private static DriveFileInfo GetDriveFolder(DriveClient client, string rootFolderId, IEnumerable <string> pathItems, bool createIfNotExists = false)
{
DriveFileInfo currentFolder = null;
string currentId = rootFolderId;
foreach (var pathItem in pathItems)
{
var getRequest = new DriveFileListRequest
{
MaxResults = 4,
Query = string.Format("trashed = false and title = '{0}' and mimeType = 'application/vnd.google-apps.folder'", pathItem)
};
var getResponse = client.Execute(getRequest);
currentFolder = getResponse.Data.Items.FirstOrDefault();
if (currentFolder == null)
{
if (!createIfNotExists)
{
break;
}
var createRequest = new DriveFolderCreateRequest(new DriveFolderShortInfo
{
Title = pathItem,
Parents = new List <DriveParentReferenceInfo>
{
new DriveParentReferenceInfo {
Id = currentId
}
}
});
var createResponse = client.Execute(createRequest);
currentFolder = createResponse.Data;
}
currentId = currentFolder.Id;
}
return(currentFolder);
}
public void DownloadFile()
{
Task.Factory.StartNew(() =>
{
try
{
IsDownloadingEnabled = false;
IsDownloadingInProgress = true;
if (AccessToken == null)
{
throw new InvalidOperationException("The client is not authorized.");
}
var fileInfo = new FileInfo(PathToLocalDownloadedFile);
if (fileInfo.Exists)
{
throw new InvalidOperationException(string.Format("File \"{0}\" already exists.", fileInfo.FullName));
}
string[] pathItems = PathToRemoteDownloadedFile.Split(new[] { '/', '\\' }, StringSplitOptions.RemoveEmptyEntries);
if (pathItems.Length == 0)
{
throw new InvalidOperationException("Path to remote file is empty");
}
string fileTitle = pathItems.Last();
string[] folderItems = pathItems.Length > 1 ? pathItems.Take(pathItems.Length - 1).ToArray() : null;
var folderInfo = GetDriveFolder(Client, DriveAbout.RootFolderId, folderItems);
if (folderItems != null && folderInfo == null)
{
throw new InvalidOperationException(string.Format("Folder \"{0}\" on Google Drive not found", string.Join("/", folderItems)));
}
var fileListRequest = new DriveFileListRequest
{
MaxResults = 4,
Query = string.Format("mimeType != 'application/vnd.google-apps.folder' and trashed = false and title = '{0}' and '{1}' in parents",
fileTitle, folderInfo != null ? folderInfo.Id : DriveAbout.RootFolderId)
};
var fileListResponse = Client.Execute(fileListRequest);
var remoteFileInfo = fileListResponse.Data.Items.FirstOrDefault();
if (remoteFileInfo == null)
{
throw new InvalidOperationException("Remote file not found");
}
using (var fileStream = fileInfo.OpenWrite())
{
var downloadRequest = new DriveFileDownloadRequest(remoteFileInfo, fileStream);
downloadRequest.DownloadProgress += (sender, args) =>
{
var progress = (args.Position / (double)args.Length) * 100;
DownloadingProgress = progress;
};
Client.Execute(downloadRequest);
}
}
catch (Exception exception)
{
RaiseErrorEvent(exception);
}
finally
{
IsDownloadingEnabled = true;
IsDownloadingInProgress = false;
DownloadingProgress = 0;
}
});
}
