(Objective-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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#import <CkoJsonObject.h>
#import <CkoHttpRequest.h>
#import <CkoHttp.h>
#import <CkoHttpResponse.h>
#import <CkoFileAccess.h>

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

CkoJsonObject *json = [[CkoJsonObject alloc] init];
BOOL success = [json LoadFile: @"qa_data/tokens/msGraphGroup.json"];
if (success != YES) {
    return;
}

CkoHttpRequest *req = [[CkoHttpRequest alloc] init];
[req AddParam: @"grant_type" value: @"refresh_token"];
[req AddParam: @"redirect_uri" value: @"http://localhost:3017/"];
[req AddParam: @"client_id" value: @"MICROSOFT-GRAPH-CLIENT-ID"];
[req AddParam: @"client_secret" value: @"MICROSOFT-GRAPH-CLIENT-SECRET"];
[req AddParam: @"refresh_token" value: [json StringOf: @"refresh_token"]];
[req AddParam: @"scope" value: @"openid profile offline_access user.readwrite group.readwrite.all files.readwrite"];

CkoHttp *http = [[CkoHttp alloc] init];

CkoHttpResponse *resp = [http PostUrlEncoded: @"https://login.microsoftonline.com/common/oauth2/v2.0/token" req: req];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// Load the JSON response.
[json Load: resp.BodyStr];
json.EmitCompact = NO;

// Show the JSON response.
NSLog(@"%@",[json Emit]);

NSLog(@"%@%d",@"Response status code: ",[resp.StatusCode intValue]);

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

// Save the refreshed access token JSON to a file for future requests.
CkoFileAccess *fac = [[CkoFileAccess alloc] init];
[fac WriteEntireTextFile: @"qa_data/tokens/msGraphGroup.json" fileData: [json Emit] charset: @"utf-8" includePreamble: NO];

NSLog(@"%@",@"Success.");