(C) Twitter - Application Only Authentication

Demonstrates how to get a Twitter OAuth2 token for application-only authentication.

This example is deprecated and no longer valid.

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#include <C_CkHttp.h>
#include <C_CkHttpRequest.h>
#include <C_CkHttpResponse.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    const char *consumerKey;
    const char *consumerSecret;
    HCkHttp http;
    HCkHttpRequest req;
    HCkHttpResponse resp;
    HCkJsonObject json;

    // It requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Note: Define your Twitter apps at https://apps.twitter.com/

    // We're going to send an HTTPS POST that looks like this:

    // POST /oauth2/token HTTP/1.1
    // Host: api.twitter.com
    // User-Agent: My Twitter App v1.0.23
    // Authorization: Basic eHZ6MWV2RlM0d0VFUFRHRUZQSEJvZzpMOHFxOVBaeVJn
    //                      NmllS0dFS2hab2xHQzB2SldMdzhpRUo4OERSZHlPZw==
    // Content-Type: application/x-www-form-urlencoded;charset=UTF-8
    // Content-Length: 29
    // Accept-Encoding: gzip
    // 
    // grant_type=client_credentials

    // Update these values with your consumer key and secret (also known as API key and API secret).
    consumerKey = "TWITTER_CONSUMER_KEY";
    consumerSecret = "TWITTER_CONSUMER_SECRET";

    http = CkHttp_Create();

    CkHttp_putBasicAuth(http,TRUE);
    CkHttp_putLogin(http,consumerKey);
    CkHttp_putPassword(http,consumerSecret);

    req = CkHttpRequest_Create();
    CkHttpRequest_AddParam(req,"grant_type","client_credentials");

    resp = CkHttp_PostUrlEncoded(http,"https://api.twitter.com/oauth2/token",req);
    if (CkHttp_getLastMethodSuccess(http) != TRUE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        return;
    }

    printf("Response Status Code: %d\n",CkHttpResponse_getStatusCode(resp));

    if (CkHttpResponse_getStatusCode(resp) != 200) {
        printf("Expected a 200 response status code for success.\n");
        printf("%s\n",CkHttpResponse_bodyStr(resp));
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        return;
    }

    // We should get a JSON response like this:

    // {
    //     "token_type":"bearer",
    //     "access_token":"..."
    // }

    json = CkJsonObject_Create();
    CkJsonObject_Load(json,CkHttpResponse_bodyStr(resp));

    printf("Access token = %s\n",CkJsonObject_stringOf(json,"access_token"));

    CkHttpResponse_Dispose(resp);


    CkHttp_Dispose(http);
    CkHttpRequest_Dispose(req);
    CkJsonObject_Dispose(json);

    }