primeiro commit

internal/config/config.go

@@ -0,0 +1,63 @@
+// Package config loads he-dydns configuration from a TOML file.
+package config
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/BurntSushi/toml"
+)
+
+const DefaultIntervalMinutes = 5
+
+// Entry describes a single Hurricane Electric dynamic DNS hostname to keep updated.
+type Entry struct {
+	Hostname string `toml:"hostname"`
+	Token    string `toml:"token"`
+}
+
+// Config is the top-level he-dydns configuration.
+type Config struct {
+	// Interface, if set, restricts address discovery to this network
+	// interface instead of guessing the public IP via an external service.
+	Interface string `toml:"interface"`
+	// IntervalMinutes controls how often updates run in daemon mode.
+	IntervalMinutes int     `toml:"interval_minutes"`
+	Entries         []Entry `toml:"entries"`
+}
+
+// DefaultPath returns $HOME/.config/he-dydns/config.toml.
+func DefaultPath() (string, error) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return "", fmt.Errorf("determining home directory: %w", err)
+	}
+	return filepath.Join(home, ".config", "he-dydns", "config.toml"), nil
+}
+
+// Load reads and validates the configuration file at path.
+func Load(path string) (*Config, error) {
+	var cfg Config
+	if _, err := toml.DecodeFile(path, &cfg); err != nil {
+		return nil, fmt.Errorf("reading config %s: %w", path, err)
+	}
+
+	if len(cfg.Entries) == 0 {
+		return nil, fmt.Errorf("config %s: no entries defined", path)
+	}
+	for i, e := range cfg.Entries {
+		if e.Hostname == "" {
+			return nil, fmt.Errorf("config %s: entries[%d] missing hostname", path, i)
+		}
+		if e.Token == "" {
+			return nil, fmt.Errorf("config %s: entries[%d] missing token", path, i)
+		}
+	}
+
+	if cfg.IntervalMinutes <= 0 {
+		cfg.IntervalMinutes = DefaultIntervalMinutes
+	}
+
+	return &cfg, nil
+}