use mimeIcon is preview not available

Signed-off-by: Maxence Lange <maxence@artificial-owl.com>

.gitignore

@@ -2,4 +2,4 @@
 /build
 /node_modules
 /vendor/
-
+.idea/

lib/Dashboard/RecommendationWidget.php

@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * @copyright Copyright (c) 2020 Julius Härtl <jus@bitgrid.net>
  *
@@ -30,6 +33,7 @@
 use OCP\Dashboard\IIconWidget;
 use OCP\Dashboard\IWidget;
 use OCP\Dashboard\Model\WidgetItem;
+use OCP\Files\IMimeTypeDetector;
 use OCP\IL10N;
 use OCP\IURLGenerator;
 use OCP\IUserManager;
@@ -40,19 +44,22 @@ class RecommendationWidget implements IWidget, IIconWidget, IAPIWidget {
 	private IUserSession $userSession;
 	private IL10N $l10n;
 	private IURLGenerator $urlGenerator;
+	private IMimeTypeDetector $mimeTypeDetector;
 	private RecommendationService $recommendationService;
 	private IUserManager $userManager;
 
 	public function __construct(
 		IUserSession $userSession,
 		IL10N $l10n,
 		IURLGenerator $urlGenerator,
+		IMimeTypeDetector $mimeTypeDetector,
 		RecommendationService $recommendationService,
 		IUserManager $userManager
 	) {
 		$this->userSession = $userSession;
 		$this->l10n = $l10n;
 		$this->urlGenerator = $urlGenerator;
+		$this->mimeTypeDetector = $mimeTypeDetector;
 		$this->recommendationService = $recommendationService;
 		$this->userManager = $userManager;
 	}
@@ -96,15 +103,31 @@ public function getItems(string $userId, ?string $since = null, int $limit = 7):
 		}
 		$recommendations = $this->recommendationService->getRecommendations($user, $limit);
 
-		return array_map(function(IRecommendation $recommendation) {
-			$url = $this->urlGenerator->linkToRouteAbsolute('files.viewcontroller.showFile', ['fileid' => $recommendation->getNode()->getId()]);
-			$icon = $this->urlGenerator->linkToRouteAbsolute('core.Preview.getPreviewByFileId', [
-				'x' => 256,
-				'y' => 256,
-				'fileId' => $recommendation->getNode()->getId(),
-				'c' => $recommendation->getNode()->getEtag(),
-			]);
-			return new WidgetItem($recommendation->getNode()->getName(), '', $url, $icon, $recommendation->getTimestamp());
+		return array_map(function (IRecommendation $recommendation) {
+			$url = $this->urlGenerator->linkToRouteAbsolute(
+				'files.viewcontroller.showFile', ['fileid' => $recommendation->getNode()->getId()]
+			);
+
+			if ($recommendation->hasPreview()) {
+				$icon = $this->urlGenerator->linkToRouteAbsolute('core.Preview.getPreviewByFileId', [
+					'x' => 256,
+					'y' => 256,
+					'fileId' => $recommendation->getNode()->getId(),
+					'c' => $recommendation->getNode()->getEtag(),
+				]);
+			} else {
+				$icon = $this->urlGenerator->getAbsoluteURL(
+					$this->mimeTypeDetector->mimeTypeIcon($recommendation->getNode()->getMimetype())
+				);
+			}
+
+			return new WidgetItem(
+				$recommendation->getNode()->getName(),
+				'',
+				$url,
+				$icon,
+				(string)$recommendation->getTimestamp()
+			);
 		}, $recommendations);
 	}
 }