/**
    * Licensed to jclouds, Inc. (jclouds) under one or more
    * contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  jclouds 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.jclouds.http.filters;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  import static org.jclouds.Constants.PROPERTY_CREDENTIAL;
  import static org.jclouds.Constants.PROPERTY_IDENTITY;
  
  import java.io.UnsupportedEncodingException;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  import javax.ws.rs.core.HttpHeaders;
  
  import org.jclouds.crypto.Crypto;
  import org.jclouds.crypto.CryptoStreams;
  import org.jclouds.http.HttpException;
  import org.jclouds.http.HttpRequest;
  import org.jclouds.http.HttpRequestFilter;
  import org.jclouds.http.utils.ModifyRequest;
  
  /**
   * Uses Basic Authentication to sign the request.
   * 
   * @see <a href= "http://en.wikipedia.org/wiki/Basic_access_authentication" />
   * @author Adrian Cole
   * 
   */
  @Singleton
  public class BasicAuthentication implements HttpRequestFilter {
  
     private final String header;
  
     @Inject
     public BasicAuthentication(@Named(PROPERTY_IDENTITY) String user, @Named(PROPERTY_CREDENTIAL) String password,
           Crypto crypto) throws UnsupportedEncodingException {
        this.header = "Basic "
              + CryptoStreams.base64(String.format("%s:%s", checkNotNull(user, "user"),
                    checkNotNull(password, "password")).getBytes("UTF-8"));
     }
  
     @Override
     public HttpRequest filter(HttpRequest request) throws HttpException {
        return ModifyRequest.replaceHeader(request, HttpHeaders.AUTHORIZATION, header);
     }
  }