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DelegatingOAuth2AuthorizedClientProvider.java
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DelegatingOAuth2AuthorizedClientProvider.java
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/*
* 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.security.oauth2.client;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/**
* An implementation of an {@link OAuth2AuthorizedClientProvider} that simply delegates
* to it's internal {@code List} of {@link OAuth2AuthorizedClientProvider}(s).
* <p>
* Each provider is given a chance to
* {@link OAuth2AuthorizedClientProvider#authorize(OAuth2AuthorizationContext) authorize}
* the {@link OAuth2AuthorizationContext#getClientRegistration() client} in the provided context
* with the first {@code non-null} {@link OAuth2AuthorizedClient} being returned.
*
* @author Joe Grandja
* @since 5.2
* @see OAuth2AuthorizedClientProvider
*/
public final class DelegatingOAuth2AuthorizedClientProvider implements OAuth2AuthorizedClientProvider {
private final List<OAuth2AuthorizedClientProvider> authorizedClientProviders;
/**
* Constructs a {@code DelegatingOAuth2AuthorizedClientProvider} using the provided parameters.
*
* @param authorizedClientProviders a list of {@link OAuth2AuthorizedClientProvider}(s)
*/
public DelegatingOAuth2AuthorizedClientProvider(OAuth2AuthorizedClientProvider... authorizedClientProviders) {
Assert.notEmpty(authorizedClientProviders, "authorizedClientProviders cannot be empty");
this.authorizedClientProviders = Collections.unmodifiableList(Arrays.asList(authorizedClientProviders));
}
/**
* Constructs a {@code DelegatingOAuth2AuthorizedClientProvider} using the provided parameters.
*
* @param authorizedClientProviders a {@code List} of {@link OAuth2AuthorizedClientProvider}(s)
*/
public DelegatingOAuth2AuthorizedClientProvider(List<OAuth2AuthorizedClientProvider> authorizedClientProviders) {
Assert.notEmpty(authorizedClientProviders, "authorizedClientProviders cannot be empty");
this.authorizedClientProviders = Collections.unmodifiableList(new ArrayList<>(authorizedClientProviders));
}
@Override
@Nullable
public OAuth2AuthorizedClient authorize(OAuth2AuthorizationContext context) {
Assert.notNull(context, "context cannot be null");
final List<OAuth2AuthorizedClient> clients = new ArrayList<>();
for (OAuth2AuthorizedClientProvider authorizedClientProvider: authorizedClientProviders) {
final OAuth2AuthorizedClient auth2AuthorizedClient = authorizedClientProvider.authorize(context);
if (auth2AuthorizedClient != null) {
clients.add(auth2AuthorizedClient);
}
}
if (!clients.isEmpty()) {
return clients.get(0);
} else {
return null;
}
}
}