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/*
* Copyright 2017-2019 original 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
*
* http://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 io.micronaut.http.client.exceptions;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.naming.Described;
import io.micronaut.core.type.Argument;
import io.micronaut.http.MediaType;
import io.micronaut.http.hateoas.JsonError;
import io.micronaut.http.hateoas.VndError;
import java.util.Optional;
/**
* Strategy interface for decoding the error from a server respponse.
*
* @author graemerocher
* @since 1.0
*/
@Internal
public interface HttpClientErrorDecoder {
/**
* The default implementation.
*/
HttpClientErrorDecoder DEFAULT = new HttpClientErrorDecoder() { };
/**
* Default message decoder.
*
* @param error The error object
* @return The message
*/
default Optional<String> getMessage(Object error) {
if (error == null) {
return Optional.empty();
}
if (error instanceof JsonError) {
return Optional.ofNullable(((JsonError) error).getMessage());
} else {
if (error instanceof Described) {
return Optional.ofNullable(((Described) error).getDescription());
} else {
return Optional.of(error.toString());
}
}
}
/**
* Gets the error type for the given media type.
*
* @param mediaType The media type
* @return The error type
*/
default Argument<?> getErrorType(MediaType mediaType) {
if (mediaType.equals(MediaType.APPLICATION_JSON_TYPE)) {
return Argument.of(JsonError.class);
} else if (mediaType.equals(MediaType.APPLICATION_VND_ERROR_TYPE)) {
return Argument.of(VndError.class);
} else {
// BUG: CWE-400 Uncontrolled Resource Consumption
// return Argument.of(String.class);
// FIXED:
return Argument.STRING;
}
}
}
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