com.adaptris.core.stubs.ExternalResourcesHelper.java Source code

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Here is the source code for com.adaptris.core.stubs.ExternalResourcesHelper.java

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/*
 * Copyright 2015 Adaptris Ltd.
 * 
 * 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.adaptris.core.stubs;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.adaptris.util.URLString;

// Helper for getting external resources; and making sure we have an inter-tubes connection.
//
public class ExternalResourcesHelper {

    public static final String DEFAULT_EXTERNAL_RESOURCE = "HEADER.html";
    public static final String EXTERNAL_SERVER = "development.adaptris.net";
    public static final String EXTERNAL_URL_PREFIX = "http://" + EXTERNAL_SERVER
            + "/installers/adapter/latest-stable/";

    private static Logger log = LoggerFactory.getLogger(ExternalResourcesHelper.class);

    private enum PortDefaults {
        http(80), https(443);

        private int myPort;

        PortDefaults(int port) {
            myPort = port;
        }

        int getPort() {
            return myPort;
        }
    }

    public static String createUrl() {
        String url = EXTERNAL_URL_PREFIX + DEFAULT_EXTERNAL_RESOURCE;
        return url;
    }

    public static boolean isExternalServerAvailable() {
        return isExternalServerAvailable(EXTERNAL_SERVER, 80);
    }

    public static boolean isExternalServerAvailable(String server, int port) {
        boolean result = false;
        try (Socket s = new Socket()) {
            // Try and get a socket to dev on port 80
            // don't give it more than a second though...
            InetSocketAddress addr = new InetSocketAddress(InetAddress.getByName(server), port);
            s.connect(addr, 1000);
            result = true;
        } catch (Exception e) {
        }
        return result;
    }

    public static boolean isExternalServerAvailable(URLString server) {
        log.debug("Checking {}", server.toString());
        int port = server.getPort();
        if (port == -1) {
            try {
                port = PortDefaults.valueOf(StringUtils.defaultIfEmpty(server.getProtocol(), "").toLowerCase())
                        .getPort();
            } catch (Exception e) {
                log.trace("No default port for {}", server.toString());
            }
        }
        return isExternalServerAvailable(server.getHost(), port);
    }

}