(C#) Calendar: Refresh Expired OAuth2 Access Token

Refreshes an expired OAuth2 access token.

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

Chilkat.JsonObject json = new Chilkat.JsonObject();
bool success = json.LoadFile("qa_data/tokens/msGraphCalendar.json");
if (success != true) {
    return;
}

Chilkat.HttpRequest req = new Chilkat.HttpRequest();
req.AddParam("grant_type","refresh_token");
req.AddParam("redirect_uri","http://localhost:3017/");
req.AddParam("client_id","MICROSOFT-GRAPH-CLIENT-ID");
req.AddParam("client_secret","MICROSOFT-GRAPH-CLIENT-SECRET");
req.AddParam("refresh_token",json.StringOf("refresh_token"));
req.AddParam("scope","openid profile offline_access user.readwrite calendars.readwrite files.readwrite");

Chilkat.Http http = new Chilkat.Http();

Chilkat.HttpResponse resp = http.PostUrlEncoded("https://login.microsoftonline.com/common/oauth2/v2.0/token",req);
if (http.LastMethodSuccess != true) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

// Load the JSON response.
json.Load(resp.BodyStr);
json.EmitCompact = false;

// Show the JSON response.
Debug.WriteLine(json.Emit());

Debug.WriteLine("Response status code: " + Convert.ToString(resp.StatusCode));

// If the response status code is not 200, then it's an error.
if (resp.StatusCode != 200) {
    return;
}

// Save the refreshed access token JSON to a file for future requests.
Chilkat.FileAccess fac = new Chilkat.FileAccess();
fac.WriteEntireTextFile("qa_data/tokens/msGraphCalendar.json",json.Emit(),"utf-8",false);

Debug.WriteLine("Success.");