(Unicode C++) Get eBay Application Token

This example shows how to request an eBay Application token.

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#include <CkHttpW.h>
#include <CkHttpRequestW.h>
#include <CkHttpResponseW.h>
#include <CkJsonObjectW.h>
#include <CkDateTimeW.h>
#include <CkFileAccessW.h>

void ChilkatSample(void)
    {
    // 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

    CkHttpW http;

    // 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.
    http.put_Login(L"EBAY_CLIENT_ID");
    http.put_Password(L"EBAY_CLIENT_SECRET");
    http.put_BasicAuth(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.
    CkHttpRequestW req;
    req.put_HttpVerb(L"POST");
    req.AddParam(L"grant_type",L"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

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

    // (The PostUrlEncoded method automatically sets the Content-Type header equal to "application/x-www-form-urlencoded")
    const wchar_t *endPoint = L"https://api.sandbox.ebay.com/identity/v1/oauth2/token";
    CkHttpResponseW *resp = http.PostUrlEncoded(endPoint,req);
    if (http.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    // The response is JSON..
    CkJsonObjectW json;
    json.Load(resp->bodyStr());
    json.put_EmitCompact(false);

    // If the response status code is not 200, then it failed.
    wprintf(L"Response status code = %d\n",resp->get_StatusCode());
    if (resp->get_StatusCode() != 200) {
        wprintf(L"%s\n",json.emit());
        wprintf(L"Failed.\n");
        return;
    }

    // We successfully retrieved an eBay access token.
    // The actual access token string can be parsed from the JSON like this:
    const wchar_t *accessToken = json.stringOf(L"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.
    CkDateTimeW dtExpire;
    dtExpire.SetFromCurrentSystemTime();
    dtExpire.AddSeconds(json.IntOf(L"expires_in"));
    json.AppendString(L"expire_time",dtExpire.getAsTimestamp(false));

    // Persist the JSON to a file.
    CkFileAccessW fac;
    bool success = fac.WriteEntireTextFile(L"qa_data/tokens/ebay.json",json.emit(),L"utf-8",false);
    if (success != true) {
        wprintf(L"%s\n",fac.lastErrorText());
        wprintf(L"Failed to save eBay Application token to file.\n");
        return;
    }

    wprintf(L"%s\n",json.emit());
    wprintf(L"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.
    // 
    }