mirror of https://github.com/sgoudham/carbon.git
add /image api endpoint, use it to get carbon image if on safari
briandennis
7 years ago
committed by
Brian Dennis
parent
31a2c8cad3
commit
57dddd0b19
@ -0,0 +1,34 @@
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module.exports = browser => async (req, res) => {
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let page = await browser.newPage()
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let url = req.body.url
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if (!url) res.status(400).send()
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try {
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await page.goto(url)
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await page.addScriptTag({ path: `./lib/customDomToImage.js` })
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const targetElement = await page.$('#export-container')
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let dataUrl = await page.evaluate(target => {
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const config = {
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style: {
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transform: 'scale(2)',
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'transform-origin': 'center'
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},
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filter: n => (n.className ? String(n.className).indexOf('eliminateOnRender') < 0 : true),
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width: target.offsetWidth * 2,
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height: target.offsetHeight * 2
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}
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return domtoimage.toPng(target, config)
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}, targetElement)
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res.status(200).json({ dataUrl })
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} catch (e) {
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console.error(e)
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res.status(500).send()
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} finally {
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await page.close()
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}
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}
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@ -0,0 +1,766 @@
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;(function(global) {
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'use strict'
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var util = newUtil()
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var inliner = newInliner()
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var fontFaces = newFontFaces()
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var images = newImages()
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// Default impl options
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var defaultOptions = {
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// Default is to fail on error, no placeholder
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imagePlaceholder: undefined,
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// Default cache bust is false, it will use the cache
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cacheBust: false
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}
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var domtoimage = {
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toSvg: toSvg,
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toPng: toPng,
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toJpeg: toJpeg,
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toBlob: toBlob,
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toPixelData: toPixelData,
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impl: {
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fontFaces: fontFaces,
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images: images,
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util: util,
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inliner: inliner,
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options: {}
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}
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}
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global.domtoimage = domtoimage
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/**
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* @param {Node} node - The DOM Node object to render
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* @param {Object} options - Rendering options
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* @param {Function} options.filter - Should return true if passed node should be included in the output
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* (excluding node means excluding it's children as well). Not called on the root node.
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* @param {String} options.bgcolor - color for the background, any valid CSS color value.
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* @param {Number} options.width - width to be applied to node before rendering.
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* @param {Number} options.height - height to be applied to node before rendering.
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* @param {Object} options.style - an object whose properties to be copied to node's style before rendering.
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* @param {Number} options.quality - a Number between 0 and 1 indicating image quality (applicable to JPEG only),
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defaults to 1.0.
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* @param {String} options.imagePlaceholder - dataURL to use as a placeholder for failed images, default behaviour is to fail fast on images we can't fetch
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* @param {Boolean} options.cacheBust - set to true to cache bust by appending the time to the request url
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* @return {Promise} - A promise that is fulfilled with a SVG image data URL
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* */
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function toSvg(node, options) {
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options = options || {}
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copyOptions(options)
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return Promise.resolve(node)
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.then(function(node) {
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return cloneNode(node, options.filter, true)
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})
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.then(embedFonts)
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.then(inlineImages)
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.then(applyOptions)
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.then(function(clone) {
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return makeSvgDataUri(
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clone,
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options.width || util.width(node),
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options.height || util.height(node)
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)
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})
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function applyOptions(clone) {
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if (options.bgcolor) clone.style.backgroundColor = options.bgcolor
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if (options.width) clone.style.width = options.width + 'px'
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if (options.height) clone.style.height = options.height + 'px'
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if (options.style)
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Object.keys(options.style).forEach(function(property) {
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clone.style[property] = options.style[property]
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})
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return clone
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}
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}
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/**
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* @param {Node} node - The DOM Node object to render
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* @param {Object} options - Rendering options, @see {@link toSvg}
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* @return {Promise} - A promise that is fulfilled with a Uint8Array containing RGBA pixel data.
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* */
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function toPixelData(node, options) {
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return draw(node, options || {}).then(function(canvas) {
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return canvas.getContext('2d').getImageData(0, 0, util.width(node), util.height(node)).data
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})
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}
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/**
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* @param {Node} node - The DOM Node object to render
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* @param {Object} options - Rendering options, @see {@link toSvg}
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* @return {Promise} - A promise that is fulfilled with a PNG image data URL
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* */
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function toPng(node, options) {
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return draw(node, options || {}).then(function(canvas) {
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return canvas.toDataURL()
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})
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}
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/**
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* @param {Node} node - The DOM Node object to render
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* @param {Object} options - Rendering options, @see {@link toSvg}
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* @return {Promise} - A promise that is fulfilled with a JPEG image data URL
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* */
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function toJpeg(node, options) {
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options = options || {}
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return draw(node, options).then(function(canvas) {
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return canvas.toDataURL('image/jpeg', options.quality || 1.0)
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})
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}
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/**
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* @param {Node} node - The DOM Node object to render
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* @param {Object} options - Rendering options, @see {@link toSvg}
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* @return {Promise} - A promise that is fulfilled with a PNG image blob
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* */
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function toBlob(node, options) {
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return draw(node, options || {}).then(util.canvasToBlob)
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}
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function copyOptions(options) {
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// Copy options to impl options for use in impl
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if (typeof options.imagePlaceholder === 'undefined') {
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domtoimage.impl.options.imagePlaceholder = defaultOptions.imagePlaceholder
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} else {
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domtoimage.impl.options.imagePlaceholder = options.imagePlaceholder
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}
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if (typeof options.cacheBust === 'undefined') {
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domtoimage.impl.options.cacheBust = defaultOptions.cacheBust
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} else {
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domtoimage.impl.options.cacheBust = options.cacheBust
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}
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}
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function draw(domNode, options) {
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return toSvg(domNode, options)
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.then(util.makeImage)
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.then(util.delay(100))
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.then(function(image) {
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var canvas = newCanvas(domNode)
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canvas.getContext('2d').drawImage(image, 0, 0)
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return canvas
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})
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function newCanvas(domNode) {
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var canvas = document.createElement('canvas')
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canvas.width = options.width || util.width(domNode)
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canvas.height = options.height || util.height(domNode)
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if (options.bgcolor) {
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var ctx = canvas.getContext('2d')
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ctx.fillStyle = options.bgcolor
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ctx.fillRect(0, 0, canvas.width, canvas.height)
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}
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return canvas
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}
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}
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function cloneNode(node, filter, root) {
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if (!root && filter && !filter(node)) return Promise.resolve()
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return Promise.resolve(node)
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.then(makeNodeCopy)
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.then(function(clone) {
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return cloneChildren(node, clone, filter)
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})
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.then(function(clone) {
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return processClone(node, clone)
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})
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function makeNodeCopy(node) {
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if (node instanceof HTMLCanvasElement) return util.makeImage(node.toDataURL())
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return node.cloneNode(false)
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}
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function cloneChildren(original, clone, filter) {
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var children = original.childNodes
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if (children.length === 0) return Promise.resolve(clone)
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return cloneChildrenInOrder(clone, util.asArray(children), filter).then(function() {
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return clone
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})
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function cloneChildrenInOrder(parent, children, filter) {
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var done = Promise.resolve()
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children.forEach(function(child) {
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done = done
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.then(function() {
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return cloneNode(child, filter)
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})
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.then(function(childClone) {
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if (childClone) parent.appendChild(childClone)
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})
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})
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return done
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}
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}
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function processClone(original, clone) {
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if (!(clone instanceof Element)) return clone
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return Promise.resolve()
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.then(cloneStyle)
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.then(clonePseudoElements)
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.then(copyUserInput)
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.then(fixSvg)
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.then(function() {
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return clone
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})
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function cloneStyle() {
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copyStyle(window.getComputedStyle(original), clone.style)
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function copyStyle(source, target) {
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if (source.cssText) target.cssText = source.cssText
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else copyProperties(source, target)
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function copyProperties(source, target) {
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util.asArray(source).forEach(function(name) {
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target.setProperty(
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name,
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source.getPropertyValue(name),
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source.getPropertyPriority(name)
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)
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})
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}
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}
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}
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function clonePseudoElements() {
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;[':before', ':after'].forEach(function(element) {
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clonePseudoElement(element)
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})
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function clonePseudoElement(element) {
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var style = window.getComputedStyle(original, element)
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var content = style.getPropertyValue('content')
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if (content === '' || content === 'none') return
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var className = util.uid()
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clone.className = clone.className + ' ' + className
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var styleElement = document.createElement('style')
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styleElement.appendChild(formatPseudoElementStyle(className, element, style))
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clone.appendChild(styleElement)
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function formatPseudoElementStyle(className, element, style) {
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var selector = '.' + className + ':' + element
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var cssText = style.cssText ? formatCssText(style) : formatCssProperties(style)
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return document.createTextNode(selector + '{' + cssText + '}')
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function formatCssText(style) {
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var content = style.getPropertyValue('content')
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return style.cssText + ' content: ' + content + ';'
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}
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function formatCssProperties(style) {
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return (
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util
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.asArray(style)
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.map(formatProperty)
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.join('; ') + ';'
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)
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function formatProperty(name) {
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return (
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name +
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': ' +
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style.getPropertyValue(name) +
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(style.getPropertyPriority(name) ? ' !important' : '')
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)
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}
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}
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}
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}
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}
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function copyUserInput() {
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if (original instanceof HTMLTextAreaElement) clone.innerHTML = original.value
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if (original instanceof HTMLInputElement) clone.setAttribute('value', original.value)
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}
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function fixSvg() {
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if (!(clone instanceof SVGElement)) return
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clone.setAttribute('xmlns', 'http://www.w3.org/2000/svg')
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if (!(clone instanceof SVGRectElement)) return
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;['width', 'height'].forEach(function(attribute) {
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var value = clone.getAttribute(attribute)
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if (!value) return
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clone.style.setProperty(attribute, value)
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})
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}
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}
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}
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function embedFonts(node) {
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return fontFaces.resolveAll().then(function(cssText) {
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var styleNode = document.createElement('style')
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node.appendChild(styleNode)
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styleNode.appendChild(document.createTextNode(cssText))
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return node
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})
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}
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function inlineImages(node) {
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return images.inlineAll(node).then(function() {
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return node
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})
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}
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function makeSvgDataUri(node, width, height) {
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return Promise.resolve(node)
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.then(function(node) {
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node.setAttribute('xmlns', 'http://www.w3.org/1999/xhtml')
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return new XMLSerializer().serializeToString(node)
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})
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.then(util.escapeXhtml)
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.then(function(xhtml) {
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return '<foreignObject x="0" y="0" width="100%" height="100%">' + xhtml + '</foreignObject>'
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})
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.then(function(foreignObject) {
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return (
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'<svg xmlns="http://www.w3.org/2000/svg" width="' +
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width +
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'" height="' +
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height +
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'">' +
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foreignObject +
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'</svg>'
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)
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})
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.then(function(svg) {
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return 'data:image/svg+xml;charset=utf-8,' + svg
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})
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}
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function newUtil() {
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return {
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escape: escape,
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parseExtension: parseExtension,
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mimeType: mimeType,
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dataAsUrl: dataAsUrl,
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isDataUrl: isDataUrl,
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canvasToBlob: canvasToBlob,
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resolveUrl: resolveUrl,
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getAndEncode: getAndEncode,
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uid: uid(),
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delay: delay,
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asArray: asArray,
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escapeXhtml: escapeXhtml,
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makeImage: makeImage,
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width: width,
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height: height
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}
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function mimes() {
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/*
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* Only WOFF and EOT mime types for fonts are 'real'
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* see http://www.iana.org/assignments/media-types/media-types.xhtml
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*/
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var WOFF = 'application/font-woff'
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var JPEG = 'image/jpeg'
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return {
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woff: WOFF,
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woff2: WOFF,
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ttf: 'application/font-truetype',
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eot: 'application/vnd.ms-fontobject',
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png: 'image/png',
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jpg: JPEG,
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jpeg: JPEG,
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gif: 'image/gif',
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tiff: 'image/tiff',
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svg: 'image/svg+xml'
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}
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}
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function parseExtension(url) {
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var match = /\.([^\.\/]*?)$/g.exec(url)
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if (match) return match[1]
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else return ''
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}
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function mimeType(url) {
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var extension = parseExtension(url).toLowerCase()
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return mimes()[extension] || ''
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}
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function isDataUrl(url) {
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return url.search(/^(data:)/) !== -1
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}
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function toBlob(canvas) {
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return new Promise(function(resolve) {
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var binaryString = window.atob(canvas.toDataURL().split(',')[1])
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var length = binaryString.length
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var binaryArray = new Uint8Array(length)
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for (var i = 0; i < length; i++) binaryArray[i] = binaryString.charCodeAt(i)
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resolve(
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new Blob([binaryArray], {
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type: 'image/png'
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})
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)
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})
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}
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function canvasToBlob(canvas) {
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if (canvas.toBlob)
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return new Promise(function(resolve) {
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canvas.toBlob(resolve)
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})
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return toBlob(canvas)
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}
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|
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function resolveUrl(url, baseUrl) {
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var doc = document.implementation.createHTMLDocument()
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var base = doc.createElement('base')
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doc.head.appendChild(base)
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var a = doc.createElement('a')
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doc.body.appendChild(a)
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base.href = baseUrl
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a.href = url
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return a.href
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}
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function uid() {
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var index = 0
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return function() {
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return 'u' + fourRandomChars() + index++
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function fourRandomChars() {
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/* see http://stackoverflow.com/a/6248722/2519373 */
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return ('0000' + ((Math.random() * Math.pow(36, 4)) << 0).toString(36)).slice(-4)
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}
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}
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}
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function makeImage(uri) {
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return new Promise(function(resolve, reject) {
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var image = new Image()
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image.onload = function() {
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resolve(image)
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}
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image.onerror = reject
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image.src = uri
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})
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}
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function getAndEncode(url) {
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var TIMEOUT = 30000
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if (domtoimage.impl.options.cacheBust) {
|
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// Cache bypass so we dont have CORS issues with cached images
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// Source: https://developer.mozilla.org/en/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest#Bypassing_the_cache
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url += (/\?/.test(url) ? '&' : '?') + new Date().getTime()
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}
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|
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return new Promise(function(resolve) {
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var request = new XMLHttpRequest()
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request.onreadystatechange = done
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request.ontimeout = timeout
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request.responseType = 'blob'
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request.timeout = TIMEOUT
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request.open('GET', url, true)
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request.send()
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|
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var placeholder
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if (domtoimage.impl.options.imagePlaceholder) {
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var split = domtoimage.impl.options.imagePlaceholder.split(/,/)
|
||||
if (split && split[1]) {
|
||||
placeholder = split[1]
|
||||
}
|
||||
}
|
||||
|
||||
function done() {
|
||||
if (request.readyState !== 4) return
|
||||
|
||||
if (request.status !== 200) {
|
||||
if (placeholder) {
|
||||
resolve(placeholder)
|
||||
} else {
|
||||
fail('cannot fetch resource: ' + url + ', status: ' + request.status)
|
||||
}
|
||||
|
||||
return
|
||||
}
|
||||
|
||||
var encoder = new FileReader()
|
||||
encoder.onloadend = function() {
|
||||
var content = encoder.result.split(/,/)[1]
|
||||
resolve(content)
|
||||
}
|
||||
encoder.readAsDataURL(request.response)
|
||||
}
|
||||
|
||||
function timeout() {
|
||||
if (placeholder) {
|
||||
resolve(placeholder)
|
||||
} else {
|
||||
fail('timeout of ' + TIMEOUT + 'ms occured while fetching resource: ' + url)
|
||||
}
|
||||
}
|
||||
|
||||
function fail(message) {
|
||||
console.error(message)
|
||||
resolve('')
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
function dataAsUrl(content, type) {
|
||||
return 'data:' + type + ';base64,' + content
|
||||
}
|
||||
|
||||
function escape(string) {
|
||||
return string.replace(/([.*+?^${}()|\[\]\/\\])/g, '\\$1')
|
||||
}
|
||||
|
||||
function delay(ms) {
|
||||
return function(arg) {
|
||||
return new Promise(function(resolve) {
|
||||
setTimeout(function() {
|
||||
resolve(arg)
|
||||
}, ms)
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
function asArray(arrayLike) {
|
||||
var array = []
|
||||
var length = arrayLike.length
|
||||
for (var i = 0; i < length; i++) array.push(arrayLike[i])
|
||||
return array
|
||||
}
|
||||
|
||||
function escapeXhtml(string) {
|
||||
return string.replace(/#/g, '%23').replace(/\n/g, '%0A')
|
||||
}
|
||||
|
||||
function width(node) {
|
||||
var leftBorder = px(node, 'border-left-width')
|
||||
var rightBorder = px(node, 'border-right-width')
|
||||
return node.scrollWidth + leftBorder + rightBorder
|
||||
}
|
||||
|
||||
function height(node) {
|
||||
var topBorder = px(node, 'border-top-width')
|
||||
var bottomBorder = px(node, 'border-bottom-width')
|
||||
return node.scrollHeight + topBorder + bottomBorder
|
||||
}
|
||||
|
||||
function px(node, styleProperty) {
|
||||
var value = window.getComputedStyle(node).getPropertyValue(styleProperty)
|
||||
return parseFloat(value.replace('px', ''))
|
||||
}
|
||||
}
|
||||
|
||||
function newInliner() {
|
||||
var URL_REGEX = /url\(['"]?([^'"]+?)['"]?\)/g
|
||||
|
||||
return {
|
||||
inlineAll: inlineAll,
|
||||
shouldProcess: shouldProcess,
|
||||
impl: {
|
||||
readUrls: readUrls,
|
||||
inline: inline
|
||||
}
|
||||
}
|
||||
|
||||
function shouldProcess(string) {
|
||||
return string.search(URL_REGEX) !== -1
|
||||
}
|
||||
|
||||
function readUrls(string) {
|
||||
var result = []
|
||||
var match
|
||||
while ((match = URL_REGEX.exec(string)) !== null) {
|
||||
result.push(match[1])
|
||||
}
|
||||
return result.filter(function(url) {
|
||||
return !util.isDataUrl(url)
|
||||
})
|
||||
}
|
||||
|
||||
function inline(string, url, baseUrl, get) {
|
||||
return Promise.resolve(url)
|
||||
.then(function(url) {
|
||||
return baseUrl ? util.resolveUrl(url, baseUrl) : url
|
||||
})
|
||||
.then(get || util.getAndEncode)
|
||||
.then(function(data) {
|
||||
return util.dataAsUrl(data, util.mimeType(url))
|
||||
})
|
||||
.then(function(dataUrl) {
|
||||
return string.replace(urlAsRegex(url), '$1' + dataUrl + '$3')
|
||||
})
|
||||
|
||||
function urlAsRegex(url) {
|
||||
return new RegExp('(url\\([\'"]?)(' + util.escape(url) + ')([\'"]?\\))', 'g')
|
||||
}
|
||||
}
|
||||
|
||||
function inlineAll(string, baseUrl, get) {
|
||||
if (nothingToInline()) return Promise.resolve(string)
|
||||
|
||||
return Promise.resolve(string)
|
||||
.then(readUrls)
|
||||
.then(function(urls) {
|
||||
var done = Promise.resolve(string)
|
||||
urls.forEach(function(url) {
|
||||
done = done.then(function(string) {
|
||||
return inline(string, url, baseUrl, get)
|
||||
})
|
||||
})
|
||||
return done
|
||||
})
|
||||
|
||||
function nothingToInline() {
|
||||
return !shouldProcess(string)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
function newFontFaces() {
|
||||
return {
|
||||
resolveAll: resolveAll,
|
||||
impl: {
|
||||
readAll: readAll
|
||||
}
|
||||
}
|
||||
|
||||
function resolveAll() {
|
||||
return readAll(document)
|
||||
.then(function(webFonts) {
|
||||
return Promise.all(
|
||||
webFonts.map(function(webFont) {
|
||||
return webFont.resolve()
|
||||
})
|
||||
)
|
||||
})
|
||||
.then(function(cssStrings) {
|
||||
return cssStrings.join('\n')
|
||||
})
|
||||
}
|
||||
|
||||
function readAll() {
|
||||
return Promise.resolve(util.asArray(document.styleSheets))
|
||||
.then(getCssRules)
|
||||
.then(selectWebFontRules)
|
||||
.then(function(rules) {
|
||||
return rules.map(newWebFont)
|
||||
})
|
||||
|
||||
function selectWebFontRules(cssRules) {
|
||||
return cssRules
|
||||
.filter(function(rule) {
|
||||
return rule.type === CSSRule.FONT_FACE_RULE
|
||||
})
|
||||
.filter(function(rule) {
|
||||
return inliner.shouldProcess(rule.style.getPropertyValue('src'))
|
||||
})
|
||||
}
|
||||
|
||||
function getCssRules(styleSheets) {
|
||||
var cssRules = []
|
||||
styleSheets.forEach(function(sheet) {
|
||||
try {
|
||||
util.asArray(sheet.cssRules || []).forEach(cssRules.push.bind(cssRules))
|
||||
} catch (e) {
|
||||
console.log('Error while reading CSS rules from ' + sheet.href, e.toString())
|
||||
}
|
||||
})
|
||||
return cssRules
|
||||
}
|
||||
|
||||
function newWebFont(webFontRule) {
|
||||
return {
|
||||
resolve: function resolve() {
|
||||
var baseUrl = (webFontRule.parentStyleSheet || {}).href
|
||||
return inliner.inlineAll(webFontRule.cssText, baseUrl)
|
||||
},
|
||||
src: function() {
|
||||
return webFontRule.style.getPropertyValue('src')
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
function newImages() {
|
||||
return {
|
||||
inlineAll: inlineAll,
|
||||
impl: {
|
||||
newImage: newImage
|
||||
}
|
||||
}
|
||||
|
||||
function newImage(element) {
|
||||
return {
|
||||
inline: inline
|
||||
}
|
||||
|
||||
function inline(get) {
|
||||
if (util.isDataUrl(element.src)) return Promise.resolve()
|
||||
|
||||
return Promise.resolve(element.src)
|
||||
.then(get || util.getAndEncode)
|
||||
.then(function(data) {
|
||||
return util.dataAsUrl(data, util.mimeType(element.src))
|
||||
})
|
||||
.then(function(dataUrl) {
|
||||
return new Promise(function(resolve, reject) {
|
||||
element.onload = resolve
|
||||
element.onerror = reject
|
||||
element.src = dataUrl
|
||||
})
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
function inlineAll(node) {
|
||||
if (!(node instanceof Element)) return Promise.resolve(node)
|
||||
|
||||
return inlineBackground(node).then(function() {
|
||||
if (node instanceof HTMLImageElement) return newImage(node).inline()
|
||||
else
|
||||
return Promise.all(
|
||||
util.asArray(node.childNodes).map(function(child) {
|
||||
return inlineAll(child)
|
||||
})
|
||||
)
|
||||
})
|
||||
|
||||
function inlineBackground(node) {
|
||||
var background = node.style.getPropertyValue('background')
|
||||
|
||||
if (!background) return Promise.resolve(node)
|
||||
|
||||
return inliner
|
||||
.inlineAll(background)
|
||||
.then(function(inlined) {
|
||||
node.style.setProperty(
|
||||
'background',
|
||||
inlined,
|
||||
node.style.getPropertyPriority('background')
|
||||
)
|
||||
})
|
||||
.then(function() {
|
||||
return node
|
||||
})
|
||||
}
|
||||
}
|
||||
}
|
||||
})(this)
|
||||
Loading…
Reference in New Issue