/*
* Copyright 2002-2017 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
*
* 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.springframework.web.reactive.function.client;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import reactor.core.publisher.Mono;
import org.springframework.http.HttpHeaders;
import org.springframework.util.Assert;
/**
* Implementations of {@link ExchangeFilterFunction} that provide various useful request filter
* operations, such as basic authentication, error handling, etc.
*
* @author Rob Winch
* @author Arjen Poutsma
* @since 5.0
*/
public abstract class ExchangeFilterFunctions {
/**
* Return a filter that adds an Authorization header for HTTP Basic Authentication.
* @param username the username to use
* @param password the password to use
* @return the {@link ExchangeFilterFunction} that adds the Authorization header
*/
public static ExchangeFilterFunction basicAuthentication(String username, String password) {
Assert.notNull(username, "'username' must not be null");
Assert.notNull(password, "'password' must not be null");
return ExchangeFilterFunction.ofRequestProcessor(
clientRequest -> {
String authorization = authorization(username, password);
ClientRequest authorizedRequest = ClientRequest.from(clientRequest)
.header(HttpHeaders.AUTHORIZATION, authorization)
.build();
return Mono.just(authorizedRequest);
});
}
private static String authorization(String username, String password) {
String credentials = username + ":" + password;
byte[] credentialBytes = credentials.getBytes(StandardCharsets.ISO_8859_1);
byte[] encodedBytes = Base64.getEncoder().encode(credentialBytes);
String encodedCredentials = new String(encodedBytes, StandardCharsets.ISO_8859_1);
return "Basic " + encodedCredentials;
}
}