share->getPassword(); } public function isValidToken(): bool { try { $this->share = $this->shareManager->getShareByToken($this->getToken()); return true; } catch (ShareNotFound $e) { return false; } } protected function isPasswordProtected(): bool { return $this->share->getPassword() !== null; } /** * Get a preview for a shared file * * @param string $token Token of the share * @param string $file File in the share * @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|DataResponse, array{}> * * 200: Preview returned * 400: Getting preview is not possible * 403: Getting preview is not allowed * 404: Share or preview not found */ #[PublicPage] #[NoCSRFRequired] public function getPreview( string $token, string $file = '', int $x = 32, int $y = 32, $a = false, ) { $cacheForSeconds = 60 * 60 * 24; // 1 day if ($token === '' || $x === 0 || $y === 0) { return new DataResponse([], Http::STATUS_BAD_REQUEST); } try { $share = $this->shareManager->getShareByToken($token); } catch (ShareNotFound $e) { return new DataResponse([], Http::STATUS_NOT_FOUND); } if (($share->getPermissions() & Constants::PERMISSION_READ) === 0) { return new DataResponse([], Http::STATUS_FORBIDDEN); } $attributes = $share->getAttributes(); // Only explicitly set to false will forbid the download! $downloadForbidden = $attributes?->getAttribute('permissions', 'download') === false; // Is this header is set it means our UI is doing a preview for no-download shares // we check a header so we at least prevent people from using the link directly (obfuscation) $isPublicPreview = $this->request->getHeader('X-NC-Preview') === 'true'; if ($isPublicPreview && $downloadForbidden) { // Only cache for 15 minutes on public preview requests to quickly remove from cache $cacheForSeconds = 15 * 60; } elseif ($downloadForbidden) { // This is not a public share preview so we only allow a preview if download permissions are granted return new DataResponse([], Http::STATUS_FORBIDDEN); } try { $node = $share->getNode(); if ($node instanceof Folder) { $file = $node->get($file); } else { $file = $node; } $f = $this->previewManager->getPreview($file, $x, $y, !$a); $response = new FileDisplayResponse($f, Http::STATUS_OK, ['Content-Type' => $f->getMimeType()]); $response->cacheFor($cacheForSeconds); return $response; } catch (NotFoundException $e) { return new DataResponse([], Http::STATUS_NOT_FOUND); } catch (\InvalidArgumentException $e) { return new DataResponse([], Http::STATUS_BAD_REQUEST); } } /** * @NoSameSiteCookieRequired * * Get a direct link preview for a shared file * * @param string $token Token of the share * @return FileDisplayResponse|DataResponse, array{}> * * 200: Preview returned * 400: Getting preview is not possible * 403: Getting preview is not allowed * 404: Share or preview not found */ #[PublicPage] #[NoCSRFRequired] public function directLink(string $token) { // No token no image if ($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); } $attributes = $share->getAttributes(); if ($attributes !== null && $attributes->getAttribute('permissions', 'download') === false) { 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); $response = new FileDisplayResponse($f, Http::STATUS_OK, ['Content-Type' => $f->getMimeType()]); $response->cacheFor(3600 * 24); return $response; } catch (NotFoundException $e) { return new DataResponse([], Http::STATUS_NOT_FOUND); } catch (\InvalidArgumentException $e) { return new DataResponse([], Http::STATUS_BAD_REQUEST); } } }