(Java) Azure AD Service-to-service access token request

Send an Azure AD service-to-service token request to get an access token using a shared secret.

For more information, see https://docs.microsoft.com/en-us/azure/active-directory/develop/v1-oauth2-client-creds-grant-flow#service-to-service-access-token-request

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();

    // To see the exact HTTP request sent and the response, set the SessionLogFilename property:
    http.put_SessionLogFilename("qa_output/chilkatHttpLog.txt");

    CkHttpRequest req = new CkHttpRequest();

    // Set the following request params:
    // grant_type 	required 	Specifies the requested grant type. In a Client Credentials Grant flow, the value must be client_credentials.
    // 
    // client_id 	required 	Specifies the Azure AD client id of the calling web service. 
    //     To find the calling application's client ID, in the Azure portal, click Azure Active Directory, click App registrations, click the application. 
    //     The client_id is the Application ID
    // 
    // client_secret 	required 	Enter a key registered for the calling web service or daemon application in Azure AD. 
    //     To create a key, in the Azure portal, click Azure Active Directory, click App registrations, click the application, click Settings, click Keys, and add a Key.
    //     URL-encode this secret when providing it.
    // 
    // resource 	required 	Enter the App ID URI of the receiving web service. To find the App ID URI, in the Azure portal, click Azure Active Directory, 
    //     click App registrations, click the service application, and then click Settings and Properties.

    req.AddParam("grant_type","client_credentials");
    req.AddParam("client_id","MY_CLIENT_ID");
    req.AddParam("client_secret","MY_CLIENT_SECRET");
    req.AddParam("resource","https://service.contoso.com/");

    // The URL passed to PostUrlEncoded has this form:   https://login.microsoftonline.com/<tenant_id>/oauth2/token
    CkHttpResponse resp = http.PostUrlEncoded("https://login.microsoftonline.com/<tenant_id>/oauth2/token",req);
    if (http.get_LastMethodSuccess() == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    int respStatusCode = resp.get_StatusCode();
    System.out.println("Response Status Code = " + respStatusCode);

    CkJsonObject json = new CkJsonObject();
    json.put_EmitCompact(false);
    json.Load(resp.bodyStr());
    System.out.println("Response JSON:");
    System.out.println(json.emit());

    if (respStatusCode >= 400) {
        System.out.println("Response Header:");
        System.out.println(resp.header());
        System.out.println("Failed.");

        return;
        }

    // Sample response:

    // {
    //   "token_type": "Bearer",
    //   "expires_in": "3599",
    //   "ext_expires_in": "3599",
    //   "expires_on": "1570059833",
    //   "not_before": "1570055933",
    //   "resource": "https://adminchilkatsoft.onmicrosoft.com/eb1b8ced-76b7-4845-aec5-d3e91776e345",
    //   "access_token": "eyJ0eXAiO ... pmgw"
    // }

    // To get the items from the JSON....
    String token_type = json.stringOf("token_type");
    String expires_in = json.stringOf("expires_in");
    String ext_expires_in = json.stringOf("ext_expires_in");
    String expires_on = json.stringOf("expires_on");
    String not_before = json.stringOf("not_before");
    String resource = json.stringOf("resource");
    String access_token = json.stringOf("access_token");
  }
}