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var iconFactory
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, imageify) {
if (imageify) {
return this.generateIdenticonImg(address, diameter)
} else {
return this.generateIdenticonSvg(address, diameter)
}
}
// returns img dom element
IconFactory.prototype.generateIdenticonImg = function (address, diameter) {
var identicon = this.generateIdenticonSvg(address, diameter)
var identiconSrc = identicon.innerHTML
var dataUri = toDataUri(identiconSrc)
var img = document.createElement('img')
img.src = dataUri
return img
}
// 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 jsNumberForAddress (address) {
var addr = address.slice(2, 10)
var seed = parseInt(addr, 16)
return seed
}
function toDataUri (identiconSrc) {
return 'data:image/svg+xml;charset=utf-8,' + encodeURIComponent(identiconSrc)
}
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