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drive: fix google docs in rclone mount in some circumstances #1732

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Before this change any attempt to access a google doc in an rclone
mount would give the error "partial downloads are not supported while
exporting Google Documents" as the mount uses ranged requests to read
data.

This implements ranged requests for a limited number of scenarios,
just enough so that Google docs can be cat-ed from an rclone mount.
When they are cat-ed then they receive their correct size also.
This commit is contained in:
Nick Craig-Wood 2019-01-31 10:39:13 +00:00
parent 291f270904
commit 4e4feebf0a
1 changed files with 19 additions and 2 deletions
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21
backend/drive/drive.go
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@ -39,6 +39,7 @@ import (
"github.com/ncw/rclone/lib/dircache"
"github.com/ncw/rclone/lib/oauthutil"
"github.com/ncw/rclone/lib/pacer"
"github.com/ncw/rclone/lib/readers"
"github.com/pkg/errors"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
@ -2494,16 +2495,32 @@ func (o *documentObject) Open(options ...fs.OpenOption) (in io.ReadCloser, err e
// Update the size with what we are reading as it can change from
// the HEAD in the listing to this GET. This stops rclone marking
// the transfer as corrupted.
var offset, end int64 = 0, -1
var newOptions = options[:0]
for _, o := range options {
// Note that Range requests don't work on Google docs:
// https://developers.google.com/drive/v3/web/manage-downloads#partial_download
if _, ok := o.(*fs.RangeOption); ok {
return nil, errors.New("partial downloads are not supported while exporting Google Documents")
// So do a subset of them manually
switch x := o.(type) {
case *fs.RangeOption:
offset, end = x.Start, x.End
case *fs.SeekOption:
offset, end = x.Offset, -1
default:
newOptions = append(newOptions, o)
}
}
options = newOptions
if offset != 0 {
return nil, errors.New("partial downloads are not supported while exporting Google Documents")
}
in, err = o.baseObject.open(o.url, options...)
if in != nil {
in = &openDocumentFile{o: o, in: in}
}
if end >= 0 {
in = readers.NewLimitedReadCloser(in, end-offset+1)
}
return
}
func (o *linkObject) Open(options ...fs.OpenOption) (in io.ReadCloser, err error) {