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PayloadMethodArgumentResolverTests.java
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PayloadMethodArgumentResolverTests.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.messaging.handler.annotation.reactive;
import java.nio.charset.StandardCharsets;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.junit.Test;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.test.StepVerifier;
import org.springframework.core.MethodParameter;
import org.springframework.core.ResolvableType;
import org.springframework.core.codec.Decoder;
import org.springframework.core.codec.StringDecoder;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DefaultDataBufferFactory;
import org.springframework.lang.Nullable;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.handler.annotation.Payload;
import org.springframework.messaging.handler.annotation.support.MethodArgumentNotValidException;
import org.springframework.messaging.handler.invocation.MethodArgumentResolutionException;
import org.springframework.messaging.handler.invocation.ResolvableMethod;
import org.springframework.messaging.support.GenericMessage;
import org.springframework.util.MimeTypeUtils;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
import org.springframework.validation.annotation.Validated;
import static org.assertj.core.api.Assertions.assertThat;
/**
* Unit tests for {@link PayloadMethodArgumentResolver}.
*
* @author Rossen Stoyanchev
*/
public class PayloadMethodArgumentResolverTests {
private final List<Decoder<?>> decoders = new ArrayList<>();
private final ResolvableMethod testMethod = ResolvableMethod.on(getClass()).named("handle").build();
@Test
public void supportsParameter() {
boolean useDefaultResolution = true;
PayloadMethodArgumentResolver resolver = createResolver(null, useDefaultResolution);
assertThat(resolver.supportsParameter(this.testMethod.annotPresent(Payload.class).arg())).isTrue();
assertThat(resolver.supportsParameter(this.testMethod.annotNotPresent(Payload.class).arg(String.class))).isTrue();
useDefaultResolution = false;
resolver = createResolver(null, useDefaultResolution);
assertThat(resolver.supportsParameter(this.testMethod.annotPresent(Payload.class).arg())).isTrue();
assertThat(resolver.supportsParameter(this.testMethod.annotNotPresent(Payload.class).arg(String.class))).isFalse();
}
@Test
public void emptyBodyWhenRequired() {
MethodParameter param = this.testMethod.arg(ResolvableType.forClassWithGenerics(Mono.class, String.class));
Mono<Object> mono = resolveValue(param, Mono.empty(), null);
StepVerifier.create(mono)
.consumeErrorWith(ex -> {
assertThat(ex.getClass()).isEqualTo(MethodArgumentResolutionException.class);
assertThat(ex.getMessage().contains("Payload content is missing")).as(ex.getMessage()).isTrue();
})
.verify();
}
@Test
public void emptyBodyWhenNotRequired() {
MethodParameter param = this.testMethod.annotPresent(Payload.class).arg();
assertThat(this.<Object>resolveValue(param, Mono.empty(), null)).isNull();
}
@Test
public void stringMono() {
String body = "foo";
MethodParameter param = this.testMethod.arg(ResolvableType.forClassWithGenerics(Mono.class, String.class));
Mono<Object> mono = resolveValue(param,
Mono.delay(Duration.ofMillis(10)).map(aLong -> toDataBuffer(body)), null);
assertThat(mono.block()).isEqualTo(body);
}
@Test
public void stringFlux() {
List<String> body = Arrays.asList("foo", "bar");
ResolvableType type = ResolvableType.forClassWithGenerics(Flux.class, String.class);
MethodParameter param = this.testMethod.arg(type);
Flux<Object> flux = resolveValue(param,
Flux.fromIterable(body).delayElements(Duration.ofMillis(10)).map(this::toDataBuffer), null);
assertThat(flux.collectList().block()).isEqualTo(body);
}
@Test
public void string() {
String body = "foo";
MethodParameter param = this.testMethod.annotNotPresent(Payload.class).arg(String.class);
Object value = resolveValue(param, Mono.just(toDataBuffer(body)), null);
assertThat(value).isEqualTo(body);
}
@Test
public void validateStringMono() {
TestValidator validator = new TestValidator();
ResolvableType type = ResolvableType.forClassWithGenerics(Mono.class, String.class);
MethodParameter param = this.testMethod.arg(type);
Mono<Object> mono = resolveValue(param, Mono.just(toDataBuffer("12345")), validator);
StepVerifier.create(mono).expectNextCount(0)
.expectError(MethodArgumentNotValidException.class).verify();
}
@Test
public void validateStringFlux() {
TestValidator validator = new TestValidator();
ResolvableType type = ResolvableType.forClassWithGenerics(Flux.class, String.class);
MethodParameter param = this.testMethod.arg(type);
Flux<DataBuffer> content = Flux.just(toDataBuffer("12345678"), toDataBuffer("12345"));
Flux<Object> flux = resolveValue(param, content, validator);
StepVerifier.create(flux)
.expectNext("12345678")
.expectError(MethodArgumentNotValidException.class)
.verify();
}
private DataBuffer toDataBuffer(String value) {
return new DefaultDataBufferFactory().wrap(value.getBytes(StandardCharsets.UTF_8));
}
@SuppressWarnings("unchecked")
@Nullable
private <T> T resolveValue(MethodParameter param, Publisher<DataBuffer> content, Validator validator) {
Message<?> message = new GenericMessage<>(content,
Collections.singletonMap(MessageHeaders.CONTENT_TYPE, MimeTypeUtils.TEXT_PLAIN));
Mono<Object> result = createResolver(validator, true).resolveArgument(param, message);
Object value = result.block(Duration.ofSeconds(5));
if (value != null) {
Class<?> expectedType = param.getParameterType();
assertThat(expectedType.isAssignableFrom(value.getClass())).as("Unexpected return value type: " + value).isTrue();
}
return (T) value;
}
private PayloadMethodArgumentResolver createResolver(@Nullable Validator validator, boolean useDefaultResolution) {
if (this.decoders.isEmpty()) {
this.decoders.add(StringDecoder.allMimeTypes());
}
List<StringDecoder> decoders = Collections.singletonList(StringDecoder.allMimeTypes());
return new PayloadMethodArgumentResolver(decoders, validator, null, useDefaultResolution) {};
}
@SuppressWarnings("unused")
private void handle(
@Validated Mono<String> valueMono,
@Validated Flux<String> valueFlux,
@Payload(required = false) String optionalValue,
String value) {
}
private static class TestValidator implements Validator {
@Override
public boolean supports(Class<?> clazz) {
return clazz.equals(String.class);
}
@Override
public void validate(@Nullable Object target, Errors errors) {
if (target instanceof String && ((String) target).length() < 8) {
errors.reject("Invalid length");
}
}
}
}