org.restheart.exchange.ByteArrayProxyResponse Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of restheart-commons Show documentation
RESTHeart Commons - Common classes for core components and plugins.
There is a newer version: 8.1.7
/*-
 * ========================LICENSE_START=================================
 * restheart-commons
 * %%
 * Copyright (C) 2019 - 2024 SoftInstigate
 * %%
 * 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.
 * =========================LICENSE_END==================================
 */
package org.restheart.exchange;

import com.google.common.reflect.TypeToken;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;
import io.undertow.connector.PooledByteBuffer;
import io.undertow.server.HttpServerExchange;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.reflect.Type;
import java.nio.ByteBuffer;
import org.restheart.utils.BuffersUtils;

/**
 *
 * @author Andrea Di Cesare {@literal }
 */
public class ByteArrayProxyResponse extends ProxyResponse {
    protected ByteArrayProxyResponse(HttpServerExchange exchange) {
        super(exchange);
    }

    public static ByteArrayProxyResponse of(HttpServerExchange exchange) {
        return new ByteArrayProxyResponse(exchange);
    }

    private static final Type _TYPE = new TypeToken(ByteArrayProxyResponse.class) {
        private static final long serialVersionUID = -6882416842030533004L;
    }.getType();

    public static Type type() {
        return _TYPE;
    }

    /**
     * @return the content as Json
     * @throws java.io.IOException
     */
    @Override
    public byte[] readContent() throws IOException {
        return BuffersUtils.toByteArray(getBuffer());
    }

    /**
     * writes the response content
     *
     * allocates the PooledByteBuffer array so close() must be invoked
     * to avoid memory leaks
     */
    @Override
    public void writeContent(byte[] content) throws IOException {
        if (content == null) {
            setBuffer(null);
        } else {
            PooledByteBuffer[] dest;
            if (isContentAvailable()) {
                dest = getBuffer();
            } else {
                dest = new PooledByteBuffer[MAX_BUFFERS];
                setBuffer(dest);
            }

            BuffersUtils.transfer(ByteBuffer.wrap(content), dest, wrapped);
        }
    }

    @Override
    protected byte[] getErrorContent(int code, String httpStatusText, String message, Throwable t, boolean includeStackTrace) throws IOException {
        var resp = new JsonObject();
        resp.add("http status code", new JsonPrimitive(code));
        resp.add("http status description", new JsonPrimitive(httpStatusText));
        if (message != null) {
            resp.add("message", new JsonPrimitive(avoidEscapedChars(message)));
        }
        var nrep = new JsonObject();
        if (t != null) {
            nrep.add("class", new JsonPrimitive(t.getClass().getName()));
            if (includeStackTrace) {
                JsonArray stackTrace = getStackTrace(t);
                if (stackTrace != null) {
                    nrep.add("stack trace", stackTrace);
                }
            }
            resp.add("exception", nrep);
        }
        return resp.toString().getBytes();
    }

    private static String avoidEscapedChars(String s) {
        return s == null ? null : s.replaceAll("\"", "'").replaceAll("\t", "  ");
    }

    private static JsonArray getStackTrace(Throwable t) {
        if (t == null || t.getStackTrace() == null) {
            return null;
        }
        var sw = new StringWriter();
        var pw = new PrintWriter(sw);
        t.printStackTrace(pw);
        var st = sw.toString();
        st = avoidEscapedChars(st);
        String[] lines = st.split("\n");
        var list = new JsonArray();
        for (var line : lines) {
            list.add(new JsonPrimitive(line));
        }
        return list;
    }
}