feat: add Vault

Co-authored-by: Dmitry Fedotov <dmitry@uint32.ru>
Co-committed-by: Dmitry Fedotov <dmitry@uint32.ru>

internal/vault/vault.go

@@ -0,0 +1,99 @@
+package vault
+
+import (
+	"context"
+	"encoding/base64"
+	"errors"
+
+	"github.com/hashicorp/vault/api"
+)
+
+type Storage struct {
+	client *api.Client
+	path   string
+}
+
+func Open(token string, path string, addr string) (*Storage, error) {
+	conf := &api.Config{
+		Address: addr,
+	}
+
+	c, err := api.NewClient(conf)
+	if err != nil {
+		return nil, err
+	}
+
+	c.SetToken(token)
+
+	return &Storage{client: c, path: path}, nil
+}
+
+func (s *Storage) Save(key string, data []byte) error {
+	kv := s.client.KVv1(s.path)
+
+	str := base64.StdEncoding.EncodeToString(data)
+	m := map[string]any{
+		"data": map[string]string{
+			"payload": str,
+		},
+	}
+
+	if err := kv.Put(context.Background(), "testkey", m); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (s *Storage) Load(key string) ([]byte, error) {
+	kv := s.client.KVv1(s.path)
+
+	m, err := kv.Get(context.Background(), key)
+	if err != nil {
+		return nil, err
+	}
+
+	data, ok := m.Data["data"] // map[string]any
+	if !ok {
+		return nil, errors.New("no data found")
+	}
+
+	payloadmap, ok := data.(map[string]any)
+	if !ok {
+		return nil, errors.New("no payload map")
+	}
+
+	rawb, ok := payloadmap["payload"]
+	if !ok {
+		return nil, errors.New("no payload bytes")
+	}
+
+	str, ok := rawb.(string)
+	if !ok {
+		return nil, errors.New("could not convert payload to bytes")
+	}
+
+	b := []byte{}
+
+	b, err = base64.StdEncoding.AppendDecode(b, []byte(str))
+	if err != nil {
+		return nil, err
+	}
+
+	return b, nil
+}
+
+func (s *Storage) Delete(key string) error {
+	kv := s.client.KVv1(s.path)
+
+	if err := kv.Delete(context.Background(), key); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (s *Storage) Close() error {
+	s.client.ClearToken()
+	return nil
+}