Replacing Payload Auth

export const POST = async (request: Request) => {
  const req = await createPayloadRequest({
    config: configPromise,
    request,
  })

  await addDataAndFileToRequest(req)

  const { email, password } = req.data as { email: string; password: string }

  const payload = await getPayload({
    config: configPromise,
  })

  const customAuthResponse = await fetch('<custom auth endpoint>', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      Accept: 'application/json',
    },
    body: JSON.stringify({
      query: `mutation LoginMutation($password: String!, $username: String!) {
        tokenAuth(password: $password, username: $username) {
          user {
            id
          }
        }
      }`,
      variables: { username: email, password },
    }),
  })

  const response = await customAuthResponse.json()

  const isSuccessful = !!response.data?.tokenAuth

  if (isSuccessful) {
    const collectionConfig = payload.collections['users'].config
    const _user = await findOrCreateUser(email)

    const fieldsToSign: User = {
      email: _user.email,
      id: _user.id,
      collection: 'users',
    }

    const issueAt = Math.floor(Date.now() / 1000)
    const exp = issueAt + collectionConfig.auth.tokenExpiration
    const jwtToken = await new SignJWT(fieldsToSign)
      .setProtectedHeader({ alg: 'HS256', typ: 'JWT' })
      .setIssuedAt(issueAt)
      .setExpirationTime(exp)
      .sign(new TextEncoder().encode(process.env.PAYLOAD_SECRET || 'default_secret'))

    const cookie = generatePayloadCookie({
      collectionAuthConfig: collectionConfig.auth,
      cookiePrefix: payload.config.cookiePrefix,
      token: jwtToken,
    })

    return Response.json(
      { status: 'SUCCESS', user: fieldsToSign, exp, token: jwtToken },
      { headers: new Headers({ 'Set-Cookie': cookie }), status: 200 },
    )
  }

  return Response.json(
    { status: 'FAILED', errors: [{ message: 'The email or password provided is incorrect.' }] },
    { status: 401 },
  )
}