Generate x-signature

The x-signature and x-timestamp are required in headers of several APIs. Below is a tutorial on how to generate them.

1. Generate x-timestamp

x-timestamp is the current Unix timestamp in millisecond.

const x_timestamp = Date.now()

2. Create string for signature

Arrange the request parameters together with timestamp with key in ascending order .

function ksort(obj) {
  let sortObj = {}
  keys = Object.keys(obj)
  keys.sort()
  keys.forEach((key) => {
    sortObj[key] = obj[key]
  })
  return sortObj
}

const params = ksort({ ...request_parameters, "timestamp": x_timestamp })

Generate a string in the query format from sorted parameters, e.g. key1=value1&key2=value2

const qs = require('querystring')
const signString = qs.stringify(params)

3. Sign the signString with wallet

Use wallet's private key to sign the signString. Alternatively, you can use web3Providerto sign the message when deployed on a website.

const wallet = new ethers.Wallet(privateKey)
const x_signature = await wallet.signMessage(signString)