(Objective-C) Microsoft Teams OAuth2 Client Credentials Authentication

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Demonstrates how to authenticate with OAuth 2.0 using the client credentials grant type.

Note: This example uses the new "Integrated OAuth2 Client Credentials" feature introduced in Chilkat v9.5.0.96.

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

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

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

// Provide the information needed for Chilkat to automatically fetch the OAuth2.0 
// access token as needed.
// This is the new "Integrated OAuth2 Client Credentials" feature introduced in Chilkat v9.5.0.96.  
CkoJsonObject *jsonOAuthCC = [[CkoJsonObject alloc] init];

// --------------------------------------------------------------------------------------------------------
// You'll need to have registered an app in Azure beforehand.
// 
// Note: Creating a Team requires the following Application permissions:
// Team.Create, Teamwork.Migrate.All, Group.ReadWrite.All**, Directory.ReadWrite.All**
// 
// See How to Create an Azure App Registration for OAuth 2.0 Client Credentials
// --------------------------------------------------------------------------------------------------------

// Use the values from your App Registration in Azure.
[jsonOAuthCC UpdateString: @"client_id" value: @"e1cd2318-xxxx-4916-bfd6-xxxxxxxxxxxx"];
[jsonOAuthCC UpdateString: @"client_secret" value: @"K.d8Q~RoJxxxxvCj_u_xxxxxxxxxxxxxxxxxxxxx"];

// You'll always use this scope for client credentials, because the allowed actions
// are determined by the App Permissions defined when you registered the app in Azure.
[jsonOAuthCC UpdateString: @"scope" value: @"https://graph.microsoft.com/.default"];

// The token endpoint includes your tenant ID.  Use your tenant ID (not the tenant ID shown here).
[jsonOAuthCC UpdateString: @"token_endpoint" value: @"https://login.microsoftonline.com/112d7ed6-71bf-4eba-a866-738364321bfc/oauth2/v2.0/token"];

// Provide the OAuth2 information. Chilkat will use this information to automatically fetch the OAuth2 access token as needed,
http.AuthToken = [jsonOAuthCC Emit];

// ------------------------------------------------------------------------------
// To create a Microsoft Team, we want to send an HTTP request like the following:
// 
// Note: The following is the minimal JSON for a request using Applicaton permissions (i.e. the access token retrieved using the client credentials grant).
// 
// POST https://graph.microsoft.com/v1.0/teams
// Content-Type: application/json
// 
// {
//    "template@odata.bind":"https://graph.microsoft.com/v1.0/teamsTemplates('standard')",
//    "displayName":"My Sample Team",
//    "description":"My Sample Teams Description",
//    "members":[
//       {
//          "@odata.type":"#microsoft.graph.aadUserConversationMember",
//          "roles":[
//             "owner"
//          ],
//          "user@odata.bind":"https://graph.microsoft.com/v1.0/users('0040b377-61d8-43db-94f5-81374122dc7e')"
//       }
//    ]
// }

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateString: @"\"template@odata.bind\"" value: @"https://graph.microsoft.com/v1.0/teamsTemplates('standard')"];
[json UpdateString: @"displayName" value: @"My Sample Team"];
[json UpdateString: @"description" value: @"My Sample Teams Description"];
[json UpdateString: @"members[0].\"@odata.type\"" value: @"#microsoft.graph.aadUserConversationMember"];
[json UpdateString: @"members[0].roles[0]" value: @"owner"];
[json UpdateString: @"members[0].\"user@odata.bind\"" value: @"https://graph.microsoft.com/v1.0/users('4ee732c3-322e-4a6b-b729-2fd1eb5c6004')"];

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

[http SetRequestHeader: @"Content-type" value: @"application/json"];

CkoHttpResponse *resp = [http PostJson3: @"https://graph.microsoft.com/v1.0/teams" contentType: @"application/json" json: json];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// A successful response is indicated by a 202 response status code and an empty response body.
NSLog(@"%@%d",@"Response Status Code: ",[resp.StatusCode intValue]);
NSLog(@"%@",@"Response Body:");
NSLog(@"%@",resp.BodyStr);

if ([resp.StatusCode intValue] >= 400) {
    NSLog(@"%@",@"Response Header:");
    NSLog(@"%@",resp.Header);
    NSLog(@"%@",@"Failed.");
}