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(C) 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

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#include <C_CkRest.h>
#include <C_CkSocket.h>
#include <C_CkPfx.h>
#include <C_CkPrivateKey.h>
#include <C_CkOAuth1.h>
#include <C_CkStringBuilder.h>
#include <C_CkXml.h>

void ChilkatSample(void)
    {
    HCkRest rest;
    HCkSocket socket;
    BOOL bTls;
    int port;
    int maxWaitMs;
    BOOL success;
    const char *consumerKey;
    const char *consumerSecret;
    HCkPfx pfx;
    HCkPrivateKey privKeyFromPfx;
    HCkPrivateKey privKeyFromPem;
    HCkOAuth1 oauth1;
    HCkStringBuilder sbXml;
    BOOL bAutoTrim;
    HCkXml xml;
    int recordCount;
    int i;

    // 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.
    rest = CkRest_Create();

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

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

    // Connect through the HTTP proxy..
    bTls = TRUE;
    port = 443;
    maxWaitMs = 5000;
    success = CkSocket_Connect(socket,"api.xero.com",port,bTls,maxWaitMs);
    if (success != TRUE) {
        printf("Connect Failure Error Code: %d\n",CkSocket_getConnectFailReason(socket));
        printf("%s\n",CkSocket_lastErrorText(socket));
        CkRest_Dispose(rest);
        CkSocket_Dispose(socket);
        return;
    }

    // Use the HTTP proxied TLS connection:
    success = CkRest_UseConnection(rest,socket,TRUE);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        CkSocket_Dispose(socket);
        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..

    consumerKey = "XERO_PRIVATE_APP_KEY";
    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.
    pfx = CkPfx_Create();
    success = CkPfx_LoadPfxFile(pfx,"qa_data/certs/xero_private_app/public_privatekey.pfx","PFX_PASSWORD");
    if (success != TRUE) {
        printf("%s\n",CkPfx_lastErrorText(pfx));
        CkRest_Dispose(rest);
        CkSocket_Dispose(socket);
        CkPfx_Dispose(pfx);
        return;
    }

    privKeyFromPfx = CkPfx_GetPrivateKey(pfx,0);
    if (CkPfx_getLastMethodSuccess(pfx) != TRUE) {
        printf("%s\n",CkPfx_lastErrorText(pfx));
        CkRest_Dispose(rest);
        CkSocket_Dispose(socket);
        CkPfx_Dispose(pfx);
        return;
    }

    // Or we can load from a PEM..
    privKeyFromPem = CkPrivateKey_Create();
    success = CkPrivateKey_LoadPemFile(privKeyFromPem,"qa_data/certs/xero_private_app/privatekey.pem");
    if (success != TRUE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKeyFromPem));
        CkRest_Dispose(rest);
        CkSocket_Dispose(socket);
        CkPfx_Dispose(pfx);
        CkPrivateKey_Dispose(privKeyFromPem);
        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).

    oauth1 = CkOAuth1_Create();
    CkOAuth1_putConsumerKey(oauth1,consumerKey);
    CkOAuth1_putConsumerSecret(oauth1,consumerSecret);
    CkOAuth1_putToken(oauth1,consumerKey);
    CkOAuth1_putTokenSecret(oauth1,consumerSecret);
    CkOAuth1_putSignatureMethod(oauth1,"RSA-SHA1");
    CkOAuth1_SetRsaKey(oauth1,privKeyFromPfx);
    CkPrivateKey_Dispose(privKeyFromPfx);

    // Install the OAuth1 authenticator.
    CkRest_SetAuthOAuth1(rest,oauth1,FALSE);

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

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

    // Get the full list of contacts.
    sbXml = CkStringBuilder_Create();
    success = CkRest_FullRequestNoBodySb(rest,"GET","/api.xro/2.0/Contacts",sbXml);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        CkSocket_Dispose(socket);
        CkPfx_Dispose(pfx);
        CkPrivateKey_Dispose(privKeyFromPem);
        CkOAuth1_Dispose(oauth1);
        CkStringBuilder_Dispose(sbXml);
        return;
    }

    // A 200 response is expected for actual success.
    if (CkRest_getResponseStatusCode(rest) != 200) {
        printf("%s\n",CkStringBuilder_getAsString(sbXml));
        CkRest_Dispose(rest);
        CkSocket_Dispose(socket);
        CkPfx_Dispose(pfx);
        CkPrivateKey_Dispose(privKeyFromPem);
        CkOAuth1_Dispose(oauth1);
        CkStringBuilder_Dispose(sbXml);
        return;
    }

    // Iterate over the contacts..
    bAutoTrim = FALSE;
    xml = CkXml_Create();
    CkXml_LoadSb(xml,sbXml,bAutoTrim);
    CkXml_SaveXml(xml,"qa_cache/xero_contacts.xml");

    // How many records exist?
    recordCount = CkXml_NumChildrenAt(xml,"Contacts");
    printf("numRecords = %d\n",recordCount);

    i = 0;
    while (i < recordCount) {
        CkXml_putI(xml,i);
        printf("ContactID: %s\n",CkXml_getChildContent(xml,"Contacts|Contact[i]|ContactID"));
        i = i + 1;
    }



    CkRest_Dispose(rest);
    CkSocket_Dispose(socket);
    CkPfx_Dispose(pfx);
    CkPrivateKey_Dispose(privKeyFromPem);
    CkOAuth1_Dispose(oauth1);
    CkStringBuilder_Dispose(sbXml);
    CkXml_Dispose(xml);

    }

 

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