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