feat: config/users import/export (#613)

Supports json and yaml.

Former-commit-id: d36b07953ede1842942b7ab477effeb2e5aa7d5b [formerly 51d0d5691d19e0649935816779a34b1b700e088a] [formerly 342f636293be8e38e7907453a67c67e5e9195c78 [formerly 73b8d2ee7e]]
Former-commit-id: 8ef6a1563ebe425a15a8229165d2ddb043cefb21 [formerly 01c4ac1d89e0d5c6ed16bb7f23c2bbe62085d6e5]
Former-commit-id: 6d197ee1931889571c61ad0920e4352d4b02b264

cmd/config_import.go

@@ -0,0 +1,76 @@
+package cmd
+
+import (
+	"encoding/json"
+	"errors"
+	"reflect"
+
+	"github.com/filebrowser/filebrowser/v2/auth"
+	"github.com/filebrowser/filebrowser/v2/settings"
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	configCmd.AddCommand(configImportCmd)
+}
+
+type settingsFile struct {
+	Settings *settings.Settings `json:"settings"`
+	Auther   interface{}        `json:"auther"`
+}
+
+var configImportCmd = &cobra.Command{
+	Use: "import <filename>",
+	Short: `Import a configuration file. This will replace all the existing
+configuration. Can be used with or without unexisting databases.
+If used with a nonexisting database, a key will be generated
+automatically. Otherwise the key will be kept the same as in the
+database.`,
+	Args: jsonYamlArg,
+	Run: python(func(cmd *cobra.Command, args []string, d pythonData) {
+		var key []byte
+		if d.hadDB {
+			settings, err := d.store.Settings.Get()
+			checkErr(err)
+			key = settings.Key
+		} else {
+			key = generateRandomBytes(64)
+		}
+
+		file := settingsFile{}
+		err := unmarshal(args[0], &file)
+		checkErr(err)
+
+		file.Settings.Key = key
+		err = d.store.Settings.Save(file.Settings)
+		checkErr(err)
+
+		autherInterf := cleanUpInterfaceMap(file.Auther.(map[interface{}]interface{}))
+
+		var auther auth.Auther
+		switch file.Settings.AuthMethod {
+		case auth.MethodJSONAuth:
+			auther = getAuther(auth.JSONAuth{}, autherInterf).(*auth.JSONAuth)
+		case auth.MethodNoAuth:
+			auther = getAuther(auth.NoAuth{}, autherInterf).(*auth.NoAuth)
+		case auth.MethodProxyAuth:
+			auther = getAuther(auth.ProxyAuth{}, autherInterf).(*auth.ProxyAuth)
+		default:
+			checkErr(errors.New("invalid auth method"))
+		}
+
+		err = d.store.Auth.Save(auther)
+		checkErr(err)
+		printSettings(file.Settings, auther)
+	}, pythonConfig{allowNoDB: true}),
+}
+
+func getAuther(sample auth.Auther, data interface{}) interface{} {
+	authType := reflect.TypeOf(sample)
+	auther := reflect.New(authType).Interface()
+	bytes, err := json.Marshal(data)
+	checkErr(err)
+	err = json.Unmarshal(bytes, &auther)
+	checkErr(err)
+	return auther
+}