com.centurylink.mdw.cli.Crawl Maven / Gradle / Ivy

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MDW is a microservices based workflow framework

There is a newer version: 6.1.39

/*
 * Copyright (C) 2017 CenturyLink, Inc.
 *
 * 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 com.centurylink.mdw.cli;

import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Find mdw releases.  Supported page formats are Maven Central and
 * Tomcat Directory Listing.
 */
public class Crawl implements Operation {

    private URL url;
    private boolean withSnapshots;

    List releases;
    /**
     * @return releases sorted in ascending order
     */
    public List getReleases() {
        return releases;
    }

    public Crawl(URL url) {
        this.url = url;
    }

    public Crawl(URL url, boolean withSnapshots) {
        this.url = url;
        this.withSnapshots = withSnapshots;
    }

    public Crawl run(ProgressMonitor... progressMonitors) throws IOException {
        String page = new Fetch(url).run().getData();
        String release = withSnapshots ? "[\\d\\.]*(\\-SNAPSHOT)?" : "[\\d\\.]*";

        // try tomcat list format (internal repo)
        releases = findReleases(page, "", release, "/");
        if (releases.isEmpty()) {
            // try maven-central list format
            if (withSnapshots)
                releases = findReleases(page, " findReleases(String page, String start, String release, String end) {
        Pattern pattern = Pattern.compile(start + release + end);
        Matcher matcher = pattern.matcher(page);
        List releases = new ArrayList<>();
        while (matcher.find()) {
            String match = matcher.group();
            String rel = match.substring(start.replaceAll("\\\\", "").length(),
                    match.length() - end.replaceAll("\\\\", "").length());
            if (!releases.contains(rel) && !"..".equals(rel))
                releases.add(rel);
        }
        return releases;
    }

}