Add support for SASL EXTERNAL mechanism

examples/simple-tor.go/simple-tor.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"github.com/thoj/go-ircevent"
+	"crypto/tls"
+	"log"
+	"os"
+)
+
+const addr = "libera75jm6of4wxpxt4aynol3xjmbtxgfyjpu34ss4d7r7q2v5zrpyd.onion:6697"
+
+// This demos connecting to Libera.Chat over TOR using SASL EXTERNAL and a TLS
+// client cert. It assumes a TOR SOCKS service is running on localhost:9050
+// and requires an existing account with a fingerprint already registered. See
+// https://libera.chat/guides/connect#accessing-liberachat-via-tor for details.
+//
+// Pass the full path to your cert and key on the command line like so:
+// $ go run simple-tor.go my-nick my-cert.pem my-key.pem
+
+func main() {
+	os.Setenv("ALL_PROXY", "socks5h://localhost:9050")
+	nick, certFile := os.Args[1], os.Args[2]
+	keyFile := certFile
+	if len(os.Args) == 4 {
+		keyFile = os.Args[3]
+	}
+	clientCert, err := tls.LoadX509KeyPair(certFile, keyFile)
+	if err != nil {
+		log.Fatal(err)
+	}
+	ircnick1 := nick
+	irccon := irc.IRC(ircnick1, nick)
+	irccon.VerboseCallbackHandler = true
+	irccon.UseSASL = true
+	irccon.SASLMech = "EXTERNAL"
+	irccon.Debug = true
+	irccon.UseTLS = true
+	irccon.TLSConfig = &tls.Config{
+		InsecureSkipVerify: true,
+		Certificates: []tls.Certificate{clientCert},
+	}
+	irccon.AddCallback("001", func(e *irc.Event) {})
+	irccon.AddCallback("376", func(e *irc.Event) {
+		log.Println("Quitting")
+		irccon.Quit()
+	})
+	err = irccon.Connect(addr)
+	if err != nil {
+		log.Fatal(err)
+	}
+	irccon.Loop()
+}