org.springframework.boot.autoconfigure.web.OnEnabledResourceChainCondition Maven / Gradle / Ivy
/*
* Copyright 2012-2020 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.boot.autoconfigure.web;
import org.springframework.boot.autoconfigure.condition.ConditionMessage;
import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
import org.springframework.boot.autoconfigure.web.WebProperties.Resources.Chain;
import org.springframework.boot.context.properties.bind.BindResult;
import org.springframework.boot.context.properties.bind.Binder;
import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.Environment;
import org.springframework.core.type.AnnotatedTypeMetadata;
import org.springframework.util.ClassUtils;
/**
* {@link Condition} that checks whether or not the Spring resource handling chain is
* enabled.
*
* @author Stephane Nicoll
* @author Phillip Webb
* @author Madhura Bhave
* @see ConditionalOnEnabledResourceChain
*/
class OnEnabledResourceChainCondition extends SpringBootCondition {
private static final String WEBJAR_ASSET_LOCATOR = "org.webjars.WebJarAssetLocator";
@Override
public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
ConfigurableEnvironment environment = (ConfigurableEnvironment) context.getEnvironment();
String prefix = determineResourcePropertiesPrefix(environment);
boolean fixed = getEnabledProperty(environment, prefix, "strategy.fixed.", false);
boolean content = getEnabledProperty(environment, prefix, "strategy.content.", false);
Boolean chain = getEnabledProperty(environment, prefix, "", null);
Boolean match = Chain.getEnabled(fixed, content, chain);
ConditionMessage.Builder message = ConditionMessage.forCondition(ConditionalOnEnabledResourceChain.class);
if (match == null) {
if (ClassUtils.isPresent(WEBJAR_ASSET_LOCATOR, getClass().getClassLoader())) {
return ConditionOutcome.match(message.found("class").items(WEBJAR_ASSET_LOCATOR));
}
return ConditionOutcome.noMatch(message.didNotFind("class").items(WEBJAR_ASSET_LOCATOR));
}
if (match) {
return ConditionOutcome.match(message.because("enabled"));
}
return ConditionOutcome.noMatch(message.because("disabled"));
}
@SuppressWarnings("deprecation")
private String determineResourcePropertiesPrefix(Environment environment) {
BindResult result = Binder.get(environment)
.bind("spring.resources", org.springframework.boot.autoconfigure.web.ResourceProperties.class);
if (result.isBound() && result.get().hasBeenCustomized()) {
return "spring.resources.chain.";
}
return "spring.web.resources.chain.";
}
private Boolean getEnabledProperty(ConfigurableEnvironment environment, String prefix, String key,
Boolean defaultValue) {
String name = prefix + key + "enabled";
return environment.getProperty(name, Boolean.class, defaultValue);
}
}