From 51be3a98205cc900eba6d3cf1962bc42a8de942d Mon Sep 17 00:00:00 2001
From: Andris Reinman <andris@reinman.eu>
Date: Thu, 7 Nov 2024 08:57:50 +0200
Subject: [PATCH] fix(imap): Fixed issue with a single + response

---
 lib/handler/imap-parser.js     | 1 +
 lib/handler/parser-instance.js | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/lib/handler/imap-parser.js b/lib/handler/imap-parser.js
index 165f4bf..cc0574b 100644
--- a/lib/handler/imap-parser.js
+++ b/lib/handler/imap-parser.js
@@ -28,6 +28,7 @@ module.exports = async (command, options) => {
         response.tag = await parser.getTag();
 
         await parser.getSpace();
+
         response.command = await parser.getCommand();
 
         if (nullBytesRemoved) {
diff --git a/lib/handler/parser-instance.js b/lib/handler/parser-instance.js
index 8a567a8..956e1b2 100644
--- a/lib/handler/parser-instance.js
+++ b/lib/handler/parser-instance.js
@@ -119,6 +119,11 @@ class ParserInstance {
 
     async getSpace() {
         if (!this.remainder.length) {
+            if (this.tag === '+' && this.pos === 1) {
+                // special case, empty + response
+                return;
+            }
+
             let error = new Error(`Unexpected end of input at position ${this.pos} [E4]`);
             error.code = 'ParserError4';
             error.parserContext = { input: this.input, pos: this.pos };