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drive: add --drive-alternate-export to fix large doc export - fixes #2243

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The official drive APIs seem to have trouble downloading large
documents sometimes.

This commit adds a --drive-alternate-export flag to use an different,
unofficial set of export URLS which seem to download large files OK.
This commit is contained in:
Nick Craig-Wood 2018-04-16 11:26:18 +01:00
parent 9698a2babb
commit f073db81b1
2 changed files with 33 additions and 9 deletions
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13
backend/drive/drive.go
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@ -63,6 +63,7 @@ var (
driveUseCreatedDate = flags.BoolP("drive-use-created-date", "", false, "Use created date instead of modified date.")
driveListChunk = flags.Int64P("drive-list-chunk", "", 1000, "Size of listing chunk 100-1000. 0 to disable.")
driveImpersonate = flags.StringP("drive-impersonate", "", "", "Impersonate this user when using a service account.")
driveAlternateExport = flags.BoolP("drive-alternate-export", "", false, "Use alternate export URLs for google documents export.")
// chunkSize is the size of the chunks created during a resumable upload and should be a power of two.
// 1<<18 is the minimum size supported by the Google uploader, and there is no maximum.
chunkSize = fs.SizeSuffix(8 * 1024 * 1024)
@ -757,6 +758,18 @@ func (f *Fs) List(dir string) (entries fs.DirEntries, err error) {
}
obj := o.(*Object)
obj.url = fmt.Sprintf("%sfiles/%s/export?mimeType=%s", f.svc.BasePath, item.Id, url.QueryEscape(exportMimeType))
if *driveAlternateExport {
switch item.MimeType {
case "application/vnd.google-apps.drawing":
obj.url = fmt.Sprintf("https://docs.google.com/drawings/d/%s/export/%s", item.Id, extension)
case "application/vnd.google-apps.document":
obj.url = fmt.Sprintf("https://docs.google.com/document/d/%s/export?format=%s", item.Id, extension)
case "application/vnd.google-apps.spreadsheet":
obj.url = fmt.Sprintf("https://docs.google.com/spreadsheets/d/%s/export?format=%s", item.Id, extension)
case "application/vnd.google-apps.presentation":
obj.url = fmt.Sprintf("https://docs.google.com/presentation/d/%s/export/%s", item.Id, extension)
}
}
obj.isDocument = true
obj.mimeType = exportMimeType
obj.bytes = -1

11
docs/content/drive.md
View file

@ -414,6 +414,17 @@ Here are the possible extensions with their corresponding mime types.
| xlsx | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet | Microsoft Office Spreadsheet |
| zip | application/zip | A ZIP file of HTML, Images CSS |
#### --drive-alternate-export ####
If this option is set this instructs rclone to use an alternate set of
export URLs for drive documents. Users have reported that the
official export URLs can't export large documents, whereas these
unofficial ones can.
See rclone issue [#2243](https://github.com/ncw/rclone/issues/2243) for background,
[this google drive issue](https://issuetracker.google.com/issues/36761333) and
[this helpful post](https://www.labnol.org/internet/direct-links-for-google-drive/28356/).
#### --drive-impersonate user ####
When using a service account, this instructs rclone to impersonate the user passed in.