org.springframework.security.authorization.method.ReactiveExpressionUtils Maven / Gradle / Ivy
/*
* Copyright 2002-2022 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.authorization.method;
import reactor.core.publisher.Mono;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.EvaluationException;
import org.springframework.expression.Expression;
/**
* For internal use only, as this contract is likely to change.
*
* @author Evgeniy Cheban
* @since 5.8
*/
final class ReactiveExpressionUtils {
static Mono evaluateAsBoolean(Expression expr, EvaluationContext ctx) {
return Mono.defer(() -> {
Object value;
try {
value = expr.getValue(ctx);
}
catch (EvaluationException ex) {
return Mono.error(() -> new IllegalArgumentException(
"Failed to evaluate expression '" + expr.getExpressionString() + "'", ex));
}
if (value instanceof Boolean) {
return Mono.just((Boolean) value);
}
if (value instanceof Mono) {
Mono monoValue = (Mono) value;
// @formatter:off
return monoValue
.filter(Boolean.class::isInstance)
.map(Boolean.class::cast)
.switchIfEmpty(createInvalidReturnTypeMono(expr));
// @formatter:on
}
return createInvalidReturnTypeMono(expr);
});
}
private static Mono createInvalidReturnTypeMono(Expression expr) {
return Mono.error(() -> new IllegalStateException(
"Expression: '" + expr.getExpressionString() + "' must return boolean or Mono"));
}
private ReactiveExpressionUtils() {
}
}