2023-05-02 23:59:16 +02:00
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<!DOCTYPE html>
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<html th:lang="${#locale.language}" th:lang-direction="#{language.direction}" xmlns:th="http://www.thymeleaf.org">
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<head>
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<th:block th:insert="~{fragments/common :: head(title=#{extractImages.title})}"></th:block>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>PDF Signature App</title>
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<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.0/dist/css/bootstrap.min.css" rel="stylesheet">
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<script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.12.313/pdf.min.js"></script>
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<script src="https://unpkg.com/pdf-lib@1.18.0/dist/umd/pdf-lib.min.js"></script>
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<script src="https://cdn.jsdelivr.net/npm/signature_pad@4.1.5/dist/signature_pad.umd.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/interact.js/1.10.11/interact.min.js"></script>
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<style>
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#pdf-container {
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position: relative;
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}
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#pdf-canvas {
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border: 1px solid black;
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margin-top: 10px;
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}
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#signature-canvas {
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border: 1px solid red;
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position: absolute;
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touch-action: none;
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top: 10px; /* Make sure this value matches the margin-top of #pdf-canvas */
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left: 0;
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}
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2023-05-03 23:07:51 +02:00
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#signature-pad-container {
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border: 1px solid black;
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display: block;
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text-align: center;
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padding: 15px;
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}
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#signature-pad-canvas {
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background: rgba(125,125,125,0.2);
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}
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#pdf-canvas {
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width: 100%;
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}
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2023-05-02 23:59:16 +02:00
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</style>
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</head>
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<body>
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<th:block th:insert="~{fragments/common.html :: game}"></th:block>
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<div id="page-container">
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<div id="content-wrap">
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<div th:insert="~{fragments/navbar.html :: navbar}"></div>
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<br> <br>
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<div class="container">
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<div class="row justify-content-center">
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<div class="col-md-6">
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<h2 th:text="#{extractImages.header}"></h2>
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<div th:replace="~{fragments/common :: fileSelector(name='pdf-upload', multiple=false, accept='application/pdf')}"></div>
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<div class = "btn-group">
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<input type="radio" class="btn-check" name="signature-type" id="draw-signature" autocomplete="off" checked>
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<label class="btn btn-outline-secondary" for="draw-signature">Draw signature</label>
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<input type="radio" class="btn-check" name="signature-type" id="generate-signature" autocomplete="off">
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<label class="btn btn-outline-secondary" for="generate-signature">Generate Signature</label>
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<input type="radio" class="btn-check" name="signature-type" id="import-image" autocomplete="off">
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<label class="btn btn-outline-secondary" for="import-image">Import image</label>
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</div>
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<div th:replace="~{fragments/common :: fileSelector(name='signature-upload', multiple=false, accept='image/*', inputText=#{imgPrompt})}"></div>
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<!-- Signature Pad -->
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<div id="signature-pad-container">
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<canvas id="signature-pad-canvas"></canvas>
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<br>
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<button id="clear-signature" class="btn btn-outline-danger mt-2">Clear</button>
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<button id="save-signature" class="btn btn-outline-success mt-2">Save</button>
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</div>
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<div id="signature-text-input-container" style="display: none;">
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<input type="text" id="signature-text-input" class="form-control mt-2" placeholder="Type your signature here...">
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</div>
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<div id="pdf-container">
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<canvas id="pdf-canvas"></canvas>
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<canvas id="signature-canvas" hidden style="position: absolute;" data-scale="1"></canvas>
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</div>
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<button id="download-pdf" class="btn btn-primary mb-2">Download PDF</button>
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</div>
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</div>
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</div>
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</div>
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<div th:insert="~{fragments/footer.html :: footer}"></div>
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</div>
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<script>
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document.addEventListener('DOMContentLoaded', () => {
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const pdfUpload = document.querySelector('input[name=pdf-upload]');
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const signatureUpload = document.querySelector('input[name=signature-upload]');
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const signatureTextInput = document.querySelector('input[name=signatureTextInput]');
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const pdfCanvas = document.getElementById('pdf-canvas');
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const signatureCanvas = document.getElementById('signature-canvas');
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const downloadPdfBtn = document.getElementById('download-pdf');
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const signaturePadContainer = document.getElementById('signature-pad-container')
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const signaturePadCanvas = document.getElementById('signature-pad-canvas');
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const clearSignatureBtn = document.getElementById('clear-signature');
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const saveSignatureBtn = document.getElementById('save-signature');
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document.querySelector('input[name=signature-upload]').closest(".custom-file-chooser").style.display = "none"
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const signaturePad = new SignaturePad(signaturePadCanvas, {
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minWidth: 1,
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maxWidth: 2,
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penColor: 'black',
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});
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const pdfCtx = pdfCanvas.getContext('2d');
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let pdfDoc = null;
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pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.12.313/pdf.worker.min.js';
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pdfUpload.addEventListener('change', async (event) => {
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const file = event.target.files[0];
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if (file) {
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const pdfData = await file.arrayBuffer();
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pdfDoc = await pdfjsLib.getDocument({ data: pdfData }).promise;
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renderPage(1);
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}
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});
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clearSignatureBtn.addEventListener('click', () => {
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signaturePad.clear();
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});
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2023-05-05 00:19:05 +02:00
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$("input[name=signature-type]").change(function () {
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const drawSignatureInput = document.getElementById("draw-signature");
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const generateSignatureInput = document.getElementById("generate-signature");
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const importImageInputContainer = document.querySelector("input[name=signature-upload]").closest(".custom-file-chooser");
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signaturePadContainer.style.display = drawSignatureInput.checked ? "block" : "none";
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importImageInputContainer.style.display = drawSignatureInput.checked ? "none" : (generateSignatureInput.checked ? "none" : "block");
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document.getElementById("signature-text-input-container").style.display = generateSignatureInput.checked ? "block" : "none";
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if (drawSignatureInput.checked) {
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populateSignatureFromPad();
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} else if (generateSignatureInput.checked) {
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populateSignatureFromText();
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} else {
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populateSignatureFromFileUpload();
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}
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});
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function populateSignatureFromText() {
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const signatureText = document.getElementById("signature-text-input").value;
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if (!signatureText) return;
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const canvas = document.createElement("canvas");
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const ctx = canvas.getContext("2d");
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ctx.font = "32px Arial";
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const textMetrics = ctx.measureText(signatureText);
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canvas.width = textMetrics.width;
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canvas.height = parseInt(ctx.font, 10);
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ctx.fillStyle = "black";
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ctx.font = "32px Arial";
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ctx.fillText(signatureText, 0, canvas.height * 0.8);
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const dataURL = canvas.toDataURL();
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populateSignature(dataURL);
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}
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function populateSignature(imgUrl) {
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const img = new Image();
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img.onload = () => {
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const ctx = signatureCanvas.getContext('2d');
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ctx.clearRect(0, 0, signatureCanvas.width, signatureCanvas.height);
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signatureCanvas.width = img.width;
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signatureCanvas.height = img.height;
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ctx.drawImage(img, 0, 0, img.width, img.height);
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signatureCanvas.hidden = false;
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const x = 0;
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const y = 0;
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signatureCanvas.style.transform = `translate(${x}px, ${y}px)`;
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signatureCanvas.setAttribute('data-x', x);
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signatureCanvas.setAttribute('data-y', y);
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// calcualte the max size
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const containerWidth = parseInt(getComputedStyle(pdfCanvas).width.replace('px',''));
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const containerHeight = parseInt(getComputedStyle(pdfCanvas).height.replace('px',''));
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const containerAspectRatio = containerWidth / containerHeight;
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const imgAspectRatio = img.width / img.height;
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if (imgAspectRatio > containerAspectRatio) {
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const width = Math.min(img.width, containerWidth);
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signatureCanvas.style.width = width+'px';
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signatureCanvas.style.height = (width/imgAspectRatio)+'px';
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} else {
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const height = Math.min(img.height, containerHeight);
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signatureCanvas.style.width = (height*imgAspectRatio)+'px';
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signatureCanvas.style.height = height+'px';
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}
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};
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img.src = imgUrl;
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}
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function populateSignatureFromFileUpload() {
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const file = signatureUpload.files[0];
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if (!file) return;
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const reader = new FileReader();
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reader.onload = (e) => populateSignature(e.target.result);
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reader.readAsDataURL(file);
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}
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function populateSignatureFromPad() {
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if (signaturePad.isEmpty()) return;
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const dataURL = signaturePad.toDataURL();
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populateSignature(dataURL);
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}
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signatureUpload.addEventListener('change', populateSignatureFromFileUpload);
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signatureTextInput.addEventListener('change', populateSignatureFromText);
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saveSignatureBtn.addEventListener('click', populateSignatureFromPad);
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function renderPage(pageNum) {
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pdfDoc.getPage(pageNum).then((page) => {
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const viewport = page.getViewport({ scale: 1 });
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pdfCanvas.width = viewport.width;
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pdfCanvas.height = viewport.height;
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const renderCtx = {
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canvasContext: pdfCtx,
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viewport: viewport,
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};
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page.render(renderCtx);
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});
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}
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interact('#signature-canvas')
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.draggable({
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listeners: {
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move: (event) => {
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const target = event.target;
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const x = (parseFloat(target.getAttribute('data-x')) || 0) + event.dx;
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const y = (parseFloat(target.getAttribute('data-y')) || 0) + event.dy;
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target.style.transform = `translate(${x}px, ${y}px)`;
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target.setAttribute('data-x', x);
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target.setAttribute('data-y', y);
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},
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},
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})
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.resizable({
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edges: { left: true, right: true, bottom: true, top: true },
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listeners: {
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move: (event) => {
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const target = event.target;
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const x = (parseFloat(target.getAttribute('data-x')) || 0);
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const y = (parseFloat(target.getAttribute('data-y')) || 0);
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const newWidth = event.rect.width;
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const newHeight = event.rect.height;
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const scale = newWidth / target.width;
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target.style.width = newWidth + 'px';
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target.style.height = newHeight + 'px';
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target.setAttribute('data-scale', scale);
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target.style.transform = `translate(${x}px, ${y}px)`;
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},
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},
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modifiers: [
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interact.modifiers.restrictSize({
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min: { width: 50, height: 50 },
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}),
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],
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inertia: true,
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});
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2023-05-03 23:07:51 +02:00
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async function getSignatureImage() {
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const dataURL = signatureCanvas.toDataURL();
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return dataURLToArrayBuffer(dataURL);
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}
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2023-05-02 23:59:16 +02:00
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2023-05-03 23:07:51 +02:00
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downloadPdfBtn.addEventListener('click', async () => {
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if (pdfDoc) {
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const pdfBytes = await pdfDoc.getData();
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const pdfDocModified = await PDFLib.PDFDocument.load(pdfBytes);
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if (signatureCanvas) {
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const signatureBytes = await getSignatureImage();
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const signatureImageObject = await pdfDocModified.embedPng(signatureBytes);
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const pageIndex = 0; // Choose the page index where the signature should be added (0 is the first page)
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const page = pdfDocModified.getPages()[pageIndex];
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const targetElement = signatureCanvas;
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const x = parseFloat(targetElement.getAttribute('data-x')) || 0;
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const y = parseFloat(targetElement.getAttribute('data-y')) || 0;
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const scale = parseFloat(targetElement.getAttribute('data-scale')) || 1;
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page.drawImage(signatureImageObject, {
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x: x,
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y: page.getHeight() - y - (targetElement.height * scale),
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width: targetElement.width * scale,
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height: targetElement.height * scale,
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});
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}
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const modifiedPdfBytes = await pdfDocModified.save();
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|
const blob = new Blob([modifiedPdfBytes], { type: 'application/pdf' });
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const link = document.createElement('a');
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link.href = URL.createObjectURL(blob);
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link.download = 'signed-document.pdf';
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link.click();
|
2023-05-02 23:59:16 +02:00
|
|
|
}
|
2023-05-03 23:07:51 +02:00
|
|
|
});
|
2023-05-02 23:59:16 +02:00
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|
2023-05-03 23:07:51 +02:00
|
|
|
async function dataURLToArrayBuffer(dataURL) {
|
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|
const response = await fetch(dataURL);
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|
|
|
|
return response.arrayBuffer();
|
2023-05-02 23:59:16 +02:00
|
|
|
}
|
2023-05-03 23:07:51 +02:00
|
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|
2023-05-02 23:59:16 +02:00
|
|
|
});
|
2023-05-03 23:07:51 +02:00
|
|
|
</script>
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|
|
</body>
|
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|
|
</html>
|
