feat(json): expose voice-note attachment metadata

Include isVoiceNote in receive JSON and JSON-RPC attachment payloads. Add regression coverage for true and false serialization.

src/main/java/org/asamk/signal/json/JsonAttachment.java

@@ -13,7 +13,8 @@ record JsonAttachment(
         Integer width,
         Integer height,
         String caption,
-        Long uploadTimestamp
+        Long uploadTimestamp,
+        boolean isVoiceNote
 ) {
 
     static JsonAttachment from(MessageEnvelope.Data.Attachment attachment) {
@@ -32,6 +33,7 @@ record JsonAttachment(
                 width,
                 height,
                 caption,
-                uploadTimestamp);
+                uploadTimestamp,
+                attachment.isVoiceNote());
     }
 }

src/test/java/org/asamk/signal/json/JsonAttachmentTest.java

@@ -0,0 +1,47 @@
+package org.asamk.signal.json;
+
+import org.asamk.signal.manager.api.MessageEnvelope;
+import org.asamk.signal.util.Util;
+import org.junit.jupiter.api.Test;
+
+import java.util.Optional;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class JsonAttachmentTest {
+
+    @Test
+    void serializesVoiceNoteFlag() {
+        assertVoiceNoteFlag(true);
+    }
+
+    @Test
+    void serializesNonVoiceNoteFlag() {
+        assertVoiceNoteFlag(false);
+    }
+
+    private static void assertVoiceNoteFlag(final boolean isVoiceNote) {
+        final var attachment = new MessageEnvelope.Data.Attachment(Optional.empty(),
+                Optional.empty(),
+                Optional.empty(),
+                "audio/aac",
+                Optional.empty(),
+                Optional.empty(),
+                Optional.empty(),
+                Optional.empty(),
+                Optional.empty(),
+                Optional.empty(),
+                Optional.empty(),
+                isVoiceNote,
+                false,
+                false);
+
+        final var jsonAttachment = JsonAttachment.from(attachment);
+        final var json = Util.createJsonObjectMapper().valueToTree(jsonAttachment);
+
+        assertEquals(isVoiceNote, jsonAttachment.isVoiceNote());
+        assertTrue(json.has("isVoiceNote"));
+        assertEquals(isVoiceNote, json.get("isVoiceNote").booleanValue());
+    }
+}