You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
65 lines
1.8 KiB
65 lines
1.8 KiB
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
|
|
}
|
|
|
|
|