kamp/Stirling-PDF
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flatten pdf

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This commit is contained in:
Anthony Stirling 2023-05-04 23:19:05 +01:00
parent a342def43f
commit acda1e4dd8
4 changed files with 243 additions and 97 deletions
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47
src/main/resources/static/js/local-pdf-input-download.js Normal file
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@ -0,0 +1,47 @@
async function downloadFilesWithCallback(processFileCallback) {
const fileInput = document.querySelector('input[type="file"]');
const files = fileInput.files;
const zipThreshold = 4;
const zipFiles = files.length > zipThreshold;
let jszip = null;
if (zipFiles) {
jszip = new JSZip();
}
const promises = Array.from(files).map(async file => {
const { processedData, fileName } = await processFileCallback(file);
if (zipFiles) {
jszip.file(fileName, processedData);
} else {
const url = URL.createObjectURL(processedData);
const downloadOption = localStorage.getItem('downloadOption');
if (downloadOption === 'sameWindow') {
window.location.href = url;
} else if (downloadOption === 'newWindow') {
window.open(url, '_blank');
} else {
const downloadLink = document.createElement('a');
downloadLink.href = url;
downloadLink.download = fileName;
downloadLink.click();
}
}
});
await Promise.all(promises);
if (zipFiles) {
const content = await jszip.generateAsync({ type: "blob" });
const url = URL.createObjectURL(content);
const a = document.createElement('a');
a.href = url;
a.download = "files.zip";
document.body.appendChild(a);
a.click();
a.remove();
}
}

190
src/main/resources/templates/fragments/common.html
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@ -205,7 +205,7 @@ document.addEventListener("DOMContentLoaded", function () {
</dialog>
</th:block>
<th:block th:fragment="fileSelector(name, multiple)" th:with="accept=${accept} ?: '*/*', inputText=${inputText} ?: #{pdfPrompt}">
<th:block th:fragment="fileSelector(name, multiple)" th:with="accept=${accept} ?: '*/*', inputText=${inputText} ?: #{pdfPrompt}, remoteCall=${remoteCall} ?: 'true'">
<script>
$(document).ready(function() {
$('form').submit(async function(event) {
@ -227,103 +227,109 @@ document.addEventListener("DOMContentLoaded", function () {
var multiple = [[${multiple}]] || false;
var override = $('#override').val() || '';
console.log("override=" + override)
if (override === 'multi' || (!multiple && files.length > 1) && override !== 'single' ) {
console.log("multi parallel download")
await submitMultiPdfForm(event,url);
} else {
console.log("start single download")
// Get the selected download option from localStorage
const downloadOption = localStorage.getItem('downloadOption');
var formData = new FormData($('form')[0]);
// Send the request to the server using the fetch() API
const response = await fetch(url, {
method: 'POST',
body: formData
});
try {
if (!response) {
throw new Error('Received null response for file ' + i);
}
console.log("load single download")
// Extract the filename from the Content-Disposition header, if present
let filename = null;
const contentDispositionHeader = response.headers.get('Content-Disposition');
console.log(contentDispositionHeader)
if (contentDispositionHeader && contentDispositionHeader.indexOf('attachment') !== -1) {
filename = decodeURIComponent(contentDispositionHeader.split('filename=')[1].replace(/"/g, ''));
} else {
// If the Content-Disposition header is not present or does not contain the filename, use a default filename
filename = 'download';
}
console.log("filename=" + filename)
const contentType = response.headers.get('Content-Type');
console.log("contentType=" + contentType)
// Check if the response is a PDF or an image
if (contentType.includes('pdf') || contentType.includes('image')) {
const blob = await response.blob();
console.log("pdf/image")
// Perform the appropriate action based on the download option
if (downloadOption === 'sameWindow') {
console.log("same window")
// Open the file in the same window
window.location.href = URL.createObjectURL(blob);
} else if (downloadOption === 'newWindow') {
console.log("new window")
// Open the file in a new window
window.open(URL.createObjectURL(blob), '_blank');
if([[${remoteCall}]] === true) {
if (override === 'multi' || (!multiple && files.length > 1) && override !== 'single' ) {
console.log("multi parallel download")
await submitMultiPdfForm(event,url);
} else {
console.log("start single download")
// Get the selected download option from localStorage
const downloadOption = localStorage.getItem('downloadOption');
var formData = new FormData($('form')[0]);
// Send the request to the server using the fetch() API
const response = await fetch(url, {
method: 'POST',
body: formData
});
try {
if (!response) {
throw new Error('Received null response for file ' + i);
}
console.log("load single download")
// Extract the filename from the Content-Disposition header, if present
let filename = null;
const contentDispositionHeader = response.headers.get('Content-Disposition');
console.log(contentDispositionHeader)
if (contentDispositionHeader && contentDispositionHeader.indexOf('attachment') !== -1) {
filename = decodeURIComponent(contentDispositionHeader.split('filename=')[1].replace(/"/g, ''));
} else {
console.log("else save")
// Download the file
// If the Content-Disposition header is not present or does not contain the filename, use a default filename
filename = 'download';
}
console.log("filename=" + filename)
const contentType = response.headers.get('Content-Type');
console.log("contentType=" + contentType)
// Check if the response is a PDF or an image
if (contentType.includes('pdf') || contentType.includes('image')) {
const blob = await response.blob();
console.log("pdf/image")
// Perform the appropriate action based on the download option
if (downloadOption === 'sameWindow') {
console.log("same window")
// Open the file in the same window
window.location.href = URL.createObjectURL(blob);
} else if (downloadOption === 'newWindow') {
console.log("new window")
// Open the file in a new window
window.open(URL.createObjectURL(blob), '_blank');
} else {
console.log("else save")
// Download the file
const link = document.createElement('a');
link.href = URL.createObjectURL(blob);
link.download = filename;
link.click();
}
} else if (contentType.includes('json')) {
// Handle the JSON response
const json = await response.json();
// Format the error message
const errorMessage = JSON.stringify(json, null, 2);
// Display the error message in an alert
alert(`An error occurred: ${errorMessage}`);
} else {
const blob = await response.blob()
console.log("else save 2 zip")
// For ZIP files or other file types, just download the file
const link = document.createElement('a');
link.href = URL.createObjectURL(blob);
link.download = filename;
link.click();
}
} else if (contentType.includes('json')) {
// Handle the JSON response
const json = await response.json();
// Format the error message
const errorMessage = JSON.stringify(json, null, 2);
// Display the error message in an alert
alert(`An error occurred: ${errorMessage}`);
} else {
const blob = await response.blob()
console.log("else save 2 zip")
} catch(error) {
console.log("error listener")
// Extract the error message and stack trace from the response
const errorMessage = error.message;
const stackTrace = error.stack;
// Create an error message to display to the user
const message = `${errorMessage}\n\n${stackTrace}`;
$('#submitBtn').text(submitButtonText);
// For ZIP files or other file types, just download the file
const link = document.createElement('a');
link.href = URL.createObjectURL(blob);
link.download = filename;
link.click();
}
} catch(error) {
console.log("error listener")
// Extract the error message and stack trace from the response
const errorMessage = error.message;
const stackTrace = error.stack;
// Create an error message to display to the user
const message = `${errorMessage}\n\n${stackTrace}`;
$('#submitBtn').text(submitButtonText);
// Display the error message to the user
alert(message);
};
// Display the error message to the user
alert(message);
};
}
} else {
//Offline do nothing and let other scripts handle everything
}
$('#submitBtn').text(submitButtonText);
});
@ -467,7 +473,7 @@ document.addEventListener("DOMContentLoaded", function () {
<div class="custom-file-chooser">
<div class="custom-file">
<input type="file" class="custom-file-input" th:name="${name}" th:id="${name}+'-input'" th:accept="${accept}" multiple>
<input type="file" class="custom-file-input" th:name="${name}" th:id="${name}+'-input'" th:accept="${accept}" multiple required>
<label class="custom-file-label" th:for="${name}+'-input'" th:text="${inputText}"></label>
</div>
<div class="selected-files"></div>

57
src/main/resources/templates/other/flatten.html Normal file
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@ -0,0 +1,57 @@
<!DOCTYPE html>
<html th:lang="${#locale.toString()}" th:lang-direction="#{language.direction}" xmlns:th="http://www.thymeleaf.org">
<th:block th:insert="~{fragments/common :: head(title=#{flatten.title})}"></th:block>
<body>
<div id="page-container">
<div id="content-wrap">
<div th:insert="~{fragments/navbar.html :: navbar}"></div>
<br> <br>
<div class="container">
<div class="row justify-content-center">
<div class="col-md-6">
<h2 th:text="#{flatten.header}"></h2>
<form id="pdfForm" class="mb-3">
<div class="custom-file">
<div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='application/pdf', remoteCall='false')}"></div>
</div>
<button type="submit" id="submitBtn" class="btn btn-primary" th:text="#{flatten.submit}"></button>
<script src="js/local-pdf-input-download.js"></script>
<script>
document.getElementById('pdfForm').addEventListener('submit', async (e) => {
e.preventDefault();
const { PDFDocument } = PDFLib;
const processFile = async (file) => {
const origFileUrl = URL.createObjectURL(file);
const formPdfBytes = await fetch(origFileUrl).then(res => res.arrayBuffer());
const pdfDoc = await PDFDocument.load(formPdfBytes);
const form = pdfDoc.getForm();
form.flatten();
const pdfBytes = await pdfDoc.save();
const pdfBlob = new Blob([pdfBytes], { type: 'application/pdf' });
const fileName = (file.name ? file.name.replace('.pdf', '') : 'pdf') + '_flattened.pdf';
return { processedData: pdfBlob, fileName };
};
await downloadFilesWithCallback(processFile);
});
</script>
</form>
</div>
</div>
</div>
</div>
<div th:insert="~{fragments/footer.html :: footer}"></div>
</div>
</body>
</html>

46
src/main/resources/templates/sign.html
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@ -60,8 +60,11 @@
<div class = "btn-group">
<input type="radio" class="btn-check" name="signature-type" id="draw-signature" autocomplete="off" checked>
<label class="btn btn-outline-secondary" for="draw-signature">Draw signature</label>
<input type="radio" class="btn-check" name="signature-type" id="generate-signature" autocomplete="off">
<label class="btn btn-outline-secondary" for="generate-signature">Generate Signature</label>
<input type="radio" class="btn-check" name="signature-type" id="import-image" autocomplete="off">
<label class="btn btn-outline-secondary" for="import-image">Import image</label>
</div>
<div th:replace="~{fragments/common :: fileSelector(name='signature-upload', multiple=false, accept='image/*', inputText=#{imgPrompt})}"></div>
@ -72,7 +75,11 @@
<button id="clear-signature" class="btn btn-outline-danger mt-2">Clear</button>
<button id="save-signature" class="btn btn-outline-success mt-2">Save</button>
</div>
<div id="signature-text-input-container" style="display: none;">
<input type="text" id="signature-text-input" class="form-control mt-2" placeholder="Type your signature here...">
</div>
<div id="pdf-container">
<canvas id="pdf-canvas"></canvas>
<canvas id="signature-canvas" hidden style="position: absolute;" data-scale="1"></canvas>
@ -89,6 +96,7 @@
document.addEventListener('DOMContentLoaded', () => {
const pdfUpload = document.querySelector('input[name=pdf-upload]');
const signatureUpload = document.querySelector('input[name=signature-upload]');
const signatureTextInput = document.querySelector('input[name=signatureTextInput]');
const pdfCanvas = document.getElementById('pdf-canvas');
const signatureCanvas = document.getElementById('signature-canvas');
const downloadPdfBtn = document.getElementById('download-pdf');
@ -124,17 +132,44 @@
signaturePad.clear();
});
$("input[name=signature-type]").change(function() {
const drawSignatureInput = document.getElementById('draw-signature');
signaturePadContainer.style.display = drawSignatureInput.checked ? 'block' : 'none';
document.querySelector('input[name=signature-upload]').closest(".custom-file-chooser").style.display = drawSignatureInput.checked ? 'none' : 'block';
$("input[name=signature-type]").change(function () {
const drawSignatureInput = document.getElementById("draw-signature");
const generateSignatureInput = document.getElementById("generate-signature");
const importImageInputContainer = document.querySelector("input[name=signature-upload]").closest(".custom-file-chooser");
signaturePadContainer.style.display = drawSignatureInput.checked ? "block" : "none";
importImageInputContainer.style.display = drawSignatureInput.checked ? "none" : (generateSignatureInput.checked ? "none" : "block");
document.getElementById("signature-text-input-container").style.display = generateSignatureInput.checked ? "block" : "none";
if (drawSignatureInput.checked) {
populateSignatureFromPad();
} else if (generateSignatureInput.checked) {
populateSignatureFromText();
} else {
populateSignatureFromFileUpload();
}
});
function populateSignatureFromText() {
const signatureText = document.getElementById("signature-text-input").value;
if (!signatureText) return;
const canvas = document.createElement("canvas");
const ctx = canvas.getContext("2d");
ctx.font = "32px Arial";
const textMetrics = ctx.measureText(signatureText);
canvas.width = textMetrics.width;
canvas.height = parseInt(ctx.font, 10);
ctx.fillStyle = "black";
ctx.font = "32px Arial";
ctx.fillText(signatureText, 0, canvas.height * 0.8);
const dataURL = canvas.toDataURL();
populateSignature(dataURL);
}
function populateSignature(imgUrl) {
const img = new Image();
@ -184,6 +219,7 @@
populateSignature(dataURL);
}
signatureUpload.addEventListener('change', populateSignatureFromFileUpload);
signatureTextInput.addEventListener('change', populateSignatureFromText);
saveSignatureBtn.addEventListener('click', populateSignatureFromPad);