Add basic implementation of WebDAV Folder expose

Signed-off-by: Knut Ahlers <knut@ahlers.me>

cmd/webdav.go

@@ -0,0 +1,86 @@
+package cmd
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"os"
+	"os/signal"
+
+	"golang.org/x/net/webdav"
+
+	"github.com/Luzifer/expose/ngrok2"
+	http_helper "github.com/Luzifer/go_helpers/http"
+	"github.com/spf13/cobra"
+)
+
+// webdavCmd represents the serve command
+var webdavCmd = &cobra.Command{
+	Use:   "webdav",
+	Short: "Exposes the current directory using WebDAV",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		listener, err := net.Listen("tcp", "127.0.0.1:0")
+		if err != nil {
+			return fmt.Errorf("Unable to bind local HTTP server: %s", err)
+		}
+
+		_, port, err := net.SplitHostPort(listener.Addr().String())
+		if err != nil {
+			return fmt.Errorf("Unable to determine bound port: %s", err)
+		}
+
+		name := fmt.Sprintf("expose_%s", port)
+		if tun, err := client.GetTunnelByName(name); err == nil {
+			return fmt.Errorf("Address %q already has an active tunnel with URL %s", tun.Config.Addr, tun.PublicURL)
+		}
+
+		tun, err := client.CreateTunnel(ngrok2.CreateTunnelInput{
+			Name:    name,
+			Addr:    port,
+			Proto:   "http",
+			BindTLS: "true",
+			Inspect: false,
+		})
+
+		if err != nil {
+			return fmt.Errorf("Unable to create tunnel: %s", err)
+		}
+
+		srv := &webdav.Handler{
+			Prefix:     "/",
+			FileSystem: webdav.Dir("."),
+			LockSystem: webdav.NewMemLS(),
+		}
+
+		logging := http_helper.NewHTTPLogHandler(srv)
+
+		go http.Serve(listener, logging)
+		fmt.Printf("Created HTTP server for this directory with URL %s\nPress Ctrl+C to stop server and tunnel", tun.PublicURL)
+
+		c := make(chan os.Signal, 1)
+		signal.Notify(c, os.Interrupt)
+		for range c {
+			if err := client.StopTunnel(tun.Name); err != nil {
+				return fmt.Errorf("Unable to stop tunnel %q: %s", tun.Name, err)
+			}
+			fmt.Printf("\nSuccessfully stopped server and tunnel.\n")
+			return nil
+		}
+
+		return nil
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(webdavCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// webdavCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	// webdavCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}