Unicode C++

Get eBay Application Token

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This example shows how to request an eBay Application token. Unicode C++

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

void ChilkatSample(void)
    {
    bool success = false;

    //  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");

    const wchar_t *endPoint = L"https://api.sandbox.ebay.com/identity/v1/oauth2/token";
    req.put_ContentType(L"application/x-www-form-urlencoded");

    CkHttpResponseW resp;
    success = http.HttpReq(endPoint,req,resp);
    if (success == false) {
        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;
    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.
    //
    }