[stable18] Prevent download, printing and text selection when download is hidden

css/viewer.css

@@ -21,3 +21,24 @@ html .doorHangerRight:after {
 html .doorHangerRight:before {
   right: 53px!important;
 }
+
+/* Prevent printing from the browser when the download of a share is hidden. */
+@media print {
+	.pdfViewer.disabledTextSelection {
+		visibility: hidden;
+		display: none;
+	}
+}
+
+/* Prevent text selection when the download of a share is hidden. */
+.pdfViewer.disabledTextSelection .textLayer {
+	user-select: none;
+	-moz-user-select: none;
+	-webkit-user-select: none;
+	-ms-user-select: none;
+}
+
+/* Override text cursor in descendants. */
+.pdfViewer.disabledTextSelection .textLayer * {
+	cursor: default;
+}

js/previewplugin.js

@@ -81,10 +81,6 @@ var isSecureViewerAvailable = function () {
 			// if a filelist is present, the PDF viewer can be closed to go back there
 			$('#pdframe').load(function(){
 				var iframe = $('#pdframe').contents();
-				if ($('#hideDownload').val() === 'true') {
-					iframe.find('.toolbarButton.download').hide()
-					iframe.find('.toolbarButton.print').hide()
-				}
 				if ($('#fileList').length)
 				{
 					iframe.find('#secondaryToolbarClose').click(function() {
@@ -105,6 +101,7 @@ var isSecureViewerAvailable = function () {
 				var hideDownload = $('#hideDownload').val();
 				if (hideDownload === 'true') {
 					iframe.find('.download').addClass('hidden');
+					iframe.find('.pdfViewer').addClass('disabledTextSelection')
 				}
 			});
 

js/workersrc.js

@@ -70,6 +70,31 @@ function initializeCustomPDFViewerApplication() {
 
 		this.downloadManager.downloadUrl(url, getPDFFileNameFromURL(url));
 	};
+
+	var hideDownload = window.parent.document.getElementById('hideDownload').value === 'true';
+	if (hideDownload) {
+		// Disable download function when downloads are hidden, as even if the
+		// buttons in the UI are hidden the download could still be triggered
+		// with Ctrl|Meta+S.
+		PDFViewerApplication.download = function() {
+		}
+
+		// Disable printing service when downloads are hidden, as even if the
+		// buttons in the UI are hidden the printing could still be triggered
+		// with Ctrl|Meta+P.
+		// Abuse the "supportsPrinting" parameter, which signals that the
+		// browser does not fully support printing, to make PDFViewer disable
+		// the printing service.
+		// "supportsPrinting" is a getter function, so it needs to be deleted
+		// before replacing it with a simple value.
+		delete PDFViewerApplication.supportsPrinting;
+		PDFViewerApplication.supportsPrinting = false;
+		// When printing is not supported a warning is shown by the default
+		// "beforePrint" function when trying to print. That function needs to
+		// be replaced with an empty one to prevent that warning to be shown.
+		PDFViewerApplication.beforePrint = function() {
+		}
+	}
 }
 
 document.addEventListener('webviewerloaded', initializeCustomPDFViewerApplication, true);