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73 lines
1.8 KiB
73 lines
1.8 KiB
import contractMap from '@metamask/contract-metadata';
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import { isValidAddress, checksumAddress, isHex } from './util';
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let iconFactory;
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export default function iconFactoryGenerator(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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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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let addr = address;
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if (isHex(address)) {
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addr = checksumAddress(address);
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}
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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 =
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this.cache[cacheId] ||
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(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(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 (
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contractMap[address] && isValidAddress(address) && contractMap[address].logo
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);
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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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