(C) Get eBay Application Token

This example shows how to request an eBay Application token.

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

void ChilkatSample(void)
    {
    HCkHttp http;
    HCkHttpRequest req;
    const char *endPoint;
    HCkHttpResponse resp;
    HCkJsonObject json;
    const char *accessToken;
    HCkDateTime dtExpire;
    HCkFileAccess fac;
    BOOL success;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // See the Ebay documentation about Access token types
    // Also see the Ebay documentation about client credentials grant flow

    http = CkHttp_Create();

    // If using the sandbox, the target endpoint will be:
    // POST https://api.sandbox.ebay.com/identity/v1/oauth2/token

    // If using the production (live) system, the target endpoint will be:
    // POST https://api.ebay.com/identity/v1/oauth2/token

    // The eBay client_id and client_secret needs to be sent
    // in a Basic Authorization  request header, which has this format:
    // Authorization: Basic <B64_encoded_oauth_credentials>

    // Chilkat takes care of it.  You only need to set the Login = client_id,
    // and password = client_secret, and indicate you want "Basic" HTTP Authorization.
    CkHttp_putLogin(http,"EBAY_CLIENT_ID");
    CkHttp_putPassword(http,"EBAY_CLIENT_SECRET");
    CkHttp_putBasicAuth(http,TRUE);

    // Let's do the following POST:

    //   HTTP method:   POST
    //   URL (Sandbox): https://api.sandbox.ebay.com/identity/v1/oauth2/token
    // 
    //   HTTP headers:
    //     Content-Type = application/x-www-form-urlencoded
    //     Authorization = Basic <B64-encoded-oauth-credentials>
    // 
    //   Request body (wrapped for readability):
    //     grant_type=client_credentials&
    //     redirect_uri=<RuName-value>&
    //     scope=<SPACE separated list of scopes>
    // 

    // Create an HttpRequest object to hold the request params.
    req = CkHttpRequest_Create();
    CkHttpRequest_putHttpVerb(req,"POST");
    CkHttpRequest_AddParam(req,"grant_type","client_credentials");

    // The scope query param indicates the access to be provided by the token.
    // Multiple scopes can be specified by separating each with a SPACE char.
    // See the Ebay OAuth scopes documentation

    CkHttpRequest_AddParam(req,"scope","https://api.ebay.com/oauth/api_scope");

    // (The PostUrlEncoded method automatically sets the Content-Type header equal to "application/x-www-form-urlencoded")
    endPoint = "https://api.sandbox.ebay.com/identity/v1/oauth2/token";
    resp = CkHttp_PostUrlEncoded(http,endPoint,req);
    if (CkHttp_getLastMethodSuccess(http) != TRUE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        return;
    }

    // The response is JSON..
    json = CkJsonObject_Create();
    CkJsonObject_Load(json,CkHttpResponse_bodyStr(resp));
    CkJsonObject_putEmitCompact(json,FALSE);

    // If the response status code is not 200, then it failed.
    printf("Response status code = %d\n",CkHttpResponse_getStatusCode(resp));
    if (CkHttpResponse_getStatusCode(resp) != 200) {
        printf("%s\n",CkJsonObject_emit(json));
        printf("Failed.\n");
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkJsonObject_Dispose(json);
        return;
    }

    // We successfully retrieved an eBay access token.
    // The actual access token string can be parsed from the JSON like this:
    accessToken = CkJsonObject_stringOf(json,"access_token");

    // This application token is only valid for 7200 seconds (2 hours).  We'll want to refresh
    // it before it expires.  (There is an online example for that..)
    // For now, let's save the JSON to a file for our application to use.

    // But before doing that, let's add to the JSON an expiration timestamp
    // so we know when to refresh the token.
    dtExpire = CkDateTime_Create();
    CkDateTime_SetFromCurrentSystemTime(dtExpire);
    CkDateTime_AddSeconds(dtExpire,CkJsonObject_IntOf(json,"expires_in"));
    CkJsonObject_AppendString(json,"expire_time",CkDateTime_getAsTimestamp(dtExpire,FALSE));

    // Persist the JSON to a file.
    fac = CkFileAccess_Create();
    success = CkFileAccess_WriteEntireTextFile(fac,"qa_data/tokens/ebay.json",CkJsonObject_emit(json),"utf-8",FALSE);
    if (success != TRUE) {
        printf("%s\n",CkFileAccess_lastErrorText(fac));
        printf("Failed to save eBay Application token to file.\n");
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkJsonObject_Dispose(json);
        CkDateTime_Dispose(dtExpire);
        CkFileAccess_Dispose(fac);
        return;
    }

    printf("%s\n",CkJsonObject_emit(json));
    printf("Success.\n");

    // The output of this example is:

    // 	{ 
    // 	  "access_token": "v^1.1#i^1#p^1#I^3#r^0# ... Ajp1BQhJDgAA",
    // 	  "token_type": "Application Access Token",
    // 	  "expires_in": 7200,
    // 	  "refresh_token": "N/A",
    // 	  "expire_time": "2017-04-16T14:44:20Z"
    // 	}
    // 
    // 	Success.
    // 


    CkHttp_Dispose(http);
    CkHttpRequest_Dispose(req);
    CkJsonObject_Dispose(json);
    CkDateTime_Dispose(dtExpire);
    CkFileAccess_Dispose(fac);

    }