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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| 'use strict' | ||
|
|
||
| import FileUploader from '@elasticms/file-uploader' | ||
|
|
||
| async function resizeImage(hashAlgo, initUpload, fileHandler) { | ||
| return new Promise((resolve, reject) => { | ||
| const imageTypes = ['image/png','image/jpeg','image/webp'] | ||
| if (!imageTypes.includes(fileHandler.type)) { | ||
| resolve(null) | ||
| } | ||
|
|
||
| let fileHash = null | ||
| const reader = new FileReader() | ||
| const imageMaxSize = document.body.dataset.imageMaxSize | ||
| reader.onload = function (e) { | ||
| const image = new Image() | ||
| image.onload = function (imageEvent) { | ||
| const canvas = document.createElement('canvas') | ||
| let width = image.width | ||
| let height = image.height | ||
| if (width <= imageMaxSize && height <= imageMaxSize) { | ||
| resolve(null) | ||
| } | ||
| if (width > height) { | ||
| if (width > imageMaxSize) { | ||
| height = Math.round(height * imageMaxSize / width) | ||
| width = imageMaxSize | ||
| } | ||
| } else { | ||
| if (height > imageMaxSize) { | ||
| width = Math.round(width * imageMaxSize / height) | ||
| height = imageMaxSize | ||
| } | ||
| } | ||
| canvas.width = width | ||
| canvas.height = height | ||
| canvas.getContext('2d').drawImage(image, 0, 0, width, height) | ||
| const dataUrl = canvas.toDataURL(fileHandler.type) | ||
| const resizedImage = dataUrlToBlob(dataUrl) | ||
| let basename = fileHandler.name | ||
| let extension = '' | ||
| if(basename.lastIndexOf('.') !== -1) { | ||
| extension = basename.substring(basename.lastIndexOf(".")) | ||
| basename = basename.substring(0, basename.lastIndexOf(".")) | ||
| } | ||
| resizedImage.name = `${basename}_${width}x${height}${extension}` | ||
|
|
||
| const resizedImageUploader = new FileUploader({ | ||
| file: resizedImage, | ||
| algo: hashAlgo, | ||
| initUrl: initUpload, | ||
| emsListener: self, | ||
| onHashAvailable: function(hash){ | ||
| fileHash = hash | ||
| }, | ||
| onUploaded: function(assetUrl, previewUrl){ | ||
| resolve({ | ||
| hash: fileHash, | ||
| url: previewUrl, | ||
| }) | ||
| }, | ||
| onError: function(message, code){ | ||
| reject(`Error ${code} during upload of resized image with message: ${message}`) | ||
| }, | ||
| }) | ||
| } | ||
| image.src = e.target.result | ||
| } | ||
| reader.readAsDataURL(fileHandler) | ||
| }) | ||
| } | ||
|
|
||
| function dataUrlToBlob(dataUrl) { | ||
| const BASE64_MARKER = ';base64,' | ||
| if (dataUrl.indexOf(BASE64_MARKER) === -1) { | ||
| const parts = dataUrl.split(',') | ||
| const contentType = parts[0].split(':')[1] | ||
| const raw = parts[1] | ||
|
|
||
| return new Blob([raw], {type: contentType}) | ||
| } | ||
|
|
||
| const parts = dataUrl.split(BASE64_MARKER) | ||
| const contentType = parts[0].split(':')[1] | ||
| const raw = window.atob(parts[1]) | ||
| const rawLength = raw.length | ||
|
|
||
| const uInt8Array = new Uint8Array(rawLength) | ||
|
|
||
| for (let i = 0; i < rawLength; ++i) { | ||
| uInt8Array[i] = raw.charCodeAt(i) | ||
| } | ||
|
|
||
| return new Blob([uInt8Array], {type: contentType}) | ||
| } | ||
|
|
||
| export { resizeImage, dataUrlToBlob } |
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