271 lines
6.9 KiB
Go
271 lines
6.9 KiB
Go
// Package http provides common functionality for http servers
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package http
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import (
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"context"
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"fmt"
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"io"
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"log"
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"net/http"
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"os"
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"path"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/go-chi/chi/v5/middleware"
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"github.com/rclone/rclone/cmd"
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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/lib/atexit"
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libhttp "github.com/rclone/rclone/lib/http"
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"github.com/rclone/rclone/lib/http/serve"
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"github.com/rclone/rclone/vfs"
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"github.com/rclone/rclone/vfs/vfsflags"
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"github.com/spf13/cobra"
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)
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// Options required for http server
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type Options struct {
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Auth libhttp.AuthConfig
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HTTP libhttp.Config
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Template libhttp.TemplateConfig
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}
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// DefaultOpt is the default values used for Options
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var DefaultOpt = Options{
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Auth: libhttp.DefaultAuthCfg(),
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HTTP: libhttp.DefaultCfg(),
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Template: libhttp.DefaultTemplateCfg(),
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}
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// Opt is options set by command line flags
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var Opt = DefaultOpt
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func init() {
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flagSet := Command.Flags()
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libhttp.AddAuthFlagsPrefix(flagSet, "", &Opt.Auth)
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libhttp.AddHTTPFlagsPrefix(flagSet, "", &Opt.HTTP)
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libhttp.AddTemplateFlagsPrefix(flagSet, "", &Opt.Template)
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vfsflags.AddFlags(flagSet)
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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: "http remote:path",
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Short: `Serve the remote over HTTP.`,
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Long: `Run a basic web server to serve a remote over HTTP.
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This can be viewed in a web browser or you can make a remote of type
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http read from it.
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You can use the filter flags (e.g. ` + "`--include`, `--exclude`" + `) to control what
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is served.
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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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` + libhttp.Help + libhttp.TemplateHelp + libhttp.AuthHelp + vfs.Help,
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Annotations: map[string]string{
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"versionIntroduced": "v1.39",
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},
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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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ctx := context.Background()
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s, err := run(ctx, f, Opt)
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if err != nil {
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log.Fatal(err)
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}
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var finaliseOnce sync.Once
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finalise := func() {
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finaliseOnce.Do(func() {
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if err := s.server.Shutdown(); err != nil {
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log.Printf("error shutting down server: %v", err)
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}
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})
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}
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fnHandle := atexit.Register(finalise)
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defer atexit.Unregister(fnHandle)
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s.server.Wait()
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return nil
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})
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},
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}
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// server contains everything to run the server
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type serveCmd struct {
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f fs.Fs
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vfs *vfs.VFS
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server *libhttp.Server
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}
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func run(ctx context.Context, f fs.Fs, opt Options) (*serveCmd, error) {
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var err error
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s := &serveCmd{
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f: f,
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vfs: vfs.New(f, &vfsflags.Opt),
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}
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s.server, err = libhttp.NewServer(ctx,
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libhttp.WithConfig(opt.HTTP),
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libhttp.WithAuth(opt.Auth),
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libhttp.WithTemplate(opt.Template),
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)
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if err != nil {
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return nil, fmt.Errorf("failed to init server: %w", err)
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}
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router := s.server.Router()
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router.Use(
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middleware.SetHeader("Accept-Ranges", "bytes"),
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middleware.SetHeader("Server", "rclone/"+fs.Version),
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)
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router.Get("/*", s.handler)
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router.Head("/*", s.handler)
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s.server.Serve()
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return s, nil
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}
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// handler reads incoming requests and dispatches them
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func (s *serveCmd) handler(w http.ResponseWriter, r *http.Request) {
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isDir := strings.HasSuffix(r.URL.Path, "/")
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remote := strings.Trim(r.URL.Path, "/")
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if isDir {
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s.serveDir(w, r, remote)
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} else {
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s.serveFile(w, r, remote)
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}
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}
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// serveDir serves a directory index at dirRemote
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func (s *serveCmd) serveDir(w http.ResponseWriter, r *http.Request, dirRemote string) {
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// List the directory
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node, err := s.vfs.Stat(dirRemote)
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if err == vfs.ENOENT {
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http.Error(w, "Directory not found", http.StatusNotFound)
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return
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} else if err != nil {
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serve.Error(dirRemote, w, "Failed to list directory", err)
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return
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}
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if !node.IsDir() {
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http.Error(w, "Not a directory", http.StatusNotFound)
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return
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}
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dir := node.(*vfs.Dir)
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dirEntries, err := dir.ReadDirAll()
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if err != nil {
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serve.Error(dirRemote, w, "Failed to list directory", err)
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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(dirRemote, s.server.HTMLTemplate())
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for _, node := range dirEntries {
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if vfsflags.Opt.NoModTime {
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directory.AddHTMLEntry(node.Path(), node.IsDir(), node.Size(), time.Time{})
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} else {
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directory.AddHTMLEntry(node.Path(), node.IsDir(), node.Size(), node.ModTime().UTC())
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}
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}
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sortParm := r.URL.Query().Get("sort")
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orderParm := r.URL.Query().Get("order")
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directory.ProcessQueryParams(sortParm, orderParm)
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// Set the Last-Modified header to the timestamp
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w.Header().Set("Last-Modified", dir.ModTime().UTC().Format(http.TimeFormat))
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directory.Serve(w, r)
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}
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// serveFile serves a file object at remote
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func (s *serveCmd) serveFile(w http.ResponseWriter, r *http.Request, remote string) {
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node, err := s.vfs.Stat(remote)
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if err == vfs.ENOENT {
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fs.Infof(remote, "%s: File not found", r.RemoteAddr)
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http.Error(w, "File not found", http.StatusNotFound)
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return
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} else if err != nil {
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serve.Error(remote, w, "Failed to find file", err)
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return
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}
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if !node.IsFile() {
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http.Error(w, "Not a file", http.StatusNotFound)
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return
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}
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entry := node.DirEntry()
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if entry == nil {
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http.Error(w, "Can't open file being written", http.StatusNotFound)
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return
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}
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obj := entry.(fs.Object)
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file := node.(*vfs.File)
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// Set content length if we know how long the object is
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knownSize := obj.Size() >= 0
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if knownSize {
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w.Header().Set("Content-Length", strconv.FormatInt(node.Size(), 10))
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}
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// Set content type
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mimeType := fs.MimeType(r.Context(), obj)
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if mimeType == "application/octet-stream" && path.Ext(remote) == "" {
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// Leave header blank so http server guesses
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} else {
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w.Header().Set("Content-Type", mimeType)
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}
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// Set the Last-Modified header to the timestamp
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w.Header().Set("Last-Modified", file.ModTime().UTC().Format(http.TimeFormat))
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// If HEAD no need to read the object since we have set the headers
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if r.Method == "HEAD" {
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return
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}
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// open the object
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in, err := file.Open(os.O_RDONLY)
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if err != nil {
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serve.Error(remote, w, "Failed to open file", err)
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return
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}
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defer func() {
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err := in.Close()
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if err != nil {
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fs.Errorf(remote, "Failed to close file: %v", err)
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}
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}()
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// Account the transfer
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tr := accounting.Stats(r.Context()).NewTransfer(obj)
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defer tr.Done(r.Context(), nil)
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// FIXME in = fs.NewAccount(in, obj).WithBuffer() // account the transfer
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// Serve the file
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if knownSize {
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http.ServeContent(w, r, remote, node.ModTime(), in)
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} else {
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// http.ServeContent can't serve unknown length files
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if rangeRequest := r.Header.Get("Range"); rangeRequest != "" {
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http.Error(w, "Can't use Range: on files of unknown length", http.StatusRequestedRangeNotSatisfiable)
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return
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}
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n, err := io.Copy(w, in)
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if err != nil {
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fs.Errorf(obj, "Didn't finish writing GET request (wrote %d/unknown bytes): %v", n, err)
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return
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}
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}
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}
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