(Node.js) SFTP Resume Upload

Demonstrates how to resume an SFTP upload to an SSH server. The ResumeUploadFileByName method checks the size of the file on the remote server and begins uploading from the appropriate position in the local file.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node11-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node11-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node11-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node11-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node11-linux64');
    }
} else if (os.platform() == 'darwin') {
    var chilkat = require('@chilkat/ck-node11-macosx');
}

function chilkatExample() {

    // Important: It is helpful to send the contents of the
    // sftp.LastErrorText property when requesting support.

    var sftp = new chilkat.SFtp();

    // Any string automatically begins a fully-functional 30-day trial.
    var success = sftp.UnlockComponent("Anything for 30-day trial");
    if (success !== true) {
        console.log(sftp.LastErrorText);
        return;
    }

    // Set some timeouts, in milliseconds:
    sftp.ConnectTimeoutMs = 5000;
    sftp.IdleTimeoutMs = 10000;

    // Connect to the SSH server.  
    // The standard SSH port = 22
    // The hostname may be a hostname or IP address.
    var port;
    var hostname;
    hostname = "www.my-ssh-server.com";
    port = 22;
    success = sftp.Connect(hostname,port);
    if (success !== true) {
        console.log(sftp.LastErrorText);
        return;
    }

    // Authenticate with the SSH server.  Chilkat SFTP supports
    // both password-based authenication as well as public-key
    // authentication.  This example uses password authenication.
    success = sftp.AuthenticatePw("myLogin","myPassword");
    if (success !== true) {
        console.log(sftp.LastErrorText);
        return;
    }

    // After authenticating, the SFTP subsystem must be initialized:
    success = sftp.InitializeSftp();
    if (success !== true) {
        console.log(sftp.LastErrorText);
        return;
    }

    // Upload from the local file to the SSH server.
    // Important -- the remote filepath is the 1st argument,
    // the local filepath is the 2nd argument;
    var remoteFilePath = "hamlet.xml";
    var localFilePath = "c:/temp/hamlet.xml";

    // The ResumeUploadFileByName method first gets the size
    // of the partial file on the server and then begins uploading
    // from the appropriate point in the local file.
    // If the remote file does not exist or is 0-length, this
    // method is equivalent to UploadFileByName.
    // If the remote file is already equal to or larger in size
    // than the local file, then nothing more is uploaded.
    success = sftp.ResumeUploadFileByName(remoteFilePath,localFilePath);
    if (success !== true) {
        console.log(sftp.LastErrorText);
        return;
    }

    console.log("Success.");

}

chilkatExample();