Unicode C

Get eBay Application Token

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

#include <C_CkHttpW.h>
#include <C_CkHttpRequestW.h>
#include <C_CkHttpResponseW.h>
#include <C_CkJsonObjectW.h>
#include <C_CkDateTimeW.h>
#include <C_CkFileAccessW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkHttpW http;
    HCkHttpRequestW req;
    const wchar_t *endPoint;
    HCkHttpResponseW resp;
    HCkJsonObjectW json;
    const wchar_t *accessToken;
    HCkDateTimeW dtExpire;
    HCkFileAccessW fac;

    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

    http = CkHttpW_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.
    CkHttpW_putLogin(http,L"EBAY_CLIENT_ID");
    CkHttpW_putPassword(http,L"EBAY_CLIENT_SECRET");
    CkHttpW_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 = CkHttpRequestW_Create();
    CkHttpRequestW_putHttpVerb(req,L"POST");
    CkHttpRequestW_AddParam(req,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

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

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

    resp = CkHttpResponseW_Create();
    success = CkHttpW_HttpReq(http,endPoint,req,resp);
    if (success == FALSE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkHttpW_Dispose(http);
        CkHttpRequestW_Dispose(req);
        CkHttpResponseW_Dispose(resp);
        return;
    }

    //  The response is JSON..
    json = CkJsonObjectW_Create();
    CkJsonObjectW_Load(json,CkHttpResponseW_bodyStr(resp));
    CkJsonObjectW_putEmitCompact(json,FALSE);

    //  If the response status code is not 200, then it failed.
    wprintf(L"Response status code = %d\n",CkHttpResponseW_getStatusCode(resp));
    if (CkHttpResponseW_getStatusCode(resp) != 200) {
        wprintf(L"%s\n",CkJsonObjectW_emit(json));
        wprintf(L"Failed.\n");
        CkHttpW_Dispose(http);
        CkHttpRequestW_Dispose(req);
        CkHttpResponseW_Dispose(resp);
        CkJsonObjectW_Dispose(json);
        return;
    }

    //  We successfully retrieved an eBay access token.
    //  The actual access token string can be parsed from the JSON like this:
    accessToken = CkJsonObjectW_stringOf(json,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.
    dtExpire = CkDateTimeW_Create();
    CkDateTimeW_SetFromCurrentSystemTime(dtExpire);
    CkDateTimeW_AddSeconds(dtExpire,CkJsonObjectW_IntOf(json,L"expires_in"));
    CkJsonObjectW_AppendString(json,L"expire_time",CkDateTimeW_getAsTimestamp(dtExpire,FALSE));

    //  Persist the JSON to a file.
    fac = CkFileAccessW_Create();
    success = CkFileAccessW_WriteEntireTextFile(fac,L"qa_data/tokens/ebay.json",CkJsonObjectW_emit(json),L"utf-8",FALSE);
    if (success != TRUE) {
        wprintf(L"%s\n",CkFileAccessW_lastErrorText(fac));
        wprintf(L"Failed to save eBay Application token to file.\n");
        CkHttpW_Dispose(http);
        CkHttpRequestW_Dispose(req);
        CkHttpResponseW_Dispose(resp);
        CkJsonObjectW_Dispose(json);
        CkDateTimeW_Dispose(dtExpire);
        CkFileAccessW_Dispose(fac);
        return;
    }

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


    CkHttpW_Dispose(http);
    CkHttpRequestW_Dispose(req);
    CkHttpResponseW_Dispose(resp);
    CkJsonObjectW_Dispose(json);
    CkDateTimeW_Dispose(dtExpire);
    CkFileAccessW_Dispose(fac);

    }