Overleaf/services/web/scripts/get_emails_by_ids.mjs

import { scriptRunner } from './lib/ScriptRunner.mjs'
import fs from 'node:fs'
import readline from 'node:readline'
import minimist from 'minimist'
import { db, ObjectId } from '../app/src/infrastructure/mongodb.js'

/**
 * This script extracts user emails given a list of newline separated IDs
 *
 * Usage:
 *   - Locally:
 *     - docker compose exec web bash
 *     - node scripts/get_emails_by_ids.mjs
 *   - On the server:
 *     - rake run:pod[staging,web]
 *     - node scripts/get_emails_by_ids.mjs
 *     - exit
 *     - kubectl cp web-standalone-prod-XXXXX:/tmp/emails.txt ~/emails.txt
 */

function usage() {
  console.log(
    `
    User email extraction, outputs to /tmp/emails.txt

    Usage:
      node scripts/get_emails_by_ids.js [--inputPath=<path>] [--outputPath=<path>] [--batchSize=<number>]

    Options:
    --help                     Show this screen

    --inputPath=<path>         Input file path (default: ids.txt)

    --outputPath=<path>        Output file path (default: /tmp/emails.txt)

    --batchSize=<number>       Number of emails to be fetched in one query

    Description:
    This script extracts user emails given a list of newline separated IDs
    `
  )
}

function parseArgs() {
  const argv = minimist(process.argv.slice(2), {
    string: ['inputPath', 'outputPath'],
    bool: ['help'],
    number: ['batchSize'],
    default: {
      help: false,
      inputPath: 'ids.txt',
      outputPath: '/tmp/emails.txt',
      batchSize: 1000,
    },
  })

  if (argv.help) {
    usage()
    process.exit(0)
  }

  return argv
}

async function processBatch(idBatch, writeStream) {
  try {
    const cursor = db.users
      .find({
        _id: { $in: idBatch },
      })
      .project({
        _id: 0,
        email: 1,
      })

    for await (const doc of cursor) {
      if (doc.email) {
        writeStream.write(doc.email + '\n')
      }
    }
  } catch (err) {
    console.error('Error processing batch:', err)
  }
}

async function main(trackProgress) {
  const args = parseArgs()

  const readStream = fs.createReadStream(args.inputPath)
  const writeStream = fs.createWriteStream(args.outputPath)
  const rl = readline.createInterface({
    input: readStream,
    crlfDelay: Infinity,
  })

  let idBatch = []

  for await (const line of rl) {
    const id = line.trim()
    if (id) {
      try {
        idBatch.push(new ObjectId(id))
      } catch (e) {
        console.warn(`Skipping invalid ObjectId: ${id}`)
      }
    }

    if (idBatch.length >= args.batchSize) {
      await processBatch(idBatch, writeStream)
      idBatch = []
    }
  }

  if (idBatch.length > 0) {
    await processBatch(idBatch, writeStream)
  }

  writeStream.end()

  console.log(`✅ Success! Found emails written to ${args.outputPath}`)
  await trackProgress('Job finished')
}

try {
  await scriptRunner(main)
  process.exit(0)
} catch (error) {
  console.error(error)
  process.exit(1)
}