Init V4 community edition (#2265)

* Init V4 community edition

* Init V4 community edition

pkg/filemanager/fs/dbfs/validator.go

@@ -0,0 +1,88 @@
+package dbfs
+
+import (
+	"context"
+	"fmt"
+	"github.com/cloudreve/Cloudreve/v4/ent"
+	"github.com/cloudreve/Cloudreve/v4/pkg/filemanager/fs"
+	"github.com/cloudreve/Cloudreve/v4/pkg/util"
+	"strings"
+)
+
+const MaxFileNameLength = 256
+
+// validateFileName validates the file name.
+func validateFileName(name string) error {
+	if len(name) >= MaxFileNameLength || len(name) == 0 {
+		return fmt.Errorf("length of name must be between 1 and 255")
+	}
+
+	if strings.ContainsAny(name, "\\/:*?\"<>|") {
+		return fmt.Errorf("name contains illegal characters")
+	}
+
+	if name == "." || name == ".." {
+		return fmt.Errorf("name cannot be only dot")
+	}
+
+	return nil
+}
+
+// validateExtension validates the file extension.
+func validateExtension(name string, policy *ent.StoragePolicy) error {
+	// 不需要验证
+	if len(policy.Settings.FileType) == 0 {
+		return nil
+	}
+
+	if !util.IsInExtensionList(policy.Settings.FileType, name) {
+		return fmt.Errorf("file extension is not allowed")
+	}
+
+	return nil
+}
+
+// validateFileSize validates the file size.
+func validateFileSize(size int64, policy *ent.StoragePolicy) error {
+	if policy.MaxSize == 0 {
+		return nil
+	} else if size > policy.MaxSize {
+		return fs.ErrFileSizeTooBig
+	}
+
+	return nil
+}
+
+// validateNewFile validates the upload request.
+func validateNewFile(fileName string, size int64, policy *ent.StoragePolicy) error {
+	if err := validateFileName(fileName); err != nil {
+		return err
+	}
+
+	if err := validateExtension(fileName, policy); err != nil {
+		return err
+	}
+
+	if err := validateFileSize(size, policy); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (f *DBFS) validateUserCapacity(ctx context.Context, size int64, u *ent.User) error {
+	capacity, err := f.Capacity(ctx, u)
+	if err != nil {
+		return fmt.Errorf("failed to get user capacity: %s", err)
+	}
+
+	return f.validateUserCapacityRaw(ctx, size, capacity)
+}
+
+// validateUserCapacityRaw validates the user capacity, but does not fetch the capacity.
+func (f *DBFS) validateUserCapacityRaw(ctx context.Context, size int64, capacity *fs.Capacity) error {
+	if capacity.Used+size > capacity.Total {
+		return fs.ErrInsufficientCapacity
+	}
+	return nil
+}