PDF Redaction Tool for Blogger

# PDF Redaction Tool for Blogger

Here's a complete JavaScript implementation for a PDF redaction tool similar to ilovepdf.com's redact-pdf functionality. This code can be pasted directly into your Blogger HTML/JavaScript gadget.

```html

<h2>PDF Redaction Tool</h2>

</svg>

</div>

<button class="btn-select" id="selectFileBtn">Select PDF File</button>

</div>

</svg>

</button>

</svg>

</button>

</svg>

</button>

</svg>

</button>

</div>

<button class="btn-download" id="downloadBtn">Download Redacted PDF</button>

</div>

</div>

<p>Processing PDF...</p>

</div>

<style>

.pdf-redact-container {

font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;

max-width: 900px;

margin: 0 auto;

padding: 20px;

background-color: #fff;

border-radius: 8px;

box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);

}

.pdf-redact-container h2 {

text-align: center;

color: #333;

margin-bottom: 20px;

}

.upload-area {

border: 2px dashed #ccc;

border-radius: 8px;

padding: 40px;

text-align: center;

cursor: pointer;

transition: all 0.3s;

background-color: #f9f9f9;

}

.upload-area:hover {

border-color: #4a89dc;

background-color: #f0f7ff;

}

.upload-icon svg {

width: 60px;

height: 60px;

color: #4a89dc;

margin-bottom: 15px;

}

.upload-area p {

margin: 10px 0;

color: #555;

font-size: 16px;

}

.or-text {

font-weight: bold;

color: #777 !important;

}

.btn-select {

background-color: #4a89dc;

color: white;

border: none;

padding: 10px 20px;

border-radius: 4px;

font-size: 16px;

cursor: pointer;

transition: background-color 0.3s;

}

.btn-select:hover {

background-color: #3a6cb4;

}

.editor-container {

margin-top: 20px;

}

.toolbar {

display: flex;

align-items: center;

gap: 10px;

padding: 10px;

background-color: #f5f5f5;

border-radius: 4px;

margin-bottom: 10px;

}

.tool-btn {

background: none;

border: 1px solid #ddd;

border-radius: 4px;

padding: 8px;

cursor: pointer;

transition: all 0.2s;

}

.tool-btn:hover {

background-color: #e9e9e9;

}

.tool-btn svg {

width: 20px;

height: 20px;

}

.color-picker input {

width: 30px;

height: 30px;

border: 1px solid #ddd;

border-radius: 4px;

cursor: pointer;

}

.btn-download {

margin-left: auto;

background-color: #37bc9b;

color: white;

border: none;

padding: 8px 16px;

border-radius: 4px;

font-size: 14px;

cursor: pointer;

transition: background-color 0.3s;

}

.btn-download:hover {

background-color: #2e9b81;

}

.pdf-viewer {

border: 1px solid #ddd;

border-radius: 4px;

height: 600px;

overflow: auto;

position: relative;

background-color: #f9f9f9;

}

.status-bar {

display: flex;

justify-content: space-between;

align-items: center;

padding: 8px 10px;

background-color: #f5f5f5;

border-radius: 0 0 4px 4px;

font-size: 14px;

color: #555;

}

.zoom-controls {

display: flex;

align-items: center;

gap: 5px;

}

.zoom-btn {

background-color: #ddd;

border: none;

border-radius: 3px;

width: 24px;

height: 24px;

display: flex;

align-items: center;

justify-content: center;

cursor: pointer;

}

.zoom-btn:hover {

background-color: #ccc;

}

.loading-overlay {

position: fixed;

top: 0;

left: 0;

right: 0;

bottom: 0;

background-color: rgba(255, 255, 255, 0.8);

display: flex;

flex-direction: column;

align-items: center;

justify-content: center;

z-index: 1000;

}

.spinner {

border: 5px solid #f3f3f3;

border-top: 5px solid #4a89dc;

border-radius: 50%;

width: 50px;

height: 50px;

animation: spin 1s linear infinite;

margin-bottom: 15px;

}

@keyframes spin {

0% { transform: rotate(0deg); }

100% { transform: rotate(360deg); }

}

.redaction-rect {

position: absolute;

background-color: black;

cursor: move;

}

.redaction-rect.selected {

border: 2px dashed #4a89dc;

}

.text-annotation {

position: absolute;

cursor: move;

user-select: none;

}

.highlight-annotation {

position: absolute;

background-color: rgba(255, 255, 0, 0.3);

cursor: move;

}

</style>

// PDF.js library - using CDN

const pdfjsLib = window['pdfjs-dist/build/pdf'];

pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.4.120/pdf.worker.min.js';

document.addEventListener('DOMContentLoaded', function() {

// DOM elements

const uploadArea = document.getElementById('uploadArea');

const fileInput = document.getElementById('fileInput');

const selectFileBtn = document.getElementById('selectFileBtn');

const editorContainer = document.getElementById('editorContainer');

const pdfViewer = document.getElementById('pdfViewer');

const loadingOverlay = document.getElementById('loadingOverlay');

const pageInfo = document.getElementById('pageInfo');

const zoomLevel = document.getElementById('zoomLevel');

const zoomInBtn = document.getElementById('zoomInBtn');

const zoomOutBtn = document.getElementById('zoomOutBtn');

const downloadBtn = document.getElementById('downloadBtn');

// Tool buttons

const redactBtn = document.getElementById('redactBtn');

const textBtn = document.getElementById('textBtn');

const highlightBtn = document.getElementById('highlightBtn');

const deleteBtn = document.getElementById('deleteBtn');

const colorPicker = document.getElementById('colorPicker');

// State variables

let pdfDoc = null;

let currentPage = 1;

let pageRendering = false;

let pageNumPending = null;

let scale = 1.0;

let canvas = null;

let ctx = null;

let annotations = [];

let currentTool = null;

let selectedAnnotation = null;

let isDragging = false;

let dragOffsetX = 0;

let dragOffsetY = 0;

// Initialize the application

init();

function init() {

// Event listeners

uploadArea.addEventListener('click', () => fileInput.click());

uploadArea.addEventListener('dragover', handleDragOver);

uploadArea.addEventListener('drop', handleDrop);

selectFileBtn.addEventListener('click', () => fileInput.click());

fileInput.addEventListener('change', handleFileSelect);

zoomInBtn.addEventListener('click', zoomIn);

zoomOutBtn.addEventListener('click', zoomOut);

downloadBtn.addEventListener('click', downloadRedactedPdf);

redactBtn.addEventListener('click', () => setTool('redact'));

textBtn.addEventListener('click', () => setTool('text'));

highlightBtn.addEventListener('click', () => setTool('highlight'));

deleteBtn.addEventListener('click', () => setTool('delete'));

// Initialize canvas

canvas = document.createElement('canvas');

pdfViewer.appendChild(canvas);

// Set default tool

setTool(null);

}

function handleDragOver(e) {

e.preventDefault();

e.stopPropagation();

uploadArea.style.borderColor = '#4a89dc';

uploadArea.style.backgroundColor = '#f0f7ff';

}

function handleDrop(e) {

e.preventDefault();

e.stopPropagation();

uploadArea.style.borderColor = '#ccc';

uploadArea.style.backgroundColor = '#f9f9f9';

if (e.dataTransfer.files.length > 0) {

const file = e.dataTransfer.files[0];

if (file.type === 'application/pdf' || file.name.endsWith('.pdf')) {

loadPdf(file);

} else {

alert('Please select a PDF file.');

}

function handleFileSelect(e) {

const file = e.target.files[0];

if (file) {

loadPdf(file);

}

function loadPdf(file) {

loadingOverlay.style.display = 'flex';

const fileReader = new FileReader();

fileReader.onload = function() {

const typedArray = new Uint8Array(this.result);

pdfjsLib.getDocument(typedArray).promise.then(function(pdf) {

pdfDoc = pdf;

loadingOverlay.style.display = 'none';

editorContainer.style.display = 'block';

uploadArea.style.display = 'none';

pageInfo.textContent = `Page 1 of ${pdf.numPages}`;

renderPage(1);

}).catch(function(error) {

loadingOverlay.style.display = 'none';

alert('Error loading PDF: ' + error.message);

});

};

fileReader.readAsArrayBuffer(file);

}

function renderPage(num) {

pageRendering = true;

pdfDoc.getPage(num).then(function(page) {

const viewport = page.getViewport({ scale: scale });

canvas.height = viewport.height;

canvas.width = viewport.width;

const renderContext = {

canvasContext: ctx || canvas.getContext('2d'),

viewport: viewport

};

const renderTask = page.render(renderContext);

renderTask.promise.then(function() {

pageRendering = false;

if (pageNumPending !== null) {

renderPage(pageNumPending);

pageNumPending = null;

}

// Draw annotations after page is rendered

drawAnnotations();

});

pageInfo.textContent = `Page ${num} of ${pdfDoc.numPages}`;

currentPage = num;

}

function queueRenderPage(num) {

if (pageRendering) {

pageNumPending = num;

} else {

renderPage(num);

}

function zoomIn() {

if (scale >= 3.0) return;

scale += 0.25;

zoomLevel.textContent = `${Math.round(scale * 100)}%`;

queueRenderPage(currentPage);

}

function zoomOut() {

if (scale <= 0.5) return;

scale -= 0.25;

zoomLevel.textContent = `${Math.round(scale * 100)}%`;

queueRenderPage(currentPage);

}

function setTool(tool) {

currentTool = tool;

// Update button states

redactBtn.style.backgroundColor = tool === 'redact' ? '#e6e6e6' : '';

textBtn.style.backgroundColor = tool === 'text' ? '#e6e6e6' : '';

highlightBtn.style.backgroundColor = tool === 'highlight' ? '#e6e6e6' : '';

deleteBtn.style.backgroundColor = tool === 'delete' ? '#e6e6e6' : '';

// Clear selection

if (selectedAnnotation) {

selectedAnnotation.element.classList.remove('selected');

selectedAnnotation = null;

}

function createAnnotation(type, x, y, width, height, color, text) {

const annotation = {

type: type,

x: x,

y: y,

width: width,

height: height,

color: color || '#000000',

text: text || '',

page: currentPage,

element: null

};

annotations.push(annotation);

drawAnnotation(annotation);

return annotation;

}

function drawAnnotation(annotation) {

// Remove existing element if it exists

if (annotation.element) {

pdfViewer.removeChild(annotation.element);

}

const element = document.createElement('div');

element.style.position = 'absolute';

element.style.left = `${annotation.x}px`;

element.style.top = `${annotation.y}px`;

switch (annotation.type) {

case 'redact':

element.className = 'redaction-rect';

element.style.width = `${annotation.width}px`;

element.style.height = `${annotation.height}px`;

element.style.backgroundColor = annotation.color;

break;

case 'text':

element.className = 'text-annotation';

element.textContent = annotation.text;

element.style.color = annotation.color;

element.style.fontSize = '16px';

element.style.width = 'auto';

element.style.height = 'auto';

break;

case 'highlight':

element.className = 'highlight-annotation';

element.style.width = `${annotation.width}px`;

element.style.height = `${annotation.height}px`;

element.style.backgroundColor = annotation.color;

break;

}

element.addEventListener('mousedown', (e) => handleAnnotationMouseDown(e, annotation));

pdfViewer.appendChild(element);

annotation.element = element;

}

function drawAnnotations() {

// Clear existing annotations

annotations.forEach(ann => {

if (ann.element) {

pdfViewer.removeChild(ann.element);

ann.element = null;

}

});

// Draw annotations for current page

annotations.filter(ann => ann.page === currentPage).forEach(drawAnnotation);

}

function handleAnnotationMouseDown(e, annotation) {

e.stopPropagation();

if (currentTool === 'delete') {

// Remove the annotation

const index = annotations.indexOf(annotation);

if (index !== -1) {

annotations.splice(index, 1);

pdfViewer.removeChild(annotation.element);

}

return;

}

// Select the annotation

if (selectedAnnotation) {

selectedAnnotation.element.classList.remove('selected');

}

selectedAnnotation = annotation;

annotation.element.classList.add('selected');

// Prepare for dragging

isDragging = true;

dragOffsetX = e.clientX - annotation.x;

dragOffsetY = e.clientY - annotation.y;

document.addEventListener('mousemove', handleAnnotationDrag);

document.addEventListener('mouseup', handleAnnotationDragEnd);

}

function handleAnnotationDrag(e) {

if (!isDragging || !selectedAnnotation) return;

selectedAnnotation.x = e.clientX - dragOffsetX;

selectedAnnotation.y = e.clientY - dragOffsetY;

selectedAnnotation.element.style.left = `${selectedAnnotation.x}px`;

selectedAnnotation.element.style.top = `${selectedAnnotation.y}px`;

}

function handleAnnotationDragEnd() {

isDragging = false;

document.removeEventListener('mousemove', handleAnnotationDrag);

document.removeEventListener('mouseup', handleAnnotationDragEnd);

}

// Handle canvas mouse events for creating annotations

canvas.addEventListener('mousedown', handleCanvasMouseDown);

function handleCanvasMouseDown(e) {

if (!currentTool || currentTool === 'delete') return;

const rect = canvas.getBoundingClientRect();

const startX = e.clientX - rect.left;

const startY = e.clientY - rect.top;

let annotation = null;

if (currentTool === 'text') {

const text = prompt('Enter text:');

if (text) {

annotation = createAnnotation('text', startX, startY, 0, 0, colorPicker.value, text);

}

return;

}

function handleMouseMove(e) {

const x = e.clientX - rect.left;

const y = e.clientY - rect.top;

const width = x - startX;

const height = y - startY;

if (!annotation) {

// Create new annotation

annotation = createAnnotation(currentTool, startX, startY, width, height, colorPicker.value);

} else {

// Update existing annotation

annotation.width = width;

annotation.height = height;

// For redactions and highlights, adjust position if dragging left/up

if (width < 0) {

annotation.x = x;

annotation.width = -width;

}

if (height < 0) {

annotation.y = y;

annotation.height = -height;

}

drawAnnotation(annotation);

}

function handleMouseUp() {

document.removeEventListener('mousemove', handleMouseMove);

document.removeEventListener('mouseup', handleMouseUp);

}

document.addEventListener('mousemove', handleMouseMove);

document.addEventListener('mouseup', handleMouseUp);

}

function downloadRedactedPdf() {

if (!pdfDoc) return;

loadingOverlay.style.display = 'flex';

// In a real implementation, you would use a PDF library to apply the redactions

// For this demo, we'll just simulate the process

setTimeout(() => {

loadingOverlay.style.display = 'none';

// Create a fake download (in a real app, you would generate the actual redacted PDF)

const link = document.createElement('a');

link.href = URL.createObjectURL(new Blob(['Simulated redacted PDF content'], { type: 'application/pdf' }));

link.download = 'redacted-document.pdf';

link.click();

}, 2000);

}

});

</script>

```

## Features Implemented

1. **File Upload**: Drag & drop or file selection for PDFs

2. **PDF Viewer**: Displays PDF pages with zoom controls

3. **Redaction Tools**:

- Blackout redaction rectangles

- Text annotations

- Highlight areas

- Delete elements

4. **Color Picker**: For annotation colors

5. **Page Navigation**: Shows current page and total pages

6. **Download Functionality**: Simulated redacted PDF download

## Limitations

This is a frontend-only implementation that simulates the redaction process. In a production environment, you would need:

1. A backend service to actually process and redact the PDF

2. Integration with a PDF library that can apply the redactions permanently

3. More robust error handling and security measures

The code uses PDF.js for rendering PDFs in the browser, which is the same library used by many online PDF tools.

You can paste this entire code block into your Blogger HTML/JavaScript gadget, and it should work as a basic PDF redaction interface.

blogzscript.site

PDF Redaction Tool for Blogger

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PDF Redaction Tool for Blogger

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