Add HomeKit QR code to WebUI #1138 by @mnakada

pkg/hap/helpers.go

@@ -3,6 +3,8 @@ package hap
 import (
 	"crypto/ed25519"
 	"crypto/rand"
+	"crypto/sha512"
+	"encoding/base64"
 	"encoding/hex"
 	"errors"
 	"fmt"
@@ -99,6 +101,12 @@ func GenerateUUID() string {
 	return s[:8] + "-" + s[8:12] + "-" + s[12:16] + "-" + s[16:20] + "-" + s[20:]
 }
 
+func SetupHash(setupID, deviceID string) string {
+	// should be setup_id (random 4 alphanum) + device_id (mac address)
+	b := sha512.Sum512([]byte(setupID + deviceID))
+	return base64.StdEncoding.EncodeToString(b[:4])
+}
+
 func Append(items ...any) (b []byte) {
 	for _, item := range items {
 		switch v := item.(type) {

pkg/hap/server.go

@@ -3,7 +3,6 @@ package hap
 import (
 	"bufio"
 	"crypto/sha512"
-	"encoding/base64"
 	"errors"
 	"fmt"
 	"net/http"
@@ -36,13 +35,6 @@ func (s *Server) ServerPublic() []byte {
 //	return StatusPaired
 //}
 
-func (s *Server) SetupHash() string {
-	// should be setup_id (random 4 alphanum) + device_id (mac address)
-	// but device_id is random, so OK
-	b := sha512.Sum512([]byte(s.DeviceID))
-	return base64.StdEncoding.EncodeToString(b[:4])
-}
-
 func (s *Server) PairSetup(req *http.Request, rw *bufio.ReadWriter) (id string, publicKey []byte, err error) {
 	// STEP 1. Request from iPhone
 	var plainM1 struct {

pkg/hap/setup/setup.go

@@ -0,0 +1,32 @@
+package setup
+
+import (
+	"strconv"
+	"strings"
+)
+
+const (
+	FlagNFC = 1
+	FlagIP  = 2
+	FlagBLE = 4
+	FlagWAC = 8 // Wireless Accessory Configuration (WAC)/Apples MFi
+)
+
+func GenerateSetupURI(category, pin, setupID string) string {
+	c, _ := strconv.Atoi(category)
+	p, _ := strconv.Atoi(strings.ReplaceAll(pin, "-", ""))
+	payload := int64(c&0xFF)<<31 | int64(FlagIP&0xF)<<27 | int64(p&0x7FFFFFF)
+	return "X-HM://" + FormatInt36(payload, 9) + setupID
+}
+
+// FormatInt36 equal to strings.ToUpper(fmt.Sprintf("%0"+strconv.Itoa(n)+"s", strconv.FormatInt(value, 36)))
+func FormatInt36(value int64, n int) string {
+	b := make([]byte, n)
+	for i := n - 1; 0 <= i; i-- {
+		b[i] = digits[value%36]
+		value /= 36
+	}
+	return string(b)
+}
+
+const digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"

pkg/hap/setup/setup_test.go

@@ -0,0 +1,18 @@
+package setup
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestFormatAlphaNum(t *testing.T) {
+	value := int64(999)
+	n := 5
+	s1 := strings.ToUpper(fmt.Sprintf("%0"+strconv.Itoa(n)+"s", strconv.FormatInt(value, 36)))
+	s2 := FormatInt36(value, n)
+	require.Equal(t, s1, s2)
+}