645 lines
15 KiB
Go
645 lines
15 KiB
Go
package server
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"mime"
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"net/http"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"github.com/goamz/goamz/s3"
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"golang.org/x/net/context"
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"golang.org/x/oauth2"
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"golang.org/x/oauth2/google"
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"google.golang.org/api/drive/v3"
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"google.golang.org/api/googleapi"
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)
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type Storage interface {
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Get(token string, filename string) (reader io.ReadCloser, contentType string, contentLength uint64, err error)
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Head(token string, filename string) (contentType string, contentLength uint64, err error)
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Put(token string, filename string, reader io.Reader, contentType string, contentLength uint64) error
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Delete(token string, filename string) error
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IsNotExist(err error) bool
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Type() string
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}
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type LocalStorage struct {
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Storage
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basedir string
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logger *log.Logger
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}
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func NewLocalStorage(basedir string, logger *log.Logger) (*LocalStorage, error) {
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return &LocalStorage{basedir: basedir, logger: logger}, nil
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}
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func (s *LocalStorage) Type() string {
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return "local"
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}
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func (s *LocalStorage) Head(token string, filename string) (contentType string, contentLength uint64, err error) {
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path := filepath.Join(s.basedir, token, filename)
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var fi os.FileInfo
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if fi, err = os.Lstat(path); err != nil {
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return
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}
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contentLength = uint64(fi.Size())
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contentType = mime.TypeByExtension(filepath.Ext(filename))
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return
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}
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func (s *LocalStorage) Get(token string, filename string) (reader io.ReadCloser, contentType string, contentLength uint64, err error) {
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path := filepath.Join(s.basedir, token, filename)
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// content type , content length
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if reader, err = os.Open(path); err != nil {
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return
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}
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var fi os.FileInfo
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if fi, err = os.Lstat(path); err != nil {
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return
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}
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contentLength = uint64(fi.Size())
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contentType = mime.TypeByExtension(filepath.Ext(filename))
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return
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}
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func (s *LocalStorage) Delete(token string, filename string) (err error) {
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metadata := filepath.Join(s.basedir, token, fmt.Sprintf("%s.metadata", filename))
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os.Remove(metadata)
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path := filepath.Join(s.basedir, token, filename)
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err = os.Remove(path)
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return
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}
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func (s *LocalStorage) IsNotExist(err error) bool {
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if err == nil {
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return false
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}
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return os.IsNotExist(err)
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}
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func (s *LocalStorage) Put(token string, filename string, reader io.Reader, contentType string, contentLength uint64) error {
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var f io.WriteCloser
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var err error
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path := filepath.Join(s.basedir, token)
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if err = os.Mkdir(path, 0700); err != nil && !os.IsExist(err) {
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return err
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}
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if f, err = os.OpenFile(filepath.Join(path, filename), os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600); err != nil {
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return err
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}
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defer f.Close()
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if _, err = io.Copy(f, reader); err != nil {
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return err
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}
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return nil
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}
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type S3Storage struct {
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Storage
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bucket *s3.Bucket
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logger *log.Logger
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noMultipart bool
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}
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func NewS3Storage(accessKey, secretKey, bucketName, endpoint string, logger *log.Logger, disableMultipart bool) (*S3Storage, error) {
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bucket, err := getBucket(accessKey, secretKey, bucketName, endpoint)
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if err != nil {
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return nil, err
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}
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return &S3Storage{bucket: bucket, logger: logger, noMultipart: disableMultipart}, nil
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}
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func (s *S3Storage) Type() string {
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return "s3"
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}
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func (s *S3Storage) Head(token string, filename string) (contentType string, contentLength uint64, err error) {
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key := fmt.Sprintf("%s/%s", token, filename)
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// content type , content length
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response, err := s.bucket.Head(key, map[string][]string{})
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if err != nil {
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return
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}
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contentType = response.Header.Get("Content-Type")
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contentLength, err = strconv.ParseUint(response.Header.Get("Content-Length"), 10, 0)
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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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func (s *S3Storage) IsNotExist(err error) bool {
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if err == nil {
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return false
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}
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s.logger.Printf("IsNotExist: %s, %#v", err.Error(), err)
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b := (err.Error() == "The specified key does not exist.")
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b = b || (err.Error() == "Access Denied")
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return b
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}
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func (s *S3Storage) Get(token string, filename string) (reader io.ReadCloser, contentType string, contentLength uint64, err error) {
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key := fmt.Sprintf("%s/%s", token, filename)
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// content type , content length
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response, err := s.bucket.GetResponse(key)
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if err != nil {
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return
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}
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contentType = response.Header.Get("Content-Type")
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contentLength, err = strconv.ParseUint(response.Header.Get("Content-Length"), 10, 0)
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if err != nil {
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return
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}
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reader = response.Body
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return
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}
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func (s *S3Storage) Delete(token string, filename string) (err error) {
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metadata := fmt.Sprintf("%s/%s.metadata", token, filename)
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s.bucket.Del(metadata)
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key := fmt.Sprintf("%s/%s", token, filename)
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err = s.bucket.Del(key)
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return
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}
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func (s *S3Storage) putMulti(key string, reader io.Reader, contentType string, contentLength uint64) (err error) {
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var (
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multi *s3.Multi
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parts []s3.Part
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)
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if multi, err = s.bucket.InitMulti(key, contentType, s3.Private); err != nil {
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s.logger.Printf(err.Error())
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return
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}
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// 20 mb parts
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partsChan := make(chan interface{})
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// partsChan := make(chan s3.Part)
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go func() {
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// maximize to 20 threads
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sem := make(chan int, 20)
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index := 1
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var wg sync.WaitGroup
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for {
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// buffered in memory because goamz s3 multi needs seekable reader
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var (
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buffer []byte = make([]byte, (1<<20)*10)
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count int
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err error
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)
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// Amazon expects parts of at least 5MB, except for the last one
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if count, err = io.ReadAtLeast(reader, buffer, (1<<20)*5); err != nil && err != io.ErrUnexpectedEOF && err != io.EOF {
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s.logger.Printf(err.Error())
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return
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}
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// always send minimal 1 part
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if err == io.EOF && index > 1 {
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s.logger.Printf("Waiting for all parts to finish uploading.")
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// wait for all parts to be finished uploading
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wg.Wait()
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// and close the channel
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close(partsChan)
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return
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}
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wg.Add(1)
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sem <- 1
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// using goroutines because of retries when upload fails
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go func(multi *s3.Multi, buffer []byte, index int) {
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s.logger.Printf("Uploading part %d %d", index, len(buffer))
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defer func() {
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s.logger.Printf("Finished part %d %d", index, len(buffer))
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wg.Done()
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<-sem
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}()
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partReader := bytes.NewReader(buffer)
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var part s3.Part
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if part, err = multi.PutPart(index, partReader); err != nil {
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s.logger.Printf("Error while uploading part %d %d %s", index, len(buffer), err.Error())
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partsChan <- err
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return
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}
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s.logger.Printf("Finished uploading part %d %d", index, len(buffer))
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partsChan <- part
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}(multi, buffer[:count], index)
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index++
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}
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}()
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// wait for all parts to be uploaded
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for part := range partsChan {
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switch part.(type) {
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case s3.Part:
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parts = append(parts, part.(s3.Part))
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case error:
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// abort multi upload
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s.logger.Printf("Error during upload, aborting %s.", part.(error).Error())
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err = part.(error)
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multi.Abort()
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return
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}
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}
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s.logger.Printf("Completing upload %d parts", len(parts))
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if err = multi.Complete(parts); err != nil {
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s.logger.Printf("Error during completing upload %d parts %s", len(parts), err.Error())
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return
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}
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s.logger.Printf("Completed uploading %d", len(parts))
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return
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}
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func (s *S3Storage) Put(token string, filename string, reader io.Reader, contentType string, contentLength uint64) (err error) {
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key := fmt.Sprintf("%s/%s", token, filename)
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s.logger.Printf("Uploading file %s to S3 Bucket", filename)
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if !s.noMultipart {
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err = s.putMulti(key, reader, contentType, contentLength)
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} else {
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err = s.bucket.PutReader(key, reader, int64(contentLength), contentType, s3.Private, s3.Options{})
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}
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if err != nil {
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return
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}
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s.logger.Printf("Completed uploading %s", filename)
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return
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}
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type GDrive struct {
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service *drive.Service
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rootId string
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basedir string
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localConfigPath string
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chunkSize int
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logger *log.Logger
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}
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func NewGDriveStorage(clientJsonFilepath string, localConfigPath string, basedir string, chunkSize int, logger *log.Logger) (*GDrive, error) {
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b, err := ioutil.ReadFile(clientJsonFilepath)
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if err != nil {
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return nil, err
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}
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// If modifying these scopes, delete your previously saved client_secret.json.
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config, err := google.ConfigFromJSON(b, drive.DriveScope, drive.DriveMetadataScope)
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if err != nil {
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return nil, err
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}
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srv, err := drive.New(getGDriveClient(config, localConfigPath, logger))
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if err != nil {
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return nil, err
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}
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chunkSize = chunkSize * 1024 * 1024
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storage := &GDrive{service: srv, basedir: basedir, rootId: "", localConfigPath: localConfigPath, chunkSize: chunkSize, logger: logger}
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err = storage.setupRoot()
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if err != nil {
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return nil, err
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}
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return storage, nil
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}
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const GDriveRootConfigFile = "root_id.conf"
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const GDriveTokenJsonFile = "token.json"
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const GDriveDirectoryMimeType = "application/vnd.google-apps.folder"
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func (s *GDrive) setupRoot() error {
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rootFileConfig := filepath.Join(s.localConfigPath, GDriveRootConfigFile)
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rootId, err := ioutil.ReadFile(rootFileConfig)
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if err != nil && !os.IsNotExist(err) {
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return err
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}
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if string(rootId) != "" {
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s.rootId = string(rootId)
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return nil
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}
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dir := &drive.File{
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Name: s.basedir,
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MimeType: GDriveDirectoryMimeType,
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}
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di, err := s.service.Files.Create(dir).Fields("id").Do()
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if err != nil {
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return err
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}
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s.rootId = di.Id
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err = ioutil.WriteFile(rootFileConfig, []byte(s.rootId), os.FileMode(0600))
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if err != nil {
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return err
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}
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return nil
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}
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func (s *GDrive) hasChecksum(f *drive.File) bool {
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return f.Md5Checksum != ""
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}
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func (s *GDrive) list(nextPageToken string, q string) (*drive.FileList, error) {
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return s.service.Files.List().Fields("nextPageToken, files(id, name, mimeType)").Q(q).PageToken(nextPageToken).Do()
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}
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func (s *GDrive) findId(filename string, token string) (string, error) {
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filename = strings.Replace(filename, `'`, `\'`, -1)
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filename = strings.Replace(filename, `"`, `\"`, -1)
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fileId, tokenId, nextPageToken := "", "", ""
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q := fmt.Sprintf("'%s' in parents and name='%s' and mimeType='%s' and trashed=false", s.rootId, token, GDriveDirectoryMimeType)
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l, err := s.list(nextPageToken, q)
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if err != nil {
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return "", err
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}
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for 0 < len(l.Files) {
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for _, fi := range l.Files {
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tokenId = fi.Id
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break
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}
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if l.NextPageToken == "" {
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break
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}
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l, err = s.list(l.NextPageToken, q)
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}
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if filename == "" {
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return tokenId, nil
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} else if tokenId == "" {
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return "", fmt.Errorf("Cannot find file %s/%s", token, filename)
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}
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q = fmt.Sprintf("'%s' in parents and name='%s' and mimeType!='%s' and trashed=false", tokenId, filename, GDriveDirectoryMimeType)
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l, err = s.list(nextPageToken, q)
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if err != nil {
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return "", err
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}
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for 0 < len(l.Files) {
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for _, fi := range l.Files {
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fileId = fi.Id
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break
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}
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if l.NextPageToken == "" {
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break
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}
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l, err = s.list(l.NextPageToken, q)
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}
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if fileId == "" {
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return "", fmt.Errorf("Cannot find file %s/%s", token, filename)
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}
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return fileId, nil
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}
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func (s *GDrive) Type() string {
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return "gdrive"
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}
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func (s *GDrive) Head(token string, filename string) (contentType string, contentLength uint64, err error) {
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var fileId string
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fileId, err = s.findId(filename, token)
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if err != nil {
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return
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}
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var fi *drive.File
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if fi, err = s.service.Files.Get(fileId).Fields("mimeType", "size").Do(); err != nil {
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return
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}
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contentLength = uint64(fi.Size)
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contentType = fi.MimeType
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return
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}
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func (s *GDrive) Get(token string, filename string) (reader io.ReadCloser, contentType string, contentLength uint64, err error) {
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var fileId string
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fileId, err = s.findId(filename, token)
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if err != nil {
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return
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}
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var fi *drive.File
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fi, err = s.service.Files.Get(fileId).Fields("mimeType", "size", "md5Checksum").Do()
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if !s.hasChecksum(fi) {
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err = fmt.Errorf("Cannot find file %s/%s", token, filename)
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return
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}
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contentLength = uint64(fi.Size)
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contentType = fi.MimeType
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ctx := context.Background()
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var res *http.Response
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res, err = s.service.Files.Get(fileId).Context(ctx).Download()
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if err != nil {
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return
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}
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reader = res.Body
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return
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}
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func (s *GDrive) Delete(token string, filename string) (err error) {
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metadata, _ := s.findId(fmt.Sprintf("%s.metadata", filename), token)
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s.service.Files.Delete(metadata).Do()
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var fileId string
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fileId, err = s.findId(filename, token)
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if err != nil {
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return
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}
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err = s.service.Files.Delete(fileId).Do()
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return
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}
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func (s *GDrive) IsNotExist(err error) bool {
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if err == nil {
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return false
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}
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if err != nil {
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if e, ok := err.(*googleapi.Error); ok {
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return e.Code == http.StatusNotFound
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}
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}
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return false
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}
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func (s *GDrive) Put(token string, filename string, reader io.Reader, contentType string, contentLength uint64) error {
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dirId, err := s.findId("", token)
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if err != nil {
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return err
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}
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if dirId == "" {
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dir := &drive.File{
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Name: token,
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Parents: []string{s.rootId},
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MimeType: GDriveDirectoryMimeType,
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}
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di, err := s.service.Files.Create(dir).Fields("id").Do()
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if err != nil {
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return err
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}
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dirId = di.Id
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}
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// Instantiate empty drive file
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dst := &drive.File{
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Name: filename,
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Parents: []string{dirId},
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MimeType: contentType,
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}
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ctx := context.Background()
|
|
_, err = s.service.Files.Create(dst).Context(ctx).Media(reader, googleapi.ChunkSize(s.chunkSize)).Do()
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Retrieve a token, saves the token, then returns the generated client.
|
|
func getGDriveClient(config *oauth2.Config, localConfigPath string, logger *log.Logger) *http.Client {
|
|
tokenFile := filepath.Join(localConfigPath, GDriveTokenJsonFile)
|
|
tok, err := gDriveTokenFromFile(tokenFile)
|
|
if err != nil {
|
|
tok = getGDriveTokenFromWeb(config, logger)
|
|
saveGDriveToken(tokenFile, tok, logger)
|
|
}
|
|
|
|
return config.Client(context.Background(), tok)
|
|
}
|
|
|
|
// Request a token from the web, then returns the retrieved token.
|
|
func getGDriveTokenFromWeb(config *oauth2.Config, logger *log.Logger) *oauth2.Token {
|
|
authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
|
|
fmt.Printf("Go to the following link in your browser then type the "+
|
|
"authorization code: \n%v\n", authURL)
|
|
|
|
var authCode string
|
|
if _, err := fmt.Scan(&authCode); err != nil {
|
|
logger.Fatalf("Unable to read authorization code %v", err)
|
|
}
|
|
|
|
tok, err := config.Exchange(context.TODO(), authCode)
|
|
if err != nil {
|
|
logger.Fatalf("Unable to retrieve token from web %v", err)
|
|
}
|
|
return tok
|
|
}
|
|
|
|
// Retrieves a token from a local file.
|
|
func gDriveTokenFromFile(file string) (*oauth2.Token, error) {
|
|
f, err := os.Open(file)
|
|
defer f.Close()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
tok := &oauth2.Token{}
|
|
err = json.NewDecoder(f).Decode(tok)
|
|
return tok, err
|
|
}
|
|
|
|
// Saves a token to a file path.
|
|
func saveGDriveToken(path string, token *oauth2.Token, logger *log.Logger) {
|
|
logger.Printf("Saving credential file to: %s\n", path)
|
|
f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
|
|
defer f.Close()
|
|
if err != nil {
|
|
logger.Fatalf("Unable to cache oauth token: %v", err)
|
|
}
|
|
|
|
json.NewEncoder(f).Encode(token)
|
|
}
|