From 268953a4451c7454fa22f44be0097451e59405a5 Mon Sep 17 00:00:00 2001
From: Martin Dosch <martin@mdosch.de>
Date: Sun, 29 Oct 2023 10:20:44 +0100
Subject: [PATCH] Reply to XEP-0092 software version requests.

---
 CHANGELOG.md      |  2 ++
 const.go          |  1 +
 stanzahandling.go | 26 ++++++++++++++++++++++++++
 3 files changed, 29 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index df1ce23..fa6cd4f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
 # Changelog
 
 ## Unreleased
+## Added
+- Reply to XEP-0092 software version requests.
 
 ## [v0.6.2] 2023-09-29
 ### Changed
diff --git a/const.go b/const.go
index 909fa0b..aeafd54 100644
--- a/const.go
+++ b/const.go
@@ -36,6 +36,7 @@ const (
 	nsOxPubKeys    = "urn:xmpp:openpgp:0:public-keys"
 	nsPubsub       = "http://jabber.org/protocol/pubsub"
 	nsPubsubOwner  = "http://jabber.org/protocol/pubsub#owner"
+	nsVersion      = "jabber:iq:version"
 	nsXMPPStanzas  = "urn:ietf:params:xml:ns:xmpp-stanzas"
 	// strings
 	oxAltBody        = "This message is encrypted (XEP-0373: OpenPGP for XMPP)."
diff --git a/stanzahandling.go b/stanzahandling.go
index 7e1e7ae..d47ec1c 100644
--- a/stanzahandling.go
+++ b/stanzahandling.go
@@ -8,6 +8,7 @@ import (
 	"context"
 	"fmt"
 	"log"
+	"runtime"
 
 	"github.com/beevik/etree"  // BSD-2-clause
 	"github.com/mattn/go-xmpp" // BSD-3-Clause
@@ -85,6 +86,31 @@ func rcvStanzas(client *xmpp.Client, iqc chan xmpp.IQ, msgc chan xmpp.Chat, ctx
 					identity.CreateAttr("name", "go-sendxmpp")
 					feat := replyQuery.CreateElement("feature")
 					feat.CreateAttr("var", nsDiscoInfo)
+					feat2 := replyQuery.CreateElement("feature")
+					feat2.CreateAttr("var", nsVersion)
+					xmlString, err := root.WriteToString()
+					if err == nil {
+						_, err = client.SendOrg(xmlString)
+						if err != nil {
+							log.Println(err)
+						}
+					}
+				case nsVersion:
+					root := etree.NewDocument()
+					root.WriteSettings.AttrSingleQuote = true
+					reply := root.CreateElement("iq")
+					reply.CreateAttr("type", "result")
+					reply.CreateAttr("from", client.JID())
+					reply.CreateAttr("to", v.From)
+					reply.CreateAttr("id", v.ID)
+					replyQuery := reply.CreateElement("query")
+					replyQuery.CreateAttr("xmlns", nsVersion)
+					rqName := replyQuery.CreateElement("name")
+					rqName.CreateText("go-sendxmpp")
+					rqVersion := replyQuery.CreateElement("version")
+					rqVersion.CreateText(version)
+					rqOS := replyQuery.CreateElement("os")
+					rqOS.CreateText(runtime.GOOS)
 					xmlString, err := root.WriteToString()
 					if err == nil {
 						_, err = client.SendOrg(xmlString)