mirror of
https://github.com/rclone/rclone.git
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399 lines
11 KiB
Go
399 lines
11 KiB
Go
// Package restic serves a remote suitable for use with restic
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// +build go1.9
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package restic
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import (
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"encoding/json"
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"errors"
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"net/http"
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"os"
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"path"
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"regexp"
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"strings"
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"time"
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"github.com/ncw/rclone/cmd"
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"github.com/ncw/rclone/cmd/serve/httplib"
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"github.com/ncw/rclone/cmd/serve/httplib/httpflags"
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"github.com/ncw/rclone/cmd/serve/httplib/serve"
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"github.com/ncw/rclone/fs"
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"github.com/ncw/rclone/fs/accounting"
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"github.com/ncw/rclone/fs/fserrors"
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"github.com/ncw/rclone/fs/operations"
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"github.com/ncw/rclone/fs/walk"
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"github.com/spf13/cobra"
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"golang.org/x/crypto/ssh/terminal"
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"golang.org/x/net/http2"
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)
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var (
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stdio bool
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appendOnly bool
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)
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func init() {
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httpflags.AddFlags(Command.Flags())
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Command.Flags().BoolVar(&stdio, "stdio", false, "run an HTTP2 server on stdin/stdout")
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Command.Flags().BoolVar(&appendOnly, "append-only", false, "disallow deletion of repository data")
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}
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// Command definition for cobra
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var Command = &cobra.Command{
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Use: "restic remote:path",
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Short: `Serve the remote for restic's REST API.`,
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Long: `rclone serve restic implements restic's REST backend API
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over HTTP. This allows restic to use rclone as a data storage
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mechanism for cloud providers that restic does not support directly.
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[Restic](https://restic.net/) is a command line program for doing
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backups.
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The server will log errors. Use -v to see access logs.
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--bwlimit will be respected for file transfers. Use --stats to
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control the stats printing.
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### Setting up rclone for use by restic ###
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First [set up a remote for your chosen cloud provider](/docs/#configure).
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Once you have set up the remote, check it is working with, for example
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"rclone lsd remote:". You may have called the remote something other
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than "remote:" - just substitute whatever you called it in the
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following instructions.
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Now start the rclone restic server
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rclone serve restic -v remote:backup
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Where you can replace "backup" in the above by whatever path in the
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remote you wish to use.
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By default this will serve on "localhost:8080" you can change this
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with use of the "--addr" flag.
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You might wish to start this server on boot.
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### Setting up restic to use rclone ###
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Now you can [follow the restic
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instructions](http://restic.readthedocs.io/en/latest/030_preparing_a_new_repo.html#rest-server)
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on setting up restic.
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Note that you will need restic 0.8.2 or later to interoperate with
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rclone.
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For the example above you will want to use "http://localhost:8080/" as
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the URL for the REST server.
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For example:
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$ export RESTIC_REPOSITORY=rest:http://localhost:8080/
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$ export RESTIC_PASSWORD=yourpassword
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$ restic init
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created restic backend 8b1a4b56ae at rest:http://localhost:8080/
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Please note that knowledge of your password is required to access
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the repository. Losing your password means that your data is
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irrecoverably lost.
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$ restic backup /path/to/files/to/backup
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scan [/path/to/files/to/backup]
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scanned 189 directories, 312 files in 0:00
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[0:00] 100.00% 38.128 MiB / 38.128 MiB 501 / 501 items 0 errors ETA 0:00
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duration: 0:00
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snapshot 45c8fdd8 saved
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#### Multiple repositories ####
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Note that you can use the endpoint to host multiple repositories. Do
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this by adding a directory name or path after the URL. Note that
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these **must** end with /. Eg
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$ export RESTIC_REPOSITORY=rest:http://localhost:8080/user1repo/
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# backup user1 stuff
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$ export RESTIC_REPOSITORY=rest:http://localhost:8080/user2repo/
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# backup user2 stuff
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` + httplib.Help,
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Run: func(command *cobra.Command, args []string) {
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cmd.CheckArgs(1, 1, command, args)
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f := cmd.NewFsSrc(args)
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cmd.Run(false, true, command, func() error {
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s := newServer(f, &httpflags.Opt)
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if stdio {
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if terminal.IsTerminal(int(os.Stdout.Fd())) {
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return errors.New("Refusing to run HTTP2 server directly on a terminal, please let restic start rclone")
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}
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conn := &StdioConn{
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stdin: os.Stdin,
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stdout: os.Stdout,
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}
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httpSrv := &http2.Server{}
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opts := &http2.ServeConnOpts{
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Handler: http.HandlerFunc(s.handler),
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}
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httpSrv.ServeConn(conn, opts)
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return nil
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}
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err := s.Serve()
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if err != nil {
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return err
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}
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s.Wait()
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return nil
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})
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},
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}
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const (
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resticAPIV2 = "application/vnd.x.restic.rest.v2"
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)
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// server contains everything to run the server
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type server struct {
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*httplib.Server
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f fs.Fs
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}
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func newServer(f fs.Fs, opt *httplib.Options) *server {
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mux := http.NewServeMux()
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s := &server{
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Server: httplib.NewServer(mux, opt),
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f: f,
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}
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mux.HandleFunc("/", s.handler)
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return s
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}
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// Serve runs the http server in the background.
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//
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// Use s.Close() and s.Wait() to shutdown server
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func (s *server) Serve() error {
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err := s.Server.Serve()
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if err != nil {
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return err
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}
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fs.Logf(s.f, "Serving restic REST API on %s", s.URL())
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return nil
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}
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var matchData = regexp.MustCompile("(?:^|/)data/([^/]{2,})$")
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// Makes a remote from a URL path. This implements the backend layout
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// required by restic.
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func makeRemote(path string) string {
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path = strings.Trim(path, "/")
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parts := matchData.FindStringSubmatch(path)
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// if no data directory, layout is flat
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if parts == nil {
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return path
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}
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// otherwise map
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// data/2159dd48 to
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// data/21/2159dd48
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fileName := parts[1]
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prefix := path[:len(path)-len(fileName)]
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return prefix + fileName[:2] + "/" + fileName
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}
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// handler reads incoming requests and dispatches them
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func (s *server) handler(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Accept-Ranges", "bytes")
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w.Header().Set("Server", "rclone/"+fs.Version)
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path := r.URL.Path
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remote := makeRemote(path)
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fs.Debugf(s.f, "%s %s", r.Method, path)
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// Dispatch on path then method
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if strings.HasSuffix(path, "/") {
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switch r.Method {
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case "GET":
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s.listObjects(w, r, remote)
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case "POST":
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s.createRepo(w, r, remote)
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default:
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http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
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}
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} else {
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switch r.Method {
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case "GET", "HEAD":
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s.serveObject(w, r, remote)
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case "POST":
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s.postObject(w, r, remote)
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case "DELETE":
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s.deleteObject(w, r, remote)
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default:
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http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
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}
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}
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}
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// get the remote
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func (s *server) serveObject(w http.ResponseWriter, r *http.Request, remote string) {
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o, err := s.f.NewObject(remote)
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if err != nil {
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fs.Debugf(remote, "%s request error: %v", r.Method, err)
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http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
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return
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}
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serve.Object(w, r, o)
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}
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// postObject posts an object to the repository
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func (s *server) postObject(w http.ResponseWriter, r *http.Request, remote string) {
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if appendOnly {
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// make sure the file does not exist yet
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_, err := s.f.NewObject(remote)
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if err == nil {
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fs.Errorf(remote, "Post request: file already exists, refusing to overwrite in append-only mode")
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http.Error(w, http.StatusText(http.StatusForbidden), http.StatusForbidden)
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return
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}
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}
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_, err := operations.RcatSize(s.f, remote, r.Body, r.ContentLength, time.Now())
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if err != nil {
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accounting.Stats.Error(err)
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fs.Errorf(remote, "Post request rcat error: %v", err)
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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}
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// delete the remote
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func (s *server) deleteObject(w http.ResponseWriter, r *http.Request, remote string) {
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if appendOnly {
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parts := strings.Split(r.URL.Path, "/")
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// if path doesn't end in "/locks/:name", disallow the operation
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if len(parts) < 2 || parts[len(parts)-2] != "locks" {
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http.Error(w, http.StatusText(http.StatusForbidden), http.StatusForbidden)
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return
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}
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}
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o, err := s.f.NewObject(remote)
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if err != nil {
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fs.Debugf(remote, "Delete request error: %v", err)
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http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
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return
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}
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if err := o.Remove(); err != nil {
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fs.Errorf(remote, "Delete request remove error: %v", err)
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if err == fs.ErrorObjectNotFound {
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http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
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} else {
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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}
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return
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}
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}
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// listItem is an element returned for the restic v2 list response
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type listItem struct {
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Name string `json:"name"`
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Size int64 `json:"size"`
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}
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// return type for list
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type listItems []listItem
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// add a DirEntry to the listItems
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func (ls *listItems) add(entry fs.DirEntry) {
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if o, ok := entry.(fs.Object); ok {
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*ls = append(*ls, listItem{
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Name: path.Base(o.Remote()),
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Size: o.Size(),
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})
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}
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}
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// listObjects lists all Objects of a given type in an arbitrary order.
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func (s *server) listObjects(w http.ResponseWriter, r *http.Request, remote string) {
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fs.Debugf(remote, "list request")
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if r.Header.Get("Accept") != resticAPIV2 {
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fs.Errorf(remote, "Restic v2 API required")
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http.Error(w, "Restic v2 API required", http.StatusBadRequest)
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return
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}
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// make sure an empty list is returned, and not a 'nil' value
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ls := listItems{}
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// if remote supports ListR use that directly, otherwise use recursive Walk
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var err error
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if ListR := s.f.Features().ListR; ListR != nil {
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err = ListR(remote, func(entries fs.DirEntries) error {
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for _, entry := range entries {
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ls.add(entry)
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}
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return nil
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})
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} else {
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err = walk.Walk(s.f, remote, true, -1, func(path string, entries fs.DirEntries, err error) error {
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if err == nil {
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for _, entry := range entries {
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ls.add(entry)
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}
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}
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return err
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})
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}
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if err != nil {
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_, err = fserrors.Cause(err)
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if err != fs.ErrorDirNotFound {
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fs.Errorf(remote, "list failed: %#v %T", err, err)
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http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
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return
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}
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}
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w.Header().Set("Content-Type", "application/vnd.x.restic.rest.v2")
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enc := json.NewEncoder(w)
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err = enc.Encode(ls)
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if err != nil {
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fs.Errorf(remote, "failed to write list: %v", err)
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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}
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// createRepo creates repository directories.
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//
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// We don't bother creating the data dirs as rclone will create them on the fly
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func (s *server) createRepo(w http.ResponseWriter, r *http.Request, remote string) {
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fs.Infof(remote, "Creating repository")
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if r.URL.Query().Get("create") != "true" {
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http.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
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return
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}
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err := s.f.Mkdir(remote)
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if err != nil {
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fs.Errorf(remote, "Create repo failed to Mkdir: %v", err)
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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for _, name := range []string{"data", "index", "keys", "locks", "snapshots"} {
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dirRemote := path.Join(remote, name)
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err := s.f.Mkdir(dirRemote)
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if err != nil {
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fs.Errorf(dirRemote, "Create repo failed to Mkdir: %v", err)
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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}
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}
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