feat: add Fiber HTTPS server with embedded static files

internal/server/net.go

@@ -0,0 +1,34 @@
+package server
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"fmt"
+	"log/slog"
+	"net"
+)
+
+// GetLANIP returns the first non-loopback IPv4 address.
+func GetLANIP() (string, error) {
+	addrs, err := net.InterfaceAddrs()
+	if err != nil {
+		return "", err
+	}
+	for _, addr := range addrs {
+		if ipNet, ok := addr.(*net.IPNet); ok && !ipNet.IP.IsLoopback() && ipNet.IP.To4() != nil {
+			return ipNet.IP.String(), nil
+		}
+	}
+	return "", fmt.Errorf("no LAN IP found")
+}
+
+// GenerateToken creates a cryptographically random token for WS auth.
+func GenerateToken() string {
+	b := make([]byte, 16)
+	if _, err := rand.Read(b); err != nil {
+		slog.Error("failed to generate token", "error", err)
+		// Fallback to a less secure but functional token
+		return "voicepaste-fallback-token"
+	}
+	return hex.EncodeToString(b)
+}