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{ Plugin } = require('@uppy/core')\nconst Translator = require('@uppy/utils/lib/Translator')\nconst dataURItoBlob = require('@uppy/utils/lib/dataURItoBlob')\nconst isObjectURL = require('@uppy/utils/lib/isObjectURL')\nconst isPreviewSupported = require('@uppy/utils/lib/isPreviewSupported')\nconst MathLog2 = require('math-log2') // Polyfill for IE.\nconst exifr = require('exifr/dist/mini.legacy.umd.js')\n\n/**\n * The Thumbnail Generator plugin\n */\n\nmodule.exports = class ThumbnailGenerator extends Plugin {\n static VERSION = require('../package.json').version\n\n constructor (uppy, opts) {\n super(uppy, opts)\n this.type = 'modifier'\n this.id = this.opts.id || 'ThumbnailGenerator'\n this.title = 'Thumbnail Generator'\n this.queue = []\n this.queueProcessing = false\n this.defaultThumbnailDimension = 200\n this.thumbnailType = this.opts.thumbnailType || 'image/jpeg'\n\n this.defaultLocale = {\n strings: {\n generatingThumbnails: 'Generating thumbnails...'\n }\n }\n\n const defaultOptions = {\n thumbnailWidth: null,\n thumbnailHeight: null,\n waitForThumbnailsBeforeUpload: false,\n lazy: false\n }\n\n this.opts = { ...defaultOptions, ...opts }\n\n if (this.opts.lazy && this.opts.waitForThumbnailsBeforeUpload) {\n throw new Error('ThumbnailGenerator: The `lazy` and `waitForThumbnailsBeforeUpload` options are mutually exclusive. Please ensure at most one of them is set to `true`.')\n }\n\n this.i18nInit()\n }\n\n setOptions (newOpts) {\n super.setOptions(newOpts)\n this.i18nInit()\n }\n\n i18nInit () {\n this.translator = new Translator([this.defaultLocale, this.uppy.locale, this.opts.locale])\n this.i18n = this.translator.translate.bind(this.translator)\n this.setPluginState() // so that UI re-renders and we see the updated locale\n }\n\n /**\n * Create a thumbnail for the given Uppy file object.\n *\n * @param {{data: Blob}} file\n * @param {number} targetWidth\n * @param {number} targetHeight\n * @returns {Promise}\n */\n createThumbnail (file, targetWidth, targetHeight) {\n // bug in the compatibility data\n // eslint-disable-next-line compat/compat\n const originalUrl = URL.createObjectURL(file.data)\n\n const onload = new Promise((resolve, reject) => {\n const image = new Image()\n image.src = originalUrl\n image.addEventListener('load', () => {\n // bug in the compatibility data\n // eslint-disable-next-line compat/compat\n URL.revokeObjectURL(originalUrl)\n resolve(image)\n })\n image.addEventListener('error', (event) => {\n // bug in the compatibility data\n // eslint-disable-next-line compat/compat\n URL.revokeObjectURL(originalUrl)\n reject(event.error || new Error('Could not create thumbnail'))\n })\n })\n\n const orientationPromise = exifr.rotation(file.data).catch(_err => 1)\n\n return Promise.all([onload, orientationPromise])\n .then(([image, orientation]) => {\n const dimensions = this.getProportionalDimensions(image, targetWidth, targetHeight, orientation.deg)\n const rotatedImage = this.rotateImage(image, orientation)\n const resizedImage = this.resizeImage(rotatedImage, dimensions.width, dimensions.height)\n return this.canvasToBlob(resizedImage, this.thumbnailType, 80)\n })\n .then(blob => {\n // bug in the compatibility data\n // eslint-disable-next-line compat/compat\n return URL.createObjectURL(blob)\n })\n }\n\n /**\n * Get the new calculated dimensions for the given image and a target width\n * or height. If both width and height are given, only width is taken into\n * account. If neither width nor height are given, the default dimension\n * is used.\n */\n getProportionalDimensions (img, width, height, rotation) {\n var aspect = img.width / img.height\n if (rotation === 90 || rotation === 270) {\n aspect = img.height / img.width\n }\n\n if (width != null) {\n return {\n width: width,\n height: Math.round(width / aspect)\n }\n }\n\n if (height != null) {\n return {\n width: Math.round(height * aspect),\n height: height\n }\n }\n\n return {\n width: this.defaultThumbnailDimension,\n height: Math.round(this.defaultThumbnailDimension / aspect)\n }\n }\n\n /**\n * Make sure the image doesn’t exceed browser/device canvas limits.\n * For ios with 256 RAM and ie\n */\n protect (image) {\n // https://stackoverflow.com/questions/6081483/maximum-size-of-a-canvas-element\n\n var ratio = image.width / image.height\n\n var maxSquare = 5000000 // ios max canvas square\n var maxSize = 4096 // ie max canvas dimensions\n\n var maxW = Math.floor(Math.sqrt(maxSquare * ratio))\n var maxH = Math.floor(maxSquare / Math.sqrt(maxSquare * ratio))\n if (maxW > maxSize) {\n maxW = maxSize\n maxH = Math.round(maxW / ratio)\n }\n if (maxH > maxSize) {\n maxH = maxSize\n maxW = Math.round(ratio * maxH)\n }\n if (image.width > maxW) {\n var canvas = document.createElement('canvas')\n canvas.width = maxW\n canvas.height = maxH\n canvas.getContext('2d').drawImage(image, 0, 0, maxW, maxH)\n image = canvas\n }\n\n return image\n }\n\n /**\n * Resize an image to the target `width` and `height`.\n *\n * Returns a Canvas with the resized image on it.\n */\n resizeImage (image, targetWidth, targetHeight) {\n // Resizing in steps refactored to use a solution from\n // https://blog.uploadcare.com/image-resize-in-browsers-is-broken-e38eed08df01\n\n image = this.protect(image)\n\n var steps = Math.ceil(MathLog2(image.width / targetWidth))\n if (steps < 1) {\n steps = 1\n }\n var sW = targetWidth * Math.pow(2, steps - 1)\n var sH = targetHeight * Math.pow(2, steps - 1)\n var x = 2\n\n while (steps--) {\n var canvas = document.createElement('canvas')\n canvas.width = sW\n canvas.height = sH\n canvas.getContext('2d').drawImage(image, 0, 0, sW, sH)\n image = canvas\n\n sW = Math.round(sW / x)\n sH = Math.round(sH / x)\n }\n\n return image\n }\n\n rotateImage (image, translate) {\n var w = image.width\n var h = image.height\n\n if (translate.deg === 90 || translate.deg === 270) {\n w = image.height\n h = image.width\n }\n\n var canvas = document.createElement('canvas')\n canvas.width = w\n canvas.height = h\n\n var context = canvas.getContext('2d')\n context.translate(w / 2, h / 2)\n if (translate.canvas) {\n context.rotate(translate.rad)\n context.scale(translate.scaleX, translate.scaleY)\n }\n context.drawImage(image, -image.width / 2, -image.height / 2, image.width, image.height)\n\n return canvas\n }\n\n /**\n * Save a <canvas> element's content to a Blob object.\n *\n * @param {HTMLCanvasElement} canvas\n * @returns {Promise}\n */\n canvasToBlob (canvas, type, quality) {\n try {\n canvas.getContext('2d').getImageData(0, 0, 1, 1)\n } catch (err) {\n if (err.code === 18) {\n return Promise.reject(new Error('cannot read image, probably an svg with external resources'))\n }\n }\n\n if (canvas.toBlob) {\n return new Promise(resolve => {\n canvas.toBlob(resolve, type, quality)\n }).then((blob) => {\n if (blob === null) {\n throw new Error('cannot read image, probably an svg with external resources')\n }\n return blob\n })\n }\n return Promise.resolve().then(() => {\n return dataURItoBlob(canvas.toDataURL(type, quality), {})\n }).then((blob) => {\n if (blob === null) {\n throw new Error('could not extract blob, probably an old browser')\n }\n return blob\n })\n }\n\n /**\n * Set the preview URL for a file.\n */\n setPreviewURL (fileID, preview) {\n this.uppy.setFileState(fileID, { preview })\n }\n\n addToQueue (item) {\n this.queue.push(item)\n if (this.queueProcessing === false) {\n this.processQueue()\n }\n }\n\n processQueue () {\n this.queueProcessing = true\n if (this.queue.length > 0) {\n const current = this.uppy.getFile(this.queue.shift())\n if (!current) {\n this.uppy.log('[ThumbnailGenerator] file was removed before a thumbnail could be generated, but not removed from the queue. This is probably a bug', 'error')\n return\n }\n return this.requestThumbnail(current)\n .catch(err => {}) // eslint-disable-line handle-callback-err\n .then(() => this.processQueue())\n } else {\n this.queueProcessing = false\n this.uppy.log('[ThumbnailGenerator] Emptied thumbnail queue')\n this.uppy.emit('thumbnail:all-generated')\n }\n }\n\n requestThumbnail (file) {\n if (isPreviewSupported(file.type) && !file.isRemote) {\n return this.createThumbnail(file, this.opts.thumbnailWidth, this.opts.thumbnailHeight)\n .then(preview => {\n this.setPreviewURL(file.id, preview)\n this.uppy.log(`[ThumbnailGenerator] Generated thumbnail for ${file.id}`)\n this.uppy.emit('thumbnail:generated', this.uppy.getFile(file.id), preview)\n })\n .catch(err => {\n this.uppy.log(`[ThumbnailGenerator] Failed thumbnail for ${file.id}:`, 'warning')\n this.uppy.log(err, 'warning')\n this.uppy.emit('thumbnail:error', this.uppy.getFile(file.id), err)\n })\n }\n return Promise.resolve()\n }\n\n onFileAdded = (file) => {\n if (!file.preview && isPreviewSupported(file.type) && !file.isRemote) {\n this.addToQueue(file.id)\n }\n }\n\n /**\n * Cancel a lazy request for a thumbnail if the thumbnail has not yet been generated.\n */\n onCancelRequest = (file) => {\n const index = this.queue.indexOf(file.id)\n if (index !== -1) {\n this.queue.splice(index, 1)\n }\n }\n\n /**\n * Clean up the thumbnail for a file. Cancel lazy requests and free the thumbnail URL.\n */\n onFileRemoved = (file) => {\n const index = this.queue.indexOf(file.id)\n if (index !== -1) {\n this.queue.splice(index, 1)\n }\n\n // Clean up object URLs.\n if (file.preview && isObjectURL(file.preview)) {\n URL.revokeObjectURL(file.preview)\n }\n }\n\n onRestored = () => {\n const { files } = this.uppy.getState()\n const fileIDs = Object.keys(files)\n fileIDs.forEach((fileID) => {\n const file = this.uppy.getFile(fileID)\n if (!file.isRestored) return\n // Only add blob URLs; they are likely invalid after being restored.\n if (!file.preview || isObjectURL(file.preview)) {\n this.addToQueue(file.id)\n }\n })\n }\n\n waitUntilAllProcessed = (fileIDs) => {\n fileIDs.forEach((fileID) => {\n const file = this.uppy.getFile(fileID)\n this.uppy.emit('preprocess-progress', file, {\n mode: 'indeterminate',\n message: this.i18n('generatingThumbnails')\n })\n })\n\n const emitPreprocessCompleteForAll = () => {\n fileIDs.forEach((fileID) => {\n const file = this.uppy.getFile(fileID)\n this.uppy.emit('preprocess-complete', file)\n })\n }\n\n return new Promise((resolve, reject) => {\n if (this.queueProcessing) {\n this.uppy.once('thumbnail:all-generated', () => {\n emitPreprocessCompleteForAll()\n resolve()\n })\n } else {\n emitPreprocessCompleteForAll()\n resolve()\n }\n })\n }\n\n install () {\n this.uppy.on('file-removed', this.onFileRemoved)\n if (this.opts.lazy) {\n this.uppy.on('thumbnail:request', this.onFileAdded)\n this.uppy.on('thumbnail:cancel', this.onCancelRequest)\n } else {\n this.uppy.on('file-added', this.onFileAdded)\n this.uppy.on('restored', this.onRestored)\n }\n\n if (this.opts.waitForThumbnailsBeforeUpload) {\n this.uppy.addPreProcessor(this.waitUntilAllProcessed)\n }\n }\n\n uninstall () {\n this.uppy.off('file-removed', this.onFileRemoved)\n if (this.opts.lazy) {\n this.uppy.off('thumbnail:request', this.onFileAdded)\n this.uppy.off('thumbnail:cancel', this.onCancelRequest)\n } else {\n this.uppy.off('file-added', this.onFileAdded)\n this.uppy.off('restored', this.onRestored)\n }\n\n if (this.opts.waitForThumbnailsBeforeUpload) {\n this.uppy.removePreProcessor(this.waitUntilAllProcessed)\n }\n }\n}\n"]} |