(C) GeoOp Exchange Refresh Token for New Access Token

Demonstrates how to use the /oauth2/token endpoint to exchange it for a new access token once the current access token has expired.

Note: This example requires Chilkat v9.5.0.65 or greater.

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#include <C_CkJsonObject.h>
#include <C_CkRest.h>

void ChilkatSample(void)
    {
    HCkJsonObject jsonToken;
    BOOL success;
    HCkRest rest;
    BOOL bAutoReconnect;
    const char *responseBody;
    HCkJsonObject json;

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

    // This example also assumes that OAuth2 access and refresh tokens were previously fetched.
    // and saved in a JSON file.  

    // First get our previously obtained refresh token.
    // { .... "refresh_token":"e6dqdG....mzjpT04w==", .... }
    jsonToken = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(jsonToken,"qa_data/tokens/geoop.json");

    rest = CkRest_Create();

    // Connect to GeoOp...
    bAutoReconnect = TRUE;
    success = CkRest_Connect(rest,"login.geoop.com",443,TRUE,bAutoReconnect);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkJsonObject_Dispose(jsonToken);
        CkRest_Dispose(rest);
        return;
    }

    // Set the X-Version header.
    CkRest_AddHeader(rest,"X-Version","1.0");

    // Provide the required form params to get the new access token
    printf("refresh_token = %s\n",CkJsonObject_stringOf(jsonToken,"refresh_token"));
    CkRest_AddQueryParam(rest,"refresh_token",CkJsonObject_stringOf(jsonToken,"refresh_token"));
    CkRest_AddQueryParam(rest,"grant_type","refresh_token");
    CkRest_AddQueryParam(rest,"client_id","GEOOP-CLIENT-ID");
    CkRest_AddQueryParam(rest,"client_secret","GEOOP-CLIENT-SECRET");

    responseBody = CkRest_fullRequestFormUrlEncoded(rest,"POST","/oauth2/token");
    if (CkRest_getLastMethodSuccess(rest) != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkJsonObject_Dispose(jsonToken);
        CkRest_Dispose(rest);
        return;
    }

    // If the response status code did not indicate success, then see what happened..
    if (CkRest_getResponseStatusCode(rest) != 200) {
        printf("Request Header: \n");
        printf("%s\n",CkRest_lastRequestHeader(rest));
        printf("----\n");
        printf("Response StatusCode = %d\n",CkRest_getResponseStatusCode(rest));
        printf("Response StatusLine: %s\n",CkRest_responseStatusText(rest));
        printf("Response Header:\n");
        printf("%s\n",CkRest_responseHeader(rest));
        printf("%s\n",responseBody);
        CkJsonObject_Dispose(jsonToken);
        CkRest_Dispose(rest);
        return;
    }

    json = CkJsonObject_Create();
    CkJsonObject_putEmitCompact(json,FALSE);
    CkJsonObject_Load(json,responseBody);

    // Show the full JSON response.  It should contain the new access token...
    printf("%s\n",CkJsonObject_emit(json));


    CkJsonObject_Dispose(jsonToken);
    CkRest_Dispose(rest);
    CkJsonObject_Dispose(json);

    }