From bc1c26aef41bcc09d1e36afd84f65bf5f3f6aac8 Mon Sep 17 00:00:00 2001
From: Max Leiter <8675906+MaxLeiter@users.noreply.github.com>
Date: Thu, 9 Apr 2026 23:36:52 -0700
Subject: [PATCH] ircv3: ACCOUNTEXTBAN support

---
 src/commands/handlers/registration.js | 10 +++
 src/networkinfo.js                    |  9 +++
 test/networkinfo.test.js              | 88 +++++++++++++++++++++++++++
 3 files changed, 107 insertions(+)

diff --git a/src/commands/handlers/registration.js b/src/commands/handlers/registration.js
index 7d9daf97..6b3fbdeb 100644
--- a/src/commands/handlers/registration.js
+++ b/src/commands/handlers/registration.js
@@ -87,6 +87,16 @@ const handlers = {
             } else if (option[0] === 'CLIENTTAGDENY') {
                 // https://ircv3.net/specs/extensions/message-tags#rpl_isupport-tokens
                 handler.network.options.CLIENTTAGDENY = option[1].split(',').filter((f) => !!f);
+            } else if (option[0] === 'EXTBAN') {
+                // https://ircv3.net/specs/extensions/account-extban
+                const parts = option[1].split(',');
+                handler.network.options.EXTBAN = {
+                    prefix: parts[0] || '',
+                    types: parts.slice(1).join('').split(''),
+                };
+            } else if (option[0] === 'ACCOUNTEXTBAN') {
+                // https://ircv3.net/specs/extensions/account-extban
+                handler.network.options.ACCOUNTEXTBAN = option[1].split(',').filter((f) => !!f);
             } else if (option[0] === 'NETWORK') {
                 handler.network.name = option[1];
             } else if (option[0] === 'NAMESX' && !handler.network.cap.isEnabled('multi-prefix')) {
diff --git a/src/networkinfo.js b/src/networkinfo.js
index e759e144..8e94f4f8 100644
--- a/src/networkinfo.js
+++ b/src/networkinfo.js
@@ -97,6 +97,15 @@ function NetworkInfo() {
         return this.options.CLIENTTAGDENY.some((tag) => tag === `-${tag_name}`);
     };
 
+    this.accountBanMask = function accountBanMask(account) {
+        if (!this.options.EXTBAN || !this.options.ACCOUNTEXTBAN || !this.options.ACCOUNTEXTBAN.length) {
+            return null;
+        }
+
+        const type = this.options.ACCOUNTEXTBAN[0];
+        return this.options.EXTBAN.prefix + type + ':' + account;
+    };
+
     this.isChannelName = function isChannelName(channel_name) {
         if (typeof channel_name !== 'string' || channel_name === '') {
             return false;
diff --git a/test/networkinfo.test.js b/test/networkinfo.test.js
index 44a4254b..14307bd4 100644
--- a/test/networkinfo.test.js
+++ b/test/networkinfo.test.js
@@ -156,4 +156,92 @@ describe('src/networkinfo.js', function() {
             assert.isFalse(client.network.supportsTag('b'));
         });
     });
+
+    describe('EXTBAN and ACCOUNTEXTBAN support', function() {
+        it('should parse EXTBAN into prefix and types', function() {
+            const client = newMockClient();
+            client.dispatch({
+                command: '005',
+                params: ['nick', 'EXTBAN=$,ARar'],
+                tags: []
+            });
+            assert.deepEqual(client.network.options.EXTBAN, {
+                prefix: '$',
+                types: ['A', 'R', 'a', 'r'],
+            });
+        });
+
+        it('should parse EXTBAN with tilde prefix', function() {
+            const client = newMockClient();
+            client.dispatch({
+                command: '005',
+                params: ['nick', 'EXTBAN=~,a'],
+                tags: []
+            });
+            assert.deepEqual(client.network.options.EXTBAN, {
+                prefix: '~',
+                types: ['a'],
+            });
+        });
+
+        it('should parse ACCOUNTEXTBAN as a list', function() {
+            const client = newMockClient();
+            client.dispatch({
+                command: '005',
+                params: ['nick', 'ACCOUNTEXTBAN=a,account'],
+                tags: []
+            });
+            assert.deepEqual(client.network.options.ACCOUNTEXTBAN, ['a', 'account']);
+        });
+
+        it('should parse single ACCOUNTEXTBAN value', function() {
+            const client = newMockClient();
+            client.dispatch({
+                command: '005',
+                params: ['nick', 'ACCOUNTEXTBAN=R'],
+                tags: []
+            });
+            assert.deepEqual(client.network.options.ACCOUNTEXTBAN, ['R']);
+        });
+
+        it('should construct account ban mask with $ prefix', function() {
+            const client = newMockClient();
+            client.dispatch({
+                command: '005',
+                params: ['nick', 'EXTBAN=$,ARar', 'ACCOUNTEXTBAN=R'],
+                tags: []
+            });
+            assert.equal(client.network.accountBanMask('bob'), '$R:bob');
+        });
+
+        it('should construct account ban mask with ~ prefix', function() {
+            const client = newMockClient();
+            client.dispatch({
+                command: '005',
+                params: ['nick', 'EXTBAN=~,a', 'ACCOUNTEXTBAN=a,account'],
+                tags: []
+            });
+            assert.equal(client.network.accountBanMask('bob'), '~a:bob');
+        });
+
+        it('should return null when EXTBAN is not available', function() {
+            const client = newMockClient();
+            client.dispatch({
+                command: '005',
+                params: ['nick', 'ACCOUNTEXTBAN=R'],
+                tags: []
+            });
+            assert.isNull(client.network.accountBanMask('bob'));
+        });
+
+        it('should return null when ACCOUNTEXTBAN is not available', function() {
+            const client = newMockClient();
+            client.dispatch({
+                command: '005',
+                params: ['nick', 'EXTBAN=$,ARar'],
+                tags: []
+            });
+            assert.isNull(client.network.accountBanMask('bob'));
+        });
+    });
 });