(Android™) Microsoft Graph -- List Users (Automatic OAuth2 Client Credentials)

Simplify OAuth2 client credentials by using Chilkat to automatically obtain the necessary access token. This example demonstrates the technique with the Microsoft Graph API's "List Users" request.

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// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

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

    // Instead of directly sending a POST request to obtain an OAuth2 access token, 
    // you can provide Chilkat with the necessary information to automatically fetch 
    // the token using the Client Credentials flow. During the first HTTP request, 
    // Chilkat will obtain the token if it doesn't have one yet, and then use it for 
    // all subsequent requests. When the token is expired or about to expire, Chilkat 
    // will automatically obtain a new one, eliminating the need for your application 
    // to manage token expiration and renewal manually. This approach also reduces the 
    // number of HTTP requests by utilizing valid tokens as long as possible.

    CkJsonObject json = new CkJsonObject();
    json.UpdateString("client_secret","CLIENT_SECRET");
    json.UpdateString("client_id","CLIENT_ID");
    json.UpdateString("token_endpoint","https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token");
    json.UpdateString("scope","https://graph.microsoft.com/.default");

    CkHttp http = new CkHttp();

    // Provide the information to let Chilkat automatically obtain the access token.
    http.put_AuthToken(json.emit());

    CkStringBuilder sbResponse = new CkStringBuilder();

    boolean success = http.QuickGetSb("https://graph.microsoft.com/v1.0/users",sbResponse);
    if (success != true) {
        Log.i(TAG, http.lastErrorText());
        return;
        }

    json.LoadSb(sbResponse);
    json.put_EmitCompact(false);

    Log.i(TAG, "Status code = " + String.valueOf(http.get_LastStatus()));
    if (http.get_LastStatus() != 200) {
        Log.i(TAG, json.emit());
        Log.i(TAG, "Failed.");
        }

    Log.i(TAG, json.emit());

    // Sample output
    // {
    //   "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users",
    //   "value": [
    //     {
    //       "@odata.id": "https://graph.microsoft.com/v2/6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd/directoryObjects/fca490d8-5918-4201-8079-c5dcbeafcdc9/Microsoft.DirectoryServices.User",
    //       "businessPhones": [
    //       ],
    //       "displayName": "Joe Sample",
    //       "givenName": "Joe",
    //       "jobTitle": null,
    //       "mail": null,
    //       "mobilePhone": null,
    //       "officeLocation": null,
    //       "preferredLanguage": null,
    //       "surname": "Sample",
    //       "userPrincipalName": "admin_chilkatsoft.com#EXT#@adminchilkatsoft.onmicrosoft.com",
    //       "id": "fca490d8-5918-4201-8079-c5dcbeafcdc9"
    //     }
    //   ]
    // }

    // Use this online tool to generate parsing code from sample JSON: 
    // Generate Parsing Code from JSON

    String odata_id;
    String displayName;
    String givenName;
    String jobTitle;
    String mail;
    String mobilePhone;
    String officeLocation;
    String preferredLanguage;
    String surname;
    String userPrincipalName;
    String id;
    int j;
    int count_j;

    String odata_context = json.stringOf("\"@odata.context\"");
    int i = 0;
    int count_i = json.SizeOfArray("value");
    while (i < count_i) {
        json.put_I(i);
        odata_id = json.stringOf("value[i].\"@odata.id\"");
        displayName = json.stringOf("value[i].displayName");
        givenName = json.stringOf("value[i].givenName");
        jobTitle = json.stringOf("value[i].jobTitle");
        mail = json.stringOf("value[i].mail");
        mobilePhone = json.stringOf("value[i].mobilePhone");
        officeLocation = json.stringOf("value[i].officeLocation");
        preferredLanguage = json.stringOf("value[i].preferredLanguage");
        surname = json.stringOf("value[i].surname");
        userPrincipalName = json.stringOf("value[i].userPrincipalName");
        id = json.stringOf("value[i].id");
        j = 0;
        count_j = json.SizeOfArray("value[i].businessPhones");
        while (j < count_j) {
            json.put_J(j);
            j = j + 1;
            }

        i = i + 1;
        }


  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}