Merge pull request #2695 from yurydelendik/copy-protection-2

Fixes text search for "secured" documents (take 2)

src/api.js

@@ -298,7 +298,7 @@ var PDFPageProxy = (function PDFPageProxyClosure() {
           }
 
           var gfx = new CanvasGraphics(params.canvasContext, this.commonObjs,
-            this.objs, !this.pageInfo.disableTextLayer && params.textLayer);
+            this.objs, params.textLayer);
           try {
             this.display(gfx, params.viewport, complete, continueCallback);
           } catch (e) {

src/core.js

@@ -538,8 +538,10 @@ var PDFDocument = (function PDFDocumentClosure() {
       return shadow(this, 'numPages', num);
     },
     getDocumentInfo: function PDFDocument_getDocumentInfo() {
+      var encrypt = this.xref.encrypt;
       var docInfo = {
         PDFFormatVersion: this.pdfFormatVersion,
+        IsTextCopyDisabled: encrypt ? encrypt.disableTextCopy : false,
         IsAcroFormPresent: !!this.acroForm
       };
       if (this.xref.trailer.has('Info')) {

src/crypto.js

@@ -561,7 +561,7 @@ var CipherTransformFactory = (function CipherTransformFactoryClosure() {
     var ownerPassword = stringToBytes(dict.get('O'));
     var userPassword = stringToBytes(dict.get('U'));
     var flags = dict.get('P');
-    this.disableTextLayer = !(flags & 16);
+    this.disableTextCopy = !(flags & 16);
     var revision = dict.get('R');
     var encryptMetadata = algorithm == 4 &&  // meaningful when V is 4
       dict.get('EncryptMetadata') !== false; // makes true as default value

src/worker.js

@@ -214,13 +214,11 @@ var WorkerMessageHandler = {
     handler.on('GetPageRequest', function wphSetupGetPage(data) {
       var pageNumber = data.pageIndex + 1;
       var pdfPage = pdfModel.getPage(pageNumber);
-      var encrypt = pdfModel.xref.encrypt;
       var page = {
         pageIndex: data.pageIndex,
         rotate: pdfPage.rotate,
         ref: pdfPage.ref,
-        view: pdfPage.view,
+        view: pdfPage.view
-        disableTextLayer: encrypt ? encrypt.disableTextLayer : false
       };
       handler.send('GetPage', {pageInfo: page});
     });

web/viewer.css

@@ -1198,6 +1198,14 @@ canvas {
   background-color: rgba(0, 100, 0, 0.2);
 }
 
+#viewerContainer.copy-protection .textLayer > div {
+  visibility: hidden;
+}
+
+#viewerContainer.copy-protection .textLayer > div > .highlight {
+  visibility: visible;
+}
+
 /* TODO: file FF bug to support ::-moz-selection:window-inactive
    so we can override the opaque grey background when the window is inactive;
    see https://bugzilla.mozilla.org/show_bug.cgi?id=706209 */

web/viewer.js

@@ -1352,6 +1352,14 @@ var PDFView = {
         // AcroForm/XFA was found
         PDFView.fallback();
       }
+
+      if (info.IsTextCopyDisabled) {
+        document.getElementById('viewerContainer').classList
+          .add('copy-protection');
+      } else {
+        document.getElementById('viewerContainer').classList
+          .remove('copy-protection');
+      }
     });
   },