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(MFC) Xero API through an SSH Tunnel

This example demonstrates connecting through an SSH Tunnel w/ 2-legged OAuth for a Xero private application.

This example requires Chilkat v9.5.0.64 or later

Chilkat C/C++ Library Downloads

MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkSocket.h>
#include <CkRest.h>
#include <CkPfx.h>
#include <CkPrivateKey.h>
#include <CkOAuth1.h>
#include <CkStringBuilder.h>
#include <CkXml.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // This example requires Chilkat v9.5.0.64 or later

    CkSocket tunnel;

    const char *sshHostname = "www.my-ssh-server.com";
    int sshPort = 22;

    // Connect to an SSH server and establish the SSH tunnel:
    bool success = tunnel.SshOpenTunnel(sshHostname,sshPort);
    if (success != true) {
        strOut.append(tunnel.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Authenticate with the SSH server via a login/password
    // or with a public key.
    // This example demonstrates SSH password authentication.
    success = tunnel.SshAuthenticatePw("mySshLogin","mySshPassword");
    if (success != true) {
        strOut.append(tunnel.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  OK, the SSH tunnel is setup.  Now open a channel within the tunnel.
    //  (Any number of channels may be created from the same SSH tunnel.
    //  Multiple channels may coexist at the same time.)

    // This sample code would typically be placed in a subroutine or function
    // where the rest object is passed by reference.
    // It does the OAuth1 setup and makes the initial connection.
    CkRest rest;
    CkSocket *channel = 0;

    bool bTls = true;
    int port = 443;
    int maxWaitMs = 7000;

    // This returns a socket object that is a single channel within the SSH tunnel.
    channel = tunnel.SshOpenChannel("api.xero.com",port,bTls,maxWaitMs);
    if (tunnel.get_LastMethodSuccess() != true) {
        strOut.append(tunnel.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Use the connection.  (This connection is a TLS running on an SSH channel through an SSH tunnel.
    // In other words, TLS is wrapped within the SSH tunnel.)
    success = rest.UseConnection(*channel,true);
    if (success != true) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        delete channel;
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // OK, we're connected.  
    // -----------------------------------------------------------------
    // Now setup the OAuth1 authenticator..

    const char *consumerKey = "XERO_PRIVATE_APP_KEY";
    const char *consumerSecret = "XERO_PRIVATE_APP_SECRET";

    // Let's get our private key from our PFX (password protected), or the PEM (unprotected).
    // You can decide which to use.  Either is OK, although I would recommend keeping your
    // private keys in a PFX and not in an unprotected PEM.
    CkPfx pfx;
    success = pfx.LoadPfxFile("qa_data/certs/xero_private_app/public_privatekey.pfx","PFX_PASSWORD");
    if (success != true) {
        strOut.append(pfx.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkPrivateKey *privKeyFromPfx = pfx.GetPrivateKey(0);
    if (pfx.get_LastMethodSuccess() != true) {
        strOut.append(pfx.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Or we can load from a PEM..
    CkPrivateKey privKeyFromPem;
    success = privKeyFromPem.LoadPemFile("qa_data/certs/xero_private_app/privatekey.pem");
    if (success != true) {
        strOut.append(privKeyFromPem.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Note: There are many other means for loading a private key, including
    // from other formats and directly from memory (i.e. not file-based).

    CkOAuth1 oauth1;
    oauth1.put_ConsumerKey(consumerKey);
    oauth1.put_ConsumerSecret(consumerSecret);
    oauth1.put_Token(consumerKey);
    oauth1.put_TokenSecret(consumerSecret);
    oauth1.put_SignatureMethod("RSA-SHA1");
    oauth1.SetRsaKey(*privKeyFromPfx);
    delete privKeyFromPfx;

    // Install the OAuth1 authenticator.
    rest.SetAuthOAuth1(oauth1,false);

    strOut.append("OK, the Xero OAuth1 is initialized and the REST object is ready to make REST API calls..");
    strOut.append("\r\n");

    // -----------------------------------------------------------------
    // Make a call to verify that OAuth1 through an HTTP proxy works..

    // Get the full list of contacts.
    CkStringBuilder sbXml;
    success = rest.FullRequestNoBodySb("GET","/api.xro/2.0/Contacts",sbXml);
    if (success != true) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // A 200 response is expected for actual success.
    if (rest.get_ResponseStatusCode() != 200) {
        strOut.append(sbXml.getAsString());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Iterate over the contacts..
    bool bAutoTrim = false;
    CkXml xml;
    xml.LoadSb(sbXml,bAutoTrim);
    xml.SaveXml("qa_cache/xero_contacts.xml");

    // How many records exist?
    int recordCount = xml.NumChildrenAt("Contacts");
    strOut.append("numRecords = ");
    strOut.appendInt(recordCount);
    strOut.append("\r\n");

    int i = 0;
    while (i < recordCount) {
        xml.put_I(i);
        strOut.append("ContactID: ");
        strOut.append(xml.getChildContent("Contacts|Contact[i]|ContactID"));
        strOut.append("\r\n");
        i = i + 1;
    }



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }

 

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