[stable30] fix(files_versions): Rely on server mime fallback icons

apps/files_versions/lib/Controller/PreviewController.php

@@ -12,11 +12,13 @@
 use OCP\AppFramework\Http\Attribute\NoCSRFRequired;
 use OCP\AppFramework\Http\DataResponse;
 use OCP\AppFramework\Http\FileDisplayResponse;
+use OCP\AppFramework\Http\RedirectResponse;
 use OCP\Files\IRootFolder;
 use OCP\Files\NotFoundException;
 use OCP\IPreview;
 use OCP\IRequest;
 use OCP\IUserSession;
+use OCP\Preview\IMimeIconProvider;
 
 class PreviewController extends Controller {
 
@@ -38,7 +40,8 @@ public function __construct(
 		IRootFolder $rootFolder,
 		IUserSession $userSession,
 		IVersionManager $versionManager,
-		IPreview $previewManager
+		IPreview $previewManager,
+		private IMimeIconProvider $mimeIconProvider,
 	) {
 		parent::__construct($appName, $request);
 
@@ -55,9 +58,11 @@ public function __construct(
 	 * @param int $x Width of the preview
 	 * @param int $y Height of the preview
 	 * @param string $version Version of the file to get the preview for
-	 * @return FileDisplayResponse<Http::STATUS_OK, array{Content-Type: string}>|DataResponse<Http::STATUS_BAD_REQUEST|Http::STATUS_NOT_FOUND, array<empty>, array{}>
+	 * @param bool $mimeFallback Whether to fallback to the mime icon if no preview is available
+	 * @return FileDisplayResponse<Http::STATUS_OK, array{Content-Type: string}>|DataResponse<Http::STATUS_BAD_REQUEST|Http::STATUS_NOT_FOUND, array<empty>, array{}>|RedirectResponse<Http::STATUS_SEE_OTHER, array{}>
 	 *
 	 * 200: Preview returned
+	 * 303: Redirect to the mime icon url if mimeFallback is true
 	 * 400: Getting preview is not possible
 	 * 404: Preview not found
 	 */
@@ -67,20 +72,32 @@ public function getPreview(
 		string $file = '',
 		int $x = 44,
 		int $y = 44,
-		string $version = ''
+		string $version = '',
+		bool $mimeFallback = false,
 	) {
 		if ($file === '' || $version === '' || $x === 0 || $y === 0) {
 			return new DataResponse([], Http::STATUS_BAD_REQUEST);
 		}
 
+		$versionFile = null;
 		try {
 			$user = $this->userSession->getUser();
 			$userFolder = $this->rootFolder->getUserFolder($user->getUID());
 			$file = $userFolder->get($file);
 			$versionFile = $this->versionManager->getVersionFile($user, $file, $version);
 			$preview = $this->previewManager->getPreview($versionFile, $x, $y, true, IPreview::MODE_FILL, $versionFile->getMimetype());
-			return new FileDisplayResponse($preview, Http::STATUS_OK, ['Content-Type' => $preview->getMimeType()]);
+			$response = new FileDisplayResponse($preview, Http::STATUS_OK, ['Content-Type' => $preview->getMimeType()]);
+			$response->cacheFor(3600 * 24, false, true);
+			return $response;
 		} catch (NotFoundException $e) {
+			// If we have no preview enabled, we can redirect to the mime icon if any
+			if ($mimeFallback && $versionFile !== null) {
+				$url = $this->mimeIconProvider->getMimeIconUrl($versionFile->getMimeType());
+				if ($url !== null) {
+					return new RedirectResponse($url);
+				}
+			}
+
 			return new DataResponse([], Http::STATUS_NOT_FOUND);
 		} catch (\InvalidArgumentException $e) {
 			return new DataResponse([], Http::STATUS_BAD_REQUEST);

apps/files_versions/openapi.json

@@ -103,6 +103,19 @@
                             "type": "string",
                             "default": ""
                         }
+                    },
+                    {
+                        "name": "mimeFallback",
+                        "in": "query",
+                        "description": "Whether to fallback to the mime icon if no preview is available",
+                        "schema": {
+                            "type": "integer",
+                            "default": 0,
+                            "enum": [
+                                0,
+                                1
+                            ]
+                        }
                     }
                 ],
                 "responses": {
@@ -132,6 +145,16 @@
                                 "schema": {}
                             }
                         }
+                    },
+                    "303": {
+                        "description": "Redirect to the mime icon url if mimeFallback is true",
+                        "headers": {
+                            "Location": {
+                                "schema": {
+                                    "type": "string"
+                                }
+                            }
+                        }
                     }
                 }
             }

apps/files_versions/src/components/Version.vue

@@ -10,7 +10,7 @@
 		<!-- Icon -->
 		<template #icon>
 			<div v-if="!(loadPreview || previewLoaded)" class="version__image" />
-			<img v-else-if="(isCurrent || version.hasPreview) && !previewErrored"
+			<img v-else-if="version.previewUrl && !previewErrored"
 				:src="version.previewUrl"
 				alt=""
 				decoding="async"

apps/files_versions/src/utils/versions.ts

@@ -28,7 +28,6 @@ export interface Version {
 	type: string, // 'file'
 	mtime: number, // Version creation date as a timestamp
 	permissions: string, // Only readable: 'R'
-	hasPreview: boolean, // Whether the version has a preview
 	previewUrl: string, // Preview URL of the version
 	url: string, // Download URL of the version
 	source: string, // The WebDAV endpoint of the ressource
@@ -78,12 +77,12 @@ function formatVersion(version: any, fileInfo: any): Version {
 	let previewUrl = ''
 
 	if (mtime === fileInfo.mtime) { // Version is the current one
-		previewUrl = generateUrl('/core/preview?fileId={fileId}&c={fileEtag}&x=250&y=250&forceIcon=0&a=0', {
+		previewUrl = generateUrl('/core/preview?fileId={fileId}&c={fileEtag}&x=250&y=250&forceIcon=0&a=0&forceIcon=1&mimeFallback=1', {
 			fileId: fileInfo.id,
 			fileEtag: fileInfo.etag,
 		})
 	} else {
-		previewUrl = generateUrl('/apps/files_versions/preview?file={file}&version={fileVersion}', {
+		previewUrl = generateUrl('/apps/files_versions/preview?file={file}&version={fileVersion}&mimeFallback=1', {
 			file: joinPaths(fileInfo.path, fileInfo.name),
 			fileVersion: version.basename,
 		})
@@ -102,7 +101,6 @@ function formatVersion(version: any, fileInfo: any): Version {
 		type: version.type,
 		mtime,
 		permissions: 'R',
-		hasPreview: version.props['has-preview'] === 1,
 		previewUrl,
 		url: joinPaths('/remote.php/dav', version.filename),
 		source: generateRemoteUrl('dav') + encodePath(version.filename),

apps/files_versions/src/views/VersionTab.vue

@@ -274,13 +274,12 @@ export default {
 				return
 			}
 
-			// Versions previews are too small for our use case, so we override hasPreview and previewUrl
+			// Versions previews are too small for our use case, so we override previewUrl
 			// which makes the viewer render the original file.
 			// We also point to the original filename if the version is the current one.
 			const versions = this.versions.map(version => ({
 				...version,
 				filename: version.mtime === this.fileInfo.mtime ? path.join('files', getCurrentUser()?.uid ?? '', this.fileInfo.path, this.fileInfo.name) : version.filename,
-				hasPreview: false,
 				previewUrl: undefined,
 			}))
 
@@ -291,7 +290,7 @@ export default {
 		},
 
 		compareVersion({ version }) {
-			const versions = this.versions.map(version => ({ ...version, hasPreview: false, previewUrl: undefined }))
+			const versions = this.versions.map(version => ({ ...version, previewUrl: undefined }))
 
 			OCA.Viewer.compare(this.viewerFileInfo, versions.find(v => v.source === version.source))
 		},

apps/files_versions/tests/Controller/PreviewControllerTest.php

@@ -3,13 +3,13 @@
  * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
+
 namespace OCA\Files_Versions\Tests\Controller;
 
 use OCA\Files_Versions\Controller\PreviewController;
 use OCA\Files_Versions\Versions\IVersionManager;
 use OCP\AppFramework\Http;
 use OCP\AppFramework\Http\DataResponse;
-use OCP\AppFramework\Http\FileDisplayResponse;
 use OCP\Files\File;
 use OCP\Files\Folder;
 use OCP\Files\IMimeTypeDetector;
@@ -20,6 +20,8 @@
 use OCP\IRequest;
 use OCP\IUser;
 use OCP\IUserSession;
+use OCP\Preview\IMimeIconProvider;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class PreviewControllerTest extends TestCase {
@@ -45,6 +47,8 @@ class PreviewControllerTest extends TestCase {
 	/** @var IVersionManager|\PHPUnit\Framework\MockObject\MockObject */
 	private $versionManager;
 
+	private IMimeIconProvider&MockObject $mimeIconProvider;
+
 	protected function setUp(): void {
 		parent::setUp();
 
@@ -60,14 +64,16 @@ protected function setUp(): void {
 			->method('getUser')
 			->willReturn($user);
 		$this->versionManager = $this->createMock(IVersionManager::class);
+		$this->mimeIconProvider = $this->createMock(IMimeIconProvider::class);
 
 		$this->controller = new PreviewController(
 			'files_versions',
 			$this->createMock(IRequest::class),
 			$this->rootFolder,
 			$this->userSession,
 			$this->versionManager,
-			$this->previewManager
+			$this->previewManager,
+			$this->mimeIconProvider,
 		);
 	}
 
@@ -131,9 +137,10 @@ public function testValidPreview() {
 			->willReturn('previewMime');
 
 		$res = $this->controller->getPreview('file', 10, 10, '42');
-		$expected = new FileDisplayResponse($preview, Http::STATUS_OK, ['Content-Type' => 'previewMime']);
 
-		$this->assertEquals($expected, $res);
+		$this->assertEquals('previewMime', $res->getHeaders()['Content-Type']);
+		$this->assertEquals(Http::STATUS_OK, $res->getStatus());
+		$this->assertEquals($preview, $this->invokePrivate($res, 'file'));
 	}
 
 	public function testVersionNotFound() {