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fix(auth): preserve basePath in request URL reconstruction (#13034) #13174

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fix(auth): preserve basePath in request URL reconstruction (#13034) #13174

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12 changes: 10 additions & 2 deletions packages/next-auth/src/lib/env.ts
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Expand Up @@ -3,13 +3,21 @@ import { NextRequest } from "next/server"
import type { NextAuthConfig } from "./index.js"
import { setEnvDefaults as coreSetEnvDefaults } from "@auth/core"

/** If `NEXTAUTH_URL` or `AUTH_URL` is defined, override the request's URL. */
/**
* If `NEXTAUTH_URL` or `AUTH_URL` is defined, override the request's URL.
* Reset the basePath onto the url as it checks the full url in nextauth api handlers
* References:
* - Bug in Next.js affecting URL handling: https://github.com/vercel/next.js/issues/62756
* - Bug in NextAuth causing incorrect action, redirect URL behavior: https://github.com/nextauthjs/next-auth/issues/13034
*/
export function reqWithEnvURL(req: NextRequest): NextRequest {
const url = process.env.AUTH_URL ?? process.env.NEXTAUTH_URL
// nextjs basepath not auth config basepath
const basePath = process.env.NEXT_PUBLIC_BASE_PATH || ''
if (!url) return req
const { origin: envOrigin } = new URL(url)
const { href, origin } = req.nextUrl
return new NextRequest(href.replace(origin, envOrigin), req)
return new NextRequest(href.replace(origin, envOrigin + basePath), req)
}

/**
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