Add support HomeKit server

pkg/homekit/proxy.go

@@ -0,0 +1,70 @@
+package homekit
+
+import (
+	"bufio"
+	"bytes"
+	"net"
+	"net/http"
+
+	"github.com/AlexxIT/go2rtc/pkg/hap"
+)
+
+func ProxyHandler(pair ServerPair, dial func() (net.Conn, error)) hap.HandlerFunc {
+	return func(controller net.Conn) error {
+		accessory, err := dial()
+		if err != nil {
+			return err
+		}
+
+		// accessory (ex. Camera) => controller (ex. iPhone)
+		go proxy(accessory, controller, nil)
+
+		// controller => accessory
+		return proxy(controller, accessory, pair)
+	}
+}
+
+func proxy(r, w net.Conn, pair ServerPair) error {
+	b := make([]byte, 64*1024)
+	for {
+		n, err := r.Read(b)
+		if err != nil {
+			break
+		}
+
+		if pair != nil && bytes.HasPrefix(b[:n], []byte("POST /pairings HTTP/1.1")) {
+			buf := bytes.NewBuffer(b[:n])
+			req, err := http.ReadRequest(bufio.NewReader(buf))
+			if err != nil {
+				return err
+			}
+
+			res, err := handlePairings(r, req, pair)
+			if err != nil {
+				return err
+			}
+
+			buf.Reset()
+
+			if err = res.Write(buf); err != nil {
+				return err
+			}
+			if _, err = buf.WriteTo(r); err != nil {
+				return err
+			}
+			continue
+		}
+
+		//if n > 512 {
+		//	log.Printf("[hap] %d bytes => %s\n%s...", n, w.RemoteAddr(), b[:512])
+		//} else {
+		//	log.Printf("[hap] %d bytes => %s\n%s", n, w.RemoteAddr(), b[:n])
+		//}
+		if _, err = w.Write(b[:n]); err != nil {
+			break
+		}
+	}
+	_ = r.Close()
+	_ = w.Close()
+	return nil
+}