Simple storage in a JSON file

store.go

package secretstore

import (
	"encoding/json"
	"errors"
	"os"
)

type Secret struct {
	ID    int64  `json:"id"`
	Value string `json:"value"`
}

const filename = ".secret.json"

func Initialize() error {
	// Check if file doesn't exist.
	if _, err := os.Stat(filename); errors.Is(err, os.ErrNotExist) {
		// Create it.
		if err1 := os.WriteFile(filename, []byte("[]"), os.ModePerm); err1 != nil {
			return err1
		}
	}

	return nil
}

func Get() ([]Secret, error) {
	// Read file content.
	content, err := os.ReadFile(filename)
	if err != nil {
		return nil, err
	}

	// Parse it.
	var secrets []Secret
	if err := json.Unmarshal(content, &secrets); err != nil {
		return nil, err
	}

	return secrets, nil
}

func Set(data []Secret) error {
	// Serialize the data.
	out, err := json.MarshalIndent(data, "", "  ")
	if err != nil {
		return err
	}

	// Write it to file.
	return os.WriteFile(filename, out, os.ModePerm)
}