DefaultResponseHandlingStrategy.java

/*
HTTP stub server written in Java with embedded Jetty

Copyright (C) 2012 Alexander Zagniotov, Isa Goksu and Eric Mrak

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package io.github.azagniotov.stubby4j.handlers.strategy.stubs;

import io.github.azagniotov.stubby4j.stubs.StubRequest;
import io.github.azagniotov.stubby4j.stubs.StubResponse;
import io.github.azagniotov.stubby4j.utils.StringUtils;
import org.eclipse.jetty.http.HttpStatus;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static io.github.azagniotov.stubby4j.utils.FileUtils.fileToBytes;
import static io.github.azagniotov.stubby4j.utils.HandlerUtils.setResponseMainHeaders;
import static io.github.azagniotov.stubby4j.utils.StringUtils.getBytesUtf8;
import static io.github.azagniotov.stubby4j.utils.StringUtils.isTokenized;
import static io.github.azagniotov.stubby4j.utils.StringUtils.replaceTokens;
import static io.github.azagniotov.stubby4j.utils.StringUtils.replaceTokensInString;

public final class DefaultResponseHandlingStrategy implements StubResponseHandlingStrategy {

    private final StubResponse stubbedResponse;

    DefaultResponseHandlingStrategy(final StubResponse stubbedResponse) {
        this.stubbedResponse = stubbedResponse;
    }

    @Override
    public void handle(final HttpServletResponse response, final StubRequest assertionStubRequest) throws Exception {
        final Map<String, String> regexGroups = assertionStubRequest.getRegexGroups();

        setResponseMainHeaders(response);
        setResponseStubbedHeaders(response, stubbedResponse, regexGroups);

        if (StringUtils.isSet(stubbedResponse.getLatency())) {
            final long latency = Long.parseLong(stubbedResponse.getLatency());
            TimeUnit.MILLISECONDS.sleep(latency);
        }
        response.setStatus(stubbedResponse.getHttpStatusCode().getCode());

        final byte[] responseBody = stubbedResponse.getResponseBodyAsBytes();
        if (stubbedResponse.isFilePathContainsTemplateTokens()) {
            final String resolvedPath = replaceTokensInString(stubbedResponse.getRawFileAbsolutePath(), regexGroups);
            final File resolvedFile = new File(resolvedPath);
            if (resolvedFile.exists()) {
                writeOutputStream(response, fileToBytes(resolvedFile));
            } else {
                response.setStatus(HttpStatus.NOT_FOUND_404);
            }
        } else if (stubbedResponse.isBodyContainsTemplateTokens()) {
            writeOutputStream(response, getBytesUtf8(replaceTokens(responseBody, regexGroups)));
        } else {
            writeOutputStream(response, responseBody);
        }
    }

    private void setResponseStubbedHeaders(final HttpServletResponse response, final StubResponse stubResponse, final Map<String, String> regexGroups) {
        for (final Map.Entry<String, String> headerPair : stubResponse.getHeaders().entrySet()) {
            String responseHeaderValue = headerPair.getValue();
            if (isTokenized(responseHeaderValue)) {
                responseHeaderValue = replaceTokensInString(headerPair.getValue(), regexGroups);
            }
            response.setHeader(headerPair.getKey(), responseHeaderValue);
        }
    }

    private void writeOutputStream(final HttpServletResponse response, final byte[] responseBody) throws IOException {
        try (final OutputStream outputStream = response.getOutputStream()) {
            outputStream.write(responseBody);
            outputStream.flush();
        }
    }
}