/// <summary>
/// Scarica un file dal Cloud.
/// </summary>
/// <param name="FileName">Nome del file da scaricare</param>
/// <param name="DestFileName">Nome del file di destinazione</param>
/// <returns>Restituisce FileDownloaded se l'operazione ha successo, altrimenti restituisce
/// FileDownloadError in caso di errore o FileNotFound se il file non esiste</returns>
public async Task <CloudFileStatus> GetFile(string FileName, string DestFileName)
{
const string UrlRoot = URLBase + "/me/drive/special/approot:/";
if (!await CheckToken())
{
Debug.WriteLine("User is not logged in!");
return(CloudFileStatus.FileDownloadError);
}
try
{
CloudFileStatus Result = await FileExists(FileName);
if (Result == CloudFileStatus.FileError || Result == CloudFileStatus.FileNotFound)
{
throw new Exception(string.Format(string.Format("{0}: Unable to download the file {1}. Error: {2}", AppResources.errCloudDownload, FileName, GetLastError())));
}
// Posso scaricare il file
if (!await DownloadFile(UrlRoot + FileName, DestFileName))
{
Result = CloudFileStatus.FileDownloadError;
}
return(CloudFileStatus.FileDownloaded);
}
catch (Exception e)
{
Debug.WriteLine(string.Format("GetFile error: {0}", e.Message));
throw;
}
}
/// <summary>
/// Scarica un file dal Cloud.
/// </summary>
/// <param name="FileName">Nome del file da scaricare</param>
/// <param name="DestFileName">Nome del file di destinazione</param>
/// <returns>Restituisce FileDownloaded se l'operazione ha successo, altrimenti restituisce
/// FileDownloadError in caso di errore o FileNotFound se il file non esiste</returns>
public async Task <CloudFileStatus> GetFile(string FileName, string DestFileName)
{
if (!await CheckToken())
{
Debug.WriteLine("User is not logged in!");
return(CloudFileStatus.FileDownloadError);
}
try
{
DriveFileInfo driveFileInfo = await GetFileInfo(FileName);
CloudFileStatus Result = driveFileInfo.Status;
if (Result == CloudFileStatus.FileError || Result == CloudFileStatus.FileNotFound)
{
throw new Exception(string.Format(string.Format("{0}: Unable to download the file {1}. Error: {2}", AppResources.errCloudDownload, FileName, GetLastError())));
}
// Posso scaricare il file
if (!await DownloadFile(driveFileInfo.FileID, DestFileName))
{
Result = CloudFileStatus.FileDownloadError;
}
return(CloudFileStatus.FileDownloaded);
}
catch (Exception e)
{
Debug.WriteLine(string.Format("GetFile error: {0}", e.Message));
throw;
}
}
/// <summary>
/// Verifica se un determinato file esiste su OneDrive.
/// </summary>
/// <param name="FileName">Nome del file</param>
/// <returns>Restituisce FileNotFound se il file non viene trovato, FileFound se esiste
/// o FileError in caso di errore. Chiamare la funzione GetLastError per informazioni sull'eventuale
/// errore.</returns>
public async Task <CloudFileStatus> FileExists(string FileName)
{
LastError = "";
const string UrlRoot = URLBase + "/me/drive/special/approot/";
CloudFileStatus Result = CloudFileStatus.FileNotFound;
if (!await CheckToken())
{
LastError = "User is not logged in!";
Debug.WriteLine(LastError);
return(CloudFileStatus.FileError);
}
// Ottiene la lista dei file nella cartella dedicata all'App
HttpClient appClient = new HttpClient();
try
{
string Url = UrlRoot + "children";
if (string.Compare(Path.GetFileName(FileName), FileName) != 0)
{
string[] tokens = FileName.Split(new [] { Path.DirectorySeparatorChar });
if (tokens.Length > 1)
{
Url = URLBase + "/me/drive/special/approot:";
for (int i = 0; i < tokens.Length - 1; i++)
{
if (tokens[i].Length > 0)
{
Url += "/" + tokens[i];
}
}
Url += ":/children/";
FileName = tokens[tokens.Length - 1];
}
}
appClient.DefaultRequestHeaders.Clear();
appClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", Account.AccessToken);
HttpResponseMessage Response = await appClient.GetAsync(new Uri(Url));
if (!Response.IsSuccessStatusCode)
{
appClient.Dispose();
LastError = "Unable to find the file " + FileName + ". Status code: " + Response.StatusCode;
Debug.WriteLine(LastError);
return(CloudFileStatus.FileError);
}
// Cerca nel JSON il file
JObject JsonObj = JObject.Parse(await Response.Content.ReadAsStringAsync());
if (JsonObj != null)
{
JArray DriveItems = JArray.Parse(JsonObj["value"].ToString());
if (DriveItems != null)
{
Result = CloudFileStatus.FileNotFound;
foreach (JObject JsonDriveItem in DriveItems)
{
if (JsonDriveItem != null)
{
if (JsonDriveItem["name"].ToString().CompareTo(FileName) == 0)
{
// Trovato!
Result = CloudFileStatus.FileFound;
break;
}
}
}
}
}
else
{
appClient.Dispose();
LastError = "Unable to find the file " + FileName + ". Malformed response";
Debug.WriteLine(LastError);
return(CloudFileStatus.FileError);
}
}
catch (Exception Ex)
{
appClient.Dispose();
LastError = "Unable to find the file " + FileName + ": " + Ex.Message;
Debug.WriteLine(LastError);
return(CloudFileStatus.FileError);
}
appClient.Dispose();
return(Result);
}
