mirror of
https://github.com/rclone/rclone.git
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369 lines
11 KiB
Go
369 lines
11 KiB
Go
// Package rcserver implements the HTTP endpoint to serve the remote control
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package rcserver
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import (
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"encoding/base64"
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"encoding/json"
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"flag"
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"fmt"
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"log"
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"mime"
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"net/http"
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"net/url"
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"path/filepath"
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"regexp"
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"sort"
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"strings"
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"github.com/pkg/errors"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/skratchdot/open-golang/open"
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"github.com/rclone/rclone/cmd/serve/httplib"
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"github.com/rclone/rclone/cmd/serve/httplib/serve"
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/fs/accounting"
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"github.com/rclone/rclone/fs/cache"
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"github.com/rclone/rclone/fs/config"
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"github.com/rclone/rclone/fs/list"
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"github.com/rclone/rclone/fs/rc"
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"github.com/rclone/rclone/fs/rc/jobs"
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"github.com/rclone/rclone/fs/rc/rcflags"
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"github.com/rclone/rclone/lib/random"
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)
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var promHandler http.Handler
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func init() {
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rcloneCollector := accounting.NewRcloneCollector()
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prometheus.MustRegister(rcloneCollector)
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promHandler = promhttp.Handler()
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}
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// Start the remote control server if configured
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//
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// If the server wasn't configured the *Server returned may be nil
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func Start(opt *rc.Options) (*Server, error) {
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jobs.SetOpt(opt) // set the defaults for jobs
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if opt.Enabled {
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// Serve on the DefaultServeMux so can have global registrations appear
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s := newServer(opt, http.DefaultServeMux)
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return s, s.Serve()
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}
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return nil, nil
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}
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// Server contains everything to run the rc server
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type Server struct {
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*httplib.Server
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files http.Handler
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opt *rc.Options
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}
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func newServer(opt *rc.Options, mux *http.ServeMux) *Server {
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s := &Server{
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Server: httplib.NewServer(mux, &opt.HTTPOptions),
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opt: opt,
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}
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mux.HandleFunc("/", s.handler)
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// Add some more mime types which are often missing
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_ = mime.AddExtensionType(".wasm", "application/wasm")
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_ = mime.AddExtensionType(".js", "application/javascript")
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cachePath := filepath.Join(config.CacheDir, "webgui")
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extractPath := filepath.Join(cachePath, "current/build")
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// File handling
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if opt.Files != "" {
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if opt.WebUI {
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fs.Logf(nil, "--rc-files overrides --rc-web-gui command\n")
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}
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fs.Logf(nil, "Serving files from %q", opt.Files)
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s.files = http.FileServer(http.Dir(opt.Files))
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} else if opt.WebUI {
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if err := rc.CheckAndDownloadWebGUIRelease(opt.WebGUIUpdate, opt.WebGUIForceUpdate, opt.WebGUIFetchURL, config.CacheDir); err != nil {
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log.Fatalf("Error while fetching the latest release of Web GUI: %v", err)
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}
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if opt.NoAuth {
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opt.NoAuth = false
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fs.Infof(nil, "Cannot run Web GUI without authentication, using default auth")
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}
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if opt.HTTPOptions.BasicUser == "" {
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opt.HTTPOptions.BasicUser = "gui"
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fs.Infof(nil, "No username specified. Using default username: %s \n", rcflags.Opt.HTTPOptions.BasicUser)
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}
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if opt.HTTPOptions.BasicPass == "" {
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randomPass, err := random.Password(128)
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if err != nil {
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log.Fatalf("Failed to make password: %v", err)
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}
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opt.HTTPOptions.BasicPass = randomPass
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fs.Infof(nil, "No password specified. Using random password: %s \n", randomPass)
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}
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opt.Serve = true
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fs.Logf(nil, "Serving Web GUI")
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s.files = http.FileServer(http.Dir(extractPath))
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}
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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(nil, "Serving remote control on %s", s.URL())
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// Open the files in the browser if set
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if s.files != nil {
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openURL, err := url.Parse(s.URL())
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if err != nil {
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return errors.Wrap(err, "invalid serving URL")
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}
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// Add username, password into the URL if they are set
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user, pass := s.opt.HTTPOptions.BasicUser, s.opt.HTTPOptions.BasicPass
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if user != "" && pass != "" {
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openURL.User = url.UserPassword(user, pass)
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// Base64 encode username and password to be sent through url
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loginToken := user + ":" + pass
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parameters := url.Values{}
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encodedToken := base64.URLEncoding.EncodeToString([]byte(loginToken))
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fs.Debugf(nil, "login_token %q", encodedToken)
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parameters.Add("login_token", encodedToken)
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openURL.RawQuery = parameters.Encode()
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openURL.RawPath = "/#/login"
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}
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// Don't open browser if serving in testing environment or required not to do so.
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if flag.Lookup("test.v") == nil && !s.opt.WebGUINoOpenBrowser {
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if err := open.Start(openURL.String()); err != nil {
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fs.Errorf(nil, "Failed to open Web GUI in browser: %v. Manually access it at: %s", err, openURL.String())
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}
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} else {
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fs.Logf(nil, "Web GUI is not automatically opening browser. Navigate to %s to use.", openURL.String())
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}
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}
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return nil
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}
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// writeError writes a formatted error to the output
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func writeError(path string, in rc.Params, w http.ResponseWriter, err error, status int) {
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fs.Errorf(nil, "rc: %q: error: %v", path, err)
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// Adjust the error return for some well known errors
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errOrig := errors.Cause(err)
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switch {
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case errOrig == fs.ErrorDirNotFound || errOrig == fs.ErrorObjectNotFound:
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status = http.StatusNotFound
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case rc.IsErrParamInvalid(err) || rc.IsErrParamNotFound(err):
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status = http.StatusBadRequest
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}
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w.WriteHeader(status)
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err = rc.WriteJSON(w, rc.Params{
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"status": status,
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"error": err.Error(),
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"input": in,
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"path": path,
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})
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if err != nil {
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// can't return the error at this point
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fs.Errorf(nil, "rc: failed to write JSON output: %v", err)
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}
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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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urlPath, ok := s.Path(w, r)
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if !ok {
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return
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}
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path := strings.TrimLeft(urlPath, "/")
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allowOrigin := rcflags.Opt.AccessControlAllowOrigin
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if allowOrigin != "" {
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if allowOrigin == "*" {
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fs.Logf(nil, "Warning: Allow origin set to *. This can cause serious security problems.")
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}
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w.Header().Add("Access-Control-Allow-Origin", allowOrigin)
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} else {
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w.Header().Add("Access-Control-Allow-Origin", s.URL())
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}
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// echo back access control headers client needs
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//reqAccessHeaders := r.Header.Get("Access-Control-Request-Headers")
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w.Header().Add("Access-Control-Request-Method", "POST, OPTIONS, GET, HEAD")
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w.Header().Add("Access-Control-Allow-Headers", "authorization, Content-Type")
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switch r.Method {
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case "POST":
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s.handlePost(w, r, path)
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case "OPTIONS":
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s.handleOptions(w, r, path)
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case "GET", "HEAD":
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s.handleGet(w, r, path)
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default:
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writeError(path, nil, w, errors.Errorf("method %q not allowed", r.Method), http.StatusMethodNotAllowed)
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return
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}
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}
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func (s *Server) handlePost(w http.ResponseWriter, r *http.Request, path string) {
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contentType := r.Header.Get("Content-Type")
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values := r.URL.Query()
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if contentType == "application/x-www-form-urlencoded" {
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// Parse the POST and URL parameters into r.Form, for others r.Form will be empty value
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err := r.ParseForm()
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if err != nil {
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writeError(path, nil, w, errors.Wrap(err, "failed to parse form/URL parameters"), http.StatusBadRequest)
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return
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}
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values = r.Form
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}
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// Read the POST and URL parameters into in
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in := make(rc.Params)
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for k, vs := range values {
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if len(vs) > 0 {
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in[k] = vs[len(vs)-1]
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}
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}
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// Parse a JSON blob from the input
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if contentType == "application/json" {
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err := json.NewDecoder(r.Body).Decode(&in)
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if err != nil {
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writeError(path, in, w, errors.Wrap(err, "failed to read input JSON"), http.StatusBadRequest)
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return
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}
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}
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// Find the call
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call := rc.Calls.Get(path)
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if call == nil {
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writeError(path, in, w, errors.Errorf("couldn't find method %q", path), http.StatusNotFound)
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return
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}
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// Check to see if it requires authorisation
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if !s.opt.NoAuth && call.AuthRequired && !s.UsingAuth() {
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writeError(path, in, w, errors.Errorf("authentication must be set up on the rc server to use %q or the --rc-no-auth flag must be in use", path), http.StatusForbidden)
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return
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}
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// Check to see if it is async or not
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isAsync, err := in.GetBool("_async")
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if rc.NotErrParamNotFound(err) {
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writeError(path, in, w, err, http.StatusBadRequest)
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return
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}
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delete(in, "_async") // remove the async parameter after parsing so vfs operations don't get confused
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fs.Debugf(nil, "rc: %q: with parameters %+v", path, in)
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var out rc.Params
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if isAsync {
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out, err = jobs.StartAsyncJob(call.Fn, in)
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} else {
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var jobID int64
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out, jobID, err = jobs.ExecuteJob(r.Context(), call.Fn, in)
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w.Header().Add("x-rclone-jobid", fmt.Sprintf("%d", jobID))
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}
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if err != nil {
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writeError(path, in, w, err, http.StatusInternalServerError)
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return
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}
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if out == nil {
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out = make(rc.Params)
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}
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fs.Debugf(nil, "rc: %q: reply %+v: %v", path, out, err)
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err = rc.WriteJSON(w, out)
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if err != nil {
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// can't return the error at this point - but have a go anyway
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writeError(path, in, w, err, http.StatusInternalServerError)
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fs.Errorf(nil, "rc: failed to write JSON output: %v", err)
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}
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}
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func (s *Server) handleOptions(w http.ResponseWriter, r *http.Request, path string) {
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w.WriteHeader(http.StatusOK)
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}
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func (s *Server) serveRoot(w http.ResponseWriter, r *http.Request) {
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remotes := config.FileSections()
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sort.Strings(remotes)
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directory := serve.NewDirectory("", s.HTMLTemplate)
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directory.Title = "List of all rclone remotes."
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q := url.Values{}
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for _, remote := range remotes {
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q.Set("fs", remote)
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directory.AddEntry("["+remote+":]", true)
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}
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directory.Serve(w, r)
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}
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func (s *Server) serveRemote(w http.ResponseWriter, r *http.Request, path string, fsName string) {
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f, err := cache.Get(fsName)
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if err != nil {
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writeError(path, nil, w, errors.Wrap(err, "failed to make Fs"), http.StatusInternalServerError)
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return
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}
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if path == "" || strings.HasSuffix(path, "/") {
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path = strings.Trim(path, "/")
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entries, err := list.DirSorted(r.Context(), f, false, path)
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if err != nil {
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writeError(path, nil, w, errors.Wrap(err, "failed to list directory"), http.StatusInternalServerError)
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return
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}
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// Make the entries for display
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directory := serve.NewDirectory(path, s.HTMLTemplate)
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for _, entry := range entries {
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_, isDir := entry.(fs.Directory)
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directory.AddEntry(entry.Remote(), isDir)
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}
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directory.Serve(w, r)
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} else {
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path = strings.Trim(path, "/")
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o, err := f.NewObject(r.Context(), path)
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if err != nil {
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writeError(path, nil, w, errors.Wrap(err, "failed to find object"), http.StatusInternalServerError)
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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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}
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// Match URLS of the form [fs]/remote
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var fsMatch = regexp.MustCompile(`^\[(.*?)\](.*)$`)
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func (s *Server) handleGet(w http.ResponseWriter, r *http.Request, path string) {
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// Look to see if this has an fs in the path
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match := fsMatch.FindStringSubmatch(path)
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switch {
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case match != nil && s.opt.Serve:
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// Serve /[fs]/remote files
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s.serveRemote(w, r, match[2], match[1])
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return
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case path == "metrics" && s.opt.EnableMetrics:
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promHandler.ServeHTTP(w, r)
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return
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case path == "*" && s.opt.Serve:
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// Serve /* as the remote listing
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s.serveRoot(w, r)
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return
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case s.files != nil:
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// Serve the files
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r.URL.Path = "/" + path
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s.files.ServeHTTP(w, r)
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return
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case path == "" && s.opt.Serve:
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// Serve the root as a remote listing
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s.serveRoot(w, r)
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return
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}
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http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
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}
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