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package drive
import (
"fmt"
"io"
"os"
"time"
"path/filepath"
"google.golang.org/api/drive/v3"
"google.golang.org/api/googleapi"
)
type DownloadArgs struct {
Out io.Writer
Progress io.Writer
Id string
Path string
Force bool
Recursive bool
Stdout bool
}
func (self *Drive) Download(args DownloadArgs) error {
return self.download(args)
}
func (self *Drive) download(args DownloadArgs) error {
f, err := self.service.Files.Get(args.Id).Fields("id", "name", "size", "mimeType", "md5Checksum").Do()
if err != nil {
return fmt.Errorf("Failed to get file: %s", err)
}
if isDir(f) && !args.Recursive {
return fmt.Errorf("'%s' is a directory, use --recursive to download directories", f.Name)
} else if isDir(f) && args.Recursive {
return self.downloadDirectory(f, args)
} else if isBinary(f) {
return self.downloadBinary(f, args)
} else if !args.Recursive {
return fmt.Errorf("'%s' is a google document and must be exported, see the export command", f.Name)
}
return nil
}
func (self *Drive) downloadBinary(f *drive.File, args DownloadArgs) error {
res, err := self.service.Files.Get(f.Id).Download()
if err != nil {
return fmt.Errorf("Failed to download file: %s", err)
}
// Close body on function exit
defer res.Body.Close()
// Wrap response body in progress reader
srcReader := getProgressReader(res.Body, args.Progress, res.ContentLength)
if args.Stdout {
// Write file content to stdout
_, err := io.Copy(args.Out, srcReader)
return err
}
filename := filepath.Join(args.Path, f.Name)
// Check if file exists
if !args.Force && fileExists(filename) {
return fmt.Errorf("File '%s' already exists, use --force to overwrite", filename)
}
// Ensure any parent directories exists
if err = mkdir(filename); err != nil {
return err
}
// Download to tmp file
tmpPath := filename + ".incomplete"
// Create new file
outFile, err := os.Create(tmpPath)
if err != nil {
return fmt.Errorf("Unable to create new file: %s", err)
}
fmt.Fprintf(args.Out, "\nDownloading %s...\n", f.Name)
started := time.Now()
// Save file to disk
bytes, err := io.Copy(outFile, srcReader)
if err != nil {
outFile.Close()
os.Remove(tmpPath)
return fmt.Errorf("Failed saving file: %s", err)
}
// Calculate average download rate
rate := calcRate(f.Size, started, time.Now())
fmt.Fprintf(args.Out, "Downloaded '%s' at %s/s, total %s\n", filename, formatSize(rate, false), formatSize(bytes, false))
//if deleteSourceFile {
// self.Delete(args.Id)
//}
// Close File
outFile.Close()
// Rename tmp file to proper filename
return os.Rename(tmpPath, filename)
}
func (self *Drive) downloadDirectory(parent *drive.File, args DownloadArgs) error {
listArgs := listAllFilesArgs{
query: fmt.Sprintf("'%s' in parents", parent.Id),
fields: []googleapi.Field{"nextPageToken", "files(id,name)"},
}
files, err := self.listAllFiles(listArgs)
if err != nil {
return fmt.Errorf("Failed listing files: %s", err)
}
newPath := filepath.Join(args.Path, parent.Name)
for _, f := range files {
// Copy args and update changed fields
newArgs := args
newArgs.Path = newPath
newArgs.Id = f.Id
newArgs.Stdout = false
err = self.download(newArgs)
if err != nil {
return err
}
}
return nil
}
func isDir(f *drive.File) bool {
return f.MimeType == DirectoryMimeType
}
func isBinary(f *drive.File) bool {
return f.Md5Checksum != ""
}
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