kopia/storage/config.go

package storage

import (
	"encoding/json"
	"fmt"
)

// ConnectionInfo represents JSON-serializable configuration of a blob storage.
type ConnectionInfo struct {
	Type   string
	Config interface{}
}

// UnmarshalJSON parses the JSON-encoded data into ConnectionInfo.
func (c *ConnectionInfo) UnmarshalJSON(b []byte) error {
	raw := struct {
		Type string          `json:"type"`
		Data json.RawMessage `json:"config"`
	}{}

	if err := json.Unmarshal(b, &raw); err != nil {
		return err
	}

	c.Type = raw.Type
	f := factories[raw.Type]
	if f == nil {
		return fmt.Errorf("storage type '%v' not registered", raw.Type)
	}
	c.Config = f.defaultConfigFunc()
	if err := json.Unmarshal(raw.Data, c.Config); err != nil {
		return err
	}

	return nil
}

// MarshalJSON returns JSON-encoded storage configuration.
func (c ConnectionInfo) MarshalJSON() ([]byte, error) {
	return json.Marshal(struct {
		Type string      `json:"type"`
		Data interface{} `json:"config"`
	}{
		Type: c.Type,
		Data: c.Config,
	})
}