/*
 * Microsoft JDBC Driver for SQL Server Copyright(c) Microsoft Corporation All rights reserved. This program is made
 * available under the terms of the MIT License. See the LICENSE file in the project root for more information.
 */

package com.microsoft.sqlserver.jdbc;

import com.microsoft.aad.msal4j.ITokenCacheAccessAspect;
import com.microsoft.aad.msal4j.ITokenCacheAccessContext;


Access aspect for accessing the token cache.
MSAL token cache does not persist beyond lifetime of the application. This class implements the
ITokenCacheAccessAspect interface to persist the token cache between application instances so subsequent
authentications can use silent authentication if the user account is in the token cache.
See Also:
https://aka.ms/msal4j-token-cache/**
 * Access aspect for accessing the token cache.
 * 
 * MSAL token cache does not persist beyond lifetime of the application. This class implements the
 * ITokenCacheAccessAspect interface to persist the token cache between application instances so subsequent
 * authentications can use silent authentication if the user account is in the token cache.
 * 
 * @see <a href="https://aka.ms/msal4j-token-cache">https://aka.ms/msal4j-token-cache</a>
 */
public class PersistentTokenCacheAccessAspect implements ITokenCacheAccessAspect {
    private static PersistentTokenCacheAccessAspect instance = new PersistentTokenCacheAccessAspect();

    private PersistentTokenCacheAccessAspect() {};

    static PersistentTokenCacheAccessAspect getInstance() {
        return instance;
    }

    
Token cache in JSON format
/**
     * Token cache in JSON format
     */
    private String cache = null;

    @Override
    public synchronized void beforeCacheAccess(ITokenCacheAccessContext iTokenCacheAccessContext) {
        if (null != cache && null != iTokenCacheAccessContext && null != iTokenCacheAccessContext.tokenCache()) {
            iTokenCacheAccessContext.tokenCache().deserialize(cache);
        }
    }

    @Override
    public synchronized void afterCacheAccess(ITokenCacheAccessContext iTokenCacheAccessContext) {
        if (null != iTokenCacheAccessContext && iTokenCacheAccessContext.hasCacheChanged()
                && null != iTokenCacheAccessContext.tokenCache())
            cache = iTokenCacheAccessContext.tokenCache().serialize();
    }

    
Clears User token cache. This will clear all account info so interactive login will be required on the next
request to acquire an access token.
/**
     * Clears User token cache. This will clear all account info so interactive login will be required on the next
     * request to acquire an access token.
     */
    static void clearUserTokenCache() {
        if (null != instance.cache && !instance.cache.isEmpty()) {
            instance.cache = null;
        }
    }
}