/// <summary>
/// Creates or updates this item in the remote storage.
/// </summary>
/// <param name="remoteStorageUri">Uri of the file to be created or updated in the remote storage.</param>
/// <param name="newInfo">New information about the file or folder, such as modification date, attributes, custom data, etc.</param>
/// <param name="mode">Specifies if a new file should be created or existing file should be updated.</param>
/// <param name="content">New file content or null if the file content is not modified.</param>
/// <param name="eTagOld">The ETag to be sent to the remote storage as part of the update request to make sure the content is not overwritten.</param>
/// <param name="lockInfo">Information about the lock. Caller passes null if the item is not locked.</param>
/// <returns>The new ETag returned from the remote storage.</returns>
protected static async Task <string> CreateOrUpdateFileAsync(
Uri remoteStorageUri, IFileSystemItemMetadata newInfo, FileMode mode, Stream content = null, string eTagOld = null, ServerLockInfo lockInfo = null)
{
string eTagNew = null;
if (content != null || mode == FileMode.CreateNew)
{
long contentLength = content != null ? content.Length : 0;
IWebRequestAsync request = await Program.DavClient.GetFileWriteRequestAsync(
remoteStorageUri, null, contentLength, 0, -1, lockInfo?.LockToken, eTagOld);
// Update remote storage file content.
using (Stream davContentStream = await request.GetRequestStreamAsync())
{
if (content != null)
{
await content.CopyToAsync(davContentStream);
}
// Get the new ETag returned by the server (if any).
// We return the new ETag to the Engine to be stored with the file unlil the next update.
IWebResponseAsync response = await request.GetResponseAsync();
eTagNew = response.Headers["ETag"];
response.Close();
}
}
return(eTagNew);
}
/// <inheritdoc/>
public async Task WriteAsync(IFileMetadata fileMetadata, Stream content = null)
{
if (MsOfficeHelper.IsMsOfficeLocked(UserFileSystemPath)) // Required for PowerPoint. It does not block the for writing.
{
throw new ClientLockFailedException("The file is blocked for writing.");
}
Logger.LogMessage($"{nameof(IFile)}.{nameof(WriteAsync)}()", UserFileSystemPath);
ExternalDataManager customDataManager = Engine.CustomDataManager(UserFileSystemPath);
// Send the ETag to the server as part of the update to ensure the file in the remote storge is not modified since last read.
string oldEtag = await customDataManager.ETagManager.GetETagAsync();
// Send the lock-token to the server as part of the update.
string lockToken = (await customDataManager.LockManager.GetLockInfoAsync())?.LockToken;
if (content != null)
{
long contentLength = content != null ? content.Length : 0;
IWebRequestAsync request = await Program.DavClient.GetFileWriteRequestAsync(
new Uri(RemoteStoragePath), null, contentLength, 0, -1, lockToken, oldEtag);
// Update remote storage file content.
using (Stream davContentStream = await request.GetRequestStreamAsync())
{
if (content != null)
{
await content.CopyToAsync(davContentStream);
}
// Get the new ETag returned by the server (if any).
IWebResponseAsync response = await request.GetResponseAsync();
string eTagNew = response.Headers["ETag"];
response.Close();
// Store ETag unlil the next update.
// This will also mark the item as not new, which is required for correct MS Office saving opertions.
await customDataManager.ETagManager.SetETagAsync(eTagNew);
// Update ETag in custom column displayed in file manager.
await customDataManager.SetCustomColumnsAsync(new[] { new FileSystemItemPropertyData((int)CustomColumnIds.ETag, eTagNew) });
}
}
}
/// <inheritdoc/>
public async Task <byte[]> CreateFileAsync(IFileMetadata fileMetadata, Stream content = null)
{
string userFileSystemNewItemPath = Path.Combine(UserFileSystemPath, fileMetadata.Name);
Logger.LogMessage($"{nameof(IFolder)}.{nameof(CreateFileAsync)}()", userFileSystemNewItemPath);
Uri newFileUri = new Uri(new Uri(RemoteStoragePath), fileMetadata.Name);
long contentLength = content != null ? content.Length : 0;
IWebRequestAsync request = await Program.DavClient.GetFileWriteRequestAsync(newFileUri, null, contentLength);
// Update remote storage file content.
using (Stream davContentStream = await request.GetRequestStreamAsync())
{
if (content != null)
{
await content.CopyToAsync(davContentStream);
}
// Get the new ETag returned by the server (if any).
IWebResponseAsync response = await request.GetResponseAsync();
string eTagNew = response.Headers["ETag"];
response.Close();
ExternalDataManager customDataManager = Engine.CustomDataManager(userFileSystemNewItemPath);
// Store ETag unlil the next update.
// This will also mark the item as not new, which is required for correct MS Office saving opertions.
await customDataManager.ETagManager.SetETagAsync(eTagNew);
customDataManager.IsNew = false; // Mark file as not new just in case the server did not return the ETag.
// Update ETag in custom column displayed in file manager.
await customDataManager.SetCustomColumnsAsync(new[] { new FileSystemItemPropertyData((int)CustomColumnIds.ETag, eTagNew) });
}
return(null);
}
/// <summary>
/// Creates or updates file in the remote storage.
/// </summary>
/// <param name="remoteStorageUri">Uri of the file to be created or updated in the remote storage.</param>
/// <param name="newInfo">New information about the file, such as modification date, attributes, custom data, etc.</param>
/// <param name="mode">Specifies if a new file should be created or existing file should be updated.</param>
/// <param name="content">New file content or null if the file content is not modified.</param>
/// <param name="lockInfo">Information about the lock. Caller passes null if the item is not locked.</param>
/// <returns>New ETag returned from the remote storage.</returns>
protected async Task <string> CreateOrUpdateFileAsync(Uri remoteStorageUri, IFileBasicInfo newInfo, FileMode mode, Stream content = null, ServerLockInfo lockInfo = null)
{
string eTag = null;
string lockToken = null;
// Get ETag and lock-token here and send it to the remote storage with the new item content/info.
if (mode == FileMode.Open)
{
// Get ETag.
eTag = await ETag.GetETagAsync(UserFileSystemPath);
// Get lock-token.
lockToken = lockInfo?.LockToken;
}
if (content != null || mode == FileMode.CreateNew)
{
long contentLength = content != null ? content.Length : 0;
IWebRequestAsync request = await Program.DavClient.GetFileWriteRequestAsync(remoteStorageUri, null, contentLength, 0, -1, lockToken, eTag);
// Update remote storage file content.
using (Stream davContentStream = await request.GetRequestStreamAsync())
{
if (content != null)
{
await content.CopyToAsync(davContentStream);
}
// Get ETag returned by the server, if any.
IWebResponseAsync response = await request.GetResponseAsync();
eTag = response.Headers["ETag"];
response.Close();
}
}
return(eTag);
}
