Getting user information with webhooks

{
  "projectId": sanity::projectId(), 
  "dataset": sanity::dataset(),
  "documentId": _id,
  "revisionId": _rev,
  "operation": delta::operation(),
  "before": before(),
  "after": after(),
  // user id of the person who made the change
  "author": identity(),
  // time the projection was calculated
  // not necessarily the time the transaction was posted!
  // The exact transaction time for a revision can be found in the history API
  "logTime": now(),
}

// Built on Next.js API routes: https://nextjs.org/docs/api-routes/introduction

// provide your Sanity token from an environment variable
import {sanityToken} from 'lib/config'
import type {NextApiHandler, NextApiRequest, NextApiResponse} from 'next'

const handler: NextApiHandler = async (
  req: NextApiRequest,
  res: NextApiResponse
) => {

  const body = req.body

  const {
    projectId,
    dataset,
    documentId,
    revisionId,
    // we're not using `before` in this example, but we could use it to generate a diff
    // before,
    after,
    operation,
    author,
    // note this time will not be exactly the same as the actual transaction time
    // as this is the time when the webhook projection was run.
    // You can get the exact mutation time with an additional lookup to the transaction API if needed
    logTime,
  } = body

  const userResponse = await fetch(
    `https://${projectId}.api.sanity.io/v2022-04-29/users/${author}`,
    {
      headers: {
        Authorization: `Bearer ${sanityToken}`
      }
    }
  )

  const authorResult = await userResponse.json()

  const {
    displayName,
    email,
    sanityUserId,
    provider
  } = authorResult

  const logEntry = {
    user: {
      displayName,
      email,
      sanityUserId,
      provider
    },
    operation,
    projectId,
    dataset,
    documentId,
    revisionId,
    logTime,
    // here we're passing along the document
    // as it appears after the mutation.
    // We could also build a diff or send the "before" version
    updatedDocumentValue: after,
  }

  console.log('Send this to our logs =>', logEntry)

  return res.status(200).send('Log processed OK')
}

export default handler