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Java library for Azure Service Bus

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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

package com.microsoft.azure.servicebus.security;

import java.text.ParseException;
import java.time.Instant;
import java.util.Date;
import java.util.concurrent.CompletableFuture;

/**
 * This is a token provider that obtains tokens from Azure Active Directory. It supports multiple modes of authentication with active directory
 * to obtain tokens.
 * @since 1.2.0
 *
 */
public class AzureActiveDirectoryTokenProvider extends TokenProvider {
    private final AuthenticationCallback authCallback;
    private final String authority;
    private final Object authCallbackState;
    
    AzureActiveDirectoryTokenProvider(AuthenticationCallback callback, String authority, Object callbackState) {
        this.authCallback = callback;
        this.authority = authority;
        this.authCallbackState = callbackState;
    }

    @Override
    public CompletableFuture getSecurityTokenAsync(String audience) {
        CompletableFuture tokenStringFuture = this.authCallback.acquireTokenAsync(
                SecurityConstants.SERVICEBUS_AAD_AUDIENCE_RESOURCE_URL, this.authority, this.authCallbackState);
        return tokenStringFuture.thenApply(tokenString -> {
            Date expire;
            try {
                expire = SecurityToken.getExpirationDateTimeUtcFromToken(tokenString);
                return new SecurityToken(SecurityTokenType.JWT, audience, tokenString, Instant.now(), expire == null ? null : expire.toInstant());
            } catch (ParseException e) {
                throw new RuntimeException(e);
            }
        });
    }
    
    @FunctionalInterface
    public interface AuthenticationCallback {
        /**
         * A user defined method for obtaining an access token.
         * @param audience The target resource that the access token will be granted for.
         * @param authority The resource that will validate the the access token.
         * @param state Parameter that may be used as part of the custom acquireToken process.
         * @return A CompletableFuture which returns a valid security token.
         */
        CompletableFuture acquireTokenAsync(String audience, String authority, Object state);
    }
}