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ComputeEngineTokenProvider.java
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ComputeEngineTokenProvider.java
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/*
* Copyright 2017-2023 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 com.google.auth.oauth2;
import static com.google.auth.oauth2.Constants.ACCESS_TOKEN;
import static com.google.auth.oauth2.Constants.ERROR_PARSING_TOKEN_REFRESH_RESPONSE;
import static com.google.auth.oauth2.Constants.EXPIRES_IN;
import com.google.api.client.util.GenericData;
import java.io.IOException;
import java.util.Date;
import org.springframework.web.reactive.function.client.WebClient;
import reactor.core.publisher.Mono;
public class ComputeEngineTokenProvider implements ReactiveTokenProvider {
private final WebClient webClient;
private final ComputeEngineCredentials computeEngineCredentials;
private final String tokenUrl;
public ComputeEngineTokenProvider(
WebClient webClient, ComputeEngineCredentials computeEngineCredentials) {
this.webClient = webClient;
this.computeEngineCredentials = computeEngineCredentials;
tokenUrl = computeEngineCredentials.createTokenUrlWithScopes();
}
public ComputeEngineTokenProvider(
WebClient webClient, ComputeEngineCredentials computeEngineCredentials, String tokenUrl) {
this.webClient = webClient;
this.computeEngineCredentials = computeEngineCredentials;
this.tokenUrl = tokenUrl;
}
@Override
public Mono<AccessToken> retrieve() {
return webClient
.get()
.uri(tokenUrl)
.header("Metadata-Flavor", "Google")
.retrieve()
.bodyToMono(GenericData.class)
.flatMap(
gd -> {
try {
String tokenValue =
OAuth2Utils.validateString(
gd, ACCESS_TOKEN, ERROR_PARSING_TOKEN_REFRESH_RESPONSE);
int expiresInSeconds =
OAuth2Utils.validateInt32(gd, EXPIRES_IN, ERROR_PARSING_TOKEN_REFRESH_RESPONSE);
long expiresAtMilliseconds =
computeEngineCredentials.clock.currentTimeMillis() + (expiresInSeconds * 1000L);
AccessToken accessToken =
new AccessToken(tokenValue, new Date(expiresAtMilliseconds));
return Mono.just(accessToken);
} catch (IOException e) {
return Mono.error(e);
}
});
}
}