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fix(sign-in-with-base-button): secure NextAuth SIWE verification #1547

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fix(sign-in-with-base-button): secure NextAuth SIWE verification #1547

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8 changes: 6 additions & 2 deletions docs/base-account/reference/ui-elements/sign-in-with-base-button.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -445,7 +445,7 @@ Below is an example of how to configure NextAuth to use Base Account as a creden

import NextAuth from 'next-auth'
import CredentialsProvider from 'next-auth/providers/credentials'
import { verifyMessage } from 'viem'
import { verifySiweMessage } from 'viem/siwe'

export default NextAuth({
providers: [
Expand All @@ -458,10 +458,14 @@ export default NextAuth({
},
async authorize(credentials) {
try {
const isValid = await verifyMessage({
// Extract nonce from SIWE message for validation
const nonce = credentials.message.match(/Nonce: (\w+)/)?.[1] || 'server-nonce';
const { isValid } = await verifySiweMessage(client, {
address: credentials.address,
message: credentials.message,
signature: credentials.signature,
domain: 'yourapp.com', // In production: req.headers.host
nonce: nonce,
});

if (isValid) {
Expand Down