Optionally redact the exported thread data

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

1 files changed, 13 insertions, 0 deletions

diff --git a/lib/IMAP/Threading/DatabaseMessage.php b/lib/IMAP/Threading/DatabaseMessage.php
index d36001885..da79522ce 100644
--- a/lib/IMAP/Threading/DatabaseMessage.php
+++ b/lib/IMAP/Threading/DatabaseMessage.php
@@ -26,6 +26,7 @@ declare(strict_types=1);
 namespace OCA\Mail\IMAP\Threading;
 
 use JsonSerializable;
+use function array_map;
 use function array_merge;
 use function json_decode;
 
@@ -91,6 +92,18 @@ class DatabaseMessage extends Message implements JsonSerializable {
 		return $this->dirty;
 	}
 
+	public function redact(callable $hash): DatabaseMessage {
+		return new self(
+			$this->databaseId,
+			$this->hasReSubject() ? "Re: " . $hash($this->getSubject()) : $hash($this->getSubject()),
+			$hash($this->getId()),
+			array_map(function (string $ref) use ($hash) {
+				return $hash($ref);
+			}, $this->getReferences()),
+			$this->threadRootId === null ? null : $hash($this->threadRootId)
+		);
+	}
+
 	public function jsonSerialize(): array {
 		return array_merge(
 			parent::jsonSerialize(),