(C) Group: Refresh OAuth2 Access Token

Refreshes an expired or non-expired OAuth2 access token for the Microsoft Group REST API.

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

void ChilkatSample(void)
    {
    HCkJsonObject json;
    BOOL success;
    HCkHttpRequest req;
    HCkHttp http;
    HCkHttpResponse resp;
    HCkFileAccess fac;

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

    json = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(json,"qa_data/tokens/msGraphGroup.json");
    if (success != TRUE) {
        CkJsonObject_Dispose(json);
        return;
    }

    req = CkHttpRequest_Create();
    CkHttpRequest_AddParam(req,"grant_type","refresh_token");
    CkHttpRequest_AddParam(req,"redirect_uri","http://localhost:3017/");
    CkHttpRequest_AddParam(req,"client_id","MICROSOFT-GRAPH-CLIENT-ID");
    CkHttpRequest_AddParam(req,"client_secret","MICROSOFT-GRAPH-CLIENT-SECRET");
    CkHttpRequest_AddParam(req,"refresh_token",CkJsonObject_stringOf(json,"refresh_token"));
    CkHttpRequest_AddParam(req,"scope","openid profile offline_access user.readwrite group.readwrite.all files.readwrite");

    http = CkHttp_Create();

    resp = CkHttp_PostUrlEncoded(http,"https://login.microsoftonline.com/common/oauth2/v2.0/token",req);
    if (CkHttp_getLastMethodSuccess(http) != TRUE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkJsonObject_Dispose(json);
        CkHttpRequest_Dispose(req);
        CkHttp_Dispose(http);
        return;
    }

    // Load the JSON response.
    CkJsonObject_Load(json,CkHttpResponse_bodyStr(resp));
    CkJsonObject_putEmitCompact(json,FALSE);

    // Show the JSON response.
    printf("%s\n",CkJsonObject_emit(json));

    printf("Response status code: %d\n",CkHttpResponse_getStatusCode(resp));

    // If the response status code is not 200, then it's an error.
    if (CkHttpResponse_getStatusCode(resp) != 200) {
        CkJsonObject_Dispose(json);
        CkHttpRequest_Dispose(req);
        CkHttp_Dispose(http);
        return;
    }

    CkHttpResponse_Dispose(resp);

    // Save the refreshed access token JSON to a file for future requests.
    fac = CkFileAccess_Create();
    CkFileAccess_WriteEntireTextFile(fac,"qa_data/tokens/msGraphGroup.json",CkJsonObject_emit(json),"utf-8",FALSE);

    printf("Success.\n");


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

    }