/*
    * Copyright 2018 LINE Corporation
    *
    * LINE Corporation 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:
    *
    *   https://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 com.linecorp.centraldogma.server.auth.shiro;
  
  import static java.util.Objects.requireNonNull;
  
  import java.util.function.Function;
  
  import org.apache.shiro.config.Ini;
  
  import com.linecorp.centraldogma.server.auth.AuthConfig;
  import com.linecorp.centraldogma.server.auth.AuthProvider;
  import com.linecorp.centraldogma.server.auth.AuthProviderFactory;
  import com.linecorp.centraldogma.server.auth.AuthProviderParameters;
  
  /**
   * A factory for creating an Apache Shiro based {@link AuthProvider}.
   */
  public final class ShiroAuthProviderFactory implements AuthProviderFactory {
  
      private final Function<AuthConfig, Ini> iniConfigResolver;
  
      /**
       * Creates a new instance with the default {@link Ini} config resolver.
       */
      public ShiroAuthProviderFactory() {
          this(ShiroAuthProviderFactory::fromConfig);
      }
  
      /**
       * Creates a new instance with the specified {@code iniConfigResolver}.
       */
      public ShiroAuthProviderFactory(Function<AuthConfig, Ini> iniConfigResolver) {
          this.iniConfigResolver = requireNonNull(iniConfigResolver, "iniConfigResolver");
      }
  
      @Override
      public AuthProvider create(AuthProviderParameters parameters) {
          requireNonNull(parameters, "parameters");
          return new ShiroAuthProvider(parameters.authConfig(),
                                       iniConfigResolver.apply(parameters.authConfig()),
                                       parameters.sessionIdGenerator(),
                                       parameters.loginSessionPropagator(),
                                       parameters.logoutSessionPropagator());
      }
  
      private static Ini fromConfig(AuthConfig cfg) {
          try {
              final String iniPath = cfg.properties(String.class);
              return Ini.fromResourcePath(iniPath);
          } catch (Exception e) {
              throw new IllegalStateException("Failed to create " + Ini.class.getSimpleName(), e);
          }
      }
  }