feat: docker compose backup

internal/storage/storage.go

@@ -0,0 +1,32 @@
+package storage
+
+import (
+	"context"
+	"fmt"
+
+	"git.misaka.ren/M1saka/docker_backup/internal/config"
+)
+
+// Backend is the interface for uploading backups to remote storage.
+type Backend interface {
+	Upload(ctx context.Context, projectName, localPath string) error
+}
+
+// FromConfig creates storage backends from the config.
+// Returns an error only if a backend is configured but fails to initialize.
+func FromConfig(cfg *config.RemoteConfig) ([]Backend, error) {
+	var backends []Backend
+
+	if cfg.S3 != nil {
+		s3, err := NewS3Backend(cfg.S3)
+		if err != nil {
+			return nil, fmt.Errorf("s3: %w", err)
+		}
+		backends = append(backends, s3)
+	}
+	if cfg.WebDAV != nil {
+		backends = append(backends, NewWebDAVBackend(cfg.WebDAV))
+	}
+
+	return backends, nil
+}