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Resolve an Absolute Remote Path with SFTP RealPath

Demonstrates the Chilkat SFtp.RealPath method, which asks the server to canonicalize a path and returns the resulting absolute remote path. The first argument is the original path and the second is an optional compose path (SFTP v5 or later); pass an empty string when no composition is needed.

Background: The server — not the client — owns the remote filesystem's layout, so path canonicalization must happen on the server. RealPath resolves ., .., and symbolic links into a single absolute path, which is the reliable way to learn the session's home directory (canonicalize .) or to turn a relative path into an absolute one before storing or displaying it. On SFTP v5 and later, the compose path can additionally join or override the original.

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Local $bSuccess = False

;  Demonstrates the SFtp.RealPath method, which asks the server to canonicalize a path and
;  returns the resulting absolute remote path.  The 1st argument is the original path and the
;  2nd is an optional compose path (SFTP v5+), which may be an empty string.

$oSftp = ObjCreate("Chilkat.SFtp")

;  Step 1: Connect the SSH transport.  Port 22 is the usual port.
Local $iPort = 22
$bSuccess = $oSftp.Connect("sftp.example.com",$iPort)
If ($bSuccess = False) Then
    ConsoleWrite($oSftp.LastErrorText & @CRLF)
    Exit
EndIf

;  Normally you would not hard-code the password in source.  You should instead obtain it
;  from an interactive prompt, environment variable, or a secrets vault.
Local $sPassword = "mySshPassword"

$bSuccess = $oSftp.AuthenticatePw("mySshLogin",$sPassword)
If ($bSuccess = False) Then
    ConsoleWrite($oSftp.LastErrorText & @CRLF)
    Exit
EndIf

;  Step 3: Open the SFTP subsystem.  This must be done after authentication and before any
;  file or directory operations.
$bSuccess = $oSftp.InitializeSftp()
If ($bSuccess = False) Then
    ConsoleWrite($oSftp.LastErrorText & @CRLF)
    Exit
EndIf

;  Resolve "." to the absolute path of the session's default (home) directory.  No compose path
;  is needed, so the 2nd argument is an empty string.
Local $sHomeDir = $oSftp.RealPath(".","")
If ($oSftp.LastMethodSuccess = False) Then
    ConsoleWrite($oSftp.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Home directory: " & $sHomeDir & @CRLF)

;  Canonicalize a relative path with "..", resolving it to an absolute path.
Local $sResolved = $oSftp.RealPath("subdir/../otherdir","")
If ($oSftp.LastMethodSuccess = False) Then
    ConsoleWrite($oSftp.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Resolved path: " & $sResolved & @CRLF)

$oSftp.Disconnect