calculate the provenance hash of a directory full of files (e.g. images). requires hardhat

calculate-provenance-hash.ts

// run the script with `npx hardhat run <script>`
import path from 'path'
import fs from 'fs'
import { createHash } from 'crypto'

const CSV_FILENAME = "provenance_record.csv"

async function main() {
    // CHANGE THE PATH HERE TO YOUR IMAGE COLLECTION PATH
    const imageDirectory = path.join(__dirname, '/../../images/output/image')
    const files = fs.readdirSync(imageDirectory)
    const hashes: string[] = []
    let csvData = "Index,Filename,Hash"

    // get every individual image hash
    for (let i = 0; i < files.length; i++) {
        const fp = path.join(imageDirectory, files[i])
        const fd = fs.readFileSync(fp)
        const hash = createHash('sha256').update(fd).digest('hex')
        hashes.push(hash)
        csvData += `\r\n${i},${files[i]},${hash}`
    }

    // make one big string and hash it
    const concatenatedHashString = hashes.join('')
    const result = createHash('sha256').update(concatenatedHashString).digest('hex')
    console.log(`Final hash: ${result}`)

    // write to csv because why not
    fs.writeFileSync(CSV_FILENAME, csvData)
    console.log(`CSV written to ${CSV_FILENAME}`)
}

main()
    .then(() => process.exit(0))
    .catch((error) => {
        console.error(error)
        process.exit(1)
    })