Merge pull request #53715 from nextcloud/backport/52792/stable31

Author: skjnldsv

apps/files_sharing/lib/Controller/PublicPreviewController.php

@@ -11,13 +11,15 @@
 use OCP\AppFramework\Http\Attribute\PublicPage;
 use OCP\AppFramework\Http\DataResponse;
 use OCP\AppFramework\Http\FileDisplayResponse;
+use OCP\AppFramework\Http\RedirectResponse;
 use OCP\AppFramework\PublicShareController;
 use OCP\Constants;
 use OCP\Files\Folder;
 use OCP\Files\NotFoundException;
 use OCP\IPreview;
 use OCP\IRequest;
 use OCP\ISession;
+use OCP\Preview\IMimeIconProvider;
 use OCP\Share\Exceptions\ShareNotFound;
 use OCP\Share\IManager as ShareManager;
 use OCP\Share\IShare;
@@ -33,6 +35,7 @@ public function __construct(
 		private ShareManager $shareManager,
 		ISession $session,
 		private IPreview $previewManager,
+		private IMimeIconProvider $mimeIconProvider,
 	) {
 		parent::__construct($appName, $request, $session);
 	}
@@ -63,9 +66,11 @@ protected function isPasswordProtected(): bool {
 	 * @param int $x Width of the preview
 	 * @param int $y Height of the preview
 	 * @param bool $a Whether to not crop the preview
-	 * @return FileDisplayResponse<Http::STATUS_OK, array{Content-Type: string}>|DataResponse<Http::STATUS_BAD_REQUEST|Http::STATUS_FORBIDDEN|Http::STATUS_NOT_FOUND, list<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_FORBIDDEN|Http::STATUS_NOT_FOUND, list<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
 	 * 403: Getting preview is not allowed
 	 * 404: Share or preview not found
@@ -79,6 +84,7 @@ public function getPreview(
 		int $x = 32,
 		int $y = 32,
 		$a = false,
+		bool $mimeFallback = false,
 	) {
 		$cacheForSeconds = 60 * 60 * 24; // 1 day
 
@@ -124,6 +130,12 @@ public function getPreview(
 			$response->cacheFor($cacheForSeconds);
 			return $response;
 		} catch (NotFoundException $e) {
+			// If we have no preview enabled, we can redirect to the mime icon if any
+			if ($mimeFallback) {
+				if ($url = $this->mimeIconProvider->getMimeIconUrl($file->getMimeType())) {
+					return new RedirectResponse($url);
+				}
+			}
 			return new DataResponse([], Http::STATUS_NOT_FOUND);
 		} catch (\InvalidArgumentException $e) {
 			return new DataResponse([], Http::STATUS_BAD_REQUEST);

apps/files_sharing/openapi.json

@@ -1477,6 +1477,19 @@
                                 1
                             ]
                         }
+                    },
+                    {
+                        "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": {
@@ -1514,6 +1527,16 @@
                                 "schema": {}
                             }
                         }
+                    },
+                    "303": {
+                        "description": "Redirect to the mime icon url if mimeFallback is true",
+                        "headers": {
+                            "Location": {
+                                "schema": {
+                                    "type": "string"
+                                }
+                            }
+                        }
                     }
                 }
             }

apps/files_sharing/tests/Controller/PublicPreviewControllerTest.php

@@ -18,6 +18,7 @@
 use OCP\IPreview;
 use OCP\IRequest;
 use OCP\ISession;
+use OCP\Preview\IMimeIconProvider;
 use OCP\Share\Exceptions\ShareNotFound;
 use OCP\Share\IAttributes;
 use OCP\Share\IManager;
@@ -52,7 +53,8 @@ protected function setUp(): void {
 			$this->request,
 			$this->shareManager,
 			$this->createMock(ISession::class),
-			$this->previewManager
+			$this->previewManager,
+			$this->createMock(IMimeIconProvider::class),
 		);
 	}