Use single quotes for stanzas created by beevik/etree.

Squashed commit of the following:

commit 8e33952869831f620fa289f1bc997128a40eaee3
Author: Martin Dosch <martin@mdosch.de>
Date:   Tue May 9 21:22:40 2023 +0200

    Clean go.mod

commit 11bb88fca2d4bb76557e912f46f726e675e0b0cb
Merge: 8d45413 b01ed4b
Author: Martin Dosch <martin@mdosch.de>
Date:   Tue May 9 21:21:48 2023 +0200

    Merge branch 'master' into singlequotes

commit 8d45413f05
Author: Martin Dosch <martin@mdosch.de>
Date:   Tue May 2 09:39:54 2023 +0200

    Add more singlequotes. :)

commit c496e2596a
Author: Martin Dosch <martin@mdosch.de>
Date:   Tue May 2 09:35:12 2023 +0200

    Use single quotes.

commit e4556759d8
Author: Martin Dosch <martin@mdosch.de>
Date:   Tue May 2 07:25:09 2023 +0200

    Use single quotes for XML attributes.

CHANGELOG.md

@@ -8,6 +8,7 @@
 - Print `--help` output to stdout instead of stderr.
 - Print sent stanzas when `--debug` is used (via go-xmpp commit 9129a110df1b).
 - Allow JIDs without localpart.
+- Use single quotes for attributes in stanzas created by github.com/beevik/etree.
 - Fix SRV lookup when the domain has a CNAME (via xmppsrv v0.2.5).
 
 ## [v0.5.6] 2022-11-11

httpupload.go

@@ -74,6 +74,7 @@ func httpUpload(client *xmpp.Client, iqc chan xmpp.IQ,
 	for _, r := range iqDiscoItemsXMLItems {
 		jid := r.SelectAttr("jid")
 		iqDiscoInfoReqXML := etree.NewDocument()
+		iqDiscoInfoReqXML.WriteSettings.AttrSingleQuote = true
 		iqDiscoInfoReqXMLQuery := iqDiscoInfoReqXML.CreateElement("query")
 		iqDiscoInfoReqXMLQuery.CreateAttr("xmlns", nsDiscoInfo)
 		iqdi, err := iqDiscoInfoReqXML.WriteToString()
@@ -153,6 +154,7 @@ func httpUpload(client *xmpp.Client, iqc chan xmpp.IQ,
 	}
 
 	request := etree.NewDocument()
+	request.WriteSettings.AttrSingleQuote = true
 	requestReq := request.CreateElement("request")
 	requestReq.CreateAttr("xmlns", nsHTTPUpload)
 	requestReq.CreateAttr("filename", fileNameEscaped)

ox.go

@@ -21,6 +21,7 @@ import (
 func oxDeleteNodes(jid string, client *xmpp.Client,
 	iqc chan xmpp.IQ) error {
 	nodeListRequest := etree.NewDocument()
+	nodeListRequest.WriteSettings.AttrSingleQuote = true
 	query := nodeListRequest.CreateElement("query")
 	query.CreateAttr("xmlns", nsDiscoItems)
 	nlr, err := nodeListRequest.WriteToString()
@@ -53,6 +54,7 @@ func oxDeleteNodes(jid string, client *xmpp.Client,
 			continue
 		}
 		deleteNodeRequest := etree.NewDocument()
+		deleteNodeRequest.WriteSettings.AttrSingleQuote = true
 		pubsub := deleteNodeRequest.CreateElement("pubsub")
 		pubsub.CreateAttr("xmlns", nsPubsubOwner)
 		delete := pubsub.CreateElement("delete")
@@ -231,6 +233,7 @@ func oxPublishPubKey(jid string, client *xmpp.Client, iqc chan xmpp.IQ,
 	}
 	pubKeyBase64 := base64.StdEncoding.EncodeToString(keySerialized)
 	root := etree.NewDocument()
+	root.WriteSettings.AttrSingleQuote = true
 	pubsub := root.CreateElement("pubsub")
 	pubsub.CreateAttr("xmlns", nsPubsub)
 	publish := pubsub.CreateElement("publish")
@@ -278,6 +281,7 @@ func oxPublishPubKey(jid string, client *xmpp.Client, iqc chan xmpp.IQ,
 		return errors.New("couldn't successfully verify public key upload")
 	}
 	root = etree.NewDocument()
+	root.WriteSettings.AttrSingleQuote = true
 	pubsub = root.CreateElement("pubsub")
 	pubsub.CreateAttr("xmlns", nsPubsub)
 	publish = pubsub.CreateElement("publish")
@@ -481,6 +485,7 @@ func oxGenPrivKey(jid string, client *xmpp.Client, iqc chan xmpp.IQ,
 func oxRecvPublicKeys(client *xmpp.Client, iqc chan xmpp.IQ, recipient string,
 	fingerprint string) (*crypto.KeyRing, error) {
 	opkr := etree.NewDocument()
+	opkr.WriteSettings.AttrSingleQuote = true
 	opkrPs := opkr.CreateElement("pubsub")
 	opkrPs.CreateAttr("xmlns", nsPubsub)
 	opkrPsItems := opkrPs.CreateElement("items")
@@ -555,6 +560,7 @@ func oxGetPublicKeyRing(client *xmpp.Client, iqc chan xmpp.IQ,
 	}
 
 	oxPubKeyListReq := etree.NewDocument()
+	oxPubKeyListReq.WriteSettings.AttrSingleQuote = true
 	oxPubKeyListReqPs := oxPubKeyListReq.CreateElement("pubsub")
 	oxPubKeyListReqPs.CreateAttr("xmlns", nsPubsub)
 	oxPubKeyListReqPsItems := oxPubKeyListReqPs.CreateElement("items")
@@ -708,6 +714,7 @@ func oxEncrypt(client *xmpp.Client, iqc chan xmpp.IQ, oxPrivKey *crypto.Key,
 		}
 	}
 	oxCryptMessage := etree.NewDocument()
+	oxCryptMessage.WriteSettings.AttrSingleQuote = true
 	oxCryptMessageSc := oxCryptMessage.CreateElement("signcrypt")
 	oxCryptMessageSc.CreateAttr("xmlns", nsOx)
 	oxCryptMessageScTo := oxCryptMessageSc.CreateElement("to")
@@ -730,6 +737,7 @@ func oxEncrypt(client *xmpp.Client, iqc chan xmpp.IQ, oxPrivKey *crypto.Key,
 		return "error", err
 	}
 	om := etree.NewDocument()
+	om.WriteSettings.AttrSingleQuote = true
 	omMessage := om.CreateElement("message")
 	omMessage.CreateAttr("to", recipient)
 	omMessage.CreateAttr("id", getID())

stanzahandling.go

@@ -63,6 +63,7 @@ func rcvStanzas(client *xmpp.Client, iqc chan xmpp.IQ, msgc chan xmpp.Chat) {
 				switch xmlns.Value {
 				case nsDiscoInfo:
 					root := etree.NewDocument()
+					root.WriteSettings.AttrSingleQuote = true
 					reply := root.CreateElement("iq")
 					reply.CreateAttr("type", "result")
 					reply.CreateAttr("from", client.JID())
@@ -85,6 +86,7 @@ func rcvStanzas(client *xmpp.Client, iqc chan xmpp.IQ, msgc chan xmpp.Chat) {
 					}
 				default:
 					root := etree.NewDocument()
+					root.WriteSettings.AttrSingleQuote = true
 					reply := root.CreateElement("iq")
 					reply.CreateAttr("type", "error")
 					reply.CreateAttr("from", client.JID())
@@ -104,6 +106,7 @@ func rcvStanzas(client *xmpp.Client, iqc chan xmpp.IQ, msgc chan xmpp.Chat) {
 				}
 			case "set":
 				root := etree.NewDocument()
+				root.WriteSettings.AttrSingleQuote = true
 				reply := root.CreateElement("iq")
 				reply.CreateAttr("type", "error")
 				reply.CreateAttr("from", client.JID())