test: cover chat attachments

2025-12-09 23:31:14 +01:00
parent d5347176e1
commit 78d41b8e41
2 changed files with 64 additions and 1 deletions
--- a/src/gateway/chat-attachments.ts
+++ b/src/gateway/chat-attachments.ts
@@ -29,8 +29,13 @@ export function buildMessageWithAttachments(
    }

    let sizeBytes = 0;
+    const b64 = content.trim();
+    // Basic base64 sanity: length multiple of 4 and charset check.
+    if (b64.length % 4 !== 0 || /[^A-Za-z0-9+/=]/.test(b64)) {
+      throw new Error(`attachment ${label}: invalid base64 content`);
+    }
    try {
-      sizeBytes = Buffer.from(content, "base64").byteLength;
+      sizeBytes = Buffer.from(b64, "base64").byteLength;
    } catch {
      throw new Error(`attachment ${label}: invalid base64 content`);
    }