https://github.com/AzureAD/azure-activedirectory-library-for-java: Azure active directory library for Java gives you the ability to add Windows Azure Active Directory authentication to your web application with just a few lines of additional code. Using our ADAL SDKs you can quickly and easily extend your existing application to all the employees that use Windows Azure AD and Active Directory on-premises using Active Directory Federation Services, including Office365 customers.
  • MIT License
  • Microsoft Open Technologies, Inc. 
// Copyright (c) Microsoft Corporation.
// All rights reserved.
//
// This code is licensed under the MIT License.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files(the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions :
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package com.microsoft.aad.adal4j;

class AcquireDeviceCodeCallable extends AdalCallable<DeviceCode> {
    private String clientId;
    private String resource;

    AcquireDeviceCodeCallable(AuthenticationContext context,
                              String clientId, String resource,
                              AuthenticationCallback<DeviceCode> callback) {
        super(context, callback);
        this.headers = new ClientDataHttpHeaders(context.correlationId);
        this.clientId = clientId;
        this.resource = resource;
    }

    DeviceCode execute() throws Exception {
        context.authenticationAuthority.doInstanceDiscovery(headers.getReadonlyHeaderMap(),
                context.proxy, context.sslSocketFactory);
        return DeviceCodeRequest.execute(context.authenticationAuthority.getDeviceCodeEndpoint(),
                clientId, resource, headers.getReadonlyHeaderMap(), context.proxy, context.sslSocketFactory);
    }
}