handler_v1.js

const path = require('path')
const shelljs = require('shelljs')
const logger = require('./logger').logger
const db = require('./db')
const { whitelist } = require('utils')

const cliPath = path.join(
    __dirname,
    '..',
    'cli',
)

const cliCmd = `cd ${cliPath} && node build/index.js`

async function handler(req, res, dbClient) {
  let output, cmd, query, dbres
  let silent = true
  switch(req.body["method"]) {
    case "signup":
      if(!("pubkey" in req.body && req.body["pubkey"]) || !("maci" in req.body && req.body["maci"])){
         res.send("missing parameters...")
         break
      }
      
      const pubKey = req.body['pubkey']
      const maci = req.body['maci']

      if (!whitelist(pubKey) || !whitelist(maci)) break 

      query = { 'MACI': req.body["maci"]};
      dbres = await dbClient.db(db.dbName).collection(db.collectionName).findOne(query)
      if(!dbres) {
        res.send(`MACI contract address ${req.body["maci"]} not exist`)
        break
      }

      cmd = `${cliCmd} signup -p ${pubKey} -x ${maci}`
      logger.debug(`process signup...${cmd}`)
      output = shelljs.exec(cmd, { silent })
      break
    case "genkey":
      cmd = `${cliCmd} genMaciKeypair`
      logger.debug(`process genkey...${cmd}`)
      output = shelljs.exec(cmd, { silent })
      break
    case "publish": 
      if(!("pubkey" in req.body && req.body["pubkey"]) || !("maci" in req.body && req.body["maci"])){
         res.send("missing parameters...")
         break
      }

      if(
        !whitelist(req.body['pubKey']) || 
        !whitelist(req.body['maci']) || 
        !whitelist(req.body['privKey']) || 
        !whitelist(req.body["state_index"]) ||
        !whitelist(req.body["vote_option_index"]) ||
        !whitelist(req.body["new_vote_weight"]) ||
        !whitelist(req.body["nonce"]) ||
        !whitelist(req.body["poll_id"])
      ) break 

      query = { 'MACI': req.body["maci"]}
      dbres = await dbClient.db(db.dbName).collection(db.collectionName).findOne(query)
      if(!dbres) {
        res.send(`MACI contract address ${req.body["maci"]} not exist`)
        break
      }

      cmd = `${cliCmd} publish -p ${req.body["pubkey"]} -x ${req.body["maci"]} -sk ${req.body["privkey"]} -i ${req.body["state_index"]} -v ${req.body["vote_option_index"]} -w ${req.body["new_vote_weight"]} -n ${req.body["nonce"]} -o ${req.body["poll_id"]}`
      if (req.body["salt"]) {
        cmd += ` -s ${req.body["salt"]}`
      }
      logger.debug(`publishMessage...${cmd}`)
      output = shelljs.exec(cmd, { silent })
      break
    case "verify":
      if(!("maci" in req.body && req.body["maci"])||!("poll_id" in req.body && req.body["poll_id"])){
         res.send("missing parameters...")
         break
      }

      if (!whitelist(req.body['maci']) || !whitelist(req.body['poll_id'])) break 

      query = { 'MACI': req.body["maci"]}
      dbres = await dbClient.db(db.dbName).collection(db.collectionName).findOne(query)
      if(!dbres) {
        res.send(`MACI contract address ${req.body["maci"]} not exist`)
        break
      }
      const pptKey = "PollProcessorAndTally-" + req.body["poll_id"]
      if (!(pptKey in dbres)) {
         res.send(`PollProcessAndTally contract for poll ${req.body["poll_id"]} not exists`)
         break
      }
      pptAddr = dbres[pptKey]
      cmd = `${cliCmd} verify -t ${req.body["tally_file"]} -x ${req.body["maci"]} -o ${req.body["poll_id"]} -q ${pptAddr}`
      output = shelljs.exec(cmd, { silent })
      break
    default:
      res.send("unknown method...")
  }
  if (!output) {
      return
  } else if(output.stderr) {
     res.send(`${req.body.method} failed with error: ${output.stderr}`)
  } else {
    res.send(`${output}`)
  }
}

module.exports = handler;