Move the CLI functiontionality to the CLI package

cmd/headscale/cli/utils.go

@@ -0,0 +1,74 @@
+package cli
+
+import (
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/juanfont/headscale"
+	"github.com/spf13/viper"
+	"gopkg.in/yaml.v2"
+	"tailscale.com/tailcfg"
+)
+
+func absPath(path string) string {
+	// If a relative path is provided, prefix it with the the directory where
+	// the config file was found.
+	if (path != "") && !strings.HasPrefix(path, "/") {
+		dir, _ := filepath.Split(viper.ConfigFileUsed())
+		if dir != "" {
+			path = dir + "/" + path
+		}
+	}
+	return path
+}
+
+func getHeadscaleApp() (*headscale.Headscale, error) {
+	derpMap, err := loadDerpMap(absPath(viper.GetString("derp_map_path")))
+	if err != nil {
+		log.Printf("Could not load DERP servers map file: %s", err)
+	}
+
+	cfg := headscale.Config{
+		ServerURL:      viper.GetString("server_url"),
+		Addr:           viper.GetString("listen_addr"),
+		PrivateKeyPath: absPath(viper.GetString("private_key_path")),
+		DerpMap:        derpMap,
+
+		DBhost: viper.GetString("db_host"),
+		DBport: viper.GetInt("db_port"),
+		DBname: viper.GetString("db_name"),
+		DBuser: viper.GetString("db_user"),
+		DBpass: viper.GetString("db_pass"),
+
+		TLSLetsEncryptHostname:      viper.GetString("tls_letsencrypt_hostname"),
+		TLSLetsEncryptCacheDir:      absPath(viper.GetString("tls_letsencrypt_cache_dir")),
+		TLSLetsEncryptChallengeType: viper.GetString("tls_letsencrypt_challenge_type"),
+
+		TLSCertPath: absPath(viper.GetString("tls_cert_path")),
+		TLSKeyPath:  absPath(viper.GetString("tls_key_path")),
+	}
+
+	h, err := headscale.NewHeadscale(cfg)
+	if err != nil {
+		return nil, err
+	}
+	return h, nil
+}
+
+func loadDerpMap(path string) (*tailcfg.DERPMap, error) {
+	derpFile, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer derpFile.Close()
+	var derpMap tailcfg.DERPMap
+	b, err := io.ReadAll(derpFile)
+	if err != nil {
+		return nil, err
+	}
+	err = yaml.Unmarshal(b, &derpMap)
+	return &derpMap, err
+}