/*
    * 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.syncope.core.rest.cxf.service;
  
  import java.util.Optional;
  import javax.ws.rs.core.HttpHeaders;
  import javax.ws.rs.core.MediaType;
  import javax.ws.rs.core.Response;
  import javax.ws.rs.core.StreamingOutput;
  import org.apache.commons.lang3.StringUtils;
  import org.apache.syncope.common.lib.saml2.SAML2LoginResponse;
  import org.apache.syncope.common.lib.saml2.SAML2Request;
  import org.apache.syncope.common.lib.saml2.SAML2Response;
  import org.apache.syncope.common.rest.api.service.SAML2SP4UIService;
  import org.apache.syncope.core.logic.SAML2SP4UILogic;
  import org.springframework.stereotype.Service;
  
  @Service
  public class SAML2SP4UIServiceImpl extends AbstractService implements SAML2SP4UIService {
  
      protected final SAML2SP4UILogic logic;
  
      public SAML2SP4UIServiceImpl(final SAML2SP4UILogic logic) {
          this.logic = logic;
      }
  
      @Override
      public Response getMetadata(final String spEntityID, final String urlContext) {
          StreamingOutput sout = (os) -> logic.getMetadata(StringUtils.appendIfMissing(spEntityID, "/"), urlContext, os);
  
          return Response.ok(sout).
                  type(MediaType.APPLICATION_XML).
                  build();
      }
  
      @Override
      public SAML2Request createLoginRequest(
              final String spEntityID, final String urlContext, final String idpEntityID) {
  
          return logic.createLoginRequest(
                  StringUtils.appendIfMissing(spEntityID, "/"),
                  urlContext,
                  idpEntityID);
      }
  
      @Override
      public SAML2LoginResponse validateLoginResponse(final SAML2Response reponse) {
          return logic.validateLoginResponse(reponse);
      }
  
      @Override
      public SAML2Request createLogoutRequest(final String spEntityID, final String urlContext) {
          return logic.createLogoutRequest(
                  getAccessToken(),
                  StringUtils.appendIfMissing(spEntityID, "/"),
                  urlContext);
      }
  
      @Override
      public void validateLogoutResponse(final SAML2Response response) {
          logic.validateLogoutResponse(response);
      }
  
      private String getAccessToken() {
          String auth = messageContext.getHttpHeaders().getHeaderString(HttpHeaders.AUTHORIZATION);
          String[] parts = Optional.ofNullable(auth).map(s -> s.split(" ")).orElse(null);
          if (parts == null || parts.length != 2 || !"Bearer".equals(parts[0])) {
              return null;
          }
  
          return parts[1];
      }
  }