Add HomeKit QR code to WebUI #1138 by @mnakada

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"