org.eclipse.packagedrone.repo.manage.system.internal.SystemServiceImpl.java Source code

Introduction

Here is the source code for org.eclipse.packagedrone.repo.manage.system.internal.SystemServiceImpl.java

Source

/*******************************************************************************
 * Copyright (c) 2015, 2016 IBH SYSTEMS GmbH.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBH SYSTEMS GmbH - initial API and implementation
 *******************************************************************************/
package org.eclipse.packagedrone.repo.manage.system.internal;

import java.io.FileReader;
import java.io.Reader;
import java.net.InetAddress;
import java.net.UnknownHostException;

import org.eclipse.packagedrone.repo.manage.system.SystemService;

import com.google.common.io.CharStreams;

public class SystemServiceImpl implements SystemService {
    private final String hostname;

    public SystemServiceImpl() {
        this.hostname = discoverHostname();
    }

    public String getHostname() {
        return this.hostname;
    }

    @Override
    public String getDefaultSitePrefix() {
        String prefix;

        prefix = System.getProperty("package.drone.site.prefix");
        if (prefix != null && !prefix.isEmpty()) {
            return prefix;
        }

        prefix = System.getenv("PACKAGE_DRONE_SITE_PREFIX");
        if (prefix != null && !prefix.isEmpty()) {
            return prefix;
        }

        prefix = makePrefixFromOsgiProperties();
        if (prefix != null) {
            return prefix;
        }

        return null;
    }

    /**
     * Make the prefix by guessing the port from the OSGi settings
     */
    protected String makePrefixFromOsgiProperties() {
        final String port = System.getProperty("org.osgi.service.http.port");
        if (port == null) {
            return null;
        }

        final StringBuilder sb = new StringBuilder();
        sb.append("http://").append(discoverHostname());
        if (!"80".equals(port)) {
            sb.append(':').append(port);
        }
        return sb.toString();
    }

    private static String discoverHostname() {
        String hostname = System.getenv("HOSTNAME");

        if (hostname == null) {
            hostname = System.getenv("COMPUTERNAME");
        }

        if (hostname == null) {
            try (Reader reader = new FileReader("/etc/hostname")) {
                hostname = CharStreams.toString(reader).trim();
            } catch (final Exception e) {
            }
        }

        if (hostname == null) {
            try {
                hostname = InetAddress.getLocalHost().getHostName();
            } catch (final UnknownHostException e) {
            }
        }

        if (hostname == null) {
            // last chance
            hostname = "localhost";
        }

        return hostname;
    }
}