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|
package config
import (
"encoding/json"
"fmt"
"log/slog"
"os"
"github.com/go-playground/validator/v10"
)
type Config struct {
LogLevel slog.Level `json:"LogLevel" validate:"required"`
Storage StorageConfig `json:"Storage" validate:"required"`
}
type StorageConfig struct {
Type string `json:"Type" validate:"required,oneof=b2"`
Config any `json:"Config" validate:"required"`
}
func (sc *StorageConfig) UnmarshalJSON(data []byte) error {
var tmp struct {
Type string `json:"Type"`
Config json.RawMessage `json:"Config"`
}
if err := json.Unmarshal(data, &tmp); err != nil {
return err
}
sc.Type = tmp.Type
switch tmp.Type {
case "b2":
var b2Config B2Config
if err := json.Unmarshal(tmp.Config, &b2Config); err != nil {
return fmt.Errorf("unmarshal B2Config: %w", err)
}
sc.Config = &b2Config
default:
return fmt.Errorf("unsupported storage type: %s", tmp.Type)
}
return nil
}
type B2Config struct {
BucketName string `json:"BucketName" validate:"required,min=1"`
Region string `json:"Region" validate:"required,min=1"`
Prefix string `json:"Prefix"`
KeyID string `json:"KeyID"`
ApplicationKey string `json:"ApplicationKey"`
}
func LoadConfig(path string, config *Config) error {
fileBytes, err := os.ReadFile(path)
if err != nil {
return err
}
expandedFileBytes := []byte(os.ExpandEnv(string(fileBytes)))
if err = json.Unmarshal(expandedFileBytes, config); err != nil {
return err
}
return nil
}
func InitConfig(path string) (*Config, error) {
config := &Config{}
if err := LoadConfig(path, config); err != nil {
return nil, err
}
validate := validator.New(validator.WithRequiredStructEnabled())
if err := validate.Struct(config); err != nil {
return nil, err
}
return config, nil
}
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