docs: add example of using BlockerFactory with different firewall engines

examples/blocker_factory_usage.go

@@ -0,0 +1,86 @@
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/d3m0k1d/BanForge/internal/blocker"
+	"github.com/d3m0k1d/BanForge/internal/logger"
+)
+
+func main() {
+	// Initialize logger
+	appLogger := logger.New(true)
+
+	// Create factory
+	factory := blocker.NewBlockerFactory(appLogger)
+
+	// Example 1: List all available blockers
+	fmt.Println("Available blockers:")
+	for _, name := range blocker.ListAvailable(appLogger) {
+		fmt.Printf("  - %s\n", name)
+	}
+
+	// Example 2: Use nftables
+	fmt.Println("\n=== NFTables Example ===")
+	nftBlocker, err := factory.Create(blocker.BlockerTypeNftables, "/etc/nftables.conf")
+	if err != nil {
+		log.Fatalf("failed to create nftables blocker: %v", err)
+	}
+
+	// Check if available
+	if !nftBlocker.IsAvailable() {
+		fmt.Println("NFTables is not available on this system")
+	} else {
+		fmt.Printf("Blocker: %s\n", nftBlocker.Name())
+
+		// Setup
+		if err := nftBlocker.Setup(); err != nil {
+			fmt.Printf("Failed to setup: %v\n", err)
+		}
+
+		// Ban an IP
+		if err := nftBlocker.Ban("192.168.1.100"); err != nil {
+			fmt.Printf("Failed to ban IP: %v\n", err)
+		}
+
+		// List banned IPs
+		bannedIPs, err := nftBlocker.List()
+		if err != nil {
+			fmt.Printf("Failed to list IPs: %v\n", err)
+		} else {
+			fmt.Println("Banned IPs:")
+			for _, ip := range bannedIPs {
+				fmt.Printf("  - %s\n", ip)
+			}
+		}
+
+		// Cleanup
+		if err := nftBlocker.Close(); err != nil {
+			fmt.Printf("Failed to close: %v\n", err)
+		}
+	}
+
+	// Example 3: Use UFW
+	fmt.Println("\n=== UFW Example ===")
+	ufwBlocker, err := factory.Create(blocker.BlockerTypeUfw, "")
+	if err != nil {
+		log.Fatalf("failed to create ufw blocker: %v", err)
+	}
+
+	if !ufwBlocker.IsAvailable() {
+		fmt.Println("UFW is not available on this system")
+	} else {
+		fmt.Printf("Blocker: %s\n", ufwBlocker.Name())
+		// UFW operations...
+	}
+
+	// Example 4: Create from string type
+	fmt.Println("\n=== String Type Example ===")
+
+blocker, err := factory.CreateFromString("ufw", "")
+	if err != nil {
+		log.Fatalf("failed to create blocker: %v", err)
+	}
+	fmt.Printf("Created blocker: %s\n", blocker.Name())
+}