org.apache.olingo.server.core.debug.DebugTabBody.java Source code

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Here is the source code for org.apache.olingo.server.core.debug.DebugTabBody.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.olingo.server.core.debug;

import java.io.IOException;
import java.io.InputStream;
import java.io.Writer;

import org.apache.commons.codec.binary.Base64;
import org.apache.olingo.commons.api.ex.ODataRuntimeException;
import org.apache.olingo.commons.api.http.HttpHeader;
import org.apache.olingo.server.api.ODataResponse;
import org.apache.olingo.server.api.deserializer.DeserializerException;
import org.apache.olingo.server.core.deserializer.FixedFormatDeserializerImpl;

import com.fasterxml.jackson.core.JsonGenerator;

/**
 * Response body debug information.
 */
public class DebugTabBody implements DebugTab {

    private enum ResponseContent {
        JSON, XML, TEXT, IMAGE
    }

    private final ODataResponse response;
    private final ResponseContent responseContent;

    public DebugTabBody(final ODataResponse response) {
        this.response = response;
        if (response != null) {
            final String contentTypeString = response.getHeader(HttpHeader.CONTENT_TYPE);
            if (contentTypeString != null) {
                if (contentTypeString.startsWith("application/json")) {
                    responseContent = ResponseContent.JSON;
                } else if (contentTypeString.startsWith("image/")) {
                    responseContent = ResponseContent.IMAGE;
                } else if (contentTypeString.contains("xml")) {
                    responseContent = ResponseContent.XML;
                } else {
                    responseContent = ResponseContent.TEXT;
                }
            } else {
                responseContent = ResponseContent.TEXT;
            }
        } else {
            responseContent = ResponseContent.TEXT;
        }
    }

    @Override
    public String getName() {
        return "Body";
    }

    //
    @Override
    public void appendJson(final JsonGenerator gen) throws IOException {
        if (response == null || response.getContent() == null) {
            gen.writeNull();
        } else {
            gen.writeString(getContentString());
        }
    }

    private String getContentString() {
        try {
            String contentString;
            switch (responseContent) {
            case IMAGE:
                contentString = Base64.encodeBase64String(streamToBytes(response.getContent()));
                break;
            case JSON:
            case XML:
            case TEXT:
            default:
                contentString = new String(streamToBytes(response.getContent()), "UTF-8");
                break;
            }
            return contentString;
        } catch (IOException e) {
            return "Could not parse Body for Debug Output";
        }
    }

    @Override
    public void appendHtml(final Writer writer) throws IOException {

        final String body = response == null || response.getContent() == null ? "ODataLibrary: No body."
                : getContentString();
        switch (responseContent) {
        case XML:
            writer.append("<pre class=\"code").append(" xml").append("\">\n");
            writer.append(DebugResponseHelperImpl.escapeHtml(body));
            writer.append("\n</pre>\n");
            break;
        case JSON:
            writer.append("<pre class=\"code").append(" json").append("\">\n");
            writer.append(DebugResponseHelperImpl.escapeHtml(body));
            writer.append("\n</pre>\n");
            break;
        case IMAGE:
            writer.append("<img src=\"data:").append(response.getHeader(HttpHeader.CONTENT_TYPE)).append(";base64,")
                    .append(body).append("\" />\n");
            break;
        case TEXT:
        default:
            writer.append("<pre class=\"code").append("\">\n");
            writer.append(DebugResponseHelperImpl.escapeHtml(body));
            writer.append("\n</pre>\n");
            break;
        }
    }

    private byte[] streamToBytes(final InputStream input) {
        if (input != null) {
            try {
                return new FixedFormatDeserializerImpl().binary(input);
            } catch (final DeserializerException e) {
                throw new ODataRuntimeException("Error on reading request content", e);
            }
        }
        return null;
    }
}