(C) Calendar: Refresh Expired OAuth2 Access Token

Refreshes an expired OAuth2 access token.

Note: This example requires Chilkat v11.0.0 or greater.

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

    success = FALSE;

    // 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/msGraphCalendar.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 calendars.readwrite files.readwrite");

    http = CkHttp_Create();

    CkHttpRequest_putHttpVerb(req,"POST");
    CkHttpRequest_putContentType(req,"application/x-www-form-urlencoded");

    resp = CkHttpResponse_Create();
    success = CkHttp_HttpReq(http,"https://login.microsoftonline.com/common/oauth2/v2.0/token",req,resp);
    if (success == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkJsonObject_Dispose(json);
        CkHttpRequest_Dispose(req);
        CkHttp_Dispose(http);
        CkHttpResponse_Dispose(resp);
        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);
        CkHttpResponse_Dispose(resp);
        return;
    }

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

    printf("Success.\n");


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

    }