/// <summary>
/// Checks if a file exists on the server.
/// </summary>
/// <param name="path">The full or relative path to the file</param>
/// <returns>True if the file exists</returns>
public bool FileExists(string path)
{
// verify args
if (path.IsBlank())
{
throw new ArgumentException("Required parameter is null or blank.", "path");
}
#if !CORE14
lock (m_lock) {
#endif
path = path.GetFtpPath();
LogFunc(nameof(FileExists), new object[] { path });
// calc the absolute filepath
path = GetAbsolutePath(path);
// since FTP does not include a specific command to check if a file exists
// here we check if file exists by attempting to get its filesize (SIZE)
if (HasFeature(FtpCapability.SIZE))
{
// Fix #328: get filesize in ASCII or Binary mode as required by server
var sizeReply = new FtpSizeReply();
GetFileSizeInternal(path, sizeReply, -1);
// handle known errors to the SIZE command
var sizeKnownError = CheckFileExistsBySize(sizeReply);
if (sizeKnownError.HasValue)
{
return(sizeKnownError.Value);
}
}
// check if file exists by attempting to get its date modified (MDTM)
if (HasFeature(FtpCapability.MDTM))
{
var reply = Execute("MDTM " + path);
var ch = reply.Code[0];
if (ch == '2')
{
return(true);
}
if (ch == '5' && reply.Message.IsKnownError(FtpServerStrings.fileNotFound))
{
return(false);
}
}
// check if file exists by getting a name listing (NLST)
var fileList = GetNameListing(path.GetFtpDirectoryName());
return(FileListings.FileExistsInNameListing(fileList, path));
#if !CORE14
}
#endif
}
/// <summary>
/// Checks if a file exists on the server asynchronously.
/// </summary>
/// <param name="path">The full or relative path to the file</param>
/// <param name="token">The token that can be used to cancel the entire process</param>
/// <returns>True if the file exists, false otherwise</returns>
public async Task <bool> FileExistsAsync(string path, CancellationToken token = default(CancellationToken))
{
// verify args
if (path.IsBlank())
{
throw new ArgumentException("Required parameter is null or blank.", "path");
}
path = path.GetFtpPath();
LogFunc(nameof(FileExistsAsync), new object[] { path });
// calc the absolute filepath
path = await GetAbsolutePathAsync(path, token);
// since FTP does not include a specific command to check if a file exists
// here we check if file exists by attempting to get its filesize (SIZE)
if (HasFeature(FtpCapability.SIZE))
{
// Fix #328: get filesize in ASCII or Binary mode as required by server
FtpSizeReply sizeReply = new FtpSizeReply();
await GetFileSizeInternalAsync(path, -1, token, sizeReply);
// handle known errors to the SIZE command
var sizeKnownError = CheckFileExistsBySize(sizeReply);
if (sizeKnownError.HasValue)
{
return(sizeKnownError.Value);
}
}
// check if file exists by attempting to get its date modified (MDTM)
if (HasFeature(FtpCapability.MDTM))
{
FtpReply reply = await ExecuteAsync("MDTM " + path, token);
var ch = reply.Code[0];
if (ch == '2')
{
return(true);
}
if (ch == '5' && reply.Message.IsKnownError(FtpServerStrings.fileNotFound))
{
return(false);
}
}
// check if file exists by getting a name listing (NLST)
string[] fileList = await GetNameListingAsync(path.GetFtpDirectoryName(), token);
return(FileListings.FileExistsInNameListing(fileList, path));
}
/// <summary>
/// Checks if a file exists on the server.
/// </summary>
/// <param name="path">The full or relative path to the file</param>
/// <returns>True if the file exists</returns>
public bool FileExists(string path)
{
// verify args
if (path.IsBlank())
{
throw new ArgumentException("Required parameter is null or blank.", "path");
}
#if !CORE14
lock (m_lock) {
#endif
path = path.GetFtpPath();
LogFunc(nameof(FileExists), new object[] { path });
// A check for path.StartsWith("/") tells us, even if it is z/OS, we can use the normal unix logic
// If z/OS: Do not GetAbsolutePath(), unless we have a leading slash
if (ServerType != FtpServer.IBMzOSFTP || path.StartsWith("/"))
{
// calc the absolute filepath
path = GetAbsolutePath(path);
}
// since FTP does not include a specific command to check if a file exists
// here we check if file exists by attempting to get its filesize (SIZE)
// If z/OS: Do not do SIZE, unless we have a leading slash
if (HasFeature(FtpCapability.SIZE) && (ServerType != FtpServer.IBMzOSFTP || path.StartsWith("/")))
{
// Fix #328: get filesize in ASCII or Binary mode as required by server
var sizeReply = new FtpSizeReply();
GetFileSizeInternal(path, sizeReply, -1);
// handle known errors to the SIZE command
var sizeKnownError = CheckFileExistsBySize(sizeReply);
if (sizeKnownError.HasValue)
{
return(sizeKnownError.Value);
}
}
// check if file exists by attempting to get its date modified (MDTM)
// If z/OS: Do not do MDTM, unless we have a leading slash
if (HasFeature(FtpCapability.MDTM) && (ServerType != FtpServer.IBMzOSFTP || path.StartsWith("/")))
{
var reply = Execute("MDTM " + path);
var ch = reply.Code[0];
if (ch == '2')
{
return(true);
}
if (ch == '5' && reply.Message.IsKnownError(FtpServerStrings.fileNotFound))
{
return(false);
}
}
// If z/OS: different handling, unless we have a leading slash
if (ServerType == FtpServer.IBMzOSFTP && !path.StartsWith("/"))
{
var fileList = GetNameListing(path);
return(fileList.Count() > 0);
}
else
// check if file exists by getting a name listing (NLST)
{
var fileList = GetNameListing(path.GetFtpDirectoryName());
return(FileListings.FileExistsInNameListing(fileList, path));
}
#if !CORE14
}
#endif
}