From 0d0e8a6ea379adf11594684d49a1ce5031339939 Mon Sep 17 00:00:00 2001
From: Andris Reinman <andris@reinman.eu>
Date: Sat, 6 Jul 2024 11:15:57 +0300
Subject: [PATCH] fix(parser): parse subfolders with square brackets

---
 lib/handler/token-parser.js | 14 ++++++++++----
 test/imap-parser-test.js    | 10 ++++++++++
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/lib/handler/token-parser.js b/lib/handler/token-parser.js
index 36d53bf..6a94488 100644
--- a/lib/handler/token-parser.js
+++ b/lib/handler/token-parser.js
@@ -355,10 +355,16 @@ class TokenParser {
                     if (chr === '[') {
                         // allowed only for selected elements
                         if (['BODY', 'BODY.PEEK', 'BINARY', 'BINARY.PEEK'].indexOf(this.currentNode.value.toUpperCase()) < 0) {
-                            let error = new Error(`Unexpected section start char [ at position ${this.pos + i} [E14]`);
-                            error.code = 'ParserError14';
-                            error.parserContext = { input: this.str, pos: this.pos + i, chr };
-                            throw error;
+                            if (/[./]/.test(this.currentNode.value)) {
+                                // could be a path
+                                this.currentNode.value += chr;
+                                break;
+                            } else {
+                                let error = new Error(`Unexpected section start char [ at position ${this.pos + i} [E14]`);
+                                error.code = 'ParserError14';
+                                error.parserContext = { input: this.str, pos: this.pos + i, chr };
+                                throw error;
+                            }
                         }
                         this.currentNode.endPos = this.pos + i;
                         this.currentNode = this.createNode(this.currentNode.parentNode, this.pos + i);
diff --git a/test/imap-parser-test.js b/test/imap-parser-test.js
index 271fc55..e9ea908 100644
--- a/test/imap-parser-test.js
+++ b/test/imap-parser-test.js
@@ -992,3 +992,13 @@ module.exports['IMAP Parser, BAD with throttling'] = test =>
         test.equal(parsed.command, 'BAD');
         test.deepEqual(parsed.attributes, [{ type: 'TEXT', value: 'Request is throttled. Suggested Backoff Time: 92415 milliseconds' }]);
     });
+
+module.exports['IMAP Parser, subfolder square bracket'] = test =>
+    asyncWrapper(test, async test => {
+        let parsed = await parser('* LIST (\\UnMarked) "." INBOX.[Airmail].Snooze');
+        test.deepEqual(parsed.attributes, [
+            [{ type: 'ATOM', value: '\\UnMarked' }],
+            { type: 'STRING', value: '.' },
+            { type: 'ATOM', value: 'INBOX.[Airmail].Snooze' }
+        ]);
+    });