Java tutorial
/* * Copyright 2002-2019 the original author or authors. * * Licensed 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 * * https://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.springframework.http.client.support; import java.io.IOException; import java.nio.charset.Charset; import org.springframework.http.HttpHeaders; import org.springframework.http.HttpRequest; import org.springframework.http.client.ClientHttpRequestExecution; import org.springframework.http.client.ClientHttpRequestInterceptor; import org.springframework.http.client.ClientHttpResponse; import org.springframework.lang.Nullable; /** * {@link ClientHttpRequestInterceptor} to apply a given HTTP Basic Authentication * username/password pair, unless a custom {@code Authorization} header has * already been set. * * @author Juergen Hoeller * @author Sam Brannen * @since 5.1.1 * @see HttpHeaders#setBasicAuth * @see HttpHeaders#AUTHORIZATION */ public class BasicAuthenticationInterceptor implements ClientHttpRequestInterceptor { private final String encodedCredentials; /** * Create a new interceptor which adds Basic Authentication for the * given username and password. * @param username the username to use * @param password the password to use * @see HttpHeaders#setBasicAuth(String, String) * @see HttpHeaders#encodeBasicAuth(String, String, Charset) */ public BasicAuthenticationInterceptor(String username, String password) { this(username, password, null); } /** * Create a new interceptor which adds Basic Authentication for the * given username and password, encoded using the specified charset. * @param username the username to use * @param password the password to use * @param charset the charset to use * @see HttpHeaders#setBasicAuth(String, String, Charset) * @see HttpHeaders#encodeBasicAuth(String, String, Charset) */ public BasicAuthenticationInterceptor(String username, String password, @Nullable Charset charset) { this.encodedCredentials = HttpHeaders.encodeBasicAuth(username, password, charset); } @Override public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException { HttpHeaders headers = request.getHeaders(); if (!headers.containsKey(HttpHeaders.AUTHORIZATION)) { headers.setBasicAuth(this.encodedCredentials); } return execution.execute(request, body); } }