001/*
002 * Copyright 2002-2016 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.http.client.support;
018
019import java.io.IOException;
020import java.nio.charset.Charset;
021
022import org.springframework.http.HttpRequest;
023import org.springframework.http.client.ClientHttpRequestExecution;
024import org.springframework.http.client.ClientHttpRequestInterceptor;
025import org.springframework.http.client.ClientHttpResponse;
026import org.springframework.util.Assert;
027import org.springframework.util.Base64Utils;
028
029/**
030 * {@link ClientHttpRequestInterceptor} to apply a BASIC authorization header.
031 *
032 * @author Phillip Webb
033 * @since 4.3.1
034 */
035public class BasicAuthorizationInterceptor implements ClientHttpRequestInterceptor {
036
037        private static final Charset UTF_8 = Charset.forName("UTF-8");
038
039        private final String username;
040
041        private final String password;
042
043
044        /**
045         * Create a new interceptor which adds a BASIC authorization header
046         * for the given username and password.
047         * @param username the username to use
048         * @param password the password to use
049         */
050        public BasicAuthorizationInterceptor(String username, String password) {
051                Assert.hasLength(username, "Username must not be empty");
052                this.username = username;
053                this.password = (password != null ? password : "");
054        }
055
056
057        @Override
058        public ClientHttpResponse intercept(HttpRequest request, byte[] body,
059                        ClientHttpRequestExecution execution) throws IOException {
060
061                String token = Base64Utils.encodeToString((this.username + ":" + this.password).getBytes(UTF_8));
062                request.getHeaders().add("Authorization", "Basic " + token);
063                return execution.execute(request, body);
064        }
065
066}