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60 lines
1.7 KiB
60 lines
1.7 KiB
var iconFactory
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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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this.jazzicon = jazzicon
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this.cache = {}
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}
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IconFactory.prototype.iconForAddress = function (address, diameter, imageify) {
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if (imageify) {
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return this.generateIdenticonImg(address, diameter)
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} else {
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return this.generateIdenticonSvg(address, diameter)
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}
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}
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// returns img dom element
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IconFactory.prototype.generateIdenticonImg = function (address, diameter) {
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var identicon = this.generateIdenticonSvg(address, diameter)
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var identiconSrc = identicon.innerHTML
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var dataUri = toDataUri(identiconSrc)
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var img = document.createElement('img')
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img.src = dataUri
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return img
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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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var cacheId = `${address}:${diameter}`
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// check cache, lazily generate and populate cache
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var 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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var 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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var numericRepresentation = jsNumberForAddress(address)
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var 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 jsNumberForAddress (address) {
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var addr = address.slice(2, 10)
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var seed = parseInt(addr, 16)
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return seed
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}
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function toDataUri (identiconSrc) {
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return 'data:image/svg+xml;charset=utf-8,' + encodeURIComponent(identiconSrc)
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}
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