feat: misc improvements about upload/copy/hash (#5045)

general: add createTime/updateTime support in webdav and some drivers
general: add hash support in some drivers
general: cross-storage rapid-upload support
general: enhance upload to avoid local temp file if possible
general: replace readseekcloser with File interface to speed upstream operations
feat(aliyun_open): same as above
feat(crypt): add hack for 139cloud

Close #4934 
Close #4819 

baidu_netdisk needs to improve the upload code to support rapid-upload

server/webdav/util.go

@@ -0,0 +1,29 @@
+package webdav
+
+import (
+	log "github.com/sirupsen/logrus"
+	"net/http"
+	"strconv"
+	"time"
+)
+
+func (h *Handler) getModTime(r *http.Request) time.Time {
+	return h.getHeaderTime(r, "X-OC-Mtime")
+}
+
+// owncloud/ nextcloud haven't impl this, but we can add the support since rclone may support this soon
+func (h *Handler) getCreateTime(r *http.Request) time.Time {
+	return h.getHeaderTime(r, "X-OC-Ctime")
+}
+
+func (h *Handler) getHeaderTime(r *http.Request, header string) time.Time {
+	hVal := r.Header.Get(header)
+	if hVal != "" {
+		modTimeUnix, err := strconv.ParseInt(hVal, 10, 64)
+		if err == nil {
+			return time.Unix(modTimeUnix, 0)
+		}
+		log.Warnf("getModTime in Webdav, failed to parse %s, %s", header, err)
+	}
+	return time.Now()
+}