271 lines
8.0 KiB
TypeScript
271 lines
8.0 KiB
TypeScript
import { PDFPageProxy } from 'pdfjs-dist';
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import { BrowserPDF417Reader, BrowserMultiFormatReader } from '@zxing/browser';
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import * as pdfJSx from 'pdfjs-dist';
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import { BarcodeFormat, DecodeHintType, Result } from '@zxing/library';
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export type BillInfo = {
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header: string,
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currency: string,
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ammount: number,
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payerName: string,
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payerAddress: string,
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payerTown: string,
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payeeName: string,
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payeeAddress: string,
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payeeTown: string,
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IBAN: string,
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model: string,
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reference: string,
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code: string,
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description: string,
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};
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/**
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* Decodes a PDF417 barcode
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* @param text
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* @returns
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* @description
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* Example text: "HRVHUB30\nEUR\n000000000012422\nDEREŽIĆ NIKOLA\nULICA DIVKA BUDAKA 17/17\n10000 ZAGREB\nGPZ-Opskrba d.o.o.\nRadniÄ\u008dka cesta 1\n10000 Zagreb\nHR3623400091110343158\nHR05\n02964686-0307\nGASB\nAkontacijska rata za 01.2024.\n"
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*
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* Decoded into:
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* header: HRVHUB30
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* currency:EUR
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* ammount:000000000012422
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* payerName:DEREŽIĆ NIKOLA
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* payerAddress:ULICA DIVKA BUDAKA 17/17
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* payerTown:10000 ZAGREB
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* payeeName:GPZ-Opskrba d.o.o.
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* payeeAddress:RadniÄ\u008dka cesta 1
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* payeeTown:10000 Zagreb
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* IBAN:HR3623400091110343158
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* model:HR05
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* reference:02964686-0307
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* code:GASB
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* description:Akontacijska rata za 01.2024.
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*
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*/
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const parseHubText = (text: string) => {
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const [
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header,
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currency,
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ammount,
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payerName,
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payerAddress,
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payerTown,
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payeeName,
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payeeAddress,
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payeeTown,
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IBAN,
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model,
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reference,
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code,
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description,
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] = text.split('\n');
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return {
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header,
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currency,
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ammount: parseInt(ammount, 10),
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payerName,
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payerAddress,
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payerTown,
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payeeName,
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payeeAddress,
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payeeTown,
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IBAN,
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model,
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reference,
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code,
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description,
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};
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}
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/**
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* Render an image from the given file onto a canvas.
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* @param {File} imageFile - a file containing an image
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* @return {Promise<HTMLCanvasElement>} the canvas with the image rendered onto it
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*/
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const image2canvas = async function (imageFile:File): Promise<HTMLCanvasElement> {
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const reader = new FileReader();
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const canvas = await new Promise<HTMLCanvasElement>((resolve, reject) => {
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reader.onload = (progressEvent:ProgressEvent<FileReader>) => {
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const img = new Image();
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img.onload = () => {
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const canvas = document.createElement('canvas');
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const ctx = canvas.getContext('2d');
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canvas.width = img.width;
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canvas.height = img.height;
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if(!ctx) {
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reject("Context is not set")
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return;
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}
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ctx.drawImage(img, 0, 0);
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resolve(canvas);
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};
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const result = (progressEvent.target as FileReader).result;
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img.src = result as string;
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};
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reader.onerror = (e) => reject(e);
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reader.readAsDataURL(imageFile);
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});
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return(canvas);
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}
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/**
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* Render the first page of a PDF document onto a new canvas.
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* @param {File} pdfFile - a file containing a PDF document
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* @return {Promise<HTMLCanvasElement>} the canvas with the first page of the PDF
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*/
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const pdf2canvas = async function (pdfFile:File): Promise<HTMLCanvasElement> {
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const reader = new FileReader();
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const data = await new Promise<Uint8Array>((resolve, reject) => {
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reader.onload = (e) => resolve(new Uint8Array((e.target as FileReader).result as ArrayBuffer));
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reader.onerror = (e) => reject(e);
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reader.readAsArrayBuffer(pdfFile);
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});
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const pdfJS = await import('pdfjs-dist');
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// worker file was manually copied to the `public` folder
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pdfJS.GlobalWorkerOptions.workerSrc = window.location.origin + '/pdf.worker.min.mjs';
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const pdf = await pdfJS.getDocument(data).promise;
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const page: PDFPageProxy = await pdf.getPage(1);
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const scale = 4;
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const viewport = page.getViewport({ scale });
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const canvas = document.createElement('canvas');
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const context = canvas.getContext('2d');
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canvas.height = viewport.height;
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canvas.width = viewport.width;
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await page.render({ canvasContext: context as CanvasRenderingContext2D, viewport }).promise;
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return(canvas);
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}
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/**
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* Decodes PDF417 from image contained within the given canvas
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* */
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const decodeFromCanvas = async (canvas:HTMLCanvasElement) => {
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try {
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const hints = new Map();
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hints.set(DecodeHintType.POSSIBLE_FORMATS, [ BarcodeFormat.PDF_417 ]);
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hints.set(DecodeHintType.PURE_BARCODE, false);
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const codeReader = new BrowserPDF417Reader(hints);
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const result = await codeReader.decodeFromCanvas(canvas);
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return({
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billInfo: parseHubText(result.getText()),
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barcodeImage: copyBarcodeImage(canvas, result)
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})
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} catch(ex:any) {
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console.log(ex);
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return(null);
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}
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}
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/**
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* Copies bar code from the given canvas
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*
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*/
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const copyBarcodeImage = (canvas:HTMLCanvasElement, decoderResult:Result) => {
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// get coordinates of bar code
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const points = decoderResult.getResultPoints();
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// get outter coordinates of the bar code
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const codeLocation = points.reduce((acc, point) => {
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const x = point.getX();
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const y = point.getY();
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let result = {
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top: y < acc.top ? y: acc.top,
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left: x < acc.left ? x: acc.left,
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bottom: y > acc.bottom ? y: acc.bottom,
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right: x > acc.right ? x: acc.right
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};
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return({
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...result,
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width: result.right - result.left,
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height: result.bottom - result.top,
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});
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}, {
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top: Number.MAX_SAFE_INTEGER,
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left: Number.MAX_SAFE_INTEGER,
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bottom: 0,
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right: 0,
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width: 0,
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height: 0
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});
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// copy section of the canvas containing bar code to another canvas
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const tempCanvas = document.createElement('canvas');
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const tempContext = tempCanvas.getContext('2d');
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tempCanvas.width = codeLocation.width;
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tempCanvas.height = codeLocation.height;
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// Draw the portion of the original canvas onto the temporary canvas
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// Assuming you want to copy a 100x100 pixels square starting from (50, 50) of the original canvas
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tempContext?.drawImage(canvas, codeLocation.left, codeLocation.top, codeLocation.width, codeLocation.height, 0, 0, codeLocation.width, codeLocation.height);
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// Convert the temporary canvas to a data URL
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const dataURL = tempCanvas.toDataURL();
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// Create a new Image object
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const barcodeImage = new Image();
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// Set the src of the image object to the data URL
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barcodeImage.src = dataURL;
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return(barcodeImage);
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}
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/** Finds PDF417 code within a file and decodes it */
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const decodeFromFile = async (file:File) => {
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switch(file.type) {
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case 'image/png':
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case 'image/jpeg':
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return(await decodeFromCanvas( await image2canvas(file) ));
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case 'application/pdf':
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return(await decodeFromCanvas( await pdf2canvas(file) ));
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default:
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console.error(file.name, 'is not a .pdf file.');
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return null;
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}
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}
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/**
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* Render the first page of a PDF document onto a new canvas.
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* @param {Event} event - The change event from an HTMLInputElement.
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* @return {Promise<HTMLCanvasElement | null>} The canvas with the first page of the PDF, or null if the document is not a PDF.
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*/
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export async function findDecodePdf417(event: React.ChangeEvent<HTMLInputElement>): Promise<{ billInfo: BillInfo, barcodeImage:HTMLImageElement } | null> {
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const file = (event.target as HTMLInputElement).files?.[0];
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if(!file) {
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console.error('No file was selected.');
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return null;
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}
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return(await decodeFromFile(file));
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} |