within Next.js instead of conventional API routes.

Below is a simplified snippet showcasing the code I am working with:

async function handleSignUp(data: FormData) {
  "use server";
  const role = data.get('role'); // buyer or seller
  const email = data.get('email');
  const password = data.get('password');
  try {
    // sign-up logic here
    if (role === 'buyer') {
      return { redirect: '/dashboard/buyer' };
    } else if (role === 'seller') {
      return { redirect: '/dashboard/seller' };
    }
  } catch (error) {
    console.error('Sign-up error:', error);
  }
}

Actions Taken So Far:

Thoroughly debugging the form data to ensure accurate passage of the role value.
Reviewing the redirection flow following form submission.
Utilizing server actions as a substitute for traditional API routes.

Queries:

What steps can I take to effectively implement the sign-up API for managing role-based redirection in Next.js 13?
Do you have any recommended strategies for handling role-based authentication and redirection using server actions in Next.js?

Your guidance and examples would be highly valuable!

javascript next.js next-auth rbac

Answer 1

Answer №1

When storing user details, including their role, in a table during sign-up and utilizing next-auth for authentication, you can automatically trigger the sign-in function of next-auth right after successful sign-up. Below is an example implementation using CredentialsProvider.

The middleware example provided also manages the authorization logic, which can be customized based on specific requirements.

It is recommended to handle role-based authentications from the server-side or middleware for better security.

//Code snippet from next-auth route.ts file with CredentialsProvider

CredentialsProvider({
      //@ts-expect-error
      async authorize(credentials, _req) {
         //@ts-expect-error
        const user: User = await getUser(credentials.email); // implement function to retrieve user details including password and role from database
        // perform checks such as user existence and validation
        // validate user password
        const isValid = await verifyPassword(
          //@ts-expect-error
          credentials.password,
          user.password
        );
        if (!isValid) {
          throw Error("Incorrect Password");
        }
        //instead of image, returning user role here
        return {
          image: user.role,
          email: user.email,
          name: user.name,
        };
      },
    }),

//Middleware example in middleware.tsx (create this file in project root directory)

import { NextFetchEvent, NextRequest, NextResponse } from "next/server";
import { getToken } from "next-auth/jwt";
import { withAuth } from "next-auth/middleware";
export default async function middleware(
  req: NextRequest,
  event: NextFetchEvent
) {
  const PUBLIC_FILE = /\.(.*)$/;
  const pathname = req.nextUrl.pathname;
  const token = await getToken({ req });
  const isAuthenticated = !!token;
  
  if(isAuthenticated && pathname=="/dashboard"){
      if(token.picture=="buyer"){
          return NextResponse.redirect(new URL("/dashboard/buyer", req.url));
      }else if(token.picture=="seller"){
          return NextResponse.redirect(new URL("/dashboard/seller", req.url));
      }
  }

  if (
    pathname.startsWith("/_next") ||
    pathname.includes("/api") ||
    pathname.includes("/signup") || 
    PUBLIC_FILE.test(pathname) ||
    isAuthenticated
  ) {
    return NextResponse.next();
  }

  const authMiddleware = withAuth({
    pages: {
      signIn: "/login",
    },
  });
  
  return authMiddleware(req, event);
}

//Function for signing in

import { signIn } from "next-auth/react";

//after successful signup
const result = await signIn("credentials", {
      redirect: false,
      email: "email",
      password:"password",
    });

    setLoading(false);

    if (result && !result.error) {
       //success scenario - dummy route; middleware will handle redirection based on role
      router.replace("/dashboard");
    } else if (result?.error) {
      //failed scenario
    }

Answer 2

When storing user details, including their role, in a table during sign-up and utilizing next-auth for authentication, you can automatically trigger the sign-in function of next-auth right after successful sign-up. Below is an example implementation using CredentialsProvider.

The middleware example provided also manages the authorization logic, which can be customized based on specific requirements.

It is recommended to handle role-based authentications from the server-side or middleware for better security.

//Code snippet from next-auth route.ts file with CredentialsProvider

CredentialsProvider({
      //@ts-expect-error
      async authorize(credentials, _req) {
         //@ts-expect-error
        const user: User = await getUser(credentials.email); // implement function to retrieve user details including password and role from database
        // perform checks such as user existence and validation
        // validate user password
        const isValid = await verifyPassword(
          //@ts-expect-error
          credentials.password,
          user.password
        );
        if (!isValid) {
          throw Error("Incorrect Password");
        }
        //instead of image, returning user role here
        return {
          image: user.role,
          email: user.email,
          name: user.name,
        };
      },
    }),

//Middleware example in middleware.tsx (create this file in project root directory)

import { NextFetchEvent, NextRequest, NextResponse } from "next/server";
import { getToken } from "next-auth/jwt";
import { withAuth } from "next-auth/middleware";
export default async function middleware(
  req: NextRequest,
  event: NextFetchEvent
) {
  const PUBLIC_FILE = /\.(.*)$/;
  const pathname = req.nextUrl.pathname;
  const token = await getToken({ req });
  const isAuthenticated = !!token;
  
  if(isAuthenticated && pathname=="/dashboard"){
      if(token.picture=="buyer"){
          return NextResponse.redirect(new URL("/dashboard/buyer", req.url));
      }else if(token.picture=="seller"){
          return NextResponse.redirect(new URL("/dashboard/seller", req.url));
      }
  }

  if (
    pathname.startsWith("/_next") ||
    pathname.includes("/api") ||
    pathname.includes("/signup") || 
    PUBLIC_FILE.test(pathname) ||
    isAuthenticated
  ) {
    return NextResponse.next();
  }

  const authMiddleware = withAuth({
    pages: {
      signIn: "/login",
    },
  });
  
  return authMiddleware(req, event);
}

//Function for signing in

import { signIn } from "next-auth/react";

//after successful signup
const result = await signIn("credentials", {
      redirect: false,
      email: "email",
      password:"password",
    });

    setLoading(false);

    if (result && !result.error) {
       //success scenario - dummy route; middleware will handle redirection based on role
      router.replace("/dashboard");
    } else if (result?.error) {
      //failed scenario
    }

Struggling with integrating sign-up API that includes role-based logic for buyers and sellers in Next.js

Answer №1

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