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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2015-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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 com.amazonaws.internal.http;

import java.util.Map;

import com.amazonaws.annotation.SdkInternalApi;
import com.fasterxml.jackson.databind.JsonNode;

@SdkInternalApi
public class JsonErrorCodeParser {

    /**
     * Services using AWS JSON 1.1 protocol with HTTP binding send the error code information in the
     * response headers, instead of the content. Package private for tests.
     */
    static final String X_AMZN_ERROR_TYPE = "x-amzn-ErrorType";

    private final String errorCodeFieldName;

    public JsonErrorCodeParser() {
        this(null);
    }

    public JsonErrorCodeParser(String errorCodeFieldName) {
        this.errorCodeFieldName = errorCodeFieldName == null ? "__type" : errorCodeFieldName;
    }

    /**
     * Parse the error code from the response.
     *
     * @return Error Code of exceptional response or null if it can't be determined
     */
    public String parseErrorCode(Map httpHeaders, JsonNode jsonContents) {
        String errorCodeFromHeader = parseErrorCodeFromHeader(httpHeaders);
        if (errorCodeFromHeader != null) {
            return errorCodeFromHeader;
        } else {
            return parseErrorCodeFromContents(jsonContents);
        }
    }

    /**
     * Attempt to parse the error code from the response headers. Returns null if information is not
     * present in the header.
     */
    private String parseErrorCodeFromHeader(Map httpHeaders) {
        String headerValue = httpHeaders.get(X_AMZN_ERROR_TYPE);
        if (headerValue != null) {
            int separator = headerValue.indexOf(':');
            if (separator != -1) {
                headerValue = headerValue.substring(0, separator);
            }
        }
        return headerValue;
    }

    /**
     * Attempt to parse the error code from the response content. Returns null if information is not
     * present in the content. Codes are expected to be in the form "typeName" or
     * "prefix#typeName" Examples : "AccessDeniedException", "com.amazonaws.dynamodb.v20111205#ProvisionedThroughputExceededException"
     */
    private String parseErrorCodeFromContents(JsonNode jsonContents) {
        if (jsonContents == null || !jsonContents.has(errorCodeFieldName)) {
            return null;
        }
        String code = jsonContents.findValue(errorCodeFieldName).asText();
        int separator = code.lastIndexOf("#");
        return code.substring(separator + 1);
    }
}