1 /* 2 * Copyright 2020 The gRPC Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package io.grpc; 18 19 import static java.util.Collections.unmodifiableList; 20 21 import java.util.ArrayList; 22 import java.util.Arrays; 23 import java.util.List; 24 25 /** 26 * Provides a list of {@link ChannelCredentials}, where any one may be used. The credentials are in 27 * preference order. 28 */ 29 public final class ChoiceChannelCredentials extends ChannelCredentials { 30 /** 31 * Constructs with the provided {@code creds} as options, with preferred credentials first. 32 * 33 * @throws IllegalArgumentException if no creds are provided 34 */ create(ChannelCredentials... creds)35 public static ChannelCredentials create(ChannelCredentials... creds) { 36 if (creds.length == 0) { 37 throw new IllegalArgumentException("At least one credential is required"); 38 } 39 for (ChannelCredentials cred : creds) { 40 if (cred == null) { 41 throw new NullPointerException(); 42 } 43 } 44 return new ChoiceChannelCredentials(unmodifiableList(new ArrayList<>(Arrays.asList(creds)))); 45 } 46 47 private final List<ChannelCredentials> creds; 48 ChoiceChannelCredentials(List<ChannelCredentials> creds)49 private ChoiceChannelCredentials(List<ChannelCredentials> creds) { 50 this.creds = creds; 51 } 52 53 /** Non-empty list of credentials, in preference order. */ getCredentialsList()54 public List<ChannelCredentials> getCredentialsList() { 55 return creds; 56 } 57 58 @Override withoutBearerTokens()59 public ChannelCredentials withoutBearerTokens() { 60 List<ChannelCredentials> credsWithoutTokens = new ArrayList<>(); 61 for (ChannelCredentials cred : creds) { 62 credsWithoutTokens.add(cred.withoutBearerTokens()); 63 } 64 return new ChoiceChannelCredentials(unmodifiableList(credsWithoutTokens)); 65 } 66 } 67