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/*
 * Licensed to The Apereo Foundation under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 *
 * The Apereo Foundation licenses this file to you under the Educational
 * Community 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://opensource.org/licenses/ecl2.txt
 *
 * 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.opencastproject.kernel.security;

import static org.opencastproject.kernel.security.DelegatingAuthenticationEntryPoint.INITIAL_REQUEST_PATH;

import org.opencastproject.security.api.Role;
import org.opencastproject.security.api.SecurityService;
import org.opencastproject.security.api.User;

import org.springframework.security.core.Authentication;

import java.io.IOException;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Sends authenticated users to one of the configured welcome pages after login.
 */
public class AuthenticationSuccessHandler implements
        org.springframework.security.web.authentication.AuthenticationSuccessHandler {

  /** The wildcard role matcher for welcome pages */
  public static final String WILDCARD = "*";

  /** The root resource */
  public static final String ROOT = "/";

  /** The security service */
  private SecurityService securityService = null;

  /** The maps of roles to welcome pages */
  private Map welcomePages = null;

  /**
   * {@inheritDoc}
   *
   * @see org.springframework.security.web.authentication.AuthenticationSuccessHandler#onAuthenticationSuccess(javax.servlet.http.HttpServletRequest,
   *      javax.servlet.http.HttpServletResponse, org.springframework.security.core.Authentication)
   */
  @Override
  public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response,
          Authentication authentication) throws IOException {

    if ("application/json".equalsIgnoreCase(request.getHeader("Accept"))) {
      response.sendRedirect("/info/me.json");
      return;
    }

    /* If the user originally attempted to access a specific URI other than /, but was forwarded to the login page,
     * redirect the user back to that initial URI. */
    HttpSession session = request.getSession();
    String initialRequestUri = (String) session.getAttribute(INITIAL_REQUEST_PATH);
    session.removeAttribute(INITIAL_REQUEST_PATH);
    if (initialRequestUri != null) {
      response.sendRedirect(initialRequestUri);
      return;
    }

    // If there are no configured welcome pages, send the user to /
    if (welcomePages == null || welcomePages.isEmpty()) {
      response.sendRedirect(ROOT);
      return;
    }

    // Look for a welcome page for one of this user's roles
    User currentUser = securityService.getUser();
    for (Role role : currentUser.getRoles()) {
      if (welcomePages.containsKey(role.getName())) {
        response.sendRedirect(welcomePages.get(role.getName()));
        return;
      }
    }

    // None of the user's roles are in the welcome pages map, so try the wildcard. If that's not present, redirect to /
    response.sendRedirect(welcomePages.getOrDefault(WILDCARD, ROOT));
  }

  /**
   * Sets the security service
   *
   * @param securityService
   *          the security service
   */
  public void setSecurityService(SecurityService securityService) {
    this.securityService = securityService;
  }

  /**
   * Sets the welcome pages mapping.
   *
   * @param welcomePages
   *          the welcomePages to set
   */
  public void setWelcomePages(Map welcomePages) {
    this.welcomePages = welcomePages;
  }
}