imagehashgenerator

ObiWanBenoni — Yesterday at 10:06 AM
Hey.
You can use these two scripts to generate the hashes of all your images. They need to live in a directory called /images, you can then use the second script to take all these hashes and create a provenance hash and it also checks that each hash (image) is unique. 
'use strict';

const imagesDir = './images/';
const fs = require('fs');
const crypto = require('crypto');
const hashes = [];
const provenanceHash = ''

const createHashFromFile = filePath => new Promise(resolve => {
    const hash = crypto.createHash('sha256');
    fs.createReadStream(filePath).on('data', data => hash.update(data)).on('end', () => resolve(hash.digest('hex')));
  });

fs.readdir(imagesDir, (err, files) => {
  files.forEach(file => {    
    (async () => {
        const hash = await createHashFromFile(`${imagesDir}${file}`);
        console.log(`{"tokenId":${parseInt(file.replace('.png', ''))}, "hash":"${hash}"},`)
    })();
  });  
});

const fs = require('fs');
let obj = {};
let provenanceHash = '';

fs.readFile('image-hashes.json', handleFile)

function handleFile(err, data) {
    if (err) throw err
    obj = JSON.parse(data);
    
    obj.forEach(o => {
        if(obj.find(x => x.hash === o.hash && x.tokenId !== o.tokenId)) {
            console.error(`${o.tokenId} with hash (${o.hash}) is not unique`);
            throw err;
        } else {
            provenanceHash += o.hash;
        }
    });
    fs.writeFileSync("provenance-hash.txt", provenanceHash);
}