var iconFactory const isValidAddress = require('ethereumjs-util').isValidAddress const { checksumAddress } = require('../app/helpers/utils/util') const contractMap = require('eth-contract-metadata') module.exports = function (jazzicon) { if (!iconFactory) { iconFactory = new IconFactory(jazzicon) } return iconFactory } function IconFactory (jazzicon) { this.jazzicon = jazzicon this.cache = {} } IconFactory.prototype.iconForAddress = function (address, diameter) { const addr = checksumAddress(address) if (iconExistsFor(addr)) { return imageElFor(addr) } return this.generateIdenticonSvg(address, diameter) } // returns svg dom element IconFactory.prototype.generateIdenticonSvg = function (address, diameter) { var cacheId = `${address}:${diameter}` // check cache, lazily generate and populate cache var identicon = this.cache[cacheId] || (this.cache[cacheId] = this.generateNewIdenticon(address, diameter)) // create a clean copy so you can modify it var cleanCopy = identicon.cloneNode(true) return cleanCopy } // creates a new identicon IconFactory.prototype.generateNewIdenticon = function (address, diameter) { var numericRepresentation = jsNumberForAddress(address) var identicon = this.jazzicon(diameter, numericRepresentation) return identicon } // util function iconExistsFor (address) { return contractMap[address] && isValidAddress(address) && contractMap[address].logo } function imageElFor (address) { const contract = contractMap[address] const fileName = contract.logo const path = `images/contract/${fileName}` const img = document.createElement('img') img.src = path img.style.width = '100%' return img } function jsNumberForAddress (address) { var addr = address.slice(2, 10) var seed = parseInt(addr, 16) return seed }