org.jboss.seam.forge.shell.util.PluginUtil.java Source code

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/*
 * JBoss, by Red Hat.
 * Copyright 2011, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.seam.forge.shell.util;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.jboss.seam.forge.shell.plugins.PipeOut;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.yaml.snakeyaml.Yaml;

/**
 * @author Mike Brock .
 */
public class PluginUtil {
    public static List<PluginRef> findPlugin(String repoUrl, String searchString, PipeOut out) throws Exception {
        DefaultHttpClient client = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(repoUrl);

        out.print("Connecting to remote repository ... ");
        HttpResponse httpResponse = client.execute(httpGet);

        switch (httpResponse.getStatusLine().getStatusCode()) {
        case 200:
            out.println("found!");
            break;

        case 404:
            out.println("failed! (plugin index not found: " + repoUrl + ")");
            return Collections.emptyList();

        default:
            out.println("failed! (server returned status code: " + httpResponse.getStatusLine().getStatusCode());
            return Collections.emptyList();
        }

        Pattern pattern = Pattern.compile(GeneralUtils.pathspecToRegEx("*" + searchString + "*"));

        List<PluginRef> pluginList = new ArrayList<PluginRef>();

        Yaml yaml = new Yaml();
        for (Object o : yaml.loadAll(httpResponse.getEntity().getContent())) {
            if (o == null) {
                continue;
            }

            Map map = (Map) o;
            String name = (String) map.get("name");

            if (pattern.matcher(name).matches()) {
                pluginList.add(bindToPuginRef(map));
            }
        }

        return pluginList;
    }

    public static File downloadPlugin(final PluginRef ref, final PipeOut out, final String targetPath)
            throws Exception {
        DefaultHttpClient client = new DefaultHttpClient();

        String[] artifactParts = ref.getArtifact().split(":");

        if (artifactParts.length != 3) {
            throw new RuntimeException("malformed artifact identifier "
                    + "(format should be: <maven.group>:<maven.artifact>:<maven.version>) encountered: "
                    + ref.getArtifact());
        }

        String packageLocation = artifactParts[0].replaceAll("\\.", "/");
        String baseUrl;
        if (ref.getHomeRepo().endsWith("/")) {
            baseUrl = ref.getHomeRepo() + packageLocation + "/" + artifactParts[1] + "/" + artifactParts[2];
        } else {
            baseUrl = ref.getHomeRepo() + "/" + packageLocation + "/" + artifactParts[1] + "/" + artifactParts[2];
        }

        HttpGet httpGetManifest = new HttpGet(baseUrl + "/maven-metadata.xml");
        out.print("Retrieving artifact manifest ... ");

        HttpResponse response = client.execute(httpGetManifest);
        switch (response.getStatusLine().getStatusCode()) {
        case 200:
            out.println("done.");

            Document document = DocumentBuilderFactory.newInstance().newDocumentBuilder()
                    .parse(response.getEntity().getContent());

            XPath xpath = XPathFactory.newInstance().newXPath();
            XPathExpression checkSnapshotExpr = xpath.compile("//versioning/snapshot");
            XPathExpression findJar = xpath.compile("//snapshotVersion[extension='jar']/value");

            NodeList list = (NodeList) checkSnapshotExpr.evaluate(document, XPathConstants.NODESET);

            out.print("Reading manifest ... ");

            if (list.getLength() != 0) {

                Node n = (Node) findJar.evaluate(document, XPathConstants.NODE);

                if (n == null) {
                    out.println("failed: could not determine where to find jar file.");
                    return null;
                }

                String version = n.getFirstChild().getTextContent();

                // plugin definition points to a snapshot.
                out.println("good! (maven snapshot found): " + version);

                String fileName = artifactParts[1] + "-" + version + ".jar";

                HttpGet jarGet = new HttpGet(baseUrl + "/" + fileName);

                out.print("Downloading: " + baseUrl + "/" + fileName + " ... ");
                response = client.execute(jarGet);

                try {
                    File file = saveFile(targetPath + "/" + fileName, response.getEntity().getContent());
                    out.println("done.");
                    return file;
                } catch (IOException e) {
                    out.println("failed to download: " + e.getMessage());
                    return null;
                }

                // do download of snapshot.
            } else {
                out.println("error! (maven snapshot not found)");
                return null;
            }

        case 404:
            String requestUrl = baseUrl + "/" + artifactParts[2] + ".pom";
            httpGetManifest = new HttpGet(requestUrl);
            response = client.execute(httpGetManifest);

            if (response.getStatusLine().getStatusCode() != 200) {
                printError(response.getStatusLine().getStatusCode(), requestUrl, out);
                return null;
            } else {

                // download regular POM here.

            }
            break;
        default:
            out.println("failed! (server returned status code: " + response.getStatusLine().getStatusCode());
            return null;
        }

        return null;

    }

    private static void printError(int status, String requestUrl, PipeOut out) {
        switch (status) {
        case 404:
            out.println("failed! (file not found in repository: " + requestUrl + ")");
            break;
        default:
            out.println("failed! (server returned status code: " + status);
        }
    }

    private static File saveFile(String fileName, InputStream stream) throws IOException {
        File file = new File(fileName);
        new File(fileName.substring(0, fileName.lastIndexOf('/'))).mkdirs();

        file.createNewFile();

        OutputStream outputStream = new BufferedOutputStream(new FileOutputStream(file));

        byte[] buf = new byte[127];
        int read;
        while ((read = stream.read(buf)) != -1) {
            outputStream.write(buf, 0, read);
        }

        outputStream.flush();
        outputStream.close();

        return file;
    }

    public static void loadPluginJar(File file) throws Exception {
        ClassLoader cl = Thread.currentThread().getContextClassLoader();
        if (cl == null) {
            cl = PluginUtil.class.getClassLoader();
        }

        URLClassLoader classLoader = new URLClassLoader(new URL[] { file.toURI().toURL() }, cl);

        Thread.currentThread().setContextClassLoader(classLoader);
    }

    private static PluginRef bindToPuginRef(Map map) {
        return new PluginRef((String) map.get("name"), (String) map.get("author"), (String) map.get("description"),
                (String) map.get("artifact"), (String) map.get("homerepo"));
    }
}