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(MFC) Xero API through an HTTP Proxy

This example demonstrates connecting through an HTTP proxy 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 <CkRest.h>
#include <CkSocket.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

    // 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;

    // Connect to the Xero server through an HTTP proxy, and then tell the REST object
    // to use the socket connection.
    CkSocket socket;

    // Set the HTTP proxy domain or IP address, and port.
    socket.put_HttpProxyHostname("192.168.1.100");
    socket.put_HttpProxyPort(8088);

    // Connect through the HTTP proxy..
    bool bTls = true;
    int port = 443;
    int maxWaitMs = 5000;
    bool success = socket.Connect("api.xero.com",port,bTls,maxWaitMs);
    if (success != true) {
        strOut.append("Connect Failure Error Code: ");
        strOut.appendInt(socket.get_ConnectFailReason());
        strOut.append("\r\n");
        strOut.append(socket.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Use the HTTP proxied TLS connection:
    success = rest.UseConnection(socket,true);
    if (success != true) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // OK, we're connected.  
    // The UseConnection method has an internal reference to the underlying/internal socket.
    // The application can does not need to keep its socket object in existence.
    // -----------------------------------------------------------------
    // 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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