From a044a028616823027a25a860ed482be18585fd4a Mon Sep 17 00:00:00 2001 From: apanizo Date: Mon, 27 Aug 2018 18:07:34 +0200 Subject: [PATCH] Added Identicon react component --- src/components/Identicon/blockies.js | 366 +++++++++++++++++++++++++++ src/components/Identicon/index.jsx | 67 +++++ 2 files changed, 433 insertions(+) create mode 100644 src/components/Identicon/blockies.js create mode 100644 src/components/Identicon/index.jsx diff --git a/src/components/Identicon/blockies.js b/src/components/Identicon/blockies.js new file mode 100644 index 00000000..1123ab5e --- /dev/null +++ b/src/components/Identicon/blockies.js @@ -0,0 +1,366 @@ +/* eslint-disable */ +(function (global, factory) { + typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) : + typeof define === 'function' && define.amd ? define(['exports'], factory) : + (factory((global.blockies = {}))); +}(this, (function (exports) { + 'use strict'; + + /** + * A handy class to calculate color values. + * + * @version 1.0 + * @author Robert Eisele + * @copyright Copyright (c) 2010, Robert Eisele + * @link http://www.xarg.org/2010/03/generate-client-side-png-files-using-javascript/ + * @license http://www.opensource.org/licenses/bsd-license.php BSD License + * + */ + + + // helper functions for that ctx + function write(buffer, offs) { + for (var i = 2; i < arguments.length; i++) { + for (var j = 0; j < arguments[i].length; j++) { + buffer[offs++] = arguments[i].charAt(j); + } + } + } + + function byte2(w) { + return String.fromCharCode((w >> 8) & 255, w & 255); + } + + function byte4(w) { + return String.fromCharCode((w >> 24) & 255, (w >> 16) & 255, (w >> 8) & 255, w & 255); + } + + function byte2lsb(w) { + return String.fromCharCode(w & 255, (w >> 8) & 255); + } + + var PNG = function (width, height, depth) { + + this.width = width; + this.height = height; + this.depth = depth; + + // pixel data and row filter identifier size + this.pix_size = height * (width + 1); + + // deflate header, pix_size, block headers, adler32 checksum + this.data_size = 2 + this.pix_size + 5 * Math.floor((0xfffe + this.pix_size) / 0xffff) + 4; + + // offsets and sizes of Png chunks + this.ihdr_offs = 0; // IHDR offset and size + this.ihdr_size = 4 + 4 + 13 + 4; + this.plte_offs = this.ihdr_offs + this.ihdr_size; // PLTE offset and size + this.plte_size = 4 + 4 + 3 * depth + 4; + this.trns_offs = this.plte_offs + this.plte_size; // tRNS offset and size + this.trns_size = 4 + 4 + depth + 4; + this.idat_offs = this.trns_offs + this.trns_size; // IDAT offset and size + this.idat_size = 4 + 4 + this.data_size + 4; + this.iend_offs = this.idat_offs + this.idat_size; // IEND offset and size + this.iend_size = 4 + 4 + 4; + this.buffer_size = this.iend_offs + this.iend_size; // total PNG size + + this.buffer = new Array(); + this.palette = new Object(); + this.pindex = 0; + + var _crc32 = new Array(); + + // initialize buffer with zero bytes + for (var i = 0; i < this.buffer_size; i++) { + this.buffer[i] = "\x00"; + } + + // initialize non-zero elements + write(this.buffer, this.ihdr_offs, byte4(this.ihdr_size - 12), 'IHDR', byte4(width), byte4(height), "\x08\x03"); + write(this.buffer, this.plte_offs, byte4(this.plte_size - 12), 'PLTE'); + write(this.buffer, this.trns_offs, byte4(this.trns_size - 12), 'tRNS'); + write(this.buffer, this.idat_offs, byte4(this.idat_size - 12), 'IDAT'); + write(this.buffer, this.iend_offs, byte4(this.iend_size - 12), 'IEND'); + + // initialize deflate header + var header = ((8 + (7 << 4)) << 8) | (3 << 6); + header += 31 - (header % 31); + + write(this.buffer, this.idat_offs + 8, byte2(header)); + + // initialize deflate block headers + for (var i = 0; (i << 16) - 1 < this.pix_size; i++) { + var size, bits; + if (i + 0xffff < this.pix_size) { + size = 0xffff; + bits = "\x00"; + } else { + size = this.pix_size - (i << 16) - i; + bits = "\x01"; + } + write(this.buffer, this.idat_offs + 8 + 2 + (i << 16) + (i << 2), bits, byte2lsb(size), byte2lsb(~size)); + } + + /* Create crc32 lookup table */ + for (var i = 0; i < 256; i++) { + var c = i; + for (var j = 0; j < 8; j++) { + if (c & 1) { + c = -306674912 ^ ((c >> 1) & 0x7fffffff); + } else { + c = (c >> 1) & 0x7fffffff; + } + } + _crc32[i] = c; + } + + // compute the index into a png for a given pixel + this.index = function (x, y) { + var i = y * (this.width + 1) + x + 1; + var j = this.idat_offs + 8 + 2 + 5 * Math.floor((i / 0xffff) + 1) + i; + return j; + }; + + // convert a color and build up the palette + this.color = function (red, green, blue, alpha) { + + alpha = alpha >= 0 ? alpha : 255; + var color = (((((alpha << 8) | red) << 8) | green) << 8) | blue; + + if (typeof this.palette[color] == "undefined") { + if (this.pindex == this.depth) return "\x00"; + + var ndx = this.plte_offs + 8 + 3 * this.pindex; + + this.buffer[ndx + 0] = String.fromCharCode(red); + this.buffer[ndx + 1] = String.fromCharCode(green); + this.buffer[ndx + 2] = String.fromCharCode(blue); + this.buffer[this.trns_offs + 8 + this.pindex] = String.fromCharCode(alpha); + + this.palette[color] = String.fromCharCode(this.pindex++); + } + return this.palette[color]; + }; + + // output a PNG string, Base64 encoded + this.getBase64 = function () { + + var s = this.getDump(); + + var ch = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; + var c1, c2, c3, e1, e2, e3, e4; + var l = s.length; + var i = 0; + var r = ""; + + do { + c1 = s.charCodeAt(i); + e1 = c1 >> 2; + c2 = s.charCodeAt(i + 1); + e2 = ((c1 & 3) << 4) | (c2 >> 4); + c3 = s.charCodeAt(i + 2); + if (l < i + 2) { e3 = 64; } else { e3 = ((c2 & 0xf) << 2) | (c3 >> 6); } + if (l < i + 3) { e4 = 64; } else { e4 = c3 & 0x3f; } + r += ch.charAt(e1) + ch.charAt(e2) + ch.charAt(e3) + ch.charAt(e4); + } while ((i += 3) < l); + return r; + }; + + // output a PNG string + this.getDump = function () { + + // compute adler32 of output pixels + row filter bytes + var BASE = 65521; /* largest prime smaller than 65536 */ + var NMAX = 5552; /* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */ + var s1 = 1; + var s2 = 0; + var n = NMAX; + + for (var y = 0; y < this.height; y++) { + for (var x = -1; x < this.width; x++) { + s1 += this.buffer[this.index(x, y)].charCodeAt(0); + s2 += s1; + if ((n -= 1) == 0) { + s1 %= BASE; + s2 %= BASE; + n = NMAX; + } + } + } + s1 %= BASE; + s2 %= BASE; + write(this.buffer, this.idat_offs + this.idat_size - 8, byte4((s2 << 16) | s1)); + + // compute crc32 of the PNG chunks + function crc32(png, offs, size) { + var crc = -1; + for (var i = 4; i < size - 4; i += 1) { + crc = _crc32[(crc ^ png[offs + i].charCodeAt(0)) & 0xff] ^ ((crc >> 8) & 0x00ffffff); + } + write(png, offs + size - 4, byte4(crc ^ -1)); + } + + crc32(this.buffer, this.ihdr_offs, this.ihdr_size); + crc32(this.buffer, this.plte_offs, this.plte_size); + crc32(this.buffer, this.trns_offs, this.trns_size); + crc32(this.buffer, this.idat_offs, this.idat_size); + crc32(this.buffer, this.iend_offs, this.iend_size); + + // convert PNG to string + return "\x89PNG\r\n\x1A\n" + this.buffer.join(''); + }; + + this.fillRect = function (x, y, w, h, color) { + for (var i = 0; i < w; i++) { + for (var j = 0; j < h; j++) { + this.buffer[this.index(x + i, y + j)] = color; + } + } + }; + }; + + // https://stackoverflow.com/questions/2353211/hsl-to-rgb-color-conversion + /** + * Converts an HSL color value to RGB. Conversion formula + * adapted from http://en.wikipedia.org/wiki/HSL_color_space. + * Assumes h, s, and l are contained in the set [0, 1] and + * returns r, g, and b in the set [0, 255]. + * + * @param {number} h The hue + * @param {number} s The saturation + * @param {number} l The lightness + * @return {Array} The RGB representation + */ + + function hue2rgb(p, q, t) { + if (t < 0) t += 1; + if (t > 1) t -= 1; + if (t < 1 / 6) return p + (q - p) * 6 * t; + if (t < 1 / 2) return q; + if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6; + return p; + } + + function hsl2rgb(h, s, l) { + var r, g, b; + + if (s == 0) { + r = g = b = l; // achromatic + } else { + var q = l < 0.5 ? l * (1 + s) : l + s - l * s; + var p = 2 * l - q; + r = hue2rgb(p, q, h + 1 / 3); + g = hue2rgb(p, q, h); + b = hue2rgb(p, q, h - 1 / 3); + } + + return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255), 255]; + } + + // The random number is a js implementation of the Xorshift PRNG + var randseed = new Array(4); // Xorshift: [x, y, z, w] 32 bit values + + function seedrand(seed) { + for (var i = 0; i < randseed.length; i++) { + randseed[i] = 0; + } + for (var i = 0; i < seed.length; i++) { + randseed[i % 4] = (randseed[i % 4] << 5) - randseed[i % 4] + seed.charCodeAt(i); + } + } + + function rand() { + // based on Java's String.hashCode(), expanded to 4 32bit values + var t = randseed[0] ^ (randseed[0] << 11); + + randseed[0] = randseed[1]; + randseed[1] = randseed[2]; + randseed[2] = randseed[3]; + randseed[3] = randseed[3] ^ (randseed[3] >> 19) ^ t ^ (t >> 8); + + return (randseed[3] >>> 0) / (1 << 31 >>> 0); + } + + function createColor() { + //saturation is the whole color spectrum + var h = Math.floor(rand() * 360); + //saturation goes from 40 to 100, it avoids greyish colors + var s = rand() * 60 + 40; + //lightness can be anything from 0 to 100, but probabilities are a bell curve around 50% + var l = (rand() + rand() + rand() + rand()) * 25; + + return [h / 360, s / 100, l / 100]; + } + + function createImageData(size) { + var width = size; // Only support square icons for now + var height = size; + + var dataWidth = Math.ceil(width / 2); + var mirrorWidth = width - dataWidth; + + var data = []; + for (var y = 0; y < height; y++) { + var row = []; + for (var x = 0; x < dataWidth; x++) { + // this makes foreground and background color to have a 43% (1/2.3) probability + // spot color has 13% chance + row[x] = Math.floor(rand() * 2.3); + } + var r = row.slice(0, mirrorWidth); + r.reverse(); + row = row.concat(r); + + for (var i = 0; i < row.length; i++) { + data.push(row[i]); + } + } + + return data; + } + + function buildOpts(opts) { + if (!opts.seed) { + throw 'No seed provided' + } + + seedrand(opts.seed); + + return Object.assign({ + size: 8, + scale: 16, + color: createColor(), + bgcolor: createColor(), + spotcolor: createColor(), + }, opts) + } + + function toDataUrl(address) { + const opts = buildOpts({ seed: address.toLowerCase() }); + + const imageData = createImageData(opts.size); + const width = Math.sqrt(imageData.length); + + const p = new PNG(opts.size * opts.scale, opts.size * opts.scale, 3); + const bgcolor = p.color(...hsl2rgb(...opts.bgcolor)); + const color = p.color(...hsl2rgb(...opts.color)); + const spotcolor = p.color(...hsl2rgb(...opts.spotcolor)); + + for (var i = 0; i < imageData.length; i++) { + var row = Math.floor(i / width); + var col = i % width; + // if data is 0, leave the background + if (imageData[i]) { + // if data is 2, choose spot color, if 1 choose foreground + const pngColor = imageData[i] == 1 ? color : spotcolor; + p.fillRect(col * opts.scale, row * opts.scale, opts.scale, opts.scale, pngColor); + } + } + return `data:image/png;base64,${p.getBase64()}`; + } + + exports.toDataUrl = toDataUrl; + + Object.defineProperty(exports, '__esModule', { value: true }); + +}))); diff --git a/src/components/Identicon/index.jsx b/src/components/Identicon/index.jsx new file mode 100644 index 00000000..a6b3fecd --- /dev/null +++ b/src/components/Identicon/index.jsx @@ -0,0 +1,67 @@ +// @flow +import * as React from 'react' +import { toDataUrl } from './blockies' + +type Props = { + address: string, + diameter: number, +} + +type IdenticonRef = { current: null | HTMLDivElement } + +export default class Identicon extends React.PureComponent { + constructor(props: Props) { + super(props) + + this.identicon = React.createRef() + } + + componentDidMount = () => { + const { address, diameter } = this.props + const image = this.generateBlockieIdenticon(address, diameter) + if (this.identicon.current) { + this.identicon.current.appendChild(image) + } + } + + componentDidUpdate = () => { + const { address, diameter } = this.props + const image = this.generateBlockieIdenticon(address, diameter) + + if (!this.identicon.current) { + return + } + + const { children } = this.identicon.current + for (let i = 0; i < children.length; i += 1) { + this.identicon.current.removeChild(children[i]) + } + + this.identicon.current.appendChild(image) + } + + getStyleFrom = (diameter: number) => ({ + width: diameter, + height: diameter, + }) + + generateBlockieIdenticon = (address: string, diameter: number) => { + const image = new window.Image() + image.src = toDataUrl(address) + image.height = diameter + image.width = diameter + image.style.borderRadius = `${diameter / 2}px` + + return image + } + + identicon: IdenticonRef + + render() { + const style = this.getStyleFrom(this.props.diameter) + + return ( +
+ ) + } +}