mondern slopify hand crafted code for the greater good.

(move from user specified blocklist download URLs to simply country codes with multiple providers available.)

config.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"strings"
+)
+
+// Config represents the blocklist configuration file.
+type Config struct {
+	// ListName is the name for the RouterOS address list (e.g. "CountryIPBlocks").
+	ListName string `json:"list_name"`
+
+	// Provider specifies which GeoIP data source to use.
+	// Supported values: "ipverse" (default), "ipdeny"
+	Provider string `json:"provider"`
+
+	// Countries is a list of ISO 3166-1 alpha-2 country codes (lowercase).
+	Countries []string `json:"countries"`
+}
+
+// LoadConfig reads and validates a blocklist configuration file.
+func LoadConfig(filename string) (*Config, error) {
+	b, err := os.ReadFile(filename)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read config file %q: %v", filename, err)
+	}
+
+	var cfg Config
+	if err := json.Unmarshal(b, &cfg); err != nil {
+		return nil, fmt.Errorf("failed to parse config file %q: %v", filename, err)
+	}
+
+	// Validate
+	if cfg.ListName == "" {
+		return nil, fmt.Errorf("config: list_name is required")
+	}
+
+	if cfg.Provider == "" {
+		cfg.Provider = "ipverse" // default provider
+	}
+	cfg.Provider = strings.ToLower(cfg.Provider)
+
+	if len(cfg.Countries) == 0 {
+		return nil, fmt.Errorf("config: at least one country code is required")
+	}
+
+	// Normalize country codes to lowercase
+	for i := range cfg.Countries {
+		cfg.Countries[i] = strings.ToLower(strings.TrimSpace(cfg.Countries[i]))
+	}
+
+	return &cfg, nil
+}