/*
    * ====================================================================
    * 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.hc.client5.testing.auth;
  
  import java.util.List;
  
  import org.apache.hc.core5.http.HttpException;
  import org.apache.hc.core5.http.NameValuePair;
  import org.apache.hc.core5.http.ProtocolException;
  
  abstract class AbstractAuthenticationHandler implements AuthenticationHandler<String> {
  
      abstract String getSchemeName();
  
      @Override
      public final String challenge(final List<NameValuePair> params) {
          final StringBuilder buf = new StringBuilder();
          buf.append(getSchemeName());
          if (params != null && params.size() > 0) {
              buf.append(" ");
              for (int i = 0; i < params.size(); i++) {
                  if (i > 0) {
                      buf.append(", ");
                  }
                  final NameValuePair param = params.get(i);
                  buf.append(param.getName()).append("=\"").append(param.getValue()).append("\"");
              }
          }
          return buf.toString();
      }
  
      abstract String decodeChallenge(String challenge);
  
      public final String extractAuthToken(final String challengeResponse) throws HttpException {
          final int i = challengeResponse.indexOf(' ');
          if (i == -1) {
              throw new ProtocolException("Invalid " + getSchemeName() + " challenge response");
          }
          final String schemeName = challengeResponse.substring(0, i);
          if (schemeName.equalsIgnoreCase(getSchemeName())) {
              final String s = challengeResponse.substring(i + 1).trim();
              try {
                  return decodeChallenge(s);
              } catch (final IllegalArgumentException ex) {
                  throw new ProtocolException("Malformed " + getSchemeName() + " credentials");
              }
          } else {
              throw new ProtocolException("Unexpected challenge type");
          }
      }
  
  }