drive: add support of SHA-1 and SHA-256 checksum

backend/drive/drive.go

@@ -71,7 +71,7 @@ const (
 	// 1<<18 is the minimum size supported by the Google uploader, and there is no maximum.
 	minChunkSize     = fs.SizeSuffix(googleapi.MinUploadChunkSize)
 	defaultChunkSize = 8 * fs.Mebi
-	partialFields    = "id,name,size,md5Checksum,trashed,explicitlyTrashed,modifiedTime,createdTime,mimeType,parents,webViewLink,shortcutDetails,exportLinks,resourceKey"
+	partialFields    = "id,name,size,md5Checksum,sha1Checksum,sha256Checksum,trashed,explicitlyTrashed,modifiedTime,createdTime,mimeType,parents,webViewLink,shortcutDetails,exportLinks,resourceKey"
 	listRGrouping    = 50   // number of IDs to search at once when using ListR
 	listRInputBuffer = 1000 // size of input buffer when using ListR
 	defaultXDGIcon   = "text-html"
@@ -323,13 +323,13 @@ rather than shortcuts themselves when doing server side copies.`,
 		}, {
 			Name:    "skip_checksum_gphotos",
 			Default: false,
-			Help: `Skip MD5 checksum on Google photos and videos only.
+			Help: `Skip checksums on Google photos and videos only.
 
 Use this if you get checksum errors when transferring Google photos or
 videos.
 
 Setting this flag will cause Google photos and videos to return a
-blank MD5 checksum.
+blank checksums.
 
 Google photos are identified by being in the "photos" space.
 
@@ -751,6 +751,8 @@ type Object struct {
 	baseObject
 	url        string // Download URL of this object
 	md5sum     string // md5sum of the object
+	sha1sum    string // sha1sum of the object
+	sha256sum  string // sha256sum of the object
 	v2Download bool   // generate v2 download link ondemand
 }
 
@@ -1414,6 +1416,8 @@ func (f *Fs) newRegularObject(remote string, info *drive.File) fs.Object {
 		for _, space := range info.Spaces {
 			if space == "photos" {
 				info.Md5Checksum = ""
+				info.Sha1Checksum = ""
+				info.Sha256Checksum = ""
 				break
 			}
 		}
@@ -1422,6 +1426,8 @@ func (f *Fs) newRegularObject(remote string, info *drive.File) fs.Object {
 		baseObject: f.newBaseObject(remote, info),
 		url:        fmt.Sprintf("%sfiles/%s?alt=media", f.svc.BasePath, actualID(info.Id)),
 		md5sum:     strings.ToLower(info.Md5Checksum),
+		sha1sum:    strings.ToLower(info.Sha1Checksum),
+		sha256sum:  strings.ToLower(info.Sha256Checksum),
 		v2Download: f.opt.V2DownloadMinSize != -1 && info.Size >= int64(f.opt.V2DownloadMinSize),
 	}
 	if info.ResourceKey != "" {
@@ -3007,7 +3013,7 @@ func (f *Fs) DirCacheFlush() {
 
 // Hashes returns the supported hash sets.
 func (f *Fs) Hashes() hash.Set {
-	return hash.Set(hash.MD5)
+	return hash.NewHashSet(hash.MD5, hash.SHA1, hash.SHA256)
 }
 
 func (f *Fs) changeChunkSize(chunkSizeString string) (err error) {
@@ -3568,10 +3574,16 @@ func (o *baseObject) Remote() string {
 
 // Hash returns the Md5sum of an object returning a lowercase hex string
 func (o *Object) Hash(ctx context.Context, t hash.Type) (string, error) {
-	if t != hash.MD5 {
+	if t == hash.MD5 {
-		return "", hash.ErrUnsupported
-	}
 		return o.md5sum, nil
+	}
+	if t == hash.SHA1 {
+		return o.sha1sum, nil
+	}
+	if t == hash.SHA256 {
+		return o.sha256sum, nil
+	}
+	return "", hash.ErrUnsupported
 }
 func (o *baseObject) Hash(ctx context.Context, t hash.Type) (string, error) {
 	if t != hash.MD5 {

docs/content/drive.md

@@ -772,13 +772,13 @@ Properties:
 
 #### --drive-skip-checksum-gphotos
 
-Skip MD5 checksum on Google photos and videos only.
+Skip checksums on Google photos and videos only.
 
 Use this if you get checksum errors when transferring Google photos or
 videos.
 
 Setting this flag will cause Google photos and videos to return a
-blank MD5 checksum.
+blank checksums.
 
 Google photos are identified by being in the "photos" space.
 
@@ -1526,6 +1526,10 @@ Waiting a moderate period of time between attempts (estimated to be
 approximately 1 hour) and/or not using --fast-list both seem to be
 effective in preventing the problem.
 
+### Hashes
+
+We need to say that all files have MD5 hashes, but a small fraction of files uploaded may not have SHA1 or SHA256 hashes especially if they were uploaded before 2018.
+
 ## Making your own client_id
 
 When you use rclone with Google drive in its default configuration you

docs/content/overview.md

@@ -15,7 +15,7 @@ show through.
 Here is an overview of the major features of each cloud storage system.
 
 | Name                         | Hash              | ModTime | Case Insensitive | Duplicate Files | MIME Type | Metadata |
-| ---------------------------- |:----------------:|:-------:|:----------------:|:---------------:|:---------:|:--------:|
+| ---------------------------- |:-----------------:|:-------:|:----------------:|:---------------:|:---------:|:--------:|
 | 1Fichier                     | Whirlpool         | -       | No               | Yes             | R         | -        |
 | Akamai Netstorage            | MD5, SHA256       | R/W     | No               | No              | R         | -        |
 | Amazon Drive                 | MD5               | -       | Yes              | No              | R         | -        |
@@ -27,7 +27,7 @@ Here is an overview of the major features of each cloud storage system.
 | Enterprise File Fabric       | -                 | R/W     | Yes              | No              | R/W       | -        |
 | FTP                          | -                 | R/W ¹⁰  | No               | No              | -         | -        |
 | Google Cloud Storage         | MD5               | R/W     | No               | No              | R/W       | -        |
-| Google Drive                 | MD5              | R/W     | No               | Yes             | R/W       | -        |
+| Google Drive                 | MD5, SHA1, SHA256 | R/W     | No               | Yes             | R/W       | -        |
 | Google Photos                | -                 | -       | No               | Yes             | R         | -        |
 | HDFS                         | -                 | R/W     | No               | No              | -         | -        |
 | HiDrive                      | HiDrive ¹²        | R/W     | No               | No              | -         | -        |