PDFRedactorJS/index.html at main · mythsunwind/PDFRedactorJS · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
    <meta name="viewport" content="width=device-width, initial-scale = 1.0, maximum-scale = 1.0, user-scalable=no">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.1.266/pdf.min.js"></script>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-LN+7fdVzj6u52u30Kp6M/trliBMCMKTyK833zpbD+pXdCLuTusPj697FH4R/5mcr" crossorigin="anonymous">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.13.1/font/bootstrap-icons.min.css">
    <style type="text/css">

#pdf-main-container {
  margin: 20px auto;
}

#pdf-loader {
  text-align: center;
  color: #999999;
  font-size: 13px;
  line-height: 100px;
}

#pdf-contents {

}

#canvas-container{
  width: 100%;
  text-align: center;
  margin: auto;
}

canvas {
  border: 1px solid rgba(0, 0, 0, 0.2);
  box-sizing: border-box;
}

#page-loader {
  height: 100px;
  line-height: 100px;
  text-align: center;
  color: #999999;
  font-size: 13px;
}

.hidden {
  display: none;
}

.uploader {
  display: block;
  clear: both;
  margin: 0 auto;
  width: 100%;
  max-width: 600px;

  label {
    float: left;
    clear: both;
    width: 100%;
    padding: 2rem 1.5rem;
    text-align: center;
    background: #fff;
    border-radius: 7px;
    border: 3px solid #eee;
    transition: all .2s ease;
    user-select: none;
  }

  #messages {
    border-radius: 7px;
    background: #ced4da;
  }

  input[type="file"] {
    display: none;
  }
    </style>
</head>

<body>
<h2 style="text-align:center;">PDF Redactor JS</h2>

<div id="response" class="bg-light text-center my-3 hidden">
  <div class="row">
    <div class="col">
      <strong id="messages"></strong>
      <button type="button" class="btn btn-outline-primary" aria-label="Close" onclick="window.location.reload();"><i class="bi bi-x"></i></button>
    </div>
  </div>
</div>

<div id="upload-container" class="container text-center">
  <div class="row">
    <form id="file-upload-form" class="uploader">
      <input id="file-upload" type="file" name="fileUpload" accept="application/pdf" />

      <label for="file-upload" id="file-drag">
        <div id="start">
          <i class="fa fa-download" aria-hidden="true"></i>
          <div>Select a file or drag here</div>
          <span id="file-upload-btn" class="btn btn-primary">Select a file</span>
        </div>
      </label>
    </form>
  </div>
</div>

<div id="controls-container" class="container text-center hidden">
  <div class="row justify-content-md-center">
    <div class="col">
      <div class="btn-group" role="group">
        <button id="pdf-undo" class="btn btn-outline-primary" onclick="undoAction()"><i class="bi bi-arrow-counterclockwise"></i> Undo</button>
        <button id="pdf-redo" class="btn btn-outline-primary" ><i class="bi bi-arrow-clockwise"></i> Redo</button>
      </div>
    </div>
    <div class="col">
      <button id="pdf-prev" class="btn btn-dark"><i class="bi bi-arrow-left"></i></button>
    </div>
    <div class="col">
      <span id="page-count-container">Page <span id="pdf-current-page"></span> of <span id="pdf-total-pages"></span></span>
    </div>
    <div class="col">
      <button id="pdf-next" class="btn btn-dark"><i class="bi bi-arrow-right"></i></button>
    </div>
    <div class="col">
      <button id="download-image" class="btn btn-primary"><i class="bi bi-file-earmark-arrow-down"></i> Download PDF</button>
    </div>
  </div>
</div>

<div id="pdf-main-container">
    <div id="pdf-contents">

	<div id="pdf-loader">Loading document ...</div>
        <canvas id="pdf-canvas"></canvas>
	<div id="page-loader">Loading page ...</div>
    </div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.5.3/jspdf.debug.js"
        integrity="sha384-NaWTHo/8YCBYJ59830LTz/P4aQZK1sS0SneOgAvhsIl3zBu8r9RevNg5lHCHAuQ/"
        crossorigin="anonymous"></script>
<script>
  console.log("Upload Initialised");

  var fileSelect    = document.getElementById('file-upload'),
      fileDrag      = document.getElementById('file-drag'),
      submitButton  = document.getElementById('submit-button');

  fileSelect.addEventListener('change', fileSelectHandler, false);

  // Is XHR2 available?
  var xhr = new XMLHttpRequest();
  if (xhr.upload) {
    // File Drop
    fileDrag.addEventListener('dragover', fileDragHover, false);
    fileDrag.addEventListener('dragleave', fileDragHover, false);
    fileDrag.addEventListener('drop', fileSelectHandler, false);
  }

  function fileDragHover(e) {
    var fileDrag = document.getElementById('file-drag');

    e.stopPropagation();
    e.preventDefault();

    fileDrag.className = (e.type === 'dragover' ? 'hover' : 'modal-body file-upload');
  }

  function fileSelectHandler(e) {
    // Fetch FileList object
    var files = e.target.files || e.dataTransfer.files;

    // Cancel event and hover styling
    fileDragHover(e);

    // Process File object
    file = files[0]
    document.getElementById('messages').innerHTML = encodeURI(file.name);
    document.getElementById('response').classList.remove("hidden");
    document.getElementById('upload-container').classList.add("hidden");
    document.getElementById('controls-container').classList.remove("hidden");
    showPDF(URL.createObjectURL(file));
  }

  pdfjsLib.GlobalWorkerOptions.workerSrc = "https://cdn.jsdelivr.net/npm/pdfjs-dist@2.1.266/build/pdf.worker.min.js";

  var __PDF_DOC,
          __CURRENT_PAGE,
          __TOTAL_PAGES,
          __PAGE_RENDERING_IN_PROGRESS = 0,
          __CANVAS = $('#pdf-canvas').get(0),
          __CANVAS_CTX = __CANVAS.getContext('2d'),
          renderContext, allPages=[];
  const img = new Image;
  var buff = [], storedRects=[]; //so far we only deal with single page editor, if multipaged. we will need to update
  //to update the redo and undo structure, with multi buffs, or we just commit the change, and forget about re-editing

  // Upon click this should should trigger click on the #file-to-upload file input element
  function cleanCanvas(){
    __CANVAS_CTX.clearRect(0, 0, __CANVAS_CTX.canvas.width, __CANVAS_CTX.canvas.height);
    img.src = __CANVAS.toDataURL();
  }
  // Previous action on the PDF
  function undoAction(){
    if(storedRects.length>0){
      buff.push(storedRects.pop());
    }
  };

  function preloadAllPages() {
    allPages = [];
    for (let i = 1 ; i <= __TOTAL_PAGES; i++) {
      __PDF_DOC.getPage(i).then(function (page) {
        const width = window.screen.availWidth - 50;
        // As the canvas is of a fixed width we need to set the scale of the viewport accordingly
        const scale_required = width / page.getViewport(1).width;
        // Get viewport of the page at required scale //the scale is the % in the pdf file
        const viewport = page.getViewport(scale_required);
        const canv = document.createElement('canvas');
        const canv_con = canv.getContext('2d');
        // Set canvas width
        // Set canvas height
        canv.width = width;
        canv.height = viewport.height;

        const renderContext = {
          canvasContext: canv_con,
          viewport: viewport
        };
        // Render the page contents in the canvas
        page.render(renderContext).then(function () {
          allPages.push(canv);
        });
      });
    }
  }

  // Next action on the PDF
  $("#pdf-redo").on('click', function () {
    if(buff.length>0){
      storedRects.push(buff.pop());
    }
  });

  // Previous page of the PDF
  $("#pdf-prev").on('click', function () {
    if (__CURRENT_PAGE != 1){
      cleanCanvas();
      showPage(--__CURRENT_PAGE, true);
    }
  });

  // Next page of the PDF
  $("#pdf-next").on('click', function () {
    if (__CURRENT_PAGE != __TOTAL_PAGES){
      cleanCanvas();
      showPage(++__CURRENT_PAGE, true);
    }
  });
  // Download button
  $("#download-image").on('click', function () {
    let width = __CANVAS.width;
    let height = __CANVAS.height;

    //set the height and width for the output pdf file
    if(width > height){
      pdf = new jsPDF('l', 'px', [width, height]);
    }
    else{
      pdf = new jsPDF('p', 'px', [height, width]);
    }
    width = pdf.internal.pageSize.getWidth();
    height = pdf.internal.pageSize.getHeight();
    for (let i = 0; i < allPages.length; i++) {
      pdf.addImage(allPages[i], 'PNG', 0, 0, width, height);
      if (i < (allPages.length - 1)) {
        pdf.addPage();  // this adds a new page
      }
    }
    let filename = document.getElementById('messages').innerHTML.replace('.pdf', '-redacted.pdf')
    pdf.save(filename);
  });

  function showPDF(pdf_url) {
    pdfjsLib.getDocument(pdf_url).promise.then(function (pdf_doc) {
      __PDF_DOC = pdf_doc;
      __TOTAL_PAGES = __PDF_DOC.numPages;
      $("#pdf-total-pages").text(__TOTAL_PAGES);
      // Show the first page
      showPage(1, false);
      preloadAllPages();
    }).catch(function (error) {
      // If error re-show the upload button
      alert(error.message);
    });
  }

  function hideCanvas(){
    // Disable Prev & Next buttons while page is being loaded
    $("#pdf-next, #pdf-prev, #pdf-redo, #pdf-undo").attr('disabled', 'disabled');
    // While page is being rendered hide the canvas and show a loading message
    $("#pdf-canvas").hide();
    $("#pdf-loader").hide();
    $("#page-count-container").hide();
    $("#download-image").hide();
    $("#page-loader").hide();
  }
  function showCanvas() {
    // Re-enable Prev & Next buttons
    $('.pdf-buttons').show();
    $("#pdf-next, #pdf-prev, #pdf-redo, #pdf-undo").removeAttr('disabled');
    // Show the canvas and hide the page loader
    $("#pdf-canvas").show();
    $("#pdf-loader").hide();
    $("#page-count-container").show();
    $("#download-image").show();
    $("#page-loader").hide();
  }
  function showPage(page_no, prev) {
    storedRects=[];
    buff = [];
    __PAGE_RENDERING_IN_PROGRESS = 1;
    __CURRENT_PAGE = page_no;
    // Update current page in HTML
    $("#page-loader").show();
    $("#pdf-current-page").text(page_no);
    // Fetch the page
    __PDF_DOC.getPage(page_no).then(function (page) {
      const width = window.screen.availWidth-50;
      // As the canvas is of a fixed width we need to set the scale of the viewport accordingly
      var scale_required = width / page.getViewport(1).width;
      // Get viewport of the page at required scale //the scale is the % in the pdf file
      var viewport = page.getViewport(scale_required);

      // Set canvas width
      // Set canvas height
      __CANVAS.width = width;
      __CANVAS.height = viewport.height;

      renderContext = {
        canvasContext: __CANVAS_CTX,
        viewport: viewport
      };
      // Render the page contents in the canvas
      page.render(renderContext).then(function () {
        __PAGE_RENDERING_IN_PROGRESS = 0;
        if (prev) {
          img.src = allPages[page_no - 1].toDataURL();
        } else {
          img.src = __CANVAS.toDataURL();
        }
      })
    });
  }

  $(document).ready(function selection() {
    "use strict";
    hideCanvas();
    requestAnimationFrame(mainLoop);
    const canvas = document.getElementById("pdf-canvas");
    const ctx = canvas.getContext("2d");
    const baseImage = img;
    const rect = (() => {
      var x1, y1, x2, y2;
    var show = false;

    function fix() {
      rect.x = Math.min(x1, x2);
      rect.y = Math.min(y1, y2);
      rect.w = Math.max(x1, x2) - Math.min(x1, x2);
      rect.h = Math.max(y1, y2) - Math.min(y1, y2);
    }

    function draw(ctx) {
      ctx.fillRect(this.x, this.y, this.w, this.h);
    }

    const rect = {x: 0, y: 0, w: 0, h: 0, draw};
    const API = {
      restart(point) {
        x2 = x1 = point.x;
        y2 = y1 = point.y;
        fix();
        show = true;
      },
      update(point) {
        x2 = point.x;
        y2 = point.y;
        fix();
        show = true;
      },
      toRect() {
        show = false;
        return Object.assign({}, rect);
      },
      draw(ctx) {
        if (show) {
          rect.draw(ctx)
        }
      },
      show: false,
    }
    return API;
  })();

    const mouse = {
      button: false,
      x: 0,
      y: 0,
      down: false,
      up: false,
      element: null,
      event(e) {
        var rectCanv = canvas.getBoundingClientRect();
        const m = mouse;
        m.x = (e.clientX - rectCanv.left) / (rectCanv.right - rectCanv.left) * canvas.width;
        m.y = (e.clientY - rectCanv.top) / (rectCanv.bottom - rectCanv.top) * canvas.height;
        const prevButton = m.button;
        m.button = e.type === "mousedown" ? true : e.type === "mouseup" ? false : mouse.button;
        if (!prevButton && m.button) {
          m.down = true;
        }
        if (prevButton && !m.button) {
          m.up = true;
        }
      },
      start(element) {
        mouse.element = element;
        "down,up,move".split(",").forEach(name => document.addEventListener("mouse" + name, mouse.event));
      }
    }

    mouse.start(canvas);

    function draw() {
      ctx.drawImage(baseImage, 0, 0, ctx.canvas.width, ctx.canvas.height);
      ctx.lineWidth = 1;
      ctx.strokeStyle = "black";
      storedRects.forEach(rect => rect.draw(ctx));
      ctx.strokeStyle = "red";
      rect.draw(ctx);
    }
    function mainLoop() {
      var refresh = true;
      if(__TOTAL_PAGES == allPages.length)
	showCanvas();
      if (refresh || mouse.down || mouse.up || mouse.button) {
        refresh = false;
        if (mouse.down) {
          mouse.down = false;
          rect.restart(mouse);
        } else if (mouse.button) {
          rect.update(mouse);
        } else if (mouse.up) {
          mouse.up = false;
          rect.update(mouse);
          let tempRect = rect.toRect();
          const m = mouse;
          if(isFinite(tempRect.x) && isFinite(tempRect.y) && isFinite(tempRect.w) && isFinite(tempRect.h)
                  && tempRect.w!=0 && tempRect.h != 0
                  && m.x >0 && m.x<__CANVAS.width && m.y>0 && m.y<__CANVAS.height) {//only if the mouse land in the canvas,ok
            storedRects.push(tempRect);
            buff = [] //once the editor start to edit, the editor commits to the change so far, so redo is emptied out
	      const canv = document.createElement('canvas');
	      const canv_con = canv.getContext('2d');
	      canv.width = __CANVAS_CTX.canvas.width;
	      canv.height = __CANVAS_CTX.canvas.height;
	      canv_con.drawImage(__CANVAS, 0, 0, __CANVAS_CTX.canvas.width, __CANVAS_CTX.canvas.height);
	      allPages[__CURRENT_PAGE - 1] = canv;
          }
        }
        draw();
      }
      requestAnimationFrame(mainLoop)
    }
  })

</script>

</body>
</html>