(Objective-C) Microsoft Graph OAuth2 Client Credentials Grant Flow

Demonstrates how to get a Microsoft Graph access token using the Client Credentials Grant Flow.

You can use the OAuth 2.0 client credentials grant specified in RFC 6749, sometimes called two-legged OAuth, to access web-hosted resources by using the identity of an application. This type of grant is commonly used for server-to-server interactions that must run in the background, without immediate interaction with a user. These types of applications are often referred to as daemons or service accounts.

For more information, see https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow

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#import <CkoHttp.h>
#import <CkoHttpRequest.h>
#import <NSString.h>
#import <CkoHttpResponse.h>
#import <CkoJsonObject.h>

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

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

CkoHttpRequest *req = [[CkoHttpRequest alloc] init];
[req AddParam: @"client_secret" value: @"CLIENT_SECRET"];
[req AddParam: @"client_id" value: @"CLIENT_ID"];
// Don't know if the scopes valid for the client credentials grant are different than the scopes for the 3-legged Authorization Code Grant...
[req AddParam: @"scope" value: @"https://graph.microsoft.com/.default"];
[req AddParam: @"grant_type" value: @"client_credentials"];

// Use your own tenant ID, for example 4d8fdd66-66d1-43b0-ae5c-e31b4b7de5cd
NSString *url = @"https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token";
CkoHttpResponse *resp = [http PostUrlEncoded: url req: req];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

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

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json Load: resp.BodyStr];

json.EmitCompact = NO;
NSLog(@"%@",[json Emit]);

// Sample successful output:

// {
//   "token_type": "Bearer",
//   "expires_in": 3599,
//   "ext_expires_in": 3599,
//   "access_token": "eyJ0eX...K0jOERg"
// }

if (statusCode == 200) {
    [json WriteFile: @"qa_data/tokens/msGraphClientCredentialsToken.json"];
    NSLog(@"%@",@"Success.");
}
else {
    NSLog(@"%@",@"Failed.");
}