feat(settings): Cache app discover images to ensure privacy of users

Co-authored-by: Benjamin Gaussorgues <benjamin.gaussorgues@nextcloud.com>
Co-authored-by: Ferdinand Thiessen <opensource@fthiessen.de>

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

1 files changed, 16 insertions, 0 deletions

diff --git a/lib/private/App/AppStore/Fetcher/AppDiscoverFetcher.php b/lib/private/App/AppStore/Fetcher/AppDiscoverFetcher.php
index 17ee446aaa1..48dba6d48dc 100644
--- a/lib/private/App/AppStore/Fetcher/AppDiscoverFetcher.php
+++ b/lib/private/App/AppStore/Fetcher/AppDiscoverFetcher.php
@@ -97,4 +97,20 @@ class AppDiscoverFetcher extends Fetcher {
 
 		return $entries;
 	}
+
+	public function getETag(): string|null {
+		$rootFolder = $this->appData->getFolder('/');
+
+		try {
+			$file = $rootFolder->getFile($this->fileName);
+			$jsonBlob = json_decode($file->getContent(), true);
+
+			if (is_array($jsonBlob) && isset($jsonBlob['ETag'])) {
+				return (string)$jsonBlob['ETag'];
+			}
+		} catch (\Throwable $e) {
+			// ignore
+		}
+		return null;
+	}
 }