feat: add more encryption checks to info:file

Signed-off-by: Robin Appelman <robin@icewind.nl>

core/Command/Info/File.php

@@ -8,6 +8,7 @@ declare(strict_types=1);
 namespace OC\Core\Command\Info;
 
 use OC\Files\ObjectStore\ObjectStoreStorage;
+use OC\Files\Storage\Wrapper\Encryption;
 use OC\Files\View;
 use OCA\Files_External\Config\ExternalMountPoint;
 use OCA\GroupFolders\Mount\GroupMountPoint;
@@ -71,6 +72,15 @@ class File extends Command {
 			} else {
 				$output->writeln('    <error>encryption key not found</error> should be located at: ' . $keyPath);
 			}
+			$storage = $node->getStorage();
+			if ($storage->instanceOfStorage(Encryption::class)) {
+				/** @var Encryption $storage */
+				if (!$storage->hasValidHeader($node->getInternalPath())) {
+					$output->writeln('    <error>file doesn\'t have a valid encryption header</error>');
+				}
+			} else {
+				$output->writeln('    <error>file is marked as encrypted, but encryption doesn\'t seem to be setup</error>');
+			}
 		}
 
 		if ($node instanceof Folder && $node->isEncrypted() || $node instanceof OCPFile && $node->getParent()->isEncrypted()) {

lib/private/Files/Storage/Wrapper/Encryption.php

@@ -894,4 +894,16 @@ class Encryption extends Wrapper {
 	public function setEnabled(bool $enabled): void {
 		$this->enabled = $enabled;
 	}
+
+	/**
+	 * Check if the on-disk data for a file has a valid encrypted header
+	 *
+	 * @param string $path
+	 * @return bool
+	 */
+	public function hasValidHeader(string $path): bool {
+		$firstBlock = $this->readFirstBlock($path);
+		$header = $this->util->parseRawHeader($firstBlock);
+		return (count($header) > 0);
+	}
 }