/// <summary>
/// Used to download the file at the given path from Google Drive.
/// </summary>
/// <param name="filePath">The Drive path of the file to download</param>
/// <returns>A stream for the downloaded file or null if the file couldn't be found</returns>
public MemoryStream GetGoogleDriveFileStream(string filePath)
{
// Get the file with the given path
GoogleDriveData.File file = GetGoogleDriveFile(filePath);
if (file == null)
{
return(null);
}
// Return the stream for the file
return(GetGoogleDriveFileStream(file));
}
/// <summary>
/// Used to download the given file from Google Drive.
/// </summary>
/// <param name="file">The file to download</param>
/// <returns>A stream for the downloaded file or null if the file couldn't be found</returns>
public MemoryStream GetGoogleDriveFileStream(GoogleDriveData.File file)
{
// Get the Google Drive service
DriveService driveService = GetDriveService();
// Prepare the download request
FilesResource.GetRequest getRequest = driveService.Files.Get(file.Id);
getRequest.MediaDownloader.ProgressChanged += GetGoogleDriveFileStream_ProgressChanged;
// Download the file
MemoryStream downloadStream = new MemoryStream();
getRequest.DownloadWithStatus(downloadStream);
// Go back to the start of the stream
downloadStream.Seek(0, SeekOrigin.Begin);
return(downloadStream);
}
/// <summary>
/// Used to get the Google Drive file at the specified path.
/// </summary>
/// <param name="filePath">The path of a file on Google Drive</param>
/// <returns>The requested file or null if it couldn't be found</returns>
public GoogleDriveData.File GetGoogleDriveFile(string filePath)
{
// Get the Drive service
DriveService service = GetDriveService();
// Escape any apostrophes in the file path
filePath = filePath.Replace("'", "\\'");
// Split the file path at forward slashes
string[] fileSections = filePath.Split('/');
// Go through each file section, working our way down the file path
string parentID = null;
GoogleDriveData.File file = null;
for (int sectionIndex = 0; sectionIndex < fileSections.Length; sectionIndex++)
{
string section = fileSections[sectionIndex];
// If this is the last file section then that means it's the file name
bool sectionIsFile = (sectionIndex == fileSections.Length - 1);
// Create the request to find the folder/file
FilesResource.ListRequest listRequest = service.Files.List();
// Set the query for the list request
if (sectionIsFile)
{
listRequest.Q = "name = '" + section + "'";
}
else
{
listRequest.Q = "mimeType = 'application/vnd.google-apps.folder' and name = '" + section + "'";
}
// If the parent ID isn't null, then add it to the list request query
if (parentID != null)
{
listRequest.Q += " and '" + parentID + "' in parents";
}
// Do the request
GoogleDriveData.FileList fileList = listRequest.Execute();
// If no files/folders were found then that means the file must not exist
if (fileList.Files == null || fileList.Files.Count == 0)
{
break;
}
// If the file returned is a file then we have found what we are looking for
GoogleDriveData.File currentFileOrFolder = fileList.Files.First();
if (sectionIsFile)
{
file = currentFileOrFolder;
break;
}
else
{
// Get the ID of the current folder
parentID = currentFileOrFolder.Id;
}
}
return(file);
}