Merge pull request #6599 from nextcloud/fix_2523

Add direct preview link

apps/files_sharing/lib/Controller/PublicPreviewController.php

@@ -101,4 +101,51 @@ class PublicPreviewController extends Controller {
 			return new DataResponse([], Http::STATUS_BAD_REQUEST);
 		}
 	}
+
+	/**
+	 * @PublicPage
+	 * @NoCSRFRequired
+	 * @NoSameSiteCookieRequired
+	 *
+	 * @param $token
+	 * @return DataResponse|FileDisplayResponse
+	 */
+	public function directLink($token) {
+		// No token no image
+		if ($token === '') {
+			return new DataResponse([], Http::STATUS_BAD_REQUEST);
+		}
+
+		// No share no image
+		try {
+			$share = $this->shareManager->getShareByToken($token);
+		} catch (ShareNotFound $e) {
+			return new DataResponse([], Http::STATUS_NOT_FOUND);
+		}
+
+		// No permissions no image
+		if (($share->getPermissions() & Constants::PERMISSION_READ) === 0) {
+			return new DataResponse([], Http::STATUS_FORBIDDEN);
+		}
+
+		// Password protected shares have no direct link!
+		if ($share->getPassword() !== null) {
+			return new DataResponse([], Http::STATUS_FORBIDDEN);
+		}
+
+		try {
+			$node = $share->getNode();
+			if ($node instanceof Folder) {
+				// Direct link only works for single files
+				return new DataResponse([], Http::STATUS_BAD_REQUEST);
+			}
+
+			$f = $this->previewManager->getPreview($node, -1, -1, false);
+			return new FileDisplayResponse($f, Http::STATUS_OK, ['Content-Type' => $f->getMimeType()]);
+		} catch (NotFoundException $e) {
+			return new DataResponse([], Http::STATUS_NOT_FOUND);
+		} catch (\InvalidArgumentException $e) {
+			return new DataResponse([], Http::STATUS_BAD_REQUEST);
+		}
+	}
 }

apps/files_sharing/lib/Controller/ShareController.php

@@ -372,9 +372,14 @@ class ShareController extends Controller {
 		$shareTmpl['previewMaxX'] = $this->config->getSystemValue('preview_max_x', 1024);
 		$shareTmpl['previewMaxY'] = $this->config->getSystemValue('preview_max_y', 1024);
 		$shareTmpl['disclaimer'] = $this->config->getAppValue('core', 'shareapi_public_link_disclaimertext', null);
+		$shareTmpl['previewURL'] = $shareTmpl['downloadURL'];
 		if ($shareTmpl['previewSupported']) {
 			$shareTmpl['previewImage'] = $this->urlGenerator->linkToRouteAbsolute( 'files_sharing.PublicPreview.getPreview',
 				['x' => 200, 'y' => 200, 'file' => $shareTmpl['directory_path'], 't' => $shareTmpl['dirToken']]);
+			// We just have direct previews for image files
+			if ($share->getNode()->getMimePart() === 'image') {
+				$shareTmpl['previewURL'] = $this->urlGenerator->linkToRouteAbsolute('files_sharing.publicpreview.directLink', ['token' => $token]);
+			}
 		} else {
 			$shareTmpl['previewImage'] = $this->urlGenerator->getAbsoluteURL($this->urlGenerator->imagePath('core', 'favicon-fb.png'));
 		}

apps/files_sharing/templates/public.php

@@ -92,7 +92,7 @@ $maxUploadFilesize = min($upload_max_filesize, $post_max_size);
 				</div>
 				<div class="directLink">
 					<label for="directLink"><?php p($l->t('Direct link')) ?></label>
-					<input id="directLink" type="text" readonly value="<?php p($_['downloadURL']); ?>">
+					<input id="directLink" type="text" readonly value="<?php p($_['previewURL']); ?>">
 				</div>
 			<?php endif; ?>
 		</div>

apps/files_sharing/tests/Controller/ShareControllerTest.php

@@ -396,7 +396,8 @@ class ShareControllerTest extends \Test\TestCase {
 			'shareOwner' => 'ownerDisplay',
 			'disclaimer' => 'My disclaimer text',
 			'shareUrl' => null,
-			'previewImage' => null
+			'previewImage' => null,
+			'previewURL' => null,
 		);
 
 		$csp = new \OCP\AppFramework\Http\ContentSecurityPolicy();

core/routes.php

@@ -135,6 +135,14 @@ $this->create('files_sharing.sharecontroller.downloadShare', '/s/{token}/downloa
 		throw new \OC\HintException('App file sharing is not enabled');
 	}
 });
+$this->create('files_sharing.publicpreview.directLink', '/s/{token}/preview')->get()->action(function($urlParams) {
+	if (class_exists(\OCA\Files_Sharing\AppInfo\Application::class, false)) {
+		$app = new \OCA\Files_Sharing\AppInfo\Application($urlParams);
+		$app->dispatch('PublicPreviewController', 'directLink');
+	} else {
+		throw new \OC\HintException('App file sharing is not enabled');
+	}
+});
 
 // used for heartbeat
 $this->create('heartbeat', '/heartbeat')->action(function(){

lib/private/Preview/Generator.php

@@ -110,6 +110,12 @@ class Generator {
 		$maxPreview = $this->getMaxPreview($previewFolder, $file, $mimeType);
 		list($maxWidth, $maxHeight) = $this->getPreviewSize($maxPreview);
 
+		// If both width and heigth are -1 we just want the max preview
+		if ($width === -1 && $height === -1) {
+			$width = $maxWidth;
+			$height = $maxHeight;
+		}
+
 		// Calculate the preview size
 		list($width, $height) = $this->calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight);