112 lines
3.4 KiB
JavaScript
112 lines
3.4 KiB
JavaScript
/**
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* @typedef {{
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* imageBase64: string,
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* imageBase64Full: string,
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* imageName: string,
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* imageSize: number,
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* }} FunctionReturn
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*/
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/**
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* ==============================================================================
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* Main Function
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* ==============================================================================
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* @async
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*
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* @param {{
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* imageInputFile: { name:string },
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* maxWidth: number,
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* imagePreviewNode: HTMLImageElement,
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* }} params - Single object passed
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*
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* @returns { Promise<FunctionReturn> } - Return Object
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*/
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module.exports = async function imageInputFileToBase64({ imageInputFile, maxWidth, imagePreviewNode }) {
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/**
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* Make https request
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*
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* @description make a request to datasquirel.com
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*/
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try {
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let imageName = imageInputFile.name.replace(/\..*/, "");
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let imageDataBase64;
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let imageSize;
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let canvas = document.createElement("canvas");
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const MIME_TYPE = imageInputFile.type;
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const QUALITY = 0.95;
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const MAX_WIDTH = maxWidth ? maxWidth : null;
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const file = imageInputFile; // get the file
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const blobURL = URL.createObjectURL(file);
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const img = new Image();
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/** ********************* Add source to new image */
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img.src = blobURL;
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imageDataBase64 = await new Promise((res, rej) => {
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/** ********************* Handle Errors in loading image */
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img.onerror = function () {
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URL.revokeObjectURL(this.src);
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console.log("Cannot load image");
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};
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/** ********************* Handle new image when loaded */
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img.onload = function () {
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URL.revokeObjectURL(this.src);
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if (MAX_WIDTH) {
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const scaleSize = MAX_WIDTH / img.naturalWidth;
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canvas.width = img.naturalWidth < MAX_WIDTH ? img.naturalWidth : MAX_WIDTH;
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canvas.height = img.naturalWidth < MAX_WIDTH ? img.naturalHeight : img.naturalHeight * scaleSize;
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} else {
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canvas.width = img.naturalWidth;
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canvas.height = img.naturalHeight;
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}
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const ctx = canvas.getContext("2d");
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ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
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const srcEncoded = canvas.toDataURL(MIME_TYPE, QUALITY);
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if (imagePreviewNode) {
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imagePreviewNode.src = srcEncoded;
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}
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res(srcEncoded);
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};
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});
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imageSize = await new Promise((res, rej) => {
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canvas.toBlob(
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(blob) => {
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res(blob.size);
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},
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MIME_TYPE,
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QUALITY
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);
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});
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return {
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imageBase64: imageDataBase64.replace(/.*?base64,/, ""),
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imageBase64Full: imageDataBase64,
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imageName: imageName,
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imageSize: imageSize,
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};
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} catch (error) {
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console.log("Image Processing Error! =>", error.message);
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return {
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imageBase64: null,
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imageBase64Full: null,
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imageName: null,
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imageSize: null,
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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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