first alpha version cli

pkg/remote/remote.go

@@ -0,0 +1,91 @@
+package remote
+
+import (
+	"cloudsave/pkg/game"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+type (
+	Remote struct {
+		URL    string `json:"url"`
+		GameID string `json:"-"`
+	}
+)
+
+var (
+	roaming       string
+	datastorepath string
+)
+
+func init() {
+	var err error
+	roaming, err = os.UserConfigDir()
+	if err != nil {
+		panic("failed to get user config path: " + err.Error())
+	}
+
+	datastorepath = filepath.Join(roaming, "cloudsave", "data")
+	err = os.MkdirAll(datastorepath, 0740)
+	if err != nil {
+		panic("cannot make the datastore:" + err.Error())
+	}
+}
+
+func All() ([]Remote, error) {
+	ds, err := os.ReadDir(datastorepath)
+	if err != nil {
+		return nil, fmt.Errorf("cannot open the datastore: %w", err)
+	}
+
+	var remotes []Remote
+	for _, d := range ds {
+		content, err := os.ReadFile(filepath.Join(datastorepath, d.Name(), "remote.json"))
+		if err != nil {
+			continue
+		}
+
+		var r Remote
+		err = json.Unmarshal(content, &r)
+		if err != nil {
+			return nil, fmt.Errorf("corrupted datastore: failed to parse %s/remote.json: %w", d.Name(), err)
+		}
+
+		content, err = os.ReadFile(filepath.Join(datastorepath, d.Name(), "metadata.json"))
+		if err != nil {
+			return nil, fmt.Errorf("corrupted datastore: failed to read %s/metadata.json: %w", d.Name(), err)
+		}
+
+		var m game.Metadata
+		err = json.Unmarshal(content, &m)
+		if err != nil {
+			return nil, fmt.Errorf("corrupted datastore: failed to parse %s/metadata.json: %w", d.Name(), err)
+		}
+
+		r.GameID = m.ID
+		remotes = append(remotes, r)
+	}
+	return remotes, nil
+}
+
+func Set(gameID, url string) error {
+	r := Remote{
+		URL: url,
+	}
+
+	f, err := os.OpenFile(filepath.Join(datastorepath, gameID, "remote.json"), os.O_WRONLY|os.O_CREATE, 0740)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	e := json.NewEncoder(f)
+	err = e.Encode(r)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}