Add a websocket transport

go.mod

@@ -3,6 +3,7 @@ module gosrc.io/xmpp
 go 1.12
 
 require (
-	github.com/google/go-cmp v0.3.0
+	github.com/google/go-cmp v0.3.1
 	golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7
+	nhooyr.io/websocket v1.6.5
 )

go.sum

@@ -1,6 +1,103 @@
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websocket_transport.go

@@ -0,0 +1,50 @@
+package xmpp
+
+import (
+	"context"
+	"errors"
+	"net"
+	"strings"
+	"time"
+
+	"nhooyr.io/websocket"
+)
+
+type WebsocketTransport struct {
+	wsConn  *websocket.Conn
+	netConn net.Conn
+	ctx     context.Context
+}
+
+func (t *WebsocketTransport) Connect(address string, c Config) error {
+	t.ctx = context.Background()
+
+	ctx, cancel := context.WithTimeout(t.ctx, time.Duration(c.ConnectTimeout)*time.Second)
+	defer cancel()
+
+	if !c.Insecure && strings.HasPrefix(address, "wss:") {
+		return errors.New("Websocket address is not secure")
+	}
+	wsConn, _, err := websocket.Dial(ctx, address, nil)
+	if err != nil {
+		t.wsConn = wsConn
+		t.netConn = websocket.NetConn(t.ctx, t.wsConn, websocket.MessageText)
+	}
+	return err
+}
+
+func (t WebsocketTransport) DoesStartTLS() bool {
+	return false
+}
+
+func (t WebsocketTransport) Read(p []byte) (n int, err error) {
+	return t.netConn.Read(p)
+}
+
+func (t WebsocketTransport) Write(p []byte) (n int, err error) {
+	return t.netConn.Write(p)
+}
+
+func (t WebsocketTransport) Close() error {
+	return t.netConn.Close()
+}