XDRIVE transport: Add "s3" storage backend (#7231)

https://github.com/XTLS/Xray-core/pull/7231#issuecomment-6488077212

infra/conf/transport_method.go

@@ -997,12 +997,20 @@ type XDriveConfig struct {
 	EagerWindowMs     uint32          `json:"eagerWindowMs"`
 	HoleTimeoutMs     uint32          `json:"holeTimeoutMs"`
 	Template          json.RawMessage `json:"template"`
+	S3                *XDriveS3Config `json:"s3"`
 	Xmux              XmuxConfig      `json:"xmux"`
 
 	// set by StreamConfig when "alpn" is ["h3"]
 	h3 bool
 }
 
+type XDriveS3Config struct {
+	Endpoint  string `json:"endpoint"`
+	Region    string `json:"region"`
+	Bucket    string `json:"bucket"`
+	PathStyle *bool  `json:"pathStyle"`
+}
+
 // Build implements Buildable.
 func (c *XDriveConfig) Build() (proto.Message, error) {
 	switch c.Service {
@@ -1019,8 +1027,12 @@ func (c *XDriveConfig) Build() (proto.Message, error) {
 		if len(c.Template) == 0 {
 			return nil, errors.New(`service "template" needs a "template" object`)
 		}
+	case "s3":
+		if c.S3 == nil {
+			return nil, errors.New(`service "s3" needs an "s3" object`)
+		}
 	default:
-		return nil, errors.New(`unknown "service": "`, c.Service, `", use "google-drive", "template" or "local"`)
+		return nil, errors.New(`unknown "service": "`, c.Service, `", use "google-drive", "template", "s3" or "local"`)
 	}
 	if c.Xmux.MaxConnections.To > 0 && c.Xmux.MaxConcurrency.To > 0 {
 		return nil, errors.New("maxConnections cannot be specified together with maxConcurrency")
@@ -1059,5 +1071,16 @@ func (c *XDriveConfig) Build() (proto.Message, error) {
 			HKeepAlivePeriod: c.Xmux.HKeepAlivePeriod,
 		},
 	}
+	if c.Service == "s3" {
+		config.S3 = &xdrive.S3Config{
+			Endpoint:  c.S3.Endpoint,
+			Region:    c.S3.Region,
+			Bucket:    c.S3.Bucket,
+			PathStyle: c.S3.PathStyle == nil || *c.S3.PathStyle,
+		}
+		if err := xdrive.ValidateS3Config(config); err != nil {
+			return nil, err
+		}
+	}
 	return config, nil
 }

infra/conf/transport_test.go

@@ -324,7 +324,7 @@ func TestXDriveRejectsUnknownService(t *testing.T) {
 	if err := json.Unmarshal([]byte(`{"remoteFolder": "/tmp/xdrive", "service": "Dropbox"}`), config); err != nil {
 		t.Fatalf("Unmarshal: %v", err)
 	}
-	if _, err := config.Build(); err == nil || !strings.Contains(err.Error(), `use "google-drive", "template" or "local"`) {
+	if _, err := config.Build(); err == nil || !strings.Contains(err.Error(), `use "google-drive", "template", "s3" or "local"`) {
 		t.Fatalf("expected an unknown service error, got %v", err)
 	}
 }