JavaScript

Check if an FTP Listing Entry is a Symbolic Link

Demonstrates the Chilkat Ftp2.GetIsSymbolicLink method, which returns whether a cached directory-listing entry is a symbolic link. The only argument is a zero-based index. This information is available only when the server's listing format reports it.

Background: Symbolic links matter because following one can lead outside the expected directory or into a cycle, so recursive operations often need to identify and skip them. Unlike the file/directory distinction, symlink information is not always present — only listing formats that mark links (typically Unix-style LIST output) expose it, and this returns false when the server does not.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

JavaScript

var success = false;

//  Demonstrates the Ftp2.GetIsSymbolicLink method, which returns whether a cached directory-listing
//  entry is a symbolic link.  The only argument is a zero-based index.  This information is only
//  available when the server's listing format reports it.

var ftp = new CkFtp2();

ftp.Hostname = "ftp.example.com";
ftp.Username = "myFtpLogin";

//  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.
ftp.Password = "myPassword";

success = ftp.Connect();
if (success == false) {
    console.log(ftp.LastErrorText);
    return;
}

success = ftp.ChangeRemoteDir("public_html");
if (success == false) {
    console.log(ftp.LastErrorText);
    return;
}

//  GetDirCount retrieves the directory listing on the first call and returns the number of
//  entries.  A negative return indicates failure.
var n = ftp.GetDirCount();
if (n < 0) {
    console.log(ftp.LastErrorText);
    return;
}

var i;
for (i = 0; i <= n - 1; i++) {
    var name = ftp.GetFilename(i);
    if (ftp.GetIsSymbolicLink(i)) {
        console.log("[LINK] " + name);
    }
    else {
        console.log("       " + name);
    }

}

success = ftp.Disconnect();
if (success == false) {
    console.log(ftp.LastErrorText);
    return;
}