541 lines
14 KiB
Go
541 lines
14 KiB
Go
// Package yandex provides an interface to the Yandex Disk storage.
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//
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// dibu28 <dibu28@gmail.com> github.com/dibu28
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package yandex
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import (
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"encoding/json"
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"fmt"
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"io"
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"log"
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"path"
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"path/filepath"
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"strings"
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"time"
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"github.com/ncw/rclone/fs"
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"github.com/ncw/rclone/oauthutil"
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yandex "github.com/ncw/rclone/yandex/api"
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"golang.org/x/oauth2"
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)
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//oAuth
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const (
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rcloneClientID = "ac39b43b9eba4cae8ffb788c06d816a8"
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rcloneClientSecret = "k8jKzZnMmM+Wx5jAksPAwYKPgImOiN+FhNKD09KBg9A="
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)
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// Globals
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var (
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// Description of how to auth for this app
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oauthConfig = &oauth2.Config{
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Endpoint: oauth2.Endpoint{
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AuthURL: "https://oauth.yandex.com/authorize", //same as https://oauth.yandex.ru/authorize
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TokenURL: "https://oauth.yandex.com/token", //same as https://oauth.yandex.ru/token
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},
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ClientID: rcloneClientID,
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ClientSecret: fs.Reveal(rcloneClientSecret),
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RedirectURL: oauthutil.RedirectURL,
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}
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)
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// Register with Fs
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func init() {
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fs.Register(&fs.Info{
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Name: "yandex",
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NewFs: NewFs,
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Config: func(name string) {
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err := oauthutil.Config(name, oauthConfig)
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if err != nil {
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log.Fatalf("Failed to configure token: %v", err)
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}
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},
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Options: []fs.Option{{
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Name: oauthutil.ConfigClientID,
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Help: "Yandex Client Id - leave blank normally.",
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}, {
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Name: oauthutil.ConfigClientSecret,
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Help: "Yandex Client Secret - leave blank normally.",
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}},
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})
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}
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// Fs represents a remote yandex
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type Fs struct {
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name string
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yd *yandex.Client // client for rest api
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root string //root path
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diskRoot string //root path with "disk:/" container name
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mkdircache map[string]int
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}
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// Object describes a swift object
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type Object struct {
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fs *Fs // what this object is part of
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remote string // The remote path
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md5sum string // The MD5Sum of the object
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bytes uint64 // Bytes in the object
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modTime time.Time // Modified time of the object
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}
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// ------------------------------------------------------------
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// Name of the remote (as passed into NewFs)
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func (f *Fs) Name() string {
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return f.name
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}
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// Root of the remote (as passed into NewFs)
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func (f *Fs) Root() string {
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return f.root
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}
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// String converts this Fs to a string
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func (f *Fs) String() string {
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return fmt.Sprintf("Yandex %s", f.root)
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}
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// read access token from ConfigFile string
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func getAccessToken(name string) (*oauth2.Token, error) {
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// Read the token from the config file
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tokenConfig := fs.ConfigFile.MustValue(name, "token")
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//Get access token from config string
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decoder := json.NewDecoder(strings.NewReader(tokenConfig))
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var result *oauth2.Token
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err := decoder.Decode(&result)
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if err != nil {
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return nil, err
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}
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return result, nil
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}
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// NewFs constructs an Fs from the path, container:path
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func NewFs(name, root string) (fs.Fs, error) {
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//read access token from config
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token, err := getAccessToken(name)
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if err != nil {
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return nil, err
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}
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//create new client
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yandexDisk := yandex.NewClient(token.AccessToken)
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f := &Fs{
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yd: yandexDisk,
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}
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f.setRoot(root)
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//limited fs
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// Check to see if the object exists and is a file
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//request object meta info
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var opt2 yandex.ResourceInfoRequestOptions
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if ResourceInfoResponse, err := yandexDisk.NewResourceInfoRequest(root, opt2).Exec(); err != nil {
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//return err
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} else {
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if ResourceInfoResponse.ResourceType == "file" {
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//limited fs
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remote := path.Base(root)
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f.setRoot(path.Dir(root))
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obj := f.newFsObjectWithInfo(remote, ResourceInfoResponse)
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// return a Fs Limited to this object
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return fs.NewLimited(f, obj), nil
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}
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}
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return f, nil
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}
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// Sets root in f
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func (f *Fs) setRoot(root string) {
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//Set root path
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f.root = strings.Trim(root, "/")
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//Set disk root path.
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//Adding "disk:" to root path as all paths on disk start with it
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var diskRoot = ""
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if f.root == "" {
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diskRoot = "disk:/"
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} else {
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diskRoot = "disk:/" + f.root + "/"
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}
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f.diskRoot = diskRoot
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}
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// list the objects into the function supplied
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//
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// If directories is set it only sends directories
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func (f *Fs) list(directories bool, fn func(string, yandex.ResourceInfoResponse)) {
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//request files list. list is divided into pages. We send request for each page
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//items per page is limited by limit
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//TODO may be add config parameter for the items per page limit
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var limit uint32 = 1000 // max number of object per request
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var itemsCount uint32 //number of items per page in response
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var offset uint32 //for the next page of request
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// yandex disk api request options
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var opt yandex.FlatFileListRequestOptions
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opt.Limit = &limit
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opt.Offset = &offset
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//query each page of list until itemCount is less then limit
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for {
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//send request
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info, err := f.yd.NewFlatFileListRequest(opt).Exec()
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if err != nil {
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fs.Stats.Error()
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fs.ErrorLog(f, "Couldn't list: %s", err)
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return
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}
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itemsCount = uint32(len(info.Items))
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//list files
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for _, item := range info.Items {
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// filter file list and get only files we need
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if strings.HasPrefix(item.Path, f.diskRoot) {
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//trim root folder from filename
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var name = strings.TrimPrefix(item.Path, f.diskRoot)
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fn(name, item)
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}
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}
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//offset for the next page of items
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offset += itemsCount
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//check if we reached end of list
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if itemsCount < limit {
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break
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}
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}
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}
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// List walks the path returning a channel of FsObjects
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func (f *Fs) List() fs.ObjectsChan {
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out := make(fs.ObjectsChan, fs.Config.Checkers)
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// List the objects
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go func() {
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defer close(out)
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f.list(false, func(remote string, object yandex.ResourceInfoResponse) {
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if fs := f.newFsObjectWithInfo(remote, &object); fs != nil {
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out <- fs
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}
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})
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}()
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return out
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}
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// NewFsObject returns an Object from a path
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//
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// May return nil if an error occurred
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func (f *Fs) NewFsObject(remote string) fs.Object {
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return f.newFsObjectWithInfo(remote, nil)
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}
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// Return an FsObject from a path
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//
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// May return nil if an error occurred
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func (f *Fs) newFsObjectWithInfo(remote string, info *yandex.ResourceInfoResponse) fs.Object {
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o := &Object{
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fs: f,
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remote: remote,
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}
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if info != nil {
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o.setMetaData(info)
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} else {
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err := o.readMetaData()
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if err != nil {
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fs.ErrorLog(f, "Couldn't get object '%s' metadata: %s", o.remotePath(), err)
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return nil
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}
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}
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return o
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}
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// setMetaData sets the fs data from a storage.Object
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func (o *Object) setMetaData(info *yandex.ResourceInfoResponse) {
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o.bytes = info.Size
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o.md5sum = info.Md5
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if info.CustomProperties["rclone_modified"] == nil {
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//read modTime from Modified property of object
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t, err := time.Parse(time.RFC3339Nano, info.Modified)
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if err != nil {
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return
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}
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o.modTime = t
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} else {
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// interface{} to string type assertion
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if modtimestr, ok := info.CustomProperties["rclone_modified"].(string); ok {
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//read modTime from rclone_modified custom_property of object
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t, err := time.Parse(time.RFC3339Nano, modtimestr)
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if err != nil {
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return
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}
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o.modTime = t
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} else {
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return //if it is not a string
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}
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}
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}
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// readMetaData gets the info if it hasn't already been fetched
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func (o *Object) readMetaData() (err error) {
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//request meta info
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var opt2 yandex.ResourceInfoRequestOptions
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ResourceInfoResponse, err := o.fs.yd.NewResourceInfoRequest(o.remotePath(), opt2).Exec()
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if err != nil {
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return err
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}
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o.setMetaData(ResourceInfoResponse)
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return nil
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}
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// ListDir walks the path returning a channel of FsObjects
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func (f *Fs) ListDir() fs.DirChan {
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out := make(fs.DirChan, fs.Config.Checkers)
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go func() {
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defer close(out)
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//request object meta info
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var opt yandex.ResourceInfoRequestOptions
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ResourceInfoResponse, err := f.yd.NewResourceInfoRequest(f.diskRoot, opt).Exec()
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if err != nil {
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return
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}
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if ResourceInfoResponse.ResourceType == "dir" {
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//list all subdirs
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for _, element := range ResourceInfoResponse.Embedded.Items {
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if element.ResourceType == "dir" {
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t, err := time.Parse(time.RFC3339Nano, element.Modified)
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if err != nil {
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return
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}
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out <- &fs.Dir{
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Name: element.Name,
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When: t,
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Bytes: int64(element.Size),
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Count: -1,
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}
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}
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}
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}
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}()
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return out
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}
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// Put the object
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//
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// Copy the reader in to the new object which is returned
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//
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// The new object may have been created if an error is returned
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func (f *Fs) Put(in io.Reader, remote string, modTime time.Time, size int64) (fs.Object, error) {
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o := &Object{
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fs: f,
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remote: remote,
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bytes: uint64(size),
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modTime: modTime,
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}
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//TODO maybe read metadata after upload to check if file uploaded successfully
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return o, o.Update(in, modTime, size)
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}
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// Mkdir creates the container if it doesn't exist
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func (f *Fs) Mkdir() error {
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return mkDirFullPath(f.yd, f.diskRoot)
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}
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// Rmdir deletes the container
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//
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// Returns an error if it isn't empty
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func (f *Fs) Rmdir() error {
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return f.purgeCheck(true)
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}
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// purgeCheck remotes the root directory, if check is set then it
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// refuses to do so if it has anything in
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func (f *Fs) purgeCheck(check bool) error {
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if check {
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//to comply with rclone logic we check if the directory is empty before delete.
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//send request to get list of objects in this directory.
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var opt yandex.ResourceInfoRequestOptions
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ResourceInfoResponse, err := f.yd.NewResourceInfoRequest(f.diskRoot, opt).Exec()
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if err != nil {
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return fmt.Errorf("Rmdir failed: %s", err)
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}
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if len(ResourceInfoResponse.Embedded.Items) != 0 {
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return fmt.Errorf("Rmdir failed: Directory not empty")
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}
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}
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//delete directory
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return f.yd.Delete(f.diskRoot, true)
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}
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// Precision return the precision of this Fs
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func (f *Fs) Precision() time.Duration {
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return time.Second
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}
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// Purge deletes all the files and the container
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//
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// Optional interface: Only implement this if you have a way of
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// deleting all the files quicker than just running Remove() on the
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// result of List()
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func (f *Fs) Purge() error {
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return f.purgeCheck(false)
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}
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// ------------------------------------------------------------
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// Fs returns the parent Fs
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func (o *Object) Fs() fs.Fs {
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return o.fs
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}
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// Return a string version
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func (o *Object) String() string {
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if o == nil {
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return "<nil>"
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}
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return o.remote
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}
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// Remote returns the remote path
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func (o *Object) Remote() string {
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return o.remote
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}
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// Md5sum returns the Md5sum of an object returning a lowercase hex string
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func (o *Object) Md5sum() (string, error) {
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return o.md5sum, nil
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}
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// Size returns the size of an object in bytes
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func (o *Object) Size() int64 {
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var size = int64(o.bytes) //need to cast from uint64 in yandex disk to int64 in rclone. can cause overflow
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return size
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}
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// ModTime returns the modification time of the object
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//
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// It attempts to read the objects mtime and if that isn't present the
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// LastModified returned in the http headers
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func (o *Object) ModTime() time.Time {
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err := o.readMetaData()
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if err != nil {
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fs.Log(o, "Failed to read metadata: %s", err)
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return time.Now()
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}
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return o.modTime
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}
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// Open an object for read
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func (o *Object) Open() (in io.ReadCloser, err error) {
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return o.fs.yd.Download(o.remotePath())
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}
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// Remove an object
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func (o *Object) Remove() error {
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return o.fs.yd.Delete(o.remotePath(), true)
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}
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// SetModTime sets the modification time of the local fs object
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//
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// Commits the datastore
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func (o *Object) SetModTime(modTime time.Time) {
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remote := o.remotePath()
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//set custom_property 'rclone_modified' of object to modTime
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err := o.fs.yd.SetCustomProperty(remote, "rclone_modified", modTime.Format(time.RFC3339Nano))
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if err != nil {
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return
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}
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return
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}
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// Storable returns whether this object is storable
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func (o *Object) Storable() bool {
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return true
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}
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// Returns the remote path for the object
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func (o *Object) remotePath() string {
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return o.fs.diskRoot + o.remote
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}
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// Update the already existing object
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//
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// Copy the reader into the object updating modTime and size
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//
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// The new object may have been created if an error is returned
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func (o *Object) Update(in io.Reader, modTime time.Time, size int64) error {
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remote := o.remotePath()
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//create full path to file before upload.
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err1 := mkDirFullPath(o.fs.yd, remote)
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if err1 != nil {
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return err1
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}
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//upload file
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overwrite := true //overwrite existing file
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err := o.fs.yd.Upload(in, remote, overwrite)
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if err == nil {
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//if file uploaded sucessfuly then return metadata
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o.bytes = uint64(size)
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o.modTime = modTime
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o.md5sum = "" // according to unit tests after put the md5 is empty.
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//and set modTime of uploaded file
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o.SetModTime(modTime)
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}
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return err
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}
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|
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// utility funcs-------------------------------------------------------------------
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|
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// mkDirExecute execute mkdir
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func mkDirExecute(client *yandex.Client, path string) (int, string, error) {
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statusCode, jsonErrorString, err := client.Mkdir(path)
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if statusCode == 409 { // dir already exist
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return statusCode, jsonErrorString, err
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}
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if statusCode == 201 { // dir was created
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return statusCode, jsonErrorString, err
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}
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if err != nil {
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// error creating directory
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log.Fatalf("Failed to create folder: %v", err)
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return statusCode, jsonErrorString, err
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}
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return 0, "", nil
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}
|
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|
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//mkDirFullPath Creates Each Directory in the path if needed. Send request once for every directory in the path.
|
|
func mkDirFullPath(client *yandex.Client, path string) error {
|
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//trim filename from path
|
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dirString := strings.TrimSuffix(path, filepath.Base(path))
|
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//trim "disk:/" from path
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dirString = strings.TrimPrefix(dirString, "disk:/")
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|
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//1 Try to create directory first
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if _, jsonErrorString, err := mkDirExecute(client, dirString); err != nil {
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er2, _ := client.ParseAPIError(jsonErrorString)
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if er2 != "DiskPathPointsToExistentDirectoryError" {
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//2 if it fails then create all directories in the path from root.
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dirs := strings.Split(dirString, "/") //path separator /
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var mkdirpath = "/" //path separator /
|
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for _, element := range dirs {
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if element != "" {
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mkdirpath += element + "/" //path separator /
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_, _, err2 := mkDirExecute(client, mkdirpath)
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if err2 != nil {
|
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//we continue even if some directories exist.
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}
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}
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}
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}
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}
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return nil
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}
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|
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// Check the interfaces are satisfied
|
|
var (
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_ fs.Fs = (*Fs)(nil)
|
|
_ fs.Purger = (*Fs)(nil)
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|
//_ fs.Copier = (*Fs)(nil)
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_ fs.Object = (*Object)(nil)
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)
|