spring security SupplierJwtDecoder 源码
spring security SupplierJwtDecoder 代码
文件路径：/oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/SupplierJwtDecoder.java
/*
* Copyright 2002-2021 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.jwt;
import java.util.function.Supplier;
/**
* A {@link JwtDecoder} that lazily initializes another {@link JwtDecoder}
*
* @author Josh Cummings
* @since 5.6
*/
public final class SupplierJwtDecoder implements JwtDecoder {
private final Supplier<JwtDecoder> jwtDecoderSupplier;
private volatile JwtDecoder delegate;
public SupplierJwtDecoder(Supplier<JwtDecoder> jwtDecoderSupplier) {
this.jwtDecoderSupplier = jwtDecoderSupplier;
}
/**
* {@inheritDoc}
*/
@Override
public Jwt decode(String token) throws JwtException {
if (this.delegate == null) {
synchronized (this.jwtDecoderSupplier) {
if (this.delegate == null) {
try {
this.delegate = this.jwtDecoderSupplier.get();
}
catch (Exception ex) {
throw wrapException(ex);
}
}
}
}
return this.delegate.decode(token);
}
private JwtDecoderInitializationException wrapException(Exception ex) {
return new JwtDecoderInitializationException("Failed to lazily resolve the supplied JwtDecoder instance", ex);
}
}
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