src/main/java/org/apache/fineract/cn/api/util/UserContextHolder.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.fineract.cn.api.util;

import org.springframework.util.Assert;

import javax.annotation.Nonnull;
import java.util.Optional;

/**
 * @author Myrle Krantz
 */
@SuppressWarnings({"WeakerAccess", "unused"})
public class UserContextHolder {

  private static final InheritableThreadLocal<UserContext> THREAD_LOCAL = new InheritableThreadLocal<>();

  private UserContextHolder() {
  }

  @Nonnull
  public static String checkedGetAccessToken() {
    return Optional.ofNullable(UserContextHolder.THREAD_LOCAL.get())
            .map(UserContext::getAccessToken)
            .orElseThrow(IllegalStateException::new);
  }

  @Nonnull
  public static String checkedGetUser() {
    return Optional.ofNullable(UserContextHolder.THREAD_LOCAL.get())
            .map(UserContext::getUser)
            .map(UserContextHolder::cropIdentifier)
            .orElseThrow(IllegalStateException::new);
  }

  private static String cropIdentifier(final String identifier) {
    if (identifier.length() > 32)
      return identifier.substring(0, 32);
    else
      return identifier;
  }

  @Nonnull
  public static Optional<UserContext> getUserContext() {
    return Optional.ofNullable(UserContextHolder.THREAD_LOCAL.get());
  }

  public static void setAccessToken(@Nonnull final String user, @Nonnull final String accessToken) {
    Assert.notNull(user, "User may not be null.");
    Assert.notNull(accessToken, "Access token may not be null.");
    UserContextHolder.THREAD_LOCAL.set(new UserContext(user, accessToken));
  }

  public static void setUserContext(@Nonnull final UserContext userContext)
  {
    UserContextHolder.THREAD_LOCAL.set(userContext);
  }

  public static void clear() {
    UserContextHolder.THREAD_LOCAL.remove();
  }
}