Use SVG previews for public sharing

Fixes https://github.com/owncloud/core/pull/11367#issuecomment-57306037 and https://github.com/owncloud/core/issues/9218

apps/files_sharing/js/public.js

@@ -56,6 +56,11 @@ OCA.Sharing.PublicApp = {
 		}
 
 		var mimetype = $('#mimetype').val();
+		var mimetypeIcon = $('#mimetypeIcon').val();
+		mimetypeIcon = mimetypeIcon.substring(0, mimetypeIcon.length - 3);
+		mimetypeIcon = mimetypeIcon + 'svg';
+
+		var previewSupported = $('#previewSupported').val();
 
 		if (typeof FileActions !== 'undefined') {
 			// Show file preview if previewer is available, images are already handled by the template
@@ -68,21 +73,25 @@ OCA.Sharing.PublicApp = {
 			}
 		}
 
+
 		// dynamically load image previews
-		if (mimetype.substr(0, mimetype.indexOf('/')) === 'image') {
-
-			var params = {
-				x: $(document).width() * window.devicePixelRatio,
-				y: $(document).height() * window.devicePixelRatio,
-				a: 'true',
-				file: encodeURIComponent(this.initialDir + $('#filename').val()),
-				t: $('#sharingToken').val(),
-				scalingup: 0
-			};
+		var params = {
+			x: $(document).width() * window.devicePixelRatio,
+			y: $(document).height() * window.devicePixelRatio,
+			a: 'true',
+			file: encodeURIComponent(this.initialDir + $('#filename').val()),
+			t: $('#sharingToken').val(),
+			scalingup: 0
+		};
 
-			var img = $('<img class="publicpreview">');
+		var img = $('<img class="publicpreview">');
+		if (previewSupported === 'true' || mimetype.substr(0, mimetype.indexOf('/')) === 'image') {
 			img.attr('src', OC.filePath('files_sharing', 'ajax', 'publicpreview.php') + '?' + OC.buildQueryString(params));
 			img.appendTo('#imgframe');
+		} else if (mimetype.substr(0, mimetype.indexOf('/')) !== 'video') {
+			img.attr('src', OC.Util.replaceSVGIcon(mimetypeIcon));
+			img.attr('width', 128);
+			img.appendTo('#imgframe');
 		}
 
 		if (this.fileList) {

apps/files_sharing/templates/public.php

@@ -1,5 +1,8 @@
 <?php /** @var $l OC_L10N */ ?>
-<?php $thumbSize=1024; ?>
+<?php
+$thumbSize=1024;
+$previewSupported = OC\Preview::isMimeSupported($_['mimetype']) ? 'true' : 'false';
+?>
 <?php if ( \OC\Preview::isMimeSupported($_['mimetype'])): /* This enables preview images for links (e.g. on Facebook, Google+, ...)*/?>
 	<link rel="image_src" href="<?php p(OCP\Util::linkToRoute( 'core_ajax_public_preview', array('x' => $thumbSize, 'y' => $thumbSize, 'file' => $_['directory_path'], 't' => $_['dirToken']))); ?>" />
 <?php endif; ?>
@@ -15,6 +18,10 @@
 <input type="hidden" name="sharingToken" value="<?php p($_['sharingToken']) ?>" id="sharingToken">
 <input type="hidden" name="filename" value="<?php p($_['filename']) ?>" id="filename">
 <input type="hidden" name="mimetype" value="<?php p($_['mimetype']) ?>" id="mimetype">
+<input type="hidden" name="previewSupported" value="<?php p($previewSupported); ?>" id="previewSupported">
+<input type="hidden" name="mimetypeIcon" value="<?php p(OC_Helper::mimetypeIcon($_['mimetype'])); ?>" id="mimetypeIcon">
+
+
 <header><div id="header" class="<?php p((isset($_['folder']) ? 'share-folder' : 'share-file')) ?>">
 		<a href="<?php print_unescaped(link_to('', 'index.php')); ?>"
 			title="" id="owncloud">
@@ -47,23 +54,15 @@
 		<?php if (isset($_['folder'])): ?>
 			<?php print_unescaped($_['folder']); ?>
 		<?php else: ?>
-			<?php if (substr($_['mimetype'], 0, strpos($_['mimetype'], '/')) == 'image'): ?>
-				<div id="imgframe">
-				</div>
-			<?php elseif (substr($_['mimetype'], 0, strpos($_['mimetype'], '/')) == 'video'): ?>
+			<?php if (substr($_['mimetype'], 0, strpos($_['mimetype'], '/')) == 'video'): ?>
 				<div id="imgframe">
 					<video tabindex="0" controls="" preload="none">
 						<source src="<?php p($_['downloadURL']); ?>" type="<?php p($_['mimetype']); ?>" />
 					</video>
 				</div>
 			<?php else: ?>
-				<div id="imgframe">
-					<?php $size = \OC\Preview::isMimeSupported($_['mimetype']) ? 500 : 128 ?>
-					<img
-						src="<?php p(OCP\Util::linkToRoute( 'core_ajax_public_preview', array('x' => $size, 'y' => $size, 'file' => $_['directory_path'], 't' => $_['dirToken']))); ?>"
-						class="publicpreview"
-						alt="" />
-				</div>
+				<!-- Preview frame is filled via JS to support SVG images for modern browsers -->
+				<div id="imgframe"></div>
 			<?php endif; ?>
 			<div class="directDownload">
 				<a href="<?php p($_['downloadURL']); ?>" id="download" class="button">