feat(drivers): new driver UrlTree (close #3268 in #3933)

* feat(drivers): new driver `urls` (close #3268)

* chore: rename

* support customize basic info or get from url

* dfs tree to calculate folder size

* go mod tidy

* add help message

drivers/url_tree/driver.go

@@ -0,0 +1,79 @@
+package url_tree
+
+import (
+	"context"
+	stdpath "path"
+
+	"github.com/alist-org/alist/v3/internal/driver"
+	"github.com/alist-org/alist/v3/internal/errs"
+	"github.com/alist-org/alist/v3/internal/model"
+	"github.com/alist-org/alist/v3/pkg/utils"
+	log "github.com/sirupsen/logrus"
+)
+
+type Urls struct {
+	model.Storage
+	Addition
+	root *Node
+}
+
+func (d *Urls) Config() driver.Config {
+	return config
+}
+
+func (d *Urls) GetAddition() driver.Additional {
+	return &d.Addition
+}
+
+func (d *Urls) Init(ctx context.Context) error {
+	node, err := BuildTree(d.UrlStructure, d.HeadSize)
+	if err != nil {
+		return err
+	}
+	node.calSize()
+	d.root = node
+	return nil
+}
+
+func (d *Urls) Drop(ctx context.Context) error {
+	return nil
+}
+
+func (d *Urls) Get(ctx context.Context, path string) (model.Obj, error) {
+	node := GetNodeFromRootByPath(d.root, path)
+	return nodeToObj(node, path)
+}
+
+func (d *Urls) List(ctx context.Context, dir model.Obj, args model.ListArgs) ([]model.Obj, error) {
+	node := GetNodeFromRootByPath(d.root, dir.GetPath())
+	log.Debugf("path: %s, node: %+v", dir.GetPath(), node)
+	if node == nil {
+		return nil, errs.ObjectNotFound
+	}
+	if node.isFile() {
+		return nil, errs.NotFolder
+	}
+	return utils.SliceConvert(node.Children, func(node *Node) (model.Obj, error) {
+		return nodeToObj(node, stdpath.Join(dir.GetPath(), node.Name))
+	})
+}
+
+func (d *Urls) Link(ctx context.Context, file model.Obj, args model.LinkArgs) (*model.Link, error) {
+	node := GetNodeFromRootByPath(d.root, file.GetPath())
+	log.Debugf("path: %s, node: %+v", file.GetPath(), node)
+	if node == nil {
+		return nil, errs.ObjectNotFound
+	}
+	if node.isFile() {
+		return &model.Link{
+			URL: node.Url,
+		}, nil
+	}
+	return nil, errs.NotFile
+}
+
+//func (d *Template) Other(ctx context.Context, args model.OtherArgs) (interface{}, error) {
+//	return nil, errs.NotSupport
+//}
+
+var _ driver.Driver = (*Urls)(nil)